CN113504498B - Performance detection method and system of partial discharge intelligent sensing terminal - Google Patents
Performance detection method and system of partial discharge intelligent sensing terminal Download PDFInfo
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Abstract
The invention discloses a performance detection method and system of a partial discharge intelligent sensing terminal, aiming at the problems that the existing partial discharge intelligent sensing terminal is lack of performance evaluation indexes and cannot be evaluated and the performance is unknown during operation. The invention can establish a set of all-station public intelligent monitoring and auxiliary control mechanism for the partial discharge intelligent sensing terminal, provide a uniform communication interface, reduce the intervention of personnel and really realize intellectualization, automation and wireless; the method also provides guarantee for the reliable operation of the intelligent sensor and provides criteria for the network access detection of the intelligent sensor.
Description
Technical Field
The invention relates to an evaluation technology of a partial discharge intelligent sensing terminal, in particular to a performance detection method and system of the partial discharge intelligent sensing terminal.
Background
In the aspect of online monitoring of power transformation equipment, although a plurality of ultrahigh-frequency sensors, high-frequency current sensors and ultrasonic sensors for discharge detection of a GIS and a transformer are configured in a transformer substation at present, and ultrasonic sensors and transient ground wave sensors widely applied to switch cabinet equipment are still independent information isolated island devices without intelligent conversation functions at present, critical fault information and decisions need to be manually concerned, understood and processed with information of the equipment, and the requirement of intelligent operation management of an intelligent transformer substation is not met at all. The intelligent sensing terminal is provided with a bidirectional communication means with an external system, and a sensor for sending measurement and state information, receiving and processing an external command. For example, GIS ultrahigh frequency partial discharge detection intelligent sensors, switch cabinet partial discharge detection intelligent sensors and the like which are already applied in the current market. The intelligent sensor automatically identifies, positions, tracks and monitors the equipment in real time through the technology of the Internet of things, triggers corresponding events and realizes real-time management and control of the equipment. On the basis of the intelligent sensing terminals, a set of all-station public intelligent monitoring and auxiliary control system is gradually built, so that the requirements of intelligent monitoring, intelligent judgment, intelligent management and intelligent verification are met, the intervention of personnel is reduced, and the intelligent substation construction target of intelligent operation and automatic control is really realized.
With the attention of the power grid operation and maintenance department to online monitoring and intelligent operation and inspection, intelligent terminals with various monitoring functions are gradually popularized to enter the detection and operation and inspection services of power grid equipment, and mainly comprise four major products, namely an Ultra High Frequency (UHF) intelligent terminal, a High Frequency (HF) intelligent terminal, an Ultrasonic wave (AE) intelligent terminal and a Transient Earth Voltage (TEV) intelligent terminal.
At present, various state monitoring terminals of a partial discharge intelligent sensing terminal complete data acquisition of the state of power equipment on line, and a station end state monitoring platform is mainly a software system and realizes the following functions: the IEC 61850 is uniformly used for collecting, processing, analyzing, storing and diagnosing various intelligent component data, a uniform IEC 61850-based communication interface is provided for the outside, and the in-station data and remote data platform are communicated. However, the performance of each intelligent sensor is lack of evaluation indexes, and the intelligent sensor cannot be evaluated. The former centralized online monitoring device adopts a bus type working mode, divides the power transformation equipment into a plurality of areas according to geographical positions, respectively collects and selects signals, and then transmits the selected analog signals into a host through a multi-core shielded cable. And the host computer performs cycle detection and processing. The wiring is complicated, information is manually processed, quantifiable indexes are lacked, and the influence of objective factors is large. The existing intelligent sensing terminal removes a complex lead, is powered by a battery, simplifies equipment, provides a uniform IEC 61850-based communication interface for the outside, adopts wireless communication, and really realizes wireless and automatic communication. The centralized online monitoring system has the defects of multiple detection devices, wide projects and difficult and complicated field lead. At present, sensing units of sensors for on-line monitoring of power transformation equipment are still independent and do not have an intelligent conversation function, key fault information and decisions need to be manually concerned, understood and processed with information of the equipment, time consumption is long, manpower is wasted, human influence factors are large, and quantifiable indexes are lacked. The intelligent sensor automatically identifies, positions, tracks and monitors the equipment in real time through the Internet of things technology, triggers corresponding events and realizes real-time management and control of the equipment. On the basis of the intelligent sensing terminals, a set of all-station public intelligent monitoring and auxiliary control system is gradually established to meet the requirements of intelligent monitoring, intelligent judgment, intelligent management and intelligent verification, but the existing intelligent sensing terminals lack quantifiable evaluation indexes.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, a performance detection method and system of a partial discharge intelligent sensing terminal are provided. The invention can realize the test of a plurality of performance evaluation indexes including sensitivity, establishes a set of all-station public intelligent monitoring and auxiliary control mechanism for the partial discharge intelligent sensing terminal, provides a uniform communication interface, reduces the intervention of personnel, and really realizes intellectualization, automation and wireless; the reliable operation of the intelligent sensor is also guaranteed, and a criterion is provided for the network access detection of the intelligent sensor.
