CN111600283A - Power system protection method and rapid opening type permanent magnet circuit breaker switching equipment - Google Patents
Power system protection method and rapid opening type permanent magnet circuit breaker switching equipment Download PDFInfo
- Publication number
- CN111600283A CN111600283A CN202010482008.1A CN202010482008A CN111600283A CN 111600283 A CN111600283 A CN 111600283A CN 202010482008 A CN202010482008 A CN 202010482008A CN 111600283 A CN111600283 A CN 111600283A
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- China
- Prior art keywords
- power system
- circuit breaker
- permanent magnet
- magnet circuit
- protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a power system protection method and a rapid opening permanent magnet circuit breaker switch device, the method subdivides the power system in a protection area into five-level differential protection, and the rapid opening permanent magnet circuit breaker switch device is arranged in each level differential protection area; when a single-phase grounding or phase-to-phase fault occurs in the power system, the fault line is cut off through the rapid opening type permanent magnet circuit breaker switching device. The switching equipment of the rapid opening type permanent magnet circuit breaker with the inherent opening time not more than 5ms is provided for realizing the method, and the power system can be divided into five levels of 300ms, 225ms, 150ms, 75ms and 0ms by adopting the switching equipment to protect the power grid. The invention can be widely applied to 10-35kV power systems, in particular to domestic 10-35kV alternating current distribution network systems, can cut off fault lines more quickly, effectively reduces the power failure range and shortens the power failure time.
Description
Technical Field
The invention relates to a relay protection technology and applied switch equipment, in particular to a power system protection method and rapid opening type permanent magnet circuit breaker switch equipment.
Background
The switch equipment is used as an important ring in a power transmission and distribution system, along with the continuous deepening of urban and rural power grid transformation, particularly along with the development of national economy and the improvement of urbanization degree, electric power is the supporting industry of the national economy, and the used switch equipment takes a spring operating mechanism as a column. Along with the improvement of the continuous development of the living standard and the industrial standard of residents, power customers also put forward high requirements on the power consumption quality, the power failure can influence the development of national economy, and meanwhile, the economic loss of voltage sensitive customers such as industrial robots and automatic machine beds is easily caused due to the occurrence of the system voltage sag phenomenon caused by the power failure.
In the process of building a power distribution network system in China, the protection time from the outlet of a transformer substation to a terminal user is only 300ms, a spring operating mechanism with the inherent brake-off time of about 40-60ms is adopted, the relay protection time and the arc extinguishing time are added, the time for completing the disconnection of the whole line is about 125ms, and the power distribution network can only be divided into three-level power networks, namely three levels of 300ms, 150ms and 0 ms. The inherent brake-separating time of the switch equipment limited by the spring mechanism can not be shortened, the power supply can not be further subdivided, and the spring operating mechanism has the defects of large quantity of parts, complex transmission and higher failure rate, and particularly brings about the phenomenon that the equipment is easily failed due to corrosion of the mechanism and the like when the spring operating mechanism is arranged outside the box body, so that the power failure phenomenon is frequent.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a power system protection method and a rapid opening permanent magnet circuit breaker switching device suitable for the scheme, which can be widely applied to a 10-35kV power system, especially a domestic 10-35kV alternating current distribution network system, and can cut off a fault line more rapidly when a single-phase grounding or interphase fault occurs in the power system, thereby effectively reducing the power failure range and shortening the power failure time.
The technical scheme is as follows: the technical scheme adopted by the invention is a power system protection method, the method subdivides a power system in a protection area into five-level differential protection, and fast opening permanent magnet circuit breaker switching equipment is arranged in each level differential protection area; when a single-phase grounding or phase-to-phase fault occurs in the power system, the fault line is cut off through the rapid opening type permanent magnet circuit breaker switching device.
The power system in the protection area is subdivided into five levels of differential protection, and the line disconnection time of the power system is divided into five levels.
Further, the subdivision of the power system in the protection area into the five-level differential protection includes subdivision of a bus of the power system into the five-level differential protection, and subdivision of branch lines in the power system into the five-level differential protection respectively.
The method is particularly suitable for a 10-35kV alternating current distribution network system, the power system in a distribution network area is subdivided into five-level differential protection, and the typical five-level differential protection is that the line disconnection time of the distribution system is divided into five grades of 300ms, 225ms, 150ms, 75ms and 0 ms.
The protection scheme is applicable to a power system protection scheme of a 10-35kV alternating-current power distribution network system, the inherent opening time of the rapid opening type permanent magnet circuit breaker switching equipment is not more than 5ms, the relay protection action time and the arc extinguishing time are counted, the time required by the rapid opening type permanent magnet circuit breaker switching equipment to complete opening and closing is not more than 65ms, and the five-level difference protection scheme is met.
