CN114487741A - Electrical equipment live detection method and system - Google Patents
Electrical equipment live detection method and system Download PDFInfo
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- CN114487741A CN114487741A CN202210345716.XA CN202210345716A CN114487741A CN 114487741 A CN114487741 A CN 114487741A CN 202210345716 A CN202210345716 A CN 202210345716A CN 114487741 A CN114487741 A CN 114487741A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The invention belongs to the technical field of power grid partial discharge detection, and particularly relates to an electrified detection method and system for electrical equipment. The system comprises a sensor, a signal preprocessing unit and a microprocessor unit. The signal preprocessing unit comprises an amplifying circuit module and a rectifying circuit module, and the microprocessor unit comprises a control module, a power supply module and an RS485 communication module. The sensors are arranged on the two sides inside and outside the shell of the electric equipment related to the power distribution network, detect the discharge signal and transmit the signal to the amplifying circuit module. The amplifying circuit module amplifies the voltage signal output by the sensor. The rectification circuit module adopts full-wave rectification. The control module employs STM32F103VCT 6. The power supply module provides 3.3V and 5V direct current voltage. The RS485 communication module provides a channel for communication between the microprocessor and the upper computer, and can accurately judge the health state of the equipment to be tested based on the partial discharge signal, so that the safety and the reliability of the operation of the power distribution network are improved.
Description
Technical Field
The invention belongs to the technical field of power grid partial discharge detection, and particularly relates to an electrified detection method and system for electrical equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the increasing expansion of power distribution networks and the increasing use of more and more electrical equipment, power maintainers are required to regularly and timely detect the operating conditions and health states of the power distribution networks and the electrical equipment. In daily maintenance and repair work, electrical equipment in a working environment is often subjected to various influences, and normal operation of the equipment is sometimes interfered to cause equipment failure, so that uncertainty of operation of a power grid is increased.
At present, most of electrical equipment still adopts an online monitoring technology for live detection, but the defects and shortcomings of the electrical equipment are not ignored, such as electronic monitoring of data distortion, a discontinuous and stable transmission channel, a data analysis system with a low intelligence degree and the like, the online monitoring system is large in construction scale, a large number of monitoring equipment and a large data volume, so that the data is difficult to accurately extract, the extracted data is easy to distort and even lose and other serious consequences under the condition of various electromagnetic interferences on an equipment site with a severe environment, the data cannot contain accurate equipment operation information when distorted, and the wrong diagnosis conclusion obtained on the equipment state is extremely unfavorable for maintaining the operation of a power grid.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a method and a system for detecting electrification of electrical equipment. Under the condition of no power outage, various operating parameters and state quantities of electrical equipment which is using electricity can be presented to maintainers, data of abnormal state quantities, fault positions and fault severity of the equipment are subjected to qualitative and quantitative analysis, the health state of the equipment to be tested can be accurately judged and accurately analyzed, and the safety and reliability of operation of the power distribution network are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a method for detecting electrification of an electrical device, including:
and searching for abnormal signals aiming at related electrical equipment in the power distribution network, judging the abnormal signals and judging whether the abnormal signals are interference signals. If yes, the detection is directly finished, and the interference signal cannot be used as useful information for discharge detection; if not, judging the signal source by adopting a time-lead method.
Further, the sources of interference signals for the associated electrical devices in the power distribution network may be divided into internal and external. Accurately positioning an external discharge source by adopting a bisection surface method (also called a triangular method); and aiming at the internal discharge source, a time difference positioning method and an acoustoelectric combination method are adopted for accurate positioning.
Furthermore, after the internal discharge source is accurately positioned, the signals conforming to the characteristic map are determined through the PRPS/PRPD characteristic map, so that the type of the discharge signals is detected, then the detection data is analyzed, processed and stored, and the damage severity of the related electrical equipment is judged.
A second aspect of the present invention provides an electrical equipment live detection system, comprising:
signal preprocessing module and microprocessor module. A signal pre-processing module configured to: preprocessing the output signal of the sensor through a signal preprocessing circuit so as to obtain an available signal containing complete discharge information; a microprocessor module configured to: and the signal receiving, data processing and data sending are completed aiming at the available signals output by the signal preprocessing circuit.
