CN116973680B - Low-current grounding line selection device, system and fault line investigation method - Google Patents
Low-current grounding line selection device, system and fault line investigation method Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
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- 238000013024 troubleshooting Methods 0.000 claims description 8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
A small-current grounding line selection device, a small-current grounding line selection system and a fault line investigation method are provided, wherein the device comprises N Hall sensors, plug-in connectors, an analog-to-digital conversion module, a control module and an output module; the input ends of the plug-in type connectors are connected to the voltage terminal rows, the input ends of the N Hall sensors are respectively connected to the current terminal rows, and M lines are traversed; the Hall sensor is used for clamping interval zero sequence current, the plug-in type connector is used for introducing bus zero sequence voltage, and the analog-to-digital conversion module converts the input analog current and voltage into digital current and voltage signals and transmits the digital current and voltage signals to the control module; the control module selects m current signals with the largest current amplitude from the sampled current signals, determines a line corresponding to the current signals with the phase difference between the voltage signals and the current signals in the phase difference threshold range as a fault line, and outputs the fault line through the output module. The scheme can shorten the fault checking time and improve the accuracy of fault line checking.
Description
Technical Field
The invention relates to the technical field of operation and maintenance of power grids, in particular to a low-current grounding line selection device, a low-current grounding line selection system and a fault line investigation method.
Background
For a long time, the cooperation of checking the 10kV ground fault line is always the key work of relay protection. In actual operation and maintenance, the troubleshooting work of the ground fault line often needs to take a long time, and especially for a substation with a remote part of the way, the troubleshooting time often exceeds the two-hour limit specified in the scheduling procedure. In addition, for alarming of the multi-line sharing condition, maintenance personnel are often required to switch off in sequence to conduct fault investigation, and the investigation time is further increased. The longer the fault investigation time is, the greater the potential risk faced by the power system is, the power supply reliability of the power grid is seriously affected, and the electricity utilization experience of a user is damaged.
Disclosure of Invention
In view of the above, it is necessary to provide a low-current grounding line selection device, a low-current grounding line selection system and a fault line checking method, so as to shorten the fault checking time of the grounding line, improve the accuracy of fault line checking, and further provide the power supply reliability of the power grid.
In a first aspect, an embodiment of the present invention provides a low-current grounding line selection device, including: the device comprises N Hall sensors, a plug-in connector, an analog-to-digital conversion module, a control module and an output module;
The output ends of the N Hall sensors are connected to the analog-to-digital conversion module, and the output ends of the plug-in connectors are connected to the analog-to-digital conversion module; the analog-to-digital conversion module and the output module are electrically connected to the control module;
the input ends of the plug-in type connectors are used for being connected to terminal wires of voltage terminal rows of bus zero sequence voltage when faults of the lines to be detected formed by M lines are detected, the input ends of the N Hall sensors are used for being respectively connected to the terminal wires of current terminal rows of the lines to be detected, and when M is more than or equal to N, the connected terminal wires of the current terminal rows are replaced to realize traversal of the M lines; the Hall sensor is used for transmitting the interval zero-sequence currents of M analog quantities on the clamped current terminal strip to the analog-to-digital conversion module, the plug-in connector is used for transmitting the bus zero-sequence voltage on the voltage terminal strip to the analog-to-digital conversion module, the analog-to-digital conversion module converts the interval zero-sequence currents of the M analog quantities into current signals of M digital quantities, converts the bus zero-sequence voltage of the analog quantities into voltage signals of the digital quantities, and transmits the current signals of the M digital quantities and the voltage signals of the digital quantities to the control module; the control module is used for selecting top M current signals with the largest current amplitude from the M digital current signals, and judging whether the phase difference between the digital voltage signals and the top M current signals is in a preset phase difference threshold range or not respectively; and determining a line corresponding to the current signal in the phase difference threshold range as a fault line, and outputting the fault line through the output module; wherein M is greater than or equal to M.
Preferably, the output module includes: the display module is electrically connected with the control module;
the control module is used for displaying the circuit corresponding to the current signal in the preset phase difference threshold range to a user through the display module.
Preferably, the control module is further configured to display, to a user, M interval zero sequence currents transmitted by the hall sensor and a bus zero sequence voltage transmitted by the plug-in connector through the display module.
