I. Overview

FN12-12D/630-20 indoor AC high-voltage load switch is a three-phase high-voltage switchgear with a rated voltage of 12kV and a rated frequency of 50Hz. It is used for opening and closing load current, closed-loop current, no-load transformer and cable charging current, closing short circuit current. Load switches equipped with earthing switches can withstand short-circuit currents. Equipped with manual and electric motor operating mechanisms to facilitate the realization of the three remote control requirements of the power system.

FN12-12(R)D/125-31.5 indoor AC high-voltage load switch-fuse combination appliance is a combination of FN12-12D load switch and S□LAJ-12 (XRNT□-12) high-voltage current-limiting fuse. A common indoor high-voltage switchgear. It jointly breaks any overcurrent between the working current and the short-circuit current; the load switch breaks the working current, the fuse breaks the short-circuit current, and the fuse opens the load switch through the impactor. The equipped earthing switch can withstand short-circuit current. Equipped with manual and electric operating mechanisms. It is convenient to realize the three remote control requirements of the power system.

2. Scope of application

FN12-12D/630-20 indoor AC high-voltage load switch is a three-phase high-voltage switchgear with a rated voltage of 12kV and a rated frequency of 50Hz. It is used for opening and closing load current, closed-loop current, no-load transformer and cable charging current, closing short circuit current. Load switches equipped with earthing switches can withstand short-circuit currents.

The FN12-12(R)D/125-31.5 indoor AC high-voltage load switch-fuse combination appliance is an indoor high-voltage switchgear that combines the FN12-12D load switch and a high-voltage current-limiting fuse. It can break any current up to the short-circuit current, the load switch breaks the working current, the fuse breaks the short-circuit current, and jointly breaks any current between the working current and the short-circuit current. At the same time, the fuse separates the load switch through its striker. brake.

FN12-12(R)D is mainly used in urban power distribution stations and industrial electrical equipment that supply power to three-phase ring network terminals for load control and short-circuit protection. Since combined electrical appliances are more reliable in protecting transformers and other electrical equipment than circuit breakers, they are especially suitable for ring networks, dual-radiation power supply units and box-type substations.

◎When FN12-12 is installed in the load switch cabinet, the busbar connection is very convenient and does not require any bending or processing.

◎The breaking is carried out within the bell-shaped insulator, the free gas is restrained, and the interphase insulation will not be affected.

◎It has an isolation fracture when opening, and the obvious fracture can be seen through the observation window.

◎The use of transparent observation cover can enhance the dust-proof effect.

◎The operation sequence of load switch → grounding switch → cabinet door uses mechanical interlocking to meet the requirements to prevent misoperation.

3.normal usage conditions

Altitude ≤1000m

Ambient temperature: upper limit +40℃; lower limit -25℃; (storage and transportation allowed at -30℃)

Daily relative humidity average does not exceed 95%

The average monthly relative humidity does not exceed 90%

Earthquake resistance: earthquake intensity does not exceed 8 degrees

Places without severe vibration and impact, as well as fire, chemical corrosion, and explosion risks

Pollution level: Level II