CN112578309A - Method and device for acquiring voltage reference signal of lightning arrester live test - Google Patents
Method and device for acquiring voltage reference signal of lightning arrester live test Download PDFInfo
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- 238000004804 winding Methods 0.000 description 14
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 238000001514 detection method Methods 0.000 description 9
- 230000010363 phase shift Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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Abstract
The application relates to a method and a device for acquiring a voltage reference signal for an arrester live test. The voltage reference signal acquisition method for the lightning arrester live test comprises the following steps: acquiring any power supply signal in a transformer substation; adjusting the power supply signal to obtain a first voltage signal with the same phase as a secondary voltage signal of the voltage transformer; the first voltage signal is used as a voltage reference signal. According to the voltage reference signal acquisition method for the live test of the lightning arrester, the power supply signal in the transformer substation is selected as the source of the voltage reference signal, the voltage signal does not need to be extracted from the secondary voltage of the voltage transformer and is used as the voltage reference signal, namely the secondary terminal does not need to be contacted, and therefore the power failure accident of primary equipment caused by mistakenly touching the wrong secondary terminal is avoided.
Description
Technical Field
The application relates to the technical field of lightning arrester detection, in particular to a method and a device for acquiring a voltage reference signal for lightning arrester live test of lightning arrester live detection and a method for lightning arrester live detection.
Background
The arrester is connected between the cable and ground, usually in parallel with the equipment to be protected. The lightning arrester can effectively protect the power equipment, and once abnormal voltage appears, the lightning arrester acts to play a role in protection. When the cable or equipment is operating at normal operating voltage, the arrester is not active and is considered to be an open circuit to ground. Once high voltage occurs and the insulation of the protected equipment is endangered, the lightning arrester acts immediately to guide high voltage impact current to the ground, thereby limiting the voltage amplitude and protecting the insulation of the cable and the equipment. When the overvoltage disappears, the lightning arrester is quickly restored to the original state, so that the power line works normally.
Therefore, the lightning arrester is one of important devices for ensuring the safe operation of the power system. The lightning arrester is usually inspected every year to find out possible defects of the lightning arrester in time. At present, in the live test of the lightning arrester, the used detection method needs to extract a secondary voltage signal of a voltage transformer as a voltage reference signal, but the method is easy to cause power failure accidents.
Disclosure of Invention
Therefore, it is necessary to provide a method for acquiring a voltage reference signal for an arrester live test, an apparatus for acquiring the voltage reference signal, and a method for detecting an arrester live, aiming at the problem that the existing arrester live detection method has a large power outage risk.
In a first aspect, a method for acquiring a voltage reference signal for an arrester live test is provided, including:
acquiring any power supply signal in a transformer substation;
adjusting the power supply signal to obtain a first voltage signal with the same phase as a secondary voltage signal of the voltage transformer;
the first voltage signal is used as a voltage reference signal.
In one embodiment, the step of adjusting the power signal to obtain a first voltage signal having the same phase as the secondary voltage signal of the voltage transformer comprises:
performing voltage reduction processing on the power supply signal to obtain a second voltage signal;
converting the second voltage signal into a digital signal;
adjusting the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer;
converting the digital signal after phase adjustment into an analog signal as a third voltage signal;
and boosting the third voltage signal to obtain the first voltage signal.
In one embodiment, the voltage amplitude of the second voltage signal is 5V.
In one embodiment, the voltage reference signal has a voltage amplitude of 60V.
In one embodiment, the voltage amplitude of the power signal is 220V.
In one embodiment, the frequencies of the power signal, the first voltage signal, the second voltage signal and the third voltage signal are the same.
In a second aspect, there is provided an apparatus for acquiring a voltage reference signal for live test of an arrester, including:
the power supply signal acquisition module is used for acquiring any power supply signal in the transformer substation;
and the voltage signal phase shifting module is used for adjusting the power signal to obtain a first voltage signal with the same phase as the secondary voltage signal of the voltage transformer as a voltage reference signal.
In one embodiment, the voltage signal phase shift module comprises:
the voltage reduction unit is used for carrying out voltage reduction processing on the power supply signal to obtain a second voltage signal;
the analog-to-digital conversion unit is used for converting the second voltage signal into a digital signal;
the control unit is used for adjusting the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer;
and the digital-to-analog conversion unit is used for converting the digital signal after the phase adjustment into an analog signal as a third voltage signal.
