Decision Paper for Proposed Modifications to …...DECISION PAPER PROPOSED MODIFICATIONS TO THE...

DECISION PAPER

PROPOSED MODIFICATIONS TO THE TRANSMISSION CODE

12 AUG 2015

ENERGY MARKET AUTHORITY

991G Alexandra Road

#01-29 Singapore 119975

www.ema.gov.sg

Please direct any enquiries by e-mail to: [email protected]

Disclaimer: The information in this Consultation Paper is not to be treated by any person as any kind of advice. The Energy Market Authority shall not be liable for any damage or loss suffered as a result of the use of or reliance on the information given in this Consultation Paper.

1 Introduction

1.1. The Transmission Code sets out the rights and obligations of the Transmission

Licensee, together with the rights and obligations of users of the Transmission

System. The Transmission Code also sets out the technical requirements to be

met by those who seek to connect and operate installations on the

Transmission System.

2 Proposed modifications to the Transmission Code

2.1. Pursuant to Section 1.6 of the Transmission Code, EMA had sought feedback

on the proposed modifications to the Transmission Code to provide clarity and

updates to the technical requirements of the Transmission Code. These include

requirements relating to generating units, solar photovoltaic installations, data

and voice communications, and cable damage preventive measures.

2.2. Feedback was received from 12 parties when the consultation closed on 30

September 2014. EMA has carefully considered the feedback and our

responses are at Appendix 2.

3 EMA’s Decision

3.1. Taking into account the feedback received, EMA has decided to modify the

Transmission Code as set out in Appendix 1. The proposed modifications will

come into effect on 1st September 2015.

Appendix 1

Proposed Modifications to the Transmission Code

Modification

Ref. No. Clause Original Text Modified Text Reasons

TC/2014/1 6.11.1 The generating unit’s step-up

transformers and generating unit’s

switchboard (or switchgear) for

connecting the high voltage side of the

generating unit’s step-up transformers

and the associated switching and

protection/control equipment shall be

designed such that no single

failure/outage shall cause simultaneous

outage of two or more generating units

connected to the switchboard. All

switchboards shall be designed with one-

and-half breakers configuration, unless

the Generation Licensees submit with

justifications the use of a different

switchboard configuration for the Power

System Operator’s consideration.

The generating unit’s step-up transformers and

generating unit’s switchboard (or switchgear) for

connecting the high voltage side of the generating

unit’s step-up transformers and the associated

switching and protection/control equipment shall be

designed such that no single failure/outage shall cause

simultaneous outage of two or more generating units

connected to the switchboard. All switchboards shall

be designed in accordance with Appendix I1.4 with

one-and-half breakers configuration, unless the

Generation Licensees submit with justifications the

use of a different switchboard configuration for the

Power System Operator’s consideration.

To align with the current Code

requirements as set forth in

Appendix I1.4.

TC/2014/2 6.11.2(b) All generating units shall be designed such

that:

the generating station has Black Start

Capability unless exempted by Power

System Operator;

All generating units shall be designed such that:

each generating station with any generating unit(s) of

rated capacity 100MW and above is required to have

Black Start Capability the generating station has Black

Start Capability unless exempted by Power System

Operator;

To exempt generating stations with

generating unit(s) of rated capacity

below 100MW from the

requirement to have Black Start

Capability as such generating

stations have limited capability to

energize the network during a

black start condition.

Modification


TC/2014/3 6.12.3 The Transmission Licensee and

Generation Licensee shall provide all the

equipment at their respective site,

including the communication equipment.

The Transmission Licensee shall provide

data communication lines from the

control centers of the Power System

Operator to the transmission substation

and power station switchhouses as

specified by the Power System Operator

for the purposes of real-time power

system monitoring and control. All the

equipment at the site shall be equipped

with battery backup of at least 4-hour

operation time. In addition, the AC power

shall also be backed up by the standby

generator at the site, if the site is

equipped with such a facility.

The Transmission Licensee and Generation Licensee

shall provide all the equipment at their respective site,

including the communication equipment. The

Transmission Licensee shall provide data

communication lines from the computer room in the

control centers of the Power System Operator to the

transmission substation and power station generating

station switchhouses as specified by the Power System

Operator for the purposes of real-time power system

monitoring and control. The Generation Licensee shall

be responsible for the data communication lines from

the Generation Licensee’s equipment to the

Transmission Licensee's termination box located in the

generating station’s switchhouse. The termination

box, which shall be provided by the Transmission

Licensee, shall also be used for termination of the

Transmission Licensee’s data communication lines. In

the event of relocation of the termination box or

diversion of the data communications lines, the

Licensee that initiates the relocation or diversion shall

bear all the costs necessary for the relocation or

diversion including the costs incurred by any other

affected Licensee to divert the data communication

lines at the affected Licensee’s end caused by the

relocation or diversion. All the equipment at the site

shall be equipped with battery backup of at least 4-

hour operation time. In addition, the AC power shall

also be backed up by the standby generator at the

site, if the site is equipped with such a facility.

To provide clarity on the division of

responsibility between the

Transmission Licensee and the

Generation Licensee for the

communication lines.

Modification


TC/2014/4 6.12.7 (new) New Clause Owners of solar photovoltaic installations with an

installed capacity of 100 kWac or above at each

site/facility which is connected to the grid, shall

provide the Power System Operator with the following

signals which are sampled and transmitted at 1 minute

intervals. Detailed requirement shall be provided by

the Power System Operator upon request.

• Active Power (gross) at the AC-side of the solar

photovoltaic installation.

To facilitate the monitoring of

power output from solar

photovoltaic installations with an

installed capacity of 100kWac or

above, and ensure that there is

sufficient reserve capacity available

in the system to respond to sudden

fluctuations in solar PV output so

as to maintain power system

security and reliability.

TC/2014/5 8.4.2 New Clause. 8.4.2 The Generation Licensee shall ensure that its

generation facilities and generating station premises

have adequate protection and preventive measures

against lightning strike and fire, and comply with the

requirements of IEC, BS, SS, or other equivalent

international standards.

