CN109085474B - A method and system for detecting the performance of a 35kV and below cable oscillating wave partial discharge measuring instrument - Google Patents
A method and system for detecting the performance of a 35kV and below cable oscillating wave partial discharge measuring instrument Download PDFInfo
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- CN109085474B CN109085474B CN201810980430.2A CN201810980430A CN109085474B CN 109085474 B CN109085474 B CN 109085474B CN 201810980430 A CN201810980430 A CN 201810980430A CN 109085474 B CN109085474 B CN 109085474B
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- 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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
本发明公开了一种检测35kV及以下电缆振荡波局部放电测量仪性能的方法及系统，包括：根据主控单元发出的控制指令设定实验参数并选择实验电路；根据设定的实验参数和选择的实验电路对振荡波局部放电测量仪对应的性能进行检测；测量回路获取振荡波局部放电测量仪对应的性能检测的响应信号并发送至主控单元；主控单元对所述响应信号进行分析处理，获取所述振荡波局部放电测量仪对应的性能检测数据。本发明可用于振荡波局部放电测量仪的入网检测、型式试验及到货抽检，能够规范振荡波局部放电测量仪的性能检测工作；并且能够可在计算机控制下完成关键项目的自动化、标准化检测，降低了检测过程中人员、设备等不确定因素的影响，提高了检测效率及准确度。
The present invention discloses a method and system for detecting the performance of an oscillating wave partial discharge measuring instrument for cables of 35kV and below, comprising: setting experimental parameters and selecting an experimental circuit according to a control instruction issued by a main control unit; detecting the corresponding performance of the oscillating wave partial discharge measuring instrument according to the set experimental parameters and the selected experimental circuit; the measuring circuit obtains a response signal of the performance detection corresponding to the oscillating wave partial discharge measuring instrument and sends it to the main control unit; the main control unit analyzes and processes the response signal to obtain the corresponding performance detection data of the oscillating wave partial discharge measuring instrument. The present invention can be used for network access detection, type test and arrival sampling inspection of oscillating wave partial discharge measuring instruments, and can standardize the performance detection work of oscillating wave partial discharge measuring instruments; and can complete the automated and standardized detection of key projects under computer control, reducing the influence of uncertain factors such as personnel and equipment during the detection process, and improving the detection efficiency and accuracy.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation equipment, in particular to a method and a system for detecting the performance of a cable oscillating wave partial discharge measuring instrument with the voltage of 35kV or below.
Background
In recent years, the application of the oscillatory wave partial discharge measuring instrument in the partial discharge measurement of the voltage class cable of 35kV and below is more and more advanced, and a few problems to be solved are exposed.
(1) Instrument performance lacks uniform standardization requirements
At present, the oscillatory wave partial discharge measuring instrument sold in the markets at home and abroad is lack of an effective performance detection method, a unified performance detection system is not established, instrument performance provided by each manufacturer is good and uneven, products with serious defects in some functional aspects flow into the market, and serious waste in manpower and material resources is caused to a using unit.
(2) The accuracy of the measurement results lacks judgment basis
At present, as the lack of an effective performance detection system judges the detection accuracy of the oscillatory wave partial discharge measuring instrument, the accuracy of some key test indexes is lower, and the design and manufacturing levels of some key indexes by equipment of various factories are inconsistent, so that the evaluation result of potential cable insulation defects by using units in the actual application process is deviated.
Therefore, a method for detecting the performance of the cable oscillating wave partial discharge measuring instrument of 35kV and below is required to detect the performance of the oscillating wave partial discharge measuring instrument.
Disclosure of Invention
The invention provides a method and a system for detecting the performance of a cable oscillating wave partial discharge measuring instrument with the voltage of 35kV or below, which are used for solving the problem of how to detect the performance of the oscillating wave partial discharge measuring instrument.
