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The composition of the high-voltage switchgear
The switchgear has the functions of overhead inlet and outlet, cable inlet and outlet, bus connection and so on. It is mainly used in power plants, substations, petrochemical industry, metallurgical steel rolling, light industry and textiles, factories and mines, residential quarters, high-rise buildings and other different places.
Composition of high-voltage switchgear:
The switchgear should meet the relevant requirements of the "AC metal-enclosed switchgear standard", and is composed of two parts: the cabinet and the circuit breaker, and the cabinet is composed of shells, electrical components (including insulating parts), various mechanisms, secondary terminals and wiring.
1. Materials
1. Cold-rolled steel plate or angle steel (for welding cabinet);
2. Aluminum-zinc steel plate or galvanized steel plate (for assembling cabinets).
3. Stainless steel plate (non-magnetic).
4. Aluminum plate ((non-magnetic).
5. The functional unit of the cabinet
6. Main bus room (generally the main bus layout is according to the "product" shape or "1" shape two structures.)
7. Circuit breaker room
8. Cable room
9. Relay and instrument room
10. Small bus room on the top of the cabinet
2. Electrical components
1. The common primary electrical components (main circuit equipment) in the cabinet are as follows:
Current transformer abbreviated as CT [e.g. LZZBJ9-10]
Voltage transformer abbreviated as PT [e.g. JDZJ-10]
Grounding switch [e.g. JN15-12]
Surge arrester (resistor-capacitance absorber) [e.g.: HY5WS single-phase type; TBP, JBP combined]
Disconnectors [e.g. GN19-12, GN30-12, GN25-12]
High voltage circuit breaker [e.g. oil less type (S), vacuum type (Z), SF6 type (L)]
High Voltage Contactor [e.g. JCZ3-10D/400A]
High voltage fuses [e.g. RN2-12, XRNP-12, RN1-12]
Transformers [e.g. SC(L) series dry transformer, S series oil transformer]
High Voltage Live Indicator [DXN-Q Type, DXN-T Type]
Insulators [e.g. wall bushings, contact boxes, insulators, insulating heat shrink (cold shrinkable) sheaths]
High voltage reactor [e.g. series type: CKSC and starter type: QKSG]
Load switch [e.g. FN26-12(L), FN16-12(Z)]
High voltage single-phase shunt capacitors [e.g. BFF12-30-1] etc
The main secondary components commonly used in the cabinet (also known as secondary equipment or auxiliary equipment, refers to the low-voltage equipment that monitors, controls, measures, adjusts and protects the primary equipment), and the common equipment is as follows:
Power meter
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 and so on.
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