CN117949781A - Low-voltage line fault finding device and method - Google Patents
Low-voltage line fault finding device and method Download PDFInfo
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- CN117949781A CN117949781A CN202410354178.XA CN202410354178A CN117949781A CN 117949781 A CN117949781 A CN 117949781A CN 202410354178 A CN202410354178 A CN 202410354178A CN 117949781 A CN117949781 A CN 117949781A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a low-voltage line fault finding device and method, which mainly relate to the technical field of line fault finding and are used for solving the problems of inaccurate finding and positioning of fault points of faults, long finding time, inaccurate researching and judging of reasons of the faults, untimely maintenance, frequent power failure of clients, long power failure time, poor power supply reliability and the like in the prior art. Comprising the following steps: the system comprises a micro-control computer, a residual current type finder, a high-frequency signal type finder and a high-voltage discharge type finder, wherein the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder are connected with the micro-control computer; the residual current type finder comprises a current transformer and a first wireless signal passback; the high-frequency signal type finder comprises a high-frequency signal generator and a high-frequency signal receiver, wherein the high-frequency signal transmitter comprises a high-frequency signal regulator, a high-frequency signal transmitter and a second digital display, and the high-frequency signal receiver comprises a second wireless signal feedback device, a digital signal regulator and a signal amplifying loudspeaker; the high-voltage discharge type finder comprises a 0-15KV high-voltage generator and a snoop detector.
Description
Technical Field
The application relates to the technical field of line fault finding, in particular to a low-voltage line fault finding device and method.
Background
The low-voltage line fault finding device is a device for locating a fault of a low-voltage power line. The method is mainly used in the urban low-voltage distribution network, and helps electric power staff to quickly and accurately find out fault points so as to repair and restore power supply in time.
Existing low-voltage line fault finding devices are generally composed of the following parts: fault indicator: a fault indicator mounted on the low voltage line can monitor changes in current and voltage and signal when a fault occurs; a data acquisition unit: the data acquisition unit is responsible for collecting signals sent by the fault indicator and transmitting the signals to the central control system; and a central control system: the central control system receives and processes data from the data acquisition unit and presents fault information to an operator via a display screen or other means. The operator can quickly determine the position of the fault point according to the information and take corresponding repair measures.
However, under the condition of broken lines, short circuits and electric leakage grounding of the lines in the underground, cable and wall under the prior art, the positions of fault points are difficult to intuitively find out in the process of line inspection, the existing equipment is inaccurate in finding and positioning the fault points of the faults, long in finding time, and incapable of finding trend of hidden lines in a charged manner, so that the problems of inaccurate judgment on reasons of the faults, untimely maintenance, frequent power failure of customers, long power failure time, poor power supply reliability and the like are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a low-voltage line fault searching device and method, which are used for solving the problems that the position of a fault point is difficult to intuitively find out in the line inspection process in the prior art, the fault point of the fault is not accurately searched and positioned by the prior equipment, the searching time is long, the cause of the fault is not accurately researched and judged, the maintenance is not timely, the frequent power failure of a customer, the power failure time is long, the power supply reliability is poor and the like.
In a first aspect, the present application provides a low voltage line fault finding apparatus, the apparatus comprising: the system comprises a micro-control computer, a residual current type finder, a high-frequency signal type finder and a high-voltage discharge type finder, wherein the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder are connected with the micro-control computer; the residual current type finder comprises a current transformer and a first wireless signal feedback device, and the current transformer comprises a flexible plug type mutual inductance coil and a first digital display; the high-frequency signal type finder comprises a high-frequency signal generator and a high-frequency signal receiver, the high-frequency signal transmitter comprises a high-frequency signal regulator, a high-frequency signal transmitter and a second digital display, the high-frequency signal receiver comprises a second wireless signal feedback device, a digital signal regulator and a signal loudspeaker, and the high-frequency signal regulator is respectively connected with the high-frequency signal transmitter and the second digital display; the high-voltage discharge type finder comprises a 0-15KV high-voltage generator and a snoop device, and the 0-15KV high-voltage generator comprises: an ac transformer, a short-circuit ground discharge device, a high voltage output regulator, a snoop comprising: the radio amplifier, the third wireless signal passback ware, cavity radio reception probe rod and the sound public address loudspeaker that discharges, wherein, alternating current transformer links to each other with high voltage output regulator, and radio reception amplifier links to each other with cavity radio reception probe rod and sound public address loudspeaker that discharges respectively.
