CN113012973A - Isolating switch with high-current switching-on and switching-off capacity - Google Patents
Isolating switch with high-current switching-on and switching-off capacity Download PDFInfo
- Publication number
- CN113012973A CN113012973A CN202110217336.3A CN202110217336A CN113012973A CN 113012973 A CN113012973 A CN 113012973A CN 202110217336 A CN202110217336 A CN 202110217336A CN 113012973 A CN113012973 A CN 113012973A
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- Prior art keywords
- contact
- static
- arc
- moving
- current
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- 230000003068 static effect Effects 0.000 claims abstract description 79
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000008186 active pharmaceutical agent Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002923 metal particle Substances 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 description 10
- 238000002679 ablation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/04—Interlocking mechanisms
- H01H31/06—Interlocking mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention belongs to the technical field of isolating switches, and discloses an isolating switch with high-current breaking capacity, which comprises a static contact electric connecting device, a moving contact device, a shell and an insulating support, wherein the static contact electric connecting device and the moving contact device are arranged in the shell, and the insulating support is arranged on one side of the shell; the static contact electric connection device comprises a static side shield and a static arc contact, and a resistor disc is connected in series at one end of the static arc contact connected with the static side shield. A resistance card is connected in the static contact electric connection device in series, so that the current in an arc loop is effectively reduced, and the high-difficulty working condition of DS switching large-current bus-to-bus current is converted into the simple working condition of switching small current; the static side shielding surface is locally sprayed with an insulating layer, and an insulating sleeve in the static contact electric connecting device can prevent the resistance card loop from losing efficacy; the particle trap arranged on the inner surface of the shell can reduce the damage effect of metal particles on the insulation strength of the isolating switch in the process of moving and static contact closing and opening movements.
Description
Technical Field
The invention belongs to the technical field of isolating switches, and particularly relates to an isolating switch with high-current breaking capacity.
Background
The isolating switch is an important device matched with a circuit breaker in a transformer substation, a power transmission line and a power distribution line for use, is mainly used for ensuring the safety of the maintenance work of high-voltage equipment, and forms a large enough obvious visible air insulation interval between a part needing to be maintained and other electrified parts to form an obvious disconnection point; the isolating switch is not provided with an arc extinguishing device, if the isolating switch is operated under a load state, the contact part of the contact is ablated due to a large arc discharge phenomenon caused by the slow opening and closing speed of the moving contact and the static contact, so that the load current and the short-circuit current cannot be disconnected, otherwise, an electric arc can be formed between the contacts, and the isolating switch can be damaged.
At present, in the wiring mode of a domestic transformer substation, the operation of adopting more double buses and inverting buses is the most typical and common working condition for switching the current of the switching buses, and the operation is to use an isolating switch to open or close an electric closed loop formed by equipment with the same voltage grade and buses in the transformer substation in normal power supply operation so as to realize the operation of transferring load current.
With increasing market demands, rated bus conversion voltage (effective value) 300V and rated bus conversion current 2400A are required, and under such high parameter requirements, a relatively large electric arc is generated in the switching-off and switching-on processes of the disconnecting switch, and high temperature generated by the electric arc damages conductive parts of a moving contact and a static contact of the disconnecting switch, even an accident that the contacts are burnt occurs, so that bus current transfer operation fails.
The existing isolating switch structure generally adopts copper-tungsten contacts as a moving arc contact and a static arc contact, and resists arc ablation when a bus transfers current by means of copper-tungsten high-strength materials, so that the working conditions of the bus transfer current and low tolerance recovery voltage can be realized, but the working conditions of high recovery voltage and large transfer current in the industry can not be met, when the recovery voltage generated by the switching of the bus transfer current exceeds 100V, the internal copper-tungsten contact can be seriously ablated at continuous high temperature, even the switch fails, and the highest recovery voltage required by the industry at present can reach 300V; the moving speed between the movable contact and the fixed contact in the movable contact and the fixed contact device is also improved to shorten the burning time of electric arc when an opening bus transfers current, reduce the ablation time of an internal copper-tungsten contact and improve the opening and closing capacity.
Disclosure of Invention
The invention aims to provide an isolating switch with high-current breaking capacity, and solves the problems that the isolating switch can generate large electric arcs in the switching-on and switching-off processes, the high temperature generated by the electric arcs can damage the conducting parts of the moving contact and the static contact of the isolating switch, and even the accidents of burning the contacts occur, so that the bus current transfer operation fails.
