CN110556265A - Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching - Google Patents
Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching Download PDFInfo
- Publication number
- CN110556265A CN110556265A CN201910841230.3A CN201910841230A CN110556265A CN 110556265 A CN110556265 A CN 110556265A CN 201910841230 A CN201910841230 A CN 201910841230A CN 110556265 A CN110556265 A CN 110556265A
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- China
- Prior art keywords
- contact
- movable end
- static
- movable
- switching
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0354—Gas-insulated switchgear comprising a vacuum switch
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention discloses a rotary contact structure of a vacuum arc-extinguishing chamber suitable for capacitive load switching, which consists of a movable conducting rod, a static conducting rod, a movable end cup seat, a movable end rotary contact and a static end contact, wherein a spring is arranged in a movable contact groove of the movable end cup seat, and the movable end rotary contact is fixedly connected with the movable end cup seat through the spring; the movable end rotary contact is in sliding connection with the movable end cup seat through the contact and the sliding chute; the lower surface of the movable end rotary contact is in surface contact with the upper surface of the static end contact. And one-way valves are arranged at the two ends of the sliding chute. The movable end rotating contact always rotates in the operation process of the vacuum arc extinguish chamber, static fusion welding on the surface of the contact in the switching-on process can be avoided, and the insulation weakness on the surface of the contact is reduced by the sliding friction between the lower surface of the movable end rotating contact and the upper surface of the static end contact, so that the heavy breakdown probability of the switching of the capacitive load of the vacuum arc extinguish chamber can be effectively reduced, the vacuum arc extinguish chamber can be used for switching the capacitive load, and the vacuum arc extinguish chamber is particularly suitable for the field of reactive power compensation of a power system.
Description
Technical Field
the invention relates to the technical field of contact structures of vacuum arc-extinguishing chambers, in particular to a rotary contact structure of a vacuum arc-extinguishing chamber suitable for capacitive load switching.
Background
reactive power compensation plays an important role in maintaining safe, high-quality and economic operation of a power grid. A large number of capacitive loads and inductive loads exist in the power system, and these loads can generate a large amount of reactive power in the operation process of the power system, and the reactive power can increase system loss, so that the voltage value of a load end is lower than a rated value, and therefore, in order to maintain the voltage level of the power system, ensure the power supply quality, improve the transmission capability, the reactive power compensation of the power system is indispensable. According to the statistics of the operation data of the power grid, every time the active power of 1kW is output, the reactive power of about 1.3kvar needs to be matched at the same time, so that the voltage of the power system can be maintained at a normal level.
The load in the power system fluctuates from time to time, and the demand for reactive power in the power system also changes frequently, so the capacitor bank for reactive compensation is also frequently switched in and out of the power system to maintain the voltage of the power system stable. According to the survey of Bonfanti et al, 60% of capacitor banks for reactive compensation in the power system are switched about 300 times per year on average, and in addition, 30% of capacitor banks are switched about 700 times per year. The reactive power compensation method mainly utilizes power switch equipment to switch a capacitor bank to complete a reactive power compensation task, which shows that the power switch has 1-2 times of frequent switching operation on average every day. In summer peak period of electricity utilization in China, the number of times of reactive compensation of the capacitor bank switched every day is up to 6. The frequently operated working conditions put high demands on the switching capacity and stability of the switched capacitor bank switchgear.
The environmental pollution of SF 6 is caused by the fact that SF 72 has strong adsorption capacity to external free electrons, namely, electrical affinity, SF 6 is dozens of times higher than air, the electrical affinity enables SF 6 gas to have excellent insulating performance, furthermore, high thermal conductivity of SF 6 gas enables SF 6 gas to have excellent arc extinguishing capacity, when the SF 6 gas is applied to reactive compensation of a switching capacitor bank of a power system, the probability of heavy breakdown after an SF 6 arc is very low, the insulating performance is relatively reliable, however, the use of SF 6 gas in the international switching field is strictly limited, various regulations for controlling the use of SF 6 gas are provided in many developed countries currently, for example, the Australian government starts to collect carbon emission tax for SF 6 gas in 2012, the U.S. Pat. No. 7,3672 gas is about No. 7,3672 gas, the greenhouse effect of environmental pollution of SF 6 gas is about No. 7,3672, no toxic environmental pollution is caused by environmental pollution, no environmental pollution.
Compared with the same-voltage class SF 6 circuit breaker product, the vacuum circuit breaker is more suitable for the reactive compensation field in the power system due to the excellent characteristics of the vacuum circuit breaker.
