Xgn66A-12 Box Type Fixed Metal Closed Switchgear

I. Overview:
XGN66A-12 box type fixed metal enclosed switchgear (referred to as switchgear) is used in 3.6, 7.2, 12 KV three-phase AC 50HZ series for receiving and distributing electric energy. It is especially suitable for frequent operation of urban integration. Its bus series is single bus. The switch cabinet meets the requirements of the national standard GB3906-2006 "3.6KV-40.5KV AC metal enclosed switchgear and control equipment" and the international standard IEC2271-200:2003, and has two "five-proof" locking functions.

The main switch of the switch adopts VS1-12 gymnastic mechanism series vacuum circuit breaker, and the disconnector adopts GN30-12 rotary disconnector series products.

II. Normal working environment:
Elevation: not more than 1000m; (Special 2000m, 3000m, 4000m)
Ambient temperature: +40 C, -25 C (special-25 C)
Relative humidity: daily average is not more than 95%, monthly average is not more than 90%.
Seismic Capability: <8 Degree
Saturated vapor pressure: the daily average is not more than 2.2 *10-3 Mpa, and the monthly average is not more than 1.8 *10-3 Mpa.
No fire, explosion, serious pollution, chemical corrosion and violent vibration place;
Surrounding environment: no fire, explosion, serious pollution, chemical corrosion and violent vibration place;
III. Structural characteristics:
XGN66A-12 box type fixed metal enclosed switchgear, cabinet skeleton welded by angle steel, cabinet is divided into circuit breaker room, bus room, cable room, power breaker room, etc., room and room is separated by steel plate.

The breaker room is in the front and lower part of the cabinet body. The rotation of the breaker is connected by the tie rod and the buckle mechanism. The upper terminal of the breaker is connected with the upper disconnector. The lower terminal Madman of the breaker is connected with the upper disconnector. The lower terminal Madman of the breaker is connected with the upper disconnector. The lower terminal Madman of the breaker is connected with the current interactor.

In order to reduce the height of the cabinet, the buses are arranged in one shape. The buses are connected with the Madman of the upper isolation switch, and the two adjacent cabinet buses can be isolated.
The bus room is behind the lower part of the cabinet body. The cable room pillar insulator can be equipped with a voltage monitoring device. The cable is fixed on the bracket. For the main connection scheme, the cabinet room is the connection cabinet room. The relay room is in front of the upper part of the cabinet.  Installation of various relays indoors

The lower position of circuit breaker is enlarged, and the upper left position is the operation and interlocking mechanism of disconnector. Switchgear for double-sided maintenance, the front repair relay in the secondary components, maintenance button mechanism, mechanical interlocking and transmission parts, maintenance circuit breaker. The rear maintains the main bus and cable terminal, and there are lights in the circuit breaker room and cable room.

1. Mechanical interlocking
 In order to prevent load-carrying disconnecting switch, mis-opening and mis-closing of circuit, mis-entering of live interval, preventing live-closing of grounding switch, preventing grounding knife closing, switch cabinet color with the corresponding mechanical interlocking.
The action principle of mechanical interlocking is as follows:
2. Blackout operation
The switch cabinet is in the working position, that is, the upper and lower disconnectors and circuit breakers are in the closing place, and the front and rear doors are locked and in live operation. At this time, the small handle plate is in the working position. After the circuit breaker, the small handle plate is moved to the position of interruption and closure ripple. At this time, the circuit breaker can not close. The operation handle is defeated and the isolated operation hole is pulled down from the top to the isolation opening position. The handle is taken down, and then inserted into the upper isolation operation hole from the top to the bottom, pulled up to the isolation, and then the handle is inserted into the block globally. Switch, push from the lower currency, so that the grounding switch is in the closing position, you can open the front door, take out the key behind the door to open the back door, power outage operation is completed, maintenance personnel to the circuit breaker and cable room maintenance and repair.