Further, the micro-control computer consists of a micro-CPU computer, a display and a data wireless receiving device.
Further, the apparatus further comprises: the power management component is connected with the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder respectively; the power management component consists of a power monitor and a power manager; controlling and monitoring an input power supply by a power supply monitor; and distributing power for the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder through a power manager.
Further, the current transformer in the residual current type finder comprises a test range acquisition component; the test range acquisition component comprises a data acquisition interface, a test range calculation program and a test display interface.
Further, the micro-control computer is also connected with external computer equipment through a 485 data port.
In a second aspect, the present application provides a low-voltage line fault finding method, applied to a low-voltage line fault finding device, the method comprising: after the micro-control computer turns on a power supply and completes data self-checking, a power supply switch is turned on through a power supply management component, and when the input power supply is monitored to meet the requirement, electric energy is distributed to a residual current type finder, a high-frequency signal type finder and a high-voltage discharge type finder; after the residual current type finder is electrified, determining a testing range corresponding to the current transformer; determining whether a leakage fault point exists in a line to be detected or not through a current transformer; the residual current data is returned to the micro-control computer through the first wireless signal return device; after the high-frequency signal type finder is electrified, the trend, the buried depth, the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected are obtained through the high-frequency signal generator and the high-frequency signal receiver; returning the first test data to the micro-control computer through the second wireless signal return device; after the high-voltage discharging type finder is electrified, obtaining a broken line point, a short circuit point and a leakage fault point corresponding to a line to be detected through a 0-15KV high-voltage generator and a snoop device; returning the second test data to the micro-control computer through the third wireless signal return device; based on the residual current data, the first test data and the second test data, the micro-control computer determines the fault type corresponding to the line to be detected and displays the fault type on the digital display screen.
Further, when the power switch is turned on through the power management component and the input power supply is monitored to meet the requirement, the electric energy is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder, and the method specifically comprises the following steps of: the power switch is controlled to be turned on by a power monitor in the power management component; after the power quality of the input power supply is monitored to meet the preset requirement through the power supply monitor, the power is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder through the power supply manager in the power supply management component.
Further, determining, by the current transformer, whether a line to be detected has a leakage fault point, specifically includes: inserting current transformer plugs into the wire harness to be tested through flexible plug type mutual inductance coils on each preset measuring point corresponding to the wire harness to be tested to form a closed loop so as to obtain residual current data corresponding to the loop at each preset measuring point of the wire harness to be tested through measurement, and displaying the residual current data on a first digital display; when residual current data corresponding to any two adjacent preset measurement points are 0 and non-0, determining boundary points of line sections corresponding to the two adjacent preset measurement points as leakage fault points.