Preferably, the apparatus further comprises: the alarm module is electrically connected with the control module;
And the control module is used for controlling the alarm module to send an alarm signal when judging that the phase difference of the line is in the phase difference threshold range so as to prompt a user to detect the fault line.
Preferably, the apparatus further comprises: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with a power grid control system;
the control module is used for transmitting the troubleshooting process and the relevant data of the troubleshooting result to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
In a second aspect, an embodiment of the present invention further provides a low-current grounding line selection system, including: the low-current ground line selection device, the current terminal block, the voltage terminal block, the current transformer, and the voltage transformer according to any one of the first aspect;
The current transformer converts primary large current of M lines into secondary small current through electromagnetic induction, and the secondary large current is introduced to corresponding terminal connecting wires on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary high voltage into a terminal connecting wire on the voltage terminal strip;
The input ends of the Hall sensors of the small-current grounding line selection device are respectively connected with M terminal wiring lines on the current terminal block in sequence and are used for clamping secondary zero sequence current to be input into the device; the input end of the plug-in connector of the low-current grounding line selection device is connected to the terminal connection wire of the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device, and the low-current grounding line selection device carries out analog-to-digital conversion on the input secondary zero sequence current and the bus zero sequence voltage and outputs a line with faults after logic judgment.
In a third aspect, an embodiment of the present invention further provides a fault line investigation method, where an implementation main body is a low-current grounding line selection device as in the first aspect, and the method includes the following steps:
step 1: connecting the input ends of plug-in connectors of a low-current grounding line selection device to terminal wires of voltage terminal rows corresponding to lines to be tested, which are formed by M lines, and connecting the input ends of N Hall sensors to the terminal wires of current terminal rows of the lines to be tested;
step 2: the small-current grounding line selection device acquires zero sequence currents of the M lines and corresponding bus zero sequence voltages by traversing terminal wiring on current terminal bars corresponding to the M lines;
Step 3: the low-current grounding line selection device determines a line with faults according to the collected zero sequence currents of M lines and the collected zero sequence voltages of buses.
Preferably, the step 3 specifically includes:
Sequencing the collected M zero sequence currents according to the sequence from the large current amplitude to the small current amplitude;
Determining a line corresponding to top m zero sequence currents with maximum current amplitudes positioned in front after sequencing as a suspicious line; wherein M is more than or equal to M;
Respectively judging whether the phase difference between the bus zero sequence voltage and the zero sequence currents of the m suspicious lines is positioned between preset phase difference threshold ranges;
and determining the line with the phase difference between the preset phase difference threshold ranges in the suspicious lines as the line with the fault.
Preferably, the phase difference threshold range is [ 90.+ -. 5] degrees.
Preferably, the low-current grounding line selection device prompts a user through the display module and the alarm module after determining a line with a fault.
According to the technical scheme, the low-current grounding line selection device provided by the embodiment of the invention comprises N Hall sensors, plug-in connectors, an analog-to-digital conversion module, a control module and an output module, when fault line investigation is carried out, the input ends of the Hall sensors are connected to the terminal connection wires of the current terminal strip, and the input ends of the plug-in connectors are connected to the terminal connection wires of the voltage terminal strip, so that the interval zero sequence currents of the lines can be collected simultaneously, and the line selection time can be shortened. Further, after the interval zero sequence current and the bus zero sequence voltage of all the lines are collected, the lines which are possibly broken down are further determined by the control module through analyzing the amplitude of the zero sequence current after the analog-to-digital conversion is further carried out on the lines which are further carried out on the lines through the analog-to-digital conversion module, and then the lines which are possibly broken down are further determined from the lines which are possibly broken down according to the phase difference, so that the judging accuracy of the broken down lines can be improved through two-stage judgment, and the line selecting accuracy of the broken down lines is further improved. In addition, the Hall sensor and the plug-in type connector are adopted in the scheme, so that the instant check can be realized, the operation is convenient and quick, and the wiring time during fault check is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a small current grounding line selection device according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an acquisition port of a low-current grounding line selection device according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a low-current grounding line selection system according to an embodiment of the present invention;
