CN113178353A - Control method and device for series double-break vacuum circuit breaker for capacitor - Google Patents
Control method and device for series double-break vacuum circuit breaker for capacitor Download PDFInfo
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- CN113178353A CN113178353A CN202110437787.8A CN202110437787A CN113178353A CN 113178353 A CN113178353 A CN 113178353A CN 202110437787 A CN202110437787 A CN 202110437787A CN 113178353 A CN113178353 A CN 113178353A
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- 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
- H01H33/666—Operating arrangements
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- 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
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Abstract
The application provides a control method and a device of a series double-fracture vacuum circuit breaker for a capacitor, wherein the method comprises the steps of using a control switch, using an asynchronous opening and closing method to control two vacuum arc-extinguishing chambers, closing the control switch, controlling the vacuum arc-extinguishing chamber VI1 to act first, and enabling a contact of the vacuum arc-extinguishing chamber VI2 to bear ablation of high-frequency inrush current; and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current. The application provides a capacitor can carry out asynchronous operation with two fractures of two fracture vacuum circuit breakers of series connection, vacuum circuit breaker VI 1's explosion chamber has very strong ability of breaking short-circuit current, vacuum circuit breaker's VI2 explosion chamber has very strong anti high frequency rush current ablation's ability, based on the above-mentioned control strategy who is used for the two fracture vacuum circuit breakers of series connection and the nonsynchronous branch that closes of switched capacitor group, the anti ablation ability of this application improves greatly, the whole dielectric strength who opens and breaks two fractures of series connection also can improve, the ability of opening and breaking of circuit breaker has been guaranteed.
Description
Technical Field
The application relates to the technical field of vacuum circuit breakers, in particular to a control method and device of a series double-break vacuum circuit breaker for a capacitor.
Background
In China, reactive compensation and voltage control of a system are generally realized by a medium-voltage distribution network and a low-voltage distribution network in a mode of parallel capacitor banks. In recent years, with the rapid development of economy in China, the power demand and the complexity of a power grid structure are continuously increased, so that the system load is changed frequently. At this time, the power distribution network is required to change the capacitance input amount of the parallel compensation capacitor in time according to the load change of the power grid, so that the switching operation of the parallel capacitor of the power distribution network is frequent day by day, and sometimes, multiple switching operations are required to maintain the stability of the system voltage every day.
The switching-on surge current and the switching-off overvoltage are two main harm factors influencing the reliable operation of a capacitor bank in the random switching process, and accidents such as capacitor damage, breaker explosion and the like often occur when a vacuum breaker switches a parallel capacitor.
In order to solve the problems, researchers develop a more reliable switching technology, namely a phase selection control closing (opening) technology, the method can greatly reduce the inrush current when the capacitor bank is put in and the restriking probability when the capacitor bank is cut off, and the method is more economical and effective than measures for restraining the inrush current and the overvoltage such as a closing resistor, a series reactor and the like. The section-androsteron and the like research the control strategy of the phase-controlled circuit breaker and the factors influencing the control effect, develop a permanent magnet operating mechanism phase-controlled vacuum circuit breaker applied to the medium-voltage field on the basis, and perform simulation tests. Kohyama et al propose a calculation method for calculating the maximum and minimum values of the switching-on overvoltage of the ultrahigh voltage phase-controlled circuit breaker based on the reduction rate of the medium strength and the mechanical dispersion of the switching-on of the circuit breaker, and the theoretical calculation value is basically consistent with the laboratory test. Brunke et al propose 3 control strategies for suppressing transformer switching-on inrush current, and respectively verify the effectiveness of the 3 methods through simulation and laboratory tests.
Although researchers do much research on the phase control technology, the research on the asynchronous switching technology of the multi-fracture series vacuum circuit breaker is very little, namely, in the common double-fracture vacuum circuit breaker in the industry at present, two vacuum arc-extinguishing chambers are synchronously switched on and switched off, and the two series vacuum arc-extinguishing chambers are subjected to high-frequency inrush current pre-breakdown arc ablation, so that contacts of the two vacuum arc-extinguishing chambers are damaged, and the insulation strength of the series double fractures is greatly reduced under the condition.
