A non-contact arc current closing auxiliary contact device for isolating switch

Abstract

The invention discloses a non-contact arc current closing auxiliary contact device for an isolating switch, comprising a static contact mechanism and a moving contact mechanism, wherein a discharge mechanism is arranged between the static contact mechanism and the moving contact mechanism; the static contact mechanism comprises a first insulating support, a mounting frame and a static contact, wherein the mounting frame is arranged on the first insulating support, and the static contact is arranged on the mounting frame; the moving contact mechanism comprises a second insulating support and a conductive rod, wherein a driving device is arranged on the second insulating support, wherein a moving contact is arranged at one end of the conductive rod, and the other end of the conductive rod is transmission-connected with the driving device to drive the moving contact and the static contact to perform opening or closing movements; the discharge mechanism comprises a static arc-starting rod and a moving arc-starting rod, wherein one end of the moving arc-starting rod is connected to the conductive rod, and the other end extends beyond the end face of the moving contact, and one end of the static arc-starting rod is fixedly connected to the mounting frame, and the other end extends toward the moving arc-starting rod and beyond the end face of the static contact.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and in particular to a non-contact arc current closing auxiliary contact device for an isolating switch, and more specifically to a high-voltage arc-starting device suitable for a high-voltage direct current isolating switch in a flexible direct current power transmission project under the condition of transient attenuation current after closing and breakdown at a normal break voltage. Background Art

[0002] With the development of flexible DC transmission, DC transmission projects have begun to implement demonstrations of flexible DC transmission projects that can be networked and operated, which can realize the access and exit of multiple power sources, loads and storage devices at any time, and realize the energy complementarity and efficient utilization of networks and pieces. In this process, more voltage and current closing requirements for special conversion conditions are also proposed for DC disconnectors. One of them is that the DC disconnector is required to have the ability to close the break voltage of 550kVdc and the breakdown current I=2.5et / 0.03sin(180π×t)kA. Generally speaking, the disconnector can only carry a very small (about 1-2A) arc current during the closing and opening process, and cannot withstand excessive current, otherwise the moving and static contacts of the disconnector will be burned and cannot be operated normally. Therefore, a special solution is needed for this special condition to enable the disconnector to have the ability to close the break voltage of 550kVdc and the breakdown current I=2.5et / 0.03sin(180π×t)kA without burning the main contacts and other components. Summary of the invention

[0003] The object of the present invention is to provide a non-contact arc current closing auxiliary contact device for a disconnector to solve the problem that the moving contact and the static contact of a conventional disconnector are prone to failure due to severe ablation when the closing voltage is 550kVdc and the breakdown current is I=2.5et / 0.03sin(180π×t)kA.

[0004] The technical solution adopted by the present invention is: a non-contact arc current closing auxiliary contact device for an isolating switch, comprising a static contact mechanism and a moving contact mechanism, wherein a discharge mechanism is provided between the static contact mechanism and the moving contact mechanism;

[0005] The static contact mechanism comprises a first insulating support, a mounting frame and a static contact, wherein the mounting frame is arranged on the first insulating support, and the static contact is arranged on the mounting frame;

[0006] The moving contact mechanism comprises a second insulating support and a conductive rod, the second insulating support is provided with a driving device, one end of the conductive rod is provided with a moving contact, and the other end of the conductive rod is transmission-connected with the driving device to drive the moving contact and the static contact to perform opening or closing movements;

[0007] The discharge mechanism includes a static arc-striking rod and a moving arc-striking rod, one end of the moving arc-striking rod is connected to the conductive rod, and the other end extends and exceeds the end surface of the moving contact; one end of the static arc-striking rod is fixedly connected to the mounting frame, and the other end extends toward the moving arc-striking rod and exceeds the end surface of the static contact.

[0008] Further optimization, the first insulating pillar is provided with a first equalizing ring, and the first equalizing ring is arranged on both sides of the moving arc rod in the closed state, and the second insulating pillar is provided with a second equalizing ring, and the second equalizing ring is arranged on both sides of the moving arc rod in the open state.

[0009] Further optimization is performed, the top ends of the static arc-striking rod and the dynamic arc-striking rod are both pointed structures.

[0010] Further optimization, the top tips of the static arc-striking rod and the dynamic arc-striking rod are both made of copper-tungsten alloy material.

[0011] Further optimization, the static arc-striking rod is located outside the movement path of the dynamic arc-striking rod.

[0012] Further optimization, the conductive rod is a foldable telescopic rod.

