CN216086150U - Control device for preventing earth fault load shedding of 220KV system - Google Patents
Control device for preventing earth fault load shedding of 220KV system Download PDFInfo
- Publication number
- CN216086150U CN216086150U CN202122176522.5U CN202122176522U CN216086150U CN 216086150 U CN216086150 U CN 216086150U CN 202122176522 U CN202122176522 U CN 202122176522U CN 216086150 U CN216086150 U CN 216086150U
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- insulating cylinder
- circuit breaker
- power supply
- vacuum circuit
- terminal controller
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- 230000007935 neutral effect Effects 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for AC systems
- H02H3/165—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for AC systems for three-phase systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
本实用新型涉及电气技术领域，特别涉及一种220KV系统防止接地故障甩负荷控制装置，包括快速真空断路器、上绝缘筒、下绝缘筒、高精度电源、终端控制器、洛克线圈、隔离变压器、后台控制器、检修节和光纤；本实用新型提供的220KV系统防止接地故障甩负荷控制装置，当发生单相接地短路事故时，装置终端控制器通过采样洛克线圈的电流判断是否超过设定阈值，若超过设定阈值，则发出分闸脉冲给快速真空断路器，使快速真空断路器快速分闸，在16ms内，将原来直接接地的110KV主变中性点，转换为中性点短时不接地系统，使得110KV系统三相电压迅速恢复到平衡值，不会出现电压暂降问题，也抑制了大面积甩负荷事故，保护系统运行安全。
The utility model relates to the field of electrical technology, in particular to a 220KV system preventing ground fault load rejection control device, comprising a fast vacuum circuit breaker, an upper insulating cylinder, a lower insulating cylinder, a high-precision power supply, a terminal controller, a lock coil, an isolation transformer, Background controller, maintenance section and optical fiber; the 220KV system provided by the utility model prevents the ground fault load shedding control device, when a single-phase grounding short-circuit accident occurs, the device terminal controller judges whether it exceeds the set threshold by sampling the current of the Locke coil, If it exceeds the set threshold, it will send an opening pulse to the fast vacuum circuit breaker, so that the fast vacuum circuit breaker can be quickly opened, and within 16ms, the neutral point of the 110KV main transformer, which was originally directly grounded, will be converted to a neutral point. The grounding system enables the three-phase voltage of the 110KV system to quickly return to the equilibrium value, without the problem of voltage sag, and also suppresses large-scale load shedding accidents and protects the safe operation of the system.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to a load shedding control device for preventing a 220KV system from earth faults.
Background
When a 220KV neutral point direct grounding system runs, a single-phase grounding fault often occurs, and the zero sequence protection action of a short-circuit fault line is caused to jump the grounding line. On the other hand, the 110KV neutral point of the transformer in the substation at the end of the 220KV line must be directly grounded as required. When the 220KV side circuit is in single-phase grounding, the phenomenon of serious imbalance of three-phase voltage occurs at the 110KV side in the transient process, so that the load at the 110KV side is subjected to voltage sag, and a large-area load shedding accident occurs. Therefore, a new device is needed, so that the problem of large-area load shedding on the 110KV side can not occur when a single-phase ground short circuit occurs in a 220KV system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a control device for preventing earth fault load shedding of a 220KV system, which can prevent a large-area load shedding power failure accident caused by voltage sag due to serious unmatched three-phase voltage at a 110KV side when a single-phase earth short circuit occurs in the 220KV system.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a220 KV system load shedding prevention control device for preventing ground faults comprises a rapid vacuum circuit breaker, an upper insulating cylinder, a lower insulating cylinder, a high-precision power supply, a terminal controller, a Rocker coil, an isolation transformer, a background controller, an overhaul node and an optical fiber;
the upper end interface of the rapid vacuum circuit breaker is connected with the upper outlet row of the upper insulating cylinder to form a first outlet row which is led out of the upper insulating cylinder, and the first outlet row is connected with a 110KV neutral point of a main transformer;
the lower end interface of the quick vacuum circuit breaker is connected with the lower wire outlet row of the lower insulating cylinder to form a second lead-out row which is led out of the lower insulating cylinder and connected with the existing system grounding row;
the Rocker coil is fixed on the wire outlet side of the rapid vacuum circuit breaker and used for meeting the measurement requirement on current;
an input power supply of the terminal controller is connected with an alternating current 220V output lead of the isolation transformer, and two pairs of output lines are respectively connected to a switching-off triggering interface and a switching-on triggering interface of a high-precision power supply; the other pair of input interfaces of the terminal controller is connected with the output line of the Rockwell coil;
and the input power supply of the high-precision power supply is connected with an alternating current 220V output lead of the isolation transformer, and the other two pairs of input interfaces of the high-precision power supply are respectively connected to a switching-off trigger output interface and a switching-on trigger output interface of the terminal controller.
