CN109507516A - Earth-fault detecting method, system and storage medium based on steady state fault amount - Google Patents
Earth-fault detecting method, system and storage medium based on steady state fault amount Download PDFInfo
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- CN109507516A CN109507516A CN201811432939.XA CN201811432939A CN109507516A CN 109507516 A CN109507516 A CN 109507516A CN 201811432939 A CN201811432939 A CN 201811432939A CN 109507516 A CN109507516 A CN 109507516A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
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Abstract
The invention discloses the earth-fault detecting methods based on steady state fault amount, three-phase voltage, residual voltage and zero-sequence current including acquiring examining system to be checked；Compare whether residual voltage is greater than residual voltage starting threshold value, singlephase earth fault has occurred if it is greater than then decision-making system；Compare the size of three-phase voltage if singlephase earth fault occurs, determine that the lag of maximum voltage phase is mutually failure phase, and the amplitude and phase of the amplitude of the faulted phase voltage of calculating at this time and phase and zero-sequence current；Compare the size of faulted phase voltage and high resistance ground voltage threshold value, if faulted phase voltage is greater than high resistance earthing fault voltage threshold value, then determine that high resistance earthing fault occurs, then judging whether that single-phase high-impedance has occurred in this route according to the phase relation of faulted phase voltage and zero-sequence current, the present invention is weak to the dependence at fault initiating moment, can complete the fault detection of the single-phase high resistance ground of isolated neutral system.
Description
Technical Field
The invention belongs to the technical field of relay protection, and particularly relates to a single-phase high-resistance earth fault detection method for a power distribution network.
Background
Most of the existing power distribution network systems are mainly grounded through an arc suppression coil or a neutral point, although a single-phase ground fault does not form a zero-sequence current loop, the fault steady-state current is small, insulation damage can be caused along with the rise of fault phase voltage, so that the safe operation of electric equipment is influenced, even the fault is gradually developed into the expansion of accidents caused by interphase short circuit, and therefore, the fault line can be accurately identified, and reliable grounding line selection is completed.
For the non-high-resistance grounding fault, signals of the transient quantity and the steady-state quantity are clear, and effective fault line selection can be performed based on the transient quantity and the existing steady-state quantity algorithm. However, for a high-resistance grounding fault, the starting moment of the high-resistance grounding fault is difficult to capture, the starting moment of a data window is difficult to locate by a transient quantity-based line selection method, a transient signal is weak, and the accuracy of data calculation is difficult to guarantee; under the influence of transition resistance, the traditional steady-state zero-sequence voltage and current direction principle is easy to generate larger phase deviation, and the line selection result is greatly influenced. Therefore, a single-phase high-resistance ground fault detection method applied to an ungrounded system is needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for detecting a single-phase high-resistance grounding fault of a power distribution network, which has weak dependence on the starting time of the fault and can complete the single-phase high-resistance grounding fault detection of a system with a neutral point not grounded.
The technical problem of the invention is mainly solved by the following technical scheme:
in a first aspect, a method for detecting a ground fault based on a steady-state fault amount is provided, the method comprising the steps of:
collecting three-phase voltage, zero-sequence voltage and zero-sequence current of a line to be detected;
comparing whether the zero-sequence voltage is greater than a zero-sequence voltage starting threshold value, and if so, judging that the system has a single-phase earth fault;
if single-phase earth faults occur, comparing the three-phase voltages, judging the lagging phase of the maximum voltage phase as a fault phase, and calculating the amplitude and the phase of the fault phase voltage and the amplitude and the phase of zero-sequence current at the moment;
and comparing the magnitude of the fault phase voltage with the high-resistance grounding voltage threshold value, if the fault phase voltage is greater than the high-resistance grounding fault voltage threshold value, judging that the high-resistance grounding fault occurs, and then judging whether the line has the single-phase high-resistance grounding fault according to the phase relation of the fault phase voltage and the zero-sequence current.
