Disconnectors , also known as Isolators, are used in HV and MV installations to isolate a circuit or parts of a circuit and to ensure, for safety reasons, to the operators and maintenance teams a visible interruption of the circuit.
High voltage isolating switch is widely used in power stations and substations. Because it has no arc extinguishing device, so it can not be used to cut off the load current, but can not cut off the short circuit current, usually used with high voltage circuit breaker.
indoor HV disconnect switch applies to power system of rated voltage below 12KV, AC 50/60Hz
isolating switch, It is used to make the break and transfer current for HV electric apparatus under situations with voltage and no-load.
outdoor high voltage disconnector used for open of closing circuits under voltage but no-load condition in 12KV outdoor electrical system
outdoor high voltage disconnector used for open of closing circuits under voltage but no-load condition in 40KV outdoor electrical system
Indoor AC High Voltage Disconnect Switch Isolating Switch, used for 10 ~ 110 KV voltage of power system
This isolation switch is designed to meet the needs of the fixed type high-voltage cabinet, small-sized development
12KV disconnect switch is mainly composed of a contact, a contact knife, insulator and an underframe.
It is suitable for three-phase AC 50Hz, 10kV/15kV/20kV rated voltage outdoor high-voltage electrical equipment.
How to choose a medium voltage Disconnector switch?
The conditions for selecting a voltage isolating switch can be divided into technical conditions and environmental conditions.
(1) Technical conditions.
1) Choose according to normal technical conditions: this includes voltage, current, frequency and mechanical load.
2) According to short-circuit stability verification, this includes dynamic stability, thermal stability and duration verification.
3) According to the ability to withstand overvoltage: this includes the insulation level between the ground and the fracture, the creepage distance of the external insulation, etc.
(2) Environmental conditions.
This includes ambient temperature, daily temperature difference (outdoor use), maximum wind speed (outdoor use), relative humidity (outdoor, interior use), pollution conditions (outdoor use), altitude, seismic intensity, etc.
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