Further, the signal preprocessing module comprises an amplifying circuit and a rectifying circuit. The microprocessor module comprises a control module, a power supply module and an RS485 communication module.
Furthermore, the amplification circuit plays a role in amplifying weak voltage signals output by the sensor, an LTC6269 chip with high precision and low power consumption is used as the core of the amplification circuit, the LTC6269 is a dual-channel 4GHzFET input operational amplifier, the LTC6269 has extremely low input bias current and low input capacitance, the current noise and the voltage noise of the LTC6269 converted to the input end are low, and the amplifier can be kept stable without compensation under the condition of 10-time gain;
furthermore, the design of the rectifier circuit is convenient for the acquisition of analog quantity by the ADC module of the microprocessor, a 10-bit analog-to-digital conversion chip AD9601 is adopted for acquiring analog signals, two groups of operational amplifiers are contained, and the chip is connected with the embedded processor through the SPI interface;
furthermore, the control module adopts an STM32F103VCT6 chip as a processor to complete signal receiving, data processing and data sending;
furthermore, three voltage stabilizing circuits are designed in the power supply module, wherein the power supply circuit for supplying power to the chip is designed by adopting LM2596 and TPS7333, and a TL431 chip is used as a core to design a 3.3V voltage circuit with better voltage stabilizing effect to be supplied to the ADC module so as to reduce the error caused by inaccurate reference voltage of the ADC module;
furthermore, the RS485 communication module adopts an SP3485 chip for communication between the microprocessor and the upper computer, and the transmission signal adopts a transmission line two-wire (A \ B) differential mode.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an electrified detection method and system for electrical equipment, which are used for preprocessing signals by utilizing related information transmitted by a sensor to obtain available signals of complete discharge information, and receiving, analyzing and storing the available information through an ADC (analog to digital converter) interface of a microprocessor module. The invention carries out live detection on the insulation discharge of the power distribution network and the related electrical equipment thereof, ensures that the electrical equipment can accurately judge and accurately analyze the health state of the equipment to be detected while carrying out detection without power outage, can reduce the fault occurrence rate of the power distribution network and the related electrical equipment thereof to the minimum, and improves the safety and reliability of the operation of the power distribution network.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of partial discharge detection according to a first embodiment of the present invention;
FIG. 2 is a hardware layout diagram of an amplifying circuit according to a second embodiment of the present invention;
FIG. 3 is a hardware wiring diagram of a rectifier circuit according to a second embodiment of the present invention;
FIG. 4 is a hardware layout diagram of a control circuit according to a second embodiment of the present invention;
FIG. 5 is a hardware wiring diagram of a power circuit according to a second embodiment of the present invention;
fig. 6 is a hardware design diagram of an RS485 communication circuit according to a second embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
The embodiment provides a method for detecting electrification of electrical equipment, which specifically includes the following steps as shown in fig. 1:
And 2, judging interference signals. And judging whether the abnormal signal is an interference signal or not by aiming at the abnormal signal. If yes, the detection is directly finished, and the interference signal cannot be used as useful information for discharge detection; if not, judging the signal again by adopting the step 3.
And step 3, judging the signal source. And aiming at non-interference signals, judging the signal source by adopting a time-lead method. The interference signal source can be divided into the internal and external of the electric equipment related to the power distribution network.
And 4, positioning the discharge source. Accurately positioning an external discharge source by adopting a bisection surface method (also called a triangular method); and aiming at the internal discharge source, a time difference positioning method and an acoustoelectric combination method are adopted for accurate positioning.
And 5, judging the discharge type. After the internal discharge source is accurately positioned, the type of the discharge signal is effectively determined and detected and judged through the PRPS/PRPD characteristic map.
And 6, judging the severity. And after the discharge type is judged, analyzing, processing and storing the detection data, and judging the damage severity of the related electrical equipment.
