Transformer Protection Simulation Experimental Unit

1. 3Ø /2KVA 3 phase Transformer set up

One number of 3 phase transformer with primary & secondary tapings is provided with following specification

• Input                                     :           0-230VAC  ( R phase ) with 25 , 50 ,75,100% tapping’s

:           0-230VAC  ( Y phase ) with 25 , 50 ,75 ,100% tapping’s

:           0-230VAC  ( B phase ) with 25 , 50 ,75 ,100% tapping’s

• Output                                     :           0-230VAC  ( R phase ) with 25 , 50 ,75 ,100% tapping’s

:           0-230VAC  ( Y phase ) with 25 , 50 ,75,100% tapping’s

:           0-230VAC  ( B phase ) with 25 , 50 ,75,100% tapping’s

• Capacity                                     :           2KVA
• Connection                                     :           STAR/DELTA
• Both Primary & secondary tapping’s are terminated in front panel for simulating fault

Power systems Protection Relays

This set up consists of the following relays to study the various protection using relays.

• One number of Over Current Relays &  Earth Fault Relays (MAKE C&S)
• One number of Over/under Voltage Relays (MAKE C&S)
• One number of 3 phase differential relay (MAKE C&S/PLI)

Relay specifications

• All Relays are digital & microcontroller based , PLI Make
• DMT & IDMT Mode of operation
• One numbers of ‘NC’ & ‘NO’ Contacts are provided in all relays
• LCD is provided to indicate the parameters
• Digital keys are provided to set the parameter
• Suitable CT & PT’s are provided for all relay’s for alternator matching
• CT & PT inputs are terminated in relays back side
• All relays CT Ratings are 1amp & All relays PT Ratings are 110V

Current Transformer & Potential Transformer

• Necessary Current Transformer (more than 6 numbers) with suitable ratings and PY &SY side matched with transformer & Relay rating
• Necessary Potential Transformer with suitable ratings and PY &SY side matched with with transformer & Relay rating
• All relays specification matched with transformer specification using CT/PT’s
• All are mounted on anice cabinet with necessary diagram indication

Meter panel with R loads.

• Three no. of ac digital ammeter provided for transformer primary current measurement.
• Three no. of ac digital ammeter provided for transformer secondary current measurement.
• Three no. of ac digital voltmeter provided for Transformer input voltage measurement.
• Three no. of ac digital voltmeter provided for Transformer output voltage measurement.
• One number of three phases Lamp load provided (2KVA) with diff-load selector switch.

Fault simulator & Trip time measurement set up

• One number 3 phase Autotransformer -2kva is provided to simulate the Over voltage & under voltage faults
• One number short circuit resistor with start & stop circuit using contactor is provided to simulate the short circuit faults  & earth fault
• One number of Automatic trip time measurement circuit (ATTM Circuit) is provided for Relay trip time measurement
  • One number START push button is provided in ATTM Circuit
  • One number STOP push button is provided in ATTM Circuit
  • One number Digital stop Clock is provided in ATTM Circuit to measure relay trip time
• All are mounted on a nice cabinet with diagram stickered front panel.
• 230VAC@50Hz AC Input with power ON/OFF Switch
• 3 phase 440vac input for transformer section

List of experiment

• Study and Testing of Over current relay in transformer protection system with DMT & IDMT relay Characteristics
• Study and Testing of Over voltage relay in transformer protection system with DMT & IDMT relay Characteristics
• Study and Testing of under voltage relay in transformer protection system with DMT & IDMT relay Characteristics
• Study and Testing of earth fault relay in transformer protection system with DMT & IDMT relay Characteristics
• Study and Testing of Differential relay in transformer protection system with DMT & IDMT relay Characteristics