CN113629672B - Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network - Google Patents
Method and device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of power distribution network Download PDFInfo
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- CN113629672B CN113629672B CN202111004668.XA CN202111004668A CN113629672B CN 113629672 B CN113629672 B CN 113629672B CN 202111004668 A CN202111004668 A CN 202111004668A CN 113629672 B CN113629672 B CN 113629672B
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- switch
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- terminal device
- feeder terminal
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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
-
- 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
-
- 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
Abstract
The invention discloses a method for rapidly and intelligently isolating faults when a section of a main line breaks down, wherein a feeder terminal device corresponding to a station switch and a sectionalizing switch at the upstream of the section detects fault current, and if the fault current exceeds a set value of a section of overcurrent, the station switch and the sectionalizing switch rapidly trip according to 0 s; each feeder line terminal device controls the sectional switches of the non-fault section from top to bottom step by step according to the switch network topological graph to start reclosing, quickly identifies fault points, and opens and locks the sectional switches at two ends of the fault points so as to isolate fault areas; reclosing the switch in the station within the set reclosing time, and recovering power supply at the upstream of the fault point; the contact switch starts to close, and power supply at the downstream of the fault point is recovered. The invention can isolate faults between the front switch and the rear switch of the fault area, thereby minimizing the fault area, recovering the power supply of the upstream and the downstream of the non-fault area in time, and maximally improving the automation level and the power supply reliability of the distribution network.
Description
Technical Field
The invention relates to feeder automation of a power distribution network, in particular to a method and a device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of the power distribution network.
Background
The three-section type current protection is to set different delay action time under different overcurrent values to avoid work peak current, so that when a short circuit fault occurs in a circuit, only a breaker with the nearest accident point acts to reduce the influence range of power failure. When the overcurrent period in the station is set to be 0S protection, the short-circuit fault current of the circuit exceeds a fixed value of the overcurrent period, so that the switch in the station trips to cause the full-line power failure, the fault cannot be isolated quickly and effectively, and the power supply can be recovered after the repair must be checked. The long-time power failure brings great economic loss and great influence on the power supply reliability and the service satisfaction. Therefore, the method for rapidly and intelligently isolating faults in the power distribution network after the power distribution network overflows for a period of zero seconds is provided.
Disclosure of Invention
The invention provides a method and a device for rapidly and intelligently isolating faults during one-section zero-second overcurrent of a power distribution network, and mainly aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
a method for rapidly and intelligently isolating faults during one-section zero-second overcurrent of a power distribution network comprises the following steps:
(1) The main lines are connected with the in-station switches, the sections of the main lines are connected by the sectionalizing switches, the adjacent two main lines are connected by the interconnecting switches, and the interconnecting switches are normally open and the sectionalizing switches are normally closed;
(2) Each sectionalizer and each interconnection switch are provided with a feeder terminal device, a switch network topological graph of a main line is recorded into each feeder terminal device, and the feeder terminal devices are mutually connected in a communication way;
(3) When a certain section of the main line breaks down, a feeder terminal device corresponding to a station switch and a sectionalizing switch at the upstream of the section detects fault current, and if the fault current exceeds a set value of an overcurrent section of current, the station switch and the sectionalizing switch trip rapidly according to 0s to isolate the fault;
(4) Each feeder line terminal device controls the sectional switches of the non-fault section from top to bottom step by step according to the switch network topological graph to start reclosing, quickly identifies fault points, and opens and locks the sectional switches at two ends of the fault points so as to isolate fault areas;
(5) Reclosing the switch in the station within the set reclosing time, and recovering power supply at the upstream of the fault point;
(6) The contact switch starts to close, and power supply at the downstream of the fault point is recovered.
Further, if the feeder terminal device senses that the feeder terminal device is self-opening and the lower-stage dividing switch is also opening, the dividing switch is controlled to start reclosing; if the feeder terminal device senses self-opening and the lower-stage dividing switch is closed, controlling the dividing switch to start opening and closing; if the feeder terminal device senses self-closing and the upper-level sectionalizing switch is opened and closed, the sectionalizing switch is controlled to start opening and closing, so that a fault point is isolated.
In step (6), the feeder terminal device of the tie switch senses that the sectionalizing switch is closed before and after the fault point, and starts closing to recover the power supply at the downstream of the fault point when the sectionalizing switch is positioned and one side is pressed.
Further, in step (5), the reclosing time is set to 1.5s.
