High voltage switch cabinet Composition and classification
1、 Composition of switch cabinet;
The switchgear shall meet GB3906-1991 《 3-35 kV AC metal enclosed switchgear Cabinet and Circuit breaker It is composed of two parts, with overhead incoming and outgoing lines Cable Incoming and outgoing lines, bus connection and other functions. The cabinet is composed of Housing, electrical components ( Including insulation ) , various mechanisms, secondary terminals and wiring, etc.
★ . Cabinet material : 1). Cold ligation steel plate or Angle steel ( For welding cabinet );
2) Aluminum coated zinc steel plate or galvanized steel plate ( For assembling cabinet ).
3). Stainless steel plate ( Nonmagnetic ).
4). Aluminum plate (( Nonmagnetic ).
★ . Functional unit of cabinet ：
1). Main bus room ( Generally, the main bus is arranged in the shape of "pin" or“ one ” Two structures of font 2). Circuit breaker room 3). Cable room 4). Relay and instrument room 5). Small busbar room on top of cabinet 6). Secondary terminal room
★ . Electrical components in the cabinet:
one Common primary electrical components (main circuit equipment) in the cabinet are as follows:
Current transformer CT [ For example: LZZBJ9-10]
Abbreviation of voltage transformer PT [ as :JDZJ-10]
Earthing switch [ as :JN15-12]
Lightning arrester ( Resistance capacitance absorber )[ as :HY5WS Single phase type ; TBP 、 JBP Combined type ]
Isolating switch [ as :GN19-12 、 GN30-12 、 GN25-12]
High voltage circuit breaker [ For example: less oil type (S) Vacuum type (Z) 、 SF6 type (L)]
High voltage contactor [ For example: JCZ3-10D/400A type ]
High voltage fuse [ For example: RN2-12 、 XRNP-12 、 RN1-12]
transformer [ as :SC(L) Series dry transformer S Series oil transformer ]
High voltage live display [GSN-10Q type ]
Insulator [ as : Wall bushing, contact box, insulator, insulation heat shrink ( Cold shrink ) sheath ]
Main bus and branch bus
High voltage reactor [ Such as series type :CKSC And starter type :QKSG]
Load switch [ as :FN26-12(L) 、 FN16-12(Z)]
High voltage single-phase shunt capacitor [ as :BFF12-30-1] wait
two Main secondary components commonly used in the cabinet (also called secondary equipment or auxiliary equipment, which refers to low-voltage equipment that monitors, controls, measures, adjusts and protects primary equipment) , Common equipment are as follows :
one relay two Watt hour meter three ammeter four voltmeter five Power meter six Power factor meter seven Frequency table eight Fuse nine air switch ten Change-over switch eleven Signal lamp twelve resistance thirteen Button fourteen Computer integrated protection device, etc.
