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Relevant issues about distribution box Release time:2017-09-26 16:57:17

1.Analysis of cause of failure switching-on of the circuit breaker

1 Solution for under-voltage coil not operating (normal voltage): change the under-voltage coil

2 Solution for failure operation of switching-on coil after pressing the switching-on button: replace the under-voltage coil.

3 Solution for poor contact of switching-on button: replace the

4 Solution for burnt down of fusible core of control loop: replace the fusible core after confirming that the control loop is normal without short circuit.

5 Solution for failure energy storage of circuit breaker: check control power voltage of the motor shall be ≥ 85% .

6 Control power voltage of the switching-on electromagnet shall be less than 85%. Solution: power voltage of switching-on electromagnet must be ≥ 85%.

7  Solution for damage of switching-on electromagnet: replace the switching-on electromagnet.

8 Solution for poor contact of secondary loop of the drawing circuit breaker: after removing the drawer circuit breaker, move to the “connecting” position. Check whether the secondary loop is connected reliably.

9  Solution for stop position at the universal changeover switch: rotate the switch to the left power transmission or the right power transmission。

2.Analysis for failure switching-off of main switch of the feeding cable cabinet

  1 Solution for poor contact of switching-off button: replace the switching-off button.

  2 Solution for burning down of switching-off coil: replace the switching-off coil.

3 Analysis for reverse rotation or failure rotation of main varmeter

1  The capacitance compensation power too high or advanced: adjust the capacitance compensation to  0.92-0.97.

2 Solution for incorrect phase sequence of feeding cable of transformer: re-adjust phase sequence.

3 Solution for normal current and voltage loop: replace with varmeter.

4. Analysis for failure automatic feeding of capacitance cabinet

1  Solution for failure wiring of current sampling signal wire: wire the current sampling signal wire.

2  Solution for burnt down of fusible core of the control: replace the fusible core.

3  Solution for too high voltage and over-voltage displayed by control: adjust over-voltage protection point.

4 Solution for low current and control display in advance: after increasing current, it operates automatically.

5 Solution for over-voltage display on the compensation instrument of the capacitance cabinet: set the voltage higher than actual voltage.

6  Solution for failure wiring of current sampling signal wire: wire the current sampling signal wire.

7 Solution for burning down of fusible core of compensation control instrument: replace the fusible core.

8 Solution for low current: after the current has been increased, further commission and handle.

 

5.Analysis for failure rotation of watt hour meter of the drawer outlet wire

1 Solution for checking poor contact of secondary plugs: adjust contact of the secondary plug.

2 Solution for normal voltage and current: replace the watt hour meter.

 

6. Analysis for failure automatic feeding of changeover of dual power

1 Solution for universal changeover switch switched to the automatic position: rotate the switch to the automatic position.

2 Solution for manual changeover switch not rotated to automatic position: rotate the manual and automatic changeover switch to the automatic position.

3 Solution for failure closure of over-voltage tripper: check whether the voltage is consistent with that of the tripper  V ≥ 85%.

4 Solution for failure closure of timely relay: check contacts  2#7# of the time relay are normal or not.

5 . Solution for failure resetting of shunt mechanism of circuit breaker: check whether mechanical interlocking is loosened or not, and if there is any blocking.

 

7. Analysis for power factor of the capacitance cabinet not above 0.9

1 Solution for lowered capacity of capacitor: replace capacitor.

2  Solution for failure power connection of partial loops: check, handle and replace.