CN114487708A - High-low voltage distribution line fault measuring device and using method - Google Patents
High-low voltage distribution line fault measuring device and using method Download PDFInfo
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- CN114487708A CN114487708A CN202210086564.6A CN202210086564A CN114487708A CN 114487708 A CN114487708 A CN 114487708A CN 202210086564 A CN202210086564 A CN 202210086564A CN 114487708 A CN114487708 A CN 114487708A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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Abstract
A high-low voltage distribution line fault measuring device and a using method relate to the field of power line fault testing and comprise a signal controller, a fault point detector and a discharge channel controller. The device can be used for quickly measuring and positioning the fault point of the high-low voltage overhead distribution line and measuring the path and the fault point of the deeply buried cable, is convenient and quick, is accurate in positioning, effectively improves the troubleshooting efficiency, does not need to carry out high-hanging test or climbing test, and reduces the labor intensity of workers.
Description
Technical Field
The invention relates to the field of power line fault testing, in particular to a high-low voltage distribution line fault measuring device and a using method thereof.
Background
The high-low voltage distribution line is an important component of a power system, and after the high-low voltage distribution line fails, tripping and power failure occur, staff are relied on to inspect visually and climb the pole to check the failure, especially when hidden failure occurs, manual climbing pole base-by-base check can be only adopted, so that the efficiency is low, and the power failure time is too long; due to the hidden laying of the cable lines, the difficulty of fault finding is high, and particularly, due to long operation time, the measurement of paths and fault points is more difficult for power cables with the buried depth of more than 5 meters caused by repeated construction on the ground.
In the overhead line ground fault tracking and positioning device with the application number of CN201010508929.7, a device for searching the position of a fault point by using pulse current or pulse voltage is provided, although the fault point can be searched, when the device is in actual use and meets an overhead line, a high-hanging test or a direct climbing test is needed, and the device is not convenient.
Disclosure of Invention
In order to solve the problem that the high-low voltage distribution line fault point is inconvenient to find in the prior art, the invention provides the high-low voltage distribution line fault measuring device and the using method thereof, which can be used for not only quickly measuring and positioning the high-low voltage overhead distribution line fault point, but also measuring the path and the fault point of a deeply buried cable, are convenient and quick, are accurate in positioning, effectively improve the troubleshooting efficiency, do not need to carry out high-hanging test or climbing test, and reduce the labor intensity of workers.
The technical scheme of the invention is as follows:
the utility model provides a high-low voltage distribution lines fault measurement device, includes signal controller and fault point detector, signal controller includes signal generator, signal generator is connected with signal amplifier, signal amplifier is connected with the contactor, the contactor is connected with the signal converter, set up first voltmeter and first ampere meter between contactor and signal converter, the signal converter is connected with output port, fault point detector includes induction coil, the induction coil output is connected with one-level signal amplification circuit, one-level signal amplification circuit's output and frequency-selecting circuit are connected, frequency-selecting circuit's output and second grade amplification circuit are connected, second grade amplification circuit's output and third ampere meter are connected. The circuit is used for detecting a low-resistance grounding fault circuit, and can directly detect due to the fact that resistance is low and a high-voltage breakdown process is not needed.
Preferably, still include the discharge path controller, the discharge path controller includes the sine wave voltage regulator, the sine wave voltage regulator is connected with step up transformer's low-voltage end, step up transformer's high-pressure end is connected with the rectifier input, the output and the high-pressure port of rectifier are connected, the high-pressure port is connected with high-pressure isolation capacitor, high-pressure isolation capacitor is connected with input socket, input port uses with the output port cooperation. The circuit is used for detecting a high-resistance grounding fault circuit, needs high voltage to break down due to high resistance, and establishes a signal channel so that a signal of a signal generator can enter the fault circuit to be detected.
Preferably, the output port includes a first signal output socket and a second signal output socket, and the input port includes a first signal input socket and a second signal input socket. One end is required to be grounded and the other end is required to be connected to a faulty line.
Preferably, the high voltage port comprises a first high voltage output socket and a second high voltage output socket. One end is required to be grounded and the other end is required to be connected to a faulty line.
