CN113690834A - Overlapping type feeder automation line short circuit fault interval detection system on spot - Google Patents

Overlapping type feeder automation line short circuit fault interval detection system on spot Download PDF

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Publication number
CN113690834A
CN113690834A CN202110795277.8A CN202110795277A CN113690834A CN 113690834 A CN113690834 A CN 113690834A CN 202110795277 A CN202110795277 A CN 202110795277A CN 113690834 A CN113690834 A CN 113690834A
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power
distribution
power distribution
switch
automation
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CN202110795277.8A
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Inventor
李克文
陈千懿
欧世锋
陈绍南
李欣桐
黄伟翔
俞小勇
喻磊
齐鹏辉
况成忠
陶中云
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Priority to CN202110795277.8A priority Critical patent/CN113690834A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • 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
    • Y04S10/16—Electric power substations
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

Abstract

The invention provides a detection system for a short-circuit fault section of an on-site reclosing type feeder automation line, which comprises a power distribution main station, a transformer substation outgoing line breaker, a plurality of power distribution automation switches and power distribution terminals, wherein the power distribution automation switches and the power distribution terminals are arranged on a power transmission line; the transformer substation outgoing line breaker is connected with the power distribution main station through optical fibers; the power distribution supplies power to the power distribution terminal after passing through the substation circuit breaker and the plurality of power distribution automatic switches; after a short-circuit fault occurs, switching on a substation outgoing breaker, and calculating a time difference delta t between tripping and switching on of the substation outgoing breaker by a distribution automation master station; the distribution main station calculates the slave first power distribution automation switch power-on delay switch-on time limit according to the power distribution terminalThe total time T from the power on of the distribution automation switch to the closing of the nth distribution automation switchnAnd determining a short-circuit fault area according to the interval in which the delta t falls. Compared with the prior art, the method is simpler and has stronger adaptability.

