CN112924807A - Setting method and system for distance protection action time constant value - Google Patents

Setting method and system for distance protection action time constant value Download PDF

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Publication number
CN112924807A
CN112924807A CN202110059340.1A CN202110059340A CN112924807A CN 112924807 A CN112924807 A CN 112924807A CN 202110059340 A CN202110059340 A CN 202110059340A CN 112924807 A CN112924807 A CN 112924807A
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China
Prior art keywords
fault
distance
impedance
determining
action time
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Inventor
王书扬
李天华
王兴国
梁英
杨国生
周泽昕
杜丁香
程琪
陈争光
郭雅蓉
曹虹
戴飞扬
吴秋丽
范荣奇
李靖
戈宁
宫德锋
陈雪峰
王宝松
王玥婷
杨超
史文芳
李玉敏
刘萌
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Sichuan Electric Power Co Ltd
TaiAn Power Supply Co of State Grid Shandong Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Sichuan Electric Power Co Ltd
TaiAn Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Priority to CN202110059340.1A priority Critical patent/CN112924807A/en
Publication of CN112924807A publication Critical patent/CN112924807A/en
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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
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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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  • Engineering & Computer Science (AREA)
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  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a method and a system for setting a distance protection action time constant value, and belongs to the technical field of electricity. The method comprises the following steps: acquiring a current and voltage sampling value of a distance protection device of a high-voltage transmission line, and determining a current power frequency phasor and a voltage power frequency phasor; starting the element and the phase selection element to act after the high-voltage transmission line distance protection device fails, and determining a fault phase of the high-voltage transmission line distance protection device; determining the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase, and determining the fault distance according to the impedance of the positive sequence fault; and setting the distance protection action time constant value according to the fault distance. Aiming at the distance protection of the high-voltage transmission line, the traditional time constant value offline setting method is replaced by the time constant value online setting method of the distance protection II section and the distance protection III section, and the problem of large workload of the traditional distance protection setting of the line is solved.

Description

Setting method and system for distance protection action time constant value
Technical Field
The present invention relates to the field of electrical technology, and more particularly, to a method and a system for setting a distance protection action time constant value.
Background
Distance protection is a protection mode for identifying and positioning faults by utilizing the ratio of measured voltage to measured current at a protection installation position, has the advantages of no need of a channel, small influence by an operation mode and the like, is always used as an important protection type, and is widely applied to power transmission lines with 110kV and above voltage levels at home and abroad.
The traditional line distance protection adopts a stage type matching method, a distance II section and a distance III section are used as backup protection, and the action fixed value and the action time delay of the backup protection are preset fixed values, so that recalculation is needed after the structure of a power grid or the operation mode is changed. And the fixed values of the section II and the section III of the traditional distance protection are calculated off-line by a scheduling staff according to the system wiring mode and system parameters, and after the fixed value setting is finished, the fixed value is input into the line protection device by a field operation maintenance staff. However, the distance protection principle and the action characteristic of different manufacturers are different, so that the distance protection constant value difference is large, and the problems of large calculation workload, weak fixed value adaptability, low setting calculation efficiency and mismatching of upper and lower-stage lines exist.
Disclosure of Invention
The invention aims to solve the problem of large workload of traditional line distance protection setting by using an online time constant value setting method of a distance protection II section and a distance protection III section to replace the traditional offline time constant value setting method aiming at the distance protection of a high-voltage transmission line, and provides a setting method for a distance protection action time constant value, which comprises the following steps:
acquiring a current and voltage sampling value of a distance protection device of the high-voltage transmission line, and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
when the high-voltage transmission line distance protection device fails and the starting element and the phase selection element act, determining a fault phase of the high-voltage transmission line distance protection device according to the actions of the starting element and the phase selection element;
determining the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase, and determining the fault distance according to the impedance of the positive sequence fault;
and setting the distance protection action time constant value according to the fault distance.
Optionally, the positive sequence fault includes: an inter-phase short circuit fault or a ground short circuit fault.