fig. 4 is a flowchart of a fault line investigation method according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1-2, an embodiment of the present invention provides a low-current grounding line selection device, including: the device comprises N Hall sensors, a plug-in connector, an analog-to-digital conversion module, a control module and an output module;
The output ends of the N Hall sensors are connected to the analog-to-digital conversion module, and the output ends of the plug-in connectors are connected to the analog-to-digital conversion module; the analog-to-digital conversion module and the output module are electrically connected to the control module;
The input ends of the plug-in type connectors are used for being connected to terminal wires of voltage terminal rows of zero sequence voltage of a bus when faults of the lines to be detected formed by M lines are detected, the input ends of the N Hall sensors are respectively connected to the terminal wires of current terminal rows of the lines to be detected, and when M is more than or equal to N, the connected terminal wires of the current terminal rows are replaced to realize the traversal of the M lines; the Hall sensor is used for transmitting M analog quantity interval zero sequence currents on the clamped current terminal strip to the analog-to-digital conversion module, the plug-in connector is used for transmitting the bus zero sequence voltage on the voltage terminal strip to the analog-to-digital conversion module, the analog-to-digital conversion module converts the input M analog quantity interval zero sequence currents into M digital quantity current signals, converts the analog quantity bus zero sequence voltage into digital quantity voltage signals, and transmits the M digital quantity current signals and the digital quantity voltage signals to the control module; the control module is used for selecting top M current signals with the largest current amplitude from the M digital current signals, and respectively judging whether the phase difference between the digital voltage signals and the top M current signals is in a preset phase difference threshold range or not; and determining a line corresponding to the current signal in the phase difference threshold range as a fault line, and outputting the fault line through an output module; wherein M is greater than or equal to M.
In the embodiment of the invention, the analog-to-digital conversion module, the control module and the output module are integrated in a PCB circuit board, the outside of the PCB circuit board is assembled through a shell, a voltage acquisition port and a plurality of current acquisition ports which are connected with the analog-to-digital conversion module are arranged on the shell, the Hall sensor is connected with the current acquisition ports, and the plug-in connector is connected with the voltage acquisition ports.
In this embodiment, the analog-to-digital conversion module adopts the AD7663 chip as a main component for circuit design, and the AD7663 chip has the advantages of high sampling frequency, low error, low power consumption and low cost, and is suitable for application to the analog-to-digital conversion module of this scheme for analog-to-digital conversion.
In this embodiment, the control module adopts a design using a DSP chip as a main control component, the DSP chip is a unique microprocessor, has its own complete instruction system, is a device for processing a large amount of information by using digital signals, has a timing running speed up to tens of millions of complex instruction programs per second, is suitable for complex calculation, has a pin number greater than or equal to 144 processes, and has the advantages of good performance and easy development.
In the fault line, the zero sequence current lags the bus zero sequence voltage by 90 degrees, namely the phase difference between the zero sequence current and the bus zero sequence voltage is 90 degrees, but the fluctuation of the signal is considered. Therefore, in the present embodiment, the phase difference threshold range may be set to 90±5 degrees. Judging whether the phase difference between the voltage signals of the lines and the current signals of the lines is between 90+/-5 degrees for the lines corresponding to the selected m current signals with relatively large current amplitudes, and if so, determining that the lines have faults; if not, it is determined that the line has not failed.
In one embodiment, the output module includes: the display module is electrically connected with the control module;
the control module is used for displaying the circuit corresponding to the current signal in the preset phase difference threshold range to a user through the display module. Meanwhile, the control module can be used for displaying M interval zero sequence currents transmitted by the Hall sensor and bus zero sequence voltages transmitted by the plug-in type connector to a user through the display module.
In this embodiment, the sampled zero-sequence current and the bus zero-sequence voltage are displayed to the user through the display module, so that the user can know the acquisition situation in real time, and make a preliminary judgment on the situation of each line according to the acquired zero-sequence current and bus zero-sequence voltage. For example, when a certain zero sequence current is stable near 0, a user can directly judge that the line does not have a fault, so that logic verification can be further performed according to analysis of the control module.
In one embodiment, the apparatus further comprises: the alarm module is electrically connected with the control module;
The control module is used for controlling the alarm module to send out an alarm signal when judging that the phase difference of the line is in the phase difference threshold range so as to prompt a user to detect a fault line.
In this embodiment, when a line with a fault is detected by the alarm module, a user can be prompted timely, so that the user can record the line in time, namely, the fault is removed, thereby shortening the time for maintaining the fault in the fault line, improving the reliability of power supply of the power grid, and enabling the power consumer to have better experience.
