CN114336552A - Feeder terminal-based distribution line fault rapid isolation method - Google Patents
Feeder terminal-based distribution line fault rapid isolation method Download PDFInfo
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- CN114336552A CN114336552A CN202210228288.2A CN202210228288A CN114336552A CN 114336552 A CN114336552 A CN 114336552A CN 202210228288 A CN202210228288 A CN 202210228288A CN 114336552 A CN114336552 A CN 114336552A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to the technical field of medium-voltage power distribution networks, and discloses a distribution line fault rapid isolation method based on a feeder terminal, which comprises the following steps: configuring the address of each feeder terminal on the distribution line; configuring an address of a contact switch for each feeder terminal on the line; each feeder terminal monitors current and voltage data in real time, and if the current and voltage data exceed a preset value, the voltage vector and the current vector of the cycle are sent to the adjacent front and rear feeder terminals; calculating differential current and braking current according to the voltage vector and the current vector; and judging and isolating according to the calculation result. In the invention, when the voltage and current mutation quantity acquired by the feeder line terminal exceeds a set value, vector information is sent to adjacent front and rear feeder line terminals to calculate differential current and braking current, judgment is carried out according to a calculation result, the positioning and the removal of a fault are realized, and then the contact switch is switched on to recover power supply. The method can quickly isolate faults, has stable and reliable results, lower construction and maintenance cost and strong engineering practicability.
Description
Technical Field
The invention relates to the technical field of medium-voltage power distribution networks, in particular to a distribution line fault rapid isolation method based on a feeder terminal.
Background
As the last step of the power system, namely 'generation, transmission, transformation and distribution', the power distribution network is closest to the power utilization end and is an area with the most faults, so that the operation state of the power distribution network is important for the stable operation of the power grid. Because distribution lines total distance is long, degree of automation is low, the structure is complicated, the environment is complicated, leads to the circuit to break down easily, simultaneously because distribution lines directly faces the user, probably directly leads to the user to have a power failure after breaking down. Therefore, it is important to quickly identify and isolate faults and restore non-fault zone power to reduce customer outage time.
At present, domestic fault treatment of distribution lines is mainly divided into 3 types:
1. according to the traditional three-section protection scheme, after a feeder terminal breaks down, operation and maintenance personnel are required to confirm and inform main station workers of closing contact switches to recover power supply of a non-fault area. The method has long power failure time, and manual closing needs to confirm the fault position, isolate the fault section and then perform contact closing operation. For a longer line, the method also has the problems that the protection delay is difficult to set, three-section protection is not selective, the power failure range is easy to expand after a fault occurs, and the like. Meanwhile, the method depends on manpower, which is also contrary to the current trend of power distribution automation.
2. According to the local Feeder Automation (FA) scheme, after a feeder terminal automatically isolates a fault area, a contact switch is controlled to be switched on to recover power supply of a non-fault area. The method does not need manual participation, and can accurately cut off the fault section and recover the power supply of the non-fault section. But the implementation mechanism of this method will result in a long isolation failure time. And the method can switch on the fault area for many times, if a major fault is met, the service life of the breaker can be obviously shortened or the reclosing discharge can be caused to cause the power failure of the whole line, and the power failure range is expanded.
3. By using an intelligent distributed Feeder Automation (FA) scheme of optical fiber communication, a feeder terminal automatically isolates a fault area and then controls a tie switch to be switched on to recover power supply of a non-fault area. Communication between feeder terminals is mainly through optical fibers, which need to be erected along the distribution lines. Therefore, the method has high construction cost and higher later-period optical fiber maintenance cost.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a Feeder Terminal (FTU) -based distribution line fault rapid isolation method, vector information is sent to the adjacent front and rear feeder terminals when the sudden change of voltage and current acquired by the feeder terminal exceeds a set value, differential current and braking current are calculated, judgment is carried out according to the calculation result, fault positioning and removal are realized, and then contact switch closing is carried out to recover power supply.
The purpose of the invention can be realized by the following technical scheme:
a distribution line fault rapid isolation method based on a feeder terminal comprises the following steps:
s1: and configuring the terminal address of each feeder terminal on the distribution line, so that each feeder terminal can communicate with the adjacent front and rear feeder terminals.
S2: and configuring the address of the interconnection switch for each feeder terminal on the distribution line, so that each feeder terminal can communicate with the interconnection switch.
S3: each feeder terminal monitors phase current, phase voltage, zero sequence current and zero sequence voltage in real time, and if any data mutation amount in the phase current, the phase voltage, the zero sequence current and the zero sequence voltage data exceeds a set value, the voltage vector and the current vector of the cycle wave are sent to the adjacent front and rear feeder terminals.
S4: and the feeder terminal which monitors that the line data break variable exceeds the set value respectively calculates the differential current and the braking current in the area between the feeder terminal and the adjacent feed-forward line terminal and the feed-back line terminal according to the voltage vector and the current vector of the feeder terminal and the adjacent feed-forward line terminal and the current vector of the feeder terminal.
S5: respectively judging according to the calculation results in the previous step, if the ratio of the braking current to the differential current is larger than a preset value, judging that a fault occurs in the area, tripping off feeder line terminals at two ends of the area, and entering S6; otherwise, no action is performed.
