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What Is An Isolation Switch? What Does IT Do Differences With Circuit Breakers

What Is An Isolation Switch? What Does IT Do Differences With Circuit Breakers

August 31 , 2023 0

It is a switching device mainly used for "isolating the power supply, reversing operation, connecting and cutting off small current circuits", without arc extinguishing function. When the disconnecting switch is in the sub-position, there are insulation distances between the contacts in accordance with the specified requirements and obvious disconnection marks; when it is in the closed position, it is a switching device that can carry current under normal circuit conditions and current under abnormal conditions (e.g., short-circuits) for a specified period of time. Generally used as a high-voltage disconnecting switch, i.e. a disconnecting switch with a rated voltage of 1kV or more, it is relatively simple in its own principle of operation and structure, but due to the high volume of use and high requirements for operational reliability, it has a greater impact on the design, establishment and safe operation of substations and power plants. The main feature of the disconnecting switch is that it has no arc extinguishing capability and can only divide and close the circuit in the absence of load current.

What Is A Isolation Switch?

Disconnect switches, also known as disconnectors, are a commonly used high-voltage switches, because the disconnectors do not have arc extinguishing devices, so the disconnectors can only be used to open and close circuits before opening or in the process of disconnecting the switch closure in the circuit there is no current or close to the absence of current, and there is generally no requirement for the speed of the dynamic contacts to open and close.

Disconnect switches have a clearly visible breaking point of the open point, static, dynamic contacts are generally directly exposed to the air, do not need to configure complex arc extinguishing device, can be used to pass the voltage and no load circuit, and fully for the connection and disconnection of unloaded short circuits, voltage transformers and a limited capacity of the unloaded transformer switch is called disconnecting switches. Isolated switch is a high-voltage switch in the use of electrical appliances, its own operating principle and structure is relatively simple, but due to the use of a large amount of high operational reliability requirements for substations, power plants, design, set up and safe operation of the impact of the larger. The main feature of the knife gate is no arc extinguishing capacity, only in the absence of load current, close the circuit.

The Role Of Isolation Switch

1. The disconnecting switch mainly plays the role of isolation, that is, it can isolate the power equipment that needs to be repaired from the electrically charged power grid, so as to ensure the safety of the repair personnel.

2. The disconnecting switch plays the role of switching, mainly switching lines or busbars.

3. Disconnectors play the role of closing and opening, disconnectors do not have arc extinguishing devices, so disconnectors can only be used to close and open power equipment or voltage transformers and other equipment.

There are many types of disconnectors, which can be divided into outdoor disconnectors and indoor disconnectors according to the installation location.
In addition to the disconnecting switch, there is also a load switch, load switch refers to the switch can open and close the rated load current, load switch is a switch with a simple arc extinguishing device.
The main role of the load switch is to open and close the application, because the load switch has the ability not to extinguish the arc, so it can be used to open and close the load current and less than a certain number of times the overload current, but also can be used to open and close than the disconnecting switch allows the capacity of the unloaded transformer, longer unloaded line, and sometimes can be used to open and close the large-capacity capacitor bank.
Load switches also have an alternative role. Load switch and current-limiting fuse series combination can be used instead of circuit breakers, by the load switch to undertake opening and closing less than a certain number of times the overload current, and by the current-limiting fuse to undertake to open a relatively large overload current and short-circuit current.

What Is The Role Of The Isolation Switch

1, the role of the disconnecting switch is to disconnect the circuit without load current. So that the maintenance of equipment and power supply has a significant point of disconnection to ensure the safety of maintenance personnel, the barrier switch without special arc extinguishing equipment can not cut off the load current and short-circuit current, so must be in the circuit in the circuit breaker to disconnect the circuit before being able to operate the disconnect switch.

2, in the maintenance of electrical equipment, supply an electrical distance, and is a significant visible disconnection point to ensure the protection of personnel personal safety.

3, the disconnecting switch can not be operated with load: can not operate with additional load or large load, can not divide and close load current and short circuit current, but there is an arc extinguishing chamber can be operated with small load and unloaded line.

4, the usual power supply operation: first close the blocking switch, then close the circuit breaker or load switch; power failure operation: first disconnect the circuit breaker or load switch, then disconnect the blocking switch.

