CN110706967A - Quick earthing switch with arc quenching device - Google Patents
Quick earthing switch with arc quenching device Download PDFInfo
- Publication number
- CN110706967A CN110706967A CN201910938078.0A CN201910938078A CN110706967A CN 110706967 A CN110706967 A CN 110706967A CN 201910938078 A CN201910938078 A CN 201910938078A CN 110706967 A CN110706967 A CN 110706967A
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- Prior art keywords
- contact
- arc quenching
- quenching device
- grounding switch
- piston plate
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- 238000010791 quenching Methods 0.000 title claims abstract description 34
- 230000000171 quenching effect Effects 0.000 title claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 claims description 59
- 239000004020 conductor Substances 0.000 claims description 8
- 239000000872 buffer Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/22—Selection of fluids for arc-extinguishing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Circuit Breakers (AREA)
Abstract
A quick grounding switch with an arc quenching device belongs to the technical field of quick grounding switches. The quick grounding switch with the arc quenching device comprises a fixed contact, a moving contact, an operating mechanism and the arc quenching device arranged in a sealing cylinder, wherein the arc quenching device comprises a pressure cylinder, a piston plate is arranged in the pressure cylinder, an air inlet chamber is formed by the piston plate and one side, close to the fixed contact, of the pressure cylinder, the air inlet chamber is communicated with the interior of the moving contact through a plurality of first air holes, the air inlet chamber is communicated with the exterior of the fixed contact through a plurality of air guide pipes, one end, close to the fixed contact, of each air guide pipe is smoothly and reliably connected with the outer wall of the moving contact, one end of the moving contact is matched with the fixed contact, the other end of the moving contact is connected. The quick grounding switch with the arc quenching device optimizes the structure of the quick grounding switch, enhances the arc quenching capability, improves the capability of the quick grounding switch for switching on and off the induced current, and further improves the working reliability of the quick grounding switch.
Description
Technical Field
The invention relates to the technical field of quick grounding switches, in particular to a quick grounding switch with an arc quenching device.
Background
The ultra-B type quick grounding switch is a quick grounding switch acting on a line which is extremely long in coupling length with an adjacent live line or extremely strong in coupling length, and is applied to an extra-high voltage transmission line needing automatic reclosing due to the fact that the ultra-B type quick grounding switch has a better capacity of extinguishing a latent supply arc (compared with a common quick grounding switch). The quick grounding switch arranged on the GIL pipeline is operated by the spring mechanism, and the induced current in the circuit can be quickly led into the ground, so that the safety of circuit equipment and operation and maintenance personnel is protected. Compared with an ultrahigh voltage transmission line, the ultrahigh voltage transmission line has high voltage level, large transmission capacity, high tower height of a line pole and long insulator string, and a grounding switch suitable for an ultrahigh voltage GIL pipeline does not exist in the prior art to ensure the successful on-off of a secondary arc current.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a quick grounding switch with an arc quenching device, which optimizes the structure of the quick grounding switch, enhances the arc quenching capability, improves the capability of the quick grounding switch for breaking induced current, and further improves the working reliability of the quick grounding switch.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fast grounding switch with an arc quenching device comprises a static contact, a moving contact, an operating mechanism and the arc quenching device arranged in a sealing cylinder;
the arc quenching device comprises a pressure cylinder, a piston plate is arranged in the pressure cylinder, an air inlet chamber is formed on one side, close to the static contact, of the piston plate and the pressure cylinder, the air inlet chamber is communicated with the interior of the movable contact through a plurality of first air holes, the air inlet chamber is communicated with the exterior of the static contact through a plurality of air guide pipes, and one end, close to the static contact, of each air guide pipe is smoothly and reliably connected with the outer wall of the movable contact;
one end of the moving contact is matched with the static contact, the other end of the moving contact is connected with the piston plate, one side of the piston plate, which is far away from the moving contact, is connected with the operating mechanism, and the operating mechanism drives the moving contact to reciprocate to connect or disconnect the moving contact and the static contact;
the fixed contact is a hollow fixed contact, and the central conductor is provided with a through hole corresponding to the hollow fixed contact and used for communicating the fixed contact with the GIL pipeline.
The air cylinder is a cylindrical cavity, the top of the air cylinder is connected with the GIL pipeline, and the lower part of the air cylinder is provided with an opening.
The piston plate is smoothly and reliably connected with the inner wall of the air cylinder.
The piston plate is made of a conductive material, preferably an aluminum sheet material.
The moving contact is located the axis position of pressure cylinder, and the moving contact moves along pressure cylinder axis direction, and a plurality of first pore space is located one side that the moving contact is close to the piston board.