In order to solve the above-mentioned problems, according to one aspect of the present invention, there is provided a method for detecting performance of a cable oscillatory wave partial discharge measuring instrument of 35kV and below, the method comprising:
setting experimental parameters and selecting an experimental circuit according to a control instruction sent by a main control unit;
Detecting the corresponding performance of the oscillatory wave partial discharge measuring instrument according to the set experimental parameters and the selected experimental circuit;
The measuring loop obtains a response signal of performance detection corresponding to the oscillating wave partial discharge measuring instrument and sends the response signal to the main control unit;
And the main control unit analyzes and processes the response signals to obtain performance detection data corresponding to the oscillatory wave partial discharge measuring instrument.
Preferably, the performance corresponding to the oscillatory wave partial discharge measuring instrument comprises: partial discharge measurement characteristics, partial discharge positioning characteristics, and oscillating voltage wave characteristics.
Preferably, wherein detecting the partial discharge measurement characteristic of the oscillatory wave partial discharge measurement instrument includes:
Injecting a sinusoidal sweep frequency signal in a preset frequency range into an oscillating wave partial discharge measuring instrument, reading an amplitude-frequency characteristic curve of a response signal of the oscillating wave partial discharge measuring instrument at each frequency point, and calculating a 6dB bandwidth of the amplitude-frequency characteristic curve as a partial discharge measuring frequency band of the oscillating wave partial discharge measuring instrument;
And connecting a cable with a preset length threshold in parallel between a high-voltage output end and a grounding end of the oscillatory wave partial discharge measuring instrument, injecting a preset quantity of charges into two ends of a capacitor by using a standard calibrator, measuring a partial discharge background signal of the oscillatory wave partial discharge measuring instrument under the action of an oscillatory voltage wave with a preset voltage level, and determining a preset multiple of the amplitude of the partial discharge background signal as measurement sensitivity.
Preferably, wherein detecting the partial discharge positioning characteristic of the oscillatory wave partial discharge measuring instrument includes:
setting a typical insulation defect model as a positioning object, detecting and positioning and calculating partial discharge signals generated by preset defects by using the oscillatory wave partial discharge measuring instrument, and comparing a positioning calculation error with a preset error threshold value to determine the partial discharge positioning accuracy;
Detecting incident pulses and reflected pulses of the analog partial discharge signals injected at the cable test end by using the oscillatory wave partial discharge measuring instrument, performing positioning calculation, and determining whether the effective positioning length of partial discharge meets the requirement according to the positioning result of the oscillatory wave partial discharge measuring instrument;
And selecting a cable with the length consistent with the positioning blind area, accessing the cable to a high-voltage output end of the oscillatory wave partial discharge measuring instrument, and observing whether time-domain aliasing occurs between an incident pulse and a reflected pulse of a partial discharge analog signal injected at a cable testing end by using the oscillatory wave partial discharge measuring instrument so as to determine whether the positioning blind area meets the requirement.
Preferably, wherein detecting an oscillating voltage wave characteristic of the oscillating wave partial discharge meter includes:
measuring and calculating the time from zero potential boosting to the highest test voltage of the oscillation partial discharge measuring instrument by taking a pulse capacitor with preset capacitance as a load, and calculating the direct current charging speed so as to detect the direct current charging speed;
Measuring a damped oscillation voltage wave by using a pulse capacitor with preset capacitance as a load through an external standard resistor-capacitor voltage divider, calculating the relation between the amplitude of the oscillation wave and the oscillation period, and calculating the attenuation rate of the amplitude of the oscillation wave so as to detect the damping oscillation attenuation rate;
and taking a pulse capacitor with preset capacitance as a load, measuring a damped oscillation voltage wave through an external standard resistor-capacitor voltage divider, and judging whether the waveform characteristics of the damped oscillation voltage wave measured by the voltage divider are normal and consistent within the specified oscillation times so as to detect the continuous oscillation times.
Preferably, wherein the method further comprises:
and the response signal is subjected to analog-to-digital conversion by the acquisition unit and then is sent to the main control unit.