The invention also provides a rapid opening permanent magnetic circuit breaker switching device applied to the power system protection method, which comprises a low-voltage box 1, a cable chamber 2, a mechanism operation chamber 3 and an air box 5, wherein quadratic elements including an ammeter, a voltmeter and a line protection are arranged in the low-voltage box 1 and are used for measuring and protecting the line and isolating the line after the fault occurs; a permanent magnet circuit breaker 4 is arranged in the gas box 5 and used for completing circuit breaking; the cable chamber 2 is used for accommodating incoming and outgoing cables; the mechanism operating chamber 3 is internally provided with a switching-on and switching-off indication of the mechanism and a controller module for completing switching-on and switching-off of the permanent magnetic mechanism; the permanent magnet circuit breaker 4 adopts a rapid opening type permanent magnet circuit breaker with the inherent opening time not more than 5 ms.
Wherein, gas tank 5 adopts the leakproofness gas tank, permanent magnetism circuit breaker 4 is sealed in sealed gas tank 5, has avoided placing the mechanism in the box outside and the phenomenon that the mechanism corrosion etc. that brings easily lead to equipment trouble takes place.
Has the advantages that: compared with the prior art, the power distribution network is divided into a five-level differential protection power grid, when a single-phase grounding or interphase fault occurs in a power system, a fault line can be cut off quickly, the power failure range is effectively reduced, and the power failure time is shortened. Meanwhile, the permanent magnet circuit breaker is sealed in the closed gas box, so that the phenomenon that equipment faults are easily caused by mechanism corrosion and the like caused by the fact that the mechanism is arranged on the outer side of the box body is avoided.
Drawings
FIG. 1 is a typical five-level difference protection grid scheme according to the present invention;
fig. 2 is a schematic structural view of the switching device of the rapid opening permanent magnet circuit breaker according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The invention provides a scheme for subdividing a power system into five-stage differential protection power grid regions, wherein rapid brake-separating type permanent magnet circuit breaker switching equipment is arranged in each stage differential protection region. When a single-phase grounding or interphase fault occurs in the power system, the fault line is cut off through the rapid opening type permanent magnet circuit breaker switching equipment, so that the power failure range can be effectively reduced, and the power failure time can be shortened. The five-level differential protection is to divide the line disconnection time of the power system into five grades. The five-level differential protection comprises the steps of subdividing a bus of the power system into five-level differential protection and subdividing each branch line in the power system into five-level differential protection respectively. After the rapid opening type permanent magnet circuit breaker switching equipment is configured in each stage of stage difference protection area, a five-stage difference protection power grid scheme can be realized. When a single-phase grounding or interphase fault occurs in a power system, the fault line is quickly cut off through the quick opening type permanent magnet circuit breaker switching equipment, so that the power failure range is reduced, and the power failure time is shortened.
The protection method of the power system can be applied to a domestic 10-35kV alternating current power distribution network system, a typical five-level differential protection power grid scheme is shown in figure 1, and the power distribution network is divided into five-level differential protection, namely, the line disconnection time of the power system is divided into five levels of 300ms, 225ms, 150ms, 75ms and 0 ms.
In order to realize a five-level differential protection scheme of 300ms, 225ms, 150ms, 75ms and 0ms, the rapid opening type permanent magnet circuit breaker switching equipment is required to have the remarkable characteristic that the inherent opening time is less than or equal to 5ms, and the time required for completing the circuit breaking is less than or equal to 65ms after the relay protection action time and the arc extinguishing time are included.
Therefore, the rapid opening type permanent magnet circuit breaker switching equipment is provided, which is similar to the existing switching equipment and mainly comprises a low-voltage box 1, a cable chamber 2, a mechanism operating chamber 3 and a sealing air box 5 containing a rapid opening type permanent magnet circuit breaker 4. The low-voltage box 1 is internally provided with secondary elements such as an ammeter, a voltmeter and line protection, and is used for measuring and protecting a line and isolating the line after a fault occurs; a rapid opening permanent magnetic circuit breaker 4 is arranged in the air box 5 and used for completing the circuit breaking; the cable chamber 2 is used for accommodating incoming and outgoing cables; and the mechanism operating chamber 3 is internally provided with a switching-on and switching-off indication of the mechanism and a controller module for completing switching-on and switching-off of the permanent magnetic mechanism. Different from the existing switch equipment, the permanent magnet circuit breaker 4 in the scheme adopts a rapid opening type permanent magnet circuit breaker with the inherent opening time not more than 5 ms.
