CN113629672A - Method and device for rapidly and intelligently isolating faults of power distribution network in zero second after overcurrent - Google Patents
Method and device for rapidly and intelligently isolating faults of power distribution network in zero second after overcurrent Download PDFInfo
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- CN113629672A CN113629672A CN202111004668.XA CN202111004668A CN113629672A CN 113629672 A CN113629672 A CN 113629672A CN 202111004668 A CN202111004668 A CN 202111004668A CN 113629672 A CN113629672 A CN 113629672A
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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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
- H02H3/08—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 excess current
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method for quickly and intelligently isolating faults of a power distribution network when the power distribution network is overcurrent for a period of zero seconds, when a certain section of a main line has a fault, feeder terminal devices corresponding to an in-station switch and a section switch at the upstream of the section detect fault current, and if the fault current exceeds a set value of the overcurrent for a period of current, the in-station switch and the section switch trip quickly according to 0 s; each feeder line terminal device controls the section switches of the non-fault sections from top to bottom step by step according to a switch network topological graph to start reclosing, quickly identifies fault points, and locks the section switches at two ends of the fault points in an opening and closing mode, so that a fault area is isolated; reclosing the switch in the station within the set reclosing time, and recovering the upstream power supply of the fault point; and the interconnection switch starts closing and recovers the downstream power supply of the fault point. The invention can isolate the fault between the front switch and the rear switch of the fault area, thereby minimizing the fault area, recovering the upstream power supply and the downstream power supply of the non-fault area in time, and maximally improving the automation level of the distribution network and the power supply reliability.
Description
Technical Field
The invention relates to feeder automation of a power distribution network, in particular to a method and a device for quickly and intelligently isolating faults of the power distribution network when the power distribution network is overcurrent for a period of zero seconds.
Background
The three-section type current protection is that under different overcurrent values, different delay action times are set to avoid work spike current, so that when a short-circuit fault occurs to a line, only the circuit breaker closest to an accident point acts to reduce the influence range of power failure. When the station is subjected to overcurrent for a period of time and is set to be 0S protection, the short-circuit fault current of the line exceeds a fixed value of the overcurrent for a period of time, so that the switch in the station is tripped to cause power failure of the whole line, the fault cannot be quickly and effectively isolated, and the power supply can be recovered after the switch is checked and repaired. The long-time power failure brings huge economic loss, and also brings huge influence on the power supply reliability and the satisfaction degree of service. Therefore, the method for intelligently isolating the fault of the power distribution network quickly is provided, wherein the fault can be isolated quickly when the power distribution network is in overcurrent for a period of zero seconds.
Disclosure of Invention
The invention provides a method and a device for quickly and intelligently isolating faults of a power distribution network when the power distribution network is overcurrent for a period of zero seconds, and mainly aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
a method for quickly and intelligently isolating faults of a power distribution network when the power distribution network is overcurrent for a period of zero seconds comprises the following steps:
(1) the main lines are connected with the switch in the station, all sections of the main lines are connected by the section switch, two adjacent main lines are connected by the interconnection switch, the interconnection switch is normally open, and the section switch is normally closed;
(2) each section switch and each interconnection switch are provided with feeder line terminal devices, a switch network topological graph of the trunk line is recorded into each feeder line terminal device, and the feeder line terminal devices are mutually communicated and connected;
(3) when a section of the main line has a fault, feeder terminal devices corresponding to the in-station switch and the section switch at the upstream of the section detect fault current, if the fault current exceeds a set value of an overcurrent section current, the in-station switch and the section switch trip rapidly according to 0s to isolate the fault;
(4) each feeder line terminal device controls the section switches of the non-fault sections from top to bottom step by step according to a switch network topological graph to start reclosing, quickly identifies fault points, and locks the section switches at two ends of the fault points in an opening and closing mode, so that a fault area is isolated;
(5) reclosing the switch in the station within the set reclosing time, and recovering the upstream power supply of the fault point;
(6) and the interconnection switch starts closing and recovers the downstream power supply of the fault point.
Further, if the feeder line terminal device senses own brake opening and a lower-stage section switch is also opened, controlling the section switch to start reclosing; if the feeder line terminal device senses self brake-off and the lower stage section switch is switched on, controlling the section switch to start brake-off locking; and if the feeder line terminal device senses self closing and the upper-level section switch is switched off and locked, controlling the section switch to start switching off and locking, thereby isolating the fault point.
Further, in the step (6), the feeder terminal device of the interconnection switch senses the opening and closing of the section switch before and after the fault point, and starts closing to recover the downstream power supply of the fault point under the conditions of opening and single-side pressure.