According to another aspect of the present invention, there is provided a system for detecting performance of a cable oscillatory wave partial discharge measurement meter of 35kV and below, the system comprising:
The main control unit is connected with the input end of the instruction processing unit and the output end of the loop measuring unit and is used for sending a control instruction to the instruction processing unit; for analysing the response signal acquired by the measuring circuit, acquiring performance detection data corresponding to the oscillatory wave partial discharge measuring instrument;
The instruction processing unit is connected with the input end of the detection unit and is used for receiving the control instruction, setting experimental parameters according to the control instruction and selecting an experimental circuit;
The detection unit is connected with the input end of the measuring loop and is used for detecting the performance corresponding to the oscillatory wave partial discharge measuring instrument according to the set experimental parameters and the selected experimental circuit;
And the measuring loop is used for acquiring a response signal of performance detection corresponding to the oscillatory wave partial discharge measuring instrument and sending the response signal to the main control unit.
Preferably, wherein the detection unit includes: the device comprises a partial discharge measurement characteristic detection module, a partial discharge positioning characteristic detection module and an oscillation voltage wave characteristic detection module.
Preferably, the partial discharge measurement characteristic detection module detects a partial discharge measurement characteristic of the oscillatory wave partial discharge measurement instrument, and includes:
The partial discharge measurement frequency band detection sub-module is used for injecting a sinusoidal sweep frequency signal in a preset frequency range into the oscillatory wave partial discharge measuring instrument, reading a amplitude-frequency characteristic curve of a response signal of the oscillatory wave partial discharge measuring instrument at each frequency point, and calculating a 6dB bandwidth of the amplitude-frequency characteristic curve as a partial discharge measurement frequency band of the oscillatory wave partial discharge measuring instrument;
the measuring sensitivity detection sub-module is used for connecting a cable with a preset length threshold value in parallel between a high-voltage output end and a grounding end of the oscillating wave partial discharge measuring instrument, injecting a preset quantity of charges into two ends of a capacitor by using a standard calibrator, measuring a partial discharge background signal of the oscillating wave partial discharge measuring instrument under the action of an oscillating voltage wave with a preset voltage level, and determining a preset multiple of the amplitude of the partial discharge background signal as the measuring sensitivity.
Preferably, the partial discharge positioning characteristic detection module detects a partial discharge positioning characteristic of the oscillatory wave partial discharge measuring instrument, and includes:
the partial discharge positioning accuracy detection sub-module is used for setting a typical insulation defect model as a positioning object, detecting and positioning and calculating partial discharge signals generated by preset defects by using the oscillatory wave partial discharge measuring instrument, and comparing a positioning calculation error with a preset error threshold value to determine the partial discharge positioning accuracy;
The partial discharge effective positioning length detection sub-module is used for detecting incident pulses and reflected pulses of the analog partial discharge signals injected at the cable test end by using the oscillation wave partial discharge measuring instrument and carrying out positioning calculation, and determining whether the effective positioning length of the partial discharge meets the requirement according to the positioning result of the oscillation wave partial discharge measuring instrument;
And the positioning blind area detection sub-module is used for selecting a cable with the length consistent with that of the positioning blind area to be connected to the high-voltage output end of the oscillatory wave partial discharge measuring instrument, and observing whether time domain aliasing occurs between an incident pulse and a reflected pulse of a partial discharge analog signal injected at the cable testing end by utilizing the oscillatory wave partial discharge measuring instrument so as to determine whether the positioning blind area meets the requirement.
Preferably, the oscillating voltage wave characteristic detecting module detects an oscillating voltage wave characteristic of the oscillating wave partial discharge measuring instrument, including:
The direct current charging speed detection sub-module is used for measuring and calculating the time from zero potential boosting to the highest test voltage of the oscillation partial discharge measuring instrument by taking a pulse capacitor with preset capacitance as a load, and calculating the direct current charging speed so as to detect the direct current charging speed;
The damping oscillation attenuation rate detection submodule is used for measuring damping oscillation voltage waves through an external standard resistor-capacitor voltage divider by taking a pulse capacitor with preset capacitance as a load, calculating the relation between the amplitude of the oscillation waves and the oscillation period, and calculating the attenuation rate of the amplitude of the oscillation waves so as to detect the damping oscillation attenuation rate;
And the continuous oscillation frequency detection sub-module is used for taking a pulse capacitor with preset capacitance as a load, measuring a damped oscillation voltage wave through an external standard resistor-capacitor voltage divider, and judging whether the waveform characteristics of the damped oscillation voltage wave measured by the voltage divider are normal and consistent within the specified oscillation frequency so as to detect the continuous oscillation frequency.
