CN109411263B - Static contact, rotary blade type isolating switch and high-voltage combined electrical apparatus - Google Patents
Static contact, rotary blade type isolating switch and high-voltage combined electrical apparatus Download PDFInfo
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- CN109411263B CN109411263B CN201811295647.6A CN201811295647A CN109411263B CN 109411263 B CN109411263 B CN 109411263B CN 201811295647 A CN201811295647 A CN 201811295647A CN 109411263 B CN109411263 B CN 109411263B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/04—Co-operating contacts of different material
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Abstract
The device comprises a fixed contact, a rotary blade type isolating switch and a high-voltage combined electrical appliance, wherein an elastic watchband contact finger is arranged on one side, facing a moving contact, of the fixed contact of the isolating switch; or the arc-drawing position of the static contact is provided with an elastic copper-tungsten alloy contact finger, and the copper-tungsten alloy contact finger covers the whole arc-drawing position of the static contact; the structure can ensure that the isolating switch can perform switching action more safely in the mother-falling operation, and avoid the ablation and melting of the moving contact and the static contact; the structure is simple and reliable, the requirements on processing and mounting precision are not very high, and the reliability of the device in long-term operation is facilitated.
Description
Technical Field
The invention relates to the field of high-voltage combined electrical appliance products, in particular to an isolating switch of a high-voltage combined electrical appliance.
Background
At present, in a high-voltage combined electrical appliance product, a rotary blade type structure is mostly adopted by an isolating switch, and a moving contact and a static contact realize electric contact through a watchband contact finger. When the disconnector performs a busbar reversing operation (the busbar reversing operation refers to a switching operation of a load in a double-busbar system from one busbar system to another busbar system), a certain current and voltage exist on a fracture of the disconnector, and an arc is generated. The common watchband contact finger static contact structure can only meet the requirements of smaller bus conversion voltage and current, and when fracture voltage is larger, the contact is seriously ablated along with the gradual increase of operation times, so that the performance of a product is reduced.
Patent application No. 201320435914.1 entitled "isolating switch and high-voltage switchgear" discloses an isolating switch and high-voltage switchgear, wherein the isolating switch comprises a shell, a moving contact and a static contact which are arranged in the shell, and the moving contact and the static contact are respectively provided with a copper-tungsten alloy sheet. This patent application is through corresponding the copper tungsten alloy piece that sets up on moving contact and static contact, because the melting point of copper tungsten alloy piece is high, can guarantee to carry out the switching action safely under the temperature of arcing to hope to avoid appearing the arc point of drawing of moving contact and static contact through this mode and melt, improve isolator's reliability.
However, in practical application, in order to ensure that the movable contact rotates smoothly, an axial gap exists between the movable contact and the static contact, and an elastic watchband contact finger arranged on one side of the static contact facing the movable contact is the part closest to the movable contact on the static contact, and the first contact point when the contact is switched on and the last contact point when the contact is switched off are watchband contact fingers instead of a static contact copper-tungsten contact piece, so that the watchband contact finger is actually the arc extinguishing point of an electric arc in the switching-on/switching-off process.
In addition, if the protruding height of the surface of one side, facing the moving contact, of the copper-tungsten alloy sheet on the fixed contact in the patent application is designed to be consistent with the protruding height of the contact finger of the belt during closing/opening, the copper-tungsten alloy sheet can theoretically become an arc quenching point of an electric arc in the closing/opening process, but in practical application, the copper-tungsten alloy sheet is influenced by machining precision, installation precision, external environment and the like, so that the high matching precision requirement is difficult to achieve, and the reliability of the isolating switch in the long-term use process is difficult to ensure.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a static contact, a rotary blade type isolating switch and a high-voltage combined electrical appliance, which can ensure that the isolating switch can perform switching action more safely in a mother-falling operation, and avoid the ablation and melting of a moving contact and the static contact.