Further, the apparatus may further include: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with the power grid control system;
the control module is used for transmitting the troubleshooting process and the relevant data of the troubleshooting result to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
In this embodiment, the wireless communication module can timely upload data generated during fault investigation and data of a fault investigation result to the power grid control system, so that the power grid control system can timely record the current investigation work and store corresponding data information, so that the power grid system can analyze according to the condition of each fault line, and further, the operation and optimization of the power grid system are better realized. For example, by analyzing that the a1 line fails multiple times in the multiple shared lines a in a certain area, when the multiple shared lines a fail again, the operation and maintenance personnel can detect and check the a1 line preferentially, so that the time for checking the failed line is further shortened.
It is easy to understand that the low-current grounding line selection device also comprises a power supply module for supplying power to the device, the power supply module can be an AC-DC switching power supply of the ABL2 model, and the switching power supply of the model has small voltage fluctuation and better voltage stability, thereby being more beneficial to the work and service life of components.
As shown in fig. 3, the present invention further provides a low-current grounding line selection system, including: the low-current grounding line selection device, the current terminal block, the voltage terminal block, the current transformer and the voltage transformer in any of the embodiments;
the current transformer converts primary large current of M lines into secondary small current through electromagnetic induction, and the secondary large current is introduced to corresponding terminal connection wires on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary low voltage to a terminal connecting wire on a voltage terminal strip;
The input ends of the Hall sensors of the small-current grounding line selection device are respectively connected with M terminal wiring lines on the current terminal row in sequence and are used for clamping secondary zero sequence current to be input into the device; the input end of the plug-in connector of the low-current grounding line selection device is connected to a terminal connecting wire of the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device.
In this embodiment, the collection of electric current and voltage is carried out through current transformer and voltage transformer to circuit one side to await measuring to introduce the electric current and the voltage of gathering on corresponding terminal row, so little electric current ground connection route selection device can connect through plug or the mode of pincers and get directly, and then can shorten the time of fault line investigation greatly, improves the efficiency of fault investigation.
As shown in fig. 4, the embodiment of the present invention further provides a fault line checking method, where the implementation main body is the small current grounding line selecting device in any one of the above embodiments, and the method includes the following steps:
Step 1: connecting the input ends of plug-in connectors of the low-current grounding line selection device to terminal wires of voltage terminal rows corresponding to the lines to be tested, which are formed by M lines, and connecting the input ends of N Hall sensors to the terminal wires of current terminal rows of the lines to be tested;
step 2: the small-current grounding line selection device acquires zero sequence currents of the M lines and corresponding bus zero sequence voltages by traversing terminal wiring on current terminal bars corresponding to the M lines;
Step 3: the low-current grounding line selection device determines a line with faults according to the collected zero sequence currents of M lines and the collected zero sequence voltages of buses.
In one embodiment, step3 specifically includes:
Sequencing the collected M zero sequence currents according to the sequence from the large current amplitude to the small current amplitude;
Determining a line corresponding to top m zero sequence currents with maximum current amplitudes positioned in front after sequencing as a suspicious line; wherein M is more than or equal to M;
respectively judging whether the phase difference between the zero sequence voltage of the bus and the zero sequence currents of the m suspicious lines is positioned between preset phase difference threshold ranges;
and determining the line with the phase difference between the preset phase difference threshold ranges in the suspicious lines as the failed line.
In one embodiment, the phase difference threshold range is [ 90.+ -. 5] degrees.
In one embodiment, the low-current grounding line selection device prompts a user through the display module and the alarm module after determining a line with a fault.
Compared with the prior art, the scheme has the following beneficial effects:
1) The scheme adopts a portable sampling mode, effectively shortens the investigation time of the 10kV system ground fault line, and has flexible movement, comprehensive technology and strong practicability.
2) The device provided by the scheme does not need to disconnect the voltage and current wiring in the use process, realizes the ground fault checking work on the premise that a voltage and current loop is not changed, and ensures the safety of equipment and a power grid. Meanwhile, the device is small in size, easy to carry and beneficial to quick installation and arrangement.
3) The successful development of the scheme solves the problem that the line cannot be selected quickly when the grounding short circuit fault occurs in the 10kV side line of the old transformer substation, shortens the fault influence time, improves the power supply reliability, and has higher use value.