The utility model provides a distribution network overflows one section zero seconds and can intelligent isolation trouble device fast, includes station internal switch, trunk line, sectionalizer and tie switch, and the trunk line is connected in the station internal switch, connects through tie switch between two adjacent trunk lines, and each section of trunk line is connected through sectionalizer; each sectionalizing switch and each interconnecting switch are provided with feeder terminal devices which are in communication connection with each other, and each feeder terminal device is recorded with a switch network topological graph of a main line; each feeder terminal device senses the switch state information of the whole main line through data interaction and executes the intelligent fault isolation method.
Further, the feeder terminal device comprises a CPU module, a telemetry module, a remote control module and a synchronization module which are connected with the CPU module; the remote measuring module is used for collecting an electric quantity analog value on a main line; the remote signaling module is used for collecting the states of the sectionalizing switch or the interconnecting switch; the remote control module is used for controlling the opening and closing actions of the sectionalizing switch or the interconnecting switch; the synchronization module is used for enabling all feeder devices to communicate with each other, so that the switching state information of the whole trunk line is perceived.
Furthermore, the CPU module processes the electric quantity analog value collected by the remote measuring module, judges whether fault current exists or not, rapidly identifies fault points based on the interaction information of the switch network topological graph and the synchronous module, and further controls the opening and closing actions of the sectionalizing switch or the interconnecting switch through the remote control module.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the intelligent fault isolation method provided by the invention, the fault can be isolated between the front switch and the rear switch of the fault area without depending on communication of the main station under the condition of one period of zero second overcurrent, so that the fault area is minimized, upstream and downstream power supply of the non-fault area is recovered through switch reclosing and contact switch closing, and the distribution network automation level and the power supply reliability are improved maximally.
2. The feeder terminal devices provided by the invention do not depend on master station communication, perform information interaction through the synchronization module, quickly sense the switch state information of the whole main line based on the switch network topology diagram, be favorable for accurately isolating faults, recover power supply in a non-fault area and have higher flexibility and adaptability.
Drawings
Fig. 1 is a topology diagram of a switching network for normal operation of a circuit in the present invention.
Fig. 2 is a topology of a switching network in the event of a circuit failure in accordance with the present invention.
Fig. 3 is a topology diagram of a switching network in which a feeder terminal device detects and controls opening and closing in stages when a line fails in the present invention.
Fig. 4 is a topology diagram of a switching network for reclosing a switch in a station when a line fails in the present invention.
Fig. 5 is a topology diagram of a switching network for recovering power 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
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent to one skilled in the art that the present invention may be practiced without these details.
Referring to fig. 1 to 5, a method for rapidly and intelligently isolating faults during power distribution network overcurrent for a period of zero seconds comprises the following steps:
(1) The main lines are connected with the in-station switches, the sections of the main lines are connected by the sectionalizing switches, the adjacent two main lines are connected by the interconnecting switches, and the interconnecting switches are normally open and the sectionalizing switches are normally closed. Specifically, in this embodiment, the trunk line L1 is connected to the intra-station switch a, the sections of the trunk line L1 are connected by the sectionalizing switches S1, S2, S3 and S4, the trunk line L2 is connected to the intra-station switch B, the sections of the trunk line L2 are connected by the sectionalizing switches S5, S6, S7 and S8, the trunk line L1 and the trunk line L2 are connected by the tie switch S0, the tie switch S0 is normally open, and the sectionalizing switches are normally closed.
(2) Each sectionalizer and each interconnection switch are provided with feeder terminal devices, and a switching network topology diagram of the main line is recorded into each feeder terminal device and the feeder terminal devices are connected in a communication manner. Specifically, the sectionalizing switches S1-S8 are provided with feeder terminal devices F1-F8, respectively, and the tie switch S0 is provided with a feeder terminal device F0. Fig. 1 is a switching network topology diagram for normal operation of a line.
(3) When a certain section of the main line breaks down, the feeder terminal device corresponding to the station switch and the sectionalizer at the upstream of the section detects fault current, and if the fault current exceeds a set value of a section of overcurrent, the station switch and the sectionalizer trip rapidly according to 0S to isolate the fault. As shown in fig. 2, if a fault occurs between the segment switches S3 and S4, the feeder terminal devices F1, F2 and F3 will detect a fault current, and if the fault current exceeds a set value of an overcurrent, the in-station switch a and the segment switches S3 and S4 trip rapidly for 0S to isolate the fault.
