CN108736435B - fault positioning method and device, positioning equipment and storage medium - Google Patents

fault positioning method and device, positioning equipment and storage medium Download PDF

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Publication number
CN108736435B
CN108736435B CN201810547219.1A CN201810547219A CN108736435B CN 108736435 B CN108736435 B CN 108736435B CN 201810547219 A CN201810547219 A CN 201810547219A CN 108736435 B CN108736435 B CN 108736435B
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fault
indicator
neutral point
fault indicator
grounding mode
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CN108736435A (en
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吴焕
张宏波
胡道徐
罗晓
窦乘国
陈致远
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SHANGHAI SIEYUAN HONGRUI AUTOMATION CO Ltd
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SHANGHAI SIEYUAN HONGRUI AUTOMATION CO Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured

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  • Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Locating Faults (AREA)

Abstract

The invention discloses a fault positioning method, a fault positioning device, positioning equipment and a storage medium. The method comprises the following steps: when the small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode; and positioning the low-current grounding fault in the power distribution network through each target fault indicator.

Description

fault positioning method and device, positioning equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of smart power grids, in particular to a fault positioning method, a fault positioning device, positioning equipment and a storage medium.
background
with the development of social economy, the structure of the power distribution network in China is more and more complex, and the scale is more and more huge. Specifically, a distribution network refers to an electric power network that receives electric energy from a transmission network or a regional power plant and distributes the electric energy to various users on site or step by step according to voltage through distribution facilities. The power distribution network is a link connecting a transmission network and power consumers, consists of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensators, a plurality of accessory facilities and the like, and plays a role in distributing electric energy in the power network.
the distribution network is classified according to voltage class, and can be divided into: a high-voltage distribution network (35-110KV), a medium-voltage distribution network (6-10KV) and a low-voltage distribution network (220-; classified according to the function of the power supply area, it can be classified into: urban distribution networks, rural distribution networks and factory distribution networks.
the neutral point grounding method is an electrical connection method between a neutral point of a three-phase ac power system and the ground. China 110kV and above power grids generally adopt a large-current grounding mode, namely: the neutral point is effectively grounded. The 6-35 kV power distribution network generally adopts a low-current grounding mode, namely: the neutral point is not effectively grounded. In recent years, two networks are transformed, so that the capacitance current of a 6-35 kV power distribution network in a medium-small city is greatly increased, and if effective measures are not taken, the safe operation of the power distribution network is endangered. With the development of power supply networks, especially the increasing number of users adopting cable lines, the single-phase grounding capacitance current of the system is increased continuously, and the single-phase grounding fault in the power grid is expanded into an accident.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
In the existing power distribution network, for a low-current ground fault, due to the reasons of weak fault current, unstable electric arc, influence of random factors and the like, the ground fault is difficult to locate, and a reliable fault locating method and a high-accuracy low-current ground fault locating device are lacked all the time. There is therefore a need to overcome this problem in some way as far as possible, but there is no effective solution in the prior art.
Disclosure of Invention
The invention provides a fault positioning method, a fault positioning device, positioning equipment and a storage medium, which can accurately position a low-current ground fault in a power distribution network.
in a first aspect, an embodiment of the present invention provides a fault location method, where the method includes:
When the small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
Determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method;
Determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
And positioning the low-current grounding fault in the power distribution network through each target fault indicator.
in a second aspect, an embodiment of the present invention further provides a fault location apparatus, where the apparatus includes: the device comprises a detection module, a determination module and a positioning module; wherein,
The detection module is used for determining a neutral point grounding mode in the power distribution network when the power distribution network is detected to have a low-current grounding fault; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
The determining module is used for determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
And the positioning module is used for positioning the low-current grounding fault in the power distribution network through each target fault indicator.
In a third aspect, an embodiment of the present invention provides a positioning apparatus, including:
one or more processors;
a memory for storing one or more programs,
When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the fault location method of any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a non-volatile computer storage medium storing computer-executable instructions, where the computer-executable instructions are configured to perform the fault location method according to any one of the above embodiments.
