Safety operation rules for high and low voltage switchgear

1. When working on all or part of the energized disks, the maintenance equipment and the operating equipment should be separated by obvious signs.

2. The secondary winding with current transformer and voltage transformer should have permanent and reliable protective grounding.

3. When working on the secondary circuit of the current transformer in operation, the following safety measures should be taken:

3.1 It is strictly forbidden to disconnect the current loop.

3.2 In order to reliably short-circuit the secondary coil of the current transformer, a short-circuit piece and a short-circuit wire must be used, and wire winding is prohibited.

3.3 It is forbidden to carry out any work on the loop and wire between the current transformer and the short-circuit terminal.

4. When working on the secondary circuit of the voltage transformer in operation, the following safety measures should be taken:

4.1 Strictly prevent short circuit or grounding

4.2 Use insulating tools, wear insulating gloves, and disable relevant relay protection devices before working if necessary.

4.3 When connecting temporary loads, special switches and fuses must be installed.

4.4 During the energization test of the secondary circuit, in order to prevent the reverse voltage from the secondary side to the primary, in addition to disconnecting the secondary circuit, the primary fuse should also be removed.

4.5 Before electrification or withstand voltage test of the secondary circuit, the duty officer and relevant personnel should be notified, and personnel should be sent to guard the site to check the circuit and confirm that no one is working before pressurization.

4.6 The staff who check the power-off protection and the secondary circuit are not allowed to perform any switching operation without the permission of the on-duty staff.