(4) And each feeder line terminal device controls the sectional switches of the non-fault section from top to bottom step by step according to the switch network topology diagram to start reclosing, quickly identifies fault points, and opens and closes the sectional switches at two ends of the fault points, thereby isolating the fault area. In the step, if the feeder terminal device senses self-opening and the lower-stage sectionalizing switch is also opened, the sectionalizing switch is controlled to start reclosing; if the feeder terminal device senses self-opening and the lower-stage dividing switch is closed, controlling the dividing switch to start opening and closing; if the feeder terminal device senses self-closing and the upper-level sectionalizing switch is opened and closed, the sectionalizing switch is controlled to start opening and closing, so that a fault point is isolated. Specifically, referring to fig. 3 and 4, it can be seen that the feeder terminal device F1 detects that the segment switch S1 is opened, and senses that the segment switch S2 is opened, then starts reclosing; the feeder terminal device F2 detects that the sectionalizing switch S2 is opened, and starts reclosing when perceiving that the sectionalizing switch S3 is opened; the feeder terminal device F3 detects that the sectionalizing switch S3 is opened, and starts opening and closing when sensing that the sectionalizing switch S4 is closed; the feeder terminal device F4 detects that the sectional switch S4 is closed, and the sectional switch S3 is opened and closed, and then the opening and closing are started. The sectional switches S1 and S2 are rapidly reclosed as required, and the sectional switches S3 and S4 are rapidly opened and locked as required, so that fault points are isolated.
(5) And reclosing the switch in the station within the set reclosing time, and recovering the power supply at the upstream of the fault point. Preferably, the reclosing is set to 1.5s. Specifically, as shown in fig. 4, the in-station switch a recloses within 1.5S, so that power is normally supplied between the in-station switch a to the segment switch S3.
(6) The contact switch starts to close, and power supply at the downstream of the fault point is recovered. In the step, the feeder terminal device of the tie switch senses that the sectionalizing switch is closed before and after the fault point, and starts closing to recover power supply at the downstream of the fault point when the sectionalizing switch is positioned at the sectionalizing position and is under single-side pressure. Specifically, as shown in fig. 5, the feeder terminal device F0 senses that the sectional switches S3 and S4 at two ends of the fault point are equally switched and blocked, and if the feeder terminal device F0 is in the condition of being split and having pressure on one side, the interconnecting switch is controlled to start switching on, so that power is normally supplied between the in-station switch B and the sectional switch S4.
Referring to fig. 1 to 5, an apparatus for rapidly and intelligently isolating faults in a power distribution network during zero-second overcurrent comprises in-station switches a and B and main lines L1 and L2 as described above, wherein the sections of the main line L1 are connected by sectionalizing switches S1, S2, S3 and S4, the sections of the main line L2 are connected by sectionalizing switches S5, S6, S7 and S8, and the main line L1 and the main line L2 are connected by a connecting switch S0. The sectionalizing switches S1-S8 are provided with feeder terminal devices F1-F8, respectively, and the tie switch S0 is provided with a feeder terminal device F0. A switching network topology diagram of a main line is recorded in each feeder terminal device; each feeder 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 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 collecting an electric quantity analog value on a main line; the remote signaling module 13 is used for collecting the states of the sectionalizing switch or the interconnecting switch; the remote control module 14 is used for controlling the opening and closing actions of the sectionalizer or the tie switch; the synchronization module 15 is configured to enable the feeder devices to communicate with each other, so as to sense switching status information of the entire main line. In practical applications, the synchronization module 15 may be a GPRS communication module or other communication modules capable of implementing information interaction. Further, a power supply module 16 is included, the power supply module 16 being adapted to supply power to the feeder terminal device.