The embodiment of the invention provides a fault positioning method, a fault positioning device, positioning equipment and a storage medium, wherein when a small-current grounding fault of a power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning method, the fault positioning device, the positioning equipment and the storage medium provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
drawings
Fig. 1 is a flowchart of a fault location method according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a fault location method according to a second embodiment of the present invention;
Fig. 3 is a flowchart of a fault location method in a third embodiment of the present invention;
Fig. 4 is a flowchart of a fault location method according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fault location device in a fifth embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a positioning apparatus in a sixth embodiment of the present invention.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
example one
fig. 1 is a flowchart of a fault location method according to a first embodiment of the present invention. As shown in fig. 1, the fault location method may include the steps of:
step 101, when a small current grounding fault of a power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
In the specific embodiment of the invention, when the positioning equipment detects that the low-current grounding fault occurs in the power distribution network, the positioning equipment can determine a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded. Specifically, the non-effective grounding manner of the neutral point can be mainly classified into the following three manners: a neutral point ungrounded mode, a neutral point grounded mode through an arc suppression coil, and a neutral point grounded mode through a resistor. Specifically, the non-grounding mode of the neutral point refers to that the values of capacitance currents relative to the ground in the power distribution network are equal, the phase difference is 120 degrees, the vector sum is equal to zero, no capacitance current passes through the ground, and the neutral point is zero relative to the ground potential, namely the neutral point is consistent with the ground potential. At this time, whether the neutral point is grounded or not has no influence on the relative ground voltage. The neutral point is grounded in a small resistance mode, namely electromagnetic energy in intermittent arc overvoltage is released after a resistor is connected in series with the neutral point of the transformer, the potential of the neutral point is reduced, the rising speed of fault phase recovery voltage is also reduced, the possibility of electric arc restriking is reduced, the amplitude of the power grid overvoltage is restrained, and selective grounding protection is realized. The neutral point is grounded through the arc suppression coil, that is, when a single-phase ground fault occurs in the power distribution network, an inductive current which is approximately equal to the capacitance current of the ground but opposite to the capacitance current of the ground is formed, the inductive current with the lagging voltage of 90 degrees and the capacitance current with the leading voltage of 90 degrees are mutually compensated, and finally, the current flowing through the ground is enabled to be small to be equal to zero, so that the electric arc at the ground and the harm possibly caused by the electric arc are eliminated.
102, determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method.
In a specific embodiment of the present invention, the positioning device may determine a fault positioning algorithm corresponding to the neutral point according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method. Specifically, when the neutral point grounding mode is a neutral point grounding mode through a small resistor, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point grounding mode through the small resistor is a zero-sequence current amplitude comparison method; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment can determine that a fault positioning algorithm corresponding to the neutral point grounding mode through the arc suppression coil is a K value method; when the neutral point grounding mode is the neutral point non-grounding mode, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point non-grounding mode is a zero-sequence current similarity method.
And 103, determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode.
in a specific embodiment of the present invention, the positioning device may determine each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding manner. Specifically, when the neutral point grounding mode is a mode in which the neutral point is grounded through a small resistor, the positioning device can determine each target fault indicator in the power distribution network according to a zero-sequence current amplitude comparison method; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment can determine each target fault indicator in the power distribution network according to a K value method; when the neutral point grounding mode is the neutral point non-grounding mode, the positioning equipment can determine each target fault indicator in the power distribution network according to the zero sequence current similarity method.
and 104, positioning the low-current ground fault in the power distribution network through each target fault indicator.
