CN106154118B - Power distribution network single-phase earth fault line selection and positioning device and method - Google Patents
Power distribution network single-phase earth fault line selection and positioning device and method Download PDFInfo
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- CN106154118B CN106154118B CN201610864098.4A CN201610864098A CN106154118B CN 106154118 B CN106154118 B CN 106154118B CN 201610864098 A CN201610864098 A CN 201610864098A CN 106154118 B CN106154118 B CN 106154118B
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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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- 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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Abstract
The invention relates to the ground fault detection technology of the electric power system, relate to a single-phase ground fault line selection of distribution network and locating device and method specifically, including bus bar of the transformer substation, transformer substation and distribution network transmission line, characterized by that, also include installing the traditional zero sequence current mutual inductor in every feeder line leading-out terminal of the bus bar of the transformer substation, install the carrier signal source of zero sequence current in every regional sectional node of every transmission line of distribution network, install the carrier signal receiver of zero sequence current on the bus bar of the transformer substation, install the arc suppression coil in the transformer substation; the traditional zero sequence current transformer collects zero sequence current signals of the head end of each power distribution network power transmission line and is used for single-phase earth fault line selection; the zero sequence current carrier signal source collects the zero sequence current signal of each regional sectional node and is used for positioning the single-phase grounding fault point. The device can accurately and reliably locate the fault point, and the adopted method is simple to realize and has small influence on the power grid.
Description
Technical Field
The invention belongs to the technical field of ground fault detection of power systems, and particularly relates to a single-phase ground fault line selection and positioning device and method for a power distribution network.
Background
In a 10kV/35kV power distribution network, a single-phase earth fault accounts for 70% -80% of total faults of a line, and is the most common fault of a power distribution system. The accurate and reliable line selection and positioning of the single-phase earth fault point of the power distribution network are necessary.
At present, three methods are mainly used for positioning and researching fault points of the power distribution network at home and abroad:
1. the method for locating the fault by using the outdoor fault detector is characterized in that a fault section is determined by detecting the difference of fault information before and after a fault point. The fault indicator of the overhead line is a device for detecting a fault point based on a magnetic field generated by measuring zero sequence current of the line, but the detection accuracy of the method is not high because the magnetic field distribution of the zero sequence current is also related to the capacitance distribution of a power grid.
2. And measuring the voltage and current at the end point of the line during fault, and judging the fault distance by calculation and analysis. The common impedance method only has a reference function due to the complex distribution network line, uneven line impedance parameters and the like.
3. And the signal injection method for fault positioning is realized by injecting signals into the system. The method increases a high-frequency signal source at the head end of the line, realizes fault location according to the frequency, phase and waveform characteristics of the transfer function frequency spectrum of each branch port, has limited fault detection effect due to longer actual distribution network line and signal attenuation and the like, and is limited in practical popularization and application.
However, the above typical methods for positioning the fault point of the power distribution network have the problems of influence on the power distribution network, low positioning accuracy, inaccuracy and the like.
Disclosure of Invention
The invention aims to provide a device capable of accurately and reliably selecting and positioning a single-phase earth fault point of a power distribution network.
The second purpose of the invention is to provide a method for accurately and reliably positioning and selecting a line for a fault point, which is simple and has little influence on a power grid.
In order to achieve the first purpose, the invention adopts the technical scheme that: a single-phase earth fault line selection and positioning device for a power distribution network comprises a substation bus, a substation transformer and a power distribution network transmission line, and further comprises a traditional zero sequence current transformer installed at the outgoing line end of each feeder line of the substation bus, a zero sequence current carrier signal source installed at each regional sectional node of each power distribution network transmission line, a zero sequence current carrier signal receiver installed on the substation bus, and an arc suppression coil installed at the substation transformer; the traditional zero sequence current transformer collects zero sequence current signals of the head end of each return line and is used for selecting a single-phase earth fault; the zero sequence current carrier signal source collects the zero sequence current signal of each regional sectional node and is used for positioning the single-phase grounding fault point.
