Safety Operating Procedures for High and Low Voltage Switchgear:
1. When working on fully or partially energized panels, the equipment under maintenance should be clearly separated from the operating equipment.
2. The secondary windings of current transformers and voltage transformers should have permanent and reliable protective grounding.
3. When working on the secondary circuit of an operating current transformer, the following safety measures should be taken:
(1) It is strictly forbidden to disconnect the current circuit.
(2) In order to reliably short-circuit the secondary coil of the current transformer, short-circuit plates and short-circuit wires must be used, and it is forbidden to use wires wrapped around it.
(3) No work is allowed 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, the following safety measures should be taken:
(1) Strictly prevent short circuits or grounding.
(2) Insulated tools and insulated gloves should be used, and relevant relay protection devices should be turned off before work if necessary.
(3) When connecting temporary loads, a dedicated switch and fuse must be installed.
(4) When the secondary circuit is energized, in order to prevent reverse voltage from the secondary side to the primary side, in addition to disconnecting the secondary circuit, the primary fuse should also be removed.
(5) Before energizing or testing the secondary circuit, the duty officer and relevant personnel should be notified, and someone should be assigned to guard the site, check the circuit, and pressurize only after confirming that no one is working.
(6) Personnel inspecting power outage protection and secondary circuits are not allowed to perform any switching operations without the permission of the on-duty personnel.
