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
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- 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
- vacuum circuit
- power supply
- load shedding
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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)
Abstract
The utility model relates to the technical field of electricity, in particular to a load shedding control device for preventing a 220KV system from being grounded, which comprises a quick 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, a maintenance section and an optical fiber, wherein the quick vacuum circuit breaker is connected with the upper insulating cylinder; 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.
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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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111051001.5A Pending CN113765078A (en) | 2021-08-17 | 2021-09-08 | Control device for preventing earth fault load shedding of 220KV system |
| CN202122176522.5U Active 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 |
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| CN202111051001.5A Pending CN113765078A (en) | 2021-08-17 | 2021-09-08 | Control device for preventing earth fault load shedding of 220KV system |
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| CN (2) | CN113765078A (en) |
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2021
- 2021-09-08 CN CN202111051001.5A patent/CN113765078A/en active Pending
- 2021-09-08 CN CN202122176522.5U patent/CN216086150U/en active Active
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| CN113765078A (en) | 2021-12-07 |
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