RTK ( K3063i)
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Unique Proposition:

  • High Power Rating & High Current Rating

  • Ideal for testing of High Buden Electro-mechanical Relays

  • Light Weight & State Of Art Design (17KG Only)

  • State of Art Software (With all advance features) for testing Numerical Relays

 

 

Hardware Features of Universal Relay Test Kit (K3063i):

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

  • Six  independent current sources  of 0- 32A @ 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.

  • Suitable for testing of Numerical as well as electro-mechanical relays

Software Features of Universal Relay Test Kit (K3063i):

  • Highly advance software with specialized modules for testing of Distance , Differential ,Over Current, Autoreclose , Synchoniser ,Power Swing ,df/dt functions etc.

  • Graphical test modules and templates with editing function.

  • Point & Click testing

  • Shot,Search & Check Test Option

  • RIO/XRIO import and export facility

  • GPS sync end-to-end testing

  • Energy Meter Testing , Transducer calibration, V/I  Measurement  and Transient Recorder (Optional).

Theory of Relay   

Protective relays are used extensively across the power system to remove any element from service that suffers a short circuit, starts to operate abnormally or poses a risk to the operation of the system.

 

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.

 

Electromechanical Relay Testing

 

The secondary of current transformer is connected to the current coil of relay. The secondary of voltage transformer is connected to the voltage coil of the relay. Whenever any fault occurs in the feeder circuit, proportionate secondary current of the CT will flow through the current coil of the relay due to which mmf of that coil increases. This increased mmf is sufficient to mechanically close the normally open contact of the relay. This relay contact actually closes and completes the DC trip coil circuit and hence the trip coil is energized. The mmf of the trip coil initiates the mechanical movement of the tripping mechanism of the circuit breaker and ultimately the circuit breaker is tripped to isolate the fault.

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