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High Voltage Isolation switchgear

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Service condition of GN72KV-2SGN72-2-1S type bipolar DC high-voltage isolation switch

1. The altitude does not exceed 2000 meters

2. Ambient temperature is not higher than ± 50 °C, not lower than -40 °C

3. Relative humidity of air ≤ 95% (30±2°C)

4. The installation environment should be free of conductive dust, gases that do not contain corrosive metals, and media that have explosion hazards, and there should be no severe vibration.

The bipolar DC high-voltage isolation switch GN72KV-2S is an important switchgear in power plants and substation electrical systems. It must be used in conjunction with high-voltage circuit breakers. Its main function is to ensure the safety of high-voltage electrical appliances and devices during overhaul work, and to isolate them. It can not be used to cut off, into the load current and breaking short-circuit current, and can only be used for some switching operation  which does not produce a strong arc.  It  meant that it does not have arc extinguishing function. It is divided into indoor style and outdoor style according to the installation site. And it is divided single column, double column and three-column  according to  the number of insulating pillars,  All voltage levels have optional equipment.

Bipolar DC high-voltage isolation switch GN72KV-2S box is equipped with bipolar DC isolation switch (hereinafter referred to as isolation switch), is a high-voltage isolation switch equipment directly operated by outdoor handwheel, installed in the high voltage silicon rectifier and ESP. In the case of no load, it is used to switch , transfer and ground the high voltage circuit of the ESP.

1. Technical parameters

Type

Rated working voltage(KV)

Rated wording current(A)

GN-72/3-2S-X

72

3

The structure and function of GN72KV-2S  bipolar DC high-voltage isolation switch

A. The shape box is composed of a box body, a top cover, an operating door, an inlet and outlet line, and a connecting ring. Each opening is provided with a rubber seal, and the back of the box body.

Open observation hole, easy to observe the situation of shape knife.

B. The top cover of the switch box and the operation door are equipped with safety interlocking devices to play a role in safety protection, which is conducive to safety and maintenance.

C. The GN72KV-2S bipolar DC high-voltage isolation switch  is composed of a second-level transmission mechanism with high-voltage insulating pillars and a group of grounding devices, etc. Each of the two groups of insulation pillars has a knife at the top to play a role of mutual connection and grounding. The isolation switch is installed in the cabinet. ,The drive shaft is connected with the hand wheel. The box body is made of high-grade amino baking varnish. It has the characteristics of outdoor wind and rain protection for safety.

D. Two LX12-2 low-voltage limit switches are installed on the switch base (additional indicators can be added according to the user's needs) to control the power supply. indication of electric field and grounding (attached: wiring diagram of the stroke switch)

The working principle and operation instruction of ESP High voltage isolation switch

(1). Principle of operation: Operate the hand wheel through the drive shaft, so that the high-voltage insulating pillar rotates of the positioning device can be clinged to the inside of the base, so that the top knife accurately into the contact seat, and connected to the desired working position.

(2). Operation Manual: According to the position of the nameplate indicated by the indicating pin, place the position on the other nameplate to 60°.

(3). The top cover of the shape box is equipped with a safety lock. If an inspection switch is encountered, the operation door should be opened firstly and the hand wheel should be turned to the grounding position before open the top cover safety lock, then make the check and repair.

The installation method of GN72KV-2S Bipolar DC high-voltage isolation switch 

A. Outline (as drawings)

B. There are two kinds of switch box A &B type, according to the introduction of high-voltage ESP to determine the required model fixed at the top of the ESP. GN72-2-1S is unipolar DC high voltage isolation switch.

C. The inlet end of the switch box is connected to the high voltage silicon rectifier, and the outlet end is connected to the large insulator room of ESP.

D. The wiring of switch insulator uses a round copper rod with a diameter of 10 mm (user-supplied), and a ground connection with a copper wire of 10 mm or more. The grounding resistance should not exceed 4 ohms.

The maintaince of GN72-2-1S unipolar DC high-voltage isolation switch

1. Since the high-voltage switch box is installed outdoors, it should be re-painted once every two years to prevent cabinet corrosion.

2. When the handwheel rotates abnormally, it should be checked in time to avoid damage to other components.

The switch shall be maintained periodically.The bearings at the bottom of the high-voltage insulator shall be washed and removed every two years and grease shall be applied to keep the handwheel rotating flexibly.

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