And the boosting unit is used for boosting the third voltage signal to obtain the first voltage signal.
In one embodiment, the device for acquiring the voltage reference signal for the lightning arrester live test further comprises a touch screen for inputting the phase difference to be offset by the control unit.
In a third aspect, a computer device is provided, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to realize the method for acquiring the voltage reference signal of the lightning arrester live test according to any one of the first aspect.
In a fourth aspect, there is provided a computer-readable storage medium, on which a computer program is stored, which, when being executed by the processor, implements the method for acquiring the voltage reference signal for the lightning arrester live test according to any one of the first aspect.
In a fifth aspect, a lightning arrester live test method is provided, including:
according to the method for acquiring the voltage reference signal of the lightning arrester live test, the voltage reference signal of the lightning arrester is acquired;
obtaining leakage current of the lightning arrester;
and judging the performance of the lightning arrester according to the phase difference between the voltage reference signal of the lightning arrester and the leakage current of the lightning arrester.
In a sixth aspect, an apparatus for testing the lightning arrester is provided, which includes:
the voltage acquisition module is used for acquiring a voltage reference signal of the arrester according to the method for acquiring the voltage reference signal of the lightning arrester live test in any one of the first aspects;
the current acquisition module is used for acquiring leakage current of the lightning arrester;
and the judging module is used for judging the performance of the lightning arrester according to the phase difference between the voltage reference signal of the lightning arrester and the leakage current of the lightning arrester.
In a seventh aspect, there is provided an arrester live test instrument, which includes a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to implement the arrester live test method according to any one of the above fifth aspects.
In an eighth aspect, there is provided a computer-readable storage medium, on which a computer program is stored, which, when being executed by an actuator, implements the lightning arrester live test method according to any one of the fifth aspects.
According to the method and the device for acquiring the voltage reference signal for the live test of the lightning arrester and the live detection method of the lightning arrester, the power supply signal in the transformer substation is selected as the source of the voltage reference signal, the voltage signal does not need to be extracted from the secondary voltage of the voltage transformer to serve as the voltage reference signal, namely, the secondary terminal does not need to be contacted, and therefore the power failure accident of primary equipment caused by mistakenly touching the wrong secondary terminal can be avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the wiring for the live tester test of the arrester in one embodiment;
FIG. 2 is a table showing the correspondence between the phase difference between the secondary voltage and the leakage current and the performance of the surge arrester in one embodiment;
fig. 3 is a schematic flow chart illustrating a method for acquiring a voltage reference signal for a live test of an arrester according to an embodiment;
FIG. 4 is a flow chart illustrating a method for adjusting a power signal according to an embodiment;
fig. 5 is a block diagram showing a configuration of a voltage reference signal acquisition device for the live test of the arrester according to an embodiment;
FIG. 6 is a block diagram of a voltage signal phase shift module according to an embodiment;
FIG. 7 is a schematic flow chart of a method for testing the lightning arrester during live-line operation according to an embodiment;
fig. 8 is a block diagram showing the structure of the lightning arrester live test apparatus according to an embodiment.
Description of reference numerals: 102-timer, 104-lightning arrester live tester, 106-current terminal, 108-voltage transformer, 110-voltage terminal, 500-lightning arrester voltage reference signal acquisition device, 502-power signal acquisition module, 504-voltage signal phase-shifting module, 602-voltage reduction unit, 604-analog-digital conversion unit, 606-control unit, 608-digital-analog conversion unit, 610-voltage boosting unit, 800-lightning arrester live test device, 802-voltage acquisition module, 504-current acquisition module and 806-judgment module
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
The metal arrester is a commonly used arrester, but the metal arrester can be affected by the surrounding environment and be affected by damp when the metal arrester runs for a long time, so that the fundamental component of resistive current can be obviously increased, and the insulating property of the zinc oxide arrester can be greatly weakened. In addition, when the valve sheet is aged, the higher harmonic component of the resistive current is also significantly increased, which also results in the insulation of the metal arrester.
