Problem one: The circuit breaker trips (the fault indicator lights) may cause the reason and check the elimination method: A. Overload fault trip (long delay indicator light) 1. Check the breaking current value and operating time on the intelligent release: 2. Analyze load and power grid operation; 3. If it is confirmed that the overload should be immediately found and troubleshooting; 4. If the actual operating current does not match the long-delay operating current, modify the long-delay operating current setting according to the actual operating current to properly match the protection. 5. Press the reset button to switch the circuit breaker back on.
B. Short-circuit fault trip (short delay or momentary indicator light) 1. Check the breaking current value and operation time on the intelligent release; 2. If it is confirmed that the short circuit should be immediately found and troubleshooting; 3. Check the intelligent release settings; 4. Check that the circuit breaker is in good condition and determine whether the breaker can be closed. 5. Press the reset button to switch the circuit breaker back on.
Problem two: Circuit breaker tripping may cause reasons and check exclusion method: A. Ground fault trip (ground fault indicator is lit) 1. Check the breaking current value and operation time on the intelligent release; 2. If it is confirmed that there is a ground fault, it should be immediately found and troubleshooting; 3. If there is no ground fault, please check whether the ground fault current setting value is appropriate and whether it matches the actual protection; if the setting is not appropriate, the ground fault current setting value should be modified; 4. Press the reset button to switch the circuit breaker back on.
B. Undervoltage release trip, mechanical interlocking action 1. Check if the power supply is lower than 70% Ue; 2. Check if the undervoltage release and the control unit have failed; check the operating status of the two circuit breakers with mechanical interlock.
Problem 3: The circuit breaker cannot be closed. Possible causes: A. Undervoltage release does not pick up 1. Check if the power supply voltage is lower than 70% Ue; 2. Check whether the undervoltage release and the control unit are faulty. If the fault is confirmed, replace the undervoltage release.
B. The reset button is not reset Press the reset button to reclose the breaker.
C. Drawer-type circuit breaker does not roll in place. Shake the drawer circuit breaker in place (shall have two clicks)
D. The secondary circuit of the drawer circuit breaker is in poor contact and the contact condition of the secondary circuit is checked and eliminated.
E. The circuit breaker is not pre-energized. Check the motor control power must be greater than or equal to 85%Us;2. Check if the motor energy storage mechanism is faulty.
F. Mechanical interlocking action, the circuit breaker is locked and the mechanical interlock status of the two circuit breakers is working.
G. Energy release electromagnet problem 1. Check that the power voltage of the energy release solenoid must be greater than or equal to 85%Us;2. If there is a problem with the release magnet, it should not be replaced.
Problem 4: The tripping may occur after the circuit breaker is closed: A. Immediate trip, delay trip 1 If there is a short circuit current in the circuit when it is possible to close, the fault should be found and eliminated. 2. If there is overload current in the circuit, trouble should be found and eliminated; 3. Have to check the circuit breaker in good condition; 4. Check whether the intelligent trip unit setting value is reasonable, unreasonable to re-set; 5. Press the reset button to switch the circuit breaker back on.
B. Short-circuit fault trip (short delay or momentary indicator light) 1. Check the breaking current value and operation time on the intelligent release; 2. If it is confirmed that the short circuit should be immediately found and troubleshooting; 3. Check the intelligent release settings; 4. Check that the circuit breaker is in good condition and determine whether the breaker can be closed. 5. Press the reset button to switch the circuit breaker back on.
Problem two: Circuit breaker tripping may cause reasons and check exclusion method: A. Ground fault trip (ground fault indicator is lit) 1. Check the breaking current value and operation time on the intelligent release; 2. If it is confirmed that there is a ground fault, it should be immediately found and troubleshooting; 3. If there is no ground fault, please check whether the ground fault current setting value is appropriate and whether it matches the actual protection; if the setting is not appropriate, the ground fault current setting value should be modified; 4. Press the reset button to switch the circuit breaker back on.
B. Undervoltage release trip, mechanical interlocking action 1. Check if the power supply is lower than 70% Ue; 2. Check if the undervoltage release and the control unit have failed; check the operating status of the two circuit breakers with mechanical interlock.
Problem 3: The circuit breaker cannot be closed. Possible causes: A. Undervoltage release does not pick up 1. Check if the power supply voltage is lower than 70% Ue; 2. Check whether the undervoltage release and the control unit are faulty. If the fault is confirmed, replace the undervoltage release.
B. The reset button is not reset Press the reset button to reclose the breaker.
C. Drawer-type circuit breaker does not roll in place. Shake the drawer circuit breaker in place (shall have two clicks)
D. The secondary circuit of the drawer circuit breaker is in poor contact and the contact condition of the secondary circuit is checked and eliminated.
E. The circuit breaker is not pre-energized. Check the motor control power must be greater than or equal to 85%Us;2. Check if the motor energy storage mechanism is faulty.
F. Mechanical interlocking action, the circuit breaker is locked and the mechanical interlock status of the two circuit breakers is working.
G. Energy release electromagnet problem 1. Check that the power voltage of the energy release solenoid must be greater than or equal to 85%Us;2. If there is a problem with the release magnet, it should not be replaced.
Problem 4: The tripping may occur after the circuit breaker is closed: A. Immediate trip, delay trip 1 If there is a short circuit current in the circuit when it is possible to close, the fault should be found and eliminated. 2. If there is overload current in the circuit, trouble should be found and eliminated; 3. Have to check the circuit breaker in good condition; 4. Check whether the intelligent trip unit setting value is reasonable, unreasonable to re-set; 5. Press the reset button to switch the circuit breaker back on.
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