Preferably, the output voltage range of the output port is 0-1000V, and the output voltage range of the high-voltage port is 0-10 kV. The maximum output voltage of the signal controller is 0-1000V, and the maximum output voltage of the discharge channel controller is 0-10kV, so that the method is suitable for measuring the fault point of the low-voltage distribution line and the fault point of the 10kV high-voltage distribution line.
5. A use method of a high-low voltage distribution line fault measuring device comprises the following steps:
step 1: signal controller (1) regulation
Three-phase short circuit is carried out on the fault line after tripping and power loss, then the fault line is connected to a first signal output socket (14) of the signal controller (1), and a second signal output socket (15) is grounded;
electrifying the signal controller (1), operating the signal generator (17) and sending out a sine alternating current signal with specified frequency;
setting a signal amplifier connected with a signal generator (17) to be the minimum amplification factor, and confirming that the first voltmeter (12) displays zero voltage at the moment;
after the contactor is opened and the conversion ratio of the signal converter is set to be Q, a sinusoidal alternating current signal is injected into a three-phase short-circuit fault line through an output port;
step 2: faulty line detection
Adjusting the signal amplifier to increase the power of the sinusoidal AC signal so that the display value of the first ammeter (13) is increased; at the moment, the intensity value of the sinusoidal alternating current signal injected into the fault line by the signal controller (1) is Y, and Y is X/Q, wherein X is a preset value;
when the first ammeter (13) displays that the numerical value is X, the fault line fault point resistance value does not influence detection;
when the first ammeter (13) displays that the numerical value is smaller than X, the resistance value of the fault point of the fault line affects detection, a discharge channel controller (2) needs to be added between the signal controller (1) and the fault line, the discharge channel controller (2) breaks through the fault point through high voltage, a channel is established in the fault line, and the signal controller (1) is readjusted until the first ammeter (13) displays that the numerical value is X;
and step 3: fault point detection tracing
Adjusting the fault point detector (3) to the same frequency as the signal generator (17), opening the fault point detector (3) to track the sinusoidal alternating current signal along a fault line, and judging that the fault point is a fault point when the sinusoidal alternating current signal is lost;
preferably, in the step 2, the connection mode of the discharge channel control (2) is as follows:
connecting the first signal output socket (14) to the first signal input socket (28) and the second signal output socket (15) to the second signal input socket (27);
connecting the first high voltage output socket (24) to a fault line and the second high voltage output socket (25) to ground;
and (4) electrifying to start the sine wave voltage regulator, gradually increasing the voltage until a breakdown fault point, and establishing a sine alternating current signal injection channel.
Preferably, the signal generator (17) can set sinusoidal alternating current signals of various frequencies, and the fault point detector (3) can receive sinusoidal alternating current signals of various frequencies.
Preferably, the signal generator (17) selects the frequency of the sinusoidal alternating current signal to be inversely proportional to the length of the faulty line.
Preferably, the signal generator (17) selects the frequency of the sinusoidal alternating signal to be proportional to the depth of the fault line buried deep in the ground.
Preferably, the first ammeter (13) of step (1) indicates a value of X in the range of 0.6 to 1A.
Compared with the prior art, the invention has the advantages that:
1. a test signal with obvious characteristics is injected into a fault line (a high-voltage and low-voltage distribution line after tripping and losing power) through the signal controller, a reliable measurement basis is provided for line fault troubleshooting, different signal frequencies can be selected according to the length of the fault line through the test signal, the anti-interference performance is good, and the fault troubleshooting efficiency is improved.
2. The direct-current voltage is applied to the high-resistance fault point through the discharge channel controller, a signal injection channel is established, the stability is good, the effectiveness of signal injection is guaranteed, and the measurement problem of the hidden high-resistance ground fault is solved.
3. The fault point detector adjusts the receiving frequency through the frequency selection circuit, has good applicability for different fault lines, has wide coverage of fault measurement, makes the measurement easier and more accurate, and can measure not only the line fault of tripping operation and power failure, but also the line fault of live operation.
4. The path and the fault point of the deeply buried cable are measured by injecting signals, and test signals with different intensities and different frequencies can be injected according to the cables with different buried depths, so that the fault point measurement is easier and more accurate.