Description

Overlapping type feeder automation line short circuit fault interval detection system on spot
Technical Field
The invention relates to the technical field of power grid line fault detection, in particular to a system for detecting a short-circuit fault section of an on-site reclosing type feeder automation line.
Background
At present, after a short-circuit fault occurs in an on-site reclosing type feeder automation line, on-site identification and isolation of the line fault and recovery power supply of a non-fault line section are realized mainly through logic cooperation between a substation outgoing line breaker and a distribution automation switch on the line. A distribution automation main station (hereinafter referred to as a distribution main station) generally determines a line short-circuit fault section according to fault current information, switch opening and closing information, and switch locking information sent from a distribution terminal.
The power distribution terminal under the in-situ coincident feeder automation mostly adopts a wireless communication mode to carry out information interaction with a power distribution master station; because communication state is unstable, after the circuit breaks down, the condition that the fault handling information that the distribution terminal sent was missed to send occasionally, missend, not send even, under this scene, the distribution main website can't carry out the automatic identification of trouble interval to type on the spot feeder automation circuit according to the fault information that the distribution terminal sent, and then influences the quick processing of follow-up distribution personnel of salvageing to the circuit trouble. Information for fault processing in the substation is mostly transmitted to a power distribution main station in reliable communication modes such as optical fibers.
In view of this, there is a need to improve the method for the distribution main station to determine the line short-circuit fault section, and use other reliable information to perform the determination and verification of the fault section.
Disclosure of Invention
The invention aims to provide a system for detecting a short-circuit fault section of an in-situ reclosing type feeder automation line, which can solve the problem that the automatic identification of the fault section of the in-situ feeder automation line cannot be carried out due to unstable communication state in the prior art.
The purpose of the invention is realized by the following technical scheme:
a detection system for a short-circuit fault section of an on-site reclosing type feeder automation line comprises a power distribution main station, a transformer substation outgoing line breaker, a plurality of power distribution automation switches and power distribution terminals, wherein the power distribution automation switches and the power distribution terminals are arranged on a power transmission line; the substation outgoing line breaker is connected with the distribution main station through optical fibers; the power distribution supplies power to the power distribution terminal after passing through the substation circuit breaker and the plurality of power distribution automatic switches; after a short-circuit fault occurs, switching on the substation outgoing line breaker and sending switching-on and tripping information to the distribution main station, wherein the distribution main station calculates the time difference delta t between tripping and switching-on of the substation outgoing line breaker; the power distribution master station calculates the total time T from the power acquisition of the 1 st power distribution automatic switch to the switching-on of the nth power distribution automatic switch according to the power acquisition delay switching-on time limit of each power distribution automatic switch set by the power distribution terminalnAnd according to the interval [ T ] in which Δ T fallsn，Tn+1]And determining a short-circuit fault area.
Further, the power distribution main station comprises an information acquisition unit, a first calculation unit, a storage unit, a second calculation unit, an interval judgment unit, an analysis unit and a result output unit, wherein:
the information acquisition unit is used for acquiring switching-on and tripping information sent by the outgoing line breaker of the transformer substation and acquiring a switching-on time point and a tripping time point of the outgoing line breaker of the transformer substation;
the first calculating unit is used for calculating the time difference delta t between the tripping time point and the closing time point of the outgoing line breaker of the transformer substation;
the storage unit is used for storing the power-on delay switching-on time limit of each power distribution automatic switch set by the power distribution terminal;
the second calculating unit is used for calculating the total time T from the power-on of the 1 st distribution automatic switch to the switching-on of the nth distribution automatic switch according to the power-on delay switching-on time limit of each distribution automatic switchn；
Section determination means for determining a section [ T ] in which the time difference [ Δ T ] fallsn，Tn+1]；
The analysis unit is used for obtaining a short-circuit fault section according to the section judged by the section judgment unit;
and the result output unit is used for outputting the short-circuit fault section.
Furthermore, the distribution main station further comprises a correction unit for correcting the power-on delay switching-on time limit of the distribution automation switch stored in the storage unit.
Further, the correcting comprises: obtaining the power-on delay switching-on time limit X of the distribution automation switch according to the test at regular or irregular intervalsn' additionally correcting the power-on delay closing time limit X of each distribution automation switch stored in the storage unitn＝Xn′。
Further, the total time T from the power-on of the 1 st distribution automation switch to the closing of the nth distribution automation switchnThe calculation formula of (2) is as follows:
Figure BDA0003162492820000031
wherein XnAnd Y represents the X time limit of other distribution automation switches which are subjected to power-on and switch-on in the power-on timing process of the nth distribution automation switch.
The detection system for the on-site reclosing type feeder automation circuit short-circuit fault section carries out fault judgment according to the opening and closing action information of the outgoing line breaker of the transformer substation and the closing delay information of the distribution automation switch on the circuit arranged on the distribution terminal, and has no requirement on whether the information sent on the distribution terminal on the circuit is correct or not. Compared with the existing method for judging the fault section by highly depending on the fault information (such as overcurrent information, switch locking information, switch opening and closing information and the like) sent by the power distribution terminal, the system is simpler and has stronger adaptability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the operation of a distribution main station verification in-situ coincidence feeder of the present invention;
FIG. 2 is a block diagram of an in-situ reclosing feeder automation line short fault interval detection system of the present invention;
