LAB7.docx - POWER SYSTEM PROTECTION SWITCHGEAR LAB ASSIGNMENT 07 SURABHI RAMAN 17BEE0029 Aim To test the ACB with different current setting and to plot

LAB7.docx - POWER SYSTEM PROTECTION SWITCHGEAR LAB...

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POWER SYSTEM PROTECTION & SWITCHGEAR LAB ASSIGNMENT - 07 SURABHI RAMAN 17BEE0029
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Aim: To test the ACB with different current setting and to plot IDMT Characteristics Apparatus required 1. ACB Test kit 2. Wires Precautions 1. Keep the MCB is in off condition 2. Keep the Power ON/OFF Switch is in off condition 3. Keep the Autotransformer is in Minimum Position 4. Check the ACB SPRING CHARGE STATUS in ACB front panel, the correct status is ACB is fully charged & ‘ON’ Condition (Refer procedure in page number 25 ), in this condition the breaker input & output indicator is in “ON” condition. If not manually ON the ACB using procedure in page number 25 Procedure 1. Set the pick-up value of the current marked 2.5 A by inserting the plug in the groove. 2. Set the Time Multiplier Setting (TMS) initially at 1.0. 3. Switch ON the MCB 4. Switch ON the Power using Power ON/OFF Switch (IRS SWITCH) 5. Press the START Button 6. Apply current of 5A (Indicate the front panel ammeter) by Adjusting the Front panel Autotransformer – (Now the disc in over current relay is rotate and relay may trip – but don’t consider this function) 1. Now the fault current of 5A is set 2. Press Manual STOP Button
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3. Now the set up is ready for applying Fault current of 5A 4. Wait for some time to settle the DISC in over current relay in initial / home position 7. After the disc settling in home position in relay then Press the START Button 8. Now the DISC in RELAY is start to rotate and relay is tripped after some time 9. Once the RELAY is tripped the following operation is automatically done a. ACB is tripped b. ACB Output indicator is Switched “OFF’ c.
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