5. The device does not need to be used for ascending a height for testing and hanging up.
6. This device's signal controller can pour into sinusoidal alternating current signal into to the fault line, and use the fault point detector that has induction coil in this patent, can find this sinusoidal alternating current signal fast, under the wireless operation mode that need not connect the fault line, find the fault point fast, and when signal controller met the difficulty to fault line pouring into sinusoidal alternating current signal, can be supplementary through the discharge channel controller, reestablish the passageway so that use signal controller, the task can not independently be accomplished to any solitary part, but use three part simultaneously, can solve the problem of all high-low pressure distribution lines trouble.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a schematic diagram of a control panel structure of a signal controller according to the present invention;
FIG. 2 is a schematic diagram of the connection relationship of the signal controller circuit according to the present invention;
FIG. 3 is a schematic diagram of a control panel structure of the discharge channel controller according to the present invention;
FIG. 4 is a schematic diagram of the connection relationship of the discharge channel controller circuit according to the present invention;
FIG. 5 is a schematic diagram of a control panel structure of the fault point detector of the present invention;
FIG. 6 is a schematic diagram of the circuit connection relationship of the fault point detector of the present invention;
FIG. 7 is a schematic diagram of a low-impedance ground fault test of the present invention;
FIG. 8 is a schematic diagram of a high resistance ground fault test according to the present invention;
the components represented by the reference numerals in the figures are:
1. a signal controller; 11. a first power outlet; 12. a first voltmeter; 13. a first ammeter; 14. a first signal output socket; 15. a second signal output socket; 16. a start-stop button; 17. a signal generator; 2. a discharge channel controller; 21. a second power outlet; 22. a second voltmeter; 23. a second ammeter; 24. a first high voltage output socket; 25. a second high voltage output socket; 26. a voltage regulating knob of the sine wave voltage regulator; 27. a second signal input socket; 28. a first signal input socket; 3. a fault point detector; 31. a first frequency selective switch; 32. a second frequency selective switch; 33. a third frequency selective switch; 34. a power switch; 35. and a third ammeter.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.
Example 1
A high and low voltage distribution line fault measurement device comprising:
as shown in fig. 1-2, the signal controller 1 includes a signal generator 17 for generating a signal, and the signal generator 17 can send a sinusoidal ac signal with multiple frequencies, the signal generator 17 is connected with a signal amplifier, the signal amplifier is used for amplifying the sinusoidal ac signal of the signal controller 1, the signal amplifier is connected with a contactor, the contactor is provided with a start-stop button 16 for controlling start, the contactor is further connected with a signal converter, a first voltmeter 12 and a first ammeter 13 are arranged between the contactor and the signal converter, the signal converter is connected with an output port, and the signal converter can boost according to a conversion ratio Q. And this device is provided with first supply socket 11, conveniently carries out the circular telegram switch.
As shown in fig. 5-6, the fault point detector 3 comprises an induction coil, the sinusoidal AC signal used for inducing fault line, the output end of the induction coil is connected with a primary signal amplifying circuit which can amplify the sinusoidal AC signal received in the induction coil, the output end of the primary signal amplifying circuit is connected with a frequency selecting circuit which is provided with a plurality of frequency selecting switches, used for replacing the frequency of the sine alternating current signal, the output end of the frequency selection circuit is connected with a secondary amplifying circuit, the secondary amplifying circuit is used for amplifying the sine alternating current signal of the frequency selection circuit, and the output end of the second-stage amplifying circuit is connected with the third ammeter 35, so that the sinusoidal alternating current signal can be displayed on the third ammeter 35, and the third ammeter 35 is generally set as a milliammeter with a range of 100 mA. And the apparatus is provided with a power switch 34 for turning on or off the fault point detector 3.
As shown in fig. 3-4 discharge channel controller 2, discharge channel controller 2 includes the sine wave voltage regulator, the sine wave voltage regulator still is provided with sine wave voltage regulator pressure regulating knob 26 for regulating voltage, just the sine wave voltage regulator is connected with step up transformer's low-voltage end, can step up sine wave voltage regulator's voltage, later step up transformer's high-voltage end is connected with the rectifier input, and the rectifier can be direct current with alternating current conversion, and the output and the high-voltage port of rectifier are connected, the high-voltage port is connected with high voltage isolation capacitor, high voltage isolation capacitor is connected with input socket, input port and output port cooperation are used. The detection circuit is used for detecting a high-resistance grounding fault line, needs high voltage to break down when the resistance value of the fault line is high, and builds a sine alternating current signal channel so that a sine alternating current signal of a signal generator 17 can enter the fault line to be detected.
