CN109406958B - Method for evaluating sensitivity of ultrasonic partial discharge instrument - Google Patents
Method for evaluating sensitivity of ultrasonic partial discharge instrument Download PDFInfo
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- CN109406958B CN109406958B CN201811063703.3A CN201811063703A CN109406958B CN 109406958 B CN109406958 B CN 109406958B CN 201811063703 A CN201811063703 A CN 201811063703A CN 109406958 B CN109406958 B CN 109406958B
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- partial discharge
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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
- G01R31/1227—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 of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention relates to an evaluation device and an evaluation method for the sensitivity of an ultrasonic partial discharge instrument, and belongs to the technical field of partial discharge detection of power equipment. The device for evaluating the sensitivity of the ultrasonic partial discharge instrument comprises a programmable signal generator, a digital oscilloscope, an ultrasonic transducer and an evaluation partial discharge instrument to be tested; an ultrasonic transducer for generating a standard ultrasonic signal for evaluation; the programmable signal generator generates a sinusoidal signal with specific frequency and specific amplitude by adopting a standard evaluation ultrasonic signal in a standard ultrasonic transducer; the digital oscilloscope is used for acquiring sinusoidal signals output by the programmable signal generator; the programmable signal generator is in signal connection with the ultrasonic transducer, and the ultrasonic transducer is in signal connection with the partial discharge instrument to be evaluated. The device of the invention has simple structure and is easy to realize. The method is easy to implement, and compared with the traditional evaluation method of the partial discharge instrument, the result accuracy is higher.
Description
Technical Field
The invention relates to an evaluation device and an evaluation method for the sensitivity of an ultrasonic partial discharge instrument, and belongs to the technical field of partial discharge detection of power equipment.
Background
The partial discharge detector is a common instrument for diagnosing the insulation condition of high-voltage power equipment, and the quantity, amplitude, polarity and other parameters of detected partial discharge signals are important for aging judgment, breakdown indexes and equipment operation and detection of an insulation system. At present, local discharge detectors at home and abroad have a plurality of products and good and uneven performance quality, so that the detector has important significance for the unified test evaluation of the local discharge detector. In the power industry, relevant evaluation standards and specifications for the ultrasonic partial discharge instrument are not established, and the existing relevant test methods and devices have certain limitations, so that the sensitivity evaluation device and the sensitivity evaluation method for the ultrasonic partial discharge instrument are designed.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides an evaluation device and an evaluation method for the sensitivity of an ultrasonic partial discharge instrument. The invention is realized by the following technical scheme.
An evaluation device for the sensitivity of an ultrasonic partial discharge instrument comprises a programmable signal generator, a digital oscilloscope, an ultrasonic transducer and an evaluation partial discharge instrument to be tested; an ultrasonic transducer for generating a standard ultrasonic signal for evaluation; the programmable signal generator adopts a standard evaluation ultrasonic signal in the ultrasonic transducer to generate a sinusoidal signal with specific frequency and specific amplitude; the digital oscilloscope is used for acquiring sinusoidal signals output by the programmable signal generator; the programmable signal generator is in signal connection with the ultrasonic transducer, and the ultrasonic transducer is in signal connection with the partial discharge instrument to be evaluated.
An evaluation device for the sensitivity of an ultrasonic partial discharge instrument comprises a programmable signal generator, a digital oscilloscope, an ultrasonic transducer and an evaluation partial discharge instrument to be tested; an ultrasonic transducer for generating a standard ultrasonic signal for evaluation; the programmable signal generator generates a sinusoidal signal with specific frequency and specific amplitude by adopting a standard evaluation ultrasonic signal in a standard ultrasonic transducer; the digital oscilloscope is used for acquiring sinusoidal signals output by the programmable signal generator; the programmable signal generator is in signal connection with the ultrasonic transducer, and the ultrasonic transducer is in signal connection with the partial discharge instrument to be evaluated.