Therefore, as described in the background art, the lightning arrester is generally tested every year to determine the condition of the lightning arrester, so as to reduce the number of power failures. Conventionally, a live-line test of an arrester is generally performed using an arrester live-line tester, and referring to fig. 1, which is a wiring diagram of the live-line tester test of the arrester, a current is taken out by a timer 102 and inputted to a current terminal 106 of a live-line tester 104 as a current reference signal, and a secondary voltage of a voltage transformer 108 is taken out and inputted to a voltage terminal 110 of the live-line tester 104 as a voltage reference signal. The basic detection principle of the lightning arrester live-line tester 104 is to judge the performance of the lightning arrester according to the phase difference between the secondary voltage signal of the voltage transformer and the leakage current of the lightning arrester, and refer to fig. 2, which is an exemplary corresponding relationship between the phase difference between the secondary voltage signal and the leakage current and the performance of the lightning arrester. Wherein the resistive current can be obtained by a harmonic method, a compensation method or a projection method.
Referring to fig. 1, currently, in a lightning arrester live test, a detection method used in the lightning arrester live test needs to extract a secondary voltage signal of a voltage transformer as a voltage reference signal, specifically, the secondary voltage is extracted through a secondary terminal, but in practical application, a plurality of secondary terminals are provided in the same environment, and a control loop is connected to some of the secondary terminals, so that once the secondary terminals are connected, equipment protection malfunction can be caused, and a power failure accident can be caused.
In view of this, the embodiment of the present application provides a method for acquiring a voltage reference signal for a live test of an arrester, in which a power signal in a substation is selected as a source of the voltage reference signal, and it is not necessary to extract the voltage signal from a secondary voltage of a voltage transformer as the voltage reference signal, that is, it is not necessary to contact a secondary terminal, so that a power failure accident of primary equipment due to mistaken touch of the wrong secondary terminal is avoided.
In one embodiment, as shown in fig. 3, there is provided a method for acquiring a voltage reference signal for live test of an arrester, including:
and S302, acquiring any power supply signal in the transformer substation.
Specifically, the transformer substation can acquire a plurality of places of power signals, so that the places of the power signals can be flexibly selected, and power signals such as power sockets and emergency lamps can be selected.
In an alternative embodiment of the present application, the power signal is a voltage signal of a power socket, and the voltage amplitude is 220V.
S304, adjusting the power supply signal to obtain a first voltage signal with the same phase as the secondary voltage signal of the voltage transformer.
And S306, taking the first voltage signal as a voltage reference signal.
It should be explained that, as can be seen from the above analysis, because the lightning arrester live-line tester judges the performance of the lightning arrester based on the phase difference between the secondary voltage signal of the voltage transformer and the leakage current, the phase of the voltage reference signal input to the lightning arrester should be the same as the phase of the secondary voltage signal of the voltage transformer, so as to ensure that the corresponding relationship between the phase difference result and the performance of the lightning arrester is accurate.
Because this application embodiment adjusts the phase place of power signal into the voltage signal the same with voltage transformer secondary voltage signal phase place, consequently this application embodiment can utilize current arrester live tester to detect the performance of arrester, and need not to prepare new arrester tester again, and is convenient and save the cost.
According to the method for acquiring the voltage reference signal for the live test of the lightning arrester, the power signal in the transformer substation is selected as the source of the voltage reference signal, the voltage signal does not need to be extracted from the secondary voltage of the voltage transformer and is used as the voltage reference signal, namely, the secondary terminal does not need to be contacted, and therefore the power failure accident of primary equipment cannot be caused due to mistaken touch of the wrong secondary terminal.
As described above, to obtain the voltage reference signal, the power signal needs to be adjusted to obtain the first voltage signal having the same phase as the secondary voltage signal of the voltage transformer, and referring to fig. 4, the following embodiment provides a method for adjusting the power signal to obtain the first voltage signal having the same phase as the secondary voltage signal of the voltage transformer.
S402, performing voltage reduction processing on the power supply signal to obtain a second voltage signal.
Optionally, the power signal may be subjected to voltage reduction processing by a step-down transformer. Optionally, the step-down transformer is a single-phase double-winding transformer, and the main components of the step-down transformer are an iron core and two windings sleeved on the iron core. A power supply signal is input to the primary winding, and the secondary winding outputs a second voltage signal. It should be noted that the number of turns of the first winding is greater than that of the second winding, and the magnitude of the second voltage signal can be adjusted by the number of turns of the first winding and the second winding. In an alternative embodiment of the present application, the voltage amplitude of the power signal is 220V, and the second voltage signal is output through the step-down transformer, and the voltage amplitude of the second voltage signal is 5V.