Further, the output ports include a first signal output socket 14 and a second signal output socket 15, and the input ports include a first signal input socket 28 and a second signal input socket 27. When the output port detects a low-resistance ground fault, one end of the output port is grounded, and the other end of the output port is connected with a fault line. When high-resistance ground fault detection is carried out, an input port needs to be connected in a matching mode. And can adopt the mode of quick plug wire to connect, it is very convenient.
The high voltage ports include a first high voltage output socket 24 and a second high voltage output socket 25. One end is required to be grounded and the other end is required to be connected to a faulty line. The connection mode is the same as the low-resistance grounding fault detection, and only a high-voltage breakdown process needs to be increased.
The output voltage range of the output port is 0-1000V, and the output voltage range of the high-voltage port is 0-10 kV. The highest 0-1000V of output voltage of the signal controller 1 and the highest 0-10kV of output voltage of the discharge channel controller 2 are suitable for measuring fault points of low-voltage distribution lines and 10kV high-voltage distribution lines.
A use method of a high-low voltage distribution line fault measuring device comprises the following steps:
step 1: signal controller 1 regulates
Three phases of a fault line are short-circuited after tripping and power loss, then the fault line is connected to a first signal output socket 14 of the signal controller 1, and then a second signal output socket 15 is grounded;
after the signal controller 1 is electrified, the signal generator 17 works, the signal generator 17 can generally send out a sinusoidal alternating current signal of 50 Hz-250 Hz, and the intensity of the sinusoidal current signal needs to be selected according to the length of a fault line;
setting a signal amplifier connected with the signal generator 17 (the signal amplifier can amplify the signal of the sinusoidal current signal generator 17 to 500W) as a minimum amplification factor, and confirming that the first voltmeter 12 displays zero voltage at the moment;
opening a contactor, setting a conversion ratio of a signal converter to be Q (the value of Q is generally 10 and is generally selected according to actual conditions), improving the voltage amplitude of a sinusoidal current signal, matching with a signal amplifier, controlling the current intensity of the sinusoidal current signal, and injecting the sinusoidal current signal into a three-phase short-circuited fault line through an output port;
step 2: faulty line detection
Adjusting the signal amplifier, and increasing the power of the sine alternating current signal to increase the display numerical value of the first ammeter 13;
at this time, the intensity value of the sinusoidal alternating-current signal injected into the fault line by the signal controller 1 is Y, and Y is X/Q, where X is a preset value; (X is preferably in the range of 0.6-1A because too small a current is not easily detected, and too large a current easily causes too much interference to affect the detection process), and when Q is used in the value of 10, the calculation is convenient, and Y is in the value range of 60-100 mA.
When the first ammeter 13 shows that the value is 1A (the best choice, at this time, the detection signal is easy to find, and the influence signal is less), the fault line fault point resistance value does not influence the detection; directly searching a fault point;
when the first ammeter 13 shows that the value is less than 0.6A (less than 0.6A is not easy to detect, and the problem needs to be solved by establishing a channel), the fault point resistance value of the fault line affects the detection, a discharge channel controller 2 needs to be added between the signal controller 1 and the fault line, the discharge channel controller 2 breaks down the fault point through high voltage, and establishes a channel on the fault line (the first signal output socket 14 is connected to the first signal input socket 28, the second signal output socket 15 is connected to the second signal input socket 27, the first high voltage output socket 24 is connected to the fault line, the second high voltage output socket 25 is grounded, the sine wave voltage regulator is electrically started, and the output voltage of the sine wave voltage regulator is generally a conventional voltage, namely, an alternating voltage between 0V and 220V (needs to be smoothly adjusted by the sine wave voltage regulating knob) to gradually increase the voltage, under the action of a step-up transformer, 0-10kV alternating voltage is obtained, the alternating voltage is converted into direct current through a rectifier, the direct current passes through a high-voltage port output value fault line, a fault point is punctured, a sine alternating current signal injection channel is established), the signal controller 1 is readjusted until the first ammeter 3 shows that the numerical value is 1A, the action of the discharge channel controller 2 is evaluated, and higher current can be achieved, so that the optimal value is generally selected to be 1A;
and step 3: fault point detection tracing
Adjusting the fault point detector 3 to the same frequency as the signal generator 17, opening the fault point detector 3 to track the sinusoidal alternating current signal along the fault line, and judging that the fault point is a fault point when the sinusoidal alternating current signal is lost;
in the process, the fault point detector 3 replaces different sinusoidal alternating current signal frequencies by selecting different frequency-selecting switches, so as to correspond to sinusoidal alternating current signals injected into a fault line channel by the signal controller 1.