1) Is environment-friendly. The vacuum circuit breaker can not generate greenhouse effect gas and harmful substances in the using process, can not generate the problem of environmental pollution, does not need special treatment after reaching the service life, can not cause explosion and fire accidents when in failure due to the negative pressure equipment, and can effectively ensure the safety of personnel;
2) the vacuum arc-extinguishing chamber is used as a core component of the vacuum circuit breaker, the vacuum arc-extinguishing chamber is free of maintenance during the service life, the opening and closing operation function is small (the operation function of the vacuum circuit breaker under the same voltage level is 20% of that of an SF 6 circuit breaker and below), and the maintenance requirement of an operation mechanism can be reduced;
3) The breaking performance is good. The medium strength is recovered quickly after the arc is cut off, the arcing time is short (namely the short arcing time is usually within a current half-wave), the fault current cut-off capability is still realized when delayed breakdown occurs after the arc is cut off, and the internal components of the arc extinguish chamber cannot be damaged due to repeated breakdown or re-ignition;
4) The environmental impact is small. The electrical performance of the vacuum arc-extinguishing chamber is not influenced by low-temperature environment;
5) Long mechanical and electrical life. The vacuum circuit breaker has a mechanical operation life of ten thousands times and an electrical life of a high number of times of breaking of a fault current (even if the breaking current is a short-circuit current).
When the vacuum circuit breaker is used for switching capacitive loads, the damage of high-frequency inrush current generated in the switching-on process to the contact surface is the most important factor influencing the re-breakdown probability in the switching of the capacitive loads of the vacuum circuit breaker. The whole operation process of the vacuum circuit breaker for switching the capacitive load can be divided into two stages of switching on and switching off: in the closing stage, particularly when the back-to-back capacitor bank is closed, a high-frequency inrush current arc generated in the closing pre-breakdown process can seriously ablate the local surface of the contact and cause fusion welding, and then the contact fusion welding area is broken and millimeter-sized fusion pits and projections are generated in the opening process, and the millimeter-sized fusion pits and projections can become the insulation weak points on the surface of the contact. In the switching-off stage, the two ends of the contact can have recovery voltage 2-2.5 times of the voltage amplitude of the power system after switching-off. Due to the existence of weak insulation points on the surface of the contact of the vacuum arc-extinguishing chamber after inrush current damage, the insulation performance of the vacuum arc-extinguishing chamber is remarkably reduced, and therefore heavy breakdown is easy to occur during the period of bearing high-amplitude recovery voltage after the capacitive current is cut off. Therefore, the protrusions and the molten pits on the surface of the contact after the inrush current is ablated are reduced, so that the insulation characteristic of the vacuum arc-extinguishing chamber in the capacitive breaking process can be obviously improved, and the probability of re-breakdown in the breaking process is reduced.
Disclosure of Invention
the invention aims to provide a rotary contact structure of a vacuum arc-extinguishing chamber suitable for capacitive load switching, wherein a movable end rotary contact of the vacuum arc-extinguishing chamber always rotates in the operation process, the static fusion welding of the lower surface of the movable end rotary contact and the upper surface of a static end contact in the switching-on process can be avoided, and the insulation weakness of the contact surface is reduced by the sliding friction between the lower surface of the movable end rotary contact and the upper surface of the static end contact, so that the re-striking probability of the capacitive load switching of the vacuum arc-extinguishing chamber can be effectively reduced, and the rotary contact structure can be used for switching capacitive loads.
The purpose of the invention is realized as follows:
The utility model provides a vacuum interrupter's rotatory contact structure suitable for capacitive load switching, the characteristic is: the movable contact cup is characterized by comprising a movable conducting rod, a static conducting rod, a movable end cup seat, a movable end rotary contact and a static end contact, wherein the static end contact is fixedly connected with the static conducting rod; the side wall in the moving contact groove is provided with a sliding groove, and the top end of the outer side wall of the moving-end rotating contact is uniformly provided with a plurality of contacts capable of moving in the sliding groove, so that the moving-end rotating contact is in sliding connection with the moving-end cup base through the contacts and the sliding groove; the lower surface of the movable end rotary contact is in surface contact with the upper surface of the static end contact.
and one-way valves are arranged at the two ends of the sliding groove, so that the sliding directions of the contacts in the sliding groove can be kept consistent.