[0013] Further optimized, the first insulating support is an insulator.

[0014] Further optimized, the second insulating support includes a moving side insulator and an operating insulator, and the driving device is fixed on the top of the moving side insulator and the operating insulator.

[0015] The beneficial effects of the present invention are as follows: by providing a discharge mechanism between the static contact mechanism and the moving contact mechanism, during the closing process, when the conductive rod approaches the static contact until the distance is less than a certain distance, since the fracture voltage is very high, discharge breakdown will occur between the conductive rod and the static contact. At this time, since the moving arc-striking rod attached to the conductive rod is more prominent, and since the static arc-striking rod attached in front of the static contact is also more prominent, the distance between the two is closest, so the discharge will occur between the moving arc-striking rod and the static arc-striking rod, thereby avoiding discharge occurring at other positions and causing the moving contact and the static contact or other positions to be burned by the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the discharge structure when the conductive rod approaches the static contact;

[0019] Figure 3 It is a structural schematic diagram of the closing state of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of the opening state of the invention. DETAILED DESCRIPTION

[0021] like Figure 1 and Figure 2 The non-contact arc current closing auxiliary contact device of the isolating switch shown comprises a stationary contact mechanism 100 and a moving contact mechanism 200, and a discharge mechanism is provided between the stationary contact mechanism 100 and the moving contact mechanism 200;

[0022] The static contact mechanism 100 includes a first insulating support 110, a mounting frame 120 and a static contact 130. The mounting frame 120 is arranged on the first insulating support 110, and the static contact 130 is arranged on the mounting frame 120.

[0023] The moving contact mechanism 200 includes a second insulating support 210 and a conductive rod 220. The second insulating support 210 is provided with a driving device. One end of the conductive rod 220 is provided with a moving contact 230. The other end of the conductive rod 220 is transmission-connected to the driving device to drive the moving contact 230 and the static contact 130 to perform opening or closing movements.

[0024] The discharge mechanism includes a static arc-striking rod 310 and a moving arc-striking rod 320. One end of the moving arc-striking rod 320 is connected to the conductive rod 220, and the other end extends and exceeds the end surface of the moving contact 230. One end of the static arc-striking rod 310 is fixedly connected to the mounting frame 120, and the other end extends toward the moving arc-striking rod 320 and exceeds the end surface of the static contact 130.

[0025] By providing a discharge mechanism between the static contact mechanism 100 and the moving contact mechanism 200, during the closing process, when the moving contact 230 on the conductive rod 220 approaches the static contact 130 under the action of the driving device until the distance is less than a certain distance, since the fracture voltage is very high, a discharge breakdown will occur between the conductive rod 220 and the static contact 130. At this time, since the moving arc-striking rod 320 attached to the conductive rod 220 is more prominent, and since the static arc-striking rod 310 attached to the front of the static contact 130 is also more prominent, the distance between the two is the shortest, so the discharge will occur between the moving arc-striking rod 320 and the static arc-striking rod 310. In this way, it is avoided that the discharge occurs at other positions and causes the moving contact 230 and the static contact 130 or other positions to be burned by the arc.

[0026] A first equalizing ring 410 is provided on the first insulating support 110, and the first equalizing ring 410 is arranged on both sides of the moving arc-striking rod 320 in the closed state. A second equalizing ring 420 is provided on the second insulating support 210, and the second equalizing ring 420 is arranged on both sides of the moving arc-striking rod 320 in the open state.

[0027] like Figure 3As shown, the moving contact 230 is in contact with the static contact 130 when the circuit is closed, while the static arc-striking rod 310 and the moving arc-striking rod 320 are not in contact after closing. At this time, the moving arc-striking rod 320 with a pointed end is wrapped in the protection range of the first grading ring 410, and no tip discharge is caused.

[0028] During the opening process, the static arc-striking rod 310 and the dynamic arc-striking rod 320 do not need to function. Figure 4 As shown, at this time, the moving arc-starting rod 320 is shielded within the range of the second voltage-equalizing ring 420, and no tip discharge is caused.

[0029] The tops of the static arc-striking rod 310 and the moving arc-striking rod 320 are both pointed structures. The tops of the arc-striking rod 310 and the moving arc-striking rod 320 are designed to be pointed structures in order to facilitate better tip discharge.

