26th October, 2012 - Kenya Power | kplc.co.ke · Refer to Appendix 3 containing minutes of pre-bid...

Central Office – P.O. Box 30099 Nairobi, Kenya Telephone – 254-02-2301174 – Telegrams “ELECTRIC”

Telex No. 22253 Fax No. 254-02-3201889 Stima Plaza, Kolobot Road.

Our Ref: KP1/6BA/PROJ/PT/29/12/VOO/voo 26th

October, 2012

M/s

Dear Sir/Madam,

ADDENDUM NO. 2 TO THE TENDER FOR SUPPLY, DESIGN & INSTALLATION OF

KAINUK 220/66/11kV SUBSTATION & ASSOCIATED 220kV LINE- KP1/6BA/PROJ/PT/29/12

The following amendments are made to the specified provisions of the Tender documents for Supply,

Design and Installation of Kainuk 220/66kV substation & associated 220kV line.

1. RELATIONSHIP WITH THE PRINCIPAL TENDER DOCUMENT

Save where expressly amended by the terms of this Addendum, the Principal Tender Document shall

continue to be in full force and effect.

The provisions of this Addendum shall be deemed to have been incorporated in and shall be read as

part of the Principal Tender Document.

2. RESPONSES TO CLARIFICATION

Please refer to the attached Appendix 1 for responses to Bidders requests for clarifications.

3. AMENDMENT TO TECHNICAL SCHEDULES

Refer to Appendix 2 for amendment to Technical schedules in Volume 2, Section 4 in respect to

details of 500kVA auxiliary transformer.

4. MINUTES OF PRE-BID CONFERENCE ON 24TH

OCTOBER 2012

Refer to Appendix 3 containing minutes of pre-bid conference held on 24th October 2012 at Stima

plaza auditorium.

5. AMENDMENT TO DRAWINGS IN APPENDIX B VOLUME 1 OF BID DOCUMENT

Correction of single line drawing Sk.No.11081 ,One Line drawing of MV/EHV system and general

equipment layout at existing Turkwel.

Google Map showing approximate location of the plot at Turkwel power station is available on the

website.

All the other terms and conditions remain as per the Tender document.

Yours faithfully, For: THE KENYA POWER & LIGHTING COMPANY LIMITED

A. GATUKUI (MRS)

PROCUREMENT MANAGER

SL. NO Sec/ Part/

Sub-Sec

Clause Number and

Page NumberSpecification Requirement Comments/ Clarification/ Deviations Kenya Power Clarification

1 Volume-2, Section VII Part 4.0 Schedules of

technical information

Datasheet of power

transformer

Please provide the technical datasheet of double wound power

transformer 220/66/33kV,45 MVA.

Details provided in Addendum number

1

2Volume-1, Section VI

Part A1.2.1(Page 17 of 325) Scope of work

As per specification clause 1.2.1(Page 17 of 325) 33kV system is

with single bus bar configured to house the local supply and one

feeder bay. As per SLD drawing no:SK No.11081,the 33kV system

33kV system NOT in Scope of Works


Part A

8.2.2.3 (Page 103 of

325) &

10.1 (Page 164 of 325

Rating of Auxiliary

Transformer in 33kV Bus

As per specification clause 8.2.2.3 (Page no 103 of 325) & 10.1

(Page no 164 of 325) 200kVA, 33/0.415kV Auxiliary Transformer

is indicated but as per Price schedule no:2, 500 kVA,33/0.433kV is

indicated. Please clarify the rating of Auxiliary transformer.

Auxiliary transformer is 1noX 500kVA

11/.433kV transformer.Amend Price

schedules accordingly.

4

Volume-2,Section VII –

Forms and Procedures

Part 1.2 – Price

Schedules

Bills of Quantities

Number of 220kV Isolator

Number of 220kV isolator with two integral earth switches is

mentioned as 1 in Price Schedule no-2 whereas it is not shown in

SLD Drawing no: SK.No.11081 .Please clarify the requirement of

220kV isolators with two earth switches.

220kV isolator with two integral earth

switches is Nil.Refer to Price Schedule 3-

220kV Kainuk.


Part A

5.2(Page 74,75 of

325)

Dedicated CT and PT for

tariff metering

As per specification clause 5.2(Page no 74,75 of 325) dedicated

CT, PT shall be provided for tariff metering purpose. As per SLD

drawing no:SK No.11081, dedicated CT, VT for tariff metering is

not indicated. Please clarify the requirement of dedicated CT , PT

for tariff metering for 220kV system at proposed Kainuk

Substation.

High Precision tariff metering to be

provided for the 220kV line from

existing Turkwel to proposed Kainuk

s/s.The high precision tariff metering CT

& PT is to be positioned at Turkwel

220kV switchyard.


Part A

5.2(Page 74,75 of

325)Tariff metering

We presume tariff metering system to be considered only for the

incomer of 220kV and 66kV line feeder. Please confirm.

High Precision tariff metering is only

applicable to the 220kV line from


Part A11.1(Page 179 of 325)

Tariff metering for 33kV

outgoing line

We presume the tariff metering system is not required for 33kV

system. Please confirm.



Part A

10.1(Page 164 of

325)

11/0.415kV Distribution

offsite transformer

As per specification clause 10.1,(Page 164 of 325) one Number of

11/0.415kV offsite transformer will provided for auxiliary supply

to 415V switchgear. We presume that same will be located close

to switchyard fence and 11kV supply shall be made available by

client near the switchyard fence. Please confirm.

The Scope of Works require Bidder to

design,install & commission off site

433VAC supply.


Part A

12.3.4(Page 188 of

325)

Tertiary winding neutral

earthing arrangement.

As per specification clause 13.1, (Page 213 of 325) the 33kV earth

fault requirement is indicated as 750A. Please clarify the neutral

earthing arrangement of 33kV tertiary winding of power

transformer.


Appendix 1 Responses to Bidders queries & requests for clarifications.

