Product description

XGN2- 12 box-type fixed AC metal-enclosed switchgear (switch cabinet for short) is based on the national standard GB3906 “3-35kV AC metal-enclosed Switchgear” standard, meets the domestic IEC298 standard, and meets the “five prevention” locking requirements proposed by the two parts.

Scope of application

This product is suitable for three-phase AC single bus, double bus, single bus with bypass system with rated voltage of 3.6-12kV, 50Hz and rated current of 630-3150A for receiving and distributing electric energy. It can meet the requirements of various types of power plants, substations (substations) and industrial and mining enterprises.

Model Meaning

Normal use environmental conditions

1. Ambient temperature: The upper limit is +40°C, the lower limit is -10°C, and the daily average value of saturated vapor pressure allowed to be stored and transported at -30°C is not more than 2.2x 10-3mpa, and the monthly average value is not more than 1.8x 10- 3mpa;
2. Relative humidity: the daily average value is not more than 95%, and the monthly average value is not more than 90%;
3. Altitude: below 1000m (when it exceeds 1000m, it can be produced in consultation with the manufacturer);
4. Seismic intensity: less than 8 degrees;
5. There is no place with fire, explosion hazard, serious pollution, chemical corrosion and severe vibration.

Normal use environmental conditions

(1) Main technical parameters of switchgear

(2) Technical parameters of main electrical equipment in the switch cabinet

a. Technical parameters of ZN28A-12 vacuum circuit breaker

Structural characteristics

The XGN2-12 switchgear is a metal enclosed box structure. The frame of the cabinet was originally designed by welding angle steel. Later,
it can also be a steel plate bending assembly structure developed by our company, which greatly increases the appearance and is easy
to organize. Production, shorten the production cycle. The cabinet is divided into a circuit breaker room, a busbar room, a cable room, a
relay room, etc., and the rooms are separated by steel plates.
(1). The circuit breaker room is in the lower part of the front of the cabinet. The rotation of the circuit breaker is connected with the
operating mechanism by the pull rod. The upper wiring terminal of the circuit breaker is connected with the upper isolating switch, and the
lower wiring terminal of the circuit breaker is connected with the current transformer, and the current mutual inductance The breaker is
connected to the busbar of the lower isolating switch, and the circuit breaker room is also equipped with a pressure release channel. If an
internal arc occurs, the gas can release the pressure through the exhaust channel.
(2). The busbar compartment is in the upper part of the back of the cabinet. In order to reduce the height of the cabinet, the busbars are
arranged in a product shape, supported by 7350N bending strength porcelain insulators. The busbars are connected to the upper isolating
switch busbar, and the adjacent two busbar chambers Can be isolated between.
(3). The cable room is at the rear of the lower part of the cabinet. The supporting insulator in the cable room can be equipped with a voltage
monitoring device, and the cable is fixed on the bracket. When the main wiring is a contact plan, this room is a contact room. The relay
room is in the front of the upper part of the cabinet. The indoor installation board can be installed with various relays. There are terminal
block brackets in the room. The door can be installed with secondary components such as indicating instruments and signal components.
The top can also be equipped with a secondary small bus.
(4). The operating mechanism of the circuit breaker is installed at the lower left position, and the upper part is the operating and
interlocking mechanism of the isolating switch. The switch cabinet is double-sided maintenance. The secondary components of the relay
room are inspected in front, the operating mechanism is maintained, the mechanical interlocking and transmission parts, and the circuit
breaker is inspected. The main bus and cable terminals are repaired at the back, and there are lights in the circuit breaker room and the
cable room. Below the front door is a grounded copper bus bar parallel to the width of the cabinet, with a cross section of 4 x 40mm2.
(5).Mechanical interlock: In order to prevent the disconnecting switch with load, prevent the circuit breaker from being switched on and
off by mistake, and to prevent the electric interval from being mistakenly entered; prevent the grounding switch from being switched on
when the power is on; prevent the switch with a grounding knife from being switched on, the switch cabinet adopts corresponding
machinery Interlock, the principle of action of mechanical interlock is as follows:
a. Power failure operation (operation-overhaul)
The switch cabinet is in the working position, that is, the upper and lower isolation switches and circuit breakers are in the closed state,
the front and rear doors have been locked, and are in live operation, and the small handle is in the working position. First open the circuit
breaker, and then pull the small handle to the “breaking lock” position. At this time, the circuit breaker cannot be closed. Insert the
operating handle into the operating hole of the lower isolation and pull it down from the top to the bottom to isolate and open the circuit
breaker. Position, remove the handle and insert it into the upper isolation operating hole, pull it down from the top to the upper isolation
opening position. Then take down the operating handle, insert it into the operating hole of the grounding switch, and push it from bottom
to top to make the grounding switch in the closed position. At this time, pull the small handle to the “overhaul” position. You can open the
front door first, take out the key behind the door and open the back door. After the power failure operation is completed, the maintenance
personnel will maintain and repair the circuit breaker room and the cable room.
b. Power transmission operation (overhaul-run)
If it has been overhauled, it needs to be powered on. The operating procedure is as follows:
Close the rear door, take out the key and close the front door, and move the small handle from the “inspection” position to the
“disconnecting lock” position. At this time, the front door is locked and the circuit breaker cannot be closed. Insert the operating handle
into the grounding switch operating hole, Pull down to make the grounding switch in the open position, remove the operating handle, and
then insert it into the operating hole of the upper isolation, push it from the bottom up to make the upper isolation in the closing position,
remove the operating handle, and insert the operation of the lower isolation In the hole, push from the bottom to the top to make the
bottom isolation in the closing position, take out the operating handle, and pull the small handle to the working position. At this time, the
circuit breaker can be closed

Product appearance and structure

1. Ontology structure

2. Door grounding circuit

3. Secondary cable installation

4. Rear door interlock assembly

5. Lighting

6. Support insulator

7. Overhead outlet assembly

8. Busbar room assembly

9. Relay room assembly

10. Assembly of front door components

11. Transmission assembly of upper

isolating switch with grounding knife

12. Operate the interlocking mechanism

13. Lower isolation switch drive assembly

14. Current transformer assembly

15. Vacuum circuit breaker drive

assembly (electrical operation)

16. Ground bus assembly

Figure 3 Outline structure drawing of XGN2-12Z bypass cable outlet cabinet

(With ZN28A series vacuum circuit breaker)