5, the selection and other electrical equipment, the same as its extra voltage, extra current, dynamic stability current, thermal stability current and so on must meet the needs of the occasion.

6、What is the main role of the disconnecting switch? "The role of the disconnecting switch is to isolate the power supply, invert the gate operation, used to connect and cut off the small current circuit, the disconnecting switch does not have a special arc extinguishing device can not cut off the load current and short-circuit current, need to be in the case of the circuit breaker breaks the circuit, before the operation of the disconnecting switch."

7, high-voltage isolation switch to ensure the safety of high-voltage electrical appliances and devices in the maintenance work, the role of isolation voltage, can not be used to cut off, put into the load current and open short-circuit current, can only be used for some switching operations do not produce a strong arc, that is to say, it does not have the function of extinguishing the arc; according to the different locations of the installation is divided into the house type and the type of the outside of the house, according to the number of insulated columns are divided into, single-column, double-column and triple-column, the voltage level are optional equipment. Voltage level are optional equipment.

8. It can also reliably isolate the part of the high-voltage distribution unit that needs to be de-energized from the energized part to ensure the safety of the maintenance work. The contacts of the high-voltage disconnecting switch are all exposed in the air and have obvious disconnection points. The disconnecting switch has no arc extinguishing device and therefore cannot be used to cut off load or short-circuit currents.

9. Under the action of high pressure, a strong electric arc will be generated at the disconnection point, which is difficult to be extinguished by itself, and may even cause a flying arc (relative to the ground or phase-to-phase short-circuiting), which will damage the equipment and jeopardize the personal safety, and this is the so-called "pulling the disconnecting switch with load" serious accident.

Isolation Switch And Load Switch Difference

1、Difference in cutting off current
Disconnectors and load switches cut off the current difference is not the same, the disconnectors are only suitable for cutting off the no-load current, can not cut off the load current, short-circuit current, so the disconnectors can only be safely operated in the circuit safety disconnections and rigorously operated with the load, so as not to cause safety accidents.
The load switch because of the arc extinguishing device, so can overload current and rated load current, but the same can not cut off the short-circuit current.

2. Arc extinguishing device difference
Load switch has an arc extinguishing device, while the disconnecting switch does not have such a device, the so-called arc extinguishing device is in order to be able to better help to the switching appliance disconnection and closure, but also to effectively limit the arc, help arc extinguishing.
There is such a kind of arc extinguishing device, the switching appliance is safer, so most of the switching appliance inside is by the arc extinguishing device. Especially for home use switching appliances.

3, the role of the difference
Isolation switch and load switch role is different, isolation switch because there is no arc extinguishing device, so it can only be applied to high-voltage circuit devices need to be charged part and need to blackout part of an isolated role, in order to ensure that the personnel of the high-voltage circuit maintenance and inspection, to ensure the safety of personnel.
The load switch is used in fixed high-voltage equipment, can cut off the fault current in high-voltage equipment as well as the rated current, so the role of the two are different, but both are used in high-voltage equipment.

Differences Between Isolation Switches And Circuit Breakers

1、Isolation switch

Also known as "knife gate", its main role is to isolate the power supply, reverse gate control, used to connect and cut off the small current circuit. Its working principle and structure is relatively simple, and its use is also large, high reliability requirements.

Isolated switch, there is no arc elimination equipment, can not be used to cut off or put into a certain capacity of the load current and fault current, only in the case of small load off. Moreover, the disconnecting switch is mainly operated manually on the spot, and from the appearance, it can be seen at a glance its operation status, and there is an obvious disconnection point when it is overhauled.

2、Circuit breaker
Circuit breaker is also known as "switch", its scope of use is in the high-voltage circuit breaker and low-voltage circuit breaker, able to close, carry and break the current of the normal circuit. Generally, the current above three kilowatts is called as a high-voltage appliances. Circuit breakers can be used to distribute electrical energy and to protect the power supply as well as the motor.

Circuit breaker, equipped with arc extinguishing equipment, can cut off the load current and fault current, fault, it can also be automatically tripped. And also, there are some models of circuit breakers also have the function of isolation, can also be used as isolation appliances. Generally used for remote electric control operation.