An evaluation method of an evaluation device for the sensitivity of an ultrasonic partial discharge instrument comprises the following specific steps:
step 1, obtaining the frequency response characteristic H of the ultrasonic transducer according to the frequency characteristic of the standard ultrasonic transducerEnergy converter(f)；
Step 2, setting a sine signal with a frequency value f ranging from 1kHz to 200kHz and setting a reference voltage VReference toThen according to an amplitude compensation formula
Wherein HEnergy converter(f) Calculating a set of amplitude values V for the frequency response characteristics of the ultrasonic transducer obtained in step 1CompensationAnd storing;
step 3, adjusting the amplitude value of the sine signal output by the programmable signal generator to VCompensationInjecting the sine signal into an ultrasonic transducer, transmitting an output signal of the ultrasonic transducer to an evaluation partial discharge instrument to be tested, reading and recording output data of the evaluation partial discharge instrument to be tested, and determining the central frequency of the evaluation partial discharge instrument to be tested according to the frequency value of the sine signal output by a programmable signal generator and the output data of the evaluation partial discharge instrument to be tested;
step 4, adjusting the frequency value of the sinusoidal signal of the programmable signal generator to be in the evaluation partial discharge instrument to be testedThe heart frequency is measured, the sine signal is injected into the ultrasonic transducer, and the output signal of the programmable signal generator is collected by a digital oscilloscope and the amplitude V is recorded1；
And 5, reducing the amplitude value of the sinusoidal signal output by the programmable signal generator to 1dB of the output indication of the partial discharge instrument to be evaluated by reducing the amplitude value, acquiring the output signal of the programmable signal generator by using a digital oscilloscope and recording the amplitude value V2And then, the sensitivity of the partial discharge analyzer to be tested is recorded as: Δ V ═ V1-V2。
The invention has the beneficial effects that:
(1) the device of the invention has simple structure and is easy to realize.
(2) The method is easy to implement, and compared with the traditional evaluation method of the partial discharge instrument, the result accuracy is higher.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a schematic flow diagram of the present invention;
fig. 3 is a graph plotting frequency response characteristics at step 3 in embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
As shown in fig. 1, the evaluation device for the sensitivity of the ultrasonic partial discharge instrument comprises a programmable signal generator, a digital oscilloscope, an ultrasonic transducer and an evaluation partial discharge instrument to be tested; an ultrasonic transducer for generating a standard ultrasonic signal for evaluation; the programmable signal generator generates a sinusoidal signal with specific frequency and specific amplitude by adopting a standard evaluation ultrasonic signal in a standard ultrasonic transducer; the digital oscilloscope is used for acquiring sinusoidal signals output by the programmable signal generator; the programmable signal generator is in signal connection with the ultrasonic transducer, and the ultrasonic transducer is in signal connection with the partial discharge instrument to be evaluated.
As shown in fig. 2, the evaluation method of the evaluation device for the sensitivity of the ultrasonic partial discharge instrument specifically includes the following steps:
step 1,Obtaining the frequency response characteristic H of the ultrasonic transducer according to the frequency characteristic of the standard ultrasonic transducerEnergy converter(f)；
Step 2, setting a sine signal with a frequency value f ranging from 20kHz to 200kHz and a step length of 10kHz, and setting a reference voltage VReference toIs 5V, and then according to the amplitude compensation formula
Wherein HEnergy converter(f) Calculating and storing a group of amplitude values V compensation for the frequency response characteristics of the ultrasonic transducer obtained in the step 1; specific data are shown in table 1;
TABLE 1
| Frequency value (f/kHz) | HEnergy converter(f)(dB) | VCompensation(V) |
| 20 | -80 | 31.55 |
| 30 | -77 | 22.33 |
| 40 | -72 | 12.56 |
| 50 | -68 | 7.92 |
| 60 | -70 | 9.98 |
| 70 | -68 | 7.92 |
| 80 | -65 | 5.61 |
| 90 | -64 | 5.00 |
| 100 | -65 | 5.61 |
| 110 | -64 | 5.00 |
| 120 | -66 | 6.29 |
| 130 | -68 | 7.92 |
| 140 | -69 | 8.89 |
| 150 | -68 | 7.92 |
| 160 | -69 | 8.89 |
| 170 | -71 | 11.19 |
| 180 | -73 | 14.09 |
| 190 | -70 | 9.98 |
| 200 | -80 | 31.55 |