With reference to the first aspect, further, the determining whether a single-phase high-resistance ground fault occurs according to a phase relationship between a fault phase voltage and a zero sequence current specifically includes: when the phase difference between the fault phase voltage and the zero sequence current is within the range of the phase difference angle threshold value, the circuit is judged to have the single-phase high-resistance grounding fault, and the judgment formula is as follows:
wherein,is the threshold value of the phase difference angle,is the phase of the faulted phase voltage,the phase of the zero sequence current.
With reference to the first aspect, further, after the single-phase ground fault occurs, the amplitude and the phase of the fault phase voltage and the amplitude and the phase of the zero-sequence current are calculated by using the steady-state data after the fault.
In a second aspect, a steady-state fault amount-based ground fault detection system includes:
an acquisition module: the system comprises a circuit to be detected, a voltage acquisition unit and a voltage acquisition unit, wherein the circuit to be detected is used for acquiring three-phase voltage, zero-sequence voltage and zero-sequence current of a circuit to be detected;
a determination module: the system is used for comparing whether the zero sequence voltage is larger than a zero sequence voltage starting threshold value or not, and if so, judging that the system has a single-phase earth fault; if single-phase earth faults occur, comparing the three-phase voltages, judging the lagging phase of the maximum voltage phase as a fault phase, and calculating the amplitude and the phase of the fault phase voltage and the amplitude and the phase of zero-sequence current at the moment;
and comparing the magnitude of the fault phase voltage with the high-resistance grounding voltage threshold value, if the fault phase voltage is greater than the high-resistance grounding fault voltage threshold value, judging that the high-resistance grounding fault occurs, and then judging whether the line has the single-phase high-resistance grounding fault according to the phase relation of the fault phase voltage and the zero-sequence current.
In a third aspect, a steady-state fault amount based ground fault detection system includes a memory and a processor;
the memory is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method of any of the first aspects.
In a fourth aspect, a computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the method of any one of the first aspect.
The invention has the beneficial effects that: the power distribution network single-phase high-resistance grounding fault detection method based on the steady-state fault amount judges the steady-state fault amount after the fault, the dependency on the fault starting time is weak, the single-phase high-resistance grounding fault detection of a neutral point ungrounded system can be completed, the phase difference of a fault recognition algorithm is closer to a sensitive angle along with the increase of the transition resistance within a certain range of the transition resistance, and the application prospect is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a single-phase high-resistance earth fault detection method of a power distribution network.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art, and the scope of the invention will be more clearly and clearly defined
A method for detecting ground fault based on steady-state fault quantity adopts fault phase voltage and zero sequence current after fault to judge, the working flow is shown in figure 1, and comprises the following steps:
the method comprises the following steps: collecting and calculating the three-phase voltage (U) of the line to be detecteda、Ub、Uc) Zero sequence voltage U0And zero sequence current I0。
Step two: determine zero sequence voltage U0Whether the voltage is larger than the starting threshold value U of the zero sequence voltage0.set(the threshold value is obtained according to theoretical calculation, dynamic simulation experiment and actual operation experience), if U0＞U0.setThen it is determined that a single-phase ground fault has occurred.
Step three: comparing the three-phase voltages, determining the lagging phase of the maximum voltage phase as the fault phase, and calculating the fault phase voltage U at the momentphAmplitude and phase ofAnd zero sequence current I0Amplitude and phase of
According to the fault phase voltage UphJudging whether the high-resistance grounding fault exists or not according to the size relation with the high-resistance grounding voltage threshold, and if U is judged to be the high-resistance grounding fault, judging whether the high-resistance grounding fault exists or notph＞Uph.setThen enter the high impedance grounding determination procedure.
