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These series are especially applicable in rural, urban terminal substation and prefabricated substations, as well as ring network power supply.FKN12A-12D Series air-blast load break switch can break and make load current and over-current.FKRN12A-12D Series air-blast load break switch can break and make over-current, load current and short-circuit current(limited current fuse).This product is featured with impact structure, aesthetic appearance reliable interlock and high insulating level. In the spring storage operating mechanism, ON/OFF speed is free from the influence of the manpower. For the arc-extinguish electric arc-extinguish inside the insulating cover, the free gas occurs at sparking do not cause descend of insulating level between phases and phase to earth. The insulating cover clapboard separates electrified part thus boost protection grade of ring main unit. The copper-tungsten contact and main contact brings along reliable conductivity and long life. This product achieves sound fame due to easy maintenance and operations as well as reliable performance. It is in compliance with per IEC62271-105.
Ambient temperature-25ºC-+40ºC
Elevation≤1000m
Humidity; daily average humidity≤95%, monthly≤90%
The earthquake does not exceed degree 8
No fire, explosion, chemical errosion
Pollution: level 2
Load switch, ground switch, fuse and mechanism on a frame, flexible combination, compact structure, small size easy to install.
The fracture is arranged in direct motion, the dynamic and thermal stable current parameters are high, and the operation is completed at one time.
With static contact insulation cover, the ring network cabinet is isolated in the structure, eliminating the insulation partition between the phase and the fracture insulation board, and can prevent the internal arc short circuit accident.
With a unique valve structure, after the load switch is opened, the valve will automatically isolate the fracture, and the protection performance is good.
There is a reliable mechanical locking device between the load switch and the ground switch and the fuse, which meets the requirements of "five defenses".
It has two forms of manual operation and electric operation of AC and DC dual operation power supply, which is convenient to realize the "three remote" requirements of power system.
| Name | Unit | Data | |||
| Rated voltage | KV | 12 | |||
| Rated frequency | Hz | 50 | |||
| Rated current | A | 630 | |||
| Rated insulation level | 1min power frequency withstand voltage | Phase to phase, to earth | KV | 42 | |
| Isolation fracture | 48 | ||||
| lightning impulse withstand voltage (peak) | Phase to phase, to earth | 75 | |||
| Isolation fracture | 85 | ||||
| Rated short-time withstand current | Load switch | KA | 20 | ||
| earthing switch | 20 | ||||
| Rated short-circuit duration | Load switch | S | 4 | ||
| earthing switch | 2 | ||||
| Rated short-circuit closed current(peak) | KA | 50 | |||
| Rated breaking current | active load breaking current | A | 630 | ||
| closed-loop breaking current | 630 | ||||
| 5% active load breaking current | 31.5 | ||||
| cable charging current | 10 | ||||
| capacity of no-load transformer for breaking | KVA | 1250 | |||
| Rated short-circuit breaking current(Current limiting fuse) | KA | - | |||
| Rated transfer current | A | - | |||
| Mechanical life | times | 2000 | |||
| The impactor outputs energy | J | - | |||