Further, in the step (5), the set reclosing time is 1.5 s.
A device capable of quickly and intelligently isolating faults when a power distribution network is overcurrent for a period of zero seconds comprises an in-station switch, main lines, section switches and interconnection switches, wherein the main lines are connected with the in-station switch, two adjacent main lines are connected through the interconnection switches, and all sections of the main lines are connected through the section switches; each section switch and each interconnection switch are provided with feeder line terminal devices which are in communication connection with each other, and a switch network topological graph of a trunk line is recorded in each feeder line terminal device; each feeder line terminal device senses the switch state information of the whole main line through data interaction and executes the intelligent fault isolation method.
Furthermore, the feeder line terminal device comprises a CPU module, a telemetry module, a remote signaling module, a remote control module and a synchronization module which are connected with the CPU module; the telemetering module is used for acquiring an electric quantity analog value on a trunk line; the remote signaling module is used for acquiring the state of the section switch or the interconnection switch; the remote control module is used for controlling the opening and closing actions of the section switch or the interconnection switch; the synchronous module is used for realizing mutual communication among all feeder devices, so that the on-off state information of the whole main line is sensed.
Furthermore, the CPU module processes the electric quantity analog value collected by the telemetering module, judges whether fault current exists or not, quickly identifies a fault point based on a switch network topological graph and interactive information of the synchronous module, and then controls the opening and closing actions of the section switch or the interconnection switch through the remote control module.
Compared with the prior art, the invention has the beneficial effects that:
1. the intelligent fault isolation method provided by the invention can isolate the fault between the front switch and the rear switch of the fault area without depending on the communication of the main station under the condition that the fault is over-current for a period of zero seconds, thereby minimizing the fault area, recovering the upstream and downstream power supply of the non-fault area through the switch reclosing and the contact switch closing, and maximally improving the distribution network automation level and the power supply reliability.
2. The feeder line terminal devices provided by the invention do not depend on master station communication, carry out information interaction through the synchronization module, and can quickly sense the switch state information of the whole main line based on the switch network topological graph, thereby being beneficial to accurately isolating faults and recovering power supply of non-fault areas, and having higher flexibility and adaptability.
Drawings
Fig. 1 is a topology diagram of a switching network in which a line normally operates according to the present invention.
Fig. 2 is a topological diagram of a switching network when a line fails according to the present invention.
Fig. 3 is a switching network topology diagram for controlling switching on and off by detecting stage by stage of a feeder terminal device when a line has a fault in the invention.
Fig. 4 is a switching network topology diagram of the on-station switch reclosing in case of line fault in the present invention.
Fig. 5 is a switching network topology diagram for recovering power supply upstream and downstream of a fault point in the present invention.
Fig. 6 is a schematic block diagram of a feeder terminal device according to the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details.
Referring to fig. 1 to 5, a method for quickly and intelligently isolating faults in a power distribution network when the power distribution network is overcurrent for a period of zero seconds comprises the following steps:
(1) the main lines are connected with the switch in the station, all sections of the main lines are connected through the section switch, two adjacent main lines are connected through the interconnection switch, the interconnection switch is normally open, and the section switch is normally closed. Specifically, in the present embodiment, the trunk line L1 is connected to the station switch a, the sections of the trunk line L1 are connected to each other by the section switches S1, S2, S3, and S4, the trunk line L2 is connected to the station switch B, the sections of the trunk line L2 are connected to each other by the section switches S5, S6, S7, and S8, the trunk line L1 is connected to the trunk line L2 by the tie switch S0, the tie switch S0 is normally open, and the section switches are normally closed.
(2) Each section switch and each interconnection switch are provided with feeder terminal devices, the switch network topological graph of the main line is recorded into each feeder terminal device, and the feeder terminal devices are mutually communicated and connected. Specifically, the section switches S1 to S8 are provided with feeder terminal devices F1 to F8, respectively, and the interconnection switch S0 is provided with a feeder terminal device F0. Fig. 1 is a topological diagram of a switching network in which a line normally operates.
(3) When a section of the main line has a fault, feeder terminal devices corresponding to the in-station switch and the section switch at the upstream of the section detect fault current, and if the fault current exceeds a set value of an overcurrent section current, the in-station switch and the section switch trip rapidly according to 0S to isolate the fault. As shown in fig. 2, if a fault occurs between the section switches S3 and S4, the feeder terminal devices F1, F2, and F3 will detect the fault current, and if the fault current exceeds the set value of the overcurrent section current, the station switch a, the section switches S3, and S4 trip rapidly at 0S to isolate the fault.