When single-phase earth fault occurs in ungrounded system, zero sequence current I0Can be expressed as:
I0＝j3w(C1+C2+...Cn-1)EA(1)
current at earth point IJCan be expressed as:
IJ＝-j3w(C1+C2+...Cn-1+Cn)EA(2)
wherein, C1...Cn-1Representing the single-phase capacitance to ground, C, of lines 1 to n-1, respectivelynSingle-phase to ground capacitance, E, representing a faulty lineARepresenting the positive sequence emf of the generator. Since the direction of the capacitive current is the same for all lines, i.e., j3wC1，j3wC2...j3wCnAre all equal to I0Same, therefore IJAnd I0The phases are opposite, where j is the imaginary part and w is the angular velocity.
For single-phase transition resistance earth fault in ungrounded system, fault phase voltage U of fault linephWith zero sequence current I0The following relationship is satisfied:
Uph＝Z0I0-3RgIJ≈-3RgIJ(3)
wherein R isgTo transition resistance, Z0To protect the zero sequence impedance of the line from installation to the point of failure, Z is set when the earth fault is high impedance earthed0Negligible compared to the transition resistance. Therefore UphAnd IJIn opposite phase to I0The phases are the same.
So as to act as UphAnd I0When the phase difference is within a certain range, the circuit can be judged to have single-phase high-resistance earth fault, and the judgment formula is as follows:
wherein the phase difference angle thresholdThe fault phase voltage U is obtained within the resistance size range of 30 degrees (the threshold value is determined according to theoretical calculation, dynamic simulation experiment and actual operation experience), and along with the increase of the transition resistancephWith zero sequence current I0The closer the phase difference of (a) is to the sensitive angle.
The use of the steady-state fault quantity has lower requirement on the rapidity of fault starting, and can improve the accuracy of data used for fault starting judgment and line selection calculation.
In conclusion, the method for detecting the single-phase high-resistance grounding fault of the power distribution network based on the steady-state fault amount can effectively improve the accuracy and reliability of the detection of the single-phase high-resistance grounding fault of the ungrounded neutral point system, and has a good application prospect.
The invention provides a power distribution network single-phase high-resistance earth fault detection system which can be used for loading and executing the earth fault detection method based on steady-state fault quantity, and comprises the following steps:
an acquisition module: the system comprises a circuit to be detected, a voltage acquisition unit and a voltage acquisition unit, wherein the circuit to be detected is used for acquiring three-phase voltage, zero-sequence voltage and zero-sequence current of a circuit to be detected;
a determination module: the system is used for comparing whether the zero sequence voltage is larger than a zero sequence voltage starting threshold value or not, and if so, judging that the system has a single-phase earth fault;
if single-phase earth faults occur, comparing the three-phase voltages, judging the lagging phase of the maximum voltage phase as a fault phase, and calculating the amplitude and the phase of the fault phase voltage and the amplitude and the phase of zero-sequence current at the moment;
and comparing the magnitude of the fault phase voltage with the high-resistance grounding voltage threshold value, if the fault phase voltage is greater than the high-resistance grounding fault voltage threshold value, judging that the high-resistance grounding fault occurs, and then judging whether the line has the single-phase high-resistance grounding fault according to the phase relation of the fault phase voltage and the zero-sequence current.
The invention provides a system for detecting a single-phase high-resistance earth fault of a power distribution network, which can also be as follows: comprising a memory and a processor; the memory is to store instructions;
the processor is configured to operate according to the instructions to perform the steps of the steady-state fault amount based ground fault detection method described above.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the aforementioned method of ground fault detection based on the amount of steady-state faults.
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 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.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A ground fault detection method based on steady-state fault quantity is characterized by comprising the following steps:
collecting three-phase voltage, zero-sequence voltage and zero-sequence current of a line to be detected;
comparing whether the zero-sequence voltage is greater than a zero-sequence voltage starting threshold value, and if so, judging that the system has a single-phase earth fault;
if single-phase earth faults occur, comparing the three-phase voltages, judging the lagging phase of the maximum voltage phase as a fault phase, and calculating the amplitude and the phase of the fault phase voltage and the amplitude and the phase of zero-sequence current at the moment;
and comparing the magnitude of the fault phase voltage with the high-resistance grounding voltage threshold value, if the fault phase voltage is greater than the high-resistance grounding fault voltage threshold value, judging that the high-resistance grounding fault occurs, and then judging whether the line has the single-phase high-resistance grounding fault according to the phase relation of the fault phase voltage and the zero-sequence current.