Referring to fig. 6, the cpu module 11 processes the electrical analog value collected by the telemetry module 12, determines whether a fault current occurs, and rapidly identifies a fault point based on the interaction information of the switching network topology diagram and the synchronization module 15, so as to control the opening and closing actions of the sectionalizing switch or the interconnecting switch through the remote control module 14.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (5)
1. A method for rapidly and intelligently isolating faults during one-section zero-second overcurrent of a power distribution network is characterized by comprising the following steps of: the method comprises the following steps:
(1) The main lines are connected with the in-station switches, the sections of the main lines are connected by the sectionalizing switches, the adjacent two main lines are connected by the interconnecting switches, and the interconnecting switches are normally open and the sectionalizing switches are normally closed;
(2) Each sectionalizer and each interconnection switch are provided with a feeder terminal device, a switch network topological graph of a main line is recorded into each feeder terminal device, and the feeder terminal devices are mutually connected in a communication way;
(3) When a certain section of the main line breaks down, a feeder terminal device corresponding to a station switch and a sectionalizing switch at the upstream of the section detects fault current, and if the fault current exceeds a set value of an overcurrent section of current, the station switch and the sectionalizing switch trip rapidly according to 0s to isolate the fault;
(4) Each feeder line terminal device controls the sectional switches of the non-fault section from top to bottom step by step according to the switch network topological graph to start reclosing, quickly identifies fault points, and opens and locks the sectional switches at two ends of the fault points so as to isolate fault areas; in the step, if the feeder terminal device senses that the feeder terminal device is self-opening and the lower-stage sectionalizing switch is also opening, the sectionalizing switch is controlled to start reclosing; if the feeder terminal device senses self-opening and the lower-stage dividing switch is closed, controlling the dividing switch to start opening and closing; if the feeder terminal device senses self closing and the upper level sectionalizing switch is opened and closed, the sectionalizing switch is controlled to start opening and closing so as to isolate a fault point;
(5) Reclosing the switch in the station within the set reclosing time, and recovering power supply at the upstream of the fault point;
(6) The contact switch starts to close, and power supply at the downstream of the fault point is recovered; in the step, the feeder terminal device of the tie switch senses that the sectionalizing switch is closed before and after the fault point, and starts closing to recover power supply at the downstream of the fault point when the sectionalizing switch is positioned at the sectionalizing position and under the condition of single-side pressure.
2. The method for rapidly and intelligently isolating faults in a power distribution network after a period of zero seconds of overcurrent is characterized in that: in step (5), the reclosing time is set to 1.5s.
3. The utility model provides a but distribution network overflows one section zero seconds quick intelligent isolation trouble device which characterized in that: the system comprises an in-station switch, a trunk line, a sectionalizing switch and a tie switch, wherein the trunk line is connected with the in-station switch, two adjacent trunk lines are connected through the tie switch, and each section of the trunk line is connected through the sectionalizing switch; each sectionalizing switch and each interconnecting switch are provided with feeder terminal devices which are in communication connection with each other, and each feeder terminal device is recorded with a switch network topological graph of a main line; each feeder terminal device senses the switch state information of the whole main line through data interaction and executes the intelligent fault isolation method as claimed in claim 1.
4. A power distribution network overcurrent one-section zero-second fast intelligent fault isolation device as claimed in claim 3, wherein: the feeder terminal device comprises a CPU module, a telemetry module, a remote control module and a synchronization module which are connected with the CPU module; the remote measuring module is used for collecting an electric quantity analog value on a main line; the remote signaling module is used for collecting the states of the sectionalizing switch or the interconnecting switch; the remote control module is used for controlling the opening and closing actions of the sectionalizing switch or the interconnecting switch; the synchronization module is used for enabling all feeder devices to communicate with each other, so that the switching state information of the whole trunk line is perceived.
5. The power distribution network overcurrent one-section zero-second rapid intelligent fault isolation device as set forth in claim 4, wherein: the CPU module processes the electric quantity analog value acquired by the remote sensing module, judges whether fault current occurs, rapidly identifies fault points based on the interaction information of the switch network topological graph and the synchronization module, and further controls the opening and closing actions of the sectionalizing switch or the interconnecting 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 |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN113629672A CN113629672A (en) | 2021-11-09 |
| CN113629672B true CN113629672B (en) | 2023-10-10 |
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| CN114256819B (en) * | 2021-12-21 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Terminal-based self-healing control method for platform area |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767182A (en) * | 2015-01-20 | 2015-07-08 | 国家电网公司 | Fault processing method for overhead line type power distribution network |
| CN105896729A (en) * | 2016-03-30 | 2016-08-24 | 南京大全自动化科技有限公司 | Power distribution network based on FTUs and method for diagnosing and isolating faults |
| CN111525525A (en) * | 2020-06-05 | 2020-08-11 | 国网山东省电力公司电力科学研究院 | Method and equipment for recovering power supply of downstream non-fault section with ground fault |
| 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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- 2021-08-30 CN CN202111004668.XA patent/CN113629672B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767182A (en) * | 2015-01-20 | 2015-07-08 | 国家电网公司 | Fault processing method for overhead line type power distribution network |
| CN105896729A (en) * | 2016-03-30 | 2016-08-24 | 南京大全自动化科技有限公司 | Power distribution network based on FTUs and method for diagnosing and isolating faults |
| CN111525525A (en) * | 2020-06-05 | 2020-08-11 | 国网山东省电力公司电力科学研究院 | Method and equipment for recovering power supply of downstream non-fault section with ground fault |
| 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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