The gas tank 5 adopts a sealing gas tank, and the rapid opening type permanent magnet circuit breaker 4 can be sealed in the sealing gas tank 5, so that the phenomenon that equipment faults are easily caused by mechanism corrosion and the like caused by arranging a mechanism outside the tank body is avoided.
The permanent magnet circuit breaker switching device described in the embodiment is a product scheme used in a three-phase alternating current system, and three single-phase operating mechanisms drive an ABC three-phase circuit breaker to realize the switching-on and switching-off operation of a power supply line.
Claims (7)
1. A power system protection method is characterized in that the method subdivides a power system in a protection area into five-level differential protection, and fast brake-separating type permanent magnet circuit breaker switching equipment is arranged in each level differential protection area; when a single-phase grounding or phase-to-phase fault occurs in the power system, the fault line is cut off through the rapid opening type permanent magnet circuit breaker switching device.
2. The power system protection method according to claim 1, characterized in that: the electric power system in the protection area is subdivided into five levels of differential protection, and the line disconnection time of the electric power system is divided into five levels.
3. The power system protection method according to claim 1, characterized in that: the method for protecting the power system in the protection area comprises the steps of subdividing a bus of the power system into five-level differential protection, and subdividing each branch line in the power system into five-level differential protection.
4. The power system protection method according to claim 1, characterized in that: the method is applied to a 10-35kV alternating current distribution network system, and the line disconnection time of the distribution system is divided into five grades of 300ms, 225ms, 150ms, 75ms and 0 ms.
5. The power system protection method according to claim 4, characterized in that: the inherent opening time of the rapid opening type permanent magnet circuit breaker switching equipment is not more than 5ms, the action time and the arc extinguishing time of relay protection are counted, and the time required for completing opening and closing of the rapid opening type permanent magnet circuit breaker switching equipment is not more than 65 ms.
6. A fast opening permanent magnetic breaker switching device applied to the power system protection method of any one of claims 1 to 5, characterized in that the device comprises a low-voltage box (1), a cable chamber (2), a mechanism operating chamber (3) and a gas box (5), wherein secondary elements including an ammeter, a voltmeter and a line protection are arranged in the low-voltage box (1) and are used for measuring and protecting the line and isolating the line after the fault occurs; a permanent magnet circuit breaker (4) is arranged in the gas box (5) and used for completing circuit breaking; the cable chamber (2) is used for accommodating an incoming and outgoing cable; the mechanism operating chamber (3) is internally provided with a switching-on and switching-off indication of the mechanism and a controller module for completing switching-on and switching-off of the permanent magnetic mechanism; the permanent magnet circuit breaker (4) adopts a rapid opening type permanent magnet circuit breaker with the inherent opening time not more than 5 ms.
7. The switching device of a fast opening permanent magnetic circuit breaker according to claim 6, characterized in that: the gas tank (5) adopts a sealing gas tank, and the permanent magnet circuit breaker (4) is sealed in the sealing gas tank (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010482008.1A CN111600283A (en) | 2020-05-29 | 2020-05-29 | Power system protection method and rapid opening type permanent magnet circuit breaker switching equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010482008.1A CN111600283A (en) | 2020-05-29 | 2020-05-29 | Power system protection method and rapid opening type permanent magnet circuit breaker switching equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111600283A true CN111600283A (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010482008.1A Pending CN111600283A (en) | 2020-05-29 | 2020-05-29 | Power system protection method and rapid opening type permanent magnet circuit breaker switching equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111600283A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896496A (en) * | 2016-06-15 | 2016-08-24 | 深圳市粤能电气有限公司 | Multi-stage differential protection power distribution automation device employing magnetic-control rapid circuit breaker |
| CN108376974A (en) * | 2018-02-11 | 2018-08-07 | 国网陕西省电力公司电力科学研究院 | A kind of power distribution network relay protection system based on current limliting Graded coordination |
| CN209313218U (en) * | 2018-12-05 | 2019-08-27 | 库柏爱迪生(平顶山)电子科技有限公司 | Quick disjunction permanent-magnet breaker cabinet |
-
2020
- 2020-05-29 CN CN202010482008.1A patent/CN111600283A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896496A (en) * | 2016-06-15 | 2016-08-24 | 深圳市粤能电气有限公司 | Multi-stage differential protection power distribution automation device employing magnetic-control rapid circuit breaker |
| CN108376974A (en) * | 2018-02-11 | 2018-08-07 | 国网陕西省电力公司电力科学研究院 | A kind of power distribution network relay protection system based on current limliting Graded coordination |
| CN209313218U (en) * | 2018-12-05 | 2019-08-27 | 库柏爱迪生(平顶山)电子科技有限公司 | Quick disjunction permanent-magnet breaker cabinet |
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Application publication date: 20200828 |