S6: and switching on the interconnection switch to recover the power supply of the non-fault area.
Further, the communication mode between the feeder terminals in S1 is a carrier wave.
Further, in S2, the communication mode between the feeder terminal and the interconnection switch is carrier.
Further, the set value of the amount of the sudden change in S3 is 5% of the rated value.
The invention has the beneficial effects that: and if the voltage and current mutation quantity acquired by the feeder line terminal exceeds a set value, vector information is sent to the adjacent front and rear feeder line terminals, differential current and braking current are calculated, judgment is carried out according to the calculation result, the fault is positioned and removed, and then the contact switch is switched on to recover power supply.
Compared with the traditional three-section protection scheme, the method is high in speed, can isolate faults in millisecond time, does not need manual participation, and automatically recovers power supply of a non-fault area. The applicability is strong, the result is stable and reliable, and the power failure range cannot be expanded due to overlong lines.
Compared with an on-site feeder automation scheme, the method has the advantages of high fault isolation speed and no problem of multiple switching-on in a fault area.
Compared with an intelligent distributed feeder automation scheme using optical fiber communication, the method uses the distribution line carrier communication, does not need to lay optical fibers independently, and is low in construction and maintenance cost.
Drawings
FIG. 1 is a general flow diagram of the present invention.
Fig. 2 is a topology diagram in embodiment 1 of the present invention.
Fig. 3 is a topology diagram in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1.
With reference to fig. 1, a method for quickly isolating a fault of a distribution line based on a feeder terminal includes the following steps:
s1: in the embodiment, as shown in fig. 2, the terminal addresses of the feeder terminals on the distribution line are configured to be 1, 2, and 3, respectively, so that each feeder terminal can implement carrier communication with its adjacent front and back feeder terminals.
S2: and configuring an address 4 of a connection switch for each feeder terminal on the distribution line, so that each feeder terminal can realize carrier communication with the connection switch.
S3: each feeder terminal monitors phase current, phase voltage, zero sequence current and zero sequence voltage in real time, when the circuit normally runs, the three-phase voltage of the feeder terminal 2 and the three-phase voltage of the feeder terminal 3 are both 5.77kV, and the three-phase current is 100A. If an AB interphase short-circuit fault occurs between the feeder terminal 2 and the feeder terminal 3, the voltage of the feeder terminal 2 becomes 2kV, 2kV and 5.7kV, the current becomes 1000A, 1000A and 100A, the voltage of the feeder terminal 3 becomes 1kV, 1kV and 5.7kV, and the current becomes 10A, 10A and 100A. And (3) the voltage and the current of the feeder terminal 2 and the feeder terminal 3 are suddenly changed, and the sudden change value exceeds 5% of the rated value, and the voltage vector and the current vector of the current cycle are sent to the adjacent front and rear feeder terminals.
S4: calculating the differential current and the braking current of the area between the feeder terminal 2 and the feeder terminal 3 to obtain that the phase difference A is 1100A and the braking current is 495A;
the differential current and the detent current of the area between the feeder terminal 1 and the feeder terminal 2 are calculated and both result to be 0A.
S5: the ratio of the differential current of phase A and the braking current of the area between the feeder terminal 2 and the feeder terminal 3 is about 2.22 and is greater than the preset value of 0.3, and the fault is judged to be in the area between the feeder terminal 2 and the feeder terminal 3, and the two feeder terminals are tripped;
the ratio of the differential current and the braking current of the area between the feeder terminal 1 and the feeder terminal 2 is 0 and is smaller than a preset value of 0.3, and the area is judged to have no fault and not to act.
S6: and the feeder terminal 2 and the feeder terminal 3 inform the interconnection switch 4 to be switched on, and the power supply of the non-fault area is recovered.
Example 2.
With reference to fig. 1, a method for quickly isolating a fault of a distribution line based on a feeder terminal includes the following steps:
s1: in the embodiment, as shown in fig. 3, the terminal addresses of the feeder terminals on the distribution line are configured to be 1, 2, 3, 5, 6, and 7, respectively, so that each feeder terminal can implement carrier communication with its adjacent front and back feeder terminals.
S2: and addresses 4 and 8 of the interconnection switch are configured for each feeder line terminal on the distribution line, so that each feeder line terminal can realize carrier communication with the interconnection switch.
S3: each feeder terminal monitors phase current, phase voltage, zero sequence current and zero sequence voltage in real time, when the circuit normally runs, the three-phase voltage of the feeder terminal 5 and the three-phase voltage of the feeder terminal 6 are both 5.77kV, and the three-phase current is 100A. If a BC interphase short-circuit fault occurs between the feeder terminal 5 and the feeder terminal 6, the voltage of the feeder terminal 5 becomes 2kV, 2kV and 5.7kV, the current becomes 1000A, 1000A and 100A, the voltage of the feeder terminal 6 becomes 1kV, 1kV and 5.7kV, and the current becomes 10A, 10A and 100A. And (3) the voltage and the current of the feeder terminal 5 and the feeder terminal 6 are suddenly changed, and the sudden change value exceeds 5% of the rated value, and the voltage vector and the current vector of the current cycle are sent to the adjacent front and rear feeder terminals.