The invention is realized by the following technical scheme:
isolator's static contact, isolator's static contact is equipped with elastic watchband towards one side of moving contact and touches and indicates, and during isolator closes/separating brake, the first/last contact position between moving contact and the static contact is the arc position that draws of moving contact and static contact respectively, its characterized in that:
the arc-drawing position of the static contact is provided with a copper-tungsten alloy sheet, and the copper-tungsten alloy sheet of the static contact elastically extends out of the copper-tungsten alloy contact finger towards the outside of one side of the moving contact;
or the arc-drawing position of the static contact is provided with an elastic copper-tungsten alloy contact finger, and the copper-tungsten alloy contact finger covers the whole arc-drawing position of the static contact;
when the isolating switch is switched on, the two copper-tungsten alloy contact fingers elastically press the arc-drawing position of the moving contact, the watchband contact finger is contacted with the moving contact, and the copper-tungsten alloy contact finger is always attached to the arc-drawing position of the moving contact in the switching-on process; when the brake is switched off, the contact finger of the watchband is firstly separated from the contact with the moving contact, and the contact finger of the copper-tungsten alloy is separated from the contact with the arc-drawing position of the moving contact and elastically returns to the initial position.
In the first parallel technical scheme, except that a copper-tungsten alloy sheet is arranged on a static contact, an elastic copper-tungsten alloy contact finger is additionally arranged at the front end of a watchband contact finger of a static contact, when an isolating switch starts to be switched on, when a moving contact is close to the static contact within a certain distance, an electric arc is firstly generated between the moving contact and the copper-tungsten alloy sheet of the static contact, in the switching-on process, the copper-tungsten alloy contact finger is in contact with an arc-drawing position of the moving contact before the watchband contact finger, and an arc-extinguishing point is located on the copper-tungsten alloy contact finger; in the brake-separating process, the watchband contact finger is separated from the movable contact before the copper-tungsten alloy contact finger until the copper-tungsten alloy contact finger is separated from the arc-pulling position of the movable contact, electric arcs begin to be generated between the copper-tungsten alloy contact finger and the movable contact after separation, and the electric arcs are extinguished when the movable contact is separated from the fixed contact to a certain distance. The arc starting point falls on the copper-tungsten alloy contact finger.
In the parallel technical scheme II, only elastic copper-tungsten alloy contact fingers are arranged at the arc-pulling position of the static contact, when the isolating switch starts to be switched on, when the moving contact is close to the static contact within a certain distance, electric arcs are generated between the arc-pulling position of the moving contact and the copper-tungsten alloy contact fingers of the static contact, when the moving contact is contacted with the copper-tungsten alloy contact fingers, the electric arcs are extinguished, and arc extinguishing points fall on the copper-tungsten alloy contact fingers; in the brake-separating process, the watchband contact finger is separated from the movable contact before the copper-tungsten alloy contact finger until the copper-tungsten alloy contact finger is separated from the arc-pulling position of the movable contact, electric arcs begin to be generated between the copper-tungsten alloy contact finger and the movable contact after separation, and the electric arcs are extinguished when the movable contact is separated from the fixed contact to a certain distance. The arc ignition point of the electric arc falls on the copper-tungsten alloy contact finger.
In summary, the first contact point when the moving contact is switched on and the last contact point when the moving contact is switched off in the two parallel technical schemes are both copper-tungsten alloy contact fingers, the arc extinguishing point is on the copper-tungsten alloy contact fingers during switching on, the moving contact is contacted with the watchband contact fingers after arc extinguishing, the moving contact is contacted and separated with the watchband contact fingers firstly during switching off and then separated from the copper-tungsten contact fingers, and the arc extinguishing point is also on the copper-tungsten alloy contact fingers, so that the watchband contact fingers are not ablated, and the performance of the isolating switch is not affected.
Furthermore, one end of the copper-tungsten alloy contact finger is fixed on the static contact, and the other end of the copper-tungsten alloy contact finger is a free end and extends out of one side of the static contact, which faces the moving contact. The improved static contact has the advantages of small modification amount on the basis of the conventional static contact, simple structure and convenient installation.
