Timer Relays Testing

Testing Procedures

  • Measure Relay Pick up & Drop off Voltage/current. 
  • Measure Relay Pick up & Drop off Timing.
  • Measure Relay Burden (Before & After Operation).
  • Measure Relay Contact Resistance.
Download: Auxiliary Test Result Format

Equipment Required

  1. Injection Kit (Sverker).
  2. Measurement Device (Multi-meter).
  3. Connection Cables (Banana Type). 
Picture
Sverker 760
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Multi-meter
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Connection Cables

Pick Up & Drop Off Test

  • Connection will be same as the shown figure.
  • Increase voltage until the relay picks up. Note down the pick up value for voltage & current.
  • Decrease voltage until the relay drops off. Note down the drop off value for voltage & current.
Picture
Connection Circuit

Pick Up & Drop Off Timing Test

  • For timing test we will use one pole of MCB series with Ammeter to cut dc supply off.
  • Use the other pole of MCB for starting sverker timer.
  • Use any contact from the aux. relay to stop sverker timer.
  • Inject 125V directly to the relay coil. Note down the pick up time.
  • Repeat previous step several times with different time delay.
  • Energize the relay with 125V then switch the supply off. Note down the drop off time.
Picture
MCB 2-Pole

Burden Test

  • Adjust the timer with high time delay for example: 2 minutes.
  • Energize the relay with 125V and measure the dc current. 
  • Note down the current before timer operates.
  • After 2 minutes relay will pick up. Note down the current after operation.
  • Calculate the relay power (W) = 125v x measured current