In order to solve the technical problems, the invention adopts the technical scheme that:
a performance detection method of a partial discharge intelligent sensing terminal comprises the following steps of:
a1 Record the noise level V of the measured partial discharge intelligent sensing terminal noise Setting an initial test amplitude V Host ；
A2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Host The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V test Based on noise level V noise Judging whether the tested partial discharge intelligent sensing terminal tests the current test amplitude V Host Measurable, if measured partial discharge intelligent perception terminal to present test amplitude V Host Can be measured, then the current test amplitude V is measured Host Reduced as new current test amplitude V Host Skipping to execute the step A2); otherwise, the last current test amplitude V is used Host Minimum measurement capable of being measured by partial discharge intelligent sensing terminalTrial amplitude V s ；
A3 Based on the minimum test amplitude V s Determining electric field intensity value E of placement position of measured partial discharge intelligent sensing terminal s And applying the electric field intensity value E s And outputting the detection sensitivity value as the detection sensitivity value of the detected partial discharge intelligent sensing terminal.
Optionally, in the step A2), it is determined whether the tested partial discharge intelligent sensing terminal is applied to the current test amplitude V Host When the intelligent sensing terminal can be measured, the current test amplitude V of the tested partial discharge intelligent sensing terminal is judged Host The measurable conditions are:
V test >2×V noise
in the above formula, V test For the current detected signal amplitude, V noise And the noise level of the measured partial discharge intelligent sensing terminal is obtained.
Optionally, determining the electric field intensity value E at the place where the measured partial discharge intelligent sensing terminal is placed in the step A2) s Comprises the following steps: placing an intelligent sensor at the opening of the GTEM chamber, and adjusting the amplitude of the output voltage of the calibration source to be the minimum test amplitude V s Obtaining the minimum test amplitude V of the output voltage amplitude of the calibration source of the intelligent sensor s Voltage response of time V Mr Then according to E s ＝V Mr /H ref Calculating to obtain the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed s In which H ref Is the effective height of the intelligent sensor.
Optionally, the method further comprises a step of linearity testing:
b1 Record the noise level V of the measured partial discharge intelligent sensing terminal noise Initializing an iteration variable i to 1, and setting an initial test amplitude V Hosti ；
B2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Hosti The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V testi Based on the noise level V noise Determining the current testAmplitude V Hosti And detecting the signal amplitude V testi If the test data pair is a pair of valid test data pairs, the current test amplitude V is determined Hosti Added as new current test amplitude V Hosti Skipping to execute the step B2); otherwise, skipping to execute the next step;
b3 Draw the obtained n pairs of effective test data into a curve graph by taking the test amplitude and the detection signal amplitude as coordinate axes respectively, and find the test amplitude corresponding to the top of the linear region in the curve as a linearity peak point V e ；
B4 Based on the linearity peak point V e Determining the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed e And applying the electric field intensity value E e And outputting the linear detection value as the detection linearity value of the detected partial discharge intelligent sensing terminal.