Furthermore, the copper-tungsten alloy contact finger is in a T-shaped sheet shape, two ends of the T-shaped head of the copper-tungsten alloy contact finger are respectively locked on the static contact through screws, the T-shaped tail of the copper-tungsten alloy contact finger is a free end, and when the copper-tungsten alloy contact finger is switched on, the pulling arc surface on the free end of the copper-tungsten alloy contact finger is integrally attached to the pulling arc position of the movable contact. The double-screw structure can prevent the copper-tungsten alloy contact finger from rotating; the arc-drawing surface which can be integrally attached to the arc-drawing position of the moving contact is arranged on the free end of the copper-tungsten alloy contact finger, the contact area of the copper-tungsten alloy contact finger and the arc-drawing position of the moving contact can be increased, the potential danger of poor conduction during dead point and line contact is prevented, the arc-drawing surface can be a bending surface for bending the free end of the copper-tungsten alloy contact finger, and can also be a grinding surface and a convex surface at the tail part of the free end of the copper-tungsten alloy contact finger. The structure is more suitable for being arranged on a static contact with a relatively small copper-tungsten alloy contact finger in the first parallel technical scheme, and the arc-drawing position covering the static contact is convenient to be close to one side of the watchband contact finger.
Furthermore, the copper-tungsten alloy contact finger is in a 7-shaped sheet shape, two ends of the 7-shaped head of the copper-tungsten alloy contact finger are respectively locked on the static contact through screws, the T-shaped tail of the copper-tungsten alloy contact finger is a free end, and when the copper-tungsten alloy contact finger is switched on, the pulling arc surface on the free end of the copper-tungsten alloy contact finger is integrally attached to the pulling arc position of the movable contact. Similar to the T-shaped copper-tungsten alloy contact finger, the structure is more suitable for being arranged on a stationary contact with a relatively large copper-tungsten alloy contact finger in the second parallel technical scheme, so that the whole arc-drawing position of the stationary contact can be completely covered.
Furthermore, an accommodating groove for accommodating the copper-tungsten alloy contact finger during closing is formed in one side, facing the moving contact, of the static contact and/or the copper-tungsten alloy sheet of the static contact. When the copper-tungsten alloy contact finger is elastically compressed by the arc-drawing position of the movable contact to press and retract, the copper-tungsten alloy contact finger can conveniently retract into the accommodating groove, so that the copper-tungsten alloy sheet on the static contact can be close to the arc-drawing position of the movable contact as far as possible, and an enough arc-quenching surface is ensured during arc quenching.
A rotary blade type isolating switch is characterized in that: the isolating switch comprises the fixed contact and a copper-tungsten alloy sheet arranged at the arcing position of the moving contact, wherein when the isolating switch is switched on, a copper-tungsten alloy contact finger elastically presses the copper-tungsten alloy sheet of the moving contact, a watchband contact finger is contacted with the moving contact, and in the switching-on process, the copper-tungsten alloy contact finger is always tightly attached to the copper-tungsten alloy sheet of the moving contact; when the brake is switched off, the watchband contact finger is firstly separated from the contact with the moving contact, and the copper-tungsten alloy contact finger is separated from the contact with the copper-tungsten alloy sheet of the moving contact and elastically returns to the initial position.
A high-voltage combined electrical apparatus is characterized in that: including the above-mentioned isolation switch.
The invention has the beneficial effects that:
1. the contact point at the first when the moving contact is switched on and the contact point at the last when the moving contact is switched off are both copper-tungsten alloy contact fingers, an arc extinguishing point and an arc burning point are arranged on the copper-tungsten alloy contact fingers, the moving contact is contacted with the watchband contact fingers after arc extinguishing during switching on, and the moving contact is separated from the watchband contact fingers and then arcs during switching off, so that the isolating switch is ensured to be switched on and off more safely during the operation of reversing the bus, and the ablation and melting of the moving contact and the static contact are avoided;
2. the structure is simple and reliable, the requirements on processing and mounting precision are not very high, and the reliability of the device in long-term operation is facilitated.
Drawings
FIG. 1 is a front sectional view of a preferred embodiment of the apparatus
Fig. 2 is an enlarged schematic view of a stationary contact in fig. 1
FIG. 3 is a schematic view of the position of the movable contact and the stationary contact in FIG. 1 (along the left side view of FIG. 1)
Fig. 4 is an enlarged schematic view of another static contact
In FIGS. 1 to 4: the watch is characterized in that the watch comprises a shell 1, a moving contact 2, a fixed contact 3, a watchband contact finger 4, a copper-tungsten contact finger 5, a copper-tungsten alloy sheet 6, a pulling arc surface 7 and an accommodating groove 8.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the disconnecting switch includes a housing 1, and a moving contact 2 and a static contact 3 disposed in the housing 1, wherein an elastic strap contact finger 4 is disposed on a side of the static contact 3 facing the moving contact 2, and when the disconnecting switch is switched on/off, the first/last contact positions between the moving contact 2 and the static contact 3 are the arcing positions of the moving contact 2 and the static contact 3, respectively. The arc-drawing positions of the moving contacts 2 are respectively provided with copper-tungsten alloy sheets 6.