Further, the method for acquiring the trend, the buried depth, the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected through the high-frequency signal generator and the high-frequency signal receiver specifically comprises the following steps: after the two wire clamps are clamped on a line to be tested, determining a specific range of a high-frequency signal output by the high-frequency signal transmitter through a high-frequency signal regulator in the high-frequency signal generator; based on the specific range of the high-frequency signal, determining a receiving range of a high-frequency signal receiver by the digital signal regulator, and then receiving the signal through the high-frequency signal receiver; determining the trend of the line to be tested through the pointer direction displayed by the high-frequency signal receiver, and determining the burial depth of the line to be tested through the second digital display; starting a signal amplifying loudspeaker, and adjusting a search range corresponding to a high-frequency signal receiver into a preset search range through a digital signal regulator, so as to obtain signal values corresponding to each preset signal detection section on a to-be-tested line; when the signal values corresponding to any two adjacent preset signal detection sections are 0 and non-0, determining the demarcation points corresponding to the two adjacent preset signal detection sections as disconnection points; when the difference value between the signal values corresponding to any two adjacent preset signal detection sections is larger than a preset difference value threshold value, determining that the demarcation points corresponding to the two adjacent preset signal detection sections are short circuit points or leakage fault points; further, when it is determined that there is a signal along the direction of the line wire to be tested and the signal is returned along the direction of the ground perpendicular to the line, it is determined as a leakage fault point, otherwise it is a short circuit point.
Further, obtaining a disconnection point, a short circuit point and a leakage fault point corresponding to a line to be detected through a 0-15KV high-voltage generator and a snoop device, wherein the method specifically comprises the following steps of: cutting off all loads on a line to be detected, and after two wire clamps are respectively clamped on the line to be detected, determining a specific range of outputting high voltage by an alternating current transformer in a 0-15KV high voltage generator through a high voltage output regulator in the 0-15KV high voltage generator; turning on a sounding device, using a hollow sound receiving sounding rod, rotating a sound receiving loudspeaker button to receive signals, and turning on a discharge sound amplifying loudspeaker switch; and determining that the point, which is found by the snoop device and is greater than a preset sound threshold value, of the discharge sound loudspeaker on the to-be-detected line is a broken line point, a short circuit point or a leakage fault point.
As will be appreciated by those skilled in the art, the present application has at least the following beneficial effects:
1. The trend of the buried low-voltage lines, cables, in-wall lines and the like can be searched under the power failure and electrified states. 2. The method can be suitable for fault positioning test of low-voltage lines, equipment, optical cables and cables, can quickly find and position broken lines, short circuits and leakage points of the lines, and can cover all line scenes by using high-frequency signal transmission and receiving technology and high-voltage line discharging technology. 3. The test device is applicable to a wide range of test objects, can test various optical cables, cables and hidden wires with metal conductors (wire pairs, protective layers and shielding layers), and can monitor trip values of the leakage protector and leakage values of electrical equipment. 4. The system can detect in various modes, can carry out technical complementation, has accurate fault point positioning, can effectively solve the problems of frequent power failure, long power failure time, poor power supply reliability and the like of clients, reduces the times of power failure and the power failure time, improves the power supply reliability and reduces the power failure loss of the clients.
Drawings
Some embodiments of the present disclosure are described below with reference to the accompanying drawings, in which:
Fig. 1 is a schematic diagram of an internal structure of a low-voltage line fault finding device according to an embodiment of the present application.
Fig. 2 is a flowchart of a low-voltage line fault finding method provided in an embodiment of the present application.
Reference numerals:
1. A micro-control computer; 11. a micro CPU computer; 12. a display; 13. a data wireless receiving device; 2. a residual current type finder; 21. a current transformer; 211. a flexible plug type mutual inductance coil; 212. a first digital display; 22. a first wireless signal backhaul device; 3. a high frequency signal type finder; 31. a high frequency signal generator; 311. a high frequency signal conditioner; 312. a high frequency signal transmitter; 313. a second digital display; 32. a high frequency signal receiver; 321. a second wireless signal passback; 322. a digital signal regulator; 323. a signal amplifying horn; 4. a high voltage discharge type finder; 41. 0-15KV high-voltage generator; 411. an alternating current transformer; 412. a high voltage output regulator; 413. a short circuit ground discharge device; 42. a snoop machine; 421. a radio loudspeaker; 422. a third wireless signal passback; 423. a hollow radio probe rod; 424. discharging sound amplifying horn; 5. a power management component; 51. a power supply monitor; 52. a power manager.