S4: calculating the differential current and the braking current of the area between the feeder terminal 5 and the feeder terminal 6 to obtain that the phase difference current B is 1100A, and the braking current is 495A;
the differential current and the braking current in the area between the feeder terminal 1, the feeder terminal 2 and the feeder terminal 5 are calculated, and the result is 0A.
S5: the ratio of the phase B phase difference current and the braking current in the area between the feeder terminal 5 and the feeder terminal 6 is about 2.22 and is greater than the preset value of 0.3, the fault is judged to be in the area between the feeder terminal 5 and the feeder terminal 6, and the two feeder terminals are tripped;
the ratio of the differential current and the braking current of the area among the feeder terminal 1, the feeder terminal 2 and the feeder terminal 5 is 0 and is less than a preset value of 0.3, and the area is judged to have no fault and not to act.
S6: and the feeder line terminal 5 and the feeder line terminal 6 inform the interconnection switch 8 of switching on, and the power supply of the non-fault area is recovered.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (4)
1. A distribution line fault rapid isolation method based on a feeder terminal is characterized by comprising the following steps:
s1: configuring the terminal address of each feeder terminal on the distribution line, so that each feeder terminal can communicate with the adjacent front and rear feeder terminals;
s2: configuring the address of a tie switch for each feeder terminal on the distribution line, so that each feeder terminal can communicate with the tie switch;
s3: each feeder line terminal monitors phase current, phase voltage, zero sequence current and zero sequence voltage in real time, and if any data mutation amount in the phase current, the phase voltage, the zero sequence current and the zero sequence voltage data exceeds a set value, the voltage vector and the current vector of the cycle wave are sent to the adjacent front and rear feeder line terminals;
s4: the feeder line terminal which monitors that the sudden change of the line data exceeds the set value respectively calculates the differential current and the braking current of the area between the feeder line terminal and the adjacent feed-forward line terminal and the adjacent feed-back line terminal according to the voltage vector and the current vector of the feeder line terminal and the adjacent feed-forward line terminal and the current vector of the feeder line terminal;
s5: respectively judging according to the calculation results in the previous step, if the ratio of the braking current to the differential current is larger than a preset value, judging that a fault occurs in the area, tripping off feeder line terminals at two ends of the area, and entering S6; otherwise, no action is executed;
s6: and switching on the interconnection switch to recover the power supply of the non-fault area.
2. The feeder terminal-based distribution line fault rapid isolation method as claimed in claim 1, wherein the communication mode between the feeder terminals in S1 is carrier.
3. The feeder terminal-based distribution line fault rapid isolation method as claimed in claim 1, wherein the communication mode between the feeder terminal and the tie switch in S2 is carrier.
4. The feeder-terminal-based distribution line fault rapid isolation method as claimed in claim 1, wherein the set value of the break variable in S3 is 5% of the rated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210228288.2A CN114336552A (en) | 2022-03-10 | 2022-03-10 | Feeder terminal-based distribution line fault rapid isolation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210228288.2A CN114336552A (en) | 2022-03-10 | 2022-03-10 | Feeder terminal-based distribution line fault rapid isolation method |
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| CN114336552A true CN114336552A (en) | 2022-04-12 |
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| CN202210228288.2A Withdrawn CN114336552A (en) | 2022-03-10 | 2022-03-10 | Feeder terminal-based distribution line fault rapid isolation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808590A (en) * | 2022-11-25 | 2023-03-17 | 国网江苏省电力有限公司南通供电分公司 | Power distribution network fault detection processing method based on feeder line information analysis |
Citations (5)
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| JP2000139025A (en) * | 1998-10-30 | 2000-05-16 | Mitsubishi Electric Corp | Device and method for controlling power distribution |
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| CN107809105A (en) * | 2017-06-08 | 2018-03-16 | 国网新疆电力公司经济技术研究院 | Feeder line sectionalised protection system based on Zigbee network communication |
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2022
- 2022-03-10 CN CN202210228288.2A patent/CN114336552A/en not_active Withdrawn
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| JP2000139025A (en) * | 1998-10-30 | 2000-05-16 | Mitsubishi Electric Corp | Device and method for controlling power distribution |
| CN103354353A (en) * | 2013-06-24 | 2013-10-16 | 国家电网公司 | Intelligent power-distribution-network whole-line quick-reacting main protection and determination system and method |
| CN105024361A (en) * | 2015-04-16 | 2015-11-04 | 扬州科宇电力有限公司 | On-site feeder automatic protection method and application thereof |
| CN107809105A (en) * | 2017-06-08 | 2018-03-16 | 国网新疆电力公司经济技术研究院 | Feeder line sectionalised protection system based on Zigbee network communication |
| CN212518535U (en) * | 2020-03-18 | 2021-02-09 | 南京南瑞继保电气有限公司 | Power distribution terminal and power distribution protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808590A (en) * | 2022-11-25 | 2023-03-17 | 国网江苏省电力有限公司南通供电分公司 | Power distribution network fault detection processing method based on feeder line information analysis |
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