Voice Note

Hardware Features of Universal Relay Test Kit K68i:

  • All-in-one design relay tester with 6.4 inches LCD display.

  • Four  independent AC voltage sources of 0- 300V @ 110VA each.

  • Three  independent current sources  of 0- 35A @ 450 VA each .

  • One independent Auxiliary DC Source of 0 ~ 300V/0.6A .

  • High accuracy analog outputs of <0.15%rd + 0.05%rg,Guar.

  • Projector compatible port for training & study purpose .

  • Rugged Design with super long life rotary encoder + Functional keyboard.

Software Features of Universal Relay Test Kit K68i:

  • Able to test most of Relays by manual or automation: Voltage relays, Current relays, Frequency relays, Power relays, Impedance relays, Harmonic relays, Distance relays etc .

  • With self-housing & grounding-detecting function

Relay Testing Kit – Theory

Protective relay is a device which maintains the power system equipments and gives an output under an abnormal condition to ensure protection of the system. The basic objective of the protective relay is to isolate the faulty section in a power system as quickly as possible so that rest of the system functions normally. It is necessary to ascertain security, reliability, quality, sensitivity and speed of relays.

Various tests are recommended in National and International Standards to check the withstand capacity of a relay during fault conditions. During testing, protective relay is made to undergo simulated field conditions to check its performance. The relevant National / International standards recommend many tests to ascertain the relays effectiveness to perform its intended function.


The relaying equipment is aided in this task by instrument transformers that sense power conditions and circuit breakers that are capable of disconnecting the faulty element when called upon by the relaying equipment.

Due to their critical role in the power system, protective relays should be acceptance tested prior to being placed in service and periodically thereafter to ensure reliable performance. In a normal industrial application, periodic testing should be done at least every 2 years in accordance with IEC/IS Standard . 

Relay Testing Kit – Theory

Relay is a switching device, which issues a trip command to the Circuit Breaker during abnormal fault conditions. A Relay receives the input signals from CT’s/ PT’s and its program calculates the fault conditions as per application. It issues a trip command to the Circuit Breaker on sensing a faulty condition.  

Step 1:

Relay Testing Kit injects fault in form of I & V on respective CT & PT points of Relay under test . The Timer of Relay Testing Kit starts by initiating  fault injection.

Step 2:

Relay senses the fault & issues the trip command, its trip timing must depend on the time characteristics of relay settings.

Step 3:

Relay Testing Kit receives the trip command from Relay & Stops the timer.

Step 4:

The measured tripping characteristics are compared with respect to expected tripping as per settings by Engineer.


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Theory of Relay Test Kit