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Transformer_Monitoring

Date post: 19-Jul-2015
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Nuratech Transformer Monitor O Introduction Electrical transformers constitut industries, replacing the electr proposition, as it requires a larg important to have the best mon transformer fleets are operated catastrophic failures. Why Transformer Monitoring? Detect likely Faults at an Avoid unscheduled outa Operate Transformer at Monitor Thermal ageing Manage & Increase the l Standard off-line diagnosis plays Shutting down the grid s System failure can occur Recording and maintaini Nuratech Solution Using Nuratech online monitorin helps in avoiding surprise failure ring Online Transformer Monitoring te the largest share of the investments in any util rical transformers frequently for better efficie ge capital investment. In this given scenario it b nitoring and control system to maintain the trans d beyond its designed life and with higher avera n early stage to take preventive action ages optimum performance level g & avoid critical hotspot temperatures life and the efficiency of the Transformer s a vital role. However, this has its own limitation supply during maintenance r before the scheduled maintenance without any ing error free history of every transformer over t ng system, these limitations can be easily handled es which could directly impact the business. Page 1 lity system. For most ency is not a viable becomes increasingly sformer. Globally, the age load resulting in ns such as; y warning the years d. Furthermore this
Transcript
Page 1: Transformer_Monitoring

Nuratech Transformer Monitoring

Online Transformer Monitoring

Introduction

Electrical transformers constitute the largest share of the investments in any utility system. For most

industries, replacing the electrical transformers frequently for better efficiency is not a viable

proposition, as it requires a large capital investment. In this given scenario it becomes increasingly

important to have the best monitoring and control system to maintain the transformer. Globally, the

transformer fleets are operated beyond its designed life and with higher av

catastrophic failures.

Why Transformer Monitoring?

� Detect likely Faults at an early s

� Avoid unscheduled outages

� Operate Transformer at optimum performance level

� Monitor Thermal ageing & avoid

� Manage & Increase the life and th

Standard off-line diagnosis plays a vital role. However, this has its own limitations such as;

� Shutting down the grid supply during maintenance

� System failure can occur before the scheduled maintenance without

� Recording and maintaining error free history of every transformer over the years

Nuratech Solution

Using Nuratech online monitoring system, these limitations can be easily handled. Furthermore this

helps in avoiding surprise failures which could directly impact

Nuratech Transformer Monitoring

Online Transformer Monitoring

Electrical transformers constitute the largest share of the investments in any utility system. For most

industries, replacing the electrical transformers frequently for better efficiency is not a viable

uires a large capital investment. In this given scenario it becomes increasingly

important to have the best monitoring and control system to maintain the transformer. Globally, the

transformer fleets are operated beyond its designed life and with higher average load resulting in

Detect likely Faults at an early stage to take preventive action

Avoid unscheduled outages

r at optimum performance level

Monitor Thermal ageing & avoid critical hotspot temperatures

rease the life and the efficiency of the Transformer

line diagnosis plays a vital role. However, this has its own limitations such as;

Shutting down the grid supply during maintenance

System failure can occur before the scheduled maintenance without any warning

Recording and maintaining error free history of every transformer over the years

Using Nuratech online monitoring system, these limitations can be easily handled. Furthermore this

helps in avoiding surprise failures which could directly impact the business.

Page 1

Electrical transformers constitute the largest share of the investments in any utility system. For most

industries, replacing the electrical transformers frequently for better efficiency is not a viable

uires a large capital investment. In this given scenario it becomes increasingly

important to have the best monitoring and control system to maintain the transformer. Globally, the

erage load resulting in

line diagnosis plays a vital role. However, this has its own limitations such as;

any warning

Recording and maintaining error free history of every transformer over the years

Using Nuratech online monitoring system, these limitations can be easily handled. Furthermore this

Page 2: Transformer_Monitoring

Nuratech Transformer Monitoring Page 2

Critical Transformer Data Display & Alarms

� Power parameters (Energy consumed, Voltage, Power Factor, Phase Angle, Current, KW,

KVAR, KVA)

� Tap oil & bottom oil temperature

� Hot spot temperature – as per IEC standard

� Bushing PF

� Core temperature

� HV & LV winding temperature

� Tap changer position

� OLTC stuck indication & oil level

� Cooling system efficiency

� Fans (On/Off)

� Fan failure status

� Pumps operation

� Moisture – oil & water activity

The alarms for any of the above parameters can be set as per user requirement.

The measures data is utilized for diagnosing the transformer efficiency using analytical derivations

based on IEC 60076-7.

The following diagnostic parameters can be inferred from the calculations;

� Real time load ability

� Winding hot spot temperature

� Ultimate tap oil temperature

� Oil circulation pump failure

� Online tan delta for bushing

� Cooling system efficiency

� Water activity

Page 3: Transformer_Monitoring

Nuratech Transformer Monitoring

Multiple Transformer Monitoring

Benefits of Nuratech Transformer M

System - level Benefits:

� Smart Loading assistance

� Transformer Life Management

� Cooling efficiency & Cooling Fan po

� Remote real-time monitoring

� True gas components ana

� Visualization of behaving trends by interpretable charts on various parameters

Diagnostics for proactive actions

� Avoid abrupt/premature failure

User - Level Benefits:

� Reduced Power Outage

� Decrease in Operational Cost

� Extended Transformer Life

� Safer Work Environment

� Effective Asset Management

� Step towards Unmanned Sub

Nuratech Transformer Monitoring

Multiple Transformer Monitoring

Transformer Monitoring System:

Smart Loading assistance

Transformer Life Management - Online Transformer ageing curve.