And S404, converting the second voltage signal into a digital signal.
Specifically, there are generally three processes for converting an analog signal into a digital signal, which are respectively: sampling, quantizing, and encoding. Specifically, sampling is to extract samples of the analog signal at equal intervals, so that the continuous signal becomes a discrete signal. Quantization is the transformation of the sampled sample into the closest digital value, representing the size of the sample. The coding means that the quantized value is represented by a set of binary numbers. In an alternative embodiment of the present application, the second voltage signal is input to an analog-to-digital converter (a/D converter) to be converted into a digital signal. In an alternative embodiment of the present application, the voltage amplitude of the second voltage signal input to the analog-to-digital converter is 5V.
And S406, adjusting the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer.
Optionally, the phase of the digital signal is adjusted according to the phase difference between the power signal and the secondary voltage signal of the voltage transformer, so as to obtain the digital signal with the same phase as the secondary voltage signal of the voltage transformer. In an alternative embodiment of the present application, the voltage amplitude of the phase-adjusted digital signal is 5V.
And S408, converting the digital signal after phase adjustment into an analog signal as a third voltage signal.
Specifically, converting the digital signal into the analog signal corresponds to the inverse process of S404. The basic principle of D/a conversion, which converts a digital signal into an analog signal, is to multiply a value to be converted by a step voltage to obtain an output voltage. It should be noted that the step voltage is determined by the range of the analog output voltage and the number of bits of the digital signal, for example, when 10-bit a/D conversion is performed, the range of the analog output voltage is 0 to 8V, the input number is decimal 512, and the output voltage is 4V. In an alternative embodiment of the present application, the phase-adjusted digital signal is input to a D/a converter to obtain a third voltage signal, and the voltage amplitude of the third voltage signal is 5V.
And S410, boosting the third voltage signal to obtain a first voltage signal.
Optionally, the power signal may be subjected to voltage reduction processing by a step-up transformer. Optionally, the step-up transformer is a single-phase double-winding transformer, and the main components of the step-down transformer are an iron core and two windings sleeved on the iron core. The third voltage signal is input to the primary winding, and the secondary winding outputs the first voltage signal. It should be noted that the number of coils of the secondary winding is larger than that of the primary winding. In an alternative embodiment of the present application, the third voltage signal has a voltage amplitude of 5V, and the first voltage signal has a voltage amplitude of 60V.
As can be seen from the above analysis, the frequencies of the signals, that is, the frequencies of the power supply signal, the first voltage signal, the second voltage signal, and the third voltage signal are the same, without being changed by the step-down processing, the a/D conversion processing, the phase shift processing, the D/a conversion processing, and the step-up processing.
In an optional embodiment of the application, a sinusoidal voltage signal with an amplitude of 220V and a frequency of 50Hz in a transformer substation is transmitted to a step-down transformer, and a sinusoidal voltage signal with an amplitude of 5V and a frequency of 50Hz is output; inputting the voltage signal after voltage reduction treatment into an A/D converter to obtain a digital voltage signal; processing the digital voltage signal according to the phase difference between the power signal and the secondary voltage signal of the voltage transformer to obtain a voltage signal with the same phase as the secondary voltage signal of the voltage transformer; inputting the voltage signal after phase shift processing into a D/A converter to obtain an analog signal with the voltage amplitude of 5V and the frequency of 50 Hz; and finally, inputting the analog signal into a step-up transformer to obtain a voltage signal with the amplitude of 60V and the frequency of 50Hz, and taking the voltage signal as a voltage reference signal.
According to the above embodiment, the voltage amplitude of the power signal is 220V and the frequency is 50Hz, the voltage amplitude of the second voltage signal is 5V and the frequency is 50Hz, the voltage amplitude of the first voltage signal is 60V and the frequency is 50Hz, and the voltage amplitude of the third voltage signal is 5V and the frequency is 50 Hz. Namely, the frequencies of the power signal, the first voltage signal, the second voltage signal and the third voltage signal are all the same and are 50 Hz.
As described in the above embodiment, the phase of the digital signal is adjusted according to the phase difference between the power signal and the secondary voltage signal of the voltage transformer, so as to obtain a digital signal having the same phase as the secondary voltage signal of the voltage transformer. The following embodiments will provide a method of obtaining a phase difference between a power supply signal and a secondary signal of a voltage transformer.
