CN112731081A - Method and device for acquiring partial discharge phase - Google Patents
Method and device for acquiring partial discharge phase Download PDFInfo
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- CN112731081A CN112731081A CN202011559701.0A CN202011559701A CN112731081A CN 112731081 A CN112731081 A CN 112731081A CN 202011559701 A CN202011559701 A CN 202011559701A CN 112731081 A CN112731081 A CN 112731081A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012423 maintenance Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 208000028659 discharge Diseases 0.000 description 15
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- Testing Relating To Insulation (AREA)
Abstract
The invention provides a method and a device for acquiring partial discharge phase, which can convert non-monotonous sine waves in a single period into monotonous sawtooth waves in the single period, acquire the waveform of the sawtooth waves in a very short time, and determine the phase of the sine waves corresponding to the section of the waveform.
Description
Technical Field
The present invention relates to the field of power technologies, and in particular, to a method and an apparatus for acquiring a partial discharge phase.
Background
At present, an instrument for acquiring the original waveform of a partial discharge ultrahigh frequency signal cannot acquire the power frequency phase of the ultrahigh frequency signal, because the single acquisition time length is within about 500ns when the ultrahigh frequency signal is acquired, if the power frequency voltage and current signals are acquired synchronously, the acquisition time is too short compared with the power frequency period, and the corresponding power frequency phase cannot be confirmed.
Disclosure of Invention
To solve the above problems, the present invention provides a method and apparatus for acquiring a partial discharge phase.
The method comprises the following steps:
a) acquiring 220V alternating current from a maintenance power supply, and reducing the voltage into low-voltage alternating current;
b) acquiring the frequency f of low-voltage alternating current, defining a phase difference alpha as a phase position where the voltage of a maintenance power supply lags behind the voltage of equipment to be subjected to partial discharge detection, defining a phase difference beta as a phase position where the voltage of the low-voltage alternating current lags behind the voltage of the maintenance power supply, and calculating to obtain alpha and beta;
c) inputting the low-voltage alternating current into a voltage comparator, and converting a power frequency sinusoidal signal into a square wave signal by the voltage comparator;
d) inputting the square wave signal into a processor, and outputting a voltage signal which is increased from 0V according to a fixed slope k after the processor detects a rising edge every time so as to convert the voltage signal into a sawtooth wave signal;
e) inputting the sawtooth wave signal into ultrahigh frequency signal sampling equipment, simultaneously acquiring the ultrahigh frequency signal and the sawtooth wave signal by the sampling equipment, and calculating the time t when partial discharge occurs according to the amplitude of the sawtooth wave signal;
f) and b, converting the time t of the partial discharge into a phase gamma according to the frequency f obtained in the step b:
γ＝360tf；
g) according to the phase difference alpha obtained in the step b, converting the phase gamma into a real phase delta:
δ＝γ+α+β。
preferably, the step c of converting the power frequency sinusoidal signal into the square wave signal includes:
the threshold value of the voltage comparator is 0V, when the voltage of the low-voltage alternating current is positive, the voltage comparator outputs a fixed positive voltage signal, and when the voltage of the low-voltage alternating current is negative, the voltage comparator outputs 0V.
Preferably, the method for calculating the time t when the partial discharge occurs in step e includes:
wherein, wmIs the amplitude of the sawtooth wave signal when the ultrahigh frequency signal has a maximum value.
Preferably, the method for calculating the time t when the partial discharge occurs in step e includes:
wherein,
is the average value of the amplitudes of the sawtooth signals.
The device comprises:
and the voltage reduction module is used for reducing the 220V alternating voltage of the maintenance power supply into a low-voltage alternating signal.
And the voltage comparator is used for converting the sine wave into the square wave.
And the processor is used for calculating data and converting the square wave into the sawtooth wave.
And the power supply module is used for rectifying the alternating current into direct current to supply power to the whole set of device.
The invention has the beneficial effects that:
the invention converts the non-monotonous sine wave in the single period into the monotonous sawtooth wave in the single period, and collects the waveform of the sawtooth wave in a very short time, thus determining the phase of the sine wave corresponding to the waveform of the section.
The invention realizes the acquisition of the original waveform of the ultrahigh frequency signal of the partial discharge and the determination of the power frequency phase of the partial discharge, the ultrahigh frequency original waveform signal is used for the positioning of the partial discharge, and the power frequency phase is used for drawing partial discharge diagnosis maps such as PRPD maps and the like.
Detailed Description
The technical solution proposed by the present invention will be further explained according to specific examples, which are as follows
Step S1: 220V alternating current is obtained from a maintenance power supply and is reduced to low-voltage alternating current by using a small transformer.
Step S2: and acquiring a phase difference alpha of the voltage of the maintenance power supply lagging behind the voltage of equipment (such as a GIS (geographic information system) and a transformer) to be subjected to partial discharge detection through a background system of the transformer substation, acquiring a phase difference beta of the voltage of the low-voltage alternating current lagging behind the voltage of the maintenance power supply in S1 through measurement, and acquiring the frequency f of the low-voltage alternating current through measurement.
Step S3: the low-voltage alternating current is input into a voltage comparator, the threshold value of the voltage comparator is 0V, when the voltage of the low-voltage alternating current is positive, the voltage comparator outputs a fixed positive voltage signal, when the voltage of the low-voltage alternating current is negative, the voltage comparator outputs 0V, and the voltage comparator converts a power frequency sinusoidal signal into a square wave signal.