The invention is realized by the following technical scheme:
an isolating switch with high-current breaking capacity comprises a static contact electric connecting device, a moving contact device, a shell and an insulating support, wherein the static contact electric connecting device and the moving contact device are arranged in the shell, and the insulating support is arranged on one side of the shell;
the static contact electric connection device comprises a static side shield and a static arc contact, the static side shield is fixedly connected to the insulating support, the static arc contact is arranged in the static side shield, and a resistor disc is connected to one end of the static arc contact, which is connected with the static side shield in series.
Furthermore, an insulating layer is arranged on the end face of the static side shield, which is opposite to the moving contact device.
Further, the insulating layer is a hard anodized insulating layer.
Furthermore, the moving contact device comprises a moving contact, and the static arc contact and the moving contact are oppositely arranged;
the moving contact is a hollow cylinder, a moving arc contact and a moving contact insulating sleeve are arranged at one end opposite to the direction of the static contact and in the moving contact cavity, when the isolating switch is in a switching-on state, the outer wall of the static arc contact is in contact with the inner wall of the moving contact insulating sleeve, and the main loop is in through-flow.
Further, the resistance card is fixedly connected to the static side shield through a bolt.
Further, a static contact insulating sleeve is sleeved outside the bolt.
Further, a particle trap is arranged inside the shell and right below the isolation fracture.
Further, the particle trap is detachably attached to the inner wall of the housing.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses an isolating switch with high-current breaking capacity, which comprises a static contact electric connecting device, a moving contact device, a shell and an insulating support, wherein the static contact electric connecting device is connected with the shell through a connecting rod; the static contact electric connection device comprises a static side shield and a static arc contact, and a resistor disc is connected in series at one end of the static arc contact connected with the insulating support. Because the resistance card is connected in series in the static contact electric connection device, the switching capacity of bus conversion current under various parameters can be met by adjusting the resistance value and the size of the resistance card, the current amplitude in an arc loop in the DS switching-off and switching-on processes is effectively reduced, and the ablation of arc high temperature to an arc contact is reduced; the isolating switch only adds the resistor disc on the original structure, has the characteristics of simple structure, strong operability, low cost and stable and reliable contact, converts the high-difficulty working condition of DS opening and closing large current into the simple working condition of opening and closing small current, and obviously reduces the extreme requirement of high parameters on the DS performance. The design of the resistance card is added in the DS switching loop, so that the current amplitude of the electric arc is reduced, the ablation of the arc contact in the DS normal switching process is obviously reduced, the service life of the contact is prolonged, and the application reliability and safety of the isolating switch are improved.
Furthermore, an insulating layer is sprayed on the local part of the surface of the static side shielding, so that the effect that the electric arc drifts to the surface of the static side shielding, the electric arc loop is instantly switched to the through-flow main loop and the current is increased due to the reduction of the resistance value of the through-flow loop, so that the failure of the resistance card loop is caused in the arc discharge process of the movable arc contact and the static arc contact is prevented.
Furthermore, a moving contact insulating sleeve is arranged in the moving contact, and when the isolating switch is in a switching-on state, the outer wall of the static arc contact is in contact with the inner wall of the moving contact insulating sleeve, so that reliable through flow of a main current loop can be ensured.
Furthermore, set up the insulating cover of static contact outside the bolt, prevent that the electric current from leading to resistance card return circuit failure through the bolt shielding switch-on from the quiet side.
Furthermore, a particle trap is arranged on the inner surface of the shell and used for absorbing metal particles generated in the process of the closing and opening of the moving contact and the fixed contact of the isolating switch and reducing the damage effect of the particles on the insulating strength of the isolating switch.
Drawings
FIG. 1 is a schematic structural diagram of an open state of a disconnector according to the present invention;
FIG. 2 is a schematic diagram of the structure of the on/off state of the isolating switch according to the present invention;
fig. 3 is a schematic structural view of the electrical connection device for a stationary contact according to the present invention.
Wherein, 1 is an insulating support; 2, static side shielding; 3 is a shell; 4 is a moving contact; 5 is a driving mechanism; 6 is a movable contact seat; 7 is a moving contact insulating sleeve; 8 is a moving arc contact; 9 is a spring contact; 10 is a static arc contact; a static contact insulating sleeve 11; 12 is a resistor disc, 13 is an insulating layer, and 14 is a bolt.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1 and 2, the invention discloses an isolating switch with high current breaking capability, which comprises a static contact electric connection device, a moving contact device, a driving mechanism 5, a housing 3 and an insulating support 1, wherein the static contact electric connection device and the moving contact device are arranged in the housing 3, and the insulating support 1 is arranged on one side of the housing 3. The static contact electric connecting device is arranged at the position opposite to the moving contact device, and the other end of the static contact electric connecting device is arranged with the shell 3 through the insulating support 1.