In the above-mentioned single-phase earth fault line selection and positioning device for the power distribution network, the zero-sequence current carrier signal source at each regional sectional node selects modulation signals with different frequencies, the frequency range is from tens of kHZ to hundreds of kHZ, and the closer the line regional sectional node zero-sequence current carrier signal source is to the transformer substation, the higher the frequency is; the farther away from the transformer substation, the lower the frequency of the zero sequence current carrier signal source of the segment node of the line region.
In the single-phase earth fault line selection and positioning device for the power distribution network, the number of the power transmission line area segments is determined according to the fault positioning precision and the actual requirement.
In order to achieve the second purpose, the invention adopts the technical scheme that: the method for line selection and positioning of the single-phase earth fault of the power distribution network and the line selection and positioning device comprises the following steps:
s1, single-phase earth fault line selection of a power distribution network;
installing a traditional zero sequence current transformer at each feeder line outlet end of a substation bus, transmitting a zero sequence current power frequency signal of the traditional zero sequence current transformer to a substation detection device through a secondary circuit of the traditional zero sequence current transformer, and judging a line with a single-phase earth fault through the zero sequence current signal;
s2, positioning a single-phase grounding fault point of the power distribution network; the method comprises the following steps:
s21, performing regional segmentation on each power transmission line of the power distribution network according to positioning accuracy and actual requirements, installing a zero-sequence current carrier signal source at each regional segmentation node, and selecting different frequency modulation signals from the zero-sequence current carrier signal source installed at each regional segmentation node, wherein the frequency range is from tens of kHz to hundreds of kHz; the closer the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the higher the frequency is, and the farther the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the lower the frequency is;
s22, detecting the amplitude and phase information of the zero-sequence current of each node by acquiring the zero-sequence current of each segmented node and transmitting the amplitude and phase information of the zero-sequence current to a zero-sequence current carrier signal receiver of the transformer substation based on a carrier principle;
and S23, after arc suppression coil compensation, changing the amplitude and the phase of the zero-sequence current between the fault point and the transformer substation, and positioning the single-phase grounding fault point of the line by analyzing the amplitude and phase change information of the zero-sequence current of each section node detected by the transformer substation.
The invention has the beneficial effects that: the method can accurately and reliably position the fault point of the power distribution network, is simple to realize, and has little influence on the power distribution network.
Drawings
FIG. 1 is a diagram of two groups of outlet systems of a 10kV/35kV bus according to an embodiment of the present invention;
fig. 2 is a topology structure diagram of a zero-sequence current carrier signal source according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. They are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials. In addition, the structure of a first feature described below as "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "connected" and "connecting" should be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme adopted by the following embodiment is as follows: a single-phase earth fault line selection and positioning device for a power distribution network comprises a substation bus, a substation transformer and power distribution network transmission lines, and further comprises a traditional zero sequence current transformer installed at each feeder line outlet end of the substation bus, a zero sequence current carrier signal source installed at each regional sectional node of each power transmission line of the power distribution network, a zero sequence current carrier signal receiver installed on the substation bus, and an arc suppression coil installed at the substation transformer; the traditional zero sequence current transformer collects zero sequence current signals of the head end of each return line and is used for selecting a single-phase earth fault; the zero sequence current carrier signal source collects the zero sequence current signal of each regional sectional node and is used for positioning the single-phase grounding fault point.
In the above-mentioned single-phase earth fault line selection and positioning device for the power distribution network, the zero-sequence current carrier signal source at each regional sectional node selects modulation signals with different frequencies, the frequency range is from tens of kHZ to hundreds of kHZ, and the closer the line regional sectional node zero-sequence current carrier signal source is to the transformer substation, the higher the frequency is; the farther away from the transformer substation, the lower the frequency of the zero sequence current carrier signal source of the segment node of the line region. And the number of the power transmission line area segments is determined according to the fault positioning precision and the actual requirement.