Detailed Description
It should be understood by those skilled in the art that the embodiments described below are only preferred embodiments of the present disclosure, and do not represent that the present disclosure can be realized only by the preferred embodiments, which are merely for explaining the technical principles of the present disclosure, not for limiting the scope of the present disclosure. Based on the preferred embodiments provided by the present disclosure, all other embodiments that may be obtained by one of ordinary skill in the art without inventive effort shall still fall within the scope of the present disclosure.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The following describes the technical scheme provided by the embodiment of the application in detail through the attached drawings.
Fig. 1 is a diagram of a low-voltage line fault finding device according to an embodiment of the present application. As shown in fig. 1, the system provided by the embodiment of the present application mainly includes: a micro-control computer 1, a residual current type finder 2, a high-frequency signal type finder 3 and a high-voltage discharge type finder 4 which are connected with the micro-control computer 1.
The micro-control computer 1 may be any feasible device or apparatus capable of acquiring data and performing data processing.
As an example, the micro-control computer 1 may be composed of a micro-CPU computer 11, a display 12, and a data wireless receiving device 13.
In addition, the micro-control computer 1 can also acquire an external processing program or processing data to further process the data uploaded by the searcher. The specific implementation process can be as follows: and the device is connected with external computer equipment through a 485 data port.
In addition, in order to realize the allocation and monitoring of the effective control power resources, the application further comprises: and the power management component 5 is respectively connected with the residual current type finder 2, the high-frequency signal type finder 3 and the high-voltage discharge type finder 4. Any possible device or apparatus capable of monitoring the input power and distributing the electrical energy among the residual current type finder 2, the high-frequency signal type finder 3 and the high-voltage discharge type finder 4 is possible.
As an example, the power management component 5 may be composed of a power monitor 51 and a power manager 52; controlling and monitoring the input power by the power monitor 51; the residual current type finder 2, the high-frequency signal type finder 3 and the high-voltage discharge type finder 4 are allocated with power by the power manager 52.
The residual current type finder 2 may be any feasible device or apparatus capable of obtaining the residual power of the line and further determining whether a fault point exists.
As an example, the residual current type finder 2 may include a current transformer 21 and a first wireless signal passback 22, wherein the current transformer 21 includes a flexible plug type transformer coil 211 and a first digital display 212; the residual current can be tested by the flexible plug type transformer 211 and displayed by a display. In addition, in order to effectively select a suitable test range of the current transformer 21, the current transformer 21 in the residual current type finder 2 includes a test range acquisition component; the test range acquisition component comprises a data acquisition interface, a test range calculation program and a test display interface. The test range evaluation data can be obtained through the data acquisition interface, and then the test range is calculated through the existing test range calculation program, and then the test range is displayed on the test display interface.
The high-frequency signal type finder 3 may be any feasible device or apparatus capable of sending out a high-frequency signal, and further obtaining the trend, the buried depth, the disconnection point, the short circuit point, and the like of the line to be detected, and uploading the test data to the micro-control computer 1 by using the high-frequency signal.
As an example, the high frequency signal finder 3 may include a high frequency signal generator 31 and a high frequency signal receiver 32, and the high frequency signal transmitter includes a high frequency signal adjuster 311, a high frequency signal transmitter 312, and a second digital display 313, and the high frequency signal receiver 32 includes a second wireless signal passback 321, a digital signal adjuster 322, and a signal amplifying horn 323, wherein the high frequency signal adjuster 311 is connected to the high frequency signal transmitter 312 and the second digital display 313, respectively.
The high-voltage discharging type finder 4 may be any available equipment or device capable of obtaining a disconnection point, a short circuit point, and a leakage fault point corresponding to a line to be detected by using high voltage, and uploading test data to the micro-control computer 1.
