CN106449264A - Double-break vacuum circuit breaker used for 66 KV - Google Patents

Abstract

The invention provides a double-breakage vacuum circuit breaker for 66KV, which includes two breakout devices with the same structure, each breakout device is arranged in a vacuum interrupter, the breakout device includes a static contact and a moving contact, the static contact There is a vacuum gap between the head and the moving contact, and the tails of the moving contacts on both sides are connected in series through the linkage rod, and the linkage rod is provided with a two-way repulsion mechanism and a permanent magnet holding mechanism in turn; the two-way repulsion mechanism includes a metal repulsion plate, The linkage rod is also provided with an upper fixed plate and a lower fixed plate parallel to the metal repulsive disk, and the metal repulsive disk is located between the upper fixed plate and the lower fixed plate, the lower end of the upper fixed plate is fixedly connected with the opening coil, and the lower The upper end surface of the fixed plate is fixedly connected with the closing coil. The beneficial effect is that the on-off voltage level of 66KV is realized through the double fractures. The double fractures adopt electromagnetic repulsion linkage, no mechanical lock structure, less fault sources, high reliability in use, high operating precision and synchronization of the fracture device, and the response can reach a delicate level. .

Description

A Double Break Vacuum Circuit Breaker for 66KV

technical field

The invention belongs to the field of vacuum circuit breakers, in particular to a double-break vacuum circuit breaker for 66KV.

Background technique

In the 66kV voltage level, sulfur hexafluoride (SF ₆ ) circuit breakers account for the vast majority of this voltage level, and SF ₆ is a greenhouse gas, its impact is more than 25,000 times that of CO ₂ , causing great harm to the environment, and Vacuum circuit breakers will not affect the greenhouse effect and belong to the direction of sustainable development, but it is difficult for single-break vacuum circuit breakers to achieve a voltage level of 66KV;

In vacuum circuit breakers, the breakdown voltage of the vacuum gap has a clear relationship with the gap. Experiments show that: when the gap distance is less than 0.5cm, the breakdown voltage U increases linearly with the increase of the gap distance; When is large, the gap distance and the breakdown voltage no longer have a linear relationship, as shown in Figure 1. That is to say, there is a saturation effect between the breakdown voltage and the gap length. Under the long vacuum gap, the withstand voltage level of the vacuum circuit breaker cannot be obtained by simply increasing the length of the vacuum gap. Therefore, at the 66kV voltage level, the single-break vacuum circuit breaker The device cannot meet the requirements.

Contents of the invention

In view of this, the present invention aims to propose a double-break vacuum circuit breaker for 66KV, which realizes on-off 66KV voltage level through double breaks. High reliability, high operating precision and synchronization of the fracture device, and the response can reach a subtle level.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A double-breakage vacuum circuit breaker for 66KV, comprising two breakout devices with the same structure, each breakout device is arranged in a vacuum interrupter, the breakout device includes a static contact and a moving contact, the There is a vacuum gap between the static contact and the moving contact, and the tails of the moving contacts on both sides are connected in series through a linkage rod, and the linkage rod is provided with a two-way repulsion mechanism and a permanent magnet holding mechanism in turn;

The two-way repulsion mechanism includes a metal repulsion plate vertically connected to the linkage rod, and the linkage rod is also provided with an upper fixing plate and a lower fixing plate parallel to the metal repulsion plate, and the metal repulsion The disk is located between the upper fixed plate and the lower fixed plate, the lower end surface of the upper fixed plate is fixedly connected with the opening coil, and the upper end surface of the lower fixed plate is fixedly connected with the closing coil;

Further, the tail of the linkage rod is also provided with a permanent magnet holding mechanism, the permanent magnet holding mechanism includes a stable base and a moving iron core arranged in the stable base, a closing holding magnet and an opening holding The moving iron core is linked to the tail end of the linkage rod, the closing holding magnet is arranged on both sides of the upper end of the moving iron core, and the opening holding magnet is arranged on the moving iron core. lower sides.

