What is a high-voltage switchgear?
High-voltage power distribution cabinets can also be called high-voltage switchgear, is used for power generation, transmission, distribution, power conversion and consumption of electric power system to play the role of on-off, control or protection, the voltage level of 3.6kV ~ 550kV electrical products, including high-voltage circuit breaker, high-voltage isolation switches and ground switches, high-voltage load switches, high-voltage automatic reclosing and sectioning device, high-voltage operating mechanism, High-voltage explosion-proof power distribution devices and high-voltage switchgear and other categories. High-voltage switch manufacturing industry is an important part of the power transmission and transformation equipment manufacturing industry, in the whole power industry occupies a very important position.
High-voltage switchgear role:
Switchgear role is to break the high-voltage circuit, is the main equipment of high-voltage switchgear. Busbar and cable is to realize the role of connection, generally the busbar is connected with the system side, equivalent to the source of high-voltage, and then through the switch with the emergence of cable connection. The cable connects the load carried by the switch. Can be a transformer, can be a motor or other equipment.
Composition of high-voltage switchgear:
Switchgear should meet the GB3906-1991 "3-35kV AC metal-enclosed switchgear" standard relevant requirements, by the cabinet and circuit breaker two major components, with overhead in and out of the line, the cable in and out of the line, the busbar liaison and other functions. The cabinet is composed of shell, electrical components (including insulation), various mechanisms, secondary terminals and wiring.
Classification of high-voltage switchgear
Divided into metal-enclosed armored switchgear, metal-enclosed interval switchgear, metal-enclosed box switchgear and open switchgear.
(1) metal-enclosed armored switchgear (with the letter K to indicate) the main components (eg: circuit breaker, transformer, bus, etc.) are installed in the grounded with a metal partition separated by the compartment of the metal-enclosed switchgear. Such as KYN28A-12 high-voltage switchgear.
(2) metal-enclosed spaced switchgear (with the letter J to indicate) and armored metal-enclosed switchgear similar to the main electrical components are also installed in a separate compartment, but with one or more in line with a certain level of protection of non-metallic partitions. Such as JYN2-12 high-voltage switchgear.
(3) metal-enclosed box-type switchgear (with the letter X to indicate) switchgear enclosure for metal-enclosed switchgear. Such as XGN2-12 type high-voltage switchgear.
(4) open switchgear, no protection level requirements, part of the shell is open switchgear. Such as GG-1A (F) type high-voltage switchgear
High-voltage switchgear working principle
Generally high-voltage distribution cabinet is divided into: high-voltage inlet cabinet / PT metering cabinet / lightning arrester cabinet / busbar cabinet / transformer cabinet / cabinet / capacitance compensator cabinet high-voltage power inlet cabinet is the power supply from the power station over the first to come into the cabinet, and then After the feeder cabinet and distributed to the various power equipment or transformer.
High-voltage metering cabinet is to calculate the power consumption of electricity metering cabinet cabinet door to be sealed with lead by the Electricity Bureau sealed
Mother Union Cabinet: when the system has two power feeds, and the two standby each other, the need to connect the two main buses of the two power sources, connecting the two sections of the buses of the switchgear cabinet is called the mother Union Cabinet, Note: Mother Union Cabinet and the two feeds into the cabinet is generally prohibited from being closed at the same time
Capacitor Compensation cabinet: Compensate reactive power, improve power quality, reduce losses, and provide power distribution operation data.
Transformer cabinet: containing a 20 or 50KVA transformer, that is supplied to the substation's own power transformer.
Lifting cabinet: because the high-voltage cabinet is different from the low-voltage cabinet, high-voltage cabinets are larger than the electrical clearance of the low-voltage cabinet, in order to ensure the clearance, so we need to add a lifting cabinet (some lifting cabinets are also installed isolation switch)
Outlet Cabinet: the power supply from this cabinet output, generally has a break, isolation and a variety of protection functions (over-current, quick disconnect, over-voltage, under-voltage, zero sequence, differential, blocking), etc., according to the protected equipment, can be used as the power supply. etc., can be configured according to the needs of the protected equipment)
PT cabinet: voltage transformer cabinet, generally installed directly on the bus to detect the bus voltage and realize the protection function. Internal main installation voltage transformer PT, isolation knife, fuse and arrester, etc., through the voltage transformer for operating system to provide about 100v working power supply usually this high-voltage power distribution cabinet is using DC power control, is the high-voltage power distribution cabinet of the secondary control circuit power level -220V (DC 220V), and DC screen is to supply it with power.
When choosing to buy this high-voltage switchgear, be sure to pay attention to the cabinet materials, because the different materials, the overall price is not the same Oh, and in general, this switchgear is a whole set of a whole set, so in the purchase of the time and the businessman said that the size of you, or else do it out of the shipment back to find that can not be put, or other reasons, not only to the delay, but also to their own! Trouble. The above is about the role of high-voltage switchgear content, I hope to help you.