In a specific embodiment of the present invention, after the positioning device determines each target fault indicator in the power distribution network, the positioning device may position the low-current ground fault in the power distribution network through each target fault indicator. Specifically, the positioning device may obtain a current value displayed in each target fault indicator, analyze the current value displayed in each target fault indicator, and position the low-current ground fault in the power distribution network according to an analysis result.
according to the fault positioning method provided by the embodiment of the invention, when the small current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning method provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
Example two
fig. 2 is a flowchart of a fault location method in the second embodiment of the present invention. As shown in fig. 2, the fault location method may include the steps of:
step 201, when a small current grounding fault of a power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
In the specific embodiment of the invention, when the positioning equipment detects that the low-current grounding fault occurs in the power distribution network, the positioning equipment can determine a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
Step 202, determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method.
In a specific embodiment of the present invention, the positioning device may determine a fault positioning algorithm corresponding to the neutral point according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method. Specifically, when the neutral point grounding mode is a neutral point grounding mode through a small resistor, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point grounding mode through the small resistor is a zero-sequence current amplitude comparison method; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment can determine that a fault positioning algorithm corresponding to the neutral point grounding mode through the arc suppression coil is a K value method; when the neutral point grounding mode is the neutral point non-grounding mode, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point non-grounding mode is a zero-sequence current similarity method.
and 203, when the neutral point grounding mode is a mode that the neutral point is grounded through a small resistor, if the zero-sequence current collected by each fault indicator at the preset first sampling time point is larger than a preset first threshold value, determining each fault indicator as each target fault indicator.
In an embodiment of the present invention, when the neutral point grounding mode is a neutral point grounding mode via a small resistor, the positioning device may determine whether zero-sequence current collected by each fault indicator at a preset first sampling time point is greater than a preset first threshold value. Specifically, when the small-current ground fault of the power distribution network is detected, the positioning device may determine, within a time point of 160ms after the small-current ground fault of the power distribution network is detected, whether zero-sequence current collected by each fault indicator at a preset first sampling time point is greater than a preset first threshold value, and when zero-sequence current collected by each fault indicator at each first collection time point is greater than the first threshold value, the positioning device may determine that each fault indicator is each target fault indicator.
And step 204, positioning the low-current ground fault in the power distribution network through each target fault indicator.
In a specific embodiment of the present invention, after the positioning device determines each target fault indicator in the power distribution network, the positioning device may position the low-current ground fault in the power distribution network through each target fault indicator. Specifically, the positioning device may obtain a current value displayed in each target fault indicator, analyze the current value displayed in each target fault indicator, and position the low-current ground fault in the power distribution network according to an analysis result.
According to the fault positioning method provided by the embodiment of the invention, when the small current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning method provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
EXAMPLE III
Fig. 3 is a flowchart of a fault location method in the third embodiment of the present invention. As shown in fig. 3, the fault location method may include the steps of:
Step 301, when a small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
In the specific embodiment of the invention, when the positioning equipment detects that the low-current grounding fault occurs in the power distribution network, the positioning equipment can determine a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
step 302, determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method.
In a specific embodiment of the present invention, the positioning device may determine a fault positioning algorithm corresponding to the neutral point according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method. Specifically, when the neutral point grounding mode is a neutral point grounding mode through a small resistor, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point grounding mode through the small resistor is a zero-sequence current amplitude comparison method; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment can determine that a fault positioning algorithm corresponding to the neutral point grounding mode through the arc suppression coil is a K value method; when the neutral point grounding mode is the neutral point non-grounding mode, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point non-grounding mode is a zero-sequence current similarity method.
and step 303, when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, calculating K values corresponding to the fault indicators and K values corresponding to downstream fault indicators of the fault indicators.
In an embodiment of the present invention, when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning device may calculate a K value corresponding to each fault indicator and a K value corresponding to a downstream fault indicator of each fault indicator. Wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: and the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point. In particular, the amount of the solvent to be used,Wherein N is the number of each second acquisition time point,Is the sum of the absolute values of the fault currents collected by the fault phase indicator at the respective second sampling time points,And the sum of the absolute values of the fault current collected by the two non-fault phase indicators corresponding to the fault phase indicators at the second sampling time points.
