CN204068222U - A kind of switch cabinet arc light protector - Google Patents

Abstract

An arc protection device for a switchgear, belonging to the field of electrical equipment, each circuit breaker of the switchgear is provided with an arc extinguishing cover, and the inside of the arc extinguishing cover is hollow, and a cooling gas pipeline is arranged in the hollow arc extinguishing cover, and the arc extinguishing The cover includes a plurality of grids, each grid is provided with a cooling gas outlet hole, and the cooling gas pipeline is connected to the liquid nitrogen supply pipeline outside the switch cabinet. The liquid nitrogen supply pipeline is equipped with an automatic valve, and the automatic valve is connected to a The controller, by using the arc extinguishing cover of this structure, can reduce the precious temperature of the switch and reduce the emission of thermal electrons, thereby reducing or stopping the generation of arc phenomenon, thereby preventing greater harm.

Description

A switchgear arc protection device

technical field

The utility model relates to an arc light protection device, in particular to an arc light protection device for a switch cabinet, which belongs to the field of electrical equipment.

Background technique

In electrical appliances with contacts, the process of making and breaking current by the contacts is often accompanied by gas discharge, and arc is a form of gas discharge. Gas discharge is divided into self-sustained discharge and non-self-sustained discharge. Arc belongs to arc discharge in gas self-sustained discharge. In the gap), a cloud of extremely high temperature, extremely bright and conductive gas is produced, which is called an arc. Due to the high temperature of the arc, under the action of high temperature, the neutral points at high temperature will produce strong irregular thermal motion due to the high temperature. When the neutral points collide with each other, they will be dissociated to form electrons and ions. A kind of dissociation caused by thermal movement is called thermal dissociation. Thermal dissociation produces a large number of electrons and ions to maintain the arc between the contacts. The arc is mainly generated when the contact disconnects the circuit. The high temperature will burn the contact and insulation. In severe cases, it may even cause a phase-to-phase short circuit, electrical explosion, and cause a fire, endangering the safety of personnel and equipment. Therefore, the purpose of studying the arc from the perspective of electrical appliances is to understand its basic laws and find out corresponding methods to make the arc extinguish as soon as possible in the electrical appliance.

At present, some gases such as nitrogen will be produced in the production process. Since there are no users who use nitrogen in large quantities, these gases have to be discharged into the atmosphere. How to reduce the discharge of nitrogen and other gases is also a measure for environmental protection.

Contents of the invention

Aiming at the problems that the temperature in the electrical cabinet rises and the high temperature will burn the contacts and insulation when an arc occurs, and even cause phase-to-phase short circuit, electrical explosion, and fire in severe cases, endangering the safety of personnel and equipment, etc., in order to reduce the environmental load, this utility model The invention provides an arc light protection device for a switchgear, the purpose of which is to reduce the temperature in time and prevent the arc light from causing heavy losses.

The technical scheme of the utility model is: an arc protection device for a switchgear, including a circuit breaker, each circuit breaker of the switchgear is provided with an arc extinguishing cover, the inside of the arc extinguishing cover is hollow, and the hollow arc extinguishing cover is provided with The cooling gas pipeline, the arc extinguishing cover includes a plurality of grid pieces, each grid piece is provided with a cooling gas outlet hole, the cooling gas pipeline is connected to the liquid nitrogen supply pipeline outside the switch cabinet, and the liquid nitrogen supply pipeline is provided with Automatic valve, the automatic valve is connected with a controller, the switch cabinet is provided with an arc sensor, the arc sensor is connected to the controller, the controller receives the signal of the arc sensor and controls the opening and closing of the automatic valve, the liquid nitrogen supply pipeline is A manual valve is provided, and the manual valve is connected to the cooling gas pipeline and the liquid nitrogen supply pipeline through a bypass. The gas outlet hole is located in the lower half of the side of the grid, the gas outlet hole is inclined upward, and the angle between the gas outlet hole and the horizontal direction is Between 15-45 degrees.

The positive effect brought by the utility model is that by setting the arc extinguishing cover into a hollow state, the nitrogen gas used for cooling and extinguishing can be sent to the vicinity of the circuit breaker, and by setting an automatic valve on the nitrogen gas pipeline, when the arc light detection sensor detects In the event of an arc, the controller will send an instruction to the automatic valve to open the nitrogen pipeline in time, and send the nitrogen to the vicinity of the circuit breaker in time, and use the cooling effect of nitrogen to reduce the temperature of the circuit breaker and even the switch cabinet to prevent the arc from continuing to spread and cause Big disaster, by setting upward air outlets on the arc extinguisher, nitrogen can be directly blown to the side of the circuit breaker, reducing the temperature of the circuit breaker as quickly as possible. By connecting a pipeline in parallel next to the automatic pipeline, according to the situation in the switch cabinet, the nitrogen manual valve can be properly opened in normal times to provide a small amount of nitrogen to the electrical cabinet, which can prevent the occurrence of arc light, and at the same time, it will also play a role in the electrical components. to anti-oxidation.

Description of drawings

Fig. 1 is the schematic diagram of the utility model.