Disclosure of Invention
The application provides a capacitor is with two fracture vacuum circuit breaker control method and device in series connection, though the researcher has done a lot of research to controlling the technique mutually, but to the asynchronous combination and separation technical research of the vacuum circuit breaker of multi-fracture series connection very few, the common two fracture vacuum circuit breaker in present trade, two vacuum interrupter close in step, divide the operation, two series connection vacuum interrupter all stand high frequency inrush current and puncture electric arc ablation in advance, consequently, two vacuum interrupter's contact all can be destroyed, the problem that the dielectric strength of two fractures of series connection reduces by a wide margin under this condition.
On the one hand, the application provides a control method of a series double-break vacuum circuit breaker for a capacitor, which comprises the following steps:
the control switch is used for controlling two vacuum arc-extinguishing chambers by applying an asynchronous opening and closing method, and the using method comprises the following steps:
closing the control switch, controlling the vacuum arc extinguish chamber VI1 to act first, and enabling the contact of the vacuum arc extinguish chamber VI2 to bear the ablation of high-frequency inrush current;
and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current.
Optionally, the action timing characteristic of the vacuum circuit breaker control method includes:
closing the control switch to carry out closing operation, wherein a time interval delta Tc exists between closing time of the two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched on at the time of T1, and the vacuum arc extinguish chamber VI2 is switched on at the time of T2;
the vacuum arc-extinguishing chamber VI1 realizes no current switching, high-frequency inrush current pre-breakdown electric arcs are only generated on the vacuum arc-extinguishing chamber VI2, and only the contact surface in the vacuum arc-extinguishing chamber VI2 is damaged;
the time interval Δ Tc is longer than the closing time of the vacuum interrupter VI1, and the contact surface of the vacuum interrupter VI1 is not ablated by the inrush arc.
Optionally, the action timing characteristic of the vacuum circuit breaker control method further includes:
opening a control switch To perform switching-off operation, wherein a time interval delta To also exists between the switching-on time of two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched off at the time of T3, and the vacuum arc extinguish chamber VI2 is switched off at the time of T4;
the time interval delta To is less than the arcing time of the vacuum arc-extinguishing chamber VI 1;
the contact of the vacuum arc-extinguishing chamber VI2 is aged by arc current of hundreds of amperes generated at the moment of switching on and off, the damage of high-frequency inrush arc ablation on the surface of the contact is eliminated, and the fracture insulation strength of the contact is improved.
On the other hand, this application provides a condenser is with two fracture vacuum circuit breakers of series connection, its characterized in that includes:
two vacuum interrupters, vacuum interrupter VI1, are configured to open and close short circuit fault current, and vacuum interrupter VI2 is configured to close high frequency inrush current.
Optionally, the material of the contact in the vacuum arc extinguish chamber VI1 is a CuCr alloy, and the material of the contact in the vacuum arc extinguish chamber VI2 is a CuW alloy.
The invention relates to a control strategy for switching a capacitor bank of a series double-break vacuum circuit breaker, which is characterized in that:
by adopting an asynchronous switching technology and time sequence control, the switching-on (switching-off) time of the two series fractures is controlled, so that only the contact in the vacuum arc extinguish chamber VI2 is ablated by high-frequency inrush current pre-breakdown electric arcs, and the contact in the vacuum arc extinguish chamber VI1 is responsible for switching-on and switching-off short-circuit fault current. When the closing operation is carried out, an interval delta Tc exists between the closing time of two series-connected vacuum fractures, and after the vacuum arc-extinguishing chamber VI1 which is responsible for the short-circuit current breaking is closed at the time T1, the vacuum arc-extinguishing chamber VI2 which is responsible for closing the high-frequency inrush current is closed at the time T2. In this way, the vacuum interrupter VI1 is switched on and off without current, and a high-frequency inrush pre-breakdown arc is generated only on the vacuum interrupter VI2, so that only the contact surface of the vacuum interrupter VI2 is damaged. Δ Tc is required to exceed the closing time of VI1 to ensure that the contact surface of the vacuum interrupter VI1 is not ablated by the inrush arc; during the opening operation, a time interval Δ To also exists between two breaks. Vacuum interrupter VI1 separates first at time T3 and vacuum interrupter VI2 separates at time T4. The requirement delta To is less than the arcing time of the vacuum arc-extinguishing chamber VI1, and the purpose is To burn the contact of the vacuum arc-extinguishing chamber VI2 by using arc current of hundreds of amperes during switching, so that the damage of high-frequency inrush arc ablation on the surface of the contact is eliminated, and the fracture insulation strength of the contact is improved.
