FKN12A-12/FJRB12A-12 Air Compressed Load Switch -- Fuse Combination Apparatus

Overview

FKN12-12D/T630-20 type indoor AC high-voltage load switch (hereinafter referred to as FKN12-12D 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 making and breaking load current, closed-loop current, no-load transformer and cable charging current, and making short-circuit current. The load switch equipped with an earthing switch can withstand short-circuit current.

FKRN12-12D/T125-31.5 type AC high-voltage load switch -- fuse combination apparatus is an indoor high-voltage switchgear that combines the FN12-12D load switch with the S□LAJ-12 (XRNT□-10) high-voltage current-limiting fuse.

It can reliably break any current up to short-circuit current; the load switch breaks the working current, the fuse breaks the short-circuit current, and together they break any overcurrent between the working current and the full short-circuit current. At the same time, the fuse causes the load switch to open through its striker.

Main Applications

FKN12A-12D air-compressed load switch and FKRN12A-12D series air-compressed load switch -- fuse combination apparatus are suitable for 12kV and below three-phase distribution systems, used for the control and protection of power equipment such as transformers, cables, and overhead lines; especially suitable for terminal substations and box-type substations in urban and rural power grids. They are also suitable for the control and protection of ring network and double-radial power supply units.

The FKN12A-12D series air-compressed load switch can make and break load current and overload current.

The FKRN12A-12D series air-compressed load switch -- fuse combination apparatus can make and break load current and overload current, and break line short-circuit current.

Structural Features

1. The load switch, earthing switch, fuse, and mechanism are on one frame, allowing flexible combination, compact structure, small volume, and convenient and simple installation;

2. The break is of straight-moving arrangement, with high dynamic and thermal stability current parameters, and the operation is completed in one action;

3. It has a static contact insulating cover, which structurally isolates the two phases, eliminating the need for inter-phase insulating barriers and break insulating insertion plates, and can prevent arc short-circuit accidents inside the cabinet;

4. It has a unique shutter structure. After the load switch is opened, the shutter automatically isolates the break, providing good protection performance;

5. There are reliable mechanical interlocks between the load switch and the earthing switch and fuse, meeting the "five preventions" requirements;

6. It has two forms: manual operation and electric operation with AC/DC dual-purpose operating power supply, facilitating the realization of the "three remote" requirements of the power system.

Operating Environment Conditions

1. Ambient air temperature: -25℃～+40℃;

2. Altitude not exceeding 1000m;

3. Relative humidity daily average not greater than 95%, monthly average not greater than 90%.

4. Earthquake intensity not exceeding magnitude 8;

5. Locations without fire, explosion hazard, chemical corrosion, or severe vibration;

6. Pollution level: Ⅱ.

Main Technical Parameters