The static contact electric connection device comprises a static side shield 2, a spring contact 9 and a static arc contact 10; the static side shield 2 is fixedly connected to the insulating support 1, the static arc contact 10 is arranged in the static side shield 2, and a resistor disc 12 is connected in series at one end of the static arc contact 10 connected with the static side shield 2. The bus conversion current switching capacity under various parameters can be met by adjusting the resistance value and the size of the resistance card 12, the current amplitude in an arc loop in the DS switching-off and switching-on processes is effectively reduced, and the ablation of the arc contact caused by high temperature of the arc is reduced. The resistance card 12 is only additionally arranged on the original structure, has the characteristics of simple structure, strong operability, low cost and stable and reliable contact, converts the high-difficulty working condition of the DS switching large current into the simple working condition of the DS switching small current, and obviously reduces the extreme requirement of the high parameter on the DS performance.
Preferably, the moving contact device comprises a moving contact 4, a moving arc contact 8, a moving contact insulating sleeve 7 and a moving contact base 6, the moving contact 4 is a hollow cylinder, the moving arc contact 8 and the moving contact insulating sleeve 7 are sequentially installed at the end of the inner wall of the moving contact in the direction opposite to the static contact, and when the isolating switch is in a switching-on state, the outer wall of the static arc contact 10 is in contact with the inner wall of the moving contact insulating sleeve 7, so that reliable through flow of a main current loop is ensured.
The movable contact seat 6 is arranged in the middle of the cavity of the shell, the movable contact 4 is positioned in the center of the movable contact seat 6, the movable contact 4 drives the embedded movable arc contact 8 and the movable contact insulating sleeve 7 to do linear reciprocating motion along the axis of the movable contact seat 6 along the rotation of the driving mechanism 5, and the movable contact can be communicated and separated with the spring contact 9 and the static arc contact 10 of the static contact electric connection device, so that the closing and opening states of the isolating switch are realized.
Preferably, as shown in fig. 3, an insulating layer 13 is sprayed on a local position of one end face of the static side shield 2, which faces the movable contact 4, in the static contact electrical connection device, and a hard anodic oxidation insulating layer can be adopted to prevent the arc from drifting to the surface of the static side shield 2 in the arc discharge process of the movable arc contact 8 and the static arc contact 10, the arc loop is instantly switched to the through-flow main loop, and the current is increased due to the decrease of the resistance value of the through-flow loop, so that the loop of the resistance card 12 fails.
Preferably, as shown in fig. 3, the resistor 12 is fixedly connected to the stationary shield 2 by a bolt 14, and a stationary contact insulating sleeve 11 is sleeved outside the bolt 14 to prevent current from being conducted from the stationary shield 2 by the bolt 14 and causing failure of the resistor loop.
Preferably, a particle trap is arranged on the inner side of the shell 3 and right below the isolation fracture and used for absorbing metal particles generated in the process of closing and opening of the moving contact and the fixed contact of the isolation switch and reducing the damage effect of the particles on the insulation strength of the isolation switch.
Specifically, the particle trap is detachably attached to the inner wall of the housing 3, and after a period of use, the metal particles on the particle trap are removed and then mounted on the inner wall of the housing 3.
Claims (8)
1. An isolating switch with high-current breaking capacity is characterized by comprising a static contact electric connecting device, a moving contact device, a shell (3) and an insulating support (1), wherein the static contact electric connecting device and the moving contact device are arranged in the shell (3), and the insulating support (1) is arranged on one side of the shell (3);
the static contact electric connection device comprises a static side shield (2) and a static arc contact (10), the static side shield (2) is fixedly connected to the insulating support (1), the static arc contact (10) is arranged in the static side shield (2), and a resistor disc (12) is connected in series at one end, connected with the static side shield (2), of the static arc contact (10).
2. A disconnector with high current breaking capacity according to claim 1, characterized in that the static shield (2) is provided with an insulating layer (13) at its end facing the movable contact means.
3. A high current breaking capability disconnector according to claim 2, characterized in that the insulating layer (13) is a hard anodized insulating layer.
4. A disconnector with high current breaking capacity according to claim 1, characterized in that the movable contact means comprises a movable contact (4), the stationary arcing contact (10) and the movable contact (4) being arranged opposite to each other;
the moving contact (4) is a hollow cylinder, a moving arc contact (8) and a moving contact insulating sleeve (7) are arranged in a cavity of the moving contact (4) at one end opposite to the direction of the fixed contact, when the isolating switch is in a switching-on state, the outer wall of the static arc contact (10) is in contact with the inner wall of the moving contact insulating sleeve (7), and the main loop is in through-flow.