As an example, the high voltage discharge finder 4 may include a 0-15KV high voltage generator 41 and a snoop detector 42, and the 0-15KV high voltage generator 41 includes: ac transformer 411, short-circuit ground discharge 413, high voltage output regulator 412, and snoop 42 includes: the radio sound amplifier 421, the third wireless signal feedback device 422, the hollow radio sound probe 423 and the discharge sound speaker 424, wherein the alternating current transformer 411 is connected with the high voltage output regulator 412, and the radio sound amplifier 421 is respectively connected with the hollow radio sound probe 423 and the discharge sound speaker 424.
Based on the above description, it can be understood by those skilled in the art that the present application provides a line fault searching device, which is composed of five major parts, namely, a micro-control computer 1, a power management component 5, a residual current type searching device 2, a high-frequency signal type searching device 3 and a high-voltage discharging type searching device 4. After the micro-control computer 1 is powered on and the data self-checking is completed, the power switch is controlled to be turned on through the power monitor 51 in the power management component 5; after the power quality of the input power supply meets the preset requirement through the power supply monitor 51, the power is distributed to the residual current type finder 2, the high-frequency signal type finder 3 and the high-voltage discharge type finder 4 through the power supply manager 52 in the power supply management component 5. (1) residual current type finder 2 operation flow: inserting a current transformer 21 plug after penetrating the wire harness to be tested through the flexible plug type mutual inductor 211 to form a closed loop so as to obtain residual current data corresponding to the loop at each preset point to be tested of the wire harness to be tested through measurement, and displaying the residual current data on the first digital display 212; when residual current data corresponding to any two adjacent preset measurement points are 0 and non-0, determining boundary points of line sections corresponding to the two adjacent preset measurement points as leakage fault points. (2) high frequency signal type finder 3 operation flow: after the two wire clamps are clamped on the line to be tested, determining the specific range of the high-frequency signal output by the high-frequency signal transmitter 312 through the high-frequency signal regulator 311 in the high-frequency signal generator 31; based on the specific range of the high-frequency signal, the digital signal regulator 322 is determined to regulate the receiving range of the high-frequency signal receiver 32, and thus the signal is received by the high-frequency signal receiver 32; determining the trend of the line to be tested through the pointer direction displayed by the high-frequency signal receiver 32, and determining the burial depth of the line to be tested through the second digital display 313; starting a signal amplifying horn 323, and adjusting the searching range corresponding to the high-frequency signal receiver 32 into a preset searching range through the digital signal regulator 322 so as to obtain signal values corresponding to each preset signal detection section on the line to be tested; when the signal values corresponding to any two adjacent preset signal detection sections are 0 and non-0, determining the demarcation points corresponding to the two adjacent preset signal detection sections as disconnection points; when the difference value between the signal values corresponding to any two adjacent preset signal detection sections is larger than a preset difference value threshold value, determining that the demarcation points corresponding to the two adjacent preset signal detection sections are short circuit points or leakage fault points; further, when it is determined that there is a signal along the direction of the line wire to be tested and the signal is returned along the direction of the ground perpendicular to the line, it is determined as a leakage fault point, otherwise it is a short circuit point. (3) high-voltage discharge type finder 4 operation flow: after all loads on a line to be detected are cut off and disconnected, and two wire clamps are respectively clamped on the line to be detected, a specific range of outputting high voltage by an alternating current transformer 411 in the 0-15KV high voltage generator 41 is determined through a high voltage output regulator 412 in the 0-15KV high voltage generator 41; the sounding device 42 is turned on, a hollow sound receiving sounding rod 423 is used, a sound receiving loudspeaker 421 button is rotated to receive signals, and a discharging sound amplifying loudspeaker 424 switch is turned on; the point where the sound of the discharge sound loudspeaker 424 on the line to be detected found by the snoop machine 42 is greater than the preset sound threshold is determined as a disconnection point, a short circuit point or a leakage fault point.
In addition, the operation flow of the micro-control computer 1 comprises: residual current data, first test data and second test data are acquired through a data wireless receiving device 13 in the micro-control computer 1, and then the fault type corresponding to the line to be detected is analyzed and determined through a micro-CPU 11 in the micro-control computer 1 and displayed on a display 12.