To ensure that generation facilities

and generating station premises

are protected against fire and

lightning strikes which affect the

operation of generating units. This

is to ensure the reliability and

availability of generating units so

as to maintain power system


TC/2014/6 9.4 New Section 9.4 Cable Damage Preventive Measures

9.4.1 The Generation Licensee shall implement

measures to ensure that electricity cables belonging to

the Transmission Licensee, which are laid in the

generating station premises, are protected from

damage by any earthworks carried out in the

premises, including but not limited to the following:

To ensure that Transmission

Licensee’s electricity cables in

generating station premises are

protected from damage by

earthworks so as to ensure power

system security and reliability.

Modification


(a) providing clear markings of 400kV, 230kV and

66kV cables routes within the generating

station premises;

(b) establishing a standard operating procedure

(“SOP”) for earthworks carried out within

generating station premises in compliance

with the cable damage prevention provisions

in the Electricity Act; and

(c) implementing, as part of the SOP, a Permit-

to-Work (“PTW”) system to ensure that

contractors seek the Generation Licensee’s

approval before they commence earthworks.

9.4.2 The Transmission Licensee shall keep up-to-date

digital mapping or records of their high voltage cables

installed in and under public places, in such form as is

accessible by other utilities service providers or such

other persons who require such information for

locating the high voltage cables prior to

commencement of earthworks.

TC/2014/7 C1.3 (d) C1.3 Generating unit performance

parameters

(d) Generating unit step-up transformer

• Rated MVA Capacity ______ MVA

• Rated voltage

C1.3 Generating unit performance parameters (d)

Generating unit step-up transformer

• Rated MVA Capacity ______ MVA

• Rated voltage

− Primary ______ kV

The requested information is

required for a connection applicant

to demonstrate to the

Transmission Licensee and the

Power System Operator that the

applicant’s proposed installation

meets the Transmission Code

requirements.

Modification


− Primary ______ kV

− Secondary ______ kV

• Nominal voltage ratio,

primary/secondary ______

• Positive sequence impedance at

− Maximum tap ______ %

− Minimum tap ______ %

− Nominal tap ______ %

• Zero phase sequence impedance

______ %

• Tap changer range + ______ %

- ______ %

• Tap changer step size ______ %

• Tap changer type on load / off load

• Winding connection and Vector

Group ______

• Magnetising curve

• Earthing resistor of transformer (if

any)

− At Primary side ______

− At Secondary side ______

− Secondary ______ kV

• Nominal voltage ratio, primary/secondary ______

• Positive sequence impedance at

− Maximum tap ______ %

− Minimum tap ______ %

− Nominal tap ______ %

• Zero phase sequence impedance ______ %

• Tap changer range + ______ %

- ______ %

• Tap changer step size ______ %

• Tap changer type on load / off load

• Winding connection and Vector Group ______

• Magnetising curve

• Earthing resistor of transformer (if any)

− At Primary side ______

− At Secondary side ______

• Report on predicted transformer energisation

performance including electromagnetic transient

studies unless otherwise agreed with the PSO.

Modification


TC/2014/8 C1.3 (h) Generating unit performance parameters

(h) Gas Turbine Units (Open Cycle and

Closed Cycle)

• Rated MW Capacity

• Performance data and curves:

− Power vs. Fuel Consumption

− Exhaust Temperature vs. Fuel

Consumption

− Power vs. Ambient Temperature

− Power vs. Speed

− Inlet Guide Vane effects

• Control design

− Functional description and block

diagram showing transfer

function of individual element of

gas turbines units (including

effect of Ambient Temperature)

in PSSE format

• Test data/report:

− Load rejection tests

− Frequency response tests

Generating unit performance parameters

(h) Gas Turbine Units (Open Cycle and Closed Cycle)

• Rated MW Capacity

• Performance data and curves:

− Power vs. Fuel Consumption

− Exhaust Temperature vs. Fuel Consumption

− Power vs. Ambient Temperature

− Power vs. Speed

− Inlet Guide Vane effects

• Control design

− Functional description and block diagram

showing transfer function of individual

element of gas turbines units (including effect

of Ambient Temperature). The model is to be

submitted in both PSSE source code (i.e. flecs

code) format and MATLAB Simulink format.

• Test data/report:

− Load rejection tests

− Frequency response tests

To provide clarity on the format of

the information to be provided,

which shall apply to all new or

repowered generating units.

Modification


TC/2014/9 C4.1 (j) (j) Power System Stabilizer (PSS)

For each generating unit with Rated MW

Capacity at or above 60MW, a PSS shall be

incorporated to provide additional

damping of power oscillations. Proper

operation of the PSS shall be confirmed by

test. The preferred input signal for the PSS

is accelerating power which can be

synthesized from measured electrical

power and speed. PSS transducers (i.e. for

measuring input signals) shall be linear

over their operational range and its time

constant shall not exceed 100

milliseconds. Power System Operator shall

make available the system characteristic

to Generation Licensees for tuning of PSS.

Generation Licensees shall submit a report

incorporating the methodology in deriving

the setting of the PSS parameters, as well

as the tuning techniques, to PSO for

review before implementation on site.

(j) Power System Stabilizer (PSS)

For each generating unit with Rated MW Capacity at

or above 60MW, a PSS shall be incorporated to

provide additional damping of power oscillations.

Proper operation of the PSS shall be confirmed by test.

The preferred input signal for the PSS shall have dual

inputs, namely is accelerating power which can be

synthesized from measured electrical power and

speed. PSS transducers (i.e. for measuring input

signals) shall be linear over their operational range

and its time constant shall not exceed 100

milliseconds. Power System Operator shall make

available the system characteristic to Generation

Licensees for tuning of PSS. Generation Licensees shall

submit a report incorporating the methodology in

deriving the setting of the PSS parameters, as well as

the tuning techniques, to PSO for review before

implementation on site.

To align with the current practice

of using dual-input PSS which

offers better transient

performance than single-input PSS.