ELECTRICAL QUERIES FOR KAINUK SUBSTATION

Design Supply & Construction of Kainuk 220/66kV Substation for Kenya Power

Page 1 of 15


Part A1.4 (Page 18 of 325)

Terminal Points for 220kV

Transmission line

Kindly provide the drawing indicating the length between the

switchyard and transmission line.

Bidders are required to familiarise with

the existing site conditions and factor

the same in their designs for the 220kV

TL.


Part A

10.3.2.2(Page 170 of

325)110V DC battery

We presume the 110V battery ,battery charger & DCDB shall be

designed to cater for the present scope of work. We have not

considered any load for future scope. Please confirm.

Bidders are required to submit detailed

designs fulfilling the Employer's

requirements for 110VDC as set in

Volume 1 of the Bid document.

12 General -Single Line diagram for

substation

Kindly provide the legible copy of single line diagram for the

Kainuk substationRefer to attached SLD in Volume 3.


Part A 3.2.1(Page 47 of 325) Plan and section layout

As per specification clause 3.2.1(Page 47 of 325)the substation

arrangements and layouts shall be part of bid documentation.

Kindly provide the 220kV/66kV/33kV Kainuk substation Plan and

section layout.

This is a turnkey project and Bidders

are required to undertake a detailed

design for the required 220/66/11kV

substation and associated 220kV TL and

submit the same for approval by the

Employer.


Part A 3.2.1(Page 47 of 325) Control room layout

Kindly provide the control room building layout for kainuk

substation as mentioned in specification clause 3.2.1(Page 47 of

325) .



design for the Control room building

within the Employer's requirements as

set in the Bid document & submit the

same for approval by the Employer.


Part A Page 108 of 325 Telecommunication system

Please clarify the requirement of Telecommunication system at

Kainuk to Kitale substation line feeder. Please clarify the scope of

telecommunication system at Kainuk and Kitale substation.

Refer to Para.8.3 for details of the

Telecommunication scheme Scope of

Works.The Scope of Works does not

include Kitale.


Part A3.3.9 (Page 54 of 325) Type of ACSR conductor

Kindly provide the types of ACSR conductor to be used in 220kV,

66kV and 33kV system.

Bidder is required to undertake

detailed design using the Employer's

requirements as set in the Bid

document and submit the same for

approval by the Employer.


Part A

16.17.1.2(Page 264 of

325)Lighting

We presume light fittings shall be mounted on Lightning

mast/Gantry structures/Building. Please confirm.







Part A12.6(Page 202 of 325)

Online DGA,FO based

temperature measurement

As per specification clause 12.6 (Page no 202 of 325) Online

DGA,FO based temperature measurement is required for

transformers above 100MVA.We presume it is not applicable for

the 45 MVA power transformer. Please confirm.

Online DGA,FO based temperature

measurement is not applicable to the

project.

Page 2 of 15


Part A1.2.1(Page 17 of 325) Scope of work

As per specification clause 1.2.1(Page 17 of 325) 220kV Kainuk

Substation is with one and half arrangement. As per SLD drawing

no:SK No.11081,ring main bus scheme is indicated. Please clarify

the arrangement of 220kV system.

The required 220kV busbar at Kainuk is

to fulfill one and a half diameter.Refer

to ammended SLD .


Part A4.3.1 (Page 63 of 325) Type of disconnectors

Centre break isolator shall be considered for 220kV, 66kV, and

33kV system. Please confirm.







Part A

4.2.1, 5 (Page 59,74

of 325)

Live tank CT, PT, Live tank

CB

Live tank CT, CB shall be provided for 220kV, 66kV and 33kV

system. Bidder to rephrase the question.


Part A

8.2.1.2 (Page 91 of

325)

Remote end protection

scope

We presume that 220kV line feeder remote end current

differential relay at Kitale substation is not included in our scope

of work. Please confirm

Please refer to Employer's reuirements

as set in Para.8.2.1.2 when undertaking

detailed design for 220kV TL protection

and submit the same for

approval.Kitale is NOT part of the Scope

o Works.


Part A

8.2.2.2 (Page 101 of

325)

Distance protection for

33kV systems

As per specification 33kV outgoing lines are to be provided with

distance protection with PLC / fiber optic communication system.

As per general practice 33kV line feeder will be provided with

feeder protection relay including functions for over current, earth

fault, sensitive earth fault protection .Please confirm the

protection/communication requirement for 33kV system.



Part A

8.2.2.2 (Page 101 of

325)

Distance protection for

66kV systems

As per specification 66kV outgoing lines are to be provided with

distance protection with PLC / fiber optic communication system.

Please clarify the type of communication system to be used for

66kV line.

Please refer to Employer's

requirements as set in Para.8.2.2 when

undertaking detailed design for66kV

feeder protection and submit the same

for approval.

25

Volume-2, Section VII

Part 4.0 Schedules of


Page 22 of 11733kV isolator operating

mechanism

As per technical schedule, operating mechanism of 33kV isolator

is mentioned as Motor operated. As per KENYA practice the 33kV

isolator operating mechanism will be manual. We are considering

only manual operating mechanism for 33kV isolator. Please

confirm.



Part A14(Page 216 of 325) DG set

We presume separate room for DG set is not required and DG

shall be outdoor , silent type. Please confirm.


requirements as set in Para.14 when

undertaking detailed design for

Emergency Diesel Generator and

submit the same for approval by the

Employer.


technical informationExisting Turkwell scope

As per price schedule no:1,2, three phase link box is indicated

Turkwell substation and Kainuk substation. As per scope of work

EHV cable is not included. Please clarify the requirement of link

box.

There is no EHV cable works in the

Scope of Works.Amend Price schedules

i.e. Volume 2, 7-1-2-2

Page 3 of 15



Kainuk Substation control

room

As per price schedule no:2,Kainuk substation control room area is

given as 600 sq.m. We presume control room shall be optimized

as per requirement. Please confirm.


requirements as set in Para.14 7 & size

stated in schedule 2 of Price forms

when undertaking detailed design for

the Kainuk Control room and submit

the same for approval by the Employer.

29 GeneralSLD drawing no:SK

Number11081

220kV Lightning arresters in

SLD

Please clarify the purpose of two set of lightning arresters in Kitale

line feeder at Kainuk Substation.

