Vacuum dead-tank circuit breaker. RU patent 2498439.

FIELD: electricity.

SUBSTANCE: vacuum dead-tank circuit-breaker contains at least one gas-filled tank with a hollow insulator inside thus forming a sealed chamber and vacuum arc-quenching chamber (VAQC) consisting of insulator with two flanges, at that one flange is connected hermetically to the first flange of the hollow insulator. Inside VAQC insulator there are moving and fixed contacts and bellows connected hermetically to the flange of VAQC insulator; insulation traction is connected to the moving contact; it passes through VAQC bellows and moving unit of the hollow insulator. At that the second flange of the hollow insulator is connected hermetically to gas-filled tank of the circuit-breaker.

EFFECT: increasing reliability of the circuit-breaker, its environmental safety, expanding application scope to areas with severe climatic conditions.

5 cl, 2 dwg

The invention relates to the electrical engineering, namely to the switching equipment of high voltage.

Sulfur hexafluoride has excellent insulating and properties thanks to which were created compact switchgear, significantly reduced the dimensions of substations.

Known tank circuit breakers, including breakers, switchgear and gas-insulated switchgear)containing a sealed enclosure with sulfur hexafluoride arcing device, which is fixed on a support of isolation within this enclosure, power inputs in housing and drive with gear mechanism to device.

However, the electrogas have their disadvantages. When the work of the switch formed toxic products, and requires special technology at their disposal. The growing use of gas-insulated equipment leads to increasing the production growth of compartments, which ultimately ends up in the atmosphere, which is fraught with environmental problems. Besides its use in areas with severe climate is difficult due to condensation of gas at low temperatures.

Known switch gas insulated, where as the switching element is a vacuum arc chamber (VDK) (patent WO №2011052010, class H02B 13/02 publ. 05.05.2011,), which is in a gaseous environment.

Vacuum arc chamber consists of insulating housing (glass, ceramics), inside of which there are movable and stationary contacts, bellows to ensure the movement of the moving contact and insulating rod.

Due to the lack of mechanical strength of the insulating housing VDK and bellows gas pressure in this switch must be very low and close to atmospheric pressure. It is also necessary to reduce the effort in ensuring the required speed of movement of the moving contact HDS, and use of a drive with less energy.

Low gas pressure leads to a loss of electrical durability of gas isolation, which leads to a significant increase in overall dimensions of the tank circuit breaker.

Closest to the proposed decision is vacuum breaker (further - switch), which also uses vacuum Luggage (US Patent # 4458119, class H01H 33/04 publ. 03.07.1984,), containing at least one gas-filled tank, placed inside it hollow insulator, forming a sealed chamber, vacuum camera (VDK), consisting of insulator with two flanges, one of flanges hermetically sealed with the first flange hollow insulator, located inside insulator VDK movable and fixed contacts and bellows, tightly connected to the flange of the isolator VDK, insulating rod, tied with a movable contact and passing through the bellows VDK and node rolling sealing the hollow insulator.

Tank circuit breaker is filled with gas at a pressure of 0.5 MPa. To protect the device from exposure to pressure electrogas, she placed in that sealed camera. The disadvantage of this solution is the lack of reliability of the switch. Body VDK and the hermetic chamber is structurally fully self contained and are not associated with the tank circuit breaker. Over time will take place gas leakage through the floating seal in a sealed chamber, which will raise the pressure inside her and threatens the functioning of the HDS (mechanical load on the bellows and body VDK, decrease of speed of movement of the moving contact). Because a sealed chamber is not connected with a tank circuit breaker, protection against pressure increase inside it is possible only at considerable complication of construction, leading to a reduction in the reliability of operation of the switch.

It is known that the use of sulfur hexafluoride switches are necessary for the short circuit pressure limits the use of the latest in areas of low temperatures of ambient air. For these purposes the use of a mixture of compartments with other gases. However, the total pressure of the mixture is usually significantly above that which takes place in the purely gas-insulated circuit breakers. In this case, the application of the decision further reduces the reliability of the switch.

Effect : enhanced reliability of tank vacuum circuit breaker, ecological safety and environmental safety, as well as the expansion of spheres of application switches to areas with severe climatic conditions.

This technical result is achieved by the vacuum switch, containing at least one gas-filled tank, placed inside it hollow insulator, forming a sealed chamber, vacuum camera (VDK), consisting of insulator with two flanges, with one flange hermetically sealed with the first flange hollow insulator, located inside insulator VDK movable and fixed contacts and bellows, tightly connected to the flange of the isolator VDK, insulating rod, tied with a movable contact, and passing through the bellows VDK and node rolling sealing the hollow insulator, what is new is that the second flange hollow insulator also hermetically sealed with gas filled tank circuit breaker.