The moving contact overcoat is equipped with the moving end shield, the moving end shield is close to one side of moving contact and is provided with the circumferential groove, the circumferential groove is installed with the guide ring.
The static contact is provided with a static end shielding cover.
A plurality of second air holes are formed between the air inlet chamber and the GIL pipeline, and one end, close to the air inlet chamber, of the air guide pipe is connected with the second air holes.
The invention has the beneficial effects that:
1) the invention is suitable for the extra-high voltage GIL pipeline, can ensure the successful on-off of the secondary arc current, enhances the arc quenching capability, and improves the capability of the quick grounding switch for breaking the induced current and the working reliability thereof;
2) when the moving contact and the static contact move to be just separated, because an airflow channel formed between the static contact and the moving contact is extremely narrow, the flow velocity of insulating gas in the channel is high, at the moment, because the pressure intensity of the air inlet chamber is lower, the air guide pipe guides the gas near the opening of the air guide pipe into the air inlet chamber, the flow velocity of the gas between the static contact and the moving contact is accelerated, the effect of quickly extinguishing an arc is achieved, meanwhile, the gas at one end of the moving contact is also guided into the air inlet chamber through the first air hole, the flow velocity of the gas between the static contact and the moving contact is further accelerated;
3) when the piston plate moves downwards, the piston plate moves to the position of the opening of the air pressing cylinder, the air inlet chamber is opened, and air in the air inlet chamber rapidly flows into the sealing cylinder to play a role in balancing pressure intensity;
4) the sealing cylinder can effectively prevent the leakage of insulating gas, ensure that the insulating gas in the GIL pipeline is not polluted and realize the effect of quickly extinguishing the arc;
5) the static contact is a hollow static contact, namely when the quick grounding switch is in a switching-off state, an electric arc is generated between the movable contact and the static contact, the end part of the static contact has low pressure and high temperature, and insulating gas quickly flows to the end part of the static contact from the GIL pipeline through the hollow part of the static contact, so that the gas flow rate is accelerated, and the aim of quickly extinguishing the arc is fulfilled;
6) the technical scheme of the invention can be obtained by modifying the ultrasonic B-type quick grounding switch in the prior art, and compared with the quick grounding switch in the prior art, the invention adds the arc quenching device, thereby saving the cost.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a front view of a fast grounding switch with an arc quenching device according to an embodiment of the present invention;
fig. 2 is a structural side view of a quick grounding switch with an arc quenching device according to an embodiment of the present invention;
fig. 3 is a schematic view of a movable contact and a fixed contact provided in the embodiment of the present invention when they are connected;
fig. 4 is a schematic view of a moving contact and a stationary contact disconnected according to an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1. the air-conditioning device comprises a static contact, 2, a static end shield cover, 3, an air guide pipe, 4, a central conductor, 5, a moving contact, 6, a moving end shield cover, 7, a second air hole, 8, a piston plate, 9, a first air hole, 10, an air inlet chamber, 11, a connecting rod, 12, an operating mechanism, 13 and a sealing cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," and may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to solve the problems in the prior art, as shown in fig. 1 to 4, an embodiment of the present invention provides a fast grounding switch with an arc quenching device, which optimizes a structure of the fast grounding switch, enhances an arc quenching capability, improves an induced current breaking capability of the fast grounding switch, and further improves a working reliability of the fast grounding switch.