Only One (1no.) 220kV surge arrester is

proposed.refer to ammended SLD.



Requirement of CTs in

220kV system at Kainuk

substation

As per price schedule no:2, 24 Nos of CT is indicated for 220kV

system at Kainuk substation but only 12 Nos. of CT is shown in

SLD drawing no:SK No.11081. Please clarify the requirement of 24

Number of CT in the substation.

24Nos. 220kV CTs required in Kainuk

220kV busbar.Refer to amended SLD.



Requirement of PTs in 66kV

system at Kainuk substation

As per price schedule no:3, 12 Nos of PT is indicated for 66kV

system at Kainuk substation but only 9 Nos. of PT is shown in SLD

drawing no:SK No.11081. Please clarify.

Correct numbers is 9nos.refer to SLD.



Requirement of Surge

arresters in 66kV system at

Kainuk substation

As per price schedule no:3, 9 Nos of Lightning arresters is

indicated for 66kV system at Kainuk substation but 12 Nos.of

Lightning arresters is shown in SLD drawing no:SK

No.11081.Please clarify.

Number of 66kV surge diverters is

9nos.Refer to SLD.



Number of Isolators without

earth switch in 66kV

system at Kainuk substation

As per price schedule no:3, 7 Nos of Isolators without earth switch

is indicated for 66kV system at Kainuk substation but 11 Nos.of

Isolators without earth switch is shown in SLD drawing no:SK

No.11081.Please clarify.

Number of 66kV airbreak switches is

11nos.Refer to SLD.



Requirement of Surge

arresters in 33kV system at

Kainuk substation

As per price schedule no:4, Number of Lightning arresters is

indicated as zero for 33kV system at Kainuk substation but 1

Lightning arrester is shown in SLD drawing no:SK No.11081 at

33kV side of 33/0.415kV Auxiliary Transformer.Please clarify.




Number of isolators in 33kV

system

As per price schedule no:4,1 No of Isolator is indicated for 33kV

system at Kainuk substation but 2 Nos. of Isolator is shown in

SLD drawing no:SK No.11081.Please clarify.



Part A8 (Page 81 of 325)

Bus bar protection for 33kV

bus

We presume bus bar protection for 33kV system is not applicable.

Please confirm.


37 General - Soil resistivityKindly provide the value of soil resistivity in Kainuk substation for

earthing design.

Refer to Para.16.6.2.2.Bidder required

to carry out own investigations.



Number of CTs in 220kV

system at Turkwell yard

As per price schedule no:1, 9 Nos of CT is indicated for 220kV

system at Turkwell yard but it is not shown in SLD drawing no:SK

No.11081. Please clarify the requirement of 9 Number of CT in the

substation.

Ammend Price Schedule 1 as follows:-

i)number of 220kV CTs to 12nos. ii)

Number of 220kV CB is two (2nos.) iii)

220kV Disconnector, motorised

(3-phase) is four (4nos.)

ELECTRICAL QUERIES FOR EXISTING TURKWELL SUBSTATION

Page 4 of 15



Number of CVTs in 220kV

system at Turkwell yard

As per price schedule no:1, 9 Nos of CVT is indicated for 220kV

system at Turkwell yard but it is not shown in SLD drawing no:SK

No.11081. Please clarify the requirement of 9 Number of CVT in

the substation.

Ammend Price Schedule 1 as follows:-

i)number of 220kV CVT to 3nos.


Part A

5.2(Page 74,75 of

325)

Dedicated CT and PT for

tariff metering

As per specification clause 5.2(Page no 74, 75 of 325) dedicated

CT, PT shall be provided for tariff metering purpose. As per

schedule no: 1 dedicated CT, VT for tariff metering is not

indicated. Please clarify the requirement of dedicated CT , PT for

tariff metering for 220kV system at Turkwell yard.

220kV Tariff metering is indicated

under item 1.13 in Schedule One of

prices.

41 Scope of work 1.2 Page (17 of 325) Existing Turkwell scope

As per specification, Turkwell substation to be extended to allow

for the 220kV Tee off to the proposed Kainuk substation. Please

clarify whether below ground earthing to be extended for the

switchyard extension.Incase included in scope please furnish the

existing earth grid size, material and spacing.

The earthing of switchyard extension is

to to be connected to earthing system

of existing 220kV switchyard and

overall earth resistance value MUST be

less than one (1) ohm.


We presume lighting, lightning protection for the Turkwell

substation extension is not in scope. Please confirm.

Lightining protection of the extended

220kV switchyard at Turkwel is part of

Scope of Works.Refer to Para.3.3.1 and

item 7.2 in Price Schedule 1.


We presume necessary AC,DC supply for the Turkwell substation

extension work will be made available by client. We have not

considered the AC & DC distribution board, lighting distribution

board,110V & 48V battery, battery charger in our scope of work.

Please confirm.

LVAC & DC for 220kV extension works

at Turkwel switchyard part of Scope of

Works.Refer to items 11.1,11.2 and

11.3 in Price Schedule 1


We have not considered any control building extension in

Turkwell substation. Necessary space provision to keep control,

relay panel /Communication panel shall be provided in the

existing control room. Please confirm.

Refer to item 10.13 of Price schedul 1.A

Control building for the

communication,control & relay panels

to be provided for the 220kV extension

works at Turkwel.


Kindly provide the existing bus bar protection panel make , model

& drawing and existing SAS architecture to extend the same for

the present scope.

Please refer to attached drawings

showing existing single line drawing &

equipment layout for existing 220kV

switchyard at Turkwel.Modification of

existing SAS/SCADA system for Kengen

generating station NOT in scope of

works.


Please clarify the type of bus bar protection available in existing

Turkwell substation-Centralized/Decentralized , single main or

Double main bus bar protection.

Bidders required to familiarise

themselves with existing network and

use the attached existing single line

drawing & equipment layout for

existing 220kV switchyard at Turkwel

Page 5 of 15


Please clarify whether Turkwell Substation is equipped with

Substation Automation System.







