GN24-12(D) indoor high voltage isolating switch

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1. Overview
The series of indoor high-voltage isolating switches with grounding blades are indoor high-voltage switchgear with rated voltage and below, three-phase AC, and are used as voltage-free no-load switches in the power system. Used for breaking and closing circuits under certain circumstances. The series isolating switch has three working positions: closing, opening and grounding, and can operate step by step. It has the error-preventing performance of preventing the grounding wire from being hung when the power is charged and closing with grounding. It is suitable for - type metal armored fixed switch cabinets, and is also used as an improvement of - type and other switch equipment. It is an essential component to meet the three-proof requirements. The grounding contact knife can be used: when electrical equipment is out of power for maintenance, the grounding contact knife is closed according to the requirements of the "Safe Work Procedures" to create an artificial short circuit in the network to ensure that maintenance personnel receive reliable ground potential protection. As one of the main measures to protect against electric shock.
2. Environmental conditions
. The upper limit of ambient air temperature + ℃ and the lower limit - ℃ b. The altitude does not exceed.
The daily average relative humidity is not greater than, the monthly average is not greater than the water vapor pressure, the daily average is not greater than. The monthly average is not greater than.
. The surrounding air should not be significantly contaminated by corrosive or flammable gases, water vapor, etc.
. No frequent violent vibrations.
3. Structure and working principle
The type isolating switch relationship is based on the type isolating switch structure and adds the structure of the grounding switch to form an isolating switch. The main knife and the ground knife are programmed to interlock through the interlocking plate, reducing The number of manual operating mechanisms has been reduced, the five-proof function has been strengthened, and safety and reliability have been improved.
The contact blade is composed of two groove-shaped copper plates. It not only increases the heat dissipation area of the contact blade and is beneficial to lowering the bottom temperature, but also improves the mechanical strength of the contact blade and improves the dynamic stability of the switch. One end of the grounding knife is fixed on the grounding shaft and is short-circuited by the busbar. It is connected to the switch cabinet case through the grounding soft connection on the busbar and is connected to the ground. For the main knife and the ground knife of the isolation switch with currents above and above, magnetic fields are added. Lock plate is used to improve the dynamic and thermal stability of the isolating switch. 3 and below, there is no need to add a magnetic lock plate due to the small current limit of the isolating switch.