Vacuum arc chamber is located inside the hollow insulator, his first flange hermetically sealed with flange insulator VDK its fixed contact.

Vacuum arc chamber is located on the outside of the hollow insulator, his first flange hermetically sealed with flange insulator VDK by sliding contact.

Hollow insulator consists of several parts

Hermetic chamber is equipped with a safety device.

Application of the above hollow insulator connected with the tank circuit breaker second flange forms a sealed chamber, isolated from the rest of the volume of gas-filled tank (hereinafter - tank), inside which can be VDK. In this case, inside the gas pressure is maintained constantly low, that ensures the normal functioning of VDK. For the same purpose sealed chamber can be filled with insulating liquid. The rest volume of the tank to reduce its size can be used gas insulation under high pressure. Preventing the increase of pressure of the gas inside the hermetic chamber is provided with a safety device. Since the second flange of the hermetic chamber is connected with a tank safety device has access through the wall of the tank into the environment.

Option with the location of the KDV outside of the hollow insulator also possible if the material housing VDK is able to withstand high pressure gas. In this case, sealed chamber with the lower pressure ensures reliable functioning of the bellows seals rolling and drive VDK.

Insulator sealed chamber, may be made of several parts. In this case, the simplified execution contact with flange VDK associated with a rolling pin.

Figure 1 presents an example of the execution of tank vacuum switch with VDK, located inside the hollow insulator.

Figure 2 shows an example of the execution of tank vacuum switch with VDK, located outside of the hollow insulator.

Б vacuum switch contains a gas-filled metal tank 1. If switch consists of several arc breaks, it may consist of several tanks. Inside the tank posted: hollow insulator 2 (figure 2), which may consist of several parts 2A and 2B (figure 1), with two flanges 3, 4; vacuum arc chamber 5; insulating thrust 6, associated with the circuit breaker drive. In the tank circuit breaker are insulators for high-voltage bushings 7. Hollow insulator (figure 1) generates a sealed chamber, inside of which have VDK, consisting of insulator 8 with two flanges 8A, 8b, rolling 9 and stationary 10 contacts, bellows 11. Bellows sealed to the flange 86 insulator VDK. Insulation thrust 6 fastened with a movable contact HDS and passes through the bellows VDK and site movable seals 12 hollow insulator. Sealed chamber has a safety device 13, supports the required pressure inside the hollow insulator, for example, the safety valve.

Sealed chamber formed by the first flange 3 hollow insulator 2 tightly fasten with flange 8A insulator VDK its fixed contact 10, and his second flange 4 - m switch. Here VDK is located inside a sealed chamber (Fig.1). But she may be situated outside the sealed chamber (figure 2). Then the first flange 3 hollow insulator tightly fasten with flange 86 insulator VDK from her rolling pin 9 his second flange 4 - m switch.

Outside of the hollow insulator gas pressure can be any in accordance with specific technical requirements of the switch on ambient temperature and dimensions. Inside this isolator in a sealed chamber pressure is chosen from the condition of allowable pressure for reliable operation of VDK.

Operation switching on and off switch is performed by means of transmission through the insulating rod 6 passing through the bellows 11 and node movable seals 12, momentum from the actuator to the movable contact HDS 9. Bellows provides the tightness of the vacuum arc chute and not experiencing dangerous mechanical loads, because within him as well as inside the hollow insulator gas pressure low or gas was replaced with insulating liquid. The same can be said about the site movable seals.

1. Б vacuum switch, containing at least one gas-filled tank, placed inside it hollow insulator, forming a sealed chamber, vacuum arc chute (VDK), which comprise the insulator with two flanges, with one flange hermetically sealed with the first flange hollow insulator, located inside insulator VDK moving and fixed contacts and bellows, tightly connected to the flange of the isolator VDK, insulating rod, tied with a movable contact and passing through the bellows VDK and node rolling sealing the hollow insulator, wherein the second flange hollow insulator also hermetically sealed with gas filled tank circuit breaker.

2. Б vacuum switch according to claim 1, characterized in that the vacuum arc chamber is located inside the hollow insulator, his first flange hermetically sealed with flange insulator VDK its fixed contact.

3. Б vacuum switch according to claim 1, characterized in that the vacuum arc chamber is located on the outside of the hollow insulator, his first flange hermetically sealed with flange insulator VDK by sliding contact.

4. Б vacuum switch according to claim 1, characterized in that hollow insulator consists of several parts.

5. Б vacuum switch according to claim 1, wherein the hermetic chamber is equipped with a safety device.