Electrical Engineering Virtual Power Lab Experiments

Study of Over-Current Relay and Effect of PSM and TSM

Procedure

  1. Switch ON the power supply.
  2. Switch ON the MCB ON/OFF switch.
  3. Press the start button S1. Now start LED glows.
  4. Change the current value using current adjustment knob provided on the left side of the Relay setup module.
  5. After setting the fault current then press the stop button S2 and also press the reset button of the stop clock to make the displayed time to zero.
  6. Now press the start button S1. The stop clock starts counting and when relay trips, it stops counting. During the interval the disc in the relay will rotate.
  7. When the relay coil trips, the disc returns to the normal (original) position. Note down the relay current from the Relay-current meter and trip time from the stop clock.
  8. Repeat the above procedure from step 5 for various fault currents.

Observation

S.No. Plug Setting Multiplier Fault Current Setting Relay Fault Current Measured Relay Tripping Time Theoretical Relay Time
- - Amps Amps Sec. Sec.
1. . . . . .
2. . . . . .
3. . . . . .
n. . . . . .

Connection Diagram


Fig 7.1 Connection Diagram of Over-Current Relay

Video for experiment:




Experiment 7. To Study the over-current relay and the effect of PSM and TSM.
Video-2