Part A 3.2.1(Page 47 of 325)

Layout of existing 11/220kV

Turkwell substation.

Kindly provide the existing 11/220 kV Turkwell substation Plan

and section layout as mentioned in specification clause 3.2.1(Page

47 of 325) ..







Part A 3.2.1(Page 47 of 325)

Layout of existing 11/220kV

Turkwell substation.

Kindly provide the Turkwell substation existing control room

layout.

Bidders may familiarise themselves

with existing Turkwel control room

layout for purposes of raising their

designs for the Control rooms proposed

under this project.

1

Technical Specification

for substation Section

VI Part A

Clause 16.6.1 (Page

232/325)

Contour map &

Photographs

Please arrange to provide the contour map & Photographs of the

jobsite.



study of ground conditions and

topography as stated in Volume

1,Chapter 16-Civil Works.

2



VI Part A

Clause 16.15.3.2

(Page 236/325)Wind load

We propose DIN VDE 0210 to be used for wind load on steel

structures & BS 6399 Part II for wind load on building. Kindly

confirm

Refer to Volume 1 Para.1.5 service

Conditions.

3



VI Part A

D 1.00 b) (Page

241/325) Finished Ground Level Please specify Finished Ground Level of the substation


are required to erect buildings in

conformity to employer's requirements

as stated in Volume 1,Chapter 16-Civil

Works and the mentioned standards..

4



VI Part A

Clause 16.16.8.1

(Page 241/325)Blinding concrete

As blinding concrete shall have a minimum PCC grade of M15 as

per IS code will be used .Hope this is in order. Kindly confirm


are required to utilise construction

methods,subject to Employer's

approval , as stated in Volume

1,Chapter 16-Civil Works and the

standards mentioned therein.

CIVIL QUERIES FOR KAINUK SUBSTATION

Page 6 of 15

5



VI Part A

Clause 16.16.8.1

(Page 241/325) Concrete for Foundation

As per clause no h) 10.3 of section VI part B concrete for

foundation shall be C25 Grade with minimum cement content of

300kg/cum & maximum w/c ratio of 0.6. Eleventh line of page

241/325 of section VI part A says concrete to be C35 which

requires 300kgs of cementitious content as per BS 5328 Part I,

where as the 4th point of minimum mix design requirement of

specification asks for minimum total cementitious quantity of 370-

380kg/cum.Third point of minimum mix design requirement asks

for minimum 120kg of OPC & minimum 280kgs of GGBS which

aggregates to minimum of 400kgs.We propose C25 grade of

concrete with 300kgs of cementitious content with w/c ratio of

0.6.Kindly confirm.







6



VI Part A

Clause 16.16.9 (Page

255/325)Grade of Steel

As per the clause minimum grade of steel is 460 whereas as per

clause 7.2 section VI Part B page 57/109 grade of structural steel

is S235JR and S355JO. We propose to use S235JR. Kindly confirm.







7



VI Part A

Clause 16.6.2

(Page 241/325)Soil Investigation Report

Please arrange to provide the detailed Soil Investigation Report as

per attached annexure. Also ascertain presence of

montmorillonite,chilkinite & kaolinite & any other element

causing volumetric change in soil.(within 3m of natural ground.)

Refer to Para.16.6.2.2.Bidder required

to carry out own investigations.

8



VI Part A

Clause 16.6.2

(Page 241/325) Depth of Water table level Kindly confirm the depth of Water table level.

Refer to Para.16.6.2.Bidder required to

carry out own investigations.

9



VI Part B

Clause 7.1

(Page 56/109)

Steel works for switchyard

structure

We propose to extend the clause 7.1 to Substation switchyard

structure for 6mm thickness of main leg & 4mm thickness for

other tower steel works & bracings. Kindly confirm.

Refer to Volume 1 Para.2.11 Galvanized

Work in respect to steel structures

intended for outdoor use in the

substation switchyard.

10



VI Part A

Clause 16.6.1

(Page 232/325)Depth of Foundation Minimum depth of foundation below NGL.


complete topographical & Condition

surveys.

11



VI Part A

Clause 16.6.1

(Page 232/325) Highest Flood Level Please confirm Highest Flood Level


complete topographical & Condition

surveys.

12



VI Part A

Clause 16.16.13.1

(Page 232/325) Access road width

Major access road will be 7.3m wide. The same is not reflected in

prices & quantities for definite work section VII part 1.2 page 9 of

12.

Major access roads to be considered as

7.3meteres wide.

Page 7 of 15

13 General - Tender documentPages 283 to325of sec. VI part A & 108,109 of sec.VI part B are

missing from the copy of technical specification

Pages 283 to 285 of sction VI are in

Appendix A Drawings.Drawings are

single line drawing.pages 108-109 are

drawings of typical 220kV lattice steel

structure.Retrieve correct document

i.e. Volume 1 from KPLC website.

Page 8 of 15

14 General -

Layout and section for

control room Building

Please provide Layout and section for control room Building &

gate house.(and any other building if any)


are required to provide a detailed

design of Control building and others

as required in Scope of Works and in

conformity to requirements in Volume

1,Chapter 16-Civil Works.The designs

will be subject to Employer approval.

15 General - Type of building confirm type of building whether RCC or Steel ditto

16 General - Finishing schedules Please provide Finishing schedules. ditto

17 General - Water tank capacity Please confirm Water tank capacity. ditto

18 General - Septic tank capacity Please confirm Septic tank capacity. ditto

19 General - Plinth height Please confirm plinth height above FGL. ditto

20 General - Height of building Clear height of building. ditto

21 General -Provision of crane/mono

rail & capacity

Please confirm provision of crane/mono rail & capacity(if

required)

ditto

22 General - Cable pull pit in CRB Confirm Requirement of cable pull pit in CRB. ditto

23 General -Provision of access to roof Please confirm provision of access to roof through

Staircase/ladder.

ditto

24 General - Type of parapet wall Confirm type of parapet wall(brick/RCC) and size. ditto

25 General - Requirement of roof

projectionConfirm requirement of roof projection.

ditto

26 General - Joinery details Describe Joinery details.(type of door and windows) ditto

27 General -

Requirement of false

ceiling/false flooring/under

deck insulation.