fig. 3 is a block diagram of a power distribution master station of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The on-site reclosing type feeder automation line short-circuit fault interval detection system comprises a distribution main station, a substation outgoing line breaker, a plurality of distribution automation switches and distribution terminals, wherein the distribution automation switches and the distribution terminals are arranged on a power transmission line, and the distribution automation switches are connected with the distribution terminals. The outgoing line circuit breaker of the transformer substation is connected with a power distribution main station through optical fibers and transmits data, and power is supplied to a power distribution terminal after passing through the circuit breaker of the transformer substation and a plurality of power distribution automatic switches. And after the short-circuit fault occurs, switching on the outgoing breaker of the transformer substation and sending switching-on and tripping information to the power distribution main station, and calculating the time difference delta t between tripping and switching-on of the outgoing breaker of the transformer substation by the power distribution automation main station. The power distribution master station calculates the total time T from power obtaining of the first power distribution automatic switch to switching on of the nth power distribution automatic switch according to the power obtaining delay switching-on time limit of each power distribution automatic switch set by the power distribution terminalnAnd according to the interval [ T ] in which Δ T fallsn，Tn+1]And determining a short-circuit fault area.
The closing and tripping information at least comprises closing time points and tripping time points.
In fig. 1, CB1 is a substation outgoing line breaker; the S1, S2, S3, S4 and the like are distribution automation switches on the power transmission line; F1-F5 indicate that the line section has short-circuit fault. In the on-site reclosing type feeder automation line, when a short-circuit fault occurs, the outgoing line breaker of a transformer substation and the distribution automation switch on the line are disconnected. At this time, in order to verify the short-circuit fault point, the substation outgoing line breaker needs to be switched on, and the time point T of switching-on is recordedA. Reclosing the outgoing line breaker of the transformer substation after short-circuit fault, and closing the distribution automatic switch on the line step by step until the short-circuit fault point causes the outgoing line breaker of the transformer substation to trip again, and recording the time point T of the secondary tripB. The time difference Δ t is calculated as: Δ T ═ TB-TA。
Numbering distribution automation switches according to the connection sequence with the outgoing line circuit breaker of the transformer substationThe distribution automation switch directly and electrically connected with the substation outgoing line breaker physically is marked as a first distribution automation switch, the distribution automation switch physically and electrically connected with the first distribution automation switch is marked as a second distribution automation switch, and so on until the nth distribution automation switch. The former distribution automation switch is switched on, and the latter distribution automation switch is electrified, and the time delay in the period is extremely short, so that the time delay is ignored. For example, the closing time of the substation outlet breaker is considered as the power-on time of the first distribution automation switch. The time interval from the power-on to the switching-on of the nth distribution automatic switch is recorded as the power-on delay switching-on time limit X of the distribution automatic switchn. The power-on delay closing time limit of each distribution automation switch can be known in advance through tests. The total time T from the power on of the first distribution automation switch to the switch-on of the nth distribution automation switchnThe total time limit of the power-on delay switching-on of the first n distribution automation switches is expressed by a formula as follows:
Figure BDA0003162492820000051
wherein: n denotes the number of the distribution automation switch, XnAnd Y represents the X time limit of other distribution automation switches which are subjected to power-on and switch-on in the power-on timing process of the nth distribution automation switch.
When n is equal to 1, the short-circuit fault point is between the substation outgoing line breaker and the 1 st distribution automation switch.
Further, the power distribution main station comprises an information acquisition unit, a first calculation unit, a storage unit, a second calculation unit, an interval judgment unit, an analysis unit and a result output unit, wherein:
and the information acquisition unit is used for acquiring switching-on and tripping information sent by the outgoing line breaker of the transformer substation and acquiring the switching-on time point and the tripping time point of the outgoing line breaker of the transformer substation.
The first calculating unit is used for calculating the time difference delta t between the tripping time point and the closing time point of the substation outgoing line breaker.
And the storage unit is used for storing the power-on delay switching-on time limit of each power distribution automatic switch set by the power distribution terminal.
The second calculating unit calculates the total time T from the power-on of the first distribution automatic switch to the switching-on of the nth distribution automatic switch according to the power-on delay switching-on time limit of each distribution automatic switchn。
Section determination means for determining a section [ T ] in which the time difference [ Δ T ] fallsn，Tn+1]。
And the analysis unit is used for obtaining the short-circuit fault section according to the section judged by the section judgment unit.
And the result output unit is used for outputting the short-circuit fault section.
If the interval [ T ] into which Δ T fallsn，Tn+1]And judging that the short-circuit fault point is between the nth distribution automatic switch and the (n + 1) th distribution automatic switch. When n is equal to 0, the short-circuit fault point is between the substation outgoing line breaker and the 1 st distribution automation switch. When the nth distribution automation switch is the end switch of the main line or the branch line, Tn+1Treatment is + ∞, i.e. the interval in which Δ T falls is [ T ]n，+∞]And judging that the short-circuit fault point is behind the nth distribution automation switch.
Preferably, the distribution main station further comprises a correction unit for correcting the power-on delay switching-on time limit of the distribution automation switch stored in the storage unit. Obtaining the power-on delay switching-on time limit X of the distribution automation switch according to the test at regular or irregular intervalsn' additionally correcting the power-on delay closing time limit X of each distribution automation switch stored in the storage unitn＝Xn′。
The specific process of correction is as follows: recording the power-on time point T of the nth distribution automation switchn1And recording the closing time point T after the distribution automation switch is powered onn2Calculating the time interval X from power-on to switch-on of the distribution automation switchn', order Xn＝Xn′。
Xn' is formulated as:
Xn′＝Tn2-Tn1。
power-on delay closing time limit XnThe purpose of performing the correction is: xnThe electronic equipment is obtained and stored for standby in advance according to tests or tests, but the performance of the electronic equipment can be changed after the electronic equipment is used for a long time due to the service life of the electronic equipment or external reasons, and the value of the power-on delay closing time limit of the electronic equipment can also be changed. If the correction is not performed, there is a deviation between the stored data and the actual value, and the interval [ T ] in which the Δ T is judged to fall isn，Tn+1]A deviation is generated in time, thereby causing inaccurate judgment of the short-circuit fault point.
In the invention, the distribution automation switch can adopt a load switch or a breaker, the distribution automation switch, the substation outgoing line breaker and the distribution main station can adopt a wireless network or optical fiber communication mode, and the communication protocol adopts a DL/T634.5101-2002 balanced protocol or a DL/T634.5104-2002 protocol.
In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.

