The FKN12 - 12D/T630 - 20 indoor AC high-voltage load switch (hereinafter referred to as FKN12 - 12D load switch) is a three-phase high-voltage switching device with a rated voltage of 12KV and a rated frequency of 50HZ. It is used to switch on and off load current, loop current, no-load transformer and cable charging current, and close short-circuit current. The load switch equipped with a
grounding switch can withstand short-circuit current. The FKRN12 - 12D/T125 - 31.5 AC high - voltage load switch - fuse combination device is an indoor high - voltage switching device formed by combining the FN12 - 12D load switch with the S□LAJ - 12 (XRN[T - 10) high - voltage current - limiting fuse.
It can reliably interrupt any current up to short-circuit current; the load switch interrupts the working current, the fuse interrupts the short-circuit current, and they jointly interrupt 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.
The FKN12A-12D pneumatic load switch and the FKRN12A-12D series pneumatic load switch - fuse combination device are suitable for three-phase power distribution systems below 12KV. They are 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 networks and dual-radiation power supply units.
The FKN12A-12D series pneumatic load switch can switch on and off the load current and overload current.
The FKRN12A-12D series pneumatic load switch - fuse combination device can switch on and off load current, overload current, and interrupt line short-circuit current.
Ambient air temperature: - 25℃ ~ + 40℃;
Altitude not exceeding 1000m;
The daily average relative humidity is not greater than 95%, and the monthly average is not greater than 90%.
Seismic intensity not exceeding 8 degrees.
Places without fire, explosion hazards, chemical corrosion, and severe vibration;
Pollution level: Ⅲ.
The load switch, grounding switch, fuse, and mechanism are on one frame, which can be flexibly combined. The structure is compact, the volume is small, and the installation is convenient and simple.
The fracture is arranged in a direct-acting manner, the dynamic and thermal stable current parameters are high, and the operation can be completed at one time.
It has a static contact insulating cover, which realizes isolation in the structure of the ring network cabinet, eliminating the need for phase - to - phase insulating partitions and fracture insulating inserts, and can prevent arc short-circuit accidents in the cabinet.
It has a unique live door structure. After the load switch is opened, the live door automatically isolates the fracture, and the protection performance is good.
There is a reliable mechanical interlocking device between the load switch, grounding switch, and fuse, meeting the "five prevention" requirements.
It has two forms: manual operation and electric operation with an AC/DC dual-purpose operating power supply, which is convenient for realizing the "three-remote" requirements of the power system.