In a further technical scheme, the two pairs of optical fiber interfaces of the terminal controller are connected to the input end of the main control board of the background controller through optical fibers, so as to meet the requirement of information transmission.
Compared with the prior art, the utility model has the following technical effects:
according to the control device for preventing the earth fault load shedding of the 220KV system, when a single-phase earth short-circuit accident occurs, the terminal controller of the device judges whether the current of the Rocker coil exceeds a set threshold value or not by sampling, if the current exceeds the set threshold value, a brake-off pulse is sent to the rapid vacuum circuit breaker to enable the rapid vacuum circuit breaker to rapidly open the brake, and within 16ms, the original directly-grounded 110KV main transformer neutral point is converted into a neutral point short-time ungrounded system, so that the three-phase voltage of the 110KV system is rapidly recovered to a balance value, the problem of voltage sag is avoided, the large-area load shedding accident is also inhibited, and the operation safety of the system is protected.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a schematic diagram of a 220KV system ground fault load shedding prevention control device in the utility model;
the reference numbers in the figures illustrate: the method comprises the following steps of 1-a rapid vacuum circuit breaker, 2-an upper insulating cylinder, 3-a lower insulating cylinder, 4-a high-precision power supply, 5-a terminal controller, 6-a rock coil, 7-an isolation transformer, 8-a background controller, 9-a maintenance joint and 10-an optical fiber.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further clarified by combining the specific drawings.
As described above, with reference to fig. 1, the present invention provides a load shedding control device for preventing ground fault in a 220KV system, which includes a fast vacuum circuit breaker 1, an upper insulating cylinder 2, a lower insulating cylinder 3, a high-precision power supply 4, a terminal controller 5, a rock coil 6, an isolation transformer 7, a background controller 8, a maintenance node 9, and an optical fiber 10;
the upper end interface of the rapid vacuum circuit breaker 1 is connected with the upper outlet row of the upper insulating cylinder 2 to form a first outlet row which is led out of the upper insulating cylinder 2, and the first outlet row is connected with a 110KV neutral point of a main transformer;
a lower end interface of the rapid vacuum circuit breaker 1 is connected with a lower outlet row of the lower insulating cylinder 3 to form a second outlet row which is led out of the lower insulating cylinder 3 and is connected with an existing system grounding row;
the Rocker coil 6 is fixed on the outlet side of the rapid vacuum circuit breaker 1 and used for meeting the measurement requirement on current;
an input power supply of the terminal controller 5 is connected with an alternating current 220V output lead of the isolation transformer 7, and two pairs of output lines are respectively connected to an opening triggering interface and a closing triggering interface of the high-precision power supply 4; the other pair of input interfaces of the terminal controller 5 is connected with the output line of the Rockwell coil 6;
the input power supply of the high-precision power supply 4 is connected with the alternating current 220V output lead of the isolation transformer 7, and the other two pairs of input interfaces of the high-precision power supply 4 are respectively connected to the opening trigger output interface and the closing trigger output interface of the terminal controller 5.
The two pairs of optical fiber interfaces of the terminal controller 5 are connected to the input end of the main control board of the background controller 8 through optical fibers 10, so as to meet the requirement of information transmission.
The 220KV system load shedding control device for preventing the ground fault is connected between a main transformer neutral point and a transformer substation grounding electrode in series, and when the device is in normal operation, the rapid vacuum circuit breaker 1 in the device is in a closing state, so that the direct good grounding of the 110KV neutral point is ensured.
