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With the constant changes of the times, our living standards are constantly improving. Today, we are going to talk about the high-voltage switchgear with everyone. What is the high-voltage switchgear? What is the role of the high voltage switchgear? If you don't know, just follow me to find out.
What is a high voltage switchgear?
High-voltage power distribution cabinets can also be called high-voltage switchgears, which are electrical products used for power system power generation, transmission, power distribution, power conversion and consumption, such as switching, control or protection. Voltage grades range from 3.6kV to 550kV. It mainly includes high-voltage circuit breakers, high-voltage isolating switches and grounding switches, high-voltage load switches , high-voltage automatic reclosing and sectionalizers, high-voltage operating mechanisms, high-voltage explosion-proof power distribution devices and high-voltage switchgears. The high-voltage switch manufacturing industry is an important part of the power transmission and transformation equipment manufacturing industry and plays a very important role in the entire power industry.
The role of high voltage switchgear:
The function of the switchgear is to break the high-voltage circuit and is the main equipment of the high-voltage switchgear. The busbar and the cable are connected. In general, the busbar is connected to the system side, which is equivalent to the source of high voltage, and then connected to the cable through the switch. The load carried by the cable connection switch. It can be a transformer, it can be a motor or other device.
The composition of the high voltage switchgear:
The switchgear should meet the relevant requirements of GB3906-1991 "3-35 kV AC metal-enclosed switchgear" standard. It consists of two parts: the cabinet and the circuit breaker. It has the functions of overhead access line, cable entry and exit line, and bus connection. The cabinet is composed of a casing, electrical components (including insulation), various mechanisms, secondary terminals, and wiring.
Classification of high voltage switchgear
It is divided into metal-enclosed armored switchgear, metal-enclosed bayonet switchgear, metal-enclosed box switchgear and open switchgear.
(1) Metal-enclosed armored switchgear (represented by the letter K) The main components (eg, circuit breakers, transformers, busbars, etc.) are respectively enclosed in a metal-separated compartment separated by a metal partition. Switching device. Such as KYN28A-12 high voltage switchgear.
(2) Metal-enclosed bayonet switchgear (represented by the letter J) is similar to the armored metal-enclosed switchgear. The main electrical components are also housed in separate compartments, but with one or more levels of protection. Non-metallic separator. Such as JYN2-12 high voltage switchgear.
(3) Metal-enclosed box-type switchgear (represented by the letter X) The switchgear cabinet is a metal-enclosed switchgear. Such as XGN2-12 high voltage switchgear.
(4) Open switchgear, no protection level requirements, the housing is partially open switchgear. Such as GG-1A (F) type high voltage switchgear
How high voltage switchgear works
The general high-voltage power distribution cabinet is divided into: high-voltage incoming cabinet / PT metering cabinet / lightning protection cabinet / mother cabinet / transformer cabinet / outlet cabinet / capacitor compensation cabinet high-voltage inlet cabinet is the power from the power station, the first come in the cabinet Then, it is distributed to each electrical equipment or transformer through the inlet cabinet.
The high-voltage metering cabinet is the electric energy metering cabinet door for calculating the electricity consumption. The door is sealed with lead seal and sealed by the electric power bureau.
Mother cabinet: When the system has two power supply lines, and the two channels are mutually standby, the main busbars of the two power supplies need to be connected. The switchgear of the two busbars of Unicom is called the mother cabinet. Note: the mother cabinet and Two-way inlet cabinets are generally prohibited from closing at the same time
Capacitor compensation cabinet: compensates reactive power, improves power quality, reduces losses, and provides distribution operation data.
Transformer cabinet: A 20 or 50KVA transformer is installed inside, which is a transformer that supplies electricity to the substation.
Lifting cabinet: Because the high voltage cabinet is different from the low voltage cabinet, the electrical clearance of the high voltage cabinet is greater than that of the low voltage cabinet. In order to ensure the clearance, a lifting cabinet like this is added (some lifting cabinets are also equipped with isolation switches)
Outlet cabinet: The power supply is output from this cabinet. It generally has the functions of breaking, isolation and various protection functions (overcurrent, quick disconnection, overvoltage, undervoltage, zero sequence, differential, stalling, etc., which can be configured according to the needs of the protected equipment. )
PT cabinet: The voltage transformer cabinet is usually installed directly on the busbar to detect the bus voltage and realize the protection function. The main installation of voltage transformer PT, isolation knife, fuse and lightning arrester, etc., through the voltage transformer to provide operating system power supply of about 100v. Usually, this high-voltage power distribution cabinet is controlled by DC power supply, which is the second time of high-voltage power distribution cabinet. The control loop power level is -220V (DC 220V), and the DC screen is supplied with power.
When choosing to buy such a high-voltage switchgear, be sure to pay attention to the material of the cabinet. Because of the different materials, the overall price is not the same. In general, the switchgear is a complete set, so Say your size to the merchant at the time of purchase, or wait until it is shipped back and find it can't be put down, or other reasons, not only to delay things, but also to give yourself trouble. The above is the content of the role of the high-voltage switchgear, I hope to be helpful to everyone! If you want to know more about the exciting content, please continue to pay attention to our home appliance encyclopedia !
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