CN109387729B - Single-phase earth fault phase multi-parameter distinguishing method and device - Google Patents
Single-phase earth fault phase multi-parameter distinguishing method and device Download PDFInfo
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- 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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Abstract
The application discloses a single-phase earth fault phase multi-parameter distinguishing method and a single-phase earth fault phase multi-parameter distinguishing device, wherein four parameters are collected firstly, the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system; then, carrying out Fourier operation on the three-phase voltage and the zero sequence voltage to obtain a zero sequence voltage fundamental wave amplitude; dividing the zero sequence voltage fundamental wave amplitude according to the voltage to obtain four regions; and finally, judging the fault phase conditions of the zero sequence voltage in different regions. According to the technical scheme, the incidence relation of a plurality of system parameters is reasonably utilized, different areas are divided by utilizing zero sequence voltage, and proper, simple and reliable algorithms and criteria are adopted respectively, so that the accurate judgment of the single-phase earth fault phase is realized, and the judgment accuracy is improved.
Description
Technical Field
The application relates to the technical field of analysis and measurement control, in particular to a single-phase earth fault phase multi-parameter distinguishing method and device.
Background
After the single-phase earth fault occurs, the fault is positioned and eliminated as soon as possible, the normal operation of the system is recovered, and the method is an important guarantee for the reliable and safe operation of the power distribution network. Generally, it is considered that the fault phase voltage is lowest after single-phase grounding, which is not the case, and the conclusion is only applicable to grounding faults with small transition resistance, such as:
in a power distribution network system with over-compensated grounding of an arc suppression coil, a track formed by zero sequence voltage Un along with the change of single-phase grounding transition resistance is a semicircle, and the diameter is phase voltage, as shown in FIG. 1. As can be seen from fig. 1 and the geometric principle, the transition resistance is large, when the Un trajectory is located between the arcs O' O, the phase with the lowest amplitude is the C phase, and the failed phase is the next-lowest phase; when the transition resistance is reduced and the Un trace is located between the arcs O' a, the failed phase is the lowest phase. From the above analysis, some researchers have conducted more intensive research on the phase-judging algorithm, and propose a new phase-judging algorithm, that is, a leading phase in which a fault phase is the highest-voltage phase when the system overcompensates; when the system is under-compensated, the fault phase is a lagging phase of the highest voltage phase. The algorithm is the current optimal criterion.
However, the algorithm is still insufficient, when the system is subjected to single-phase metallic grounding, the O' point is almost coincident with the A point, at the moment, two non-fault phase voltages are respectively CA and BA, the two non-fault phase voltages are equal in an ideal state, the two non-fault phase voltages are actually influenced by various factors such as unbalance of the system and sampling errors, the size relation of the CA and the BA is uncertain, and obvious misjudgment probability exists; when the system is grounded in a high resistance mode, and O' is close to an O point, two non-fault phase voltages are also approximately equal and are also influenced by various factors such as unbalance of the system and sampling errors, the size relationship of the two is uncertain, and obvious misjudgment probability exists.
Therefore, how to reduce the misjudgment probability of the single-phase ground fault becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The application provides a single-phase earth fault phase multi-parameter judgment method and device, which are used for judging multi-parameter single-phase earth faults of an arc cancellation coil overcompensation grounding system and reducing misjudgment rate.
On one hand, the application provides a single-phase earth fault phase multi-parameter distinguishing method, which comprises the following steps:
acquiring four parameters, wherein the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
performing Fourier operation on the three-phase voltage and the zero-sequence voltage to obtain a zero-sequence voltage fundamental wave amplitude;
dividing the zero sequence voltage fundamental wave amplitude according to the voltage to obtain four regions;
and judging the fault phase conditions of the zero sequence voltage in different regions.
Optionally, the four regions include a region greater than 70V, a region between 25V and 70V, a region between 15V and 25V, and a region less than 15V.
Optionally, the step of determining the fault phase condition of the zero sequence voltage in different regions includes:
judging which region the zero sequence voltage is in;
if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase;
if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the phase voltage fundamental wave is a fault phase;
if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude;
if the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase voltage fundamental wave with the highest amplitude is a fault phase;
if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again;
if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
In a second aspect, the present application provides a single-phase earth fault phase multi-parameter discriminating device, including:
the device comprises a parameter acquisition unit, a parameter acquisition unit and a control unit, wherein the parameter acquisition unit is used for acquiring four parameters, the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
the operation unit is used for carrying out Fourier operation on the three-phase voltage and the zero sequence voltage to obtain a zero sequence voltage fundamental wave amplitude;
the dividing unit is used for dividing the zero sequence voltage fundamental wave amplitude value according to voltage to obtain four regions;
and the judging unit is used for judging the fault phase conditions of the zero sequence voltage in different regions.
Optionally, the determining unit is further configured to:
judging which region the zero sequence voltage is in; if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude; if the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase voltage fundamental wave with the highest amplitude is a fault phase; if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again; if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
According to the technical scheme, the embodiment of the application provides a single-phase earth fault phase multi-parameter distinguishing method and device, four parameters are collected firstly, the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system; then, carrying out Fourier operation on the three-phase voltage and the zero sequence voltage to obtain a zero sequence voltage fundamental wave amplitude; dividing the zero sequence voltage fundamental wave amplitude according to the voltage to obtain four regions; and finally, judging the fault phase conditions of the zero sequence voltage in different regions. According to the technical scheme, the incidence relation of a plurality of system parameters is reasonably utilized, different areas are divided by utilizing zero sequence voltage, and proper, simple and reliable algorithms and criteria are adopted respectively, so that the accurate judgment of the single-phase earth fault phase is realized, and the judgment accuracy is improved.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a trace diagram of a zero-sequence voltage Un provided in the present application;
fig. 2 is a flowchart of a single-phase ground fault phase multi-parameter determination method according to an embodiment of the present application;
fig. 3 is a block diagram of a single-phase ground fault phase multi-parameter determination apparatus according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 2, an embodiment of the present application provides a single-phase ground fault phase multi-parameter discrimination method, including:
step 101, acquiring four parameters, wherein the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
102, performing Fourier operation on the three-phase voltage and the zero-sequence voltage to obtain a zero-sequence voltage fundamental wave amplitude;
103, dividing the zero sequence voltage fundamental wave amplitude according to voltage to obtain four regions;
and 104, judging the fault phase conditions of the zero sequence voltage in different areas.