Optionally, the current test amplitude V is judged in step B2) Hosti Detecting the signal amplitude V testi Judging whether the current test amplitude V is the pair of effective test data Hosti Detecting the signal amplitude V testi The conditions for a valid test data pair are:
V testi >2×V noise
in the above formula, V testi For the current detected signal amplitude, V noise The noise level of the measured partial discharge intelligent sensing terminal is obtained.
Optionally, in step B2), before performing step B2), determining a current detection signal amplitude V testi Last detection signal amplitude V testi-1 If the change rate is smaller than the preset threshold value, and skipping to execute the step B2 only when the change rate is not smaller than the preset threshold value, otherwise skipping to execute the next step.
Optionally, the method further comprises the step of data stability testing: the method comprises the steps that a tested partial discharge intelligent sensing terminal is adjusted to a normal working mode and continuously runs for a specified time, a test value of background noise of the tested partial discharge intelligent sensing terminal is called regularly according to a specified protocol within the specified time, and the test value of the background noise is an electric field measurement value near a sensor under the state that a signal source is closed; grouping all the test data in the specified duration according to the time length, then solving the average value mu and the standard deviation sigma between all the groups of data, if the occupation ratio of the electric field measurement numerical value within mu +/-3 sigma exceeds a preset threshold value, judging that the tested partial discharge intelligent sensing terminal passes the stability evaluation, otherwise, judging that the tested partial discharge intelligent sensing terminal does not pass the stability evaluation.
Optionally, the method further comprises a step of testing data reliability: respectively adjusting the tested partial discharge intelligent sensing terminal to a normal working mode, carrying out temperature and humidity environment testing and EMC response testing, and respectively calling a testing numerical value of background noise of the tested partial discharge intelligent sensing terminal in the temperature and humidity environment testing and the EMC response testing, wherein the testing numerical value of the background noise is an electric field measurement numerical value near a sensor in a state of closing a signal source output; grouping all the test data in the specified time length according to the time length, then solving the average value among all the groups of data, judging that the tested partial discharge intelligent sensing terminal does not pass the data reliability test if the error between any electric field measurement value under the temperature and humidity environment test and the average value of the corresponding group exceeds a preset threshold value or the error between any electric field measurement value under the EMC response test and the average value of the corresponding group exceeds a preset threshold value, and otherwise, judging that the tested partial discharge intelligent sensing terminal passes the data reliability test.
In addition, the invention also provides a performance detection system of the partial discharge intelligent sensing terminal, which comprises an upper computer, a program control signal source, a coupling device and a protocol conversion device, wherein the upper computer is connected with the control end of the program control signal source, the output end of the program control signal source is connected with the coupling device, the protocol conversion device comprises a connecting terminal used for being connected with the measured partial discharge intelligent sensing terminal arranged in the coupling device, the protocol conversion device is connected with the upper computer, and a microprocessor of the upper computer is programmed or configured to execute the performance detection method of the partial discharge intelligent sensing terminal.
In addition, the present invention also provides a computer readable storage medium having stored therein a computer program programmed or configured to execute the performance detection method of the partial discharge intelligent sensing terminal.
Compared with the prior art, the invention has the following advantages: aiming at the problems that the existing intelligent sensing terminal for partial discharge is lack of performance evaluation indexes and cannot be evaluated and the performance is unknown during operation, the performance evaluation method for the intelligent sensing terminal can realize the test of a plurality of performance evaluation indexes including sensitivity, establishes a set of all-station public intelligent monitoring and auxiliary control mechanism for the intelligent sensing terminal for partial discharge, provides a uniform communication interface, reduces the intervention of personnel, and really realizes intellectualization, automation and wirelessness; the reliable operation of the intelligent sensor is also guaranteed, and a criterion is provided for the network access detection of the intelligent sensor.
Drawings
FIG. 1 is a flow chart of sensitivity testing in an embodiment of the present invention.
FIG. 2 is a schematic diagram of a sensitivity test in an embodiment of the invention.
FIG. 3 is a schematic diagram illustrating the principle of the electric field strength test in the embodiment of the present invention.
FIG. 4 is a flowchart of a linearity test in an embodiment of the invention.
