Year1
- 额定电压：
- 12KV
- 额定电流：
- 630A
- 额定频率：
- 50HZ
The inflatable cabinet is suitable for small secondary substations, switching stations, box-type substations, residential areas, industrial and mining enterprises, and large shopping malls in power systems. It is especially suitable for airports, Subways, railways and other places with higher power requirements.
Sulfur hexafluoride ring main unit structure:
The exterior is fully insulated and welded with fully sealed stainless steel materials. The interior is filled with gas.
Inflatable cabinet is a full name. It includes all unit cabinets. Commonly used ones are:
C unit: load switch module. Equivalent to the incoming line of the ring main unit.
Unit: load switch fuse combination module. Equivalent to the outlet of the ring main unit
Unit: vacuum switch module. Equivalent to a circuit breaker unit.
Unit: Cable connection module without grounding blade. Equivalent to lifting cabinet unit.
Other less commonly used ones include cabinets: metering modules. C or something. You need to install an expansion connector to use it.
Sulfur hexafluoride ring main unit
Features:
.Ring main unit refers to the load switch cabinet used for ring network power supply. The load switch cabinet can be used for ring network power supply, medium The voltage demarcation room distributes the power and the medium voltage terminal substation room supplies power. The load switch cabinet has a simple structure, low cost and small size. Most of them can be installed against the wall. Generally, they only have fuse protection but no relay protection.
.Partial load switch cabinets can be equipped with special vacuum circuit breakers, circuit breakers, or arc extinguishing methods such as compressed air, and the short-circuit breaking capacity is close to or reaching the level of switch cabinets.
.Ring main unit cabinets can be divided into air insulation and gas insulation according to the insulation structure.
.Generally composed of three intervals: a ring cable entry and exit interval and a transformer loop interval.
Sulfur hexafluoride ring main unit
Internal structure:
The ring main unit consists of four parts: switch room, fuse room, operating mechanism room and cable room (chassis).
The switch room is composed of various functional circuits (including grounding switches and load switches) sealed in a metal shell and the busbars between the circuits. The shell is welded by ㎜ cold-rolled steel plate (or stainless steel plate). Each functional circuit includes a load switch and grounding switch. The load switch is composed of a vertically moving moving contact system and a static contact at the lower end. When the switch is closed, the moving contact moves downward and the load switch is turned on. The grounding switch is composed of a moving contact blade and a static contact blade. During the movement of the spring, the grounding switch is quickly turned on. There are rectangular assembly process holes in the upper and rear parts of the switch room, and an observation window is installed on the front of the ring main unit, through which the "open" and "close" positions of the grounding switch can be seen. An explosion-proof device is installed at the rear of the ring main unit.
The load switch adopts a compressed air blow-in structure, which has strong arc extinguishing ability and does not affect the phase-to-phase and ground insulation. Both the dynamic and static contacts are equipped with arc contacts, which greatly increases the number of breaking times.
The fuse and the load switch chamber form a transformer protection circuit. The high-voltage current-limiting fuse is installed in an epoxy-cast insulating shell. After the fuse blows, the striker pops out and the load switch opens.
The operating mechanism room is located on the front of the ring main unit. In each functional circuit, the load switch is equipped with a human (or electric) energy storage spring operating mechanism, and the grounding switch is equipped with a human energy storage spring operating mechanism. There are opening and closing operation holes on the panel for the closing operation of the load switch, the manual opening rotary knob and the grounding switch respectively. The opening and closing position indicators of the load switch and the electric opening and closing buttons are also equipped with analog lines. , switch status display board and locking position, the operation of load switch and grounding switch has interlocking device to prevent misoperation.
Sulfur hexafluoride ring main unit
Advantages:
Solid insulated ring main unit realizes a new generation of maintenance-free, environmentally friendly, pollution-free, small size, safe, reliable and combined with intelligence The product, its single unit is wide, deep and high, can be used alone or combined in a cabinet. It is a perfect combination of vacuum technology and insulation technology. It completely replaces gas in terms of arc extinguishing and insulation performance. It complies with the national standards for electrical products to reduce waste gas. pollution requirements.
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