According to the invention, whether the abnormal signal belongs to the interference signal or not is judged by searching the abnormal signal, the source judgment is carried out again aiming at the non-interference signal, and the source is divided into the inside and the outside of the electric equipment of the power distribution network. For an internal discharge source, firstly, a time difference positioning method and an acoustoelectric combination method are adopted to position the position of the discharge source, and then the discharge type and the discharge severity are judged on the basis. The electrified detection can lead various operation parameters and state quantities of the electrical equipment which is using electricity to be presented to the maintainers without power failure, gives data of abnormal state quantity, fault position and fault severity of the equipment for qualitative and quantitative analysis, and is very convenient for measuring the operation of the equipment. The detection mode does not bring any influence and interference to the environment around the site needing to be detected, has the advantages of low cost and investment, high detection speed and the like, and is suitable for most management and operation modes of power production in China at present. Meanwhile, a lot of power equipment cannot allow power failure detection in a live-line operation state, potential safety hazards of the equipment are not easy to find, and under the condition of no power failure, live-line detection can still make accurate judgment and accurate analysis on the health state of equipment to be detected, so that the safety and reliability of operation of the power distribution network are improved.
Example two
The embodiment provides an electrified detecting system of electrical equipment, which specifically comprises the following modules:
signal preprocessing module and microprocessor module. A signal pre-processing module configured to: preprocessing the output signal of the sensor through a signal preprocessing circuit so as to obtain an available signal containing complete discharge information; a microprocessor module configured to: and the signal receiving, data processing and data sending are completed aiming at the available signals output by the signal preprocessing circuit.
The signal preprocessing module comprises an amplifying circuit and a rectifying circuit. The microprocessor module comprises a control module, a power supply module and an RS485 communication module.
The amplification circuit plays an amplification role aiming at a weak voltage signal output by the sensor, an LTC6269 chip with high precision and low power consumption is used as the core of the amplification circuit, the LTC6269 is a dual-channel 4GHzFET input operational amplifier, the LTC6269 has extremely low input bias current and low input capacitance, the current noise and the voltage noise of the LTC6269, which are converted to an input end, are also very low, and the amplifier can be kept stable without compensation under the condition of 10 times of gain;
the design of the rectifier circuit is convenient for the analog quantity acquisition of the microprocessor ADC module, the acquisition of analog signals is carried out by adopting a 10-bit analog-to-digital conversion chip AD9601, two groups of operational amplifiers are contained, and the chip is connected with the embedded processor through an SPI interface;
the control module adopts an STM32F103VCT6 chip as a processor to complete signal receiving, data processing and data sending;
the power supply module is provided with three voltage stabilizing circuits in total, wherein a power supply circuit for supplying power to the chip is designed by adopting LM2596 and TPS7333, and a TL431 chip is used as a core to design a 3.3V voltage circuit with better voltage stabilizing effect so as to supply the voltage stabilizing circuit to the ADC module, so that the error caused by inaccurate ADC reference voltage is reduced;
the RS485 communication module adopts an SP3485 chip and is used for communication between the microprocessor and the upper computer, and signals transmitted by the RS485 communication module adopt a transmission line two-wire (A \ B) differential mode.
The system mainly comprises a signal preprocessing module and a microprocessor module, and the signals output by the sensor are collected, analyzed and stored by utilizing the preprocessing module and the microprocessor module. Because the output signal of the sensor still contains the negative pressure signal after the amplification of the amplifying circuit, and the ADC of the processor generally only can effectively collect the positive voltage signal, and a plurality of noise waves and interferences are mixed in the useful signal and output to the next link by the sensor, the noise waves are not the information that we want, and even interfere the judgment of our discharge condition, and the accuracy of partial discharge detection can be improved by filtering the noise waves. Therefore, the system provided by the invention combines the signal preprocessing module and the microprocessor module, filters and arranges the disordered information output by the sensor, finally obtains the required correct information, presents the correct information to the staff and provides information support for the staff to detect the insulation discharge of the electrical equipment of the power distribution network. The equipment insulation fault is discovered in advance, the fault occurrence rate of the power distribution network and the related electrical equipment is reduced to the minimum, and the operation safety and reliability of the power distribution network are improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An electrical equipment live detection method is characterized by comprising the following steps:
whether the abnormal signal belongs to the interference signal or not is judged by searching the abnormal signal, the source judgment is carried out again aiming at the non-interference signal, the source of the abnormal signal is divided into the inside and the outside of the electric equipment of the power distribution network, the position of the discharge source is firstly positioned by adopting a time difference positioning method and an acoustoelectric coupling method aiming at an internal discharge source, and then the discharge type and the discharge severity are judged on the basis.