Therefore, based on the series double-fracture vacuum circuit breaker for switching the capacitor bank and the control strategy of asynchronous switching, in the switching process of the switch, the contact processed by the CuCr contact material does not bear ablation of any type of switching current, and ablation of high-frequency inrush current pre-breakdown electric arc and other switching current pre-breakdown electric arcs is completely borne by the CuW contact with strong ablation resistance in the vacuum arc-extinguishing chamber VI2, so that the ablation resistance of the circuit breaker is greatly improved, and the integral insulation strength of the series double fractures is also improved. In the switching-off process of the switch, the contact of the vacuum arc-extinguishing chamber VI1 with strong switching-off capacity is used for switching off the short-circuit fault current, so that the switching-off capacity of the circuit breaker is ensured.
According to the technical scheme, the application provides a control method and a control device for a series double-break vacuum circuit breaker for a capacitor, the method comprises the following steps of using a control switch to control two vacuum arc-extinguishing chambers by using an asynchronous opening and closing method, and the using method comprises the following steps: closing the control switch, controlling the vacuum arc extinguish chamber VI1 to act first, and enabling the contact of the vacuum arc extinguish chamber VI2 to bear the ablation of high-frequency inrush current; and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current.
The application provides a capacitor can carry out asynchronous operation with two fractures of two fracture vacuum circuit breakers of series connection, vacuum circuit breaker VI 1's explosion chamber has very strong ability of breaking short-circuit current, vacuum circuit breaker's VI2 explosion chamber has very strong anti high frequency rush current ablation's ability, based on the above-mentioned control strategy who is used for the two fracture vacuum circuit breakers of series connection and the nonsynchronous of switching capacitor group, make the anti ablation ability of this application improve greatly, the whole dielectric strength who opens and breaks two fractures of series connection also can improve, the ability of opening and breaking of circuit breaker has been guaranteed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a switching operation timing diagram of a control method of a series double-break vacuum circuit breaker for a capacitor according to the present application;
fig. 2 is a state diagram of a fracture and pole loop in a switching-on operation process in the control method of the series double-fracture vacuum circuit breaker for the capacitor provided by the application;
fig. 3 is a state diagram of a fracture and pole loop in the switching-off operation process in the control method of the series double-fracture vacuum circuit breaker for the capacitor provided by the application;
fig. 4 is a schematic structural diagram of a series double-break vacuum circuit breaker for a capacitor provided by the present application.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum, has the advantages of small volume, light weight, suitability for frequent operation and no need of maintenance for arc extinguishing, and is relatively popularized in power distribution networks. The vacuum circuit breaker is an indoor power distribution device in a 3-10 kV and 50Hz three-phase alternating-current system, can be used for protecting and controlling electrical equipment in industrial and mining enterprises, power plants and transformer substations, is particularly suitable for use places requiring no oil, less maintenance and frequent operation, and can be arranged in a middle cabinet, a double-layer cabinet and a fixed cabinet to be used for controlling and protecting high-voltage electrical equipment.
Referring to fig. 1, a switching operation timing chart of the control method for the series double-break vacuum circuit breaker for the capacitor provided by the present application includes the following steps:
the control switch is used for controlling two vacuum arc-extinguishing chambers by applying an asynchronous opening and closing method, and the using method comprises the following steps:
closing the control switch, controlling the vacuum arc extinguish chamber VI1 to act first, and enabling the contact of the vacuum arc extinguish chamber VI2 to bear the ablation of high-frequency inrush current;
and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current.
Referring to fig. 2, in order to provide a state diagram of a circuit of a break and a pole in a closing operation process in the control method of the series double-break vacuum circuit breaker for the capacitor, in a specific embodiment, the action timing characteristics of the control method of the vacuum circuit breaker include:
closing the control switch to carry out closing operation, wherein a time interval delta Tc exists between closing time of the two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched on at the time of T1, and the vacuum arc extinguish chamber VI2 is switched on at the time of T2;
the vacuum arc-extinguishing chamber VI1 realizes no current switching, high-frequency inrush current pre-breakdown electric arcs are only generated on the vacuum arc-extinguishing chamber VI2, and only the contact surface in the vacuum arc-extinguishing chamber VI2 is damaged;
the time interval Δ Tc is longer than the closing time of the vacuum interrupter VI1, and the contact surface of the vacuum interrupter VI1 is not ablated by the inrush arc.
