CN105548810B - A kind of bus-bar fault gas chamber localization method and device - Google Patents

A kind of bus-bar fault gas chamber localization method and device Download PDF

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Publication number
CN105548810B
CN105548810B CN201510965240.XA CN201510965240A CN105548810B CN 105548810 B CN105548810 B CN 105548810B CN 201510965240 A CN201510965240 A CN 201510965240A CN 105548810 B CN105548810 B CN 105548810B
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fault
node
current
current distribution
switch
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CN105548810A (en
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段开元
吴劲晖
陈水耀
王艇
胡俊华
陈彩霞
吴福寿
张志展
赖尚峰
方涛
顾水平
戴哲仁
丁莉
韩春雷
单金华
李斌帅
张波
朱日成
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Maintenance Branch of State Grid Zhejiang Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Maintenance Branch of State Grid Zhejiang Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • 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
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

This application discloses a kind of bus-bar fault gas chamber localization method and devices,Applied in generalized information system,Generalized information system includes two busbares,Several gas chambers being arranged on busbar,Several switches being connected in parallel between two busbares and the external branch with switch connection,In the bus-bar fault positioning for carrying out generalized information system,The Injection Current of branch outside each item of fault moment of read failure oscillograph acquisition,And the current distribution that fault moment respectively switchs,Respectively on analog bus during each gas chamber independent failure,Utilize the Injection Current of branch outside each item of fault moment,Calculate the current distribution of each switch,For simulation each gas chamber independent failure when the current distribution respectively switched that is calculated,The current distribution that its fault moment acquired with fault oscillograph respectively switchs is compared respectively,The immediate simulated failure gas chamber of current distribution comparison result is determined as fault gas chamber.The application reduces the range that busbar gas chamber carries out micro- water test, improves fault location efficiency.

Description

Bus fault air chamber positioning method and device
Technical Field
The application relates to the technical field of transformer substations, in particular to a method and a device for positioning a bus fault air chamber.
Background
In a gas Insulated substation GIS (gas Insulated substation) system, a plurality of air chambers are arranged on a bus, and once the air chambers are damaged, the bus fails.
In order to ensure the normal operation of the GIS system, a fault air chamber needs to be quickly positioned when a bus fails. In the prior art, when a fault air chamber is searched, an SF6 micro-water test is generally carried out on bus air chambers one by one so as to detect whether fault gas occurs in the air chambers. However, the bus is often provided with hundreds of air chambers, the sizes of the air chambers are different, the fault location time can be greatly prolonged by adopting a detection method of carrying out micro-water tests one by one, and the fault location efficiency is extremely low.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for positioning a bus fault air chamber, which are used to solve the problems of long fault positioning time and low efficiency of the existing fault air chamber positioning method.
In order to achieve the above object, the following solutions are proposed:
a bus fault air chamber positioning method is applied to a GIS system of an SF6 gas insulated substation, the GIS system comprises two buses, a plurality of air chambers arranged on the buses, a plurality of switches connected between the two buses in parallel and an external branch connected with the switches, and the method comprises the following steps:
when the bus of the GIS system is determined to have a fault, reading the injection current of each external branch at the fault moment acquired by a fault recorder and the current distribution of each switch at the fault moment acquired by the fault recorder, wherein the fault recorder is respectively connected with each external branch;
when the independent faults of each air chamber on the bus are simulated respectively, the current distribution of each switch is calculated by using the injected current of each external branch at the moment of the fault;
and respectively comparing the current distribution of each switch obtained by calculation when each simulated gas chamber has single fault with the current distribution of each switch at the fault moment acquired by the fault recorder, and determining the simulated fault gas chamber with the closest current distribution comparison result as the fault gas chamber.
Preferably, the GIS system adopts a three-half connection mode, and when each air chamber on the bus fails independently, the current distribution of each switch is calculated by using the injected current of each external branch at the time of the failure, including:
and (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresents the impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
calculating a node voltage equation to obtain the voltage of each node to ground, and calculating the current distribution of a branch between any two nodes at the fault moment:
wherein, when a switch is arranged between the node i and the node j,switching current, Zij(lower case) is the impedance of the switch between node i and node j.
The utility model provides a bus fault air chamber positioner, is applied to in SF6 gas insulated substation GIS system, and GIS system includes two generating lines, sets up a plurality of air chamber on the generating line, connects in parallel a plurality of switch between two generating lines and the outside branch road of being connected with the switch, and the device includes:
the data reading unit is used for reading the injection current of each external branch at the fault moment acquired by the fault recorder and the current distribution of each switch at the fault moment acquired by the fault recorder when the bus of the GIS system is determined to have a fault, wherein the fault recorder is respectively connected with each external branch;
the current distribution calculating unit is used for calculating the current distribution of each switch by using the injection current of each external branch at the fault moment when each air chamber on the bus has single fault;
and the current distribution comparison unit is used for respectively comparing the current distribution of each switch obtained by calculation when each simulated gas chamber has single fault with the current distribution of each switch at the fault moment acquired by the fault recorder, and determining the simulated fault gas chamber with the closest current distribution comparison result as the fault gas chamber.
Preferably, the current distribution calculating unit includes:
the first current distribution calculating subunit is used for calculating the voltage of each node in the GIS system when the GIS system adopts a three-half wiring mode:
and (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresents the impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
and the second current distribution calculating subunit is used for calculating the current distribution of the branch between any two nodes at the fault moment after the voltage of each node is obtained through calculation:
wherein, when a switch is arranged between the node i and the node j,for switching a current, Zij(lower case) is the impedance of the switch between node i and node j.
It can be seen from the above technical solutions that the bus fault air chamber positioning method provided in the embodiments of the present application is applied to a GIS system, which includes two buses, a plurality of air chambers disposed on the buses, a plurality of switches connected in parallel between the two buses, and external branches connected to the switches, when determining that a bus of the GIS system has a fault, the present application reads the injection current of each external branch at the time of the fault and collected by a fault recorder, and the current distribution of each switch at the time of the fault and collected by the fault recorder, respectively simulates the current distribution of each air chamber on the bus when each air chamber has an individual fault, calculates the current distribution of each switch by using the injection current of each external branch at the time of the fault, then compares the current distribution of each switch calculated when each air chamber has an individual fault with the current distribution of each switch at the time of the fault and collected by the fault recorder, and determining the simulated fault air chamber with the current distribution comparison result closest to the current distribution comparison result as a fault air chamber. According to the method and the device, when the bus is determined to have a fault, the distribution situation of each switch current is simulated when each air chamber has a fault, the distribution situation of each switch current is compared with the distribution situation of each switch current really acquired by the fault recorder, and the simulated fault air chamber with the closest comparison result is the real fault air chamber, so that the fault air chamber is positioned without performing a micro-water test method on the bus air chambers one by one, the fault positioning time is greatly shortened, and the fault positioning efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application 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, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a common three-half connection of a 500kV substation according to an example of the present application;
FIG. 2 is a flowchart of a method for positioning a bus fault plenum disclosed in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a bus fault air chamber positioning device disclosed in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a current distribution calculating unit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a common three-half connection of a 500kV substation according to an example of the present application.
As shown in fig. 1, the SF6 gas insulated substation GIS system includes two buses I and II, a plurality of gas chambers Q0-Q6 disposed on the buses, a plurality of switches T011-T033 connected in parallel between the two buses, and external branches 1-6.
The application provides a bus fault air chamber positioning scheme for quickly positioning a fault air chamber when the air chamber on a bus breaks down. Referring to fig. 2, fig. 2 is a flowchart of a bus fault air chamber positioning method disclosed in the embodiment of the present application.
As shown in fig. 2, the method includes:
step S200, when the bus of the GIS system is determined to have a fault, the injection current of each external branch circuit at the fault moment acquired by the fault recorder and the current distribution of each switch at the fault moment acquired by the fault recorder are read;
specifically, the fault recorder is connected with each external branch respectively, and the fault recorder can gather the injection current of each external branch, and the current distribution of each switch can also be gathered to the fault recorder simultaneously.
In this embodiment, the fault recorder may be used to collect the injected current of each external branch at the time of the bus fault and the current distribution of each switch at the time of the fault.
Step S210, when the independent faults of each air chamber on the bus are simulated respectively, the current distribution of each switch is calculated by using the injected current of each external branch at the moment of the fault;
specifically, according to the circuit principle, the individual fault time of each air chamber on the bus is simulated respectively in the step, and the current distribution of each switch is calculated by using the injection current of each external branch at the fault time. For example, assuming that Q0 of fig. 1 fails, the current profile for each switch is calculated based on the injection currents of branches 1-6.
Step S220, aiming at the current distribution of each switch obtained by calculation when each simulated air chamber has single fault, the current distribution of each switch at the fault moment is respectively compared with the current distribution of each switch at the fault moment acquired by the fault recorder, and the simulated fault air chamber with the closest current distribution comparison result is determined as the fault air chamber.
Specifically, the distribution simulates the switch current distribution when each air chamber has an individual fault, and in this step, the switch current distribution when each air chamber has an individual fault is compared with the current distribution of each switch at the fault moment acquired by the fault recorder, and the simulated fault air chamber with the closest current distribution comparison result is determined as the fault air chamber.
For example, for 7 air chambers on the I bus, the result of the distribution of the switching current when the Q0 fault is simulated is X0, the result of the distribution of the switching current when the Q1 fault is X1, the result of the distribution of the switching current when the Q2 fault is X2, the result of the distribution of the switching current when the Q3 fault is X3, the result of the distribution of the switching current when the Q4 fault is X4, the result of the distribution of the switching current when the Q5 fault is X5, and the result of the distribution of the switching current when the Q6 fault is X6. And the current distribution result of each switch at the fault moment acquired by the fault recorder is Y, and the value of X3 is determined to be closest to the value of Y through comparison, so that the Q3 air chamber is determined to be a fault air chamber.
The bus fault air chamber positioning method provided by the embodiment of the application is applied to a GIS system, the GIS system comprises two buses, a plurality of air chambers arranged on the buses, a plurality of switches connected in parallel between the two buses and external branches connected with the switches, when the bus of the GIS system is determined to have a fault, the injection current of each external branch at the fault moment collected by a fault recorder is read, and the current distribution of each switch at the fault moment acquired by the fault recorder respectively simulate the independent fault of each air chamber on the bus, calculating the current distribution of each switch by using the injection current of each external branch at the fault moment, and then, respectively comparing the current distribution of each switch obtained by calculation when each simulated gas chamber has single fault with the current distribution of each switch at the fault moment acquired by the fault recorder, and determining the simulated fault gas chamber with the closest current distribution comparison result as a fault gas chamber. According to the method and the device, when the bus is determined to have a fault, the distribution situation of each switch current is simulated when each air chamber has a fault, the distribution situation of each switch current is compared with the distribution situation of each switch current really acquired by the fault recorder, and the simulated fault air chamber with the closest comparison result is the real fault air chamber, so that the fault air chamber is positioned without performing a micro-water test method on the bus air chambers one by one, the fault positioning time is greatly shortened, and the fault positioning efficiency is improved.
It is further to be explained that, in order to further determine whether the obtained faulty air cell is actually a faulty air cell, the determined faulty air cell may be subjected to an SF6 micro-water test. Compare in the current mode that all carries out the little water test of SF6 to all air chambers one by one, what this application was targeted carries out the little water test of SF6 to single air chamber, and fault location efficiency improves greatly.
It should be noted that, when the gas chamber fault is simulated, the specific calculation process of calculating the current distribution of each switch by using the current injected by the external branch belongs to the prior art, and the calculation method is not improved in the present application, and the current distribution of each switch can be obtained according to the traditional impedance calculation method.
Next, a switching current distribution calculation process is described for a GIS system using a three-half connection method.
And (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresenting the mutual impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
calculating a node voltage equation to obtain the voltage of each node to ground, and calculating the current distribution of a branch between any two nodes at the fault moment:
wherein, when a switch is arranged between the node i and the node j,for switching a current, zijIs the impedance of the switch between node i and node j.
The current distribution result of each switch can be obtained through the calculation.
The bus fault air chamber positioning device provided by the embodiment of the application is described below, and the bus fault air chamber positioning device described below and the bus fault air chamber positioning method described above can be referred to correspondingly.
The bus fault air chamber positioning device is applied to a GIS system of a gas insulated substation, and the GIS system comprises two buses, a plurality of air chambers arranged on the buses, a plurality of switches connected between the two buses in parallel and an external branch connected with the switches. Referring to fig. 3, fig. 3 is a schematic structural view of a bus fault air chamber positioning device disclosed in the embodiment of the present application.
As shown in fig. 3, the apparatus includes:
the data reading unit 31 is configured to read, when it is determined that a bus of the GIS system has a fault, injection currents of the external branches at a fault time collected by the fault recorder and current distributions of the switches at the fault time collected by the fault recorder, where the fault recorder is connected to the external branches respectively;
specifically, the fault recorder is connected with each external branch respectively, and the fault recorder can gather the injection current of each external branch, and the current distribution of each switch can also be gathered to the fault recorder simultaneously.
In this embodiment, the fault recorder may be used to collect the injected current of each external branch at the time of the bus fault and the current distribution of each switch at the time of the fault.
The current distribution calculating unit 32 is configured to calculate current distribution of each switch by using the injected current of each external branch at the time of the fault when each air chamber on the bus has a single fault;
specifically, according to the circuit principle, the individual fault time of each air chamber on the bus is simulated respectively in the step, and the current distribution of each switch is calculated by using the injection current of each external branch at the fault time. For example, assuming that Q0 of fig. 1 fails, the current profile for each switch is calculated based on the injection currents of branches 1-6.
And the current distribution comparison unit 33 is configured to compare the current distribution of each switch obtained by calculation when each simulated gas chamber fails alone with the current distribution of each switch at the failure time acquired by the failure recorder, and determine a simulated failure gas chamber with the closest current distribution comparison result as a failure gas chamber.
Specifically, the distribution simulates the switch current distribution when each air chamber has an individual fault, and in this step, the switch current distribution when each air chamber has an individual fault is compared with the current distribution of each switch at the fault moment acquired by the fault recorder, and the simulated fault air chamber with the closest current distribution comparison result is determined as the fault air chamber.
The bus fault air chamber positioning device provided by the embodiment of the application is applied to a GIS system, when a bus of the GIS system is determined to have a fault, the injection current of each external branch circuit at the moment of the fault collected by a fault recorder is read, the current distribution of each switch at the moment of the fault collected by the fault recorder is obtained, and when each air chamber alone fails on the bus is simulated respectively, the injection current of each external branch circuit at the moment of the fault is utilized to calculate the current distribution of each switch, and then the current distribution of each switch obtained by calculation when each air chamber alone fails is simulated, the current distribution of each switch at the moment of the fault collected by the fault recorder is compared with the current distribution of each switch at the moment of the fault collected by the fault recorder respectively, and a simulated fault air chamber with the closest current distribution comparison result is determined to be. According to the method and the device, when the bus is determined to have a fault, the distribution situation of each switch current is simulated when each air chamber has a fault, the distribution situation of each switch current is compared with the distribution situation of each switch current really acquired by the fault recorder, and the simulated fault air chamber with the closest comparison result is the real fault air chamber, so that the fault air chamber is positioned without performing a micro-water test method on the bus air chambers one by one, the fault positioning time is greatly shortened, and the fault positioning efficiency is improved.
Optionally, the embodiment of the present application illustrates an optional structure of the current distribution calculating unit 32, and as shown in fig. 4, the current distribution calculating unit 32 may include:
the first current distribution calculating subunit 321 is configured to calculate voltages of nodes in the GIS system when the GIS system adopts a three-half connection manner:
and (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresenting the mutual impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
the second current distribution calculating subunit 322 is configured to calculate, after obtaining the voltage of each node through calculation, the current distribution of a branch between any two nodes at the time of the fault:
wherein, when a switch is arranged between the node i and the node j,for switching a current, zijIs the impedance of the switch between node i and node j.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (2)

1. A bus fault air chamber positioning method is applied to a GIS system of an SF6 gas insulated substation, wherein the GIS system comprises two buses, a plurality of air chambers arranged on the buses, a plurality of switches connected in parallel between the two buses and an external branch connected with the switches, and the method is characterized by comprising the following steps:
when the bus of the GIS system is determined to have a fault, reading the injection current of each external branch at the fault moment acquired by a fault recorder and the current distribution of each switch at the fault moment acquired by the fault recorder, wherein the fault recorder is respectively connected with each external branch;
when the independent faults of each air chamber on the bus are simulated respectively, the current distribution of each switch is calculated by using the injected current of each external branch at the moment of the fault;
aiming at the current distribution of each switch obtained by calculation when each simulated air chamber has single fault, respectively comparing the current distribution with the current distribution of each switch at the fault moment acquired by the fault recorder, and determining the simulated fault air chamber with the closest current distribution comparison result as a fault air chamber;
the GIS system adopts a three-half connection mode, and when each air chamber on the bus is separately simulated to have a fault, the GIS system calculates the current distribution of each switch by using the injection current of each external branch at the moment of the fault, and the method comprises the following steps:
and (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresenting the mutual impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
calculating a node voltage equation to obtain the voltage of each node to ground, and calculating the current distribution of a branch between any two nodes at the fault moment:
wherein, when a switch is arranged between the node i and the node j,for switching a current, zijIs the impedance of the switch between node i and node j.
2. The utility model provides a bus fault air chamber positioner, is applied to in SF6 gas insulated substation GIS system, and the GIS system includes two generating lines, sets up a plurality of air chamber on the generating line, connects in parallel a plurality of switch between two generating lines and the outside branch road of being connected with the switch, and its characterized in that, the device includes:
the data reading unit is used for reading the injection current of each external branch at the fault moment acquired by the fault recorder and the current distribution of each switch at the fault moment acquired by the fault recorder when the bus of the GIS system is determined to have a fault, wherein the fault recorder is respectively connected with each external branch;
the current distribution calculating unit is used for calculating the current distribution of each switch by using the injection current of each external branch at the fault moment when each air chamber on the bus has single fault;
the current distribution comparison unit is used for respectively comparing the current distribution of each switch obtained by calculation when each simulated gas chamber has single fault with the current distribution of each switch at the fault moment acquired by the fault recorder, and determining the simulated fault gas chamber with the closest current distribution comparison result as a fault gas chamber;
the current distribution calculation unit includes:
the first current distribution calculating subunit is used for calculating the voltage of each node in the GIS system when the GIS system adopts a three-half wiring mode:
and (3) expressing the voltage of each node in the GIS system by using a node impedance matrix:
wherein,representing the voltage to ground of node i,indicating an injection current, Z, externally to node iiiRepresenting the self-impedance of node i, ZijRepresenting the mutual impedance between node i and node j;
defining the external branches as k branches, and respectively setting the injection current of each external branch as I1To IkAnd the node corresponding to the fault air chamber on the bus is j, and the current of the node j is known according to thevenin theorem as follows:
the current vector in the node voltage equation is expressed as:
and the second current distribution calculating subunit is used for calculating the current distribution of the branch between any two nodes at the fault moment after the voltage of each node is obtained through calculation:
wherein, when a switch is arranged between the node i and the node j,for switching a current, zijIs the impedance of the switch between node i and node j.
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