On-line Transformer Monitoring System

Advantages of On-line Monitoring System (OMS) Guide Predictive maintenance against warranty cost Record all relevant values in a local database. Detection of incipient faults at an early stage Keep a track of thermal ageing. Advanced information is available to understand various trends and improve the management of possible overload conditions and critical hotspot temperatures Allows more efficient, profitable and controlled transformer exploitation.

Guide Predictive maintenance against warranty cost

Record all relevant values in a local database.

Detection of incipient faults at an early stage

Keep a track of thermal ageing.

Advanced information is available to understand various trends and improve the management of possible overload conditions and critical hotspot temperatures

Allows more efficient, profitable and controlled transformer exploitation.

Hardware Architecture of OMS Basically consists of 5 monitoring modules Base Body Module. Cooling system Module. OLTC Module. Bushings Module. In-tank Module.

Basically consists of 5 monitoring modules

Base Body Module.

Cooling system Module.

OLTC Module.

Bushings Module.

In-tank Module.

Base Body Module: Used to monitor vibration, strain and temperature of the body of the transformer at various location. Sensors used are: Strain Guage, PT 100, Accelerometers. Cooling System Module: Cooling system is responsible for transferring the heat generated inside the active parts of the transformer to the ambient cooling medium. Sensors used are: PT 100, optical encoders. In-tank Monitoring Module: This module is used do three different kinds of monitoring. Dissolved Gas Analysis Moisture in Oil Analysis Oil Temperature Analysis

Base Body Module: Used to monitor vibration, strain and temperature of the body of the transformer at various location.

Sensors used are: Strain Guage, PT 100, Accelerometers.

In-tank Monitoring Module: This module is used do three different kinds of monitoring.

Dissolved Gas Analysis

Moisture in Oil Analysis

Oil Temperature Analysis

Cooling System Module Cooling system is responsible for transferring the heat generated inside the active parts of the transformer to the ambient cooling medium. The following parameters are required to be monitored Temperature -- PT 100 Speed of the fan -- encoders and digital channels.

Cooling system is responsible for transferring the heat generated inside the active parts of the transformer to the ambient cooling medium.

The following parameters are required to be monitored

Temperature -- PT 100

Speed of the fan -- encoders and digital channels.

OLTC Module Sensors used in OLTC Module are : Accelerometers Power Transducers PT 100. Recordings of the tap changer position and the operating current help to determine the number of tap switching operations and the total switched current. OLTC failures are often dominated by mechanical faults in nature. Mechanical and control problems can be detected by measurement of Physical parameters and the power consumption of the OLTC drive

Sensors used in OLTC Module are :

Accelerometers

Power Transducers

PT 100.

Bushings Module Sensors used in this module are: Capacitance/inductance transducers High voltage transducers (0-50A) Current Transducers Oil Pressure Transducers Moisture in Oil Sensors Bushing failures occurs predominantly because of changing dielectric properties caused due to aging, oil leaks, design or manufacturing flaws, or the presence of moisture .

Sensors used in this module are:

Capacitance/inductance transducers

High voltage transducers (0-50A)

Current Transducers

Oil Pressure Transducers

Moisture in Oil Sensors

Tan δ monitoring Tan δ , also called as loss angle or Dissipation Factor testing, is a diagnostic method of testing the quality of insulation. In case of perfect insulation , the voltage and current are phase shifted by 90 degrees . If there are impurities in the insulation, the resistance of the insulation decreases, resulting in an increase in resistive current . The current and voltage will no longer be shifted 90 degrees. The extent to which the phase shift is less than 90 degrees is indicative of the level of insulation contamination .

Tan δ , also called as loss angle or Dissipation Factor testing, is a diagnostic method of testing the quality of insulation.

In case of perfect insulation , the voltage and current are phase shifted by 90 degrees .

If there are impurities in the insulation, the resistance of the insulation decreases, resulting in an increase in resistive current .

The current and voltage will no longer be shifted 90 degrees.

The extent to which the phase shift is less than 90 degrees is indicative of the level of insulation contamination .

In-tank Monitoring Module Dissolved Gas Analysis (DGA). Moisture in Oil Transducers. PT100 for monitoring temperature of oil at various location.

Dissolved Gas Analysis (DGA).

Moisture in Oil Transducers.

PT100 for monitoring temperature of oil at various location.

Faults identified by DGA

Distribution and Visualization of Monitoring Data. Can also be done over GPRS or GSM network.

NI Hardware configuration* * Typical configuration for large transformers 1 TPC 2006 (Touch Panel Computer) HMI 4 cRIO 9481 (Relay Module) 1 cRIO 9263 (Voltage Output Module) 2 cRIO 9265 (Current Output Module) 1 cRIO 9221 (Analog Input Module) 1 cRIO 9104 (Chassis 8-slot) 1 cRIO 9004 (Embedded Controller) 2 nd Set 1 cRIO 9425 (Digital Input Module) 3 cRIO 9237 (Strain Gauge Module) 1 cRIO 9233 (Analog Input Module) 3 cRIO 9203 (Current Input Module) 1 cRIO 9104 (Chassis 8-slot) 1 cRIO 9004 (Embedded Controller) 1 st Set

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