Referring to fig. 3, in a specific embodiment, an action timing sequence characteristic of the vacuum circuit breaker control method further includes:
opening a control switch To perform switching-off operation, wherein a time interval delta To also exists between the switching-on time of two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched off at the time of T3, and the vacuum arc extinguish chamber VI2 is switched off at the time of T4;
the time interval delta To is less than the arcing time of the vacuum arc-extinguishing chamber VI 1;
the contact of the vacuum arc-extinguishing chamber VI2 is aged by arc current of hundreds of amperes generated at the moment of switching on and off, the damage of high-frequency inrush arc ablation on the surface of the contact is eliminated, and the fracture insulation strength of the contact is improved.
Referring to fig. 4, a schematic structural diagram of a series double-break vacuum circuit breaker for a capacitor provided by the present application includes two vacuum interrupters, vacuum interrupter VI1 is configured to open a short-circuit fault current, and vacuum interrupter VI2 is configured to close a high-frequency inrush current.
In a specific embodiment, the material of the contact in the vacuum arc extinguish chamber VI1 is CuCr alloy, and the material of the contact in the vacuum arc extinguish chamber VI2 is CuW alloy.
The CuCr alloy has high short-circuit current breaking capacity, while the CuW alloy has strong ablation resistance and fusion welding resistance.
The invention is further illustrated with reference to the accompanying drawings and examples:
a series double-fracture vacuum circuit breaker for capacitor bank switching is composed of two vacuum arc-extinguishing chambers, two control signals respectively control the two vacuum arc-extinguishing chambers of the circuit breaker to act, a contact in the vacuum arc-extinguishing chamber VI1 is made of CuCr alloy with high short-circuit current breaking capacity, and a contact in the vacuum arc-extinguishing chamber VI2 is made of CuW alloy with high ablation resistance and fusion welding resistance.
By means of time sequence control, the opening (closing) time of the two series fractures is controlled, so that only the contact in the vacuum arc extinguish chamber VI2 is ablated by high-frequency inrush current pre-breakdown electric arcs, and the contact in the vacuum arc extinguish chamber VI1 is responsible for opening and closing short-circuit fault current. Fig. 1 is a timing diagram of switching-on and switching-off operations of a series double-break vacuum circuit breaker, when a switching-off operation is performed, an interval Δ Tc exists between switching-on times of two series vacuum breaks, and after a vacuum arc-extinguishing chamber VI1 which is responsible for switching-off of short-circuit current is switched on at a time T1, a vacuum arc-extinguishing chamber VI2 which is responsible for switching-off of high-frequency inrush current is switched on at a time T2. In this way, the vacuum interrupter VI1 is switched on and off without current, and the high-frequency inrush pre-breakdown arc is generated only on the vacuum interrupter VI2, and only the contact surface of the vacuum interrupter VI2 is damaged. Δ Tc is required to exceed the closing time of vacuum interrupter VI1 to ensure that the contact surface of vacuum interrupter VI1 is not ablated by inrush arc; during the opening operation, a time interval Δ To also exists between two breaks. Vacuum interrupter VI1 separates first at time T3 and vacuum interrupter VI2 separates at time T4. The requirement delta To is less than the arcing time of the vacuum arc-extinguishing chamber VI1, and the purpose is To burn the contact in the vacuum arc-extinguishing chamber VI2 by using hundreds of amperes of arc current when the contact is opened, so that the damage of the high-frequency inrush current arc ablation on the surface of the contact is eliminated, and the fracture insulation strength of the contact is improved. The states of the fracture and pole loops in the closing and opening operation processes of the series double-fracture vacuum circuit breaker in the whole closing and opening process are shown in fig. 2 and 3.