Any requirement of false ceiling/false flooring/under deck

insulation.

ditto

28 General - Width of Brick wallPlease specify Width of Brick wall & any special requirement like

insulation/cavity .

ditto

29 General - Requirement of garland

drainWhether garland drain is required around building

ditto

30 General -Requirement for Fire rated

doors/windows and walls. Confirm requirement for Fire rated doors/windows and walls.ditto

31 General -

Requirement of special type

of toilet for physically

challenged personAny requirement of special type of toilet for physically challenged

person.

ditto

32 General -Type of roof water proofing

Please specify type of roof water proofingditto

33 General - Screed concrete Please give specification for screed concrete if required. ditto

34 General - Specification of roof water

pipeCheck for specification of roof water pipe.

ditto

35 General - Roof water pipe Whether roof water pipe has to be claded.Kindly confirm ditto

CIVIL QUERIES FOR BUILDINGS

Page 9 of 15

36 General - Chequered plate Kindly confirm chequered plate thickness. ditto

37 General - Hand rail Type of hand rail for staircase. ditto

38 General - Rubble stone masonryWhether rubble stone masonry is required below grade

slab/cable pull pit. Kindly confirm

ditto

39 General - Rating for green building Rating for green building and standard to follow. Kindly specify (If

required)

ditto

40 General - Height of AHU room Clear height of AHU room. Please specify. ditto

41 General - Miscellaneous buildings Miscellaneous buildings to be constructed. Please mention ditto

42 General - Minimum width of

staircase flightPlease mention minimum width of staircase flight.(If required)

ditto

43 General - Factor of Safety under

Normal condition

Please specify Factor of Safety under Normal condition against

Sliding & Overturning.


are required to ensure all materials &

workmanship is within the Employer's

requirements in the Bid document.

44 General -Factor of Safety under SCF

condition

Please specify Factor of Safety under SCF condition against Sliding

& Overturning.





45 General -

CBR Value

Please specify CBR Value.





46 General -

Height of fence & Boundary

wallPlease specify Height of fence & Boundary wall.





47 General -

Thickness of micro grading

Please mention thickness of micro grading.





48 General -

Plinth height

Please mention Plinth height above FGL.





QUERIES RELATED TO OUTDOOR CIVIL

Page 10 of 15

49 General - Surchage PressurePlease mention Surchage Pressure required for Cable trench

design.





50 General -

Minimum fire resistance

hoursPlease mention minimum fire resistance hours.





51 General - Loss of contactWe understand 20% Loss of contact is allowed for foundation

design. Kindly confirm.





52 General - DrainWe propose Drain to be provided on one side of road. Kindly

confirm.


are required to ensure all detailed &

completed design ,equipment selection

& construction meets the Employer's

requirements as stated in the Bid

document and standards mentioned

therein.

53 General - Type of fire wall Please confirm type of fire wall (Brick / RCC) ditto

54 General - Size of gate Please specify Size of gate with wicket gate required or not ditto

55 General - Trafo. Soak pit Please specify Trafo. Soak pit with gravel filling or gratings ditto

56 General -Requirement of Common

oil collection pit

Please specify requirement of Common oil collection pit capacity

for Trafo.

ditto

57 General - Rain water harvesting Whether Rain water harvesting required or not ditto

58 General - Landscape Whether Landscape required or not in front of building. ditto

59 General - DG set building /platform Requirement of DG set building /platform (if required) ditto

60 General - Type of Boundary wall Please specify type of Boundary wall ditto

61 General -Fire Fighting pump house &

Water Tank Whether Fire Fighting pump house & Water Tank required.

ditto

62 General - Stool arrangementCan we adopt stool arrangement for equipment support

structures.


are required to ensure all detailed &

completed design ,equipment selection

& construction meets the Employer's

requirements as stated in the Bid

document and standards mentioned

therein.

63 General -Factor of safety under

normal conditionPlease specify Factor of safety under normal condition.

ditto

QUERIES RELATED TO OUTDOOR STRUCTURAL

Page 11 of 15

64 General - Factor of safety under SCF

Please specify Factor of safety under SCF.ditto

65 General -Type of Equipment support

structuresPlease specify Type of Equipment support structures-(lattice/Pipe)

ditto

66 General - LM Height Please specify LM Height with No. of Platforms. ditto

67 General - Grade of bolt Please specify Grade of bolt ditto

68 General - SCF & WIND loadSCF & WIND load will not be considered acting together. Hope it

is in order. Kindly confirm.

ditto

69 General - Site location map Site location map to visit ditto

70 General - Coordinates of boundary Please specify coordinates of boundary ditto

71 General - Approach road from public

road to site

Understand that Approach road from public road to site is not in

bidder's scope. Kindly confirm

ditto

72 General -Presence of any well in the

job sitePlease confirm presence of any well in the job site

ditto

73 General - Presence of any structure

to be demolished in job sitePlease confirm presence of any structure to be demolished in job

site

Refer to Para.16.6 Site surveys.


Part A 3.2.1(Page 47 of 325) Existing Turkwell Substation

Understand that the location where new bay is to be installed is

levelled & aggregates is already laid. We shall use the same

aggregates & any shortcoming shall be made good. Please

confirm.

Refer to Para.16.6 Site surveys.



Kindly provide the existing 11/220 kV Turkwell substation Plan

and section layout as mentioned in specification clause 3.2.1(Page

47 of 325)

ditto



Kindly provide the Turkwell substation existing control room

layout.

No plan will be provided.Bidders may

familiarise themselves with existing

Turkwel control room layout for

purposes of raising their designs for the

Control rooms proposed under this

project.

1Section V1 Part- A Vol

1 of 2

Clause No : 16.17.2.5

(Page 272 of 325)General

If the AC capacity is less than

a) 30 TR can we propose Air cooled Package air conditioners.