4) The low-current grounding line selection device provided by the scheme is directly inserted into the terminal strip test terminal through the prefabricated plug-in type head to access the bus zero sequence voltage, is simple to operate, and has no high requirement on the skill level of the user of the device.
5) The small-current grounding line selection device provided by the scheme does not need a longer test cable when in actual field application, and is less restricted by actual field application conditions and environment.
The method embodiment provided by the invention is based on the same inventive concept as the embodiment of the device in the present specification, and the specific content can be referred to the description in the embodiment of the device in the present specification, which is not repeated here.
The modules or units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs. The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A low current ground line selection device, comprising: the device comprises N Hall sensors, a plug-in connector, an analog-to-digital conversion module, a control module and an output module;
The output ends of the N Hall sensors are connected to the analog-to-digital conversion module, and the output ends of the plug-in connectors are connected to the analog-to-digital conversion module; the analog-to-digital conversion module and the output module are electrically connected to the control module;
the input ends of the plug-in type connector are used for being connected to the terminal wires of the voltage terminal bars of the bus zero sequence voltage when the faults of the lines to be tested formed by M lines are checked, and the input ends of the N Hall sensors are used for being respectively connected to the terminal wires of the current terminal bars of the lines to be tested and are arranged in the following way When the connection wire of the terminal on the connected current terminal strip is replaced, the M lines are traversed; the Hall sensor is used for transmitting the interval zero-sequence currents of M analog quantities on the clamped current terminal strip to the analog-to-digital conversion module, the plug-in connector is used for transmitting the bus zero-sequence voltage on the voltage terminal strip to the analog-to-digital conversion module, the analog-to-digital conversion module converts the interval zero-sequence currents of the M analog quantities into current signals of M digital quantities, converts the bus zero-sequence voltage of the analog quantities into voltage signals of the digital quantities, and transmits the current signals of the M digital quantities and the voltage signals of the digital quantities to the control module; the control module is used for selecting top M current signals with the largest current amplitude from the M digital current signals, and judging whether the phase difference between the digital voltage signals and the top M current signals with the largest current amplitude is in a preset phase difference threshold range or not respectively; and determining a line corresponding to the current signal in the phase difference threshold range as a fault line, and outputting the fault line through the output module; wherein/>。
2. The low current ground line selection device of claim 1, wherein the output module comprises: the display module is electrically connected with the control module;
the control module is used for displaying the circuit corresponding to the current signal in the preset phase difference threshold range to a user through the display module.
3. The low-current grounding wire selection device according to claim 2, wherein the control module is further configured to display M interval zero sequence currents transmitted by the hall sensor and a bus zero sequence voltage transmitted by the plug-in connector to a user through the display module.
4. The low current ground line selection device of claim 2, further comprising: the alarm module is electrically connected with the control module;
And the control module is used for controlling the alarm module to send an alarm signal when judging that the phase difference of the line is in the phase difference threshold range so as to prompt a user to detect the fault line.
5. The low current ground line selection device of claim 1, further comprising: the communication module is electrically connected with the control module and is used for being connected to a switch of the fault investigation site through a communication line to realize communication with a power grid control system;
the control module is used for transmitting the troubleshooting process and the relevant data of the troubleshooting result to the power grid control system through the communication module so as to be recorded and stored by the power grid control system.
6. A low current ground line selection system, comprising: the low-current ground wire-selecting device, current terminal block, voltage terminal block, current transformer, and voltage transformer according to any one of claims 1 to 5;
The current transformer converts primary large current of M lines into secondary small current through electromagnetic induction, and the secondary large current is introduced to corresponding terminal connecting wires on the current terminal strip; the voltage transformer converts primary high voltage into secondary low voltage through electromagnetic induction and introduces the secondary high voltage into a terminal connecting wire on the voltage terminal strip;
The input ends of the Hall sensors of the small-current grounding line selection device are respectively connected with M terminal wiring lines on the current terminal block in sequence and are used for clamping secondary zero sequence current to be input into the device; the input end of the plug-in connector of the low-current grounding line selection device is connected to the terminal connection wire of the voltage terminal strip and is used for inputting the bus zero sequence voltage into the device, and the low-current grounding line selection device carries out analog-to-digital conversion on the input secondary zero sequence current and the bus zero sequence voltage and outputs a line with faults after logic judgment.