The application provides a control method and a device for a series double-fracture vacuum circuit breaker for a capacitor, the method comprises the following steps of using a control switch to control two vacuum arc-extinguishing chambers by using an asynchronous opening and closing method, and the using method comprises the following steps: closing the control switch, controlling the vacuum arc extinguish chamber VI1 to act first, and enabling the contact of the vacuum arc extinguish chamber VI2 to bear the ablation of high-frequency inrush current; and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current. The application provides a capacitor can carry out asynchronous operation with two fractures of two fracture vacuum circuit breakers of series connection, vacuum circuit breaker VI 1's explosion chamber has very strong ability of breaking short-circuit current, vacuum circuit breaker's VI2 explosion chamber has very strong anti high frequency rush current ablation's ability, based on the above-mentioned control strategy who is used for the two fracture vacuum circuit breakers of series connection and the nonsynchronous of switching capacitor group, make the anti ablation ability of this application improve greatly, the whole dielectric strength who opens and breaks two fractures of series connection also can improve, the ability of opening and breaking of circuit breaker has been guaranteed.
While there have been shown and described what are at present considered the fundamental principles and essential features of the application, and advantages thereof, it will be apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (5)
1. A control method of a series double-break vacuum circuit breaker for a capacitor comprises the following steps:
the control switch is used for controlling two vacuum arc-extinguishing chambers by applying an asynchronous opening and closing method, and the using method comprises the following steps:
closing the control switch, controlling the vacuum arc extinguish chamber VI1 to act first, and enabling the contact of the vacuum arc extinguish chamber VI2 to bear the ablation of high-frequency inrush current;
and opening the control switch to control the vacuum arc extinguish chamber VI1 to act first to cut off the short-circuit fault current.
2. The method for controlling a series double-break vacuum circuit breaker for capacitors as claimed in claim 1, wherein the action timing characteristics of the vacuum circuit breaker control method comprise:
closing the control switch to carry out closing operation, wherein a time interval delta Tc exists between closing time of the two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched on at the time of T1, and the vacuum arc extinguish chamber VI2 is switched on at the time of T2;
the vacuum arc-extinguishing chamber VI1 realizes no current switching, high-frequency inrush current pre-breakdown electric arcs are only generated on the vacuum arc-extinguishing chamber VI2, and only the contact surface in the vacuum arc-extinguishing chamber VI2 is damaged;
the time interval Δ Tc is longer than the closing time of the vacuum interrupter VI1, and the contact surface of the vacuum interrupter VI1 is not ablated by the inrush arc.
3. The method for controlling a series double-break vacuum circuit breaker for a capacitor as claimed in claim 1, wherein the action timing characteristics of the vacuum circuit breaker control method further comprise:
opening a control switch To perform switching-off operation, wherein a time interval delta To also exists between the switching-on time of two series vacuum fractures;
the vacuum arc extinguish chamber VI1 is switched off at the time of T3, and the vacuum arc extinguish chamber VI2 is switched off at the time of T4;
the time interval delta To is less than the arcing time of the vacuum arc-extinguishing chamber VI 1;
the contact of the vacuum arc-extinguishing chamber VI2 is aged by arc current of hundreds of amperes generated at the moment of switching on and off, the damage of high-frequency inrush arc ablation on the surface of the contact is eliminated, and the fracture insulation strength of the contact is improved.
4. A series double break vacuum circuit breaker for capacitors, characterized by comprising two vacuum interrupters, wherein vacuum interrupter VI1 is configured to open short circuit fault current and vacuum interrupter VI2 is configured to close high frequency inrush current.
5. The series double-break vacuum circuit breaker for the capacitor as claimed in claim 4, wherein the material of the contact in the vacuum interrupter VI1 is CuCr alloy, and the material of the contact in the vacuum interrupter VI2 is CuW alloy.
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| CN202110437787.8A CN113178353A (en) | 2021-04-22 | 2021-04-22 | Control method and device for series double-break vacuum circuit breaker for capacitor |
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| CN202110437787.8A CN113178353A (en) | 2021-04-22 | 2021-04-22 | Control method and device for series double-break vacuum circuit breaker for capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814568A (en) * | 2022-06-29 | 2022-07-29 | 中国电力科学研究院有限公司 | Closing and aging test device for vacuum circuit breaker and aging parameter determination method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779681A (en) * | 2012-08-03 | 2012-11-14 | 库柏(宁波)电气有限公司 | Method for operating vacuum circuit breaker |
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- 2021-04-22 CN CN202110437787.8A patent/CN113178353A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779681A (en) * | 2012-08-03 | 2012-11-14 | 库柏(宁波)电气有限公司 | Method for operating vacuum circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814568A (en) * | 2022-06-29 | 2022-07-29 | 中国电力科学研究院有限公司 | Closing and aging test device for vacuum circuit breaker and aging parameter determination method |
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