Kindly confirm

b) 10TR can we propose Air cooled split air conditioners. Kindly

confirm

Bidders to refer to service conditions &

Employer requirements stated in

Para.16.17.2.5.


1 of 2

Clause No : 16.17.2.5

(Page 272 of 325)General

Kindly provide the specification for thermal insulation (for ducts

and chilled water pipes of both above ground and under ground)

ditto


1 of 2

Clause No :

16.17.2.5( Page 273

of 325)

Type of system for standby

diesel generator room

Booster ventilation has been preferred for DG when it is running.

Kindly provide the specification for the same.

ditto

CIVIL QUERIES FOR EXISTING TURKWELL SUBSTATION

HVAC QUERIES FOR KAINUK SUBSTATION

Page 12 of 15


1 of 2

Clause No : 16.17.2.5

(Page 273 of 325)

Type of system for Battery

room

As per clause ventilation has to be provided for battery room but

in Section V1 Part- A Vol 1 of 2, Clause No : 16.17.2.5, Page 278

of 325 air conditioning system has been preferred for battery

room. Kindly confirm which system shall to be adopted

ditto


1 of 2 Clause No : 16.17.2.5 General

If the central air conditioning system has to be considered as per

specification

a) Kindly provide the type of system ( DX AHU / chiller) to be

considered for air-conditioning system

b) Kindly provide the type of compressor to be considered for AC

system

c) We have considered horizontal split casing pumps for chilled

water pumps. Please confirm d)

whether the AC system shall be provided with BEMS. Please

confirm.

ditto


1 of 212.5 Transformer fire protection

We have considered nitrogen fire protection for transformers.

Please confirm

Bidder to provide offer in compliance

to Para.12.5,Volume for Employer's

approval.

HVAC QUERIES FOR FIRE PROTECTION

Page 13 of 15


1 of 2 Clause No : 16.17.2.1

Fire detection & Fire

suppression system

In the clause Fire detection & Fire suppression system has been

but we are not able to find the technical specification and the

area for which the same has to be considered. Kindly provide the

specification if it has to be considered.


detailed design in fire protection using

the Employer's requirements as set in

the Bid document and submit the same

for approval by the Employer.


1 of 2General Scope of hydrant system

Specification does not calls for hydrant system, kindly confirm the

scope of hydrant system for switchyard area and if is there kindly

confirm the distance of the tapping point to be considered and

the pressure available at that point.

ditto


1 of 2General Scope of MVWS system

Specification does not calls for MVWS system for cable celler

room. kindly confirm the same.

Bidder to re-phrase query.


1 of 2 Clause No : 16.17.2.1 Tapping point

Kindly confirm the location of the tapping point to be considered

and the pressure availability.

Bidder required to familiarise

themselves with site conditions.

Section II-ITB ITB 20 Bid bond FormatOur bank can’t issue a bid security with a validity more than 120

days.

According to the tender bid security should be valid for 208 days.

In this case our bank could issue two bid securities 120 + 88 days.

So it will be two bid securities in consecutive order.

I would like to know if this is acceptable by Kenya Power.

Two bid securities NOT acceptable.Bid

bond to be in conformity to ITB 20.

Kindly confirm where to use under hang post insulators for 220 & 66kV

Bidders are to state where they are to

be used in their detailed designs for the

220kV line towers & substation works.

Provide core wise details. Bidders to refer to Para.5 & 6 of

volume 1 in design calculations for

determining current ratio,knee point

voltage and excitation currentsProvide details of existing busbar protection system at Turkwel Refer to attached drawings of existing

single MV/HV system at Turkwel.

Elaborate scope of supply & installation work for OPGW in

Turkwel substation.

Refer to Para.8.3 for details.

Will there be a new building or an extension of existing control

building.Kindly furnish plan & elevation drawings for control

building.

Scope of Works is for new control

building at Turkwel of about 40 sq.m

detached from exisiting control room .

Installation work for OPGW at Kainuk. Refer to Para.8.3 for details.

GENERAL QUERIES

OTHER QUERIES

HVAC QUERIES FOR POTABLE WATER

Page 14 of 15

2) Referring to Paragraph 1.30 on page 28 of 109 of the Technical

Specifications for Transmission Line Works regarding Training.

2.1) The document states that “There shall be no constraints on

the number and category of Kenya power’s staff to be trained on

site” We request that the maximum number be specified as to

accurately estimate the cost.

2.2)In addition the second last paragraph reads: “ The Training

shall be specific to this project and shall include, but not limited

to, foundation design, tower design and detailing, the use of PLS

Tower or similar tower design software and the use of the PLS

CADD or similar profiling software, both of which shall be

provided as part of the Contract.”

The training should at the minmum

cater for 2nos. Kenya power staff.

Page 15 of 15

Appendix 2 Technical Schedules for Auxiliary transformer.

11/0.415kV; 500kVA EARTHING/AUXILIARY TRANSFORMERS

(CAF-CAF)

UNIT DATA

Required Offered

1. Earthing/Auxiliary Transformer 11/0.415kV; with 500 kVA

auxiliary winding

1.1 Manufacturer & Place of manufacturing

1.2 Type designation

1.3 Type

Three phase, oil

immersed,

core type

1.4 Standards

IEC 60076-1, -2,

-3, -5, -10,

60296

NEMA TR1

1.5 Mounting Outdoor, wheel

1.6 Rated voltage ratio

kV 11/0.415

1.7 Rated frequency

Hz 50

1.8 Vector group

ZNyn11

1.9 Cooling

ONAN

1.10 Method of earthing

- HV winding Solid

- LV winding Solid

1.11 Type (graded/non-graded) of windings

- HV winding Non-graded

- LV auxiliary winding Non-graded

1.12 Rated voltage of windings

- HV winding kV 11

- LV auxiliary winding kV 0.415

1.13 Highest voltage for equipment

- HV winding kV 12

- LV auxiliary winding kV 0.433

1.14 Rated lightning impulse withstand voltage at HV Terminal

kV 95

1.15 Rated power frequency withstand voltage at

- HV terminal kV 38

- LV terminal kV 38

- HV neutral terminal kV 38

1.16 Rated power at site conditions

kVA 500



(CAF-CAF)