And step 304, calculating the absolute value of the K value change rate corresponding to each fault indicator according to the K value corresponding to each fault indicator and the K value corresponding to the downstream fault indicator of each fault indicator.
in a specific embodiment of the present invention, the positioning device may calculate an absolute value of a K value change rate corresponding to each fault indicator according to the K value corresponding to each fault indicator and the K value corresponding to the downstream fault indicator of each fault indicator. Specifically, the absolute value of the K value change rate corresponding to each fault indicator may be an absolute value of a ratio of a difference between the K value corresponding to the downstream fault indicator of each fault indicator and the K value corresponding to each fault indicator to the K value corresponding to each fault indicator. For example, assume that the K value corresponding to each fault indicator is K1, the K value corresponding to the downstream fault indicator of each fault indicator is K2, and the K value change rate corresponding to each fault indicator is: i K2-K1I/K1.
And 305, if the absolute value of the K value change rate corresponding to each fault indicator is greater than a preset second threshold value, determining each fault indicator as each target fault indicator.
in a specific embodiment of the present invention, the positioning device may determine whether an absolute value of a K value change rate corresponding to each fault indicator is greater than a preset second threshold; and when the absolute value of the K value change rate corresponding to each fault indicator is greater than the second threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
And step 306, positioning the low-current ground fault in the power distribution network through each target fault indicator.
in a specific embodiment of the present invention, after the positioning device determines each target fault indicator in the power distribution network, the positioning device may position the low-current ground fault in the power distribution network through each target fault indicator. Specifically, the positioning device may obtain a current value displayed in each target fault indicator, analyze the current value displayed in each target fault indicator, and position the low-current ground fault in the power distribution network according to an analysis result.
According to the fault positioning method provided by the embodiment of the invention, when the small current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning method provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
Example four
fig. 4 is a flowchart of a fault location method in the fourth embodiment of the present invention. As shown in fig. 4, the fault location method may include the steps of:
Step 401, when a small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
In the specific embodiment of the invention, when the positioning equipment detects that the low-current grounding fault occurs in the power distribution network, the positioning equipment can determine a neutral point grounding mode in the power distribution network; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded.
step 402, determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method.
In a specific embodiment of the present invention, the positioning device may determine a fault positioning algorithm corresponding to the neutral point according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method. Specifically, when the neutral point grounding mode is a neutral point grounding mode through a small resistor, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point grounding mode through the small resistor is a zero-sequence current amplitude comparison method; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment can determine that a fault positioning algorithm corresponding to the neutral point grounding mode through the arc suppression coil is a K value method; when the neutral point grounding mode is the neutral point non-grounding mode, the positioning device may determine that the fault positioning algorithm corresponding to the neutral point non-grounding mode is a zero-sequence current similarity method.
And step 403, when the neutral point grounding mode is a neutral point non-grounding mode, calculating the similarity coefficient corresponding to each fault indicator.
in the specific embodiment of the invention, when the neutral point grounding mode is the neutral point non-grounding mode, the positioning device can calculate the similarity coefficient corresponding to each fault indicator; wherein, each fault indicator corresponds to a similarity coefficientk is the number of each fault indicator; n is the number of preset third sampling time points; i.e. i0kZero sequence current collected at each third sampling time point for each fault indicator; i.e. i0kzAnd the zero sequence current collected at each third sampling time point is taken as the downstream indicator of each fault indicator.
and step 404, if the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value, determining that the upstream fault indicator of each fault indicator is each target fault indicator.
In a specific embodiment of the present invention, the positioning device may determine whether the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value; when the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value, the positioning device may determine that the upstream fault indicator of each fault indicator is each target fault indicator; when the similarity coefficient corresponding to each fault indicator is greater than or equal to the third threshold value, the positioning device may determine that the upstream fault indicator of each fault indicator is not the target fault indicator. If the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value, the positioning device may determine that the upstream fault indicator of each fault indicator is a target fault indicator.