Optionally, the phase difference between the power signal and the secondary signal of the voltage transformer is measured by a zero-crossing detection method, the zero-crossing time of the power signal and the secondary signal of the voltage transformer is measured, the time difference Δ t between the two is calculated, and the corresponding phase difference is as follows:
△Φ＝(△t/T)*360
where T is the period of the power supply signal.
Although the above-mentioned embodiment needs to obtain the secondary voltage of the voltage transformer to obtain the phase difference, since the phase difference between the power signal and the secondary voltage of the voltage transformer is fixed, the secondary voltage of the voltage transformer does not need to be extracted each time when the lightning arrester is subjected to the live test, and after the phase difference is obtained, the phase difference can be directly used when the next live test is performed.
It should be noted that when the power supply signal is changed, the phase difference should be acquired again. Optionally, the phase difference between the new power signal and the original power signal and the phase difference between the original power signal and the secondary voltage of the voltage transformer are obtained through calculation, and then the new power signal is adjusted according to the new phase difference. This embodiment need not to draw voltage transformer secondary voltage once more, has reduced the risk that primary equipment has cut off power.
It should be understood that although the various steps in the flowcharts of fig. 3-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 3-4 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 5, there is provided an apparatus 500 for acquiring a voltage reference signal for live testing of an arrester, including: a power signal acquisition module 502 and a voltage signal phase shift module 504, wherein:
the power signal obtaining module 502 is configured to obtain any power signal in the substation.
The voltage signal phase shift module 504 is configured to adjust the power signal to obtain a first voltage signal having the same phase as a secondary voltage signal of the voltage transformer, and use the first voltage signal as a voltage reference signal.
In an alternative embodiment of the present application, referring to fig. 6, the voltage signal phase shift module 504 includes: a buck unit 602, an analog-to-digital conversion unit 604, a control unit 606, a digital-to-analog conversion unit 608, and a boost unit 610, wherein:
the voltage reduction unit 602 is configured to perform voltage reduction processing on the power signal to obtain a second voltage signal.
The analog-to-digital conversion unit 604 is configured to convert the second voltage signal into a digital signal.
The control unit 606 is configured to adjust the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer.
The digital-to-analog conversion unit 608 is configured to convert the phase-adjusted digital signal into an analog signal as a third voltage signal.
The voltage boosting unit 610 is configured to boost the third voltage signal to obtain a first voltage signal.
In an optional embodiment of the present application, the apparatus for acquiring a voltage reference signal for live test of an arrester further includes a touch screen for inputting a phase difference to be shifted by the control unit. Optionally, the device for acquiring the lightning arrester voltage reference signal further includes a key for inputting a phase difference to be shifted by the control unit.
For the specific definition of the device for acquiring the voltage reference signal for the lightning arrester live test, reference may be made to the above definition of the method for acquiring the voltage reference signal for the lightning arrester live test, and details are not described here. All or part of the modules in the device for acquiring the voltage reference signal for the live test of the lightning arrester can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In an embodiment, there is further provided a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps in the above-mentioned method for acquiring reference voltage signals for live test of lightning arresters when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, realizes the steps in the above-mentioned method embodiment for acquiring a reference voltage for a live test of an arrester.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The embodiment provides a method for acquiring a voltage reference signal for an arrester live test, and the voltage reference signal is acquired to detect the performance of the arrester so as to judge the state of the arrester and reduce the power failure times. The following embodiments will provide a lightning arrester live test method.
Referring to fig. 7, a method for testing an arrester in a live state according to an embodiment of the present application is shown. The lightning arrester live test method can comprise the following steps:
s702, acquiring the voltage reference signal of the arrester according to the voltage reference signal acquisition method for the lightning arrester live test.
Specifically, the voltage reference signal of the arrester is acquired with reference to the method for acquiring the voltage reference signal of the lightning arrester live test of S302-S306.
And S704, obtaining the leakage current of the lightning arrester.
S706, judging the performance of the lightning arrester according to the phase difference between the voltage reference signal of the lightning arrester and the leakage current of the lightning arrester.