FIG. 5 is a schematic diagram of a linearity test in an embodiment of the present invention.
FIG. 6 is a schematic diagram of a data stability test in an embodiment of the invention.
FIG. 7 is a schematic diagram of a data reliability test in an embodiment of the invention.
Fig. 8 is a wiring diagram for testing transmission impedance of the sensor in the embodiment of the invention.
FIG. 9 is a wiring diagram of a test for detecting frequency in an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the performance detection method of the partial discharge intelligent sensing terminal of the embodiment includes the steps of:
a1 Record the noise level V of the measured partial discharge intelligent sensing terminal noise Setting up the beginningInitial test amplitude V Host (in this example, the value is 100V, and the sensitivity is measured from 100V);
a2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Host The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V test Based on the noise level V noise Judging whether the tested partial discharge intelligent sensing terminal tests the current test amplitude V Host Measurable, if measured partial discharge intelligent perception terminal to present test amplitude V Host Can be measured, then the current test amplitude V is measured Host Reduced as new current test amplitude V Host Skipping to execute the step A2); otherwise, the last current test amplitude V is used Host Measurable minimum test amplitude V serving as measured partial discharge intelligent sensing terminal s ；
A3 Based on the minimum test amplitude V s Determining the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed s And the electric field intensity value E is measured s And outputting the partial discharge detection sensitivity value as the detection sensitivity value of the detected partial discharge intelligent sensing terminal.
Referring to fig. 2, in step A2) of this embodiment, it is determined whether the tested partial discharge intelligent sensing terminal tests the current test amplitude V Host When the intelligent sensing terminal can be measured, the current test amplitude V of the tested partial discharge intelligent sensing terminal is judged Host The measurable conditions were:
V test >2×V noise
in the above formula, V test For the current detected signal amplitude, V noise The noise level of the measured partial discharge intelligent sensing terminal is obtained.
In this embodiment, the electric field intensity value E at the place where the detected partial discharge intelligent sensing terminal is placed is determined in step A2) s Comprises the following steps: referring to fig. 3, the intelligent sensor is placed at the opening of the GTEM cell, and the amplitude of the output voltage of the calibration source is adjusted to be the minimum test amplitude V s Obtaining the minimum measurement of the output voltage amplitude of the intelligent sensor at the calibration sourceTrial amplitude V s Voltage response of time V Mr Then according to E s ＝V Mr /H ref Calculating to obtain the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed s In which H is ref Is the effective height of the intelligent sensor.
As shown in fig. 4, the present embodiment further includes a step of linearity testing:
b1 Record the noise level V of the measured partial discharge intelligent sensing terminal noise Initializing an iteration variable i to 1, and setting an initial test amplitude V Hosti (initially 0 in this example, starting from 0V);
b2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Hosti The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V testi Based on the noise level V noise Judging the current test amplitude V Hosti Detecting the signal amplitude V testi If the test data is a pair of valid test data, the current test amplitude V is determined Hosti Added as new current test amplitude V Hosti Skipping to execute the step B2); otherwise, skipping to execute the next step;
b3 Draw the obtained n pairs of effective test data into a curve graph by taking the test amplitude and the detection signal amplitude as coordinate axes respectively, and find the test amplitude corresponding to the top of the linear region in the curve as a linearity peak point V e As shown in fig. 5; in this embodiment, all the test amplitudes V are used Hosti (x-axis) detection signal amplitude V testi Drawing a curve chart (for y axis), and according to the change of the curve, dividing the curve into a linear region, a transition region and a saturation region, wherein the linear region is the current test amplitude V Hosti Detecting the signal amplitude V testi The two are in linear proportional relation.
B4 Based on the linearity peak point V e Determining the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed e Detailed description of the method and phases in step A3)At the same time, the electric field intensity value E is measured e And outputting the linear detection value as the detection linearity value of the detected partial discharge intelligent sensing terminal.
In this embodiment, the current test amplitude V is determined in step B2) Hosti Detecting the signal amplitude V testi Judging whether the current test amplitude V is the pair of effective test data Hosti Detecting the signal amplitude V testi The conditions for a valid test data pair are:
V testi >2×V noise
in the above formula, V testi For the current detected signal amplitude, V noise And the noise level of the measured partial discharge intelligent sensing terminal is obtained.