And 405, positioning the low-current ground fault in the power distribution network through each target fault indicator.
In a specific embodiment of the present invention, after the positioning device determines each target fault indicator in the power distribution network, the positioning device may position the low-current ground fault in the power distribution network through each target fault indicator. Specifically, the positioning device may obtain a current value displayed in each target fault indicator, analyze the current value displayed in each target fault indicator, and position the low-current ground fault in the power distribution network according to an analysis result.
According to the fault positioning method provided by the embodiment of the invention, when the small current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning method provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
EXAMPLE five
fig. 5 is a schematic structural diagram of a fault location device in the fifth embodiment of the present invention. As shown in fig. 5, the apparatus includes: a detection module 501, a determination module 502 and a positioning module 503; wherein,
The detection module 501 is configured to determine a neutral point grounding mode in the power distribution network when a low-current ground fault of the power distribution network is detected; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
The determining module 502 is configured to determine a fault location algorithm corresponding to the neutral point grounding manner according to the neutral point grounding manner; wherein the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
the positioning module 503 is configured to position the low-current ground fault in the power distribution network through each target fault indicator.
Further, the determining module 502 is specifically configured to, when the neutral point grounding manner is a neutral point grounding manner via a small resistor, determine whether a zero-sequence current collected by each fault indicator at a preset first sampling time point is greater than a preset first threshold value; and when the zero sequence current acquired by each fault indicator is larger than the first threshold value, determining each fault indicator as each target fault indicator.
Further, the determining module 502 is specifically configured to calculate a K value corresponding to each fault indicator and a K value corresponding to a downstream fault indicator of each fault indicator when the neutral point grounding manner is the neutral point arc suppression coil grounding manner; calculating the absolute value of the K value change rate corresponding to each fault indicator according to the K value corresponding to each fault indicator and the K value corresponding to the downstream fault indicator of each fault indicator; wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point; judging whether the absolute value of the K value change rate corresponding to each fault indicator is larger than a preset second threshold value or not; and when the absolute value of the K value change rate corresponding to each fault indicator is greater than the second threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
further, the determining module 502 is specifically configured to calculate a similarity coefficient corresponding to each fault indicator when the neutral point grounding manner is the neutral point non-grounding manner; wherein, each fault indicator corresponds to a similarity coefficientk is the number of each fault indicator; n is the number of preset third sampling time points; i.e. i0kZero sequence current collected at each third sampling time point for each fault indicator; i.e. i0kzzero sequence current collected at each third sampling time point for the downstream indicator of each fault indicator; judging whether the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value or not; and when the similarity coefficient corresponding to each fault indicator is smaller than the preset third threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
according to the fault positioning device provided by the embodiment of the invention, when the small-current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the fault positioning device provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
EXAMPLE six
Fig. 6 is a schematic structural diagram of a positioning apparatus in a sixth embodiment of the present invention. FIG. 6 illustrates a block diagram of an exemplary positioning apparatus suitable for use in implementing embodiments of the present invention. The positioning device 12 shown in fig. 6 is only an example and should not bring any limitation to the function and scope of use of the embodiments of the present invention.
As shown in FIG. 6, the positioning device 12 is in the form of a general purpose computing device. The components of the positioning device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, micro-channel architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
pointing device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by positioning device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
the system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. The positioning device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 6, and commonly referred to as a "hard drive"). Although not shown in FIG. 6, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Positioning device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with positioning device 12, and/or with any devices (e.g., network card, modem, etc.) that enable positioning device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, the positioning device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with the other modules of the pointing device 12 via the bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the pointing device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing by executing programs stored in the system memory 28, for example, to implement the fault location method provided by the embodiment of the present invention.