Preferably, wherein the system further comprises:
the acquisition unit is respectively connected with the output end of the detection unit and the input end of the main control unit and is used for carrying out analog-to-digital conversion on the response signals and then sending the response signals to the main control unit.
The invention provides a method and a system for detecting the performance of a cable oscillating wave partial discharge measuring instrument of 35kV and below, combing key technical indexes closely related to the use reliability and the measurement accuracy of the instrument by closely combining the technical principle and the field application condition of the oscillating wave partial discharge measuring instrument, analyzing the differentiation characteristics of the instrument and pressure-resistant and partial discharge measuring instruments, combining a large amount of measured data, and comprehensively and accurately embodying the performance detection of the special functions of the oscillating wave partial discharge measuring instrument, comprising the following steps: the detection of the partial discharge measurement characteristics, the partial discharge positioning characteristics and the oscillating voltage wave characteristics in 3 major categories can be used for network access detection, type test and arrival sampling inspection of the oscillating wave partial discharge measuring instrument, can standardize the performance detection work of the oscillating wave partial discharge measuring instrument, and is an effective technical control for owners buying the instrument; the invention can complete the automatic and standardized detection of key items under the control of the computer, reduces the influence of uncertain factors such as personnel, equipment and the like in the detection process, and improves the detection efficiency and accuracy.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method 100 for detecting performance of a cable oscillatory wave partial discharge meter of 35kV and below in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system 200 for detecting performance of a cable oscillating wave partial discharge meter at 35kV and below according to an embodiment of the invention;
fig. 3 is a functional schematic of a detection system according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 for detecting performance of a cable-oscillating wave partial discharge meter of 35kV and below according to an embodiment of the invention. As shown in fig. 1, the method for detecting the performance of the cable oscillating wave partial discharge measuring instrument of 35kV and below according to the embodiment of the invention includes: the detection of the partial discharge measurement characteristics, the partial discharge positioning characteristics and the oscillating voltage wave characteristics in 3 major categories can be used for network access detection, type test and arrival sampling inspection of the oscillating wave partial discharge measuring instrument, can standardize the performance detection work of the oscillating wave partial discharge measuring instrument, and is an effective technical control for owners buying the instrument; the invention can complete the automatic and standardized detection of key items under the control of the computer, reduces the influence of uncertain factors such as personnel, equipment and the like in the detection process, and improves the detection efficiency and accuracy. The method 100 for detecting the performance of the cable oscillating wave partial discharge measuring instrument of 35kV and below provided by the embodiment of the invention starts from step 101, and in step 101, experimental parameters are set according to a control instruction sent by a main control unit, and an experimental circuit is selected.
Preferably, in step 102, the performance corresponding to the oscillatory wave partial discharge measuring instrument is detected according to the set experimental parameters and the selected experimental circuit.
Preferably, the performance corresponding to the oscillatory wave partial discharge measuring instrument comprises: partial discharge measurement characteristics, partial discharge positioning characteristics, and oscillating voltage wave characteristics.
Preferably, wherein detecting the partial discharge measurement characteristic of the oscillatory wave partial discharge measurement instrument includes:
Injecting a sinusoidal sweep frequency signal in a preset frequency range into an oscillating wave partial discharge measuring instrument, reading an amplitude-frequency characteristic curve of a response signal of the oscillating wave partial discharge measuring instrument at each frequency point, and calculating a 6dB bandwidth of the amplitude-frequency characteristic curve as a partial discharge measuring frequency band of the oscillating wave partial discharge measuring instrument;
And connecting a cable with a preset length threshold in parallel between a high-voltage output end and a grounding end of the oscillatory wave partial discharge measuring instrument, injecting a preset quantity of charges into two ends of a capacitor by using a standard calibrator, measuring a partial discharge background signal of the oscillatory wave partial discharge measuring instrument under the action of an oscillatory voltage wave with a preset voltage level, and determining a preset multiple of the amplitude of the partial discharge background signal as measurement sensitivity.
