Guangzhou of Mechanical and Electrical Transmission and Distribution Engineering Technology Co., Ltd. has a contract of three, electrical and mechanical equipment installation engineering contracting three; south Authority issued Holds three, for repair, bearing four qualification test. Service telephone 186-2018-8358, Wu workers provide electrical room equipment (transformers, high voltage, low voltage cabinets, generators, lines and other equipment) preventive tests to detect maintenance services, high-voltage distribution cabinet should meet GB3906-1991 "3- 35 kV AC metal-enclosed switchgear "standard of the relevant requirements, the cabinet and the circuit breaker two major components, the cabinet by the housing, electrical components (including insulating parts), various institutions, secondary terminals and wires and other components . Cabinet material fold 1) cold rolled steel or angle (for welding cabinet); 2) aluminum zinc coated steel or galvanized steel (used to assemble cabinets); 3) stainless steel (non-conducting magnetic); 4) aluminum (( non-conducting magnetic). functional unit is folded 1) Main bus room (usually the main bus arranged by "goods" -shaped or "1" -shaped two structures) 2) circuit breaker compartment 3) cable chamber 4) relay and meter chamber 5) cabinet Top small bus chamber 6) Secondary terminal compartment cabinet components used inside a folded 1. electrical components (main circuit devices) commonly have the following equipment: current transformers referred to CT [eg: LZZBJ9-10] referred PT voltage transformer [eg: JDZJ-10] zero sequence transformer switchgear earthing switch [eg: JN15-12] arrester (RC absorber) [eg: HY5WS single-phase type; TBP, JBP combination] isolating switch [eg: GN19- 12, GN30-12, GN25-12] high voltage circuit breaker [eg: less oil type (S), vacuum-type (Z), SF6 type (L)] high voltage contactor [eg: JCZ3-10D / 400A type] high-voltage fuse device [eg: RN2-12, XRNP-12, RN1-12] Transformers [eg: SC (L) series dry type transformers, S Series oil change] high-voltage live display [DXN-Q type, DXN-T type] insulating member [ such as: wall bushing, contact boxes, insulators, thermal insulation (shrink) jacket] main bus and branch bus Reactors [such as tandem: CKSC and starter motor type: QKSG] load switch [eg: FN26-12 (L), FN16-12 (Z)] high-voltage single-phase shunt capacitor [eg: BFF12-30-1] etc. 2. cabinet commonly used are secondary elements (also known as the secondary device or auxiliary equipment, refers to a device to monitor, control, measuring, regulating and protecting low voltage equipment), common are the following devices: relays, meter, ammeter, voltmeter, power meter, power factor meter, frequency meter, fuses, air switch, switch, lights, resistors, buttons, microcomputer integrated protection device and so on.