According to the positioning equipment provided by the embodiment of the invention, when the small-current grounding fault of the power distribution network is detected, a neutral point grounding mode in the power distribution network is determined firstly; wherein, the neutral point grounding mode includes: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded; then determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein, the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method; and determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode, and finally positioning the low-current grounding fault in the power distribution network through each target fault indicator. That is to say, in the technical scheme of the present invention, each target fault indicator in the power distribution network may be determined according to different fault location algorithms corresponding to each neutral point grounding manner, and then the low-current ground fault in the power distribution network may be located by each target fault indicator. Therefore, compared with the prior art, the positioning equipment provided by the embodiment of the invention can accurately position the low-current ground fault in the power distribution network; moreover, the technical scheme of the embodiment of the invention is simple and convenient to realize, convenient to popularize and wider in application range.
EXAMPLE seven
The seventh embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the fault location method provided in all the embodiments of the present invention:
when the small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
Determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: zero-sequence current amplitude comparison method, K value method and zero-sequence current similarity method;
Determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
And positioning the low-current grounding fault in the power distribution network through each target fault indicator.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
it is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. a method of fault location, the method comprising:
When the small current grounding fault of the power distribution network is detected, determining a neutral point grounding mode in the power distribution network; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: the method comprises a zero-sequence current amplitude comparison method, a K value method and a zero-sequence current similarity method, wherein the K value method is a fault positioning algorithm corresponding to a neutral point grounding mode through an arc suppression coil determined by positioning equipment when the neutral point grounding mode is a neutral point grounding mode through the arc suppression coil; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment calculates K values corresponding to all fault indicators and K values corresponding to downstream fault indicators of all fault indicators; wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point; the K value in the K value method is obtained by the following formula:
Wherein N is the number of each second acquisition time point,The sum of absolute values of fault current collected by the fault phase indicator at each second sampling time point，The sum of the absolute values of the fault currents collected by the two non-fault phase indicators corresponding to the fault phase indicators at the second sampling time points is obtained;
determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
And positioning the low-current grounding fault in the power distribution network through each target fault indicator.
2. the method of claim 1, wherein determining each target fault indicator in the power distribution network according to the positioning algorithm corresponding to the neutral grounding mode comprises:
when the neutral point grounding mode is a mode that the neutral point is grounded through a small resistor, judging whether zero-sequence current acquired by each fault indicator at a preset first sampling time point is larger than a preset first threshold value or not;
And when the zero sequence current acquired by each fault indicator is larger than the first threshold value, determining each fault indicator as each target fault indicator.
3. The method of claim 1, wherein determining each target fault indicator in the power distribution network according to the positioning algorithm corresponding to the neutral grounding mode comprises:
When the neutral point grounding mode is the neutral point grounding mode through the arc suppression coil, calculating K values corresponding to all fault indicators and K values corresponding to downstream fault indicators of all fault indicators;
Calculating the absolute value of the K value change rate corresponding to each fault indicator according to the K value corresponding to each fault indicator and the K value corresponding to the downstream fault indicator of each fault indicator; wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point;
Judging whether the absolute value of the K value change rate corresponding to each fault indicator is larger than a preset second threshold value or not;
And when the absolute value of the K value change rate corresponding to each fault indicator is greater than the second threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
4. The method of claim 1, wherein determining each target fault indicator in the power distribution network according to the positioning algorithm corresponding to the neutral grounding mode comprises:
when the neutral point grounding mode is the neutral point non-grounding mode, calculating the similarity coefficient corresponding to each fault indicator; wherein, each fault indicator corresponds to a similarity coefficientk is the number of each fault indicator; n is the number of preset third sampling time points; i.e. i0kZero sequence current collected at each third sampling time point for each fault indicator; i.e. i0kzZero sequence current collected at each third sampling time point for the downstream indicator of each fault indicator;
