Why does the enclosure of a low-voltage switchgear cabinet experience leakage current?
Release time:
2022-11-28
Source:
Why does the enclosure of a low-voltage switchgear cabinet experience leakage current? To prevent leakage-current-related safety accidents, it must maintain excellent dielectric properties at high frequencies, avoid surface reflection, block the propagation of microwave heating, resist corrosion for long-term use, and thereby prevent electric-shock incidents involving the enclosure.
Low-voltage switchgear Why does the cabinet enclosure experience electrical leakage?
Our low-voltage switchboards are generally assembled outdoors; although a portion are also assembled inside rooms. Some workers frequently report that, inside industrial plants, they sometimes experience electric shock when touching the enclosure of the low-voltage switchboard, prompting them to ask whether there is a problem with the equipment or whether the distribution box has deteriorated over time.
In fact, the occurrence of leakage current may be due to the grounding wire not being properly connected or the absence of a grounding device, which can lead to such leakage. It is not necessarily caused by aging of the weapon system’s casing; however, the possibility of wiring aging should still be considered, so a thorough inspection is essential to determine whether the issue stems from a missing grounding device or from aged wiring. In practice, the investigation will ultimately focus on the Miles unit: whenever leakage current is observed, it is crucial to identify the root cause so that appropriate corrective measures can be implemented. The extent of the leakage may vary, but as long as it is promptly addressed, there should be no major difficulties in resolving the problem. Low-voltage switchgear How can leakage current be addressed? If there is concern that leakage from the low-voltage switchgear enclosure could lead to unnecessary problems, specialized leakage-protection devices can be installed within the switchgear, or composite insulating materials can be used. These composite insulating materials offer high safety performance: they exhibit high grounding resistance and a high dielectric strength, effectively preventing leakage-related safety incidents. Moreover, they maintain excellent dielectric properties at high frequencies, do not reflect microwaves, inhibit the propagation of microwave heating, are corrosion-resistant for long-term use, and thereby help prevent electric shock accidents involving the enclosure.
Low-voltage switchgear Matters to be noted during operation
1. When working on all or partially energized panels, equipment and operating machinery must first be inspected and maintained, and clearly marked to indicate isolation.
2. Voltage transformers and the secondary windings of current transformers shall be provided with reliable grounding protection.
3. When working on the secondary circuit of a voltage transformer in operation, the following safety precautions shall be taken:
4. It is prohibited to disconnect the current circuit.
5. To reliably address short-circuit faults in the secondary electromagnetic coil of a voltage transformer, short-circuit fault clips and short distances must be used; winding of the transmission line is prohibited.
6. No work shall be performed on the control circuit or transmission lines between the voltage transformer and the short-circuit fault connection terminals.
7. Insulated tools shall be used, and insulated gloves must be worn; if necessary, the relevant relay protection shall be de-energized prior to work.
8. When connecting temporary loads, a dedicated power switch and circuit breaker must be provided.
9. During the energization test of the secondary circuit, to prevent reverse transformation from the secondary side to the primary side, in addition to disconnecting the secondary circuit, the next upstream circuit breaker should also be opened.
10. Prior to energizing the secondary circuit or conducting the AC withstand voltage test, maintenance personnel and relevant staff must be notified, and on-site supervision must be assigned. The control circuit must be inspected to confirm that no one is working before pressurization can proceed.
11. Verify that personnel responsible for power-off protection and secondary circuits are present; no switching operations shall be performed without the approval of authorized personnel.
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