(4) And each feeder line terminal device controls the section switches of the non-fault sections from top to bottom step by step according to the switch network topological graph to start reclosing, quickly identifies fault points, and closes the section switches at two ends of the fault points in an opening and closing mode, so that a fault area is isolated. In the step, if the feeder line terminal device senses that the feeder line terminal device is switched off and the lower-stage section switch is also switched off, the section switch is controlled to start reclosing; if the feeder line terminal device senses self brake-off and the lower stage section switch is switched on, controlling the section switch to start brake-off locking; and if the feeder line terminal device senses self closing and the upper-level section switch is switched off and locked, controlling the section switch to start switching off and locking, thereby isolating the fault point. Specifically, as can be seen from fig. 3 and 4, the feeder terminal device F1 detects that the section switch S1 is opened, and senses that the section switch S2 is opened, then the reclosing is started; the feeder line terminal device F2 detects that the section switch S2 is opened, and senses that the section switch S3 is opened, and then reclosing is started; the feeder line terminal device F3 detects that the section switch S3 is switched off, and senses that the section switch S4 is switched on, and then switching-off locking is started; and the feeder terminal device F4 detects that the section switch S4 is switched on, and senses that the section switch S3 is switched off and the switching-off is locked, and then the switching-off locking is started. The section switches S1 and S2 are quickly reclosed as required, and the section switches S3 and S4 are quickly opened and locked as required, so that fault points are isolated.
(5) And the switch in the station is reclosed within the set reclosing time, and the upstream power supply of the fault point is recovered. Preferably, the set reclosing is 1.5 s. Specifically, as shown in fig. 4, the station switch a is reclosed within 1.5S, so that power is normally supplied between the station switch a and the section switch S3.
(6) And the interconnection switch starts closing and recovers the downstream power supply of the fault point. In the step, the feeder terminal device of the interconnection switch senses the opening and locking of the section switch before and after the fault point, and starts closing to recover the downstream power supply of the fault point under the conditions of opening and single-side pressure. Specifically, as shown in fig. 5, when the feeder terminal device F0 senses that the section switches S3 and S4 at both ends of the fault point are both switched off and are in a state of being switched off and having a voltage on one side, the feeder terminal device controls the interconnection switch to switch on, so that power is normally supplied between the station switch B and the section switch S4.
Referring to fig. 1 to 5, a fault quick intelligent isolation device for an overcurrent of a distribution network for a period of zero seconds comprises the in-station switches a and B and the main lines L1 and L2, wherein the sections of the main line L1 are connected by the section switches S1, S2, S3 and S4, the sections of the main line L2 are connected by the section switches S5, S6, S7 and S8, and the main line L1 and the main line L2 are connected by the tie switch S0. The section switches S1 to S8 are provided with feeder terminal devices F1 to F8, respectively, and the interconnection switch S0 is provided with a feeder terminal device F0. A switching network topological graph of a trunk line is recorded in each feeder line terminal device; each feeder line terminal device senses the switch state information of the whole main line through data interaction and executes the intelligent fault isolation method.
Referring to fig. 6, in particular, the feeder line terminal device includes a CPU module 11, and a telemetry module 12, a telemetry module 13, a remote control module 14, and a synchronization module 15 connected to the CPU module; the telemetry module 12 is used for acquiring an electric quantity analog value on a main line; the remote signaling module 13 is used for acquiring the state of the section switch or the interconnection switch; the remote control module 14 is used for controlling the opening and closing actions of the section switch or the interconnection switch; the synchronization module 15 is used to enable the feeder devices to communicate with each other, so as to sense the switch status information of the whole main line. In practical applications, the synchronization module 15 may adopt a GPRS communication module or other communication modules capable of implementing information interaction. Furthermore, a power supply module 16 is included, the power supply module 16 being configured to supply power to the feeder terminal device.