Modification


TC/2014/10 F2.1 F2.1 Voltage Fluctuation

(a) Connected person shall ensure that the

operation of their installations shall not

cause voltage fluctuation at a point of

common coupling to exceed 3% of the

nominal voltage for step changes.

(b) The planning limits for voltage

fluctuation caused by connected person,

e.g. owner of an arc furnace, shall be in

accordance with the requirements set out

in Engineering Recommendation P28 of

UK.

F2.1 Voltage Fluctuation

(a) Connected person shall ensure that the operation

of their installations shall not cause voltage fluctuation

at a point of common coupling to exceed 3% of the

nominal voltage for step changes.

(a) Connected person shall ensure that the operation

of their installations shall not cause voltage fluctuation

at a point of common coupling to exceed 3% of the

nominal voltage for step changes, with the exception

of the energisation of transformers and series reactors

connected to the transmission network, which shall

not cause voltage fluctuation at a point of common

coupling to exceed 5% of the nominal voltage.

(b) The Transmission Licensee shall ensure that the

energisation of transformers and series reactors

connected to the transmission network shall not cause

voltage fluctuation at a point of common coupling to

exceed 5% of the nominal voltage. Unless otherwise

agreed with the PSO, the Transmission Licensee shall

provide a report on predicted equipment energisation

performance whenever a new type of power

equipment is introduced or there are changes in the

specifications of existing type of power equipment.

This report shall include electromagnetic transient

studies.

(c) The planning limits for voltage fluctuation caused

by connected person, e.g. owner of an arc furnace,

shall be in accordance with the requirements set out

in Engineering Recommendation P28 of UK.

To incorporate the limit for voltage

fluctuations due to energisation of

cables, transformers and

shunt/series reactors. The limit is

set with reference to IEC/TR 61000-

3-7:2008.

Modification


TC/2014/11 F4.3 New

The Generation Licensee, with Generation Registered

Facility at point of connection of 66kV voltage and

above, shall provide compatible voice communication

equipment located in the Generation Licensee's

generation facility control room which shall be

connected to the Transmission Licensee's voice

communication system. The Generation Licensee shall

be responsible for the communication lines from the

Generation Licensee's generation facility control room

to the Transmission Licensee's termination box that

connects to the Transmission Licensee's voice

communication system. The termination box shall be

provided by the Transmission Licensee and shall be

located in the generating station switchhouse. In the

event of relocation of the termination box or diversion

of the communications lines, the Licensee that

initiates the relocation or diversion shall bear all the

costs necessary for the relocation or diversion

including the costs incurred by any other affected

Licensee to divert the communication lines at the

affected Licensee’s end caused by the relocation or

diversion.

To enhance the resilience of the

voice communication system in the

power sector.

TC/2014/12 H2.1(b) An AGC station shall have a dedicated RTU

with the condition that the RTU shall not

be controlling more than 4 generating

units or a total of more than 1000MW.

Should the number of generating units or

total generating capacity exceed this, then

a second RTU shall be provided.

An AGC station A generating station shall have a

dedicated RTU with the condition that the RTU shall

not be controlling more than 4 generating units or a

total of more than 1000MW. Should the number of

generating units or total generating capacity exceed

this, then a second RTU shall be provided.

To align with the definition of

“generating station” in the

Transmission Code.

Modification


TC/2014/13 H3.1 Communications between the remote

terminal equipment and the EMS shall be

through 2-wire telephone line or pilot

wire. The equipment shall communicate

using V.34 analog lease-line modems or

X.27 optical modems. The modems at the

EMS will operate as originator while the

remote terminal equipment modems will

operate as answerer.

Communications between the remote terminal

equipment located at the Transmission Licensee’s

substation and/or the connected person’s intake

substation/switchhouse and the EMS shall be through

2-wire telephone line or pilot wire or optical fibre data

communication lines provided by the Transmission

Licensee and at least one of which shall be a pilot wire

communication line. The equipment shall

communicate using V.34 analog lease-line modems or

X.27 optical modems. The modems at the EMS will

operate as originator while the remote terminal

equipment modems will operate as answerer.

To enhance the security and

reliability of the communication

system in the electricity network by

using independent data

communication lines (which are to

be provided by the Transmission

Licensee) instead of the public

communication network.

TC/2014/14 H3.3

It is the responsibility of the Transmission

Licensee and Generation Licensee to

provide all the equipment at the remote

site including the communication

equipment and the communication line

up to the surge arrestor located at the

PSO control centres.

It is the responsibility of the Transmission Licensee

and Generation Licensee to provide all the equipment

at the remote site including the communication

equipment and the communication line up to the

surge arrestor located at the PSO control centres. The

communication equipment shall include encryption

devices to ensure secure communication on the

communication lines. These encryption devices shall

be of the same make and model as the devices

installed at the PSO control centres.


of deploying encryption devices in

communication lines so as to

protect against cyber-security and

ensure power system security.

Modification


TC/2014/15 H4.1 Substation and Switchhouse

The following measurements shall be provided:

(f) Transformer taps (with the exception of 66/22

kV transformers); and

(g) Solar global irradiance (applicable only to

Transmission Licensee) that comply with the

following minimum specifications. Transmission

Licensee shall seek advice from the Power

System Operator on the location of the

transmission substation(s) for installation of

Solar global irradiance measurement.

• Irradiance range: 0 – 2000Wm-2

or better

• Accuracy of direct output: >90% for clear sky

• Directional response (for beam irradiance): +/-

20Wm2

• Response time to reach 95% response: < 30

seconds; and

(h) Other quantities, as required.

To facilitate the collation and

monitoring of solar photovoltaic

weather data for the planning and

enhancement (if required) of the

electricity network to ensure the

grid readiness to support greater

deployment of solar photovoltaic

systems.

TC/2014/16 H4.2 AGC Station

AGC Station Generating station Consequential change to align with

the proposed change in Appendix

H2.1 (b) above.

Modification


TC/2014/17 H4.2 (d) The status of the following equipment

shall be provided:

New

The status of the following equipment shall be

provided:

(d) Status of frequency response switch


of monitoring the status of

frequency response switch.

