CN104698354A - GIL (globalization, internationalization and localization) breakdown discharge positioning detecting system - Google Patents
GIL (globalization, internationalization and localization) breakdown discharge positioning detecting system Download PDFInfo
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- CN104698354A CN104698354A CN201510111527.6A CN201510111527A CN104698354A CN 104698354 A CN104698354 A CN 104698354A CN 201510111527 A CN201510111527 A CN 201510111527A CN 104698354 A CN104698354 A CN 104698354A
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Abstract
The invention discloses a GIL (globalization, internationalization and localization) breakdown discharge positioning detecting system. A plurality of vibration detecting devices are adhered to GIL equipment at intervals of 10-20 meters, and if the outputting voltage of the vibration detecting devices is higher than a certain threshold value, the locations of the vibration detecting devices or positions close to the vibration detecting devices have breakdown discharge; and when the breakdown discharge is caused, the intensities of vibration signals acquired from the same GIL equipment are compared, and the distance from the location of the vibration detecting device which acquires the signals with the maximum intensity to the position of breakdown discharge is minimum. Advantages of the vibration signals are utilized sufficiently, by an advanced vibration signal analyzing method, the position and the intensity of breakdown discharge of the GIL equipment can be determined accurately, the overhaul efficiency of the GIL equipment is greatly improved, the service life of the GIL equipment is prolonged, the working reliability of the GIL equipment is improved, and the safety and the reliability on stable running of an electric system are guaranteed.
Description
Technical field
The present invention relates to gas-insulated metal closed power transmission line in electric system (GIL) breakdown discharge examination and positioning field, particularly a kind of GIL breakdown breakdown location detection system.
Background technology
Gas-insulated metal closed power transmission line (GIL) is the transmission equipment of electric energy in transformer station.In recent years, the use amounts of advantage in power station such as GIL is large with its transmission capacity, stable performance, reliability is high, space hold is little increase gradually, and every bar circuit is from tens of rice to the even thousands of rice of hundreds of rice.Short duration power frequency withstand voltage test is carried out before putting into operation after standard-required GIL installation, to check the installation quality of product, reliability service after guarantee puts into operation.For longer GIL circuit, once the carelessness that works in installation process causes, and breakdown electric discharge occurs in power frequency withstand test process in short-term, because circuit is longer, be difficult to determine the accurate location occurred that discharges, give maintenance or change and bring very large difficulty.Therefore carry out detection & localization to the breakdown electric discharge of GIL equipment, for the circuit sections judging to overhaul, thus it is significant to improve overhaul efficiency.
At present, the domestic detection and positioning not yet having unit or research institution to discharge for GIL equipment breakdown is studied.
Summary of the invention
For above-mentioned subproblem, the invention provides a kind of GIL equipment breakdown breakdown location detection system.
A kind of GIL breakdown breakdown location detection system, described system installs several vibration detection devices by attaching every 10 ~ 20 meters on GIL equipment, if the output voltage of described vibration detection device is higher than certain threshold value, then think this vibration detection device place position or neighbouringly there is breakdown electric discharge; When there is breakdown electric discharge, by contrasting the vibration signal intensity captured from same GIL equipment, then can think that the position of the vibration signal pick-up unit position distance generation breakdown electric discharge collecting strongest signal strength is nearest;
Described vibration detection device comprises sensor, the vibration signal of reception is converted to voltage signal and exports by described sensor, and carry out signal condition by low-pass filter circuit unit, subtraction circuit unit, amplifier circuit unit, and by radio-frequency module, voltage signal is exported successively;
Described low-pass filter circuit unit is for realizing the high-frequency interferencing signal in filtering vibration signal;
Described subtraction circuit unit removes sensor output signal DC biased level for realizing;
Described amplifier circuit unit is used for realizing amplifying vibration signal;
Described radio frequency unit is used for, in substation, vibration signal data are carried out wireless transmission and reception;
Described threshold value sets according to site test after having disposed described vibration detection device.
The present invention makes full use of the advantage of vibration signal, in conjunction with advanced divided oscillation signal analysis method, accurately can judge the position that the electric discharge of GIL equipment breakdown occurs and intensity, increase substantially the overhaul efficiency of GIL equipment, and then improving its mission life and functional reliability, the stable operation for electric system provides safe and reliable guarantee.
Accompanying drawing explanation
GIL breakdown breakdown location detection system overall construction drawing in Fig. 1 the present invention;
Vibration detecting unit theory diagram in Fig. 2 the present invention;
Intelligent slave computer theory diagram in Fig. 3 the present invention.
