What is the use of the porcelain bottle of the high voltage isolation switch

Rainproof. The outdoor type isolation switch should be installed horizontally when installed in the open air, so that the supporting porcelain bottle with a porcelain skirt can indeed play a rainproof role; When installed vertically, the static contact is on top, and the ground with a sleeve can be installed at an angle. Under normal circumstances, the static contact is connected to the power supply, and the moving contact is connected to the load, but when the isolation switch installed in the power receiving cabinet adopts the cable inlet, the power supply is on the moving contact side, and this connection method is commonly known as "pouring into the fire".

The two sides of the isolation switch should be firmly connected with the bus bar and cable, and when the copper and aluminum conductors are in contact, copper-aluminum transition joints should be used to prevent galvanic corrosion. Please check the encyclopedia for more information.

The porcelain bottle of the high-voltage disconnector obviously plays the role of insulation and support.

The purpose of the high-voltage isolation switch is: to ensure the safety of high-voltage electrical appliances and devices during maintenance work, to play the role of isolation voltage, can not be used to cut off, put load current and break short-circuit current, can only be used for some switching operations that do not produce a strong arc, that is, it does not have the function of arc extinguishing.

The high-voltage disconnector is an important switching appliance in the electrical system of power plants and substations, and needs to be used in conjunction with high-voltage circuit breakers.

According to the different installation sites, it is divided into indoor and outdoor types, and is divided into single-column type, double-column type and three-column type according to the number of insulating pillars, and there are optional equipment for each voltage level.

Recommended brand of disconnector; Minrong Electric.

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The high-voltage disconnector is mainly an opening circuit, forming an obvious disconnection point.

The high-voltage isolation switch ensures the safety of high-voltage electrical appliances and devices during maintenance work, plays the role of isolating voltage, and cannot be used to cut off, put load current and break short-circuit current, and can only be used for some switching operations that do not produce strong arc, that is, it does not have the function of arc extinguishing; According to the different installation sites, it is divided into indoor and outdoor types, and is divided into single-column type, double-column type and three-column type according to the number of insulating pillars, and there are optional equipment for each voltage level.

It is also possible to reliably isolate the part of the high-voltage power distribution unit that needs to be shut down from the live part to ensure the safety of maintenance work. The contacts of the high-voltage disconnector are all exposed to the air and have an obvious disconnection point, and the disconnector does not have an arc extinguishing device, so it cannot be used to cut off the load current or short-circuit current;

Otherwise, under the high-pressure bending and burial, the disconnection point will produce a strong arc, and it is difficult to extinguish itself, and may even cause arcing (relative or phase short circuit), burn the equipment, endanger personal safety, this is the so-called "load pull isolation switch" serious accident.

High voltage disconnector model.

The type of high-voltage isolation switch can be divided into indoor and outdoor according to the erection location, and can be divided into two kinds of grounding gate knife and non-grounding gate knife according to the grounding gate knife, and the model is composed of two parts: letters and numbers, as shown in the figure

High-voltage disconnector model representation method.

For example, a model is: GW5-110GD 600. It represents an improved outdoor high-voltage disconnector with a rated voltage of 110kV and a rated current of 600A with a grounding switch.

The role of the high-voltage disconnector.

Isolation voltage: Isolate the electrical equipment from the live power grid to ensure that the isolated electrical equipment has obvious disconnection points and can be safely repaired.

Switching busbars: In circuits with double busbars, disconnectors are used to switch equipment or lines from one set of buses to another.

Switching on and off circuits: small current circuits can be turned on and off according to regulations, such as: switching on and off voltage transformer and arrester circuits;

The on-and-off voltage is 10kV, the length of the 10km no-load overhead line or the voltage of 10kV, the length of the 5km no-load cable line.

No-load transformers with a turn-on and disconnection voltage of 10kV or less, a capacity of 315kVA or less, and an excitation current of 2A or less.

The main purpose of the high-voltage 10kv disconnector is to prevent the operator from being electrocuted, because the voltage is too high compared to 10kv, and it is easy to be electrocuted if you are not careful.

The high-voltage disconnector is to be safer during maintenance, and it is isolated without electricity, and then it is grounded, for fear of unnecessary danger caused by mispower transmission.

The high-voltage isolation switch has obvious segmented clearance, so it is mainly used to isolate the high-voltage power supply, ensure safe maintenance, and can turn on and off a certain small current. It does not have a special arc extinguishing device, so it is not allowed to cut off the normal composite power supply, let alone use it to cut off the short-circuit current. Disconnectors are often used in conjunction with circuit breakers because they have significant segment clearances.

According to the place of use of the disconnector, the high-voltage disconnector can be divided into two categories: indoor and outdoor.

When operating the isolation switch, you should pay attention to the operation sequence, pull the line side isolation switch first when the power is off, close the bus isolation switch first when sending power, and before operating the isolation switch, pay attention to check the circuit breaker but the actual open circuit position before operating the isolation switch.

1 Operation when the disconnector is closed:

1) Whether it is operated by manual transmission device or with an insulated operating rod, it must be quick and decisive, but the force should not be too strong at the end of closing, so as not to damage the equipment, deform the mechanism, rupture the bottle, etc.

2) After the operation of the disconnector is completed, check whether it is closed. After reconciliation, the disconnecting switch should be completely entered into the fixed contact, and the tightness of the contact should be checked.

2 Operation when the disconnector is pulled:

1) It should start slowly and cautiously, and quickly when the blade outline leaves the fixed contacts. In particular, when cutting off the no-load current of the transformer, the charging current of overhead lines and cables, the small load current of overhead lines and the loop current, and the isolation switch should be pulled quickly and decisively, so as to quickly eliminate the arc.

2) After pulling the disconnector, check that each phase of the disconnector is indeed in the disconnected position and the blade should be pulled to the end as much as possible.

3 When the disconnector is pulled and closed by mistake during operation:

1) When the disconnector is mistaken during operation, it is not allowed to pull the disconnector apart when it is suitable for mistakes, even if arcing occurs in closing. Because of the load isolation switch, it will cause a three-phase arc short circuit accident.

2) When the isolation switch is pulled by mistake, the arc will occur when the blade outline leaves the fixed contact, and at this time, it should be closed immediately to eliminate the arc and avoid accidents. If the disconnector has been fully opened, it is never allowed to close the disconnector that was pulled by mistake.

If it is a single-pole disconnector, if it is found that it is pulled by mistake after operating one phase, it is not allowed to continue to operate the other two items.

The high-voltage isolation switch has obvious segmentation clearance, so the high-voltage isolation is mainly used to isolate the high-voltage power supply, ensure safe maintenance, and can turn on and off a certain small current. There is no special arc extinguishing device, so it is not allowed to cut off the normal composite power supply, let alone cut off the short-circuit current.

High Voltage Disconnector**.

The function of the high-voltage isolation switch porcelain bottle: the high-voltage power distribution device needs to be effectively isolated from the live part to ensure the safety of maintenance personnel in the maintenance work.

The disconnector (also known as the knife switch at the operation site) is the simplest form of high-voltage switch. Because it does not have a specially set arc extinguishing device, it cannot be used to turn on or off load current and short-circuit current. Its main uses are:

1) Isolate the power supply with an isolation switch to reliably isolate the electrical equipment that needs to be overhauled from the live power grid, so that the overhauled electrical equipment and the power supply have obvious disconnection points to ensure the safety of the maintenance work.

2) Reverse operation In the circuit of double bus operation, the disconnector is used to switch the power supply equipment or line from one group of buses to another set of buses.

3) It is used to turn on or off a small load current.