Judging whether the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value or not;
and when the similarity coefficient corresponding to each fault indicator is smaller than the preset third threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
5. A fault locating device, characterized in that the device comprises: the device comprises a detection module, a determination module and a positioning module; wherein,
The detection module is used for determining a neutral point grounding mode in the power distribution network when the power distribution network is detected to have a low-current grounding fault; wherein the neutral grounding scheme comprises: the neutral point is grounded through a small resistor, grounded through an arc suppression coil and ungrounded;
The determining module is used for determining a fault positioning algorithm corresponding to the neutral point grounding mode according to the neutral point grounding mode; wherein the positioning algorithm comprises: the method comprises a zero-sequence current amplitude comparison method, a K value method and a zero-sequence current similarity method, wherein the K value method is a fault positioning algorithm corresponding to a neutral point grounding mode through an arc suppression coil determined by positioning equipment when the neutral point grounding mode is a neutral point grounding mode through the arc suppression coil; when the neutral point grounding mode is a neutral point grounding mode through an arc suppression coil, the positioning equipment calculates K values corresponding to all fault indicators and K values corresponding to downstream fault indicators of all fault indicators; wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point; the K value in the K value method is obtained by the following formula:
wherein N is the number of each second acquisition time point,Is the sum of the absolute values of the fault currents collected by the fault phase indicator at the respective second sampling time points,The sum of the absolute values of the fault currents collected by the two non-fault phase indicators corresponding to the fault phase indicators at the second sampling time points is obtained; determining each target fault indicator in the power distribution network according to a positioning algorithm corresponding to the neutral point grounding mode;
And the positioning module is used for positioning the low-current grounding fault in the power distribution network through each target fault indicator.
6. The apparatus of claim 5, wherein:
the determining module is specifically configured to, when the neutral point grounding mode is a mode in which the neutral point is grounded via a small resistor, determine whether zero-sequence current collected by each fault indicator at a preset first sampling time point is greater than a preset first threshold value; and when the zero sequence current acquired by each fault indicator is larger than the first threshold value, determining each fault indicator as each target fault indicator.
7. the apparatus of claim 5, wherein:
The determining module is specifically configured to calculate a K value corresponding to each fault indicator and a K value corresponding to a downstream fault indicator of each fault indicator when the neutral point grounding mode is the neutral point grounding mode through the arc suppression coil; calculating the absolute value of the K value change rate corresponding to each fault indicator according to the K value corresponding to each fault indicator and the K value corresponding to the downstream fault indicator of each fault indicator; wherein each fault indicator comprises: a faulted phase indicator and two non-faulted phase indicators; the K value corresponding to each fault indicator is as follows: the ratio of the sum of the absolute values of the fault current collected by each fault phase indicator at each preset second sampling time point to the sum of the absolute values of the fault current collected by two non-fault phase indicators corresponding to the fault phase indicator at each second sampling time point; judging whether the absolute value of the K value change rate corresponding to each fault indicator is larger than a preset second threshold value or not; and when the absolute value of the K value change rate corresponding to each fault indicator is greater than the second threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
8. The apparatus of claim 5, wherein:
The determining module is specifically configured to calculate a similarity coefficient corresponding to each fault indicator when the neutral point grounding mode is the neutral point non-grounding mode; wherein, each fault indicator corresponds to a similarity coefficientk is the number of each fault indicator; n is the number of preset third sampling time points; i.e. i0kZero sequence current collected at each third sampling time point for each fault indicator; i.e. i0kzzero sequence current collected at each third sampling time point for the downstream indicator of each fault indicator; judging whether the similarity coefficient corresponding to each fault indicator is smaller than a preset third threshold value or not; and when the similarity coefficient corresponding to each fault indicator is smaller than the preset third threshold value, determining the upstream fault indicator of each fault indicator as each target fault indicator.
9. A positioning apparatus, comprising:
One or more processors;
A memory for storing one or more programs,
When executed by the one or more processors, cause the one or more processors to implement the fault localization method of any of claims 1-4.
10. A non-transitory computer storage medium storing computer-executable instructions for performing the fault location method of any one of claims 1 to 4.
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