Further, in practical applications, the first frequency-selective switch 31, the second frequency-selective switch 32 and the third frequency-selective switch 33 are generally arranged, and the frequencies of the sinusoidal alternating current signals are 120Hz, 220Hz and 250Hz respectively.
The greater the length of the fault line, the lower the frequency at which the signal generator 17 and the fault point detector 3 select signals. When the length of the fault line does not exceed 30KM, the second frequency-selecting switch 32 is normally used for opening, i.e. the frequency of the sinusoidal alternating current signal is 220HZ, and it is necessary to ensure that the frequency of the signal generator 17 is also adjusted to 220 HZ.
When the length of the fault line exceeds 30KM, the first frequency-selecting switch 31 is normally used for opening, that is, the frequency of the sinusoidal alternating current signal is 120HZ, and it needs to be ensured that the frequency of the signal generator 17 also needs to be adjusted to 120 HZ.
When detecting a deeply buried faulty line, the higher the depth, the higher the frequency at which the signal generator 17 and the fault point detector 3 select signals. The third frequency-selective switch 33 is typically selected so that the sinusoidal ac signal has a frequency of 250HZ, and it is necessary to ensure that the frequency of the signal generator 17 is also adjusted to 250 HZ.
When the device is used, because the fault point detector 3 needs to use an induction coil for detection, the numerical value Y of a sinusoidal alternating current signal injected into a fault line is set to be three intervals in advance, namely 0-50 mA, 50-100 mA and 100-150 mA, wherein when the detection is carried out, 0-50 mA is difficult to detect, the intensity of the sinusoidal alternating current signal is too low, the effect is poor when the line is erected or deeply buried, then 50-100 mA is tested, the intensity of the sinusoidal alternating current signal at the moment tends to be normal in the lifting process, the detection process can meet the requirement, the effect can be improved continuously until the line reaches 100-150 mA, the signal interference at the moment is too much, the influence on the detection process is large, and therefore the optimal range is selected from the sine alternating current signal, namely 50-100 mA.
And in the range, the detection is continued, particularly in the detection process of an overhead fault line, the effect is better when a sinusoidal alternating current signal reaches more than 60mA, so that the numerical value of Y is required to be set to 60-100 mA, correspondingly, because the numerical value of Y is determined by X and Q, the value of Y is required to be used as a reference, and in the process, the numerical value of Q is selected to be an integer, particularly an integer which is easy to calculate, the better effect is achieved, therefore, the numerical value of Q can be determined to be 10, and the corresponding value of X is convenient to determine, so that the experience shows that the value of X can be set to 0.6-1A in advance when the detection process is started, and the sinusoidal alternating current signal in the interval can be rapidly and accurately detected by the fault point detector 3 when injected into the fault line.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or additions or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The high-low voltage distribution line fault measuring device is characterized by comprising a signal controller (1) and a fault point detector (3), wherein the signal controller (1) comprises a signal generator (17), the signal generator (17) is connected with a signal amplifier which is connected with a contactor, the contactor is connected with a signal converter, a first voltmeter (12) and a first ammeter (13) are arranged between the contactor and the signal converter, the signal converter is connected with an output port, the fault point detector (3) comprises an induction coil, the output end of the induction coil is connected with a primary signal amplifying circuit, the output end of the primary signal amplifying circuit is connected with a frequency selecting circuit, the output end of the frequency selection circuit is connected with a secondary amplification circuit, and the output end of the secondary amplification circuit is connected with a third ammeter (35).