As shown in fig. 1-4, the quick grounding switch with the arc quenching device comprises a static contact 1, a moving contact 5, an operating mechanism 12 and the arc quenching device arranged in a sealed cylinder 13, and the arc quenching device is arranged to be an ultra-B type quick grounding switch suitable for an extra-high voltage GIL pipeline, so that the switching-on/off capability is stronger, and the successful switching-on/off of a secondary current can be ensured. The arc quenching device comprises a pressure cylinder, the pressure cylinder is a cylindrical cavity, the top of the pressure cylinder is connected with a GIL pipeline, an opening is formed in the lower portion of the pressure cylinder, one side, located at the lower portion of the piston plate 8, of the pressure cylinder is provided with an unsealed opening, so that the connecting rod 11 of the operating mechanism 12 is connected with the other end of the movable contact 5, insulating gas is filled in the sealing cylinder 13 to ensure the stability of the insulating gas in the pressure cylinder, in addition, when the piston plate 8 moves downwards, the air inlet chamber 10 is opened when the piston plate 8 moves to the position of the opening of the pressure cylinder, and the gas in the air inlet chamber 10 rapidly flows into the sealing cylinder 13 to. Be equipped with piston plate 8 in the pressure cylinder, piston plate 8 makes piston plate 8's periphery and pressure cylinder inner wall contact guarantee the sealed of pressure chamber with the smooth reliable connection of pressure cylinder inner wall to make the friction between piston plate 8 and the pressure cylinder inner wall very little, the 8 reciprocating motion raise the efficiency of piston plate of being convenient for, piston plate 8 adopts electrically conductive material, preferably aluminum sheet material. An air inlet chamber 10 is formed by the piston plate 8 and one side of the air cylinder, which is close to the static contact 1, the air inlet chamber 10 is communicated with the interior of the movable contact 5 through a plurality of first air holes 9, the movable contact 5 is positioned at the axis position of the air cylinder, the movable contact 5 moves along the axis direction of the air cylinder, the plurality of first air holes 9 are positioned at one side of the movable contact 5, which is close to the piston plate 8, a movable end shielding cover 6 is sleeved outside the movable contact 5, one side of the movable end shielding cover 6, which is close to the movable contact 5, is provided with a circumferential groove, a guide ring is installed in the circumferential groove for ensuring the reciprocating motion stability of the movable contact 5, one end of the movable contact 5 is matched with the static contact 1, the other end of the movable contact 5 is connected with the piston plate 8, one side of the piston plate 8, which is far away from the movable contact 5, is connected, one end of the air duct 3 close to the static contact 1 is smoothly and reliably connected with the outer wall of the moving contact 5, a plurality of second air holes 7 are arranged between the air inlet chamber 10 and the GIL pipeline, and one end of the air duct 3 close to the air inlet chamber 10 is connected with the second air holes 7. The static contact 1 is provided with a static end shield cover 2 around, the static end shield cover 2 can balance voltage, inhibit the field intensity distortion of the part with larger curvature of the static contact 1 from being serious, and metal steam, electrons and ions generated in the arcing process can be diffused in a short time and adsorbed on the static end shield cover 2 to be condensed, so that the electric arc is forced to be extinguished when the current crosses zero, and the insulation is recovered. The static contact 1 is a hollow static contact, that is, a hollow structure is arranged in the axis direction of the existing static contact 1, the central conductor 4 is provided with a through hole corresponding to the hollow structure of the hollow static contact, so that the static contact 1 is communicated with the GIL pipe, when the fast grounding switch is in a switching-off state, an electric arc is generated between the moving contact 5 and the static contact 1, at the moment, the end part of the static contact 1 has low pressure and high temperature, insulating gas quickly flows to the end part of the static contact 1 from the GIL pipe through the hollow part of the static contact 1, the gas flow rate is accelerated, and the.
In this embodiment, the operating mechanism may adopt an operating mechanism 12 in a fast grounding switch in the prior art, and may include a connecting rod 11 and a mechanism connecting plate, etc., which are connected by a pivot, where the connecting rod 11 drives the piston plate 8 and the moving contact 5 to move, thereby changing the pressure of the air inlet chamber 10, and thus realizing the function of increasing the air flow rate, when the operating mechanism 12 drives the moving contact 5 to move downward, before the primary zero crossing of the secondary power current, one end of the air duct 3 close to the stationary contact 1 is separated from the outer wall of the moving contact 5, so as to ensure the arc extinction when the primary zero crossing occurs, and when in actual use, the relative position of the air duct 3 and the stationary contact 1 may be determined according to the peak value. Sealing cylinder 13 and GIL pipe connection, moving contact 5 is the hollow moving contact 5 among the prior art, the guide ring plays the effect of uide bushing, be used for guaranteeing moving contact 5 reciprocating motion's stability, moving contact 5 is equipped with 6 first gas pockets 9 and guarantees the intercommunication of air inlet chamber 10 and moving contact 5 inside, lie in the first gas pocket 9 of the top in 6 first gas pockets 9 and can not be higher than the guide ring in moving end shield 6 when moving contact 5 merges with static contact 1, guarantee switch operation's stability, set up 4 second gas pockets 7 between air inlet chamber 10 and the GIL pipeline, the diameter of first gas pocket 9 and second gas pocket 7 is adjusted according to the difference of breaking voltage grade, be used for reaching the effect of breaking. The static contact 1 is surrounded by static end shield 2, and static end shield 2 is installed on the central conductor 4 of GIL pipeline to and the moving end shield 6 of moving contact 5 peripheral installation are used for even electric field, and static end shield 2 and moving end shield 6 are the metal construction that electric conductive property is good, and static contact 1 and moving contact 5 matched part are high temperature resistant tungsten-copper alloy, and air duct 3 adopts high temperature resistant pottery.