In an optional embodiment of the present application, the lightning arrester is a zinc oxide lightning arrester, and a zinc oxide lightning arrester live tester is used for live test. Firstly, the lightning arrester live tester is grounded, then a current test wire is connected to the lower end of the zinc oxide lightning arrester and the upper end of the counter, and finally the voltage reference signal of the lightning arrester obtained in the step S702 is connected to the lightning arrester live tester through the voltage test wire. The performance of the zinc oxide arrester is judged by the current-voltage phase difference Φ, and in particular, reference is made to fig. 2 for a corresponding relationship between the phase difference Φ and the performance of the zinc oxide arrester.
It should be understood that, although the steps in the flowchart of fig. 7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 7 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 8, there is provided an arrester live test apparatus 800, including: a voltage acquisition module 802, a current acquisition module 804, and a determination module 806, wherein:
the voltage obtaining module 802 is configured to obtain the voltage reference signal of the arrester according to the above method for obtaining the voltage reference signal of the live test of the arrester.
The current obtaining module 804 is configured to obtain a leakage current of the lightning arrester.
The judging module 806 is configured to judge the performance of the arrester according to a phase difference between a voltage reference signal of the arrester and a leakage current of the arrester.
For the specific definition of the lightning arrester live test device, reference may be made to the above definition of the lightning arrester live test method, which is not described herein again. The modules in the lightning arrester live testing device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In an embodiment, there is further provided a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps in the above-mentioned lightning arrester live test method embodiments when executing the computer program.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the above-mentioned respective arrester live test method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for acquiring a voltage reference signal of an arrester live test is characterized by comprising the following steps:
acquiring any power supply signal in a transformer substation;
adjusting the power supply signal to obtain a first voltage signal with the same phase as a secondary voltage signal of the voltage transformer;
and taking the first voltage signal as a voltage reference signal.
2. The method for acquiring the voltage reference signal of the live test of the lightning arrester according to claim 1, wherein the step of adjusting the power signal to obtain the first voltage signal having the same phase as the secondary voltage signal of the voltage transformer comprises:
performing voltage reduction processing on the power supply signal to obtain a second voltage signal;
converting the second voltage signal into a digital signal;
adjusting the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer;
converting the digital signal after phase adjustment into an analog signal as a third voltage signal;
and boosting the third voltage signal to obtain the first voltage signal.
3. The method for acquiring the voltage reference signal for the live test of the arrester according to claim 2, wherein the voltage amplitude of the second voltage signal is 5V.
4. The method for acquiring the voltage reference signal for the live test of the arrester according to claim 1, wherein the voltage amplitude of the voltage reference signal is 60V.
5. The method for acquiring the voltage reference signal in the live test of the lightning arrester according to claim 1, wherein the voltage amplitude of the power supply signal is 220V.
6. The method for acquiring the voltage reference signal in the live test of the lightning arrester according to claim 2, wherein the frequencies of the power signal, the first voltage signal, the second voltage signal and the third voltage signal are the same.
7. The utility model provides an acquisition device of voltage reference signal of arrester live test which characterized in that includes:
the power supply signal acquisition module is used for acquiring any power supply signal in the transformer substation;
and the voltage signal phase shifting module is used for adjusting the power supply signal to obtain a first voltage signal with the same phase as the secondary voltage signal of the voltage transformer as a voltage reference signal.
8. The apparatus for acquiring voltage reference signal of lightning arrester live test according to claim 7, wherein the voltage signal phase-shifting module comprises:
the voltage reduction unit is used for carrying out voltage reduction processing on the power supply signal to obtain a second voltage signal;
the analog-to-digital conversion unit is used for converting the second voltage signal into a digital signal;
the control unit is used for adjusting the phase of the digital signal to be the same as the secondary voltage signal of the voltage transformer;
the digital-to-analog conversion unit is used for converting the digital signal after the phase adjustment into an analog signal as a third voltage signal;
and the boosting unit is used for boosting the third voltage signal to obtain the first voltage signal.
9. The apparatus for acquiring a voltage reference signal for live testing of an arrester according to claim 8, further comprising a touch screen for inputting a phase difference to be offset by the control unit.
10. An arrester live-line test method is characterized by comprising the following steps:
the method for acquiring the voltage reference signal of the live test of the lightning arrester according to any one of claims 1 to 6, wherein the voltage reference signal of the lightning arrester is acquired;
acquiring leakage current of the lightning arrester;
and judging the performance of the lightning arrester according to the phase difference between the voltage reference signal of the lightning arrester and the leakage current of the lightning arrester.
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Application publication date: 20210330 |