I. what is high voltage load switch?

High voltage load switch is an electrical appliance between high voltage circuit breaker and high voltage disconnector. High voltage load switch is often used in series with high voltage fuse; Used to control power transformers. The high voltage load switch has a simple arc extinguishing device, so it can turn on and off a certain load current and overload current. However, it can not disconnect the short-circuit current, so it is generally used in series with the high-voltage fuse for short-circuit protection.

2、Classification of general high voltage load switch

1. Class EI general load switch: it is suitable for normal continuous feeding of distribution system and does not need frequent opening and closing operation.

2. E2 level general load switch: it is a general load switch that does not need to repair or repair the breaking parts of the main circuit, and other parts only need little maintenance during the expected service life. 3. E3 level general load switch: it is a general load switch with the ability to frequently open and close large current and close short circuit at high frequency.

4. M1 level general load switch: general load switch with 100 times (operation) mechanical life.

Class 5m2 general load switch: general load switch for special occasions with 50 times of extended mechanical life. III. general load switch with rated voltage below 40.5kV has the following breaking and closing capabilities:

(1) Rated active load breaking current is equal to rated current;

(2) Rated no-load transformer breaking current is equal to 1% of rated current

(3) The closed-loop breaking current of rated distribution line is equal to the rated current

(4) See the following table for rated cable charging breaking current and rated line charging breaking current;

(5) The rated short-circuit making current is equal to the rated peak withstand current.