As shown in fig. 2, the arc-discharge position of the static contact 3 is provided with a copper-tungsten alloy sheet 6, and the copper-tungsten alloy sheet 6 of the static contact 3 elastically extends out of the copper-tungsten alloy contact finger 5 towards the outside of one side of the movable contact 2. In the technical scheme, except that a moving contact 2 and a static contact 3 are respectively provided with a copper-tungsten alloy sheet 6, the front end of a watchband contact finger 4 of the static contact 3 is additionally provided with an elastic copper-tungsten alloy contact finger 5, when an isolating switch starts to be switched on, when the moving contact 2 is close to the static contact 3 within a certain distance, an electric arc is firstly generated between the copper-tungsten alloy sheet 6 of the moving contact 2 and the copper-tungsten alloy sheet 6 of the static contact 3, in the switching-on process, the copper-tungsten alloy contact finger 5 is firstly contacted with the copper-tungsten alloy sheet 6 of the moving contact 2 in advance of the watchband contact finger 4, and an arc extinguishing point is fallen on the copper-tungsten alloy contact finger 5; in the brake-separating process, the watchband contact finger 4 is separated from the movable contact 2 before the copper-tungsten alloy contact finger 5, an electric arc is generated until the copper-tungsten alloy contact finger 5 is separated from the movable contact 2, and the electric arc is extinguished when the movable contact 2 is separated from the fixed contact 3 to a certain distance. The arc ignition point falls on the copper-tungsten alloy contact finger 5.
As shown in fig. 4, the stationary contact 3 has an elastic contact finger 5 made of copper-tungsten alloy at the arcing position, and the contact finger 5 covers the entire arcing position of the stationary contact 3. In the second technical scheme, only the elastic copper-tungsten alloy contact finger 5 is arranged at the arc discharge position of the static contact 3, when the isolating switch starts to be switched on, when the moving contact 2 is close to the static contact 3 within a certain distance, an electric arc is generated between the copper-tungsten alloy sheet 6 of the moving contact 2 and the copper-tungsten alloy contact finger 5 of the static contact 3, and an arc extinguishing point falls on the copper-tungsten alloy contact finger 5; in the process of opening the brake, the watchband contact finger 4 is separated from the movable contact 2 before the copper-tungsten alloy contact finger 5 until the copper-tungsten alloy contact finger 5 is separated from the copper-tungsten alloy sheet 6 of the movable contact 2, an electric arc starts to be generated, and when the movable contact 2 is separated from the static contact 3 to a certain distance, the electric arc is extinguished. The arc ignition point falls on the copper-tungsten alloy contact finger 5.
As shown in fig. 3, in order to ensure that the movable contact 2 rotates smoothly, an axial gap exists between the movable contact 2 and the static contact 3, and the watchband contact finger 4 and the copper-tungsten alloy contact finger 5, which are arranged on one side of the static contact 3 facing the movable contact 2, are both elastic, and can be elastically pressed and retracted when the movable contact 2 rotates to contact with the movable contact, so that the rotation of the movable contact 2 is not interfered.
In the two types of static contact structures shown in fig. 2 and 4, when the isolating switch is switched on, the copper-tungsten alloy contact finger 5 elastically presses against the copper-tungsten alloy sheet 6 of the moving contact 2, the watchband contact finger 4 is then contacted with the moving contact 2, and in the switching-on process, the copper-tungsten alloy contact finger 5 is always attached to the copper-tungsten alloy sheet 6 of the moving contact 2; when the brake is switched off, the watchband contact finger 4 is firstly separated from the contact with the moving contact 2, and the copper-tungsten alloy contact finger 5 is separated from the contact with the copper-tungsten alloy sheet 6 of the moving contact 2 and elastically returns to the initial position. When the switch is closed, the copper-tungsten alloy sheet 6 on the static contact 3 does not need to be in contact with the copper-tungsten alloy sheet 6 on the moving contact 2.
