High and low voltage switchgear is actually the power distribution equipment used in the power supply system for power distribution, control, measurement and connection of cables. General power supply bureau, substation is done with high voltage switch cabinet, and then by the step-down transformer, low voltage side leads to the low voltage power distribution cabinets, low-voltage distribution cabinet to the electricity switchboard, control box and switch box, it is through the switch, circuit breaker, fuse, button, indicator lights, instrument, electrical, such as protection device assembly into a whole in meeting the requirements of the design features of power distribution device of the equipment. For short: high and low voltage switchgear. Below small make up on the analysis of the high and low voltage switchgear composition and technical operating standards.

Classification of high and low voltage switchgear:

1, low-voltage extraction switch cabinet

2. Ac low-voltage distribution cabinet

3. Metal armored removable switch cabinet

4, low-voltage fixed divider switch cabinet

5. High-voltage capacitor cabinet

6. High voltage switchgear

Technical operation standards for high and low voltage switchgear:

1. When working on all or part live disks, the overhaul equipment and operating equipment shall be clearly marked.

Ii. Measures shall be taken to prevent the equipment from breaking down during operation when drilling holes on the reprotection disc and other work with large vibration.Iii. The secondary windings of all current transformers and voltage transformers shall have permanent and reliable protective grounding.Iv. The following safety measures shall be taken for the secondary circuit operation of the reoperated ct:

1. Do not disconnect the current loop;

2. In order to reliably short circuit the secondary coil of ct, the short circuit plate and short circuit line must be used;

3. Do not work on the circuit and wire between current transformer and short circuit terminal;

4. Special personnel shall be assigned to monitor the work, and insulation tools shall be used to stand on the insulation pad, and permanent grounding in the circuit shall not be disconnected.

The following safety measures shall be taken when the voltage transformer works on the secondary circuit in operation:

1. Strictly prevent short circuit or grounding;

2, the use of insulation tools, insulation sleeve, if necessary before the work of the relevant relay protection device;

3. Special switches and fuses must be installed when connecting with temporary load;

4. When returning to the roadside power test for the second time, in order to prevent the secondary side reverse pressure change from the secondary side to the primary side, in addition to breaking the secondary circuit, the next cautery breaker should be taken;

5. Before the secondary loop is energized or the pressure-withstand test, the personnel on duty and related personnel should be notified and sent to take care of the site to check the circuit and confirm that no one is working before pressurizing.

6. The staff who check the power failure protection and secondary circuit shall not conduct any switching operation without the permission of the duty guard.

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