Further, an overtravel device is provided on the linkage rod, and the overtravel device is arranged above the two-way repulsion mechanism.

Further, the fracture device is a 35KV fracture.

Further, the metal repulsion disk is a cylindrical copper disk.

Compared with the prior art, the double-break vacuum circuit breaker for 66KV of the present invention has the following advantages:

The invention adopts two vacuum fracture devices with the same structure, and each fracture device is a 35KV vacuum fracture, which solves the problem that a single-break vacuum circuit breaker cannot meet the voltage level of 66KV simply by increasing the vacuum gap. Compared with the sulfur hexafluoride circuit breaker The vacuum circuit breaker does not contain SF ₆ greenhouse effect gas and will not cause greenhouse pollution, and the tail ends of the moving contacts of the two fracture devices are connected in series through the linkage rod to meet the requirements of synchronization and pressure resistance, so that the 66kV One long gap of the vacuum circuit breaker becomes two short gaps, avoiding the problem of saturation between breakdown voltage and gap length.

The opening coil and closing coil of the two-way repulsion mechanism can receive control discharge signals. When opening, the opening coil discharges to generate an instantaneously changing magnetic field, and the eddy current induced by the metal repulsion disk forms a reverse magnetic field, resulting in downward repulsion ,The metal repulsion plate drives the linkage rod downward, thereby driving the moving contact of the vacuum interrupter to move downward, separating from the static contact, disconnecting the power line, and the vacuum interrupter through the excellent insulation of the inner vacuum, After the circuit is cut off from the power supply, it can quickly extinguish the arc and suppress the current; when the switch is closed, the closing coil discharges to generate an instantaneously changing magnetic field, and the eddy current induced by the metal repulsion disk forms a reverse magnetic field, resulting in an upward repulsion force, which is generated by the metal repulsion force The plate moves upward to drive the linkage rod, thereby driving the moving contact of the vacuum interrupter to move upward, contact with the static contact, and connect the power line. The moving contact driven by the two-way repulsion mechanism has an opening time of less than 5ms and a closing time of less than 10ms. The response reaches a delicate level, and the operation is precise and fast.

The moving iron core of the permanent magnet holding mechanism can move with the tail of the linkage rod. When the linkage rod opens downward, the moving iron core can be attracted to the opening holding magnet below to maintain the opening position of the moving contact; When the linkage rod closes upwards, the moving iron core can be attracted to the closing holding magnet above it to keep the closing position of the moving contact. It is helpful to maintain the accuracy of the opening or closing position of the moving contact and achieve the effect of self-maintenance.

The overtravel device is an existing device, which helps to ensure the contact pressure and reduce the contact resistance.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a diagram showing the relationship between breakdown voltage or breakdown electric field strength and vacuum gap length;

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Explanation of reference signs:

1-fracture device; 11-static contact; 12-moving contact; 13-vacuum gap; 2-vacuum interrupter; 3-linkage rod; 4-two-way repulsion mechanism; Fixed plate; 43-lower fixed plate; 44-opening coil; 45-closing coil; 5-permanent magnet holding mechanism; 51-stable base; 52-moving magnet; 53-closing holding magnet; 54-opening Holding magnet; 6 - Overtravel device.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in Figure 2, the present invention provides a double-breakage vacuum circuit breaker for 66KV, which includes two breakout devices 1 with the same structure, each of which is set in a vacuum interrupter 2, said The fracture device 1 includes a static contact 11 and a moving contact 12, a vacuum gap 13 is left between the static contact 11 and the moving contact 12, and the tails of the moving contacts 12 on both sides pass through the linkage rod 3 connected in series, the linkage rod 3 is sequentially provided with a two-way repulsion mechanism 4 and a permanent magnet holding mechanism 5;

The two-way repulsion mechanism 4 includes a metal repulsion disk 41 vertically connected to the linkage rod 3, and the linkage rod 3 is also provided with an upper fixing plate 42 and a lower fixing plate parallel to the metal repulsion disk 41 43, and the metal repulsion plate 41 is located between the upper fixing plate 42 and the lower fixing plate 43, the lower end surface of the upper fixing plate 42 is fixedly connected with the opening coil 44, the lower fixing plate 43 The upper end face is fixedly connected with a closing coil 45;