Claims (5)

1. A detection system for a short-circuit fault section of an on-site reclosing type feeder automation line is characterized by comprising a power distribution main station, a transformer substation outgoing line breaker, a plurality of power distribution automation switches and power distribution terminals, wherein the power distribution automation switches and the power distribution terminals are arranged on a power transmission line; the substation outgoing line breaker is connected with the distribution main station through optical fibers; the power distribution supplies power to the power distribution terminal after passing through the substation circuit breaker and the plurality of power distribution automatic switches; after a short-circuit fault occurs, switching on the substation outgoing line breaker and sending switching-on and tripping information to the distribution main station, wherein the distribution main station calculates the time difference delta t between tripping and switching-on of the substation outgoing line breaker; the power distribution master station calculates the total time T from power obtaining of the first power distribution automatic switch to switching on of the nth power distribution automatic switch according to the power obtaining delay switching-on time limit of each power distribution automatic switch set by the power distribution terminalnAnd according to the interval [ T ] in which Δ T fallsn，Tn+1]And determining a short-circuit fault area.
2. The in-situ overlapping type feeder automation line short-circuit fault interval detection system as claimed in claim 1, wherein the power distribution main station comprises an information acquisition unit, a first calculation unit, a storage unit, a second calculation unit, an interval judgment unit, an analysis unit and a result output unit, wherein:
the information acquisition unit is used for acquiring switching-on and tripping information sent by the outgoing line breaker of the transformer substation and acquiring a switching-on time point and a tripping time point of the outgoing line breaker of the transformer substation;
the first calculating unit is used for calculating the time difference delta t between the tripping time point and the closing time point of the outgoing line breaker of the transformer substation;
the storage unit is used for storing the power-on delay switching-on time limit of each power distribution automatic switch set by the power distribution terminal;
second oneThe calculating unit is used for calculating the total time T from the power-on of the 1 st distribution automatic switch to the closing of the nth distribution automatic switch according to the power-on delay closing time limit of each distribution automatic switchn；
Section determination means for determining a section [ T ] in which the time difference [ Δ T ] fallsn，Tn+1]；
The analysis unit is used for obtaining a short-circuit fault section according to the section judged by the section judgment unit;
and the result output unit is used for outputting the short-circuit fault section.
3. The in-situ reclosing feeder automation line short-circuit fault interval detection system of claim 2, where the distribution master station further includes a correction unit for correcting the power-on delay and switch-on time limit of the distribution automation switch stored in the storage unit.
4. The reconciled feeder automation line short fault interval detection system of claim 3, wherein the rectification comprises: obtaining the power-on delay switching-on time limit X of the distribution automation switch according to the test at regular or irregular intervalsn' additionally correcting the power-on delay closing time limit X of each distribution automation switch stored in the storage unitn＝Xn′。
5. The reconciled feeder automation line short-circuit fault interval detection system of claim 2, wherein the total time T from power-up of the 1 st distribution automation switch to power-on of the nth distribution automation switch isnThe calculation formula of (2) is as follows:
Figure FDA0003162492810000021
wherein XnThe power-on delay switching-on time limit of the nth distribution automatic switch is shown, and Y shows other distribution automation of power-on switching-on in the power-on timing process of the nth distribution automatic switchAnd changing the X time limit of the switch.
CN202110795277.8A 2021-07-14 2021-07-14 Overlapping type feeder automation line short circuit fault interval detection system on spot Pending CN113690834A (en)

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