UNIT DATA

Required Offered

1.17 Maximum temperature rise at rated power at:

- Windings K 55

- Hot spot of windings K 68

- Top oil K 50

- Oil at inlet of cooler K

- Oil at outlet of cooler K

- Core K

1.18 Temperature rise of winding due to short circuit duration of 2

s and HV side short circuit current of 25 kA

1.19 No load losses at rated voltage and rated frequency

kW

1.20 Load losses at 75 C, and rated frequency, rated power and

principal tapping:

1.21 Maximum current density at rated power:

- HV winding A/mm2

- LV auxiliary winding A/mm2

1.22 Symmetrical short circuit withstand current (duration 2 s) at:

- HV terminal kA 25

- LV auxiliary terminal kA

1.23 Magnetising current (HV winding)

- At 90% rated voltage A



1.24 Maximum flux density in core at rated voltage, power

frequency and principal tapping

T

1.25 Type of tap changing

Off-load

1.26 Type designation of off-load tap changer

1.27 Tapped winding

HV

1.28 Tapping range

+5% -5%

1.29 Tapping step

2.5%

1.30 Number of steps (positions)

4 (5)

1.31 Limitation and withstanding of fault current in neutral for 30 s

A 750

1.32 Impedance voltage range at 75 C and principal tapping:

- At principal tapping > 4%



(CAF-CAF)

UNIT DATA

Required Offered

- At maximum voltage ratio >4%

- At minimum voltage ratio >4%

1.33 Resistance of winding at 75 C and principal tapping:

- HV side /phase

- LV auxiliary side /phase

1.34 Zero phase sequence impedance of inter-star windings at

75 C (LV windings open-circuit)

/phase

1.35 Zero phase sequence impedance of LV windings at 75 C

(inter-star windings open-circuit)

/phase

1.36 Terminal connection

- HV terminal Air-filled cable

box

- LV terminal Air-filled cable

box

- HV neutral terminal Air-filled cable

box

- LV neutral terminal Air-filled cable

box

1.37 Isolating link for test purposes (not required if separable

connector allows testing)

- HV terminal Yes

- LV terminal No

1.38 Mounting of current transformer at

- HV terminal In tank

- Neutral terminals In tank or box

1.39 Current transformers

HV Line

- Number of cores 2

- Rated extended primary current 120%

- Ratio (TR = turns ratio)

I core 1/50 (TR)

II core A 50/1

- Class

I core PX

II core 5P20

- Knee point voltage (Ek)

I core V

II core V N/A

- Exciting current (IE ) at Ek

I core mA

II core mA N/A

- Rated output (Burden to be 25-100% rated burden)



(CAF-CAF)

UNIT DATA

Required Offered

I core VA N/A

II core VA 15

HV Neutral

- Number of cores 3



I core A 750/1

II core 1/50 (TR)

III core 1/2000 (TR)

- Class

I core 5P20

II core

III core PX

- Knee point voltage (Ek) PX

I core V N/A

II core V

III core V


I core mA N/A

II core mA

III core mA


I core VA 15

II core VA N/A

III core VA N/A

LV Line (Only AIS connections)

- Number of cores N/A

- Rated extended primary current N/A


I core A N/A

- Class

I core N/A


I core V N/A


I core mA N/A


I core VA N/A

LV Neutral

- Number of cores 1



I core A 1/750 (TR)

- Class

I core PX



(CAF-CAF)

UNIT DATA

Required Offered


I core V


I core mA


I core VA N/A

All class PX CTs shall have a rated secondary current, ISN

A 1.2

1.40 Oil:

Manufacturer

Type designation

Standards IEC 60296

Minimum flash point oC

Viscosity

At 20oC mm

2/s

At 50oC mm

2/s

At 80oC mm

2/s

Maximum dielectric strength for 1 min kV

Dielectric factor

Acidity (neutralization value) mgKOH/g

1.41 Type of dehydrating breather (Non-sealed transformers)

Silicagel –

automatic

recharge type

1.42 Conductor material (e.g. copper, work hardened copper, etc.):

HV windings

LV windings

1.43 Conductor insulation:

HV winding

LV winding

1.44 Calculated thermal time constant

min

1.45 Thickness of transformer tank

- Sides mm

- Bottom mm

- Top mm

1.46 Material of transformer tank

1.47 Thickness of radiator plates

mm

1.48 Total volume of conservator

litres

1.49 Masses of transformer

- Core and coils kg

- Total mass excluded oil kg



(CAF-CAF)

UNIT DATA

Required Offered

- Oil mass in tank kg

in radiators kg

total kg

- Total mass kg

1.50 Mass of transformer as arranged for transport (heaviest part) kg

1.51 Dimensions of transformer arranged for transport

- Height m

- Width m

- Length m

1.52 Maximum noise level (to NEMA TR1)

dB 56

1.53 Vibration test (Y/N) N

1.54 Conservator vessel, radiators, fan grilles, control boxes or

cubicles and pipework anticorrosion protection

Hot dip

galvanized and

painted

1.55 Tank anticorrosion protection

1.56 Control/Protection voltage

V 110 DC

1.57 Manufacturer quality assurance Yes

- According to ISO 9000, 9001, 9002, 9003 and 9004

1.58 Type test certificates to be issued by:

- Independent Laboratory or independently witnessed type

test certificate

Yes

1.59 Special Tests to be performed:

- Measurement of zero-sequence impedance

- Determination of sound levels

- Measurement of harmonics of no-load current

Yes

No

No

Appendix 3 Minutes of Pre-Bid conference

Pre-Bid Meeting for Tender number KP1/6BA/PROJ/PT/29/12-Design,

Supply and Construction of 220/66/11kV substation & associated 220kV

line.

Date held: 24th

October 2012

Time: 10.30 a.m. to 11.30 a.m.