2. The high-low voltage distribution line fault measurement device according to claim 1, further comprising a discharge channel controller (2), wherein the discharge channel controller (2) comprises a sine wave voltage regulator, the sine wave voltage regulator is connected with a low-voltage end of the step-up transformer, a high-voltage end of the step-up transformer is connected with an input end of a rectifier, an output end of the rectifier is connected with a high-voltage port, the high-voltage port is connected with a high-voltage isolation capacitor, the high-voltage isolation capacitor is connected with an input port, and the input port and the output port are used in cooperation.
3. A high-low voltage distribution line fault measurement device according to claim 2, wherein the output ports include a first signal output receptacle (14) and a second signal output receptacle (15), and the input ports include a first signal input receptacle (28) and a second signal input receptacle (27).
4. The fault measurement device of claim 2, wherein the high voltage port comprises a first high voltage outlet (24) and a second high voltage outlet (25).
5. The use method of the high-low voltage distribution line fault measuring device is characterized by comprising the following steps:
step 1: signal controller (1) regulation
Three-phase short circuit is carried out on the fault line after tripping and power loss, then the fault line is connected to a first signal output socket (14) of the signal controller (1), and a second signal output socket (15) is grounded;
electrifying the signal controller (1), operating the signal generator (17) and sending out a sine alternating current signal with specified frequency;
setting a signal amplifier connected with a signal generator (17) to be the minimum amplification factor, and confirming that the first voltmeter (12) displays zero voltage at the moment;
after the contactor is opened and the conversion ratio of the signal converter is set to be Q, a sinusoidal alternating current signal is injected into a three-phase short-circuit fault line through an output port;
step 2: faulty line detection
Adjusting the signal amplifier to increase the power of the sinusoidal AC signal so that the display value of the first ammeter (13) is increased;
at the moment, the intensity value of the sinusoidal alternating current signal injected into the fault line by the signal controller (1) is Y, and Y is X/Q, wherein X is a preset value;
when the first ammeter (13) displays that the numerical value is X, the fault line fault point resistance value does not influence detection;
when the first ammeter (13) displays that the numerical value is smaller than X, the resistance value of the fault point of the fault line affects detection, a discharge channel controller (2) needs to be added between the signal controller (1) and the fault line, the discharge channel controller (2) breaks through the fault point through high voltage, a channel is established in the fault line, and the signal controller (1) is readjusted until the first ammeter (13) displays that the numerical value is X;
and step 3: fault point detection tracing
And adjusting the fault point detector (3) to the same frequency as the signal generator (17), opening the fault point detector (3) to track the sinusoidal alternating current signal along a fault line, and judging that the fault point is a fault point when the sinusoidal alternating current signal is lost.
6. The method for using the fault measuring device of the high-low voltage distribution line according to claim 5, wherein in the step 2, the connection mode of the discharge channel control (2) is as follows:
connecting the first signal output socket (14) to the first signal input socket (28) and the second signal output socket (15) to the second signal input socket (27);
connecting the first high voltage output socket (24) to a fault line and the second high voltage output socket (25) to ground;
and (4) electrifying to start the sine wave voltage regulator, gradually increasing the voltage until a breakdown fault point, and establishing a sine alternating current signal injection channel.
7. The use method of the fault measuring device for the high-low voltage distribution line according to claim 6, characterized in that the signal generator (17) can set sinusoidal alternating current signals with various frequencies, and the fault point detector (3) can receive sinusoidal alternating current signals with various frequencies.
8. Use of a device for measuring faults of high and low voltage distribution lines according to claim 7, characterized in that the signal generator (17) selects the frequency of the sinusoidal alternating current signal in inverse proportion to the length of the faulty line.
9. The method for using a fault measuring device of a high-low voltage distribution line according to claim 7, wherein the signal generator (17) selects the frequency of the sinusoidal alternating current signal to be proportional to the depth of the fault line buried deep in the ground.
10. The method for using the fault measuring device of the high-low voltage distribution line according to claim 6, wherein the first ammeter (13) in the step (1) indicates that the value X ranges from 0.6A to 1A.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116577712A (en) * | 2023-04-04 | 2023-08-11 | 国网江苏省电力有限公司南通供电分公司 | Fault detector for ring main unit electrified display device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116577712A (en) * | 2023-04-04 | 2023-08-11 | 国网江苏省电力有限公司南通供电分公司 | Fault detector for ring main unit electrified display device and control method thereof |
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