TC/2014/18 H4.2 (e)

Renumber

from existing

H4.2 (d)

H4.2 (d)

Emergency Shutdown Valve (ESDV) and

the status of all valves on the Onshore

Receiving Facility (ORF) and natural gas

transmission pipeline supplying natural

gas to the generation facility.

H4.2 (d) (e)

Emergency Shutdown Valve (ESDV) and the status of

all valves on the Onshore Receiving Facility (ORF) and

natural gas transmission pipeline supplying natural gas

to the generation facility.

Consequential change due to the

proposed change to Appendix H4.2

(d) above.

TC/2014/19 H4.2 (f)

Renumber

from existing

H4.2 (e)

H4.2 (e)

Pressure and gas flow at ORF and natural

gas transmission pipeline supplying

natural gas to the generation facility.

H4.2 (e) (f)

Pressure and gas flow at ORF and natural gas

transmission pipeline supplying natural gas to the

generation facility.



(d) above.

TC/2014/20 H4.2 (g) New H4.2 (g)

For a combined-cycle plant or gas turbine, the ambient

temperature and the hot switch activation signal when

fuel changeover is initiated, manually or automatically,

from natural gas to its alternate fuel and the fuel type

used.


of monitoring the ambient

temperature and hotswitch

activation signal for all combined-

cycle plants and gas turbines.

Modification


TC/2014/21 H4.2 (h)

Renumber

from existing

H4.2 (f)

H4.2 (f)

Other quantities, as required.

H4.2(f) (h)

Other quantities, as required



(d) above.

TC/2014/22 H6 (i) New Status and measurements sent to the EMS shall be

flagged as “not topical” by the RTU whenever there is

a failure in the instrument or system providing the

status or measurements to the RTU.


of flagging status and

measurements as “not topical”

when there is a failure in the

instrument or system providing the

status or measurements to the

RTU.

TC/2014/23 H8 (d) Compliance table with the IEC 870-5-101

Interoperability List (Appendix H10)

Compliance table with the IEC 870-5-101

Interoperability List (Appendix H10) as stated in the

System Operation Manual.

Detailed information on

interoperability is described in the


TC/2014/24 H8 (e) IEC 870-5-101 Protocol Information Object

Address Assignments (Appendix H11)

IEC 870-5-101 Protocol Information Object Address

Assignments (Appendix H11) as stated in the System

Operation Manual.

Detailed information on protocol

information object address

assignments is described in the


Modification


TC/2014/25 H10 IEC 870-5-101 Interoperability List IEC 870-5-101 Interoperability List Appendix H10 is no longer needed

as detailed information on

interoperability is described in the


TC/2014/26 H11 IEC 870-5-101 Protocol Information Object

Address Assignments

IEC 870-5-101 Protocol Information Object Address

Assignments

Appendix H11 is no longer needed

as information on protocol

information object address

assignments is described in the


TC/2014/27 Appendix I2 See details in Table below See details in Table below To update the standards for

switchgears, transformers and

cables.

Updates to Switchgear, Transformers and Cable Standards

Clause Items Original Standard Updated Standard

Appendix I2.1:

Switchgear

Switchgear IEC 60298

IEC 60694

IEC 60298 IEC 62271-200

IEC 60694 IEC 62271-1

Circuit Breakers

IEC 62271-100

BS 5311

IEC 62271-100

BS 5311 BS EN 62271-100

AC Disconnectors

(Isolators)

IEC 62271-102

BS 5253

IEC 62271-102

BS 5253 BS EN 62271-102

Current Transformers

IEC 60044

BS 7626

BS 3938

SS318

IEC 60044 IEC 61869

BS 7626 BS EN 61869

BS 3938

SS318

Voltage Transformers

IEC 60186

IEC 60044

BS 7625

BS 3941

IEC 60186 IEC 61869

IEC 60044

BS 7625 BS EN 61869

BS 3941

Instrument

Transformers

IEC 60044-6 IEC 60044-6 IEC 61869-1

IEC 61869-2

Bushings IEC 60137

BS 223

IEC 60137

BS 223 BS EN 60137

Relays

IEC 60255

BS 5992

IEC 60255

BS 5992

BS EN 61810-1

BS EN 61810-2


Instruments BS 89 BS 89

BS EN 60051-1

Earthing

IEC 62271-102

CP 1013

SS CP 16

IEC 62271-102

CP 1013 BS 7430

SS CP 16 SS 551

Motors

BS 2613

BS 5000 Part II

BS 3979

BS 2613

BS 5000 Part II BS EN 60034

BS 3979 BS 60079-1

Control Gear

IEC 60694

IEC 60298

BS 5424 Part I

IEC 60694 IEC 62271-1

IEC 60298 IEC 62271-200

BS 5424 Part I BS EN 60947-4-1

Wires and Wiring

IEC 60332 Part I

BS 6231

IEC 60332 Part 1 IEC 60332-1-1

IEC 60332-1-2

BS 6231

Inductive Load Switching IEC 61233 IEC 61233 IEC 62271-110

Sulphur Hexafluoride

(SF6)

IEC 60376

BS 5207

BS 5209

IEC 60376

BS 5207 BS EN 60376

BS 5209 BS EN 60480

High Voltage Test

Techniques

IEC 60517

BS 923

IEC 60517 IEC 62271-203

BS 923 BS EN 60060-1

Cable Connections IEC 60859 IEC 60859 IEC 62271-209


Enclosures

IEC 60517

IEC 60529

CENELEC EN50 052

CENELEC EN50 064

CENELEC EN50 068

CENELEC EN50 069

IEC 60517 IEC 62271-203

IEC 60529

CENELEC EN50 052

CENELEC EN50 064

CENELEC EN50 068

CENELEC EN50 069

Sound Level Meter IEC 60651 IEC 60651 IEC 61672

Appendix I2.2:

Transformers

Transformers

IEC 60076

IEC 60722

IEC 60354

SS 404

IEC 60076

IEC 60722

IEC 60354

SS 404

Power Transformers IEC 60076

BS 171

IEC 60076

BS 171

Transformer Oil BS 148

BS 5730

BS 148

BS EN 60296

BS 5730 BS EN 60422

Tap Changers BS 4571 BS 4571 BS EN 60214-1

High Voltage Test

Technique

IEC 60060

BS 923

IEC 60060

BS 923 BS EN 60060-1

Precision Sound Level

Meters IEC 60651 IEC 60651 IEC 61672

Earthing SS CP16 SS CP16 SS 551

Motor BS 2613 BS 2613 BS EN 60034

High Voltage Bushings BS 223 BS 223 BS EN 60137


Current Transformers

BS 7626

BS 3938

SS 318

BS 7626

BS 3938 BS EN 61869

SS 318 IEC 61869

Appendix I2.3:

Cables

XLPE insulation power

cables for rated voltages

of up to 600/1000V

SS 324 SS 324 SS 443

IEC 60502-1

Tests for power cables

with extruded insulation

IEC 60840

IEC 60502

IEC 60840

IEC 60502

IEC 62067

Cable Connections IEC 60859 IEC 60859 IEC 62271-209

Appendix 2

EMA’s Response to Public/Industry Feedback EMA’s Response to Public/Industry Feedback

Modification

Ref. No. Clause Public/Industry Comments EMA’s Response

TC/2014/3 6.12.3 MSD International GmbH

(Singapore Branch)

30s real time reporting to PSO, Tuas Power to

confirm?

There is no requirement for 30 sec real-time reporting to the

Power System Operator’s (PSO) Energy Management System

(EMS) under clause 6.12.3 of the Transmission Code. Clause

6.12.3 is only applicable to Generation Licensees and the

Transmission Licensee. Real-Time monitoring requirements for

Intermittent Generation Sources are specified in System

Operation Manual. An extract of the requirements is appended

below:-

Real-Time Monitoring System Overview

The Market Participants shall make provision to provide to PSO

the following signals with a sampling rate of 1 minute:

i) For each Intermittent Generation Facility,

Active power ;and

Other measurements or status as required by PSO.

The above information shall be submitted to the PSO in real-

time every 1 minute. The information shall be organised in an

ASCII Monitoring Data File (MDF) and submitted over the

Internet using the secured FTP protocol.

Modification


Singapore Power Limited We propose that the clause be amended as

shown below (in red) to provide clarity on the

Transmission Licensee responsibility:

The Transmission Licensee and Generation

Licensee shall provide all the equipment at their

respective site, including the communication

equipment. The Transmission Licensee shall

provide data communication lines from the

communication room of Transmission Licensee

the computer room in / near the control centers

of the Power System Operator to the

transmission substation and power station

generating station switchhouses as specified by

the Power System Operator for the purposes of

real-time power system monitoring and control.

We propose that the clause be amended as

shown below (in red) to ensure that parties only

pay for the costs for the portion that they are

responsible for:

The Generation Licensee shall be responsible for

the data communication lines from the

Generation Licensee’s equipment to a

termination box located in the generating

station’s switchhouse. The termination box,

which shall be provided by the Transmission

Licensee, shall also be used for termination of

the Transmission Licensee’s data communication

EMA disagrees with SPPG's proposed changes to clause 6.12.3.

The Transmission Licensee shall provide data communication

lines from the PSO’s computer room to the transmission

substations and generating station switchhouses, and this

includes the portion from the PSO’s computer room and the

Transmission Licensee’s communication room. This is aligned

with the current arrangement. An example is the data

communication lines at Labrador Backup Control Centre (BCC)

which is owned by the Transmission Licensee.

It is inequitable for a party to bear the relocation or diversion

costs, even for the portion that he is responsible for, if the

relocation of the termination box or diversion of the data

communication lines is not initiated by him. The party that

initiates the relocation or diversion shall instead bear all the

necessary costs. This is based on a causer-pay principle.

Modification


lines. In the event of relocation of the

termination box or diversion of the data

communications lines, the Licensee that initiates

the relocation or diversion shall bear its own all

the costs necessary for the relocation or

diversion while including the costs incurred by

any other affected Licensee shall bear its own

costs to divert the data communication lines at

the affected Licensee’s end caused by the

relocation or diversion. All the equipment at the

site shall be equipped with battery backup of at

least 4-hour operation time. In addition, the AC

power shall also be backed up by the standby

generator at the site, if the site is equipped with

such a facility.

TC/2014/4 6.12.7

(new)

SolarGy Pte Ltd Please see attached typical schematic at an elect

distribution network for a building with 22kV

intake.

For clarity, please confirm where should be the

solar power meters. Is it at (A) and (C) or (A) and

(D)?

Based on the schematic submitted, (A) shall be the monitoring

point. However, as the setup for each installation varies, a solar

PV connection applicant can submit its proposal to the PSO for

discussion prior to implementation.

Modification


Tuas Power Generation

Pte Ltd

The provision of the required signals at 1 minute

interval to the Power System Operator should

not apply to owners (e.g. Generation Licensee)

who install the solar photovoltaic for its own

internal use and it is not connected to the grid

for export.

The requirement shall apply to solar PVs that are connected to

the grid regardless whether the electricity generated from the

solar PVs is for internal consumption or export to the grid. This

is to facilitate the monitoring of power output from solar

photovoltaic installations with an installed capacity of 100kWac

or above, and ensure that there is sufficient reserve capacity

available in the system to respond to sudden fluctuations in

solar PV output, so as to maintain power system security and

reliability.

For clarity, EMA has revised the clause as follows:

“Owners of solar photovoltaic installations with an installed

capacity of 100 kWac or above at each site/facility which is

connected to the grid, shall provide the Power System

Operator with the following signals which is sampled and

transmitted at 1 minute intervals. Detailed requirement shall

be provided by the Power System Operator upon request.”

Modification


Phoenix Solar Pte Ltd With reference to TC/2014/4, proposed new

clause 6.12.7 on PSO metering for PV systems

with capacities of 100kWac or above, please see

our attached feedback.

The feedback covers not only PSO metering but

also revenue metering requirements for PV

systems with wholesale generation licences and

smaller systems belonging to contestable

consumers who wish to sell excess PV

production. The two metering topics are closely

related and share the problem of

disproportionate cost.