In this embodiment, in step B2), before the skipping performs step B2), determining a current detection signal amplitude V testi Last detection signal amplitude V testi-1 Whether the change rate is smaller than a preset threshold value or not (the change rate can be set according to needs, for example, the value in the embodiment is 5%), and the step B2 is executed only when the change rate is not smaller than the preset threshold value, otherwise, the next step is executed by skipping.
The stability evaluation of the partial discharge intelligent sensing terminal is used for detecting the consistency and stability of monitoring values of the intelligent detection terminal under long-term operation. Because the intelligent sensors face unattended long-term operation, the stability of monitoring data under the maintenance-free condition must be ensured. Therefore, the present embodiment further includes a step of data stability testing: the method comprises the steps that a tested partial discharge intelligent sensing terminal is adjusted to a normal working mode and continuously runs for a specified time (which can be specified according to needs, for example, the time is set to 2 hours in the embodiment), a test value of background noise of the tested partial discharge intelligent sensing terminal is called at regular time according to a specified protocol in the specified time, and the test value of the background noise is an electric field measurement value near a sensor in a state that a signal source is closed; grouping all the test data in the specified duration according to the time length, then calculating the average value mu and the standard deviation sigma among all the groups of data, referring to fig. 6, if the ratio of the electric field measurement value within mu +/-3 sigma exceeds a preset threshold (which can be set as required, in this embodiment, the preset threshold is 95%), then determining that the tested partial discharge intelligent sensing terminal passes the stability evaluation, otherwise, determining that the tested partial discharge intelligent sensing terminal does not pass the stability evaluation.
The reliability evaluation of the partial discharge intelligent sensing terminal is used for detecting the reliability performance of the intelligent detection terminal in the operation under the complex natural environment. Since smart sensors typically operate directly exposed to the natural environment of the surface of the electrical device, this performance assessment is also practical and necessary for smart sensors. Therefore, the present embodiment further includes a step of testing data reliability: respectively adjusting the tested partial discharge intelligent sensing terminal to a normal working mode, carrying out temperature and humidity environment testing and EMC response testing, and respectively calling a testing numerical value of background noise of the tested partial discharge intelligent sensing terminal in the temperature and humidity environment testing and the EMC response testing, wherein the testing numerical value of the background noise is an electric field measurement numerical value near a sensor in a state of closing a signal source output; grouping all the test data in the specified time length according to the time length, then solving the average value among all the groups of data, judging that the tested partial discharge intelligent sensing terminal does not pass the data reliability test if the error between any electric field measurement value under the temperature and humidity environment test and the average value of the corresponding group exceeds a preset threshold value or the error between any electric field measurement value under the EMC response test and the average value of the corresponding group exceeds the preset threshold value, otherwise judging that the tested partial discharge intelligent sensing terminal passes the data reliability test. In this embodiment, when the temperature and humidity environment is tested, the tested partial discharge intelligent sensing terminal is adjusted to a normal operating mode, and then is placed in a temperature and humidity box, a certain temperature and humidity value is set, and specifically, the magnitude order and the testing time of the set value can be selected according to the climate classification corresponding to the natural condition intensity of the sensor operating working place, referring to "GB/T4797.1-2005 electrical and electronic product natural environment condition temperature and humidity". In the whole temperature and humidity experiment process, an upper computer remote software calls a test value of background noise of the intelligent terminal regularly according to a specified protocol, all data of the temperature and humidity examination end are calculated together every 10 seconds to obtain an average value, the error between each measured value and the average value is within 10%, and the intelligent terminal is considered to pass reliability evaluation and deny that the intelligent terminal fails. In the embodiment, when the EMC response test is carried out, the tested partial discharge intelligent sensing terminal is adjusted to a normal working mode, a certain EMC pressure application value is set for an EMC experiment in which the intelligent terminal responds, and the specific setting of the value magnitude and the test time can be selected by referring to GB/T-2017 electromagnetic compatibility test and measurement technology of electrical and electronic equipment (devices and systems). In the whole EMC test process, calling a test value of background noise of the intelligent terminal at regular time through upper computer remote software according to a specified protocol, calculating a group of data every 10 seconds and all data after temperature and humidity tests are finished, calculating an average value, and considering that the intelligent terminal passes reliability evaluation and denies that the intelligent terminal does not pass the evaluation, wherein the error between each measured value and the average value is within 10%.
