Auxiliary Relays Testing

---

Testing Procedures

• Measure Relay Pick up & Drop off Voltage/current. 
• Measure Relay Pick up & Drop off Timing.
• Measure Relay Burden.
• Measure Relay Contact Resistance.

Download: Auxiliary Test Result Format

Equipment Required

1. Injection Kit (Sverker, Freja, .. etc).
2. Measurement Device (Multi-meter).
3. Connection Cables (Banana Type). 

Sverker 760

Multi-meter

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.

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.
• Energize the relay with 125V then switch the supply off. Note down the drop off time.

MCB 2-Pole

Burden Test

• Energize the relay with 125V and measure the dc current.
• Calculate the relay power (W) = 125v x measured current