2. The live detection method for the electrical equipment according to claim 1, further comprising: searching abnormal signals aiming at related electrical equipment in the power distribution network, judging the abnormal signals, and judging whether the abnormal signals are interference signals: if yes, the detection is directly finished, and the interference signal cannot be used as useful information for discharge detection; if not, judging the signal source by adopting a time-lead method.
3. The live detection method for the electrical equipment according to claim 1, further comprising: the interference signal source aiming at related electrical equipment in the power distribution network can be divided into an internal part and an external part, and the external discharge source is accurately positioned by adopting a bisection surface method; and aiming at the internal discharge source, a time difference positioning method and an acoustoelectric combination method are adopted for accurate positioning.
4. The live detection method for the electrical equipment according to claim 1, further comprising: after the internal discharge source is accurately positioned, signals conforming to the characteristic map are determined through the PRPS/PRPD characteristic map, so that the type of the discharge signals is detected, then the detection data is analyzed, processed and stored, and the damage severity of the related electrical equipment is judged.
5. An electrical equipment live detection system using the electrical equipment live detection method according to any one of claims 1 to 4, characterized by comprising: the device comprises a signal preprocessing module and a microprocessor module;
the signal preprocessing module is used for preprocessing the output signal of the sensor through a signal preprocessing circuit so as to obtain an available signal containing complete discharge information, specifically, judging whether the abnormal signal belongs to an interference signal or not by searching the abnormal signal, judging the source of the non-interference signal again, and dividing the source of the non-interference signal into the inside and the outside of the electrical equipment of the power distribution network;
the microprocessor module receives signals and processes and sends data according to available signals output by the signal preprocessing circuit, wherein the data processing specifically comprises the steps of positioning the position of a discharge source by adopting a time difference positioning method and an acoustoelectric joint method according to an internal discharge source, and judging the discharge type and the discharge severity on the basis.
6. The live detection system for the electrical equipment as claimed in claim 5, wherein the signal preprocessing module comprises an amplifying circuit and a rectifying circuit, the amplifying circuit plays an amplifying role in the voltage signal output by the sensor, an LTC6269 chip is used as the core of the circuit, and the LTC6269 is a two-channel 4GHzFET input operational amplifier; the rectification circuit adopts a 10-bit analog-to-digital conversion chip AD9601 to collect analog signals, two groups of operational amplifiers are contained in the rectification circuit, and the chip is connected with the embedded processor through an SPI interface.
7. The live detection system for the electrical equipment as claimed in claim 5, wherein the microprocessor module comprises a control module, a power supply module and an RS485 communication module, wherein the control module adopts an STM32F103VCT6 chip as a processor to complete the receiving of signals, the processing and the sending of data; the power supply module is provided with three voltage stabilizing circuits in total, wherein a power supply circuit for supplying power to the chip is designed by adopting LM2596 and TPS7333, and a 3.3V voltage stabilizing circuit is designed on the basis of the TL431 chip to supply the voltage stabilizing circuit to the ADC module so as to reduce errors caused by inaccurate reference voltage of the ADC; the RS485 communication module adopts an SP3485 chip and is used for communication between the microprocessor and the upper computer, and signals transmitted by the RS485 communication module adopt a transmission line two-wire differential mode.
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| CN202210345716.XA CN114487741A (en) | 2022-04-02 | 2022-04-02 | Electrical equipment live detection method and system |
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| CN202210345716.XA CN114487741A (en) | 2022-04-02 | 2022-04-02 | Electrical equipment live detection method and system |
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| CN102841294A (en) * | 2011-12-23 | 2012-12-26 | 湖北省电力公司电力科学研究院 | Method for identifying signal and interference signal in ultrahigh frequency partial discharge detection in electrical equipment |
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2022
- 2022-04-02 CN CN202210345716.XA patent/CN114487741A/en not_active Withdrawn
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| CN102841294A (en) * | 2011-12-23 | 2012-12-26 | 湖北省电力公司电力科学研究院 | Method for identifying signal and interference signal in ultrahigh frequency partial discharge detection in electrical equipment |
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