The working principle of the quick grounding switch with the arc quenching device is as follows:
when the GIL pipeline fails, as shown in fig. 3, the static contact 1 and the moving contact 5 are in a connected state;
after the fault of the GIL pipeline is removed, as shown in fig. 4, the operating mechanism 12 is opened, the operating mechanism 12 operates to make the connecting rod 11 of the operating mechanism pull the moving contact 5 to move downwards together with the piston plate 8, the pressure of the gas in the gas inlet chamber 10 and the moving contact 5 is reduced, and the gas flows into the gas inlet chamber 10 from the second gas hole 7 through the gas guide pipe 3; when the moving contact 5 and the static contact 1 move to be just separated, because an airflow channel formed between the static contact 1 and the moving contact 5 is extremely narrow, the flow velocity of insulating gas in the channel formed between the static contact 1 and the moving contact 5 is high, because the pressure intensity of the air inlet chamber 10 is low, the air guide tube 3 guides the gas near the opening of the air guide tube 3 into the air inlet chamber 10, the flow velocity of the gas between the static contact 1 and the moving contact 5 is accelerated, the effect of quickly extinguishing arc is achieved, meanwhile, the gas at one end of the moving contact 5 is also guided into the air inlet chamber 10 through the first air hole 9, the flow velocity of the gas between the static contact 1 and the moving contact 5 is further accelerated, the quick arc extinguishing effect is enhanced, meanwhile, the static contact 1 is a hollow static contact, because the pressure intensity of the end part of the static contact 1 is low and the temperature is high, in this embodiment, when the distance between the fixed contact 1 and the movable contact 5 is 177mm, the piston plate 8 moves downward to the position of the opening of the air cylinder, and the gas in the air inlet chamber 10 rapidly flows into the sealing cylinder 13, thereby achieving the effect of pressure equalization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A fast grounding switch with an arc quenching device is characterized by comprising a static contact, a moving contact, an operating mechanism and the arc quenching device arranged in a sealing cylinder;
the arc quenching device comprises a pressure cylinder, a piston plate is arranged in the pressure cylinder, an air inlet chamber is formed on one side, close to the static contact, of the piston plate and the pressure cylinder, the air inlet chamber is communicated with the interior of the movable contact through a plurality of first air holes, the air inlet chamber is communicated with the exterior of the static contact through a plurality of air guide pipes, and one end, close to the static contact, of each air guide pipe is smoothly and reliably connected with the outer wall of the movable contact;
one end of the moving contact is matched with the static contact, the other end of the moving contact is connected with the piston plate, one side of the piston plate, which is far away from the moving contact, is connected with the operating mechanism, and the operating mechanism drives the moving contact to reciprocate to connect or disconnect the moving contact and the static contact;
the fixed contact is a hollow fixed contact, and the central conductor is provided with a through hole corresponding to the hollow fixed contact and used for communicating the fixed contact with the GIL pipeline.
2. The quick grounding switch with arc quenching device as claimed in claim 1, wherein said air cylinder is a cylindrical cavity, the top of which is connected to the GIL pipe, and the lower part of which is provided with an opening.
3. The quick grounding switch with arc quenching device of claim 1 wherein said piston plate is smoothly and securely attached to the inner wall of the puffer cylinder.
4. The quick grounding switch with arc quenching device as claimed in claim 1, wherein said piston plate is made of conductive material.
5. The switch of claim 1, wherein the movable contact is located on an axis of the puffer cylinder, the movable contact moves along the axis of the puffer cylinder, and a plurality of the first air holes are located on a side of the movable contact close to the piston plate.
6. The fast grounding switch with arc quenching device as claimed in claim 1, wherein the moving contact is sheathed with a moving end shield, a circumferential groove is formed on one side of the moving end shield close to the moving contact, and a guide ring is installed in the circumferential groove.
7. The fast grounding switch with arc quenching device as claimed in claim 1, wherein said stationary contact is provided with a stationary end shield.
8. The quick grounding switch with an arc quenching device as claimed in claim 1, wherein a plurality of second air holes are provided between the air inlet chamber and the GIL pipeline, and one end of the air duct close to the air inlet chamber is connected with the second air holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938078.0A CN110706967A (en) | 2019-09-30 | 2019-09-30 | Quick earthing switch with arc quenching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938078.0A CN110706967A (en) | 2019-09-30 | 2019-09-30 | Quick earthing switch with arc quenching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110706967A true CN110706967A (en) | 2020-01-17 |
Family
ID=69197909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910938078.0A Pending CN110706967A (en) | 2019-09-30 | 2019-09-30 | Quick earthing switch with arc quenching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110706967A (en) |
-
2019
- 2019-09-30 CN CN201910938078.0A patent/CN110706967A/en active Pending
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