The tail portion of the linkage rod 3 is also provided with a permanent magnet holding mechanism 5, and the permanent magnet holding mechanism 5 includes a stable base 51, a moving iron core 52 arranged in the stable base 51, and a closing holding magnet 53. and the opening holding magnet 54, the moving iron core 52 is linked to the tail end of the linkage rod 3, the closing holding magnet 53 is arranged on both sides of the upper end of the moving iron core 52, and the opening holding The magnets 54 are arranged on both sides of the lower end of the moving iron core 52 .

An overtravel device 6 is provided on the linkage rod 3 , and the overtravel device 6 is arranged above the two-way repulsion mechanism 4 .

The fracture device 1 is a 35KV fracture.

The metal repulsion disk 41 is a cylindrical copper disk.

The working process of this example: the opening coil 44 and closing coil 45 of the two-way repulsion mechanism 4 receive the control discharge signal. Towards the magnetic field, resulting in a downward repulsion force, the metal repulsion plate 41 drives the linkage rod 3 to move downward, thereby driving the moving contact 12 of the vacuum interrupter 2 to move downward, separating from the static contact 11, and disconnecting For power lines, the vacuum interrupter 2 quickly extinguishes the arc and suppresses the current through the insulation of the inner vacuum. The moving iron core 52 connected to the tail end of the linkage rod 3 is attracted to the opening holding magnet 54 below to keep the moving contact 12 When the switch is closed, the closing coil 45 discharges to generate an instantaneously changing magnetic field, and the eddy current induced by the metal repulsion disk 41 forms a reverse magnetic field, resulting in an upward repulsion force, which is driven upward by the metal repulsion disk 41 The rod moves, thereby driving the moving contact 12 of the vacuum interrupter 2 to move upward, contacting the static contact 11, and connecting the power line, the moving iron core 52 is attracted to the closing holding magnet 53 above, and the moving contact 12 is kept Closed position.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (5)

1. a kind of double-fracture formula vacuum circuit breaker for 66KV, it is characterised in that：Including two structure identical fracture devices, Each described fracture device is arranged in vacuum extinction room, and the fracture device includes static contact and moving contact, the static contact Vacuum gap is left and the moving contact between, and the moving contact afterbody of both sides is connected in series by trace, the gearing Bar is provided with two-way repulsive force mechanism；

The two-way repulsive force mechanism includes the metal repulsion dish being vertically connected on the trace, also sets up on the trace Be parallel to upper mounted plate and the bottom plate of the metal repulsion dish, and the metal repulsion dish be located at fixed plate and Between the bottom plate, the lower surface of fixed plate is fixedly connected with switching winding, the upper surface of the bottom plate It is fixedly connected with closing coil.

2. the double-fracture formula vacuum circuit breaker for 66KV according to claim 1, it is characterised in that：The trace Afterbody is additionally provided with permanent magnet maintaining body, and the permanent magnet maintaining body includes stabilizing base and is arranged at the stabilizing base Interior dynamic iron core, combined floodgate keep Magnet and separating brake to keep Magnet, and the dynamic iron core is connected in the tail end of the trace, institute Stating combined floodgate keeps Magnet to be arranged on dynamic iron core upper end both sides, and the separating brake keeps Magnet to be arranged on the lower end of the dynamic iron core Both sides.

3. the double-fracture formula vacuum circuit breaker for 66KV according to claim 1, it is characterised in that：On the trace Excess of stroke device is provided with, the excess of stroke device is arranged on the top of the two-way repulsive force mechanism.

4. the double-fracture formula vacuum circuit breaker for 66KV according to claim 1 or 2 any one, it is characterised in that：Institute Fracture device is stated for 35KV fracture.

5. the double-fracture formula vacuum circuit breaker for 66KV according to claim 1 or 2 any one, it is characterised in that：Institute Metal repulsion dish are stated for cylindrical copper dish.