Working principle of high-voltage switchgear

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Generally, the high-voltage distribution cabinet is composed of high-voltage incoming cabinet/PT metering cabinet/lightning protection cabinet/bus coupler cabinet/transformer cabinet/outgoing cabinet/capacitance compensation cabinet. The high-voltage incoming cabinet is the power supply from the power station, which comes in first, and then is distributed to each electrical equipment or transformer through the incoming cabinet. The high-voltage metering cabinet is the electric energy metering cabinet for calculating the electricity consumption. The door of the cabinet shall be sealed with lead and the bus coupler cabinet shall be sealed by the electric power bureau. When the system has two incoming power lines and the two lines are standby for each other, the main bus lines of the two power lines need to be connected. The switch cabinet connecting two sections of buses is called the bus coupler cabinet. Note: the bus coupler cabinet and the two incoming line cabinets are generally prohibited from closing the capacitance compensation cabinet at the same time: compensating reactive power and improving the quality of electric energy, Reduce loss and provide distribution operation data at the same time.

Transformer cabinet: a 20 or 50KVA transformer is installed inside, which is used to supply power to the substation itself. Lifting cabinet: because the high-voltage cabinet is different from the low-voltage cabinet, the electrical clearance of the high-voltage cabinet should be greater than that of the low-voltage cabinet. In order to ensure the clearance, one such lifting cabinet (some lifting cabinets are also equipped with isolation switches) should be added to the outgoing cabinet: the power supply is output from this cabinet, which generally has the functions of breaking, isolating and various protection functions (over-current, quick breaking, over-voltage, undervoltage, zero sequence, differential, locked rotor, etc., which can be configured according to the needs of the protected equipment).

PT cabinet: voltage transformer cabinet is generally directly installed on the bus to detect bus voltage and realize protection function. Voltage transformer PT, disconnector, fuse and lightning arrester are mainly installed inside. The voltage transformer is used to provide about 100v working power for the operating system. Usually, the high-voltage power distribution cabinet is controlled by DC power supply, that is, the secondary control circuit power level of the high-voltage power distribution cabinet is - 220V (DC 220V), and the DC panel is used to supply its power.

When choosing to purchase this high-voltage switch cabinet, you must pay attention to the materials of the cabinet. Because the materials are different, the overall price is also different. In general, this switch cabinet is a complete set, so when you buy it, you should agree with the manufacturer about your size. Otherwise, when you ship it back, you will find it cannot be put down, or for other reasons, which will not only delay things, but also cause trouble for yourself. The above is about the role of high-voltage switchgear, and I hope it can help you!

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