In summary, aiming at the problem that the existing partial discharge intelligent sensing terminal lacks performance evaluation indexes and cannot be evaluated and has unknown performance during operation, the performance evaluation method of the intelligent sensing terminal can realize the test of multiple performance evaluation indexes including sensitivity, and four specific quantifiable performance evaluation indexes are introduced, namely: the system has the advantages that the system has linearity, sensitivity, reliability and stability, establishes a set of all-station public intelligent monitoring and auxiliary control mechanism for the partial discharge intelligent sensing terminal, provides a uniform communication interface, reduces the intervention of personnel, and really realizes intellectualization, automation and wireless; the reliable operation of the intelligent sensor is also guaranteed, and a criterion is provided for the network access detection of the intelligent sensor.
In 4 indexes of sensitivity, linearity, data stability and reliability (environmental suitability and EMC), the sensitivity and linearity of the intelligent sensing terminal are checked aiming at the signal detection capability of the intelligent sensing terminal, and a fixed traceable signal coupling channel needs to be established for testing. Therefore, as shown in fig. 7, this embodiment further provides a performance detection system of a partial discharge intelligent sensing terminal, including an upper computer 1, a program control signal source 2, a coupling device 3, and a protocol conversion device 4, where the upper computer 1 is connected to a control end of the program control signal source 2, an output end of the program control signal source 2 is connected to the coupling device 3, the protocol conversion device 4 includes a connection terminal for connecting to a detected partial discharge intelligent sensing terminal disposed in the coupling device 3, and the protocol conversion device 4 is connected to the upper computer 1, and a microprocessor of the upper computer 1 is programmed or configured to execute the performance detection method of the partial discharge intelligent sensing terminal. The coupling device 3 is a metal frame structure and is used for placing the measured partial discharge intelligent sensing terminal and coupling the output signal of the program control signal source 2 to the measured partial discharge intelligent sensing terminal. The control upper computer 1 controls a signal source to output a specified signal waveform form and amplitude through a built-in software program, a signal is injected into the signal coupling device 3 to form a stable and traceable electric field environment, and the measured partial discharge intelligent sensing terminal is placed above a reserved measuring window. The partial discharge intelligent sensing terminal uploads a specified detection result to the control upper computer 1 through a 61850 protocol, and the upper computer 1 can realize data processing comparison, automatic verification of various functions, result output and the like.
In addition, the embodiment also provides a sensor transmission impedance test for the measured partial discharge intelligent sensing terminal. The wiring diagram of the transmission impedance test of the sensor of the measured partial discharge intelligent sensing terminal is shown in fig. 8. Signal generator U s And outputting voltage with adjustable frequency, and generating a sinusoidal current signal with corresponding frequency and peak-to-peak value between 10mA and 30mA in a test loop. Adjusting the frequency within the range of 3 MHz-30 MHz, and simultaneously measuring the output voltage V of the sensor to be tested (HFCT) under different frequencies f by using an oscilloscope 2 (f) And a resistance R 0 Voltage V across 1 (f) The transmission impedance value at this frequency is obtained by equation (1).
Z(f)＝R 0 (V 2 (f)/V 1 (f))
The symbols in the above formula are defined as follows:
z (f) -the value of the transmission impedance at the frequency f of the input sinusoidal signal;
R 0 -a resistance;
V 2 (f) -inputting the output voltage of the sensor under test at the frequency f of the sinusoidal signal;
V 1 (f) Resistance R at frequency f of input sinusoidal signal 0 The output voltage across.