In addition, the embodiment of the application also provides a low-voltage line fault searching method, as shown in fig. 2, which mainly comprises the following steps:
and 210, turning on a power supply of the micro-control computer, turning on a power switch through a power management component after the data self-checking is completed, and distributing electric energy to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder when the input power supply is monitored to meet the requirements.
When the input power supply is monitored to meet the requirement, the electric energy is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder, and the method specifically can comprise the following steps of:
The power switch is controlled to be turned on by a power monitor in the power management component; after the power quality of the input power supply is monitored to meet the preset requirement through the power supply monitor, the power is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder through the power supply manager in the power supply management component.
It should be noted that the preset requirement may be any feasible requirement.
Step 220, after the residual current type finder is electrified, determining a testing range corresponding to the current transformer; determining whether a leakage fault point exists in a line to be detected or not through a current transformer; the residual current data is returned to the micro-control computer through the first wireless signal return device.
Wherein, whether the line to be detected has an electric leakage fault point or not is determined by the current transformer, which can specifically comprise:
Inserting current transformer plugs into the wire harness to be tested through flexible plug type mutual inductance coils on each preset measuring point corresponding to the wire harness to be tested to form a closed loop so as to obtain residual current data corresponding to the loop at each preset measuring point of the wire harness to be tested through measurement, and displaying the residual current data on a first digital display; when residual current data corresponding to any two adjacent preset measurement points are 0 and non-0, determining boundary points of line sections corresponding to the two adjacent preset measurement points as leakage fault points.
Step 230, after the high-frequency signal type finder is powered on, acquiring trend, burial depth, disconnection point, short circuit point and leakage fault point corresponding to the line to be detected through the high-frequency signal generator and the high-frequency signal receiver; the first test data is returned to the micro-control computer through the second wireless signal return device.
The method for obtaining the trend, the buried depth, the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected through the high-frequency signal generator and the high-frequency signal receiver specifically comprises the following steps:
After the two wire clamps are clamped on a line to be tested, determining a specific range of a high-frequency signal output by the high-frequency signal transmitter through a high-frequency signal regulator in the high-frequency signal generator; based on the specific range of the high-frequency signal, determining a receiving range of a high-frequency signal receiver by the digital signal regulator, and then receiving the signal through the high-frequency signal receiver; determining the trend of the line to be tested through the pointer direction displayed by the high-frequency signal receiver, and determining the burial depth of the line to be tested through the second digital display; starting a signal amplifying loudspeaker, and adjusting a search range corresponding to a high-frequency signal receiver into a preset search range through a digital signal regulator, so as to obtain signal values corresponding to each preset signal detection section on a to-be-tested line; when the signal values corresponding to any two adjacent preset signal detection sections are 0 and non-0, determining the demarcation points corresponding to the two adjacent preset signal detection sections as disconnection points; when the difference value between the signal values corresponding to any two adjacent preset signal detection sections is larger than a preset difference value threshold value, determining that the demarcation points corresponding to the two adjacent preset signal detection sections are short circuit points or leakage fault points; further, when it is determined that there is a signal along the direction of the line wire to be tested and the signal is returned along the direction of the ground perpendicular to the line, it is determined as a leakage fault point, otherwise it is a short circuit point.
Step 240, based on the residual current data, the first test data and the second test data, the micro-control computer determines the fault type corresponding to the line to be detected and displays the fault type on the digital display screen.
The method for acquiring the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected through the 0-15KV high-voltage generator and the snooper comprises the following steps:
Cutting off all loads on a line to be detected, and after two wire clamps are respectively clamped on the line to be detected, determining a specific range of outputting high voltage by an alternating current transformer in a 0-15KV high voltage generator through a high voltage output regulator in the 0-15KV high voltage generator; turning on a sounding device, using a hollow sound receiving sounding rod, rotating a sound receiving loudspeaker button to receive signals, and turning on a discharge sound amplifying loudspeaker switch; and determining that the point, which is found by the snoop device and is greater than a preset sound threshold value, of the discharge sound loudspeaker on the to-be-detected line is a broken line point, a short circuit point or a leakage fault point.