When a 220KV system has a single-phase grounding short circuit, the terminal controller 5 judges that the current exceeds a set threshold value in about 2ms, and sends a brake opening instruction to open the contact of the rapid vacuum circuit breaker 1, so that a neutral point grounding loop is rapidly disconnected in 16ms, the 110KV system is changed into a neutral point temporarily ungrounded system to operate, the 110KV three-phase voltage keeps a matched state, the problem of voltage sag cannot occur, a large-area load shedding accident is also inhibited, and the operation safety of the system is protected. And then, the terminal controller transmits the fault information and the wave recording waveform to the background controller through the optical fiber, and the background controller transmits the information to the control neutral for processing.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (2)
1. A load shedding control device for preventing ground faults in a 220KV system is characterized by comprising a quick vacuum circuit breaker (1), an upper insulating cylinder (2), a lower insulating cylinder (3), a high-precision power supply (4), a terminal controller (5), a Rocker coil (6), an isolation transformer (7), a background controller (8), an overhaul joint (9) and an optical fiber (10);
an upper end port of the rapid vacuum circuit breaker (1) is connected with an upper wire outlet row of the upper insulating cylinder (2) to form a first lead-out row which is led out of the upper insulating cylinder (2), and the first lead-out row is connected with a 110KV neutral point of a main transformer;
a lower end interface of the rapid vacuum circuit breaker (1) is connected with a lower wire outlet row of the lower insulating cylinder (3) to form a second lead-out row which is led out of the lower insulating cylinder (3), and the second lead-out row is connected with a grounding row of the existing system;
the Rocker coil (6) is fixed on the wire outlet side of the rapid vacuum circuit breaker (1) and used for meeting the measurement requirement on current;
an input power supply of the terminal controller (5) is connected with an alternating current 220V output lead of the isolation transformer (7), and two pairs of output lines are respectively connected to a switching-off triggering interface and a switching-on triggering interface of the high-precision power supply (4); the other pair of input interfaces of the terminal controller (5) is connected with the output line of the Rocker coil (6);
the input power supply of the high-precision power supply (4) is connected with an alternating current 220V output lead of the isolation transformer (7), and the other two pairs of input interfaces of the high-precision power supply (4) are respectively connected to an opening trigger output interface and a closing trigger output interface of the terminal controller (5).
2. The device for preventing ground fault load shedding control in a 220KV system according to claim 1, wherein the two pairs of optical fiber interfaces of the terminal controller (5) are connected to the input end of the main control board of the background controller (8) through an optical fiber (10) for satisfying the requirement of information transmission.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021109447097 | 2021-08-17 | ||
| CN202110944709 | 2021-08-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216086150U true CN216086150U (en) | 2022-03-18 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111051001.5A Active CN113765078B (en) | 2021-08-17 | 2021-09-08 | A 220KV system load shedding control device to prevent grounding faults |
| CN202122176522.5U Withdrawn - After Issue CN216086150U (en) | 2021-08-17 | 2021-09-08 | Control device for preventing earth fault load shedding of 220KV system |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111051001.5A Active CN113765078B (en) | 2021-08-17 | 2021-09-08 | A 220KV system load shedding control device to prevent grounding faults |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765078A (en) * | 2021-08-17 | 2021-12-07 | 安徽合凯电气科技股份有限公司 | A 220KV system to prevent ground fault load shedding control device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201638657U (en) * | 2010-04-20 | 2010-11-17 | 河南省电力公司漯河供电公司 | Packaging Structure of Classified Insulation Neutral Protection Device for 110kV Power Transformer |
| CN203883464U (en) * | 2013-11-19 | 2014-10-15 | 上海翱辰电气科技有限公司 | Controllable small-resistor arc-extinguishing device |
| WO2018131797A1 (en) * | 2017-01-11 | 2018-07-19 | 주식회사 나은에너지 | Real-time detection/recovery system of power line failure in power distribution system and construction method therefor |
| CN213025920U (en) * | 2020-03-16 | 2021-04-20 | 保定钰鑫电气科技有限公司 | Neutral point grounding structure of three-phase alternating current power system |
| CN113765078B (en) * | 2021-08-17 | 2024-12-06 | 安徽合凯电气科技股份有限公司 | A 220KV system load shedding control device to prevent grounding faults |
-
2021
- 2021-09-08 CN CN202111051001.5A patent/CN113765078B/en active Active
- 2021-09-08 CN CN202122176522.5U patent/CN216086150U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765078A (en) * | 2021-08-17 | 2021-12-07 | 安徽合凯电气科技股份有限公司 | A 220KV system to prevent ground fault load shedding control device |
| CN113765078B (en) * | 2021-08-17 | 2024-12-06 | 安徽合凯电气科技股份有限公司 | A 220KV system load shedding control device to prevent grounding faults |
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| Publication number | Publication date |
|---|---|
| CN113765078B (en) | 2024-12-06 |
| CN113765078A (en) | 2021-12-07 |
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Granted publication date: 20220318 Effective date of abandoning: 20241206 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20220318 Effective date of abandoning: 20241206 |
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