The test loop should meet the following requirements: (1) The analog signal measurement bandwidth of the oscilloscope is not lower than 100MHz; (2) R 0 Preferably 50 omega +/-0.2% of non-inductive resistor, and voltage V between two ends thereof 1 (f) The measurement of (2) adopts an oscilloscope high-resistance voltage probe (the measurement bandwidth should not be lower than 100 MHz); (3) The output end of the sensor to be tested (HFCT) is provided with a 50 omega load and is connected with an oscilloscope through a 50 coaxial cable with the length of 1 meter.
In addition, this embodiment also provides the detection frequency test to being surveyed partial discharge intelligent perception terminal. The wiring diagram for the test of detecting frequency is shown in fig. 9. Signal generator U s Output a voltage with adjustable frequency, through R 0 (R 0 Preferably 50 Ω + -0.2% non-inductive resistance) produces a sinusoidal current signal in the test loop of a corresponding frequency with a peak-to-peak value of between 5mA and 10 mA. Adjusting the frequency within the range of 0.5 MHz-50 MHz, and measuring the resistance R by an oscilloscope 0 The voltage across the terminals monitors the current and keeps the current constant when adjusting the frequency. The frequency corresponding to the maximum reading (or the maximum amplitude output by the analog signal port) displayed by the detected instrument (including HFCT) is within the frequency range of 3 MHz-30 MHz, and the 6dB bandwidth is not less than 2MHz.
In addition, the present embodiment also provides a computer readable storage medium, in which a computer program programmed or configured to execute the performance detection method of the partial discharge intelligent sensing terminal is stored.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
Claims (7)
1. A performance detection method of a partial discharge intelligent sensing terminal is characterized by comprising the following steps of:
a1 Am ofNoise level V recorded by measured partial discharge intelligent sensing terminal noise Setting an initial test amplitude V Host ；
A2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Host The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V test Based on the noise level V noise Judging whether the tested partial discharge intelligent sensing terminal tests the current test amplitude V Host Measurable, if measured partial discharge intelligent perception terminal to present test amplitude V Host Can be measured, then the current test amplitude V is measured Host Reduced as new current test amplitude V Host Skipping to execute the step A2); otherwise, the last current test amplitude V is used Host Measurable minimum test amplitude V serving as measured partial discharge intelligent sensing terminal s ；
A3 Based on the minimum test amplitude V s Determining the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed s And applying the electric field intensity value E s Outputting the partial discharge detection sensitivity value as a detection sensitivity value of the detected partial discharge intelligent sensing terminal;
the performance detection method also comprises the following steps of testing the linearity:
b1 Record the noise level V of the measured partial discharge intelligent sensing terminal noise Initializing an iteration variable i to 1, and setting an initial test amplitude V Hosti ；
B2 Sending a current test amplitude V to the measured partial discharge intelligent sensing terminal Hosti The standard discharge pulse waveform is communicated with the detected partial discharge intelligent sensing terminal, and the detected partial discharge intelligent sensing terminal is called to upload the current detection signal amplitude V testi Based on noise level V noise Judging the current test amplitude V Hosti And detecting the signal amplitude V testi If the test data is a pair of valid test data, the current test amplitude V is determined Hosti Added as new currentTest amplitude V Hosti (ii) a Judging the current detection signal amplitude V testi Last detection signal amplitude V testi-1 Whether the change rate is smaller than a preset threshold value or not, and skipping to execute the step B2 only when the change rate is not smaller than the preset threshold value; otherwise, skipping to execute the next step; wherein the current test amplitude V is determined Hosti Detecting the signal amplitude V testi The conditions for a valid test data pair are: v testi >2×V noise In which V is testi For the current detected signal amplitude, V noise The noise level of the measured partial discharge intelligent sensing terminal is obtained;
b3 Drawing a curve graph by using the obtained n pairs of effective test data and using the test amplitude and the detection signal amplitude as coordinate axes respectively, and finding the test amplitude corresponding to the peak of the linear area in the curve as a linearity peak point V e ；
B4 Based on the linearity peak point V e Determining electric field intensity value E of placement position of measured partial discharge intelligent sensing terminal e And applying the electric field intensity value E e And outputting the linear detection value as the detection linearity value of the detected partial discharge intelligent sensing terminal.