KPLC staff present 1 Eng Elijah Bosire – Projects Manager

2 Eng Vincent Odhiambo - Senior engineer, Projects Turnkey

Bidders Present

No Name Company/Firm

1 Zhu Xuhao Hydrochina

2. Victor Chore Efesk corp.

3. Stephen Mitau Airforce cooling systems

4. Samuel odila Siemens South africa

5. Suraj Prakash KEC Intl

6. Xie Xin Chint Electric

7. Michael sigwe Conco

8. Mark Kuka ABB

9. Madrin Maina Efesk Corp.

10. Rachit Shah Shreem Electric

11. John Angwenyi Cool Xtreme

12. Leah Muli Zhejiang Machinery

13. Moses W. Namasake ECI Eng & Const

14. Catherine Ahenda Snowpeak refrigeration

15. Peterson Maina Baording taupwei

16. A. Chockilingam Larsen & Toubro

Minutes

Min.1: Bidders advised that cancellation of earlier tender was occasioned by change of

substation site to plot within the Kengen compound at Turkwel.

Min.2: Bidders informed that the site visit will be conducted by themselves i.e. without

presence of KPLC engineers between dates of 25th

and 26th

October 2012.

The Chief engineer of Turkwel power station will be apprised of the Bidders visit.

Min3: Project manager ruled out possibility of extension of tender closing date.

Min.4

Matters arising from Bidders.

Q. Exact location of plot.

A. Clarification

Appendix 3 Minutes of Pre-Bid conference

The Project manager advised Bidders that i) the identified plot was not more than

300meteres from the existing Turkwel 220kV switchyard.

Meeting adjourned at 1130 am.

KE

Y

PRO

POSE

D 220K

V E

QU

IPME

NT

PRO

POSE

D 66K

V E

QU

IPME

NT

18

31

81

TX

1

75

MV

A

22

0/1

32

/12

.3kV

H2

1

H1

3

S4

4S

40

S4

8S

24

S2

0S

28

S3

4S

30

S3

8

L1

3

H2

3

H1

1

28

128

3

220 K

VL

11

Te

rtiary

=1

5M

VA

Te

rtiary

=1

5M

VA

TX

1

75

MV

A

22

0/1

32

/12

.3kV

LE

SS

OS

S/S

22

0 /1

32

KV

220 KV FROM TURKWEL P/STN.

FUT

UR

E E

QU

IPME

NT

(NO

T PA

RT

OF SC

OPE

)E

XIST

ING

EQ

UIPM

EN

T

H1

1

H1

3

1M

1

E1

S1

1S

1

L1

1

.5km

S3

8S

30

S3

4S

28

S2

0S

24

S4

8S

40

S4

4

L1

3

11

KV

BU

S B

AR

S

1M

0

ST

N T

X1

GE

N. T

X1

11

/23

4 K

V

59

MV

A

BR

1B

R2 1S

2

GE

N 3

ST

N T

X2

GE

N 2

GE

N. T

X2

11

/23

4 K

V

59

MV

AH

21

H2

3

2M

1

2M

0E1

S2

TU

RK

WE

LL 2

20 K

V

TU

RK

WE

LL

S/S

11

/ 22

0 K

V

58

.05

MV

A

Xd

"=1

8%

Xo

=2

2%

Xo

=2

2%

58

.05

MV

A

Xd

"=1

8%

S

S

YX=

12

%

d1

1N

YX=

12

%

d1

1N

45M

VA

220/6

6/1

1K

V T

x.

220K

VS/D

s

66K

VA

/Bs

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VS/D

s

22

0KV

A/B

s

22

0KV

S/Ds

22

0KV

A/B

s

22

0KV

S/Ds

KIT

ALE

22

0KV

A/B

s

66K

VS/D

s

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VA

/Bs

SP

AR

E

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VA

/Bs

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VA

/Bs

SP

AR

E 6

6K

V F

EE

DE

R

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VA

/Bs

22

0KV

E/S6

6kv

E/S

66K

VV

Ts

66K

VC

VTs

66K

VV

Ts

66K

VC

VTs

45M

VA

220/6

6K

V T

x.

220K

VS/D

s

66K

VA

/Bs

66K

VC

Ts66K

VC

B

66K

VA

/Bs

66K

VS/D

s

22

0KV

E/S6

6KV

E/S

FU

TU

RE

BA

Y ( N

OT

PA

RT

OF

SC

OP

E)

66K

VC

B

66K

VC

Ts66K

VC

Ts

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

KA

CH

ELIB

A/O

RT

UM

FE

ED

ER

66KV B.B 1

66KV B.B 2

DA

TESIG

N

CH

ECK

EDR

EFD

ESCR

IPTION

SIGN

DA

TEC

HEC

KED

CH

ECK

EDPR

INC

IPAL D

'MA

N

DR

AW

N

TRA

CED

05-09-2012S.M

.Kim

ani

7 6 5 4 3 2EN

GIN

EER I/C

1

PRO

POSED

SLD A

T KA

INU

K SU

B STA

TION

- WEST PO

KO

T

SIGN

L.Obalo

NA

ME

APPR

OV

ED

F. Kavita

Kenya Pow

er

SK N

o.11081

22

0KV

E/S

22

0KV

E/S

220K

V A

/Bs

220K

V A

/Bs

220K

V C

Ts

220K

V C

/Bs

220K

V A

/Bs

220K

V A

/Bs

220K

V C

Ts

220K

V C

/Bs

220K

V A

/Bs

220K

V A

/Bs

220K

V C

Ts

220K

V C

/Bs

220K

V A

/Bs

220K

V A

/Bs

220K

V C

Ts

220K

V C

/Bs

220K

V A

/Bs

220K

V A

/Bs

220K

V C

Ts

220K

V C

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

66K

VA

/Bs

220K

VA

/Bs

22

0KV

A/B

s

22

0KV

S/Ds

22

0KV

E/S

22

0KV

S/Ds

22

0KV

CV

TS

22

0KV

CV

TS

22

0KV

CV

TS

22

0KV

CV

TS

LO

KIC

HA

R 6

6K

V F

EE

DE

R

66K

VS/D

s

66K

VS/D

s

66K

VC

VTs

66K

VC

VTs

LO

KIC

HA

R

22

0K

V L

INE

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