Thus far, the technical solution of the present disclosure has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the protective scope of the present disclosure is not limited to only these specific embodiments. The technical solutions in the above embodiments may be split and combined by those skilled in the art without departing from the technical principles of the present disclosure, and equivalent modifications or substitutions may be made to related technical features, which all fall within the scope of the present disclosure.
Claims (10)
1. A low voltage line fault finding apparatus, the apparatus comprising:
the system comprises a micro-control computer, a residual current type finder, a high-frequency signal type finder and a high-voltage discharge type finder, wherein the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder are connected with the micro-control computer;
The residual current type finder comprises a current transformer and a first wireless signal feedback device, and the current transformer comprises a flexible plug type mutual inductance coil and a first digital display;
The high-frequency signal type finder comprises a high-frequency signal generator and a high-frequency signal receiver, the high-frequency signal transmitter comprises a high-frequency signal regulator, a high-frequency signal transmitter and a second digital display, the high-frequency signal receiver comprises a second wireless signal feedback device, a digital signal regulator and a signal loudspeaker, and the high-frequency signal regulator is respectively connected with the high-frequency signal transmitter and the second digital display;
The high-voltage discharge type finder comprises a 0-15KV high-voltage generator and a snoop device, and the 0-15KV high-voltage generator comprises: an ac transformer, a short-circuit ground discharge device, a high voltage output regulator, a snoop comprising: the radio amplifier, the third wireless signal passback ware, cavity radio reception probe rod and the sound public address loudspeaker that discharges, wherein, alternating current transformer links to each other with high voltage output regulator, and radio reception amplifier links to each other with cavity radio reception probe rod and sound public address loudspeaker that discharges respectively.
2. The low-voltage line fault finding apparatus as claimed in claim 1, wherein,
The micro-control computer consists of a micro-CPU computer, a display and a data wireless receiving device.
3. The low voltage line fault finding device of claim 1, further comprising: the power management component is connected with the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder respectively;
The power management component consists of a power monitor and a power manager; controlling and monitoring an input power supply by a power supply monitor; and distributing power for the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder through a power manager.
4. The low voltage line fault finding device as claimed in claim 1, wherein the current transformer in the residual current type finder comprises a test range acquisition component;
The test range acquisition component comprises a data acquisition interface, a test range calculation program and a test display interface.
5. The low voltage line fault finding device as claimed in claim 1, wherein the micro control computer is further connected to an external computer device through a 485 data port.
6. A low-voltage line fault finding method applied to the low-voltage line fault finding device as claimed in claim 1, characterized in that the method comprises:
after the micro-control computer turns on a power supply and completes data self-checking, a power supply switch is turned on through a power supply management component, and when the input power supply is monitored to meet the requirement, electric energy is distributed to a residual current type finder, a high-frequency signal type finder and a high-voltage discharge type finder;
After the residual current type finder is electrified, determining a testing range corresponding to the current transformer; determining whether a leakage fault point exists in a line to be detected or not through a current transformer; the residual current data is returned to the micro-control computer through the first wireless signal return device;
after the high-frequency signal type finder is electrified, the trend, the buried depth, the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected are obtained through the high-frequency signal generator and the high-frequency signal receiver; returning the first test data to the micro-control computer through the second wireless signal return device;
After the high-voltage discharging type finder is electrified, obtaining a broken line point, a short circuit point and a leakage fault point corresponding to a line to be detected through a 0-15KV high-voltage generator and a snoop device; returning the second test data to the micro-control computer through the third wireless signal return device;
Residual current data, first test data and second test data are acquired through a data wireless receiving device in the micro-control computer, and then the fault type corresponding to the line to be detected is determined through analysis of a micro-CPU computer in the micro-control computer and displayed on a display.