The working principle is as follows:
1. In the switching-on process, after the movable end rotary contact is contacted with the static end contact, the movable end rotary contact can continuously rotate around a central shaft of the vacuum arc-extinguishing chamber, and the lower surface of the movable end rotary contact and the upper surface of the static end contact can generate sliding friction until the movable end rotary contact and the static end contact are completely closed; in the process of sliding friction between the lower surface of the rotating contact at the movable end and the upper surface of the contact at the static end, macro protrusions and molten pits formed by locally ablating the lower surface of the rotating contact at the movable end and the upper surface of the contact at the static end by switching inrush current of a vacuum arc-extinguishing chamber switched capacitive load are gradually eliminated due to the sliding friction, the insulation weak points of the lower surface of the rotating contact at the movable end and the upper surface of the contact at the static end are also continuously reduced, and therefore the insulation characteristics of the lower surface of the rotating contact at the movable end and the upper surface of the contact at the static end are remarkably improved;
2. in the process of opening the brake, the pressure of the spring and the limiting effect of the sliding groove on the contact on the movable end rotary contact are received, the movable end rotary contact can continue to rotate around the central shaft, the check valves are arranged at the two ends of the sliding groove, the rotating direction of the movable end rotary contact in the process of opening the brake is consistent with that in the process of closing the brake, therefore, in the process of opening and closing the arc, the rotation of the movable end rotary contact can enable the arc energy to be more uniformly distributed on the surface of the contact, a more obvious aging effect is generated, the insulation weakness of the lower surface of the movable end rotary contact and the upper surface of the static end contact is further eliminated, and the insulation characteristic of the arc extinguish chamber can be effectively improved.
The movable end rotating contact of the vacuum arc extinguish chamber can rotate around the central shaft simultaneously in the switching-on and switching-off operation processes.
The rotary contact structure suitable for capacitive load switching, the shell, the shielding cover and the corrugated pipe guide form a vacuum arc extinguish chamber.
Compared with the prior art, the invention has the following advantages:
1) In the switching-on process, sliding friction occurs on the lower surface of the movable end rotary contact and the upper surface of the static end contact, macroscopic protrusions and molten pits formed by local ablation of switching inrush current of a capacitive load of the vacuum arc-extinguishing chamber on the lower surface of the movable end rotary contact and the upper surface of the static end contact are gradually eliminated due to the sliding friction, the insulation weak points of the lower surface of the movable end rotary contact and the upper surface of the static end contact are also continuously reduced, and therefore the insulation characteristics of the lower surface of the movable end rotary contact and the upper surface of the static end contact are remarkably improved;
2) In the process of opening and breaking arcing of the opening brake, the rotation of the movable end rotary contact can enable the arc energy to be more uniformly distributed on the lower surface of the movable end rotary contact and the upper surface of the static end contact, so that a more obvious aging effect is generated, the insulation weakness of the lower surface of the movable end rotary contact and the upper surface of the static end contact is further eliminated, and the insulation characteristic of the arc extinguish chamber can be effectively improved;
3) The contact structure can be assembled in various vacuum arc-extinguishing chambers, can effectively reduce the heavy breakdown probability of the switching of capacitive loads of the vacuum arc-extinguishing chambers, can be used for switching the capacitive loads, such as back-to-back capacitor banks, single capacitor banks and the like, and is particularly suitable for the field of reactive power compensation of power systems.
Drawings
FIGS. 1 and 2 are schematic structural views of the present invention;
FIG. 3 is a schematic diagram illustrating the contact time between the rotating contact at the moving end and the contact at the stationary end when the capacitive load is closed according to the present invention;
FIG. 4 is a schematic diagram of the spring compression process with capacitive loading according to the present invention;
FIG. 5 is a schematic view of the present invention at a fully closed time;
FIG. 6 is a schematic diagram of the opening process of the present invention;
FIG. 7 is a schematic view of the movable conducting rod and the movable end cup holder;
Reference numerals: 1: moving conductive rod, 2: static conductive rod, 3: moving end cup seat, 4: a spring; 5: moving contact groove, 6: moving end rotary contact, 7: stationary end contact, 8: chute, 9: contact, 10: a one-way valve.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings.
As shown in fig. 1 and 2, a rotary contact structure of a vacuum interrupter suitable for capacitive load switching is composed of a movable conducting rod 1, a static conducting rod 2, a movable end cup holder 3, a movable end rotary contact 6 and a static end contact 7, wherein the static end contact 7 is fixedly connected with the static conducting rod 2, the movable end cup holder 3 is fixedly connected with the movable conducting rod 1, a movable contact groove 5 with a downward opening is arranged in the movable end cup holder 3, a vertically arranged spring 4 is arranged in the movable contact groove 5, the top end of the spring 4 is fixed at the top end in the movable contact groove 5, and the bottom end of the spring 4 is fixed at the top end of the movable end rotary contact 6, so that the movable end rotary contact 6 is fixedly connected with the movable end cup holder 3 through the spring 4; a sliding groove 8 is arranged on the side wall in the moving contact groove 5, and a plurality of contacts 9 capable of moving in the sliding groove 8 are uniformly arranged at the top end of the outer side wall of the moving end rotating contact 6, so that the moving end rotating contact 6 is in sliding connection with the moving end cup base 3 through the contacts 9 and the sliding groove 8; the two ends of the sliding chute 8 are provided with one-way valves 10, so that the sliding directions of the contacts 9 in the sliding chute 8 are kept consistent; the lower surface of the moving-end rotary contact 6 is in surface contact with the upper surface of the stationary-end contact 7.