The method for line selection and positioning of the single-phase earth fault and positioning device of the power distribution network comprises the following steps:
s1, single-phase earth fault line selection of a power distribution network;
installing a traditional zero sequence current transformer at each feeder line outgoing end of a substation bus, sending a zero sequence current power frequency signal of the traditional zero sequence current transformer to a substation detection device through a secondary circuit of the traditional zero sequence current transformer, and judging a line with a single-phase earth fault through the zero sequence current signal;
s2, positioning a single-phase grounding fault point of the power distribution network; the method comprises the following steps:
s21, performing regional segmentation on each power transmission line of the power distribution network according to positioning accuracy and actual requirements, installing a zero-sequence current carrier signal source at each regional segmentation node, and selecting different frequency modulation signals from the zero-sequence current carrier signal source installed at each regional segmentation node, wherein the frequency range is from tens of kHz to hundreds of kHz; the closer the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the higher the frequency is, and the farther the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the lower the frequency is;
s22, detecting the amplitude and phase information of the zero-sequence current of each node by acquiring the zero-sequence current of each segmented node and transmitting the amplitude and phase information of the zero-sequence current to a zero-sequence current carrier signal receiver of the transformer substation based on a carrier principle;
and S23, after arc suppression coil compensation, changing the amplitude and the phase of the zero-sequence current between the fault point and the transformer substation, and positioning the single-phase grounding fault point of the line by analyzing the amplitude and phase change information of the zero-sequence current of each section node detected by the transformer substation.
Example 1
As shown in fig. 1, in a specific implementation, a conventional zero sequence current transformer is installed at each feeder line outgoing end of a substation bus, and zero sequence current signals at the head end of each return line are collected to select a single-phase ground fault.
Because the transmission line of the power distribution network is longer, each loop circuit is subjected to area segmentation, and the number of the area segmentation is determined by the required fault positioning precision and the actual requirement. A zero-sequence current carrier signal source is installed at each regional sectional node, zero-sequence current of each regional sectional node is extracted through the zero-sequence current carrier signal source, amplitude and phase information of the zero-sequence current of the node is transmitted to a zero-sequence current carrier signal receiver installed in a transformer substation on the basis of a carrier principle, and the zero-sequence current phase and amplitude information of each node can be acquired at the transformer substation. Because zero sequence current amplitude and phase between the fault point and the transformer substation can change after arc suppression coil compensation, the single-phase grounding fault point of the power distribution network transmission line can be positioned by analyzing amplitude and phase change information of zero sequence current of each node acquired by the transformer substation. The zero sequence current carrier signal sources at the segment nodes in different areas of each line have different frequencies, and the frequency band ranges are as follows: tens of kHZ to hundreds of kHZ, the closer the line node to the substation, the higher the carrier frequency, and the farther the line node from the substation, the lower the carrier frequency, in order to avoid the mixing phenomenon.
As shown in fig. 2, the zero-sequence current carrier signal source may convert a zero-sequence current signal into a high-frequency carrier signal, and may transmit the high-frequency carrier signal to the bus signal receiver through the circuit of the line and the ground. The high-frequency carrier signal contains amplitude and phase information of the zero-sequence current. By sending PWM high-frequency control signals with different frequencies, the zero-sequence current carrier signal source can generate carrier signals with different frequencies.
The principle of embodiment 1 is explained below with reference to fig. 1:
in fig. 1, a structure diagram of a single-phase grounding line selection and positioning device of a power distribution network is drawn by taking two groups of outgoing lines of a 10kV/35kV bus, a line 1 and a line m as examples.
The traditional zero sequence current transformer 1 and the traditional zero sequence current transformer m are arranged at the head end of each group of power grid transmission lines, and zero sequence currents at the head ends of the line 1 and the line m can be detected respectively.