Embodiment
In a basic embodiment, the invention provides a kind of GIL breakdown breakdown location detection system, described system installs several vibration detection devices by attaching every 10 ~ 20 meters on GIL equipment, if the output voltage of described vibration detection device is higher than certain threshold value, then think this vibration detection device place position or neighbouringly there is breakdown electric discharge; When there is breakdown electric discharge, by contrasting the vibration signal intensity captured from same GIL equipment, then can think that the position of the vibration signal pick-up unit position distance generation breakdown electric discharge collecting strongest signal strength is nearest;
Described vibration detection device comprises sensor, the vibration signal of reception is converted to voltage signal and exports by described sensor, and carry out signal condition by low-pass filter circuit unit, subtraction circuit unit, amplifier circuit unit, and by radio-frequency module, voltage signal is exported successively;
Described low-pass filter circuit unit is for realizing the high-frequency interferencing signal in filtering vibration signal;
Described subtraction circuit unit removes sensor output signal DC biased level for realizing;
Described amplifier circuit unit is used for realizing amplifying vibration signal;
Described radio frequency unit is used for, in substation, vibration signal data are carried out wireless transmission and reception;
Described threshold value sets according to site test after having disposed described vibration detection device.
Due to GIL equipment generation breakdown discharge time, shock wave can be produced, described shock wave energy makes the housing generation vibration to a certain degree of GIL equipment, and the vibration signal therefore by detecting GIL apparatus casing surface can reflect the position that breakdown electric discharge occurs and intensity accordingly.And when there is breakdown electric discharge, by the intensity of vibration signal gathered, find the vibration detection device collecting most strong vibration signal, then the position that occurs of the positional distance breakdown electric discharge at this vibration detection device place is nearest; When appearance two vibration detection devices all detect the strongest vibration signal, then think that the centre of those two vibration detection devices is the position that breakdown electric discharge occurs.The size of the voltage that the intensity of vibration signal mentioned here can be exported by sensor judges also to be judged by the energy calculating vibration signal, or other modes.
Preferably, described system is applicable to the detection & localization of the breakdown electric discharge of the GIL equipment of 550kV grade and following grade.Can be learnt by analysis of experiments, when detecting electric pressure at 550kV, the vibration signal frequency that the electric discharge of GIL equipment breakdown produces, greatly about about 10kHz, therefore requires that the responding range of the sensor in described vibration detection device can not lower than 15kHz.Sensor for detecting vibration signal has multiple, such as displacement transducer, speed pickup, acceleration transducer, force snesor, strain transducer etc.Consider the frequency range of surveyed vibration signal, general acceleration transducer there is good frequency response, the therefore the most frequently used piezoelectric acceleration transducer of preferred frequency band wider range.Piezoelectric acceleration sensor is divided into electric charge output type and voltage output type two kinds, because voltage output type piezoelectric acceleration sensor is integrated with charge amplifier therein, can effectively simplify signal condition external circuit, facilitate the Miniaturization Design of pick-up unit, preferably, ACH-01 voltage output type piezoelectric accelerometer is selected.But in reality, the selection of sensor is little with type, concrete kind relation, as long as selected sensor exports as voltage signal, and its sensitivity is the same with ACH-01 or higher with frequency range, just can directly apply.
What the present invention adopted is distributed sensor system, namely according to the length of GIL circuit sections, equably in the full section placement sensor of GIL circuit, effectively can cover GIL circuit omnidistance, improve reliability and the sensitivity of this covering device.
Preferably, described vibration detection device carries out attaching along GIL case surface every 10-20m and installs, and to realize accurate location, the vibration signal of breakdown electric discharge moment occurs for catching GIL.Each sensor can detect a vibration signal, determines concrete discharge position by contrasting all signal intensities, if interval is excessive, is then inconvenient to investigate.
In order to make the signal that collects easy to use, the vibration signal collected is carried out signal condition by low-pass filter circuit unit, subtraction circuit unit, amplifier circuit unit, and exported by voltage signal by radio-frequency module successively.By using wireless mode to be exported by voltage signal, be installed on easy and simple to handle, testing process is safer.Wherein, the amplifier adjustable magnification of amplifier circuit unit, makes the use of vibration detection device possess larger sensitivity and dirigibility.And use radio-frequency module to carry out radio communication, can avoid using telecommunication cable to bring to the original line construction of transformer station changes and impact, can keep the original layout of transformer station to greatest extent.