Further, the four regions include a region greater than 70V, a region between 25V and 70V, a region between 15V and 25V, and a region less than 15V.
Further, the step of judging the fault phase condition of the zero sequence voltage in different regions includes:
step 201, judging which region the zero sequence voltage is in;
step 202, if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase;
step 203, if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the fundamental wave of the phase voltage is a fault phase;
step 204, if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude;
step 205, if the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase with the highest phase voltage fundamental wave amplitude is a fault phase;
step 206, if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again;
and step 207, if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
According to the technical scheme, the embodiment of the application provides the single-phase earth fault phase multi-parameter distinguishing method, the incidence relation of a plurality of system parameters is reasonably utilized, different areas are divided by utilizing zero sequence voltage, and proper, simple and reliable algorithms and criteria are adopted respectively, so that the accurate distinguishing of the single-phase earth fault phase is realized, and the distinguishing accuracy is improved.
Referring to fig. 3, an embodiment of the present application provides a single-phase ground fault phase multi-parameter distinguishing device, including:
the parameter acquisition unit 21 is used for acquiring four parameters, wherein the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
the operation unit 22 is configured to perform fourier operation on the three-phase voltage and the zero-sequence voltage to obtain a zero-sequence voltage fundamental wave amplitude;
the dividing unit 23 is configured to divide the zero sequence voltage fundamental amplitude according to the voltage to obtain four regions;
and the judging unit 24 is used for judging the fault phase conditions of the zero sequence voltage in different regions.
Further, the judging unit 24 is further configured to:
judging which region the zero sequence voltage is in; if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude; if the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase voltage fundamental wave with the highest amplitude is a fault phase; if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again; if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
According to the technical scheme, the embodiment of the application provides a single-phase earth fault phase multi-parameter distinguishing method and device, four parameters are collected firstly, the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system; then, carrying out Fourier operation on the three-phase voltage and the zero sequence voltage to obtain a zero sequence voltage fundamental wave amplitude; dividing the zero sequence voltage fundamental wave amplitude according to the voltage to obtain four regions; and finally, judging the fault phase conditions of the zero sequence voltage in different regions. According to the technical scheme, the incidence relation of a plurality of system parameters is reasonably utilized, different areas are divided by utilizing zero sequence voltage, and proper, simple and reliable algorithms and criteria are adopted respectively, so that the accurate judgment of the single-phase earth fault phase is realized, and the judgment accuracy is improved.
The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (2)
1. A single-phase earth fault phase multi-parameter distinguishing method is characterized by comprising the following steps:
acquiring four parameters, wherein the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
performing Fourier operation on the three-phase voltage and the zero-sequence voltage to obtain a zero-sequence voltage fundamental wave amplitude;
dividing the zero sequence voltage fundamental wave amplitude according to the voltage to obtain four regions; the four regions comprise a region greater than 70V, a region between 25V and 70V, a region between 15V and 25V, and a region less than 15V;
judging the fault phase conditions of the zero sequence voltage in different regions;
and the step of judging the fault phase condition of the zero sequence voltage in different areas comprises the following steps:
judging which region the zero sequence voltage is in;
if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase;
if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the phase voltage fundamental wave is a fault phase;
if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude;
if the phase voltage fundamental wave amplitude of the leading phase is the intermediate value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase voltage fundamental wave with the highest amplitude is a fault phase;
if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again;
if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
2. A single-phase earth fault phase multi-parameter discriminating device is characterized by comprising:
the device comprises a parameter acquisition unit, a parameter acquisition unit and a control unit, wherein the parameter acquisition unit is used for acquiring four parameters, the four parameters comprise three-phase voltage and zero-sequence voltage, and the three-phase voltage comprises voltage values of three phases in an arc suppression coil overcompensation grounding system;
the operation unit is used for carrying out Fourier operation on the three-phase voltage and the zero sequence voltage to obtain a zero sequence voltage fundamental wave amplitude;
the dividing unit is used for dividing the zero sequence voltage fundamental wave amplitude value according to voltage to obtain four regions; the four regions comprise a region greater than 70V, a region between 25V and 70V, a region between 15V and 25V, and a region less than 15V;
the judging unit is used for judging the fault phase conditions of the zero sequence voltage in different regions;
the judging unit is further configured to:
judging which region the zero sequence voltage is in; if the zero sequence voltage is in the area larger than 70V, the phase with the lowest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 25V and 70V, the phase with the highest amplitude of the phase voltage fundamental wave is a fault phase; if the zero sequence voltage is in the region between 15V and 25V, judging whether the phase voltage fundamental wave amplitude of the leading phase is the middle value of the three-phase voltage fundamental wave amplitude; if the phase voltage fundamental wave amplitude of the leading phase is the intermediate value of the three-phase voltage fundamental wave amplitude, the leading phase of the phase voltage fundamental wave with the highest amplitude is a fault phase; if the phase voltage fundamental wave amplitude of the leading phase is not the middle value of the three-phase voltage fundamental wave amplitude, acquiring four parameters again; if the zero sequence voltage is in the area smaller than 15V, no single-phase earth fault occurs in the arc suppression coil overcompensation grounding system.
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