Detailed ways

The technical solution of the utility model will be further described below with reference to Fig. 1, in the figure: 1: static contact of circuit breaker, 2: static contact of circuit breaker, 3: arc light sensor, 4: grid of arc extinguishing cover, 4a: outlet Air hole, 5: bypass pipeline, 5a manual valve, 6: automatic pipeline, 6a: automatic valve, 7: controller, 8: sensor circuit, 9: nitrogen tank, 10: switch cabinet.

The utility model relates to an arc protection device for a switchgear, which includes a circuit breaker. Each circuit breaker in the switchgear 10 is provided with an arc extinguishing cover. The inside of the arc extinguishing cover is hollow, and a cooling gas is arranged in the hollow arc extinguishing cover Pipelines, including bypass pipelines 5 and automatic pipelines 6 in this embodiment, the arc extinguishing cover includes a plurality of grids, each grid is provided with a cooling gas outlet, 4a, and the cooling gas pipeline is connected to the liquid outside the switch cabinet 10 Nitrogen supply pipeline, the liquid nitrogen supply pipeline is provided with an automatic valve 6a, the automatic valve 6a is connected to the controller 7, the arc sensor 3 is arranged in the switch cabinet 10, and the arc sensor 3 is connected to the controller 7, The controller 7 receives the signal from the arc sensor 3 and controls the opening and closing of the automatic valve 6a. The liquid nitrogen supply pipeline is provided with a manual valve 5a, and the manual valve is connected to the cooling gas pipeline and the liquid nitrogen supply pipeline through the bypass pipeline 4. , the air outlet hole 4a is located in the lower half of the side of the grid sheet, the air outlet hole is inclined upward, and the angle between the air outlet hole and the horizontal direction is between 15-45 degrees.

In the switchgear 10, in addition to the above-mentioned electrical components, there are other electrical components, which will not be described in detail here. In the switchgear, when the circuit is disconnected, a strong hot spot will appear on the cathode, and there will be electrons. Diverge around the electric level, the divergence of thermal electrons is related to the surrounding temperature, and the divergent electrons collide with the surrounding neutral protons. When the electrons accumulate to a certain extent, the neutral protons will be dissociated, forming a new Electrons and positive ions, under the action of the applied voltage, carry some particles to do directional movement to form a current, and the current breaks down the medium to form an arc. In this case, by introducing a small amount of nitrogen, the ambient temperature around the circuit breaker can be reduced. The electrodes of the circuit breaker generate thermal electrons, thereby reducing the possibility of arc generation. Once an arc occurs, the arc sensor 3 installed next to the circuit breaker will detect the arc and transmit the information to the controller at a very fast speed. An instruction will be issued. Under the instruction of the controller 7, the automatic valve 6a will send nitrogen gas into the circuit breaker through the automatic pipeline 6. Since the nitrogen gas has a cooling and flame-retardant effect, it will reduce the temperature in the circuit breaker, thereby reducing the temperature of the circuit breaker. The probability of generating thermal electrons will also reduce the probability of arcing. Since the blowing of nitrogen gas will extend the length of the arc, elongating the arc means reducing the density of thermal protons in the medium, suppressing the ionization of collisions, and reducing temperature, the purpose of arc extinguishing will be achieved.

By setting the inside of the arc extinguisher in a hollow state, the nitrogen gas used for cooling and extinguishing can be sent to the vicinity of the circuit breaker. By setting an automatic valve on the nitrogen gas pipeline, when the arc light detection sensor detects the arc light, the controller will promptly send to the automatic The valve sends out an instruction to open the nitrogen pipeline, and the nitrogen is sent to the vicinity of the circuit breaker in time, and the cooling effect of nitrogen is used to reduce the temperature of the circuit breaker and even the switch cabinet, so as to prevent the arc from continuing to spread and cause a catastrophe. The upward air outlet can directly blow nitrogen to the side of the circuit breaker to reduce the temperature of the circuit breaker as soon as possible. By connecting a pipeline in parallel next to the automatic pipeline, according to the situation in the switch cabinet, the nitrogen manual valve can be properly opened in normal times to provide a small amount of nitrogen to the electrical cabinet, which can prevent the occurrence of arc light, and at the same time, it will also play a role in the electrical components. to anti-oxidation.

Claims (4)

1. a switch cubicle arc light protector, comprise circuit breaker, it is characterized in that: each circuit breaker of switch cubicle is provided with arc-extinguish chamber, be hollow form in described arc-extinguish chamber, be provided with refrigerating gas pipeline in the arc-extinguish chamber of hollow, arc-extinguish chamber comprises multiple grid, each grid is provided with refrigerating gas venthole, liquid nitrogen supply line outside refrigerating gas pipeline UNICOM to switch cubicle, described liquid nitrogen supply line is provided with automatic valve, and automatic valve is connected with controller.

2. a kind of switch cubicle arc light protector according to claim 1, is characterized in that: be provided with arc photosensor in described switch cubicle, arc photosensor is connected to controller, and controller receives the signal of arc photosensor and controls automatic valve opening and closing.

3. a kind of switch cubicle arc light protector according to claim 1, is characterized in that: described liquid nitrogen supply line is provided with manually-operated gate, and manually-operated gate connects refrigerating gas pipeline and liquid nitrogen supply line by bypass.

4. a kind of switch cubicle arc light protector according to claim 1, is characterized in that: described venthole is positioned at for grid side Lower Half, and venthole tilts upward, and the angle of venthole and horizontal direction is between 15-45 degree.