Step 3, adjusting the amplitude value of the sine signal output by the programmable signal generator to VCompensationInjecting the sine signal into the ultrasonic transducer, transmitting the output signal of the ultrasonic transducer to the partial discharge instrument to be evaluated, reading and recording the output data of the partial discharge instrument to be evaluated, and automatically drawing the frequency response characteristic according to the frequency value of the sine signal output by the programmable signal generator and the output data of the partial discharge instrument to be evaluatedA characteristic curve (a frequency response characteristic curve is shown in fig. 3), it can be seen from fig. 3 that the frequency corresponding to the maximum reading of the partial discharge instrument to be evaluated is 40kHz, and the central frequency of the partial discharge instrument to be evaluated is determined to be 40 kHz;
step 4, adjusting the frequency value of the sine signal of the programmable signal generator to be the central frequency of the partial discharge instrument to be evaluated, injecting the sine signal into the ultrasonic transducer, simultaneously collecting the output signal of the programmable signal generator by using a digital oscilloscope and recording the amplitude V1Amplitude V16.635 mV;
and 5, reducing the amplitude value of the sinusoidal signal output by the programmable signal generator to 1dB of the output indication of the partial discharge instrument to be evaluated by reducing the amplitude value, acquiring the output signal of the programmable signal generator by using a digital oscilloscope and recording the amplitude value V2Amplitude V2And 5.635mV, the sensitivity of the partial discharge analyzer to be tested is recorded as: Δ V ═ V1-V2The sensitivity Δ V was 1 mV/dB.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (1)
1. An evaluation method of an evaluation device for the sensitivity of an ultrasonic partial discharge instrument is characterized by comprising the following specific steps:
step 1, obtaining the frequency response characteristic of an ultrasonic transducer according to the frequency characteristic of a standard ultrasonic transducer
；
Step 2, setting frequency valuefA sinusoidal signal ranging from 1kHz to 200kHz, and setting a reference voltageV Reference toThen according to an amplitude compensation formula
Wherein
Calculating a set of amplitude values for the frequency response characteristics of the ultrasonic transducer obtained in step 1
And storing;
step 3, adjusting the amplitude value of the sine signal output by the programmable signal generator to
Injecting the sine signal into an ultrasonic transducer, transmitting an output signal of the ultrasonic transducer to an evaluation partial discharge instrument to be tested, reading and recording output data of the evaluation partial discharge instrument to be tested, and determining the central frequency of the evaluation partial discharge instrument to be tested according to the frequency value of the sine signal output by a programmable signal generator and the output data of the evaluation partial discharge instrument to be tested;
step 4, adjusting the frequency value of the sine signal of the programmable signal generator to be the central frequency of the partial discharge instrument to be evaluated, injecting the sine signal into the ultrasonic transducer, simultaneously collecting the output signal of the programmable signal generator by using a digital oscilloscope and recording the amplitude valueV 1；
And 5, reducing the amplitude value of the sinusoidal signal output by the programmable signal generator to 1dB of the output indication of the partial discharge instrument to be evaluated by reducing the amplitude value, acquiring the output signal of the programmable signal generator by using a digital oscilloscope and recording the amplitude valueV 2And then, the sensitivity of the partial discharge analyzer to be tested is recorded as:
。
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| JPH09184869A (en) * | 1995-12-28 | 1997-07-15 | Sumitomo Electric Ind Ltd | Method for inducing partial discharge by ultrasonic wave |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105223529A (en) * | 2015-10-20 | 2016-01-06 | 国家电网公司 | For calibrating installation and the calibration method thereof of ultrasound wave local discharge sensor performance |
| CN205539425U (en) * | 2016-03-17 | 2016-08-31 | 广州供电局有限公司 | Monitoring instrument signal calibration equipment is put in contact ultrasonic wave office |
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| CN107064846A (en) * | 2016-12-12 | 2017-08-18 | 国网北京市电力公司 | The sensitivity detection method and device of live testing apparatus for local discharge |
| CN108519572B (en) * | 2018-05-14 | 2023-09-26 | 昆明理工大学 | Evaluation device and evaluation method for transient ground voltage partial discharge instrument |
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| CN101762318A (en) * | 2010-01-21 | 2010-06-30 | 上海大学 | Optical fiber extrinsic Fabry-Perot interference ultrasonic sensing and detection device |
| CN102360059A (en) * | 2011-09-23 | 2012-02-22 | 上海市电力公司 | Power transmission and distribution line partial discharge fault on-line detection method and apparatus thereof |
| KR101608964B1 (en) * | 2014-11-12 | 2016-04-04 | 지투파워(주) | A distribution board, motor control panel and cabinet panel with a detecting system for condition using ultra-sonic and TEV probes |
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