Power distribution cabinet failure is mainly installed in the distribution cabinet of the various electrical components (circuit breakers, knife switches, fuses, instrument protectors, etc.) in the normal operation of the fault.
1. Distribution cabinet fault classification
Distribution cabinet failure mainly air circuit breaker tripping (over-current grounding), lack of phase operation, burn contacts, fuses, knife switches, circuit breakers and other electrical components burn out.
2. Distribution cabinet failure causes
Power distribution cabinet failure of the general reasons are:
Contact is not solid; electrical components to load ratio does not match; distribution cabinet short circuit; import and export and load does not match; distribution room three-phase load imbalance, electrical components are non-GB products.
3 distribution cabinet troubleshooting procedures
3.1 Troubleshooting
(1) observe the distribution cabinet instrument to see if it is high voltage phase loss or shunt trip, distinguish trip lines.
(2) after the protection of the action did not find the accident point after the test, allowing test power once, if re-action, should identify the cause, shall not be continuous transmission, is strictly prohibited unauthorized withdrawal from the protector.
(3) Most of the lack of a phase is caused by overcurrent, should make a record, measure the load of each phase, and make timely adjustments.
(4) The lack of two-phase should be carefully analyzed, the first judge is caused by over-current caused by a short circuit, and sometimes overload first burn one phase, due to continuous operation and burn a phase.
(5) Short-circuit will also occur in phase, when the two-phase lack of phase, we must carefully analyze the search.
Power distribution cabinet troubleshooting analysis picture 1
3.2 Troubleshooting
(1) When the single-phase phase loss, the replacement fuse or melt test sent once, success can be directly reply to the power supply.
(2) In the absence of two phases, all fuses or their melts may be removed, one of the two phases in question shall be electrified and the other electrified at the other end: in the absence of electricity, the failure may have been caused by Load, fuse or melt can be replaced to test the power transmission; if there is electricity at the bottom of the test, the fault may be caused by a short circuit, the line should be checked, to deal with the short-circuit fault, the test power.
3.3 troubleshooting procedures
Accordance with the standardization of work processes specifically for: Approval of troubleshooting and acceptance of the task to deal with the task → Before the meeting will be held to prepare materials, tools and equipment → Power outage work and permit work → Troubleshooting → work to resume and power transmission → After the class was held Will → data archiving.
4. Safety measures
4.1 to ensure the safety of organizational measures
Site investigation system, work ticket system (power outage), work permit system, work guardianship system (minimum 2 work-shift members), work discontinuity system, work termination and restoration of power transmission system.
4.2 ensure safe technical measures
Power outage (open the circuit breaker on the distribution cabinet, open the switchboard of the distribution cabinet), check the electricity (use the electroscope to test the electricity in phase), install the grounding wire, use the personal security wire, hang the sign plate, install Fences, and safety equipment before work inspection.
5. Other precautions
Power distribution cabinet troubleshooting is strictly prohibited for one person; distribution cabinet troubleshooting will be blackout operation, non-live operation; strictly implement the "two single, two votes, two cards," a person is strictly forbidden; use of unqualified safety equipment is strictly prohibited, Use of non-GB electrical components.
Copyright: This article is Shanxi Jin Tai Hang Technology Co., Ltd. original, reproduced must indicate the source and link.
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