I am attaching our feedback both as pdf for

record keeping and as word document to simplify

copying text into other documents.

With the increasing connection of solar PV systems to the

electricity grid in Singapore, the PSO will need to manage the

intermittent nature of such sources to ensure that the security

and reliability of the power system is not compromised. The

monitoring of the power output from solar PV systems is

necessary to ensure that there is sufficient reserve capacity in

the grid to respond to sudden fluctuations in solar PV output.

Nevertheless, EMA has reviewed the industry feedback, and

reduced the monitoring requirement to only the active power

(gross) at the AC-side of the solar photovoltaic installation.

Additionally, the monitoring timeframe shall be shortened to

6am to 8pm daily.

On the metering requirements, EMA is reviewing it separately

as part of a wider review on the new pricing mechanism for

intermittent generation sources.

Singapore Power Limited For completeness, EMA may wish to include the

provision of communication media for

transmitting the metering data to the Power

System Operator under the scope of the owner.

Solar PV owner can transmit the metering data via secure ftp

internet. The details are specified in the System Operation

Manual.

Modification


Senoko Energy We would like to clarify whether the signals to

PSO are required for Solar installations that off-

set internal consumption from a load facility (i.e.,

the Solar installations are not connected to the

grid).

The requirement shall apply to solar PVs that are connected to

the grid regardless whether the electricity generated from the

solar PVs is for internal consumption or for export to the grid.


“Owners of solar photovoltaic installations with an installed

capacity of 100 kWac or above at each site/facility which is

connected to the grid, shall provide the Power System

Operator with the following signals which are sampled and

transmitted at 1 minute intervals. Detailed requirement shall

be provided by the Power System Operator upon request.”

Modification


TC/2014/6 9.4 Tuas Power Generation

Pte Ltd

Transmission Licensee shall be responsible to

implement 9.4.1 (a) for cables belonging to

Transmission Licensee laid in the Generation

Licensee premises.

The Transmission Licensee shall follow the ‘SOP’

for earthwork and the ‘PTW’ system

implemented in the Generation Licensee

premises.

The Transmission Licensees shall also keep up-to-

date digital mapping or records of their high

voltage cables installed in the Generation

Licensee premises.

Earthworks carried out in the generating station premises are

under the control of the Generation Licensees. As such, it is the

responsibility of the Generation Licensees to implement

measures including establishing a standard operating

procedure and Permit-to-Work system to ensure that the

Transmission Licensees’ cables in the Generation Licensee’s

premises are protected from damage by any earthworks

carried out in the premises. This is to ensure power system


YTL PowerSeraya Pte.

Limited

Section 9.4.1(c) should not be applicable to

Transmission Licensee's contractors working

inside the Generation Licensee's premises as the

PTW for the work should be issued by the

Transmission Licensee after consent is given by

the Generation Licensee.










Modification


Senoko Energy We propose that it should be the TL’s

responsibility to protect its own asset. From the

design stage when TL intends to lay its electricity

cables in the generating station premises, TL

must in consultation with GL provide clear

markings and adequate protection of 400kV,

230kV and 66kV cables routes within the

generating station premises at their own cost.










TC/2014/7 C1.3 (d) YTL PowerSeraya Pte.

Limited

“Report on predicted transformer energisation

performance including electromagnetic transient

studies and detailed model in PSCAD" should be

applicable to new planting only

The requirement is applicable to new generating unit step-up

transformers as well as modification to existing generating unit

step-up transformers.

Modification


Keppel Infrastructure

Holdings Pte Ltd

What is PSCAD? PSCAD is an engineering simulation software tool for

performing and analysing switching transient studies.

ExxonMobil Asia Pacific

Pte Ltd

We would like to seek clarification on the

following :

(a) Whether there are any other software that

can be used besides PSCAD

(c) Whether this is applied to all step up

transformer regardless of size

(a) PSCAD is an engineering simulation software tool for

performing and analysing switching transient studies and it is

also widely used in the industry. However, we noted the

comments and have amended the Code accordingly as follows:

“Report on predicted transformer energisation performance

including electromagnetic transient studies unless otherwise

agreed with the PSO.”

(c) The step-up transformer data listed in Section C1.3 (d) is

required for all generating units.

TC/2014/8 C1.3 (h) ExxonMobil Asia Pacific

Pte Ltd

ExxonMobil would like to understand the reasons

for the said reporting to be provided in both

formats. If there are no limitations to providing

the information in the PSSE format, we

recommend that the MATLAB Simulink format be

as an alternative option, rather than an

additional requirement. I.e., the amended text

would read “……The model is to be submitted in

either both PSSE source code (i.e. flecs code)

format or and MATLAB Simulink format.”

The PSSE model is for integrated power system studies while

the MATLAB Simulink model serves the purpose of assessing

individual generating unit performance.

Modification


TC/2014/9 C4.1 (j) YTL PowerSeraya Pte.

Limited

This clause should not be applicable to existing

generating units.

The requirement is applicable to new power system stabilizers

and modification to existing power system stabilizers.

TC/2014/10 F2.1 Quality Power

Management Pte Ltd

For clarity and completeness of the Code, the

limits should be specified clearly, and not be

referenced to another standard like the U.K ER

P28. Furthermore the ER P28 is undergoing

review at the moment, so limits stated in the

existing (1989) version could very well be

changed after review, causing further confusion,

as to what the limits should be. Since a

modification of this statement is due, it will be

good to make this clear; with limits specified.

EMA’s proposed amendment is for clause F2.1 (a) and not F2.1

(b). Nevertheless, we note your comments to clause F2.1 (b).

EMA has assessed that it would be prudent to make reference

to Engineering Recommendation P28 of UK as opposed to

specifying the limits in clause F2.1 (b), so as to cover any

changes and updates to the Engineering Recommendation P28

of UK.

Modification


Singapore Power Limited Clause F2.1 states the voltage fluctuation

requirement during daily operation.