2. The steady-state fault amount-based ground fault detection method according to claim 1, characterized in that: the method for judging whether the single-phase high-resistance ground fault occurs or not according to the phase relation between the fault phase voltage and the zero sequence current specifically comprises the following steps: when the phase difference between the fault phase voltage and the zero sequence current is within the range of the phase difference angle threshold value, the circuit is judged to have the single-phase high-resistance grounding fault, and the judgment formula is as follows:
wherein,is the threshold value of the phase difference angle,is the phase of the faulted phase voltage,the phase of the zero sequence current.
3. The steady-state fault amount-based ground fault detection method according to claim 1, characterized in that: after the single-phase earth fault occurs, the amplitude and the phase of the fault phase voltage and the amplitude and the phase of the zero sequence current are calculated by using the steady-state data after the fault occurs.
4. A ground fault detection system based on a steady state fault amount, comprising:
an acquisition module: the system comprises a circuit to be detected, a voltage acquisition unit and a voltage acquisition unit, wherein the circuit to be detected is used for acquiring three-phase voltage, zero-sequence voltage and zero-sequence current of a circuit to be detected;
a determination module: the system is used for comparing whether the zero sequence voltage is larger than a zero sequence voltage starting threshold value or not, and if so, judging that the system has a single-phase earth fault;
if single-phase earth faults occur, comparing the three-phase voltages, judging the lagging phase of the maximum voltage phase as a fault phase, and calculating the amplitude and the phase of the fault phase voltage and the amplitude and the phase of zero-sequence current at the moment;
and comparing the magnitude of the fault phase voltage with the high-resistance grounding voltage threshold value, if the fault phase voltage is greater than the high-resistance grounding fault voltage threshold value, judging that the high-resistance grounding fault occurs, and then judging whether the line has the single-phase high-resistance grounding fault according to the phase relation of the fault phase voltage and the zero-sequence current.
5. A ground fault detection system based on a steady state fault amount is characterized by comprising a memory and a processor;
the memory is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 3.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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Cited By (10)
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| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
| CN111257694A (en) * | 2020-02-25 | 2020-06-09 | 杭州柯林电气股份有限公司 | Single-phase high-resistance earth fault positioning method and device for distribution network line |
| CN111308278A (en) * | 2020-05-11 | 2020-06-19 | 国网江西省电力有限公司电力科学研究院 | High-resistance fault direction detection method for resonant grounding system |
| CN111983509A (en) * | 2020-07-14 | 2020-11-24 | 国网上海市电力公司 | Distributed line fault detection method and device |
| CN112379302A (en) * | 2020-10-19 | 2021-02-19 | 国电南瑞科技股份有限公司 | Small current ground fault protection method, device and system integrating time-frequency domain information |
| CN112731047A (en) * | 2020-12-03 | 2021-04-30 | 天津大学 | Fault line selection method suitable for flexible grounding system |
| CN113820620A (en) * | 2021-08-17 | 2021-12-21 | 捍防（深圳）实业有限公司 | Fault analysis method and fault analysis device for power supply system |
| CN113848508A (en) * | 2021-09-10 | 2021-12-28 | 南方电网调峰调频发电有限公司 | Battery energy storage system alternating current side single-point grounding fault positioning method through leakage current |
| CN114089093A (en) * | 2021-10-13 | 2022-02-25 | 国电南瑞科技股份有限公司 | Single-phase earth fault starting judging method, system, storage medium and computing equipment |
| CN114113914A (en) * | 2021-12-08 | 2022-03-01 | 国网湖南省电力有限公司 | Power distribution network single-phase earth fault detection method based on zero sequence impedance comparison |
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