Each line of the power distribution network is divided into n areas, and a zero sequence current carrier signal source 1-n and a zero sequence current carrier signal source m-1-m-n on a line m are installed at each area subsection node. The zero sequence current carrier signal sources can convert zero sequence current signals into high frequency carrier signals. According to different lengths of the lines, the lines can be divided into different numbers of areas according to requirements, namely n of each line can be different.
In order to avoid the frequency mixing phenomenon, the zero sequence current carrier signal source at the subsection node of different areas of each power distribution network power transmission line selects modulation signals with different frequencies, and the frequency ranges are as follows: the frequency of line nodes closer to the substation is higher, and the frequency of line nodes farther from the substation is lower. Namely for each frequency in the figure:
f 1 ＞f 2 ＞···＞f n (1)
because the circuit, the ground and the bus can form a loop after the fault occurs, the high-frequency carrier signal can be transmitted to a bus receiver to be received, and the phase and amplitude information of each node can be extracted.
The transformer substation is provided with the arc suppression coil, zero sequence current of a line between a fault point and a bus can be compensated by adjusting the arc suppression coil, so that amplitude and phase information of the zero sequence current between the bus and the fault point can be changed, and based on the change information, the fault point can be positioned by analyzing and extracting amplitude and phase change information of zero sequence current signals of each node.
Example 2
Assume that line 1 is divided into 7 zone segments, i.e. n =7 for line 1. The signal frequency of the zero sequence current carrier signal source of each regional sectional node is respectively f 1 ＝100kHz、f 2 ＝90kHz、f 3 ＝80kHz、f 4 ＝70kHz、f 5 ＝60kHz、f 6 ＝50kHz、f 7 ＝40kHz。
Assume now that a single-phase ground fault occurs in zone 3 of line 1. By adjusting arc suppression coil compensation, zero sequence current amplitude and phase between a fault point and a bus can be changed, namely, in the figure, the amplitude and the phase of a traditional zero sequence current transformer 1, a zero sequence current carrier signal source 1-2 and a zero sequence current carrier signal source 1-3 can be changed.
Through the zero sequence current information detected by the traditional zero sequence current transformers 1-m, the situation that the single-phase earth fault occurs on the line 1 can be judged.
By analyzing the high-frequency carrier signal extracted by the bus signal receiver, the frequency f can be found 7 ～f 4 The amplitude and the phase of the high-frequency carrier signal between 40 and 70kHZ are not changed; frequency greater than50kHZ (i.e. frequency greater than f) 3 ) The amplitude and phase of the high-frequency carrier signal are changed, and the fault point can be judged to be in the area 3 of the line 1.
It should be understood that parts of the specification not set forth in detail are of the prior art.
Although specific embodiments of the present invention have been described above with reference to the accompanying drawings, it will be appreciated by those skilled in the art that these are merely illustrative and that various changes or modifications may be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is limited only by the appended claims.
Claims (2)
1. A single-phase earth fault line selection and positioning device for a power distribution network comprises a substation bus, a substation transformer and power distribution network transmission lines, and is characterized by also comprising a traditional zero sequence current transformer installed at each feeder line outlet end of the substation bus, a zero sequence current carrier signal source installed at each regional sectional node of each power distribution network transmission line, a zero sequence current carrier signal receiver installed on the substation bus, and an arc suppression coil installed at the substation transformer; the traditional zero sequence current transformer collects zero sequence current signals at the head end of each return line and is used for selecting a single-phase earth fault; the zero-sequence current carrier signal source collects a zero-sequence current signal of each regional sectional node and is used for positioning a single-phase grounding fault point;
the zero-sequence current carrier signal source at each regional sectional node selects modulation signals with different frequencies, the frequency range is from tens of kHZ to hundreds of kHZ, and the closer the zero-sequence current carrier signal source to the transformer substation, the higher the frequency of the zero-sequence current carrier signal source at the line regional sectional node; the farther a line region sectional node from a transformer substation is, the lower the frequency of a zero-sequence current carrier signal source is;
and the number of the power transmission line area segments is determined according to the fault positioning precision and the actual requirement.