Step S4: the square wave signal is input into a processor, the processor continuously detects rising edges, after the rising edges are detected each time, voltage signals which are increased from 0V according to a fixed slope k are output, and the square wave signal is converted into a sawtooth wave signal by the processor.
Step S5: the sawtooth wave signal is input to an ultrahigh frequency signal sampling device, the sampling device simultaneously collects the ultrahigh frequency signal and the sawtooth wave signal, the sawtooth wave signal is w, and two methods are provided for calculating the time t when partial discharge occurs:
or
Is the average value of the amplitudes of the sawtooth signals.
Step S6: the time t is converted into a phase γ of 360tf from the frequency f obtained in S2.
Step S6: the phase is converted into the true phase δ of γ + α + β from the phase difference α acquired in S2.
In the above formula, α, β, γ are all in units of ° (degrees), t is in units of s (seconds), f is in units of Hz (hertz), wm、
The unit of (b) is V (volt).
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for obtaining a partial discharge phase, comprising the steps of:
a) acquiring 220V alternating current from a maintenance power supply, and reducing the voltage into low-voltage alternating current;
b) acquiring the frequency f of low-voltage alternating current, defining a phase difference alpha as a phase position where the voltage of a maintenance power supply lags behind the voltage of equipment to be subjected to partial discharge detection, defining a phase difference beta as a phase position where the voltage of the low-voltage alternating current lags behind the voltage of the maintenance power supply, and calculating to obtain alpha and beta;
c) inputting the low-voltage alternating current into a voltage comparator, and converting a power frequency sinusoidal signal into a square wave signal by the voltage comparator;
d) inputting the square wave signal into a processor, outputting a voltage signal increased from 0V according to a fixed slope k by the processor after the processor detects a rising edge every time so as to convert the voltage signal into a sawtooth wave signal, wherein the value of k is to ensure that the amplitude of the sawtooth wave is within the input voltage range of the processor;
e) inputting the sawtooth wave signal into ultrahigh frequency signal sampling equipment, simultaneously acquiring the ultrahigh frequency signal and the sawtooth wave signal by the sampling equipment, and calculating the time t when partial discharge occurs according to the amplitude of the sawtooth wave signal;
f) and b, converting the time t of the partial discharge into a phase gamma according to the frequency f obtained in the step b:
γ＝360tf；
g) according to the phase difference alpha and beta obtained in the step b, converting the phase gamma into a real phase delta:
δ＝γ+α+β。
2. the method for obtaining the partial discharge phase according to claim 1, wherein the step c of converting the power frequency sinusoidal signal into the square wave signal is as follows:
the threshold value of the voltage comparator is 0V, when the voltage of the low-voltage alternating current is positive, the voltage comparator outputs a fixed positive voltage signal, and when the voltage of the low-voltage alternating current is negative, the voltage comparator outputs 0V.
3. The method for obtaining the partial discharge phase according to claim 1, wherein the method for calculating the time t when the partial discharge occurs in step e is as follows:
wherein, wmIs the amplitude of the sawtooth wave signal when the ultrahigh frequency signal has a maximum value.
4. The method for obtaining the partial discharge phase according to claim 1, wherein the method for calculating the time t when the partial discharge occurs in step e is as follows:
wherein,
is the average value of the amplitudes of the sawtooth signals.
5. An apparatus for acquiring a partial discharge phase, comprising:
the voltage reduction module is used for reducing the 220V alternating current voltage of the maintenance power supply into a low-voltage alternating current signal;
a voltage comparator for converting a sine wave into a square wave;
the processor is used for calculating data and converting the square wave into a sawtooth wave;
and the power supply module is used for rectifying the alternating current into direct current to supply power to the whole set of device.
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| CN202011559701.0A CN112731081A (en) | 2020-12-25 | 2020-12-25 | Method and device for acquiring partial discharge phase |
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| CN202011559701.0A CN112731081A (en) | 2020-12-25 | 2020-12-25 | Method and device for acquiring partial discharge phase |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113406454A (en) * | 2021-06-30 | 2021-09-17 | 平顶山学院 | Partial discharge live inspection system and method suitable for open-type transformer substation |
| CN113820540A (en) * | 2021-11-24 | 2021-12-21 | 中国电建集团华东勘测设计研究院有限公司 | Method and device for acquiring power frequency phase of partial discharge pulse |
| CN114280429A (en) * | 2021-11-12 | 2022-04-05 | 国网河北能源技术服务有限公司 | GIS partial discharge detection device |
| CN116298741A (en) * | 2023-03-14 | 2023-06-23 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406454A (en) * | 2021-06-30 | 2021-09-17 | 平顶山学院 | Partial discharge live inspection system and method suitable for open-type transformer substation |
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| CN114280429A (en) * | 2021-11-12 | 2022-04-05 | 国网河北能源技术服务有限公司 | GIS partial discharge detection device |
| CN113820540A (en) * | 2021-11-24 | 2021-12-21 | 中国电建集团华东勘测设计研究院有限公司 | Method and device for acquiring power frequency phase of partial discharge pulse |
| CN113820540B (en) * | 2021-11-24 | 2022-03-11 | 中国电建集团华东勘测设计研究院有限公司 | Method and device for acquiring power frequency phase of partial discharge pulse |
| CN116298741A (en) * | 2023-03-14 | 2023-06-23 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
| CN116298741B (en) * | 2023-03-14 | 2023-10-31 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
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Application publication date: 20210430 |