Safety measures for high and low voltage switchgear
Feb 21, 2021
The high and low voltage switchgear works on fully and partly charged panels, and the maintenance equipment and the operating equipment should be separated by obvious signs. The secondary windings with current transformers and voltage transformers should have a sexual and reliable grounding protection.
When the high and low voltage switchgear is working on the secondary circuit of the current transformer in operation, the following safety measures should be taken:
1. It is strictly forbidden to disconnect the current loop.
2. In order to reliably short-circuit the secondary coil of the current transformer, short-circuit strips and short-circuit wires must be used, and wire winding is prohibited.
3. It is forbidden to carry out any work on the circuit and wires between the current transformer and the short-circuit terminal.
4. When working on the secondary circuit of a voltage transformer in operation.
High and low voltage switchgear adopt the following safety measures:
1. Strictly prevent short circuit or grounding.
2. Insulated tools and insulated gloves should be used, and the relevant relay protection devices should be disabled before work if necessary.
3. When connecting a temporary load, a dedicated switch and fuse must be installed.
4. When the secondary circuit is energized, in order to prevent the reverse voltage transformation from the secondary side to the primary, in addition to disconnecting the secondary circuit, the primary fuse should also be removed.
5. Before the secondary circuit is energized or withstand voltage test, the attendant and related personnel should be notified, and someone should be sent to guard the scene, check the circuit, and confirm that no one is working before pressurizing.
6. The staff who check the power-off protection and the secondary circuit are not allowed to perform any switching operations without the permission of the personnel on duty.
The high and low voltage switch cabinet is a kind of electrical equipment. The external line enters the main control switch in the cabinet, and then enters the sub-control switch, and each branch is set according to its needs. Such as instrumentation, automatic control, motor magnetic switch, various AC contactors, etc., some also have high-voltage room and low-voltage room switch cabinets, with high-voltage busbars, such as power plants, etc., and some also have low-cycle protection for main equipment Load shedding.