Preferably, wherein detecting the partial discharge positioning characteristic of the oscillatory wave partial discharge measuring instrument includes:
setting a typical insulation defect model as a positioning object, detecting and positioning and calculating partial discharge signals generated by preset defects by using the oscillatory wave partial discharge measuring instrument, and comparing a positioning calculation error with a preset error threshold value to determine the partial discharge positioning accuracy;
Detecting incident pulses and reflected pulses of the analog partial discharge signals injected at the cable test end by using the oscillatory wave partial discharge measuring instrument, performing positioning calculation, and determining whether the effective positioning length of partial discharge meets the requirement according to the positioning result of the oscillatory wave partial discharge measuring instrument;
And selecting a cable with the length consistent with the positioning blind area, accessing the cable to a high-voltage output end of the oscillatory wave partial discharge measuring instrument, and observing whether time-domain aliasing occurs between an incident pulse and a reflected pulse of a partial discharge analog signal injected at a cable testing end by using the oscillatory wave partial discharge measuring instrument so as to determine whether the positioning blind area meets the requirement.
Preferably, wherein detecting an oscillating voltage wave characteristic of the oscillating wave partial discharge meter includes:
measuring and calculating the time from zero potential boosting to the highest test voltage of the oscillation partial discharge measuring instrument by taking a pulse capacitor with preset capacitance as a load, and calculating the direct current charging speed so as to detect the direct current charging speed;
Measuring a damped oscillation voltage wave by using a pulse capacitor with preset capacitance as a load through an external standard resistor-capacitor voltage divider, calculating the relation between the amplitude of the oscillation wave and the oscillation period, and calculating the attenuation rate of the amplitude of the oscillation wave so as to detect the damping oscillation attenuation rate;
and taking a pulse capacitor with preset capacitance as a load, measuring a damped oscillation voltage wave through an external standard resistor-capacitor voltage divider, and judging whether the waveform characteristics of the damped oscillation voltage wave measured by the voltage divider are normal and consistent within the specified oscillation times so as to detect the continuous oscillation times.
Preferably, in step 103, the measurement loop acquires a response signal of performance detection corresponding to the oscillatory wave partial discharge measuring instrument, and sends the response signal to the main control unit.
Preferably, in step 104, the main control unit performs analysis processing on the response signal to obtain performance detection data corresponding to the oscillating wave partial discharge measuring instrument.
Preferably, wherein the method further comprises:
and the response signal is subjected to analog-to-digital conversion by the acquisition unit and then is sent to the main control unit.
In the embodiment of the invention, the performance detection method of the voltage class oscillatory wave partial discharge measuring instrument with the voltage class of 35kV and below mainly comprises three detection contents of partial discharge measurement characteristics, partial discharge positioning characteristics and oscillation voltage waveform characteristics, wherein the partial discharge measurement characteristics detection comprises the following steps: two key detection contents of partial discharge measurement frequency band and partial discharge measurement sensitivity; the partial discharge positioning characteristic detection includes: the positioning error of the partial discharge source, the cable length capable of being effectively positioned and the positioning blind area of the partial discharge source are three key detection contents; the oscillating voltage wave characteristic detection includes: the direct current charging speed, the damping oscillation voltage attenuation rate and the continuous oscillation frequency are three key detection contents.
Partial discharge measurement band detection, comprising: and injecting a sine sweep frequency signal with a certain frequency range into the measured oscillatory wave partial discharge measuring instrument, wherein the sweep frequency signal needs to contain a frequency range of 100 kHz-10 MHz. And reading the waveform of the response signal of the tested instrument at each frequency point, drawing the amplitude-frequency characteristic curve of the tested instrument, and calculating the 6dB bandwidth of the amplitude-frequency characteristic curve to be used as the partial discharge measurement frequency band of the tested instrument.
Partial discharge measurement sensitivity detection, comprising: under laboratory conditions, a 10kV cable with a certain length is connected in parallel between a high-voltage output end and a grounding end of a tested instrument, and a standard calibrator is used for injecting a certain amount of charges at two ends of a capacitor to complete the calibration of the partial discharge quantity of the tested instrument. And measuring the partial discharge background signal under the action of an oscillating voltage wave with a specific voltage level, wherein the amplitude of the background signal is 2 times of the minimum discharge capacity which can be measured by the system, namely the measurement sensitivity.
Partial discharge positioning error detection, comprising: under laboratory conditions, a typical insulation defect model is set at a designated position with the length of not less than 400 m and at a 10kV designated position as a positioning object, a detected oscillation wave partial discharge measuring instrument is used for detecting and positioning and calculating partial discharge signals generated by preset defects, and a positioning calculation error is compared with an error limit value to finish judgment on the accuracy of the partial discharge positioning of the detected instrument.
Partial discharge effective positioning length detection, comprising: injecting a simulated partial discharge signal with a certain discharge capacity into a cable test end with the length consistent with the effective positioning length, detecting an incident pulse and a reflected pulse of the simulated partial discharge signal by a tested oscillating wave partial discharge measuring instrument, and performing positioning calculation, wherein if the tested instrument can effectively detect the incident pulse and the reflected pulse and the positioning result is displayed at the position of the test end under reasonable wave speed setting, the effective positioning length of partial discharge of the tested instrument meets the requirement; wherein the cable model is YJV-8.7/15KV-1 x 240MM2.
Partial discharge location blind area detects, includes: and selecting a 10kV cable with the length consistent with the positioning blind area, accessing the high-voltage output end of the oscillatory wave partial discharge measuring instrument, injecting partial discharge analog signals with certain discharge capacity into the testing end, measuring by the measured instrument, observing whether time domain aliasing occurs between incident pulses and reflected pulses of the analog signals, and if the time domain aliasing does not occur, indicating that the positioning blind area of the measured instrument meets the requirement.
Direct current charge speed detection includes: and (3) carrying out an oscillatory wave test by taking a pulse capacitor with a certain capacitance as a load, measuring and calculating the time from zero potential boosting to the highest test voltage of the tested instrument, and calculating the direct current charging speed of the tested instrument.
Damping oscillation decay rate detection, comprising: and (3) carrying out an oscillatory wave test by taking a pulse capacitor with a certain capacitance as a load, measuring a damped oscillatory voltage wave through an external standard resistor-capacitor voltage divider, and calculating the relation between the amplitude of the oscillatory wave and the oscillation period, thereby calculating the attenuation rate of the amplitude of the oscillatory wave. In the test, the amplitude attenuation rate of the oscillating wave is related to the load capacitance and the oscillation starting voltage, so the load capacitance and the starting voltage of the oscillating voltage wave should be reasonably selected in the research process.
The continuous oscillation frequency detection comprises the following steps: and (3) carrying out an oscillation wave test under a specific voltage by taking a pulse capacitor with a certain capacitance as a load, measuring a damped oscillation voltage wave through an external standard resistor-capacitor voltage divider, and if the waveform characteristics of the damped oscillation voltage wave measured by the voltage divider are normal and consistent within a specified oscillation frequency, passing the test.
Fig. 2 is a schematic diagram of a system 200 for detecting performance of a cable oscillating wave partial discharge measuring instrument at 35kV and below according to an embodiment of the invention. As shown in fig. 2, a system 200 for detecting performance of a cable oscillating wave partial discharge measuring instrument of 35kV and below according to an embodiment of the present invention includes: a main control unit 201, an instruction processing unit 202, a detection unit 203 and a measurement loop 204. Preferably, the main control unit 201 is connected to an input end of the instruction processing unit and an output end of the loop measurement unit, and is configured to send a control instruction to the instruction processing unit; and the system is used for analyzing and processing the response signals acquired by the measuring loop to acquire performance detection data corresponding to the oscillating wave partial discharge measuring instrument.
Preferably, the instruction processing unit 202 is connected to an input end of the detecting unit, and is configured to receive the control instruction, set experimental parameters according to the control instruction, and select an experimental circuit.
Preferably, the detecting unit 203 is connected to an input end of the measuring circuit, and is configured to detect performance corresponding to the oscillating wave partial discharge measuring instrument according to the set experimental parameters and the selected experimental circuit. Preferably, wherein the detecting unit 203 includes: a partial discharge measurement characteristic detection module 2031, a partial discharge positioning characteristic detection module 2032, and an oscillating voltage wave characteristic detection module 2033.
Preferably, the partial discharge measurement characteristic detecting module 2031 detects partial discharge measurement characteristics of an oscillating wave partial discharge measuring instrument, including: a partial discharge measurement band detection submodule 20311 and a measurement sensitivity detection submodule 20312.
Preferably, the partial discharge measurement frequency band detection submodule 20311 is configured to inject a sinusoidal sweep signal in a preset frequency range into the oscillatory wave partial discharge measurement apparatus, read an amplitude-frequency characteristic curve of a response signal of the oscillatory wave partial discharge measurement apparatus at each frequency point, and calculate a 6dB bandwidth of the amplitude-frequency characteristic curve as a partial discharge measurement frequency band of the oscillatory wave partial discharge measurement apparatus.
Preferably, the measurement sensitivity detection submodule 20312 is configured to connect a cable with a preset length threshold in parallel between a high-voltage output end and a ground end of the oscillating wave partial discharge measurement apparatus, inject a preset amount of charges into two ends of a capacitor with a standard calibrator, measure a partial discharge background signal of the oscillating wave partial discharge measurement apparatus under the action of an oscillating voltage wave with a preset voltage level, and determine a preset multiple of the amplitude of the partial discharge background signal as the measurement sensitivity.
Preferably, the partial discharge positioning characteristic detecting module 2032 detects a partial discharge positioning characteristic of the oscillatory wave partial discharge measuring instrument, including: a partial discharge positioning accuracy detection submodule 20321, a partial discharge effective positioning length detection submodule 20322, and a position blind area detection submodule 20323.
Preferably, the partial discharge positioning accuracy detecting submodule 20321 is configured to set a typical insulation defect model as a positioning object, detect and calculate a partial discharge signal generated by a preset defect by using the oscillating wave partial discharge measuring instrument, and compare a positioning calculation error with a preset error threshold value to determine the positioning accuracy of the partial discharge.
Preferably, the effective positioning length detection submodule 20322 is configured to detect an incident pulse and a reflected pulse of an analog partial discharge signal injected at a cable test end by using the oscillation wave partial discharge measurement instrument and perform positioning calculation, and determine whether the effective positioning length of the partial discharge meets the requirement according to a positioning result of the oscillation wave partial discharge measurement instrument.
Preferably, the location blind area detection submodule 30323 is configured to select a cable with a length consistent with that of the location blind area, to access the high-voltage output end of the oscillating wave partial discharge measuring instrument, and observe whether time-domain aliasing occurs between an incident pulse and a reflected pulse of a partial discharge analog signal injected at the cable testing end by using the oscillating wave partial discharge measuring instrument, so as to determine whether the location blind area meets the requirement.
Preferably, the oscillation voltage wave characteristic detection module 2033 detects an oscillation voltage wave characteristic of the oscillation wave partial discharge measurement apparatus, and includes: a direct current charging speed detection submodule 20331, a ringing decay rate detection submodule 20332, and a continuous oscillation number detection submodule 20333.
Preferably, the dc charging speed detecting submodule 20331 is configured to calculate a dc charging speed by measuring a time for the oscillating partial discharge meter to boost from zero potential to a highest test voltage with a pulse capacitor with a preset capacitance as a load, so as to detect the dc charging speed.