As shown in fig. 3, during the closing process, under the pressure of the spring 4, the moving-end rotating contact 6 moves downward along with the moving-end cup 3 until the lower surface of the moving-end rotating contact 6 contacts with the upper surface of the stationary-end contact 7. As shown in fig. 4, as the conducting rod 1 continues to move downward, the movable end rotary contact 6 continuously rotates around the central axis after contacting with the stationary end contact 7, and the lower surface of the movable end rotary contact 6 and the upper surface of the stationary end contact 7 generate sliding friction until the contacts are completely closed, so as to reach the state shown in fig. 5. In the process that sliding friction occurs between the lower surface of the movable end rotary contact 6 and the upper surface of the static end contact 7, macroscopic protrusions and molten pits formed on the surface of the vacuum arc-extinguishing chamber switching capacitive load switching inrush current local ablation contact are gradually eliminated due to the sliding friction, the insulation weakness of the surface of the contact is also reduced, and therefore the insulation property of the surface of the contact is remarkably improved.
as shown in fig. 6, in the switching-off process, the movable end rotary contact 6 can continue to rotate around the central shaft due to the limiting effect of the sliding groove 8 on the contact point on the movable end rotary contact 6 under the pressure of the spring 4, and the rotation direction can be ensured to be consistent with the switching-on process by arranging the one-way valve in the sliding groove 8. Therefore, in the process of switching on and off arcing, the rotation of the movable end rotating contact 6 can enable the arc energy to be more uniformly distributed on the surface of the contact, a more obvious aging effect is generated, the insulation weakness of the surface of the contact is further eliminated, and the insulation characteristic of the arc extinguish chamber can be effectively improved.
The moving contact of the vacuum arc extinguish chamber can continuously rotate in the switching-on and switching-off operations in the operation process, and the rotating direction is kept consistent.
The rotary contact structure suitable for capacitive load switching, the shell, the shielding cover and the corrugated pipe guide form a vacuum arc extinguish chamber.
Claims (2)
1. the utility model provides a vacuum interrupter's rotating contact structure suitable for capacitive load switching which characterized in that: the movable contact cup is characterized by comprising a movable conducting rod, a static conducting rod, a movable end cup seat, a movable end rotary contact and a static end contact, wherein the static end contact is fixedly connected with the static conducting rod; the side wall in the moving contact groove is provided with a sliding groove, and the top end of the outer side wall of the moving-end rotating contact is uniformly provided with a plurality of contacts capable of moving in the sliding groove, so that the moving-end rotating contact is in sliding connection with the moving-end cup base through the contacts and the sliding groove; the lower surface of the movable end rotary contact is in surface contact with the upper surface of the static end contact.
2. the rotary contact structure of the vacuum interrupter suitable for capacitive load switching of claim 1, wherein: and one-way valves are arranged at the two ends of the sliding groove, so that the sliding directions of the contacts in the sliding groove can be kept consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910841230.3A CN110556265A (en) | 2019-09-06 | 2019-09-06 | Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910841230.3A CN110556265A (en) | 2019-09-06 | 2019-09-06 | Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110556265A true CN110556265A (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910841230.3A Pending CN110556265A (en) | 2019-09-06 | 2019-09-06 | Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching |
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| CN (1) | CN110556265A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112164621A (en) * | 2020-09-29 | 2021-01-01 | 山东晨鸿电气有限公司 | Composite electric contact |
| CN113745044A (en) * | 2021-08-06 | 2021-12-03 | 四川大学 | Vacuum arc-extinguishing chamber contact |
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| CN109313994A (en) * | 2016-05-13 | 2019-02-05 | 西门子股份公司 | The coupling for electric switch equipment with inertia mass element |
| CN109616373A (en) * | 2018-12-12 | 2019-04-12 | 西安交通大学 | A kind of vacuum interrupter composite contact, vacuum interrupter and vacuum circuit breaker |
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2019
- 2019-09-06 CN CN201910841230.3A patent/CN110556265A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104919557A (en) * | 2013-01-14 | 2015-09-16 | 阿尔斯通技术有限公司 | Breaker having a rotating-arc contact |
| CN204130373U (en) * | 2014-10-11 | 2015-01-28 | 永康市威力园林机械有限公司 | A kind of two-way emergency button device for rotary cultivator |
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| CN107331571A (en) * | 2017-07-20 | 2017-11-07 | 中国电力科学研究院 | A kind of vacuum arc-extinguishing chamber contact and its control method for switched capacitor group |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112164621A (en) * | 2020-09-29 | 2021-01-01 | 山东晨鸿电气有限公司 | Composite electric contact |
| CN113745044A (en) * | 2021-08-06 | 2021-12-03 | 四川大学 | Vacuum arc-extinguishing chamber contact |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191210 |
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| RJ01 | Rejection of invention patent application after publication |