In one embodiment, intelligent slave computer is used to monitor vibration detection device.
Preferably, described intelligent slave computer receives the data of described vibration detection device, uses microprocessor to calculate by short-time energy method the vibration signal energy that each vibration detection device gathers.
Optionally, described intelligent slave computer is by communicating between zigbee agreement with described vibration detection device.Due to the restriction of the communication distance of zigbee agreement, be the position of accurately location breakdown electric discharge, each intelligent slave computer can only supervise at most 8 vibration detection devices simultaneously.And in plurality of wireless networks communication mode, select zigbee agreement, be because zigbee agreement has the feature of high reliability, low cost, low-power consumption, high security, be very suitable for the application scenario needing lower data amount, low rate, low power loss communication.But other communication protocol also can be used between vibration detection device and intelligent slave computer to carry out information transmission.
In another embodiment, described system also comprises host computer, and described host computer uses the threshold value of vibration detection device described in software design patterns, when the vibration signal that described vibration detection device detects is more than or equal to described threshold value, and described software startup writing function; Otherwise it is invalid the data of reception to be considered as.
The use of described host computer, makes the monitoring of discharging to the breakdown of GIL equipment convenient and simple, to increase or the minimizing of monitored object, only needs the quantity increasing or reduce intelligent slave computer.
On host computer, conveniently just can find out which vibration detection device detects breakdown electric discharge, preferably, the vibration signal energy of the same GIL equipment that described host computer is transmitted by the intelligent slave computer of contrast, judge the vibration detection device of most strong vibration energy, and then described vibration detection device is positioned and marked.In the system, the prior typing relevant information of all vibration detection devices, thus when the vibration detection device judging most strong vibration energy, described system will provide specifying information and the positional information of corresponding vibration detection device, and if the vibration detection device of multiple most strong vibration energy detected, then together can mark, and then facilitate monitor staff effectively to fix a breakdown.
In order to avoid the long distance electromagnetic interference (EMI) of Control Room and substation field, ensure the validity of image data, preferably, described intelligent slave computer uses CAN to carry out signal output, the signal exported is converted to after light signal through optical fiber modulation module and uses optical fiber to carry out Signal transmissions, become to meet the electric signal of CAN agreement at host computer through optical fibre interrogation module converts again, so just can be turned the relevant interfaces such as CAN by usb be connected directly between in the USB of PC or industrial computer, then host computer monitoring software will read data by USB port, and then in host computer, complete some Processing tasks.
Preferably, when described upper computer detection is discharged to breakdown, then report to the police.The form of described warning can be the form such as hummer, LED.
Preferably, vibration signal shows with the form of waveform by described host computer.
Optionally, for later to the research of historical data, can carry out storing to the data of record and derive in described host computer side.
Below in conjunction with accompanying drawing, GIL breakdown breakdown location detection system of the present invention is described in further detail.
As shown in Figure 1, this is GIL breakdown breakdown location detection system overall construction drawing, involving vibrations pick-up unit, intelligent slave computer and host computer.Described vibration detection device distributing installation is in each air chamber case surface of GIL, to discharge the GIL case vibration signal caused for obtaining breakdown, and carry out conditioning and the collection of vibration signal, then use zigbee agreement to be sent to corresponding intelligent slave computer by radio-frequency module, described radio-frequency module is CC2530 radio-frequency module.Described intelligent slave computer, for line algorithm process of the vibration signal received data importing being gone forward side by side.In the machine of described intelligent position, adopt arm processor to be acp chip, radio-frequency module is launched the vibration signal come the calculates corresponding vibration signal energy of vibration signal in short-term by short-time energy method, then the vibration signal of result of calculation and reception is uploaded to host computer by optical fiber.Described host computer uses the threshold value of vibration detection device described in software design patterns, in one embodiment according to the amplifying circuit of reality, described threshold value is set to 1.8V, then when the vibration signal detected when described vibration detection device is more than or equal to 1.8V, and described software startup writing function; Otherwise it is invalid the data of reception to be considered as.Described software utilizes the valid data of record, to detecting that the vibration detection device of most strong vibration signal positions and marks.In described software detection to breakdown electric discharge, while namely starting to record valid data, host computer provides warning, and shows with the form of waveform the vibration signal detected.Described host computer can store the data of record, facilitates the later stage to derivation of historical data etc.