Optionally, the calculation formula for determining the inter-phase short-circuit fault impedance and the fault distance according to the impedance is as follows:
Figure BDA0002896244770000021
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure BDA0002896244770000022
to protect the difference between the two faulty phases at the installation site,
Figure BDA0002896244770000023
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
Optionally, the determining the fault distance according to the impedance of the ground short fault includes:
determining an iteration starting point formula, wherein the formula is as follows:
Figure BDA0002896244770000024
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure BDA0002896244770000025
to protect the installation site from measuring voltage phasors,
Figure BDA0002896244770000026
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure BDA0002896244770000027
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure BDA0002896244770000028
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure BDA0002896244770000031
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
Optionally, the setting the distance protection action time fixed value includes:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure BDA0002896244770000032
T0Protecting the minimum action time, t, for a distance set by a userjThe j is the j-th section of action time, j is 1-4, L is the total length of the protected line, and finally the II section of action time t is protected according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
optionally, when the distance protection action time is determined, if the fault distance L is determinedCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure BDA0002896244770000041
the invention also provides a setting system for the distance protection action time constant value, which comprises the following steps:
the acquisition unit is used for acquiring a current and voltage sampling value of the distance protection device of the high-voltage transmission line and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
the fault phase determining unit is used for determining a fault phase of the high-voltage transmission line distance protection device according to the actions of the starting element and the phase selection element when the starting element and the phase selection element act after the high-voltage transmission line distance protection device fails;
the fault distance determination unit is used for determining the impedance of the positive sequence fault and determining the fault distance according to the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase;
and the setting unit is used for setting the distance protection action time constant value according to the fault distance.
Optionally, the positive sequence fault includes: an inter-phase short circuit fault or a ground short circuit fault.
Optionally, the calculation formula for determining the inter-phase short-circuit fault impedance and the fault distance according to the impedance is as follows:
Figure BDA0002896244770000042
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure BDA0002896244770000043
to protect the difference between the two faulty phases at the installation site,
Figure BDA0002896244770000044
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
Optionally, the determining the fault distance according to the impedance of the ground short fault includes:
determining an iteration starting point formula, wherein the formula is as follows:
Figure BDA0002896244770000051
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure BDA0002896244770000052
to protect the installation site from measuring voltage phasors,
Figure BDA0002896244770000053
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure BDA0002896244770000054
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure BDA0002896244770000055
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure BDA0002896244770000056
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
Optionally, the setting the distance protection action time fixed value includes:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure BDA0002896244770000057
T0Protecting the minimum action time, t, for a distance set by a userjIs the j sectionThe action time, j is 1-4, L is the total length of the protected line, and finally the action time t of the section II is protected according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
optionally, when the distance protection action time is determined, if the fault distance L is determinedCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure BDA0002896244770000061
the invention discloses an on-line setting method for action time fixed values of a distance protection II section and a distance protection III section of a high-voltage transmission line, which realizes on-line setting of the action time fixed values of the distance protection II section and the distance protection III section, can ensure the self-adaptive matching of the action time of an upper-stage line and a lower-stage line and solves the problem of large workload of traditional distance protection setting.
Drawings
FIG. 1 is a flow chart of a method for setting a distance protection action time constant value of the present invention;
FIG. 2 is a block diagram of a tuning system for distance protection action time setpoints according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a setting method for a distance protection action time constant value, as shown in fig. 1, comprising the following steps:
acquiring a current and voltage sampling value of a distance protection device of the high-voltage transmission line, and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
when the high-voltage transmission line distance protection device fails and the starting element and the phase selection element act, determining a fault phase of the high-voltage transmission line distance protection device according to the actions of the starting element and the phase selection element;
determining the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase, and determining the fault distance according to the impedance of the positive sequence fault;
and setting the distance protection action time constant value according to the fault distance.
Wherein the positive sequence fault comprises: an inter-phase short circuit fault or a ground short circuit fault.
The calculation formula for determining the fault distance according to the impedance of the interphase short-circuit fault is as follows:
Figure BDA0002896244770000071
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure BDA0002896244770000072
to protect the difference between the two faulty phases at the installation site,
Figure BDA0002896244770000073
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
Wherein, the impedance of ground short circuit fault reaches according to impedance determination fault distance, includes:
determining an iteration starting point formula, wherein the formula is as follows:
Figure BDA0002896244770000074
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure BDA0002896244770000075
to protect the installation site from measuring voltage phasors,
Figure BDA0002896244770000076
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure BDA0002896244770000077
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure BDA0002896244770000078
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure BDA0002896244770000081
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
The method for setting the distance protection action time constant value comprises the following steps:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure BDA0002896244770000082
T0Protecting the minimum action time, t, for a distance set by a userjThe j-th section of action time, L the total length of the protected line, and finally protecting the II section of action time t according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
wherein, when the distance protection action time is determined, if the fault distance LCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure BDA0002896244770000091
the present invention further provides a setting system 200 for distance protection action time constant value, as shown in fig. 2, including:
the acquisition unit 201 is used for acquiring a current and voltage sampling value of the distance protection device of the high-voltage transmission line, and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
a fault phase determination unit 202, configured to determine a fault phase of the distance protection device for the high-voltage transmission line according to actions of the start element and the phase selection element when the start element and the phase selection element act after the distance protection device for the high-voltage transmission line has a fault;
the fault distance determination unit 203 determines the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase, and determines the fault distance according to the impedance of the positive sequence fault;
the setting unit 204 sets the distance protection action time constant value according to the fault distance.
Wherein the positive sequence fault comprises: an inter-phase short circuit fault or a ground short circuit fault.
The calculation formula for determining the fault distance according to the impedance of the interphase short-circuit fault is as follows:
Figure BDA0002896244770000092
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure BDA0002896244770000093
to protect the difference between the two faulty phases at the installation site,
Figure BDA0002896244770000094
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
Wherein, the impedance of ground short circuit fault reaches according to impedance determination fault distance, includes:
determining an iteration starting point formula, wherein the formula is as follows:
Figure BDA0002896244770000101
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure BDA0002896244770000102
to protect the installation site from measuring voltage phasors,
Figure BDA0002896244770000103
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure BDA0002896244770000104
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure BDA0002896244770000105
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure BDA0002896244770000106
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
The method for setting the distance protection action time constant value comprises the following steps:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure BDA0002896244770000107
T0Protecting the minimum action time, t, for a distance set by a userjThe j-th section of action time, L the total length of the protected line, and finally protecting the II section of action time t according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
wherein, when the distance protection action time is determined, if the fault distance LCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure BDA0002896244770000111
the invention discloses an on-line setting method for action time fixed values of a distance protection II section and a distance protection III section of a high-voltage transmission line, which realizes on-line setting of the action time fixed values of the distance protection II section and the distance protection III section, can ensure the self-adaptive matching of the action time of an upper-stage line and a lower-stage line and solves the problem of large workload of traditional distance protection setting.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (12)

1. A method for setting a distance protection action time constant, the method comprising:
acquiring a current and voltage sampling value of a distance protection device of the high-voltage transmission line, and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
when the high-voltage transmission line distance protection device fails and the starting element and the phase selection element act, determining a fault phase of the high-voltage transmission line distance protection device according to the actions of the starting element and the phase selection element;
determining the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase, and determining the fault distance according to the impedance of the positive sequence fault;
and setting the distance protection action time constant value according to the fault distance.
2. The method of claim 1, the positive sequence fault comprising: an inter-phase short circuit fault or a ground short circuit fault.
3. The method according to claim 2, wherein the impedance of the interphase short-circuit fault and the calculation formula for determining the fault distance according to the impedance are as follows:
Figure FDA0002896244760000015
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure FDA0002896244760000016
to protect the difference between the two faulty phases at the installation site,
Figure FDA0002896244760000017
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
4. The method of claim 2, the impedance of the short-to-ground fault and determining a fault distance from the impedance comprising:
determining an iteration starting point formula, wherein the formula is as follows:
Figure FDA0002896244760000011
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure FDA0002896244760000012
to protect the installation site from measuring voltage phasors,
Figure FDA0002896244760000013
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure FDA0002896244760000014
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure FDA0002896244760000021
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure FDA0002896244760000022
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
5. The method of claim 1, the tuning a distance protection action time constant value, comprising:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure FDA0002896244760000023
T0Protecting the minimum action time, t, for a distance set by a userjThe j is the j-th section of action time, j is 1-4, L is the total length of the protected line, and finally the II section of action time t is protected according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
6. the method of claim 5, wherein the distance L is determined if the fault is present during the distance protection action timeCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure FDA0002896244760000031
7. a tuning system for distance protection action time rating, the system comprising:
the acquisition unit is used for acquiring a current and voltage sampling value of the distance protection device of the high-voltage transmission line and determining a current power frequency phasor and a voltage power frequency phasor according to the current and voltage sampling value;
the fault phase determining unit is used for determining a fault phase of the high-voltage transmission line distance protection device according to the actions of the starting element and the phase selection element when the starting element and the phase selection element act after the high-voltage transmission line distance protection device fails;
the fault distance determination unit is used for determining the impedance of the positive sequence fault and determining the fault distance according to the impedance of the positive sequence fault according to the determined current power frequency phasor, the determined voltage power frequency phasor and the determined fault phase;
and the setting unit is used for setting the distance protection action time constant value according to the fault distance.
8. The system of claim 7, the positive sequence fault comprising: an inter-phase short circuit fault or a ground short circuit fault.
9. The system of claim 8, wherein the impedance of the interphase short-circuit fault and the calculation formula for determining the fault distance from the impedance are as follows:
Figure FDA0002896244760000032
in the formula, ZCIs the impedance of the short-circuit fault between phases,
Figure FDA0002896244760000033
to protect the difference between the two faulty phases at the installation site,
Figure FDA0002896244760000034
is the current difference, Z, of two fault phases1Is a positive sequence impedance per unit length of line, LCIs the distance to failure.
10. The system of claim 8, the impedance of the short-to-ground fault and determining a fault distance from the impedance comprising:
determining an iteration starting point formula, wherein the formula is as follows:
Figure FDA0002896244760000041
in the formula ZC(0)Starting point of iteration for measuring impedance, ZmIn order to measure the impedance of the device,
Figure FDA0002896244760000042
for protecting the installation site measurementsThe phasor of the voltage is used as the reference,
Figure FDA0002896244760000043
for protecting the installation site, the current phasor is measured with k ═ Z0-Z1)/3Z1Is a zero sequence compensation coefficient, Z0,Z1Respectively a positive sequence impedance and a zero sequence impedance of the line,
Figure FDA0002896244760000044
in order to protect zero sequence current phasor measured at an installation position, theta is a line positive sequence impedance angle;
determining the criterion of the zero-sequence reactance relay as follows:
Figure FDA0002896244760000045
in the formula, ZC(k)Judging whether an iteration starting point formula meets an iteration condition for the fault impedance after the kth iterative computation according to a zero sequence reactance relay criterion, if so, carrying out the iterative computation of preset iteration times, wherein the iteration condition is as follows:
Figure FDA0002896244760000046
after the iterative computation is completed, determining the fault distance, wherein the formula is as follows:
LC＝|ZC(10)|/Z1
in the formula, ZC(10)The calculated fault impedance for the 10 th iteration.
11. The system of claim 7, the setting a distance protection action time constant value comprising:
and determining the distance protection action time according to the fault distance, wherein the determination formula is as follows:
distance protection II period action time
Figure FDA0002896244760000047
T0Protecting the minimum action time, t, for a distance set by a userjThe j is the j-th section of action time, j is 1-4, L is the total length of the protected line, and finally the II section of action time t is protected according to the distanceop.IIDetermining distance protection III section action time top.IIIThe formula is as follows:
top.III＝top.II+1.5。
12. the system of claim 11, wherein the distance to failure L is determined when the distance to protection action time is determinedCIf the total length of the line is less than 0.6 times, the distance protection is not delayed by the exit, and the kth action time tk(k ═ 1,2,3,4) satisfies the following formula:
Figure FDA0002896244760000051
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