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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
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
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
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
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
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