In fig. 2, a detailed vibration detection device theory diagram is provided.Described device not only comprises signal conditioning circuit, also comprises a battery and electric power management circuit.The signal that vibration transducer exports is a voltage signal.This voltage signal is first by a second order active low-pass filter, and the cutoff frequency of this wave filter is 10kHz, can filtering in the undesired signal of more than 10kHz.Because sensor output signal exists the direct current biasing of a non-zero, therefore the output signal of low-pass filter is sent into subtraction circuit.The output signal of subtracter by signal amplifier circuit, by changing the control that the resistance size of feedback resistance realizes output voltage, the voltage range making it meet single-chip microcomputer can to sample.
Provide a detailed intelligent slave computer theory diagram in figure 3.In figure 3, described intelligent slave computer is made up of master control borad, motherboard and power panel.Master control borad chooses STM32F407ZE as core processor, the vibration signal received by less radio-frequency receiving trap imports chip into by serial ports and carries out the process of short-time energy method, vibration signal raw data reaches host computer monitoring software with the signal analysis result after algorithm process by CAN, consider that intelligent slave computer distance detection room also exists the electromagnetic interference (EMI) of long distance, so utilize optical fiber modulation module that CAN voltage signal is changed into light signal.Power panel provides voltage source for lower computer system, and by 220V AC power input switch power supply after power-supply filter, output system operating voltage is powered to master control borad after motherboard package switching.
In sum, GIL breakdown breakdown location detection system of the present invention has the following advantages:
(1) discharge position can be judged easily by analyzing vibration signal;
(2) do not relate to high-low pressure potential isolation, antijamming capability is strong;
(3) Signal transmissions adopts the solution based on zigbee wireless protocols, installs with easy and simple to handle;
(4) intelligent slave computer is calculated the signal energy of the vibration nodal point of administrative area thus judges the vibration severe degree of administrative area by short-time energy method;
(5) the long distance electromagnetic interference (EMI) of Control Room and substation field can be avoided by Optical Fiber Transmission scheme, ensure the validity of image data;
(6) host computer monitoring software receives the Preliminary Analysis Results of whole intelligent slave computer, can to the detection of the breakdown electric discharge of the whole piece GIL equipment of 550kV grade and following grade with locate fast and accurately, and energy storing history data, fault diagnosis work is launched further;
(7) monitoring flexibly, only needs the quantity increasing or reduce vibration detection device and intelligent slave computer as required.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what stress is all the difference with other embodiments, between each embodiment identical similar part mutually see.
Above a kind of GIL breakdown breakdown location detection system provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands system of the present invention and core concept thereof for helping; Meanwhile, for those skilled in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a GIL breakdown breakdown location detection system, it is characterized in that, described system installs several vibration detection devices by attaching every 10 ~ 20 meters on GIL equipment, if the output voltage of described vibration detection device is more than or equal to certain threshold value, then think described vibration detection device place position or neighbouringly there is breakdown electric discharge; When there is breakdown electric discharge, by contrasting the vibration signal intensity captured from same GIL equipment, then can think that the position of the vibration signal pick-up unit position distance generation breakdown electric discharge collecting strongest signal strength is nearest;
Described vibration detection device comprises sensor, the vibration signal of reception is converted to voltage signal and exports by described sensor, and carry out signal condition by low-pass filter circuit unit, subtraction circuit unit, amplifier circuit unit, and by radio-frequency module, voltage signal is exported successively;
Described low-pass filter circuit unit is for realizing the high-frequency interferencing signal in filtering vibration signal;
Described subtraction circuit unit removes sensor output signal DC biased level for realizing;
Described amplifier circuit unit is used for realizing amplifying vibration signal;
Described radio frequency unit is used for, in substation, vibration signal data are carried out wireless transmission and reception;
Described threshold value sets according to site test after having disposed described vibration detection device.
2. system according to claim 1, it is characterized in that, preferably, described system also comprises intelligent slave computer, described intelligent slave computer receives the data of described vibration detection device, uses microprocessor to be calculated the energy of the vibration signal that each vibration detection device gathers by short-time energy method.
3. system according to claim 2, is characterized in that, described intelligent slave computer is by communicating between zigbee agreement with described vibration detection device.
4. system according to claim 2, it is characterized in that, described system also comprises host computer, and described host computer uses the threshold value of vibration detection device described in software design patterns, when the vibration signal that described vibration detection device detects is more than or equal to described threshold value, described software startup writing function; Otherwise it is invalid the data of reception to be considered as.
5. system according to claim 4, it is characterized in that, the vibration signal energy of same GIL equipment that described host computer is transmitted by the intelligent slