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GCK switchgear common faults and solutions
Release time:
2025-04-08
Author:
Source:
Abstract
GCK switchgear as a power system in the key equipment, although the design and manufacture of a variety of safety measures taken into account, but in the actual operation of some failures may still occur. The following are common failures of GCK switchgear and targeted solutions:
I. GCK switchgear internal short-circuit
Reason:
GCK switchgear busbar rows support insulating parts or inserted contact insulation base due to dirt, moisture or mechanical damage triggered by flashover discharge.
Treatment:
Regularly clean and dust the insulating parts of GCK switchgear, dry the damp parts, and replace the mechanically damaged insulating parts immediately.
Overheating at the busbar connection of GCK switchgear
Reason:
The busbar connection of GCK switchgear is not in good contact, or the bolts are not fastened properly (over-tightening leads to deformation of the cross-section, and over-loosening leads to an increase in contact resistance).
Treatment:
Check the busbar lapping surface of the GCK switchgear cabinet after power failure, recalibrate the bolt tightness to the spring washer flattening state, and replace the badly oxidised busbar if necessary.
Improper selection of electrical components of GCK switchgear
Reason:
Insufficient breaking capacity of circuit breaker or mismatch between current transformer capacity and load in GCK switchgear.
Treatment:
According to the load characteristics of GCK switchgear, select the circuit breaker with appropriate breaking capacity, and check the ratio and accuracy level of current transformer.
Risk of misoperation of GCK switchgear
Cause:
Operate the disconnecting switch with load or fail to strictly implement the ‘five preventive’ interlocking mechanism.
Treatment:
Strengthen the training of GCK switchgear operation to ensure that the mechanical interlocking devices (e.g. trolley position locking) function properly, and forcibly unlocking is strictly prohibited.
V. Hidden danger left behind in the maintenance of GCK switchgear
Cause:
The maintenance tools are left behind on the mother row of GCK switchgear, resulting in short circuit after power supply.
Treatment:
When carrying out GCK switchgear overhaul operation, tools must be counted and no leftovers must be checked in the cabinet, and the acceptance link must be double-confirmed.
GCK switchgear is invaded by small animals.
Reason:
The cable holes of the cabinet are not blocked tightly, which leads to short-circuit triggered by rats and other small animals entering the GCK switchgear.
Treatment:
Add metal protection net at the bottom of GCK switchgear cabinet, seal the cable layer with fireproof mud, and check the integrity of sealing regularly.
Mechanical failure of GCK switchgear
Reason:
The drawer unit is stuck, the gear of the operating mechanism is worn out or the transmission linkage is deformed.
Treatment:
apply grease to the guide rail of GCK switchgear cabinet, replace the deformed primary plug-in, and adjust the stroke of handcart propulsion mechanism.
Eight, GCK switchgear secondary circuit defects
Cause:
poor contact of auxiliary contacts or switching coil due to institutional jamming burned.
Treatment:
Regularly test the conductivity of the secondary circuit of the GCK switchgear, clean up the oxidised contacts, and replace the auxiliary switches that are not sensitive to action.
Prevention and Maintenance Suggestions
Regular inspection: Use infrared thermometer to monitor the temperature of the connectors of the GCK switchgear, and deal with the abnormality in time.
Environmental control: Keep the operating environment of GCK switchgear dry and install dehumidifying devices to prevent condensation.
Technology upgrade: install wireless temperature measurement system in GCK switchgear, real-time monitoring hotspots and early warning.
Standardised operation: Strictly implement the ‘five-proof’ interlocking process of GCK switchgear to avoid misoperation.
Through the above measures, the operational reliability of GCK switchgear can be significantly improved, the service life of the equipment can be extended, and the risk of unplanned shutdown can be reduced.
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