In the two types of static contact structures shown in fig. 2 and 4, one end of the copper-tungsten alloy contact finger 5 is fixed on the static contact 3, and the other end is a free end and extends out of one side of the static contact 3 facing the movable contact 2. In the embodiment shown in fig. 2, the copper-tungsten alloy contact finger 5 is in a shape of a "T" plate, two ends of the "T" head of the copper-tungsten alloy contact finger are respectively locked on the static contact 3 through screws, the "T" tail of the copper-tungsten alloy contact finger is a free end, and when the switch is switched on, the pulling arc surface 7 on the free end of the copper-tungsten alloy contact finger 5 is integrally attached to the copper-tungsten alloy plate 6 of the movable contact 2. And, the static contact 3 and its copper tungsten alloy piece 6 offer the holding tank 8 used for holding the copper tungsten alloy and touching the finger 5 when closing a floodgate on the side towards the moving contact 2. In the embodiment shown in fig. 4, the copper-tungsten alloy contact finger 5 is in a 7-shaped sheet shape, two ends of the 7-shaped head of the copper-tungsten alloy contact finger are respectively locked on the static contact 3 through screws, the T-shaped tail of the copper-tungsten alloy contact finger is a free end, and when the switch is switched on, the pulling arc surface 7 on the free end of the copper-tungsten alloy contact finger 5 is integrally attached to the copper-tungsten alloy sheet 6 of the movable contact 2.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295647.6A CN109411263B (en) | 2018-11-01 | 2018-11-01 | Static contact, rotary blade type isolating switch and high-voltage combined electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295647.6A CN109411263B (en) | 2018-11-01 | 2018-11-01 | Static contact, rotary blade type isolating switch and high-voltage combined electrical apparatus |
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| Publication Number | Publication Date |
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| CN109411263A CN109411263A (en) | 2019-03-01 |
| CN109411263B true CN109411263B (en) | 2020-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811295647.6A Active CN109411263B (en) | 2018-11-01 | 2018-11-01 | Static contact, rotary blade type isolating switch and high-voltage combined electrical apparatus |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022226693A1 (en) * | 2021-04-25 | 2022-11-03 | Abb Schweiz Ag | Earthing switch for switchgear and associated switchgear |
| CN114649161B (en) * | 2021-12-16 | 2024-04-05 | 河南平高电气股份有限公司 | Three-station isolation grounding switch and isolation static contact |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2935202A1 (en) * | 1979-08-31 | 1981-03-26 | Licentia Patent-Verwaltungs-Gmbh, 60596 Frankfurt | CONTACT SYSTEM FOR SWITCHGEAR WITH HIGH SHORT CIRCUIT CURRENTS |
| FR2618251B1 (en) * | 1987-06-25 | 1989-11-17 | Merlin Gerin | ROTARY SWITCH WITH MIGRATION CURVE TRACK OF AN ARC ROOT. |
| DE19837945A1 (en) * | 1998-08-21 | 2000-02-24 | Asea Brown Boveri | Circuit arrangement and method for its manufacture |
| JP2002042614A (en) * | 2000-07-27 | 2002-02-08 | Toshiba Corp | Current switch |
| CN201215780Y (en) * | 2008-06-23 | 2009-04-01 | 南京电气（集团）有限责任公司 | Contact tip component for high-voltage isolation switch |
| CN201845662U (en) * | 2010-05-07 | 2011-05-25 | 大全集团有限公司 | Moving contact of grounding switch |
| US8575508B2 (en) * | 2010-12-16 | 2013-11-05 | Mitsubishi Electric Corporation | Current switch |
| CN104205279B (en) * | 2012-03-23 | 2016-12-28 | 三菱电机株式会社 | Electric current shutter |
| CN103280352B (en) * | 2013-05-17 | 2015-07-22 | 大全集团有限公司 | Switch contact structure |
| CN203367084U (en) * | 2013-07-22 | 2013-12-25 | 青岛特锐德电气股份有限公司 | Disconnector and high voltage switchgear |
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2018
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