Referring to fig. 6, the CPU module 11 processes the analog value of the electrical quantity collected by the telemetry module 12, determines whether there is a fault current, and quickly identifies a fault point based on the switching network topology and the interaction information of the synchronization module 15, and then controls the opening and closing operation of the sectionalizing switch or the interconnection switch through the remote control module 14.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (7)
1. A method for quickly and intelligently isolating faults of a power distribution network when the power distribution network is overcurrent for a period of zero seconds is characterized by comprising the following steps: the method comprises the following steps:
(1) the main lines are connected with the switch in the station, all sections of the main lines are connected by the section switch, two adjacent main lines are connected by the interconnection switch, the interconnection switch is normally open, and the section switch is normally closed;
(2) each section switch and each interconnection switch are provided with feeder line terminal devices, a switch network topological graph of the trunk line is recorded into each feeder line terminal device, and the feeder line terminal devices are mutually communicated and connected;
(3) when a section of the main line has a fault, feeder terminal devices corresponding to the in-station switch and the section switch at the upstream of the section detect fault current, if the fault current exceeds a set value of an overcurrent section current, the in-station switch and the section switch trip rapidly according to 0s to isolate the fault;
(4) each feeder line terminal device controls the section switches of the non-fault sections from top to bottom step by step according to a switch network topological graph to start reclosing, quickly identifies fault points, and locks the section switches at two ends of the fault points in an opening and closing mode, so that a fault area is isolated;
(5) reclosing the switch in the station within the set reclosing time, and recovering the upstream power supply of the fault point;
(6) and the interconnection switch starts closing and recovers the downstream power supply of the fault point.
2. The method for intelligently and rapidly isolating faults during a period of zero seconds of overcurrent of a power distribution network according to claim 1, is characterized in that: in the step (4), if the feeder line terminal device senses that the feeder line terminal device is switched off and the lower-stage section switch is also switched off, controlling the section switch to start reclosing; if the feeder line terminal device senses self brake-off and the lower stage section switch is switched on, controlling the section switch to start brake-off locking; and if the feeder line terminal device senses self closing and the upper-level section switch is switched off and locked, controlling the section switch to start switching off and locking, thereby isolating the fault point.
3. The method for intelligently and rapidly isolating faults during a period of zero seconds of overcurrent of a power distribution network according to claim 1, is characterized in that: in the step (6), the feeder terminal device of the interconnection switch senses the opening and locking of the section switch before and after the fault point, and starts closing to recover the downstream power supply of the fault point under the conditions of opening and single-side pressure.
4. The method for intelligently and rapidly isolating faults during a period of zero seconds of overcurrent of a power distribution network according to claim 1, is characterized in that: in step (5), the set reclosing time is 1.5 s.
5. The utility model provides a but distribution network overflows quick intelligent isolation fault device of a section zero second which characterized in that: the station switch comprises an in-station switch, main lines, section switches and interconnection switches, wherein the main lines are connected with the in-station switch, two adjacent main lines are connected through the interconnection switches, and all sections of the main lines are connected through the section switches; each section switch and each interconnection switch are provided with feeder line terminal devices which are in communication connection with each other, and a switch network topological graph of a trunk line is recorded in each feeder line terminal device; each feeder terminal device senses switch state information of the whole main line through data interaction and executes the intelligent fault isolation method according to claim 1.
6. The device of claim 5, wherein the device is capable of intelligently isolating faults rapidly when the power distribution network is overcurrent for a period of zero seconds, and comprises: the feeder line terminal device comprises a CPU module, a telemetry module, a remote signaling module, a remote control module and a synchronization module, wherein the telemetry module, the remote signaling module, the remote control module and the synchronization module are connected with the CPU module; the telemetering module is used for acquiring an electric quantity analog value on a trunk line; the remote signaling module is used for acquiring the state of the section switch or the interconnection switch; the remote control module is used for controlling the opening and closing actions of the section switch or the interconnection switch; the synchronous module is used for realizing mutual communication among all feeder devices, so that the on-off state information of the whole main line is sensed.
7. The device of claim 6, wherein the device is capable of intelligently isolating faults rapidly when the power distribution network is overcurrent for a period of zero seconds, and comprises: the CPU module processes the electric quantity analog value collected by the telemetering module, judges whether fault current exists or not, quickly identifies a fault point based on a switch network topological graph and interactive information of the synchronization module, and then controls the opening and closing actions of the section switch or the interconnection switch through the remote control module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004668.XA CN113629672B (en) | 2021-08-30 | 2021-08-30 | Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111004668.XA CN113629672B (en) | 2021-08-30 | 2021-08-30 | Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network |
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| CN113629672A true CN113629672A (en) | 2021-11-09 |
| CN113629672B CN113629672B (en) | 2023-10-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114256819A (en) * | 2021-12-21 | 2022-03-29 | 青岛鼎信通讯股份有限公司 | Terminal-based self-healing control method for transformer area |
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| CN113258545A (en) * | 2021-04-14 | 2021-08-13 | 珠海许继电气有限公司 | In-situ feeder automation method and system based on multi-stage time step difference protection |
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2021
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