2. The method for line selection and positioning of the single-phase earth fault of the power distribution network according to claim 1, characterized by comprising the following steps:
s1, single-phase earth fault line selection of a power distribution network;
installing a traditional zero sequence current transformer at each feeder line outlet end of a substation bus, transmitting a zero sequence current power frequency signal of the traditional zero sequence current transformer to a substation detection device through a secondary circuit of the traditional zero sequence current transformer, and judging a line with a single-phase earth fault through the zero sequence current signal;
s2, positioning a single-phase grounding fault point of the power distribution network; the method comprises the following steps:
s21, performing regional segmentation on each power transmission line of the power distribution network according to positioning accuracy and actual requirements, installing a zero-sequence current carrier signal source at each regional segmentation node, and selecting different frequency modulation signals from the zero-sequence current carrier signal source installed at each regional segmentation node, wherein the frequency range is from tens of kHz to hundreds of kHz; the closer the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the higher the frequency is, and the farther the line region sectional node zero-sequence current carrier signal source to the transformer substation is, the lower the frequency is;
s22, detecting the amplitude and phase information of the zero-sequence current of each node by acquiring the zero-sequence current of each segmented node and transmitting the amplitude and phase information of the zero-sequence current to a zero-sequence current carrier signal receiver of the transformer substation based on a carrier principle;
and S23, after arc suppression coil compensation, changing the amplitude and the phase of the zero-sequence current between the fault point and the transformer substation, and positioning the single-phase grounding fault point of the line by analyzing the amplitude and phase change information of the zero-sequence current of each section node detected by the transformer substation.
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| CN106959402A (en) * | 2017-05-03 | 2017-07-18 | 国网安徽省电力公司培训中心 | A kind of Little Current Ground Connection System and determination methods |
| CN108872779A (en) * | 2017-08-28 | 2018-11-23 | 武汉都市环保工程技术股份有限公司 | A kind of single-phase earth fault line selection device and method |
| CN107966633B (en) * | 2017-11-15 | 2021-05-18 | 国网宁夏电力公司电力科学研究院 | Method and system for rapidly judging single-phase earth fault line of power distribution network of power supply system |
| CN107942203B (en) * | 2018-01-09 | 2020-02-07 | 济南大学 | Low-current grounding line selection method for enhancing fault characteristics |
| CN109444565B (en) * | 2018-05-24 | 2020-03-17 | 天津大学 | Single-phase permanent fault identification method based on voltage phase fluctuation characteristics |
| CN109557419B (en) * | 2018-12-13 | 2020-11-06 | 国网山西省电力公司大同供电公司 | Power transmission line detection method |
| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN114089107B (en) * | 2021-11-16 | 2023-12-22 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for single-phase grounding fault handling of transformer substation center point grounding |
| CN114252720B (en) * | 2021-12-22 | 2023-08-22 | 广东电网有限责任公司 | Bus fault diagnosis method and device, computer equipment and storage medium |
| CN117375247A (en) * | 2023-12-07 | 2024-01-09 | 武汉中楚柏泰智能科技有限公司 | Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203054157U (en) * | 2012-12-04 | 2013-07-10 | 北京中天新业电气有限公司 | Power distribution network single-phase ground fault section wireless positioning system utilizing zero sequence signal method |
| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
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| CN104155582B (en) * | 2014-08-29 | 2016-10-19 | 上海交通大学 | Distribution line fault section location method based on Full wave shape information |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203054157U (en) * | 2012-12-04 | 2013-07-10 | 北京中天新业电气有限公司 | Power distribution network single-phase ground fault section wireless positioning system utilizing zero sequence signal method |
| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
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