7. A fault line investigation method, characterized in that the implementation body is a low current grounding line selection device as in claims 1-5, the method comprising the steps of:
step 1: connecting the input ends of plug-in connectors of a low-current grounding line selection device to terminal wires of voltage terminal rows corresponding to lines to be tested, which are formed by M lines, and connecting the input ends of N Hall sensors to the terminal wires of current terminal rows of the lines to be tested;
step 2: the small-current grounding line selection device acquires zero sequence currents of the M lines and corresponding bus zero sequence voltages by traversing terminal wiring on current terminal bars corresponding to the M lines;
Step 3: the low-current grounding line selection device determines a line with faults according to the collected zero sequence currents of M lines and the collected zero sequence voltages of buses.
8. The fault line investigation method of claim 7, wherein the step 3 specifically comprises:
Sequencing the collected M zero sequence currents according to the sequence from the large current amplitude to the small current amplitude;
Determining lines corresponding to top m zero sequence currents with maximum current amplitudes positioned in front after sequencing as m suspicious lines; wherein, ；
Respectively judging whether the phase difference between the bus zero sequence voltage and the zero sequence currents of the m suspicious lines is positioned between preset phase difference threshold ranges;
and determining the line with the phase difference between the preset phase difference threshold ranges in the suspicious lines as the line with the fault.
9. The faulty line inspection method according to claim 8, wherein the phase difference threshold range is [90±5] degrees.
10. The fault line screening method according to claim 9, wherein the low current grounding line selection device prompts a user through the display module and the alarm module after determining the line with the fault.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401872A (en) * | 2011-12-09 | 2012-04-04 | 江苏镇安电力设备有限公司 | Earth fault line aligning and phasing method of IT electric system with neutral conductor |
| KR101277225B1 (en) * | 2012-05-25 | 2013-06-24 | 엘에스산전 주식회사 | Current detecting mechanism capable of detecting ground fault for direct current circuit breaker |
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
| CN204241604U (en) * | 2014-08-07 | 2015-04-01 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
| CN106646120A (en) * | 2016-11-25 | 2017-05-10 | 国网江苏省电力公司扬州供电公司 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
| CN107290629A (en) * | 2017-07-12 | 2017-10-24 | 国网青海省电力公司海南供电公司 | A kind of 10KV low-voltage networks Earth design method |
| KR102015329B1 (en) * | 2019-03-05 | 2019-08-28 | 주식회사 인터엠 | fault detection device by use of hall sensor and electronic load for speaker lines of emergency broadcasting |
| CN114034982A (en) * | 2021-11-16 | 2022-02-11 | 国网四川省电力公司检修公司 | Floating system direct current system ground fault point positioning method and system |
| CN116381382A (en) * | 2023-03-28 | 2023-07-04 | 国网福建省电力有限公司上杭县供电公司 | Novel 10kV switch room risk prompt device for transformer substation |
-
2023
- 2023-07-21 CN CN202310898518.0A patent/CN116973680B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401872A (en) * | 2011-12-09 | 2012-04-04 | 江苏镇安电力设备有限公司 | Earth fault line aligning and phasing method of IT electric system with neutral conductor |
| KR101277225B1 (en) * | 2012-05-25 | 2013-06-24 | 엘에스산전 주식회사 | Current detecting mechanism capable of detecting ground fault for direct current circuit breaker |
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
| CN204241604U (en) * | 2014-08-07 | 2015-04-01 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
| CN106646120A (en) * | 2016-11-25 | 2017-05-10 | 国网江苏省电力公司扬州供电公司 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
| CN107290629A (en) * | 2017-07-12 | 2017-10-24 | 国网青海省电力公司海南供电公司 | A kind of 10KV low-voltage networks Earth design method |
| KR102015329B1 (en) * | 2019-03-05 | 2019-08-28 | 주식회사 인터엠 | fault detection device by use of hall sensor and electronic load for speaker lines of emergency broadcasting |
| CN114034982A (en) * | 2021-11-16 | 2022-02-11 | 国网四川省电力公司检修公司 | Floating system direct current system ground fault point positioning method and system |
| CN116381382A (en) * | 2023-03-28 | 2023-07-04 | 国网福建省电力有限公司上杭县供电公司 | Novel 10kV switch room risk prompt device for transformer substation |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于双接地状态回路电阻测试装置的研制及应用分析;王贵山;广西电力;20230630;第46卷(第3期);71-75 * |
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