We are of the view that less frequent events i.e.

the energisation of cables, transformers and

shunt/series reactors connected to the

transmission network under IEC/TR 61000- 3-

7:2008 need not be included.

Clause F2.1 is not restricted to daily switching operations.

The energisation of cables, transformers and shunt/series

reactors do affect Singapore transmission system. The upper

limit of the 3-5% requirement in IEC/TR 61000-3-7:2008, i.e.

5%, is adopted for such non-frequent switching events.

To amend the following for alignment with requirements to :

“(b) The Transmission Licensee shall ensure that the

energisation of transformers and series reactors connected to

the transmission network shall not cause voltage fluctuation at

a point of common coupling to exceed 5% of the nominal

voltage. Unless otherwise agreed with the PSO, the

Transmission Licensee shall provide a report on predicted

equipment energisation performance whenever a new type of

power equipment is introduced or there are changes in the

specifications of existing type of power equipment. This report

shall include electromagnetic transient studies.”

Modification



Pte Ltd We would like to seek clarification on the

following :

(b) The allowable transient voltage drop (%) at

PCC.

The voltage fluctuation shall not exceed 5% of the nominal

voltage at the point of common coupling, as specified in the

proposed modification to Section F2.1 (a) (TC/2014/10).

TC/2014/11 F4.3 Tuas Power Generation

Pte Ltd

At present, there are five (5) communication

means between PSO control centres and

Generation Licensees to ensure effective

communication.

1. Grid –Com Radio Set

2. Hot line to Power System Control Centre of

EMA

3. Hot line to Backup Control Centre of EMA

4. Normal telephone line

5. Fax machine through Singtel line

Our view is that the above five communication

means are adequate and have worked well over

the past years, and the new communication

requirement is unnecessary. The new

requirement would entail additional costs for the

Generation Licensee.

In addition, we are of the view that the

Generation Licensee’s voice communication

equipment connected to the Transmission

Licensee’s voice communication system

termination box could also be located in the

The Transmission Licensee's VoIP is a separate communication

infrastructure, owned and operated by the Transmission

Licensee within the power sector. A single point of failure

could occur if the power sector relies solely on public telco’s

communication infrastructure. As such, extending the existing

VoIP to the Generation Licensees will enhance the resiliency of

the communication infrastructure in the power sector.


“The Generation Licensee, with Generation Registered Facility

at point of connection of 66kV voltage and above, shall provide

compatible voice communication equipment located in the

Generation Licensee's generation facility control room which

shall be connected to the Transmission Licensee's voice

communication system. The Generation Licensee shall be

responsible for the communication lines from the Generation

Licensee's generation facility control room to the Transmission

Licensee’s termination box that connects to the Transmission

Licensee's voice communication system. The termination box

shall be provided by the Transmission Licensee and shall be

located in the generating station switchhouse. In the event of

Modification


Generation Licensee’s room in the switchhouse

where equipment control facility is provided.

relocation of the termination box or diversion of the

communications lines, the Licensee that initiates the relocation

or diversion shall bear all the costs necessary for the relocation

or diversion including the costs incurred by any other affected

Licensee to divert the communication lines at the affected

Licensee’s end caused by the relocation or diversion.”

Singapore Power Limited To enhance the resilience of the voice

communication system in the power sector, the

Generation Licensee should be linked directly to

the Power System Operator and not via the

Transmission Licensee's voice communication

system.

The Transmission Licensee's VoIP is a separate communication

infrastructure, owned and operated by the Transmission

Licensee within the power sector. A single point of failure

could occur if the power sector relies solely on public telco’s

communication infrastructure. As such, extending the existing

VoIP to the Generation Licensees will enhance the resiliency of

the communication infrastructure in the power sector.

Keppel Infrastructure

Holdings Pte Ltd

Please provide more details on “compatible voice

communication equipment”.

“Compatible voice communication equipment” means any

voice communication equipment that is compatible to work

with SPPG’s VoIP system.


Pte Ltd

ExxonMobil would like to understand the reasons

for 2 separate lines of voice communication with

PSO and Transmission Licensee. We would like to

seek clarification on the following :

a) This is to enhance the resilience for voice communication

especially during power system emergency. One line of voice

communication is via hotline using public telco lines while the

other uses VOIP via private communication system provided by

Modification


(a) Difference in the nature and content of

communication coming through the 2 separate

lines from PSO and Transmission Licensee

(b) Whether all the Generation Licensees or only

Generation Licensees on specific distribution

networks (66kV vs 22kV...) will be affected by this

proposed requirement

(c) Whether the proposed requirement will

create a potential for conflicting instruction or

information to come through the 2 separate lines

that will impact the timeliness of response from

the Generation Licensees in an emergency

situation.

Transmission Licensee. These lines are to link between

Generation Licensees and PSO, not with the Transmission

Licensee.

b) This requirement shall apply to Generation Licensees’ with

Generation Registered Facility at point of connection of 66kV

voltage and above.


“The Generation Licensee, with Generation Registered Facility

at point of connection of 66kV voltage and above, shall provide

compatible voice communication equipment located in the

Generation Licensee's generation facility control room which

shall be connected to the Transmission Licensee's voice

communication system. The Generation Licensee shall be

responsible for the communication lines from the Generation

Licensee's generation facility control room to the Transmission

Licensee's termination box that connects to the Transmission

Licensee's voice communication system. The termination box

shall be provided by the Transmission Licensee and shall be

located in the generating station switchhouse. In the event of

relocation of the termination box or diversion of the

communications lines, the Licensee that initiates the relocation

or diversion shall bear all the costs necessary for the relocation

or diversion including the costs incurred by any other affected

Licensee to divert the communication lines at the affected

Licensee’s end caused by the relocation or diversion.”

Modification


(c) The communication is between the Generation Licensees

and PSO and not the Transmission Licensee. As such, there will

not be conflicting instruction.

