High-voltage Distribution Cabinet - Electrical Products For Power System Power Generation

High-voltage power distribution cabinets refer to electrical products used for on-off, control or protection in power generation, transmission, distribution, power conversion and consumption of power systems, with voltage levels ranging from 3.6kV to 550kV, mainly including high-voltage circuit breakers, high-voltage Isolation switch and grounding switch, high-voltage load switch, high-voltage automatic reclosing and sectionalizer, high-voltage operating mechanism, high-voltage explosion-proof power distribution device and high-voltage switch cabinet, etc. The high-voltage switch manufacturing industry is an important part of the power transmission and transformation equipment manufacturing industry and occupies a very important position in the entire power industry.

The power distribution cabinet has the functions of overhead incoming and outgoing lines, cable incoming and outgoing lines, and busbar connection.

The power distribution cabinet has the functions of overhead incoming and outgoing lines, cable incoming and outgoing lines, and busbar connection.

composition

The power distribution cabinet should meet the relevant requirements of GB3906-1991 "3-35kV AC metal-enclosed switchgear" standard. It consists of two parts: the cabinet body and the circuit breaker. It is composed of mechanism, secondary terminal and connection.

Cabinet material

1) Cold rolled steel plate or angle steel (for welding cabinet);

2) Aluminium-zinc steel sheet or galvanized steel sheet (for assembling cabinets);

3) Stainless steel plate (non-magnetic);

4) Aluminum plate ((non-magnetic).

functional unit

1) Main busbar room (generally the main busbars are arranged in two structures of "pin" shape or "1" shape)

2) Circuit breaker room

3) Cable room

4) Relay and instrument room

5) Small busbar room on the top of the cabinet

6) Secondary terminal room

In-cabinet components

1. Commonly used primary electrical components (main circuit equipment) in the cabinet are the following equipment:

Current transformer is referred to as CT [such as: LZZBJ9-10]

Voltage transformer is referred to as PT [such as: JDZJ-10]

Zero sequence transformer

Switchgear

Earthing switch [eg: JN15-12]

Lightning arrester (resistance-capacitance absorber) [such as: HY5WS single-phase type; TBP, JBP combined type]

Isolation switch [eg: GN19-12, GN30-12, GN25-12]

High voltage circuit breaker [such as: less oil type (S), vacuum type (Z), SF6 type (L)]

High voltage contactor [such as: JCZ3-10D/400A type]

High voltage fuse [eg: RN2-12, XRNP-12, RN1-12]

Transformer [such as: SC(L) series dry transformer, S series oil transformer]

High voltage live display [DXN-Q type, DXN-T type]

Insulation parts [such as: wall bushings, contact boxes, insulators, insulating heat shrink (cold shrink) sheaths]

Main bus and branch bus

High-voltage reactor [such as series type: CKSC and starter motor type: QKSG]

Load switch [eg: FN26-12(L), FN16-12(Z)]

High-voltage single-phase parallel capacitors [such as: BFF12-30-1], etc.

2. The main secondary components commonly used in the cabinet (also known as secondary equipment or auxiliary equipment, which refer to low-voltage equipment for monitoring, control, measurement, adjustment and protection of primary equipment) are commonly used in the following equipment:

Relays, watt-hour meters, ammeters, voltmeters, power meters, power factor meters, frequency meters, fuses, air switches, transfer switches, signal lights, resistors, buttons, microcomputer integrated protection devices, etc.