Cooling efficiency & Cooling Fan power control management

time monitoring

True gas components analyzer at site, in hourly basis

Visualization of behaving trends by interpretable charts on various parameters

agnostics for proactive actions

upt/premature failure

Decrease in Operational Cost

Extended Transformer Life

Safer Work Environment

Effective Asset Management

Unmanned Sub-stations

Page 3

Visualization of behaving trends by interpretable charts on various parameters-Enhanced

Page 4: Transformer_Monitoring

Nuratech Transformer Monitoring

Transformer life management

Nuratech Transformer Monitoring System input / output parameters:

Input from Transformer sensor

Voltage/current/phase TAP position

Winding temperature, oil temperature,

conservator temperature

Cooling fan operation status

Pressure relief valve status.

OLTC motor current & temperature

Bushing PF & Tan delta

Moisture sensor

Alarms, Monitoring, diagnosis & Actions

Alarms

Tap oil temperature

HV winding temperature

Load TAP changer

Moisture in oil

Moisture in paper

Diagnosis

Advanced Condition Monitoring

Condition Monitoring

Protection

Nuratech Transformer Monitoring

Nuratech Transformer Monitoring System input / output parameters:

Input from Transformer sensor Output displays of transformer

Voltage/current/phase TAP position Load/voltage/current/PF TAP position

Winding temperature, oil temperature,

Winding temperature& hotspot oil

temperature, conservator oil level

ing fan operation status Cooling sys efficiency& fan failure

us. Pressure relief valve status

temperature OLTC status

Bushing PF & tan delta online

Moisture in oil

& Actions:

Description Suggestive Actions

Monitoring - measured parameters

When the tap oil temperature

breaches threshold

Reduce load

Activate cooling banks

Check the hot spot temperature

When HV winding temperature

breaches threshold

Reduce load

Activate cooling banks

Check hot spot temperature

Fault in TAP changer process Check the TAP changer drive

Moisture in oil exceed limits in

ppm or percentage

Use transformer oil dry up

system

Moisture in paper exceed limits Use transfo

• Action Recomendations

• Data processing, analysis & expert visualization

Advanced Condition

• Trends & Data Display

• Alarm & Trip

Page 4

displays of transformer

Load/voltage/current/PF TAP position

temperature& hotspot oil

conservator oil level

sys efficiency& fan failure

Bushing PF & tan delta online

Suggestive Actions

cooling banks

the hot spot temperature

cooling banks

hot spot temperature

Check the TAP changer drive

se transformer oil dry up

transformer oil dry up

Action Recomendations

Data processing, analysis &

Trends & Data Display

Page 5: Transformer_Monitoring

Nuratech Transformer Monitoring Page 5

in ppm or percentage system

Transformer over load When load exceeds rating Share the load to another

transformer / stand by

Diagnosis – Derived Parameters

Hot spot temperature Temperature exceeds limits Reduce the load

Check the tap & bottom oil

temperature

Fan motor stage current When cooling system motor

current exceeds rated levels.

Check for any loose connections

in cables

Annunciation for cooling

system

Check for fan motor faults

Tan delta for bushing When bushing deteriorates Check the leakage current,

capacitance, power factor

Water activity When moisture in oil & paper

exceeds the limit

Dry up oil with dry up system

Transformer efficiency Operating efficiency drops

beyond rated efficiency

Conduct over all transformer

test

Over all transformer life Transformer life expectancy

reduces beyond rated life

Transformer maintenance

schedule to be practised

Using transformer as stand by

Key features:

S. No Parameters Description

1 Transformer efficiency Monitor,, analyze and calculate transformers voltage,

current, phase angle, power, power factor, loading

history of transformer, as per IEC models

2 Bushing Bushing tan delta test

3 Temperature

Capture winding and oil (top, middle & bottom)

temperature with +/- o.1 degree accuracy. Display oil &

winding temperature history

4 Cooling Monitor and analyze moisture in oil with +/- 2 per cent

accuracy

5 Tap changer Display tap position

6 Trip

Capture oil temperature, winding temperature, bucholz

relay, pressure relief valve, OLTC surge relay and

differential trip

7 Alarms Facilitate user to receive SMS/E-Mail for all the

monitored parameters

8 Web enabled monitoring enable user to view various parameters of transformer

and substation with real time monitoring

9 Gas analysis Measure and analyze seven dissolved gases with 2%

accuracy

Page 6: Transformer_Monitoring

Nuratech Transformer Monitoring Page 6

Technical Specifications:

S. No Parameter Description

1 Communication MODBUS RTU over RS 485, Ethernet, TCP/IP, GSM,

onboard GPRS modem

2 Power supply 110-240 VAC

3 Discrete inputs 24 optically isolated with common ground (5-12

VDC)programmable discrete input

4 Discrete output Potential free contacts 12 VDC relay with 7A 250 VAC

and 12A 120 VDC 17 Discrete outputs

5 Analog inputs Freely Programmable - Analog Inputs

6 Data logging & graphs

Every 5 seconds data logging time vs. hot spot

temperature, time vs. tan delta & current time Vs.

electrical parameters

7 Periodic alarms 24 programmable alarms for all parameters

8 Monitoring parameters Tap oil temperature winding temperature calculate hot

spot value tan delta for bushing

9 Electrical parameters Voltage, power factor, phase angle. I. KW. KVAR & KVA

10 Enclosure and mounting Power coated steel options - Panel - IP65

11 Alerts SMS on configured mobile numbers & e-mail:

password protected

12 Display Displays all tap positions, voltage, current & event

messages

13 Power quality Harmonics upto36