2. The method for detecting the performance of the intelligent sensing terminal for partial discharge according to claim 1, wherein in the step A2), it is determined whether the intelligent sensing terminal for partial discharge to be detected is in response to the current test amplitude V Host When the intelligent sensing terminal can be measured, the current test amplitude V of the tested partial discharge intelligent sensing terminal is judged Host The measurable conditions are:
V test >2×V noise
in the above formula, V test For the current detected signal amplitude, V noise The noise level of the measured partial discharge intelligent sensing terminal is obtained.
3. The method for detecting the performance of the intelligent sensing terminal for partial discharge according to claim 2, wherein the electric field intensity value E at the position where the intelligent sensing terminal for partial discharge to be detected is placed is determined in the step A2) s Comprises the steps of: placing an intelligent sensor at the opening of the GTEM chamber, and adjusting the amplitude of the output voltage of the calibration source to be the minimum test amplitude V s Obtaining the minimum test amplitude V of the output voltage amplitude of the calibration source of the intelligent sensor s Voltage response of time V Mr Then according to E s =V Mr /H ref Calculating to obtain the electric field intensity value E of the place where the measured partial discharge intelligent sensing terminal is placed s In which H ref Is the effective height of the intelligent sensor.
4. The performance detection method of the intelligent sensing terminal for partial discharge according to claim 1, further comprising a data stability test step: the method comprises the steps that a tested partial discharge intelligent sensing terminal is adjusted to a normal working mode and continuously runs for a specified duration, a test value of background noise of the tested partial discharge intelligent sensing terminal is called regularly according to a specified protocol in the specified duration, and the test value of the background noise is an electric field measurement value near a sensor in a state that a signal source is closed; grouping all the test data in the specified duration according to the time length, then solving the average value mu and the standard deviation sigma between each group of data, if the ratio of the electric field measurement value within mu +/-3 sigma exceeds a preset threshold value, judging that the tested partial discharge intelligent sensing terminal passes the stability evaluation, otherwise, judging that the tested partial discharge intelligent sensing terminal does not pass the stability evaluation.
5. The performance detection method of the partial discharge intelligent sensing terminal according to claim 4, further comprising a data reliability test step: respectively adjusting the tested partial discharge intelligent sensing terminal to a normal working mode, carrying out temperature and humidity environment testing and EMC response testing, and respectively calling a testing value of background noise of the tested partial discharge intelligent sensing terminal in the temperature and humidity environment testing and the EMC response testing, wherein the testing value of the background noise is an electric field measurement value near a sensor in a state of turning off a signal source output; grouping all the test data in the specified time length according to the time length, then solving the average value among all the groups of data, judging that the tested partial discharge intelligent sensing terminal does not pass the data reliability test if the error between any electric field measurement value under the temperature and humidity environment test and the average value of the corresponding group exceeds a preset threshold value or the error between any electric field measurement value under the EMC response test and the average value of the corresponding group exceeds a preset threshold value, and otherwise, judging that the tested partial discharge intelligent sensing terminal passes the data reliability test.
6. A performance detection system of a partial discharge intelligent sensing terminal is characterized by comprising an upper computer, a program control signal source, a coupling device and a protocol conversion device, wherein the upper computer is connected with a control end of the program control signal source, an output end of the program control signal source is connected with the coupling device, the protocol conversion device comprises a connecting terminal used for being connected with a tested partial discharge intelligent sensing terminal arranged in the coupling device, the protocol conversion device is connected with the upper computer, and a microprocessor of the upper computer is configured to execute the performance detection method of the partial discharge intelligent sensing terminal according to any one of claims 1-5.
7. A computer-readable storage medium, wherein a computer program configured to execute the performance detection method of the partial discharge intelligent sensing terminal according to any one of claims 1 to 5 is stored in the computer-readable storage medium.
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| US6242900B1 (en) * | 1998-06-10 | 2001-06-05 | Hubble Incorporated | System for measuring partial discharge using digital peak detection |
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| CN105223530B (en) * | 2015-10-20 | 2017-03-22 | 国家电网公司 | High-frequency partial discharge detector calibration system and calibration method thereof |
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