TC/2014/13 H3.1 Singapore Power Limited We propose that the clause be amended (in red):

Communications between the remote terminal

equipment located at the Transmission

Licensee’s substation and/or the termination box

of connected person’s intake substation /

switchhouse and the EMS shall be through 2-wire

telephone line or pilot wire or optical fibre data

communication lines provided by the

Transmission Licensee. The equipment shall

communicate using V.34 analog lease-line

modems or X.27 optical modems. The modems

at the EMS will operate as originator while the

remote terminal equipment modems will

operate as answerer.

EMA agrees that the communication should be through pilot

wire or optical fibre data communication lines. However, one

of them should at least be a pilot wire communication line. This

is to ensure high availability of communication at all times,

given that pilot wires do not rely on public telcos’

communication infrastructures unlike optical fibre data

communication lines.

For clarity, EMA is amending the clause as follows:

“Communications between the remote terminal equipment

located at the Transmission Licensee’s substation and/or the

connected person’s intake substation/switchhouse and the

EMS shall be through 2-wire telephone line or pilot wire or

optical fibre communication lines provided by the Transmission

Licensee and at least one of which shall be a pilot wire

communication line. The equipment shall communicate using

V.34 analog lease-line modems or X.27 optical modems. The

modems at the EMS will operate as originator while the remote

terminal equipment modems will operate as answerer.

Modification


TC/2014/15 H4.1 SolarGy Pte Ltd Is there any specification governing the accuracy

of the irradiation meter to be provided? 2nd

class, 1st class or secondary standard to ISO

9060:1990?

The irradiation meter specifications are as follows.


or better


• Directional response (for beam irradiance): +/- 20Wm2

• Response time to reach 95% response: < 30 seconds

Tuas Power Generation

Pte Ltd

Clause H4.1(h) shall be deleted as it is not clear

on what other quantities refer to. Any

amendment shall be through consultation paper

for proposed modification.

Clause H4.1(h) is an existing clause that covers any other

peculiar measurements which are not encompassed in the

above listed bullets, yet essential to be monitored for the

reliability and security of the power system as it evolves.

Singapore Power Limited We noted that the EMA has proposed that

Transmission Licensee shall provide solar global

irradiance measurement at all transmission

substation.

We are of the opinion that it seems

inappropriate for the Transmission Licensee to

provide the weather data for the following

reasons :-

1. Provision of weather data is beyond the scope

of transmission services ;

2. There is no correlation in the deployments of

transmission substations and solar photovoltaic

As part of SPPG’s long term network planning process to

include solar PV projections so as to ensure that the grid is

ready to support greater deployment of solar PV systems, SPPG

should monitor solar irradiance to project the potential solar

PV that are located in regions island wide.

NEA solar irradiation data only covers 5 sites in Singapore.

Given the widespread locations of Transmission Licensee’s

transmission substations, obtaining weather data from these

substations would ensure sufficient coverage of irradiation

geographically.

Solar global irradiance measurements need not be provided for

Modification


systems i.e. information collated might not be

very useful;

3. NEA (the Government agency responsible for

providing weather information services) is

monitoring the solar radiation data at various

locations. To avoid duplicate of data, we believe

it would be more cost effective and efficient for

NEA to share the information with EMA instead

of EMA trying to gather the data through its

Licensee.

We would be happy to discuss with EMA further

to understand the rationale for this new

requirement imposed on a Transmission

Licensee.

all the transmission substations. PSO will discuss with SPPG to

identify the substations where irradiation meters should be

installed to ensure sufficient coverage of irradiation data

geographically.

For clarity, as well as, to include the specifications of the

irradiation meter, EMA has revised the clause as follows:

"(g) Solar global irradiance (applicable only to Transmission

Licensee’s substations); and that comply with the following

minimum specifications. Transmission Licensee shall seek

advice from the Power System Operator on the location of the

transmission substation(s) for installation of solar global

irradiance measurement.


or better


• Directional response (for beam irradiance): +/- 20Wm2

• Response time to reach 95% response: < 30 seconds; and"

TC/2014/17 H4.2 (d) YTL PowerSeraya Pte.

Limited

This clause should not be applicable to existing

steam generating units.

The requirement is applicable to new steam generating units as

well as modification to existing steam generating units.

Modification


TC/2014/20 H4.2 (g) Senoko Energy The provision of an ambient temperature signal

for the CCP to PSCC is likely to will involve costs.

Singapore is a small country and ambient

temperatures generally do not have a large

deviation between PSCC and generating stations.

It may be more economical for PSCC to take

reading of ambient temperature as it is there.

Ambient temperature varies especially in coastal areas where

power stations are usually located. It is therefore not accurate

to take the ambient temperature measurement at PSCC.

Moreover, ambient temperature is one of the parameters used

in CCP’s controller and is therefore readily available for sharing

with PSO.

TC/2014/22 H6 (i) YTL PowerSeraya Pte.

Limited

It should apply only to RTU of the new plant. The requirement is applicable to new RTU as well as

modification to existing RTU.

TC/2014/27 Appendix

I2

WorleyParsons Pte Ltd I2.1:Switchgear (Motors)

BS 3979 was superseded by BS 4999 and BS 5000

in 1981.

Why specify BS EN 60034 for motors when the

internationally accepted code is IEC?

I2.2:Transformers (Transformer Oil)

The updated BS 148:2009 (R2004) is dedicated to

reclaimed mineral insulating oil only and does

not cover unused oil.

The specification for unused mineral insulating

oil is now covered in BS EN 60296, which is

identical to IEC 60296:2012.

I2.1:Switchgear (Motors)

BS EN 60034 is the BS adoption of IEC 60034, and they are

identical in content.

BS 3979:1966 standard was superseded by BS EN 60079-

1:2014.

I2.2:Transformers (Transformer Oil)

BS 148:1998 covered the specification for unused and

reclaimed mineral insulating oil for transformers and

switchgear.

The specification for unused mineral insulating oil is now

covered in BS EN 60296. BS 148 is now dedicated to reclaimed

mineral insulating oil only.

Modification


YTL PowerSeraya Pte.

Limited

It should not be applicable to existing

switchgears, transformers and cables

The requirement is applicable to new switchgear, transformers

and cables as well as modification to existing switchgear,

transformers and cables.

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