[0030] The tips of the static arc-starting rods 310 and the dynamic arc-starting rod 320 are made of a copper-tungsten alloy material that is heat-resistant to 3000 degrees, and can withstand the local high temperature caused by the arc, and avoid the high temperature from ablation of the tips of the static arc-starting rod 310 and the dynamic arc-starting rod 320. Of course, other high-temperature resistant materials can also be selected, which are equivalent replacements for the present invention and still fall within the scope of protection.

[0031] The static arc-starting rod 310 is located outside the moving path of the moving arc-starting rod 320. Since the arc decays exponentially quickly after the break is broken, the arc is maintained for a very short time, so the arc will be automatically extinguished instantly. Therefore, the moving arc-starting rod 320 and the static arc-starting rod 310 will not come into contact during the closing process, and the moving contact 230 and the static contact 130 will not be burned by the arc.

[0032] At the same time, when closing the circuit breaker, the static arc-striking rod 310 and the moving arc-striking rod 320 are staggered, which also makes it easier for the moving contact 230 and the static contact 130 to make contact when closing the circuit breaker.

[0033] The conductive rod 220 is a foldable telescopic rod. The conductive rod 220 includes two sections, and the opposite ends are connected by a folding drive device. The folding drive device folds the two sections of the conductive rod 220, and the switch is closed or opened under the joint action of the drive device and the folding drive device.

[0034] The first insulating support 110 is preferably an insulator, and of course other supports with insulating functions can also be selected. The insulator plays a supporting role and enables the entire switch to have better withstand voltage and mechanical stress.

[0035] The second insulating support 210 includes a moving side insulator 211 and an operating insulator 212, and the driving device is fixedly arranged on the top of the moving side insulator 211 and the operating insulator 212. The second insulating support 210 is composed of the side insulator 211 and the operating insulator 212, and has a better stable supporting effect, so that the driving device on the top can work more stably.

[0036] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A non-contact arc current closing auxiliary contact device for an isolating switch, characterized in that: It comprises a static contact mechanism (100) and a movable contact mechanism (200), wherein a discharge mechanism is provided between the static contact mechanism (100) and the movable contact mechanism (200); The stationary contact mechanism (100) comprises a first insulating support (110), a mounting frame (120) and a stationary contact (130); the mounting frame (120) is arranged on the first insulating support (110), and the stationary contact (130) is arranged on the mounting frame (120); The moving contact mechanism (200) comprises a second insulating support (210) and a conductive rod (220); the second insulating support (210) is provided with a driving device; one end of the conductive rod (220) is provided with a moving contact (230); the other end of the conductive rod (220) is drivingly connected to the driving device to drive the moving contact (230) and the static contact (130) to perform opening or closing movements; the conductive rod (220) is a foldable telescopic rod; The discharge mechanism comprises a static arc-striking rod (310) and a dynamic arc-striking rod (320); one end of the dynamic arc-striking rod (320) is connected to the conductive rod (220), and the other end extends beyond the end surface of the dynamic contact (230); one end of the static arc-striking rod (310) is fixedly connected to the mounting frame (120), and the other end extends in the direction of the dynamic arc-striking rod (320) and beyond the end surface of the static contact (130); the static arc-striking rod (310) is located outside the movement path of the dynamic arc-striking rod (320).

2. The non-contact arc current closing auxiliary contact device for disconnector according to claim 1, characterized in that: The first insulating support (110) is provided with a first voltage-equalizing ring (410), and the first voltage-equalizing ring (410) is arranged on both sides of a moving arc-striking rod (320) in a closed state. The second insulating support (210) is provided with a second voltage-equalizing ring (420), and the second voltage-equalizing ring (420) is arranged on both sides of the moving arc-striking rod (320) in an open state.

3. The non-contact arc current closing auxiliary contact device for disconnecting switch according to claim 1 or 2, characterized in that: The top ends of the static arc-striking rod (310) and the movable arc-striking rod (320) are both pointed structures.

4. The non-contact arc current closing auxiliary contact device for disconnector according to claim 3, characterized in that: The top ends of the static arc-striking rod (310) and the moving arc-striking rod (320) are both made of copper-tungsten alloy material.

5. The non-contact arc current closing auxiliary contact device for disconnecting switch according to claim 1 or 2, characterized in that: The first insulating support (110) is an insulator.

6. The non-contact arc current closing auxiliary contact device for disconnecting switch according to claim 1 or 2, characterized in that: The second insulating support (210) comprises a moving-side insulator (211) and an operating insulator (212), and the driving device is fixedly arranged on the top of the moving-side insulator (211) and the operating insulator (212).

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