Preferably, the damping oscillation attenuation rate detection submodule 20332 is configured to measure a damping oscillation voltage wave with a pulse capacitor with a preset capacitance as a load through an external standard resistor-capacitor voltage divider, calculate a relationship between an oscillation wave amplitude and an oscillation period, and calculate an attenuation rate of the oscillation wave amplitude so as to detect the damping oscillation attenuation rate.
Preferably, the continuous oscillation frequency detection submodule 20333 is configured to measure the damped oscillation voltage wave by using a pulse capacitor with a preset capacitance as a load through an external standard resistor-capacitor voltage divider, and determine whether the waveform characteristics of the damped oscillation voltage wave measured by the voltage divider are normal and consistent within the specified oscillation frequency, so as to detect the continuous oscillation frequency.
Preferably, the measurement loop 204 is configured to obtain a response signal of performance detection corresponding to the oscillating wave partial discharge measurement apparatus, and send the response signal to the main control unit.
Preferably, wherein the system further comprises: the acquisition unit is respectively connected with the output end of the detection unit and the input end of the main control unit and is used for carrying out analog-to-digital conversion on the response signals and then sending the response signals to the main control unit.
In the embodiment of the invention, on the basis of completing the research of the performance detection method of the oscillatory wave partial discharge measuring instrument, a performance detection system is provided according to the test method provided in the scheme. The performance detection system consists of a strong current part and a weak current part, wherein the strong current part comprises a YJV-8.7/15KV-1 x 240MM2 cable with a certain length, a capacitor bank comprising capacitors with different capacities, a high-voltage power supply system, a resonant reactor and other core components; the weak current system consists of an embedded industrial control system, a modularized functional test circuit, a data acquisition module, preassembled software and other core parts.
Fig. 3 is a functional schematic of a detection system according to an embodiment of the present invention. As shown in fig. 3, the embedded industrial control system (main control unit) is preloaded with customized measurement and control software, so that functions of generation of control signals, classification and storage of uploaded data and the like can be realized. The working mode is as follows: during actual detection, the embedded industrial control system outputs an instruction to a control instruction sending module (instruction processing unit), the module outputs two paths of control signals, one path is a circuit selection instruction, the other path is a parameter setting instruction, the circuit selection instruction is input into a program-controlled multi-way switch, and program-controlled selection and switching of 3 sets of hardware circuits (a partial discharge measurement characteristic detection module, a partial discharge positioning characteristic detection module and an oscillating voltage wave characteristic detection module) and an expansion function module can be realized; the parameter setting instruction can carry out self-defined setting on working parameters of each hardware circuit, and each hardware circuit has the response capability of a remote control signal and can automatically adjust parameters of an output signal under the requirement of the parameter setting instruction. The signal generating circuit is fast connected with the measuring loop corresponding to each detection item through a standard interface. And the response signal of the measuring loop is input into a collecting system (collecting unit), the collecting system uploads data to an embedded industrial control system after completing A/D conversion, and finally preloaded analysis software is used for summarizing and analyzing the uploaded data to give out the detection results of various test items, so that the performance detection of the oscillatory wave partial discharge measuring instrument is completed.
The system 200 for detecting the performance of the cable oscillating wave partial discharge measuring instrument of 35kV and below according to the embodiment of the present invention corresponds to the method 100 for detecting the performance of the cable oscillating wave partial discharge measuring instrument of 35kV and below according to another embodiment of the present invention, and is not described herein.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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| CN110824405B (en) * | 2019-10-30 | 2022-03-18 | 国网新疆电力有限公司哈密供电公司 | Amplitude-frequency characteristic detection system and method of capacitive voltage transformer |
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| ITPR20060054A1 (en) * | 2006-06-13 | 2007-12-14 | Techimp S R L | INSTRUMENT AND PROCEDURE FOR DETECTION OF PARTIAL ELECTRIC DISCHARGES IN AN ELECTRIC SYSTEM |
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