Disconnector Switch
Disconnector Switch that is in the OFF position, there is compliance with the requirements of the contacts between the insulation and the apparent disconnect from the flag; In the engaged position, the circuit can carry current under normal conditions and in the regulations under current switching equipment within the time abnormal conditions we are talking about isolating switch, generally refers to high-voltage isolation switch, which rated voltage 1kv and above the isolation switch, usually referred to as the isolation switch, high voltage switch is one of the most used appliances appliances, its own working principle and structure is relatively simple, but the use of large, high reliability requirements, the impact of substations, power plant design, build and safe operation are larger. The main features without breaking the ability knife is only in the case of no load current, co- circuits.
2 major role
1 ) After the opening, the establishment of reliable insulation gap will need to repair the equipment or lines with an obvious disconnect the power supply are separated points in order to ensure the safety of maintenance personnel and equipment.
2 ) Depending on the operating needs for access lines.
3 ) can be used to open, close lines of small currents, such as casing, bus connector, short cable charging current, the capacitance switch equalizing current, double bus for access when the circulation of the excitation current and the voltage transformer and so on.
4 ) According to the specific circumstances of different structural types can be used to open, close certain load capacity of the transformer magnetizing current. High-voltage isolation switch their different installation methods can be divided into outdoor and indoor high-voltage isolation switch high-voltage isolation switch. Outdoor high-voltage isolation switch means can withstand wind, rain, snow, filthy, condensation, ice and heavy frost and so on, suitable for high-voltage isolation switch is installed on the terrace use. Their isolation can be divided into single-pole switch (single-column disconnector), double-column isolation switch (double-column disconnector), three-column isolation switch (three-column disconnector) insulated pillar structure. One single pole busbar disconnectors in the overhead space directly below the vertical fracture of the electrical insulation used, therefore, has the obvious advantage that saves floor space, reducing the connection of wires, while points closing state particularly clear. In the case of the EHV transmission, substation using a single column knife, saving an area of effect is more significant.
3 Features
1 when the electrical equipment maintenance, providing an electrical interval, and is a visible break point to protect the personal safety of maintenance personnel.
(2) with a load isolation switch can not operate: Not rated load with a large load operation or not, close the load current and short-circuit current, but there interrupter can take a small load and no-load line operation.
(3) When the general power transmission operations: First combined isolation switch, circuit breaker or load class after closing switch; When power operation: First class circuit breaker or disconnecting switch, disconnect the isolation switch.
4. The selection and other electrical equipment is no different, had a rated voltage, rated current, dynamic current, thermal current, etc. Have to meet the needs of occasions. The role of isolation switch is off no-load current, the circuit. Makes the maintenance of equipment and power has obvious break point to ensure the safety of maintenance personnel, Disconnector Switch is not dedicated interrupter device load current and short circuit can not be cut off current, it is necessary to isolate the switch can operate in the case of the circuit breaker opens the circuit,
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