7. The method of claim 6, wherein the power switch is turned on by the power management component, and when the input power is monitored to meet the requirement, the power is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder, and the method specifically comprises the following steps:
The power switch is controlled to be turned on by a power monitor in the power management component;
After the power quality of the input power supply is monitored to meet the preset requirement through the power supply monitor, the power is distributed to the residual current type finder, the high-frequency signal type finder and the high-voltage discharge type finder through the power supply manager in the power supply management component.
8. The method for finding a fault in a low-voltage line according to claim 6, wherein determining whether a fault point of leakage exists in the line to be detected through a current transformer comprises:
inserting current transformer plugs into the wire harness to be tested through flexible plug type mutual inductance coils on each preset measuring point corresponding to the wire harness to be tested to form a closed loop so as to obtain residual current data corresponding to the loop at each preset measuring point of the wire harness to be tested through measurement, and displaying the residual current data on a first digital display;
When residual current data corresponding to any two adjacent preset measurement points are 0 and non-0, determining boundary points of line sections corresponding to the two adjacent preset measurement points as leakage fault points.
9. The method for searching the low-voltage line fault according to claim 6, wherein the trend, the buried depth, the disconnection point, the short circuit point and the leakage fault point corresponding to the line to be detected are obtained through the high-frequency signal generator and the high-frequency signal receiver, and the method specifically comprises the following steps:
after the two wire clamps are clamped on a line to be tested, determining a specific range of a high-frequency signal output by the high-frequency signal transmitter through a high-frequency signal regulator in the high-frequency signal generator;
based on the specific range of the high-frequency signal, determining a receiving range of a high-frequency signal receiver by the digital signal regulator, and then receiving the signal through the high-frequency signal receiver;
determining the trend of the line to be tested through the pointer direction displayed by the high-frequency signal receiver, and determining the burial depth of the line to be tested through the second digital display;
Starting a signal amplifying loudspeaker, and adjusting a search range corresponding to a high-frequency signal receiver into a preset search range through a digital signal regulator, so as to obtain signal values corresponding to each preset signal detection section on a to-be-tested line; when the signal values corresponding to any two adjacent preset signal detection sections are 0 and non-0, determining the demarcation points corresponding to the two adjacent preset signal detection sections as disconnection points;
When the difference value between the signal values corresponding to any two adjacent preset signal detection sections is larger than a preset difference value threshold value, determining that the demarcation points corresponding to the two adjacent preset signal detection sections are short circuit points or leakage fault points; further, when it is determined that there is a signal along the direction of the line wire to be tested and the signal is returned along the direction of the ground perpendicular to the line, it is determined as a leakage fault point, otherwise it is a short circuit point.
10. The method for searching the low-voltage line fault according to claim 6, wherein the method for searching the low-voltage line fault is characterized by obtaining a disconnection point, a short circuit point and a leakage fault point corresponding to a line to be detected through a 0-15KV high-voltage generator and a snooper, and specifically comprises the following steps:
Cutting off all loads on a line to be detected, and after two wire clamps are respectively clamped on the line to be detected, determining a specific range of outputting high voltage by an alternating current transformer in a 0-15KV high voltage generator through a high voltage output regulator in the 0-15KV high voltage generator; turning on a sounding device, using a hollow sound receiving sounding rod, rotating a sound receiving loudspeaker button to receive signals, and turning on a discharge sound amplifying loudspeaker switch;
and determining that the point, which is found by the snoop device and is greater than a preset sound threshold value, of the discharge sound loudspeaker on the to-be-detected line is a broken line point, a short circuit point or a leakage fault point.
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| CN202410354178.XA CN117949781B (en) | 2024-03-27 | Low-voltage line fault finding device and method |
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| CN202410354178.XA CN117949781B (en) | 2024-03-27 | Low-voltage line fault finding device and method |
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