5. A high current breaking capability disconnector according to claim 1, characterized in that the resistive sheet (12) is fixedly attached to the static side shield (2) by means of bolts (14).
6. A high current breaking capability disconnector according to claim 5, characterized in that a stationary contact insulating sleeve (11) is provided around the bolt (14).
7. A disconnector with high current breaking capacity according to claim 1, characterized in that a particle trap is arranged inside the housing (3) and directly below the isolating break.
8. A high current breaking capability disconnector according to claim 7, characterized in that the particle trap is detachably connected to the inner wall of the housing (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217336.3A CN113012973A (en) | 2021-02-26 | 2021-02-26 | Isolating switch with high-current switching-on and switching-off capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217336.3A CN113012973A (en) | 2021-02-26 | 2021-02-26 | Isolating switch with high-current switching-on and switching-off capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113012973A true CN113012973A (en) | 2021-06-22 |
Family
ID=76386376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110217336.3A Pending CN113012973A (en) | 2021-02-26 | 2021-02-26 | Isolating switch with high-current switching-on and switching-off capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113012973A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115312348A (en) * | 2022-09-06 | 2022-11-08 | 广东电网有限责任公司惠州供电局 | A kind of movable grounding knife switch and using method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88103210A (en) * | 1987-05-27 | 1988-12-07 | 西门子公司 | Vacuum switch tube with encapsulation |
| JPH025244U (en) * | 1988-06-23 | 1990-01-12 | ||
| CN1049748A (en) * | 1989-08-24 | 1991-03-06 | 三菱电机株式会社 | breaker |
| CN1674186A (en) * | 2005-03-28 | 2005-09-28 | 西安杉瑞机电科技有限责任公司 | Method for limiting internal fast transient overvoltage of gas insulating switch |
| CN2896495Y (en) * | 2006-03-20 | 2007-05-02 | 西安西开高压电气股份有限公司 | Arc-chutes of 800 kv double-fracture can-type circuit breaker |
| CN201673849U (en) * | 2010-03-16 | 2010-12-15 | 新东北电气集团高压开关有限公司 | Sulfur hexafluoride ultra-high voltage resistive small-current on-off switch |
| CN102024610A (en) * | 2009-09-09 | 2011-04-20 | 日本Ae帕瓦株式会社 | Circuit breaker |
| CN202502916U (en) * | 2012-03-01 | 2012-10-24 | 上海旭然电器有限公司 | High-voltage earthing switch with shielding covers |
| CN207834192U (en) * | 2018-01-06 | 2018-09-07 | 北海银河开关设备有限公司 | A kind of electric locomotive earthing switch pole |
| CN111128592A (en) * | 2020-01-17 | 2020-05-08 | 正泰电气股份有限公司 | three-position switch |
-
2021
- 2021-02-26 CN CN202110217336.3A patent/CN113012973A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88103210A (en) * | 1987-05-27 | 1988-12-07 | 西门子公司 | Vacuum switch tube with encapsulation |
| JPH025244U (en) * | 1988-06-23 | 1990-01-12 | ||
| CN1049748A (en) * | 1989-08-24 | 1991-03-06 | 三菱电机株式会社 | breaker |
| CN1674186A (en) * | 2005-03-28 | 2005-09-28 | 西安杉瑞机电科技有限责任公司 | Method for limiting internal fast transient overvoltage of gas insulating switch |
| CN2896495Y (en) * | 2006-03-20 | 2007-05-02 | 西安西开高压电气股份有限公司 | Arc-chutes of 800 kv double-fracture can-type circuit breaker |
| CN102024610A (en) * | 2009-09-09 | 2011-04-20 | 日本Ae帕瓦株式会社 | Circuit breaker |
| CN201673849U (en) * | 2010-03-16 | 2010-12-15 | 新东北电气集团高压开关有限公司 | Sulfur hexafluoride ultra-high voltage resistive small-current on-off switch |
| CN202502916U (en) * | 2012-03-01 | 2012-10-24 | 上海旭然电器有限公司 | High-voltage earthing switch with shielding covers |
| CN207834192U (en) * | 2018-01-06 | 2018-09-07 | 北海银河开关设备有限公司 | A kind of electric locomotive earthing switch pole |
| CN111128592A (en) * | 2020-01-17 | 2020-05-08 | 正泰电气股份有限公司 | three-position switch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115312348A (en) * | 2022-09-06 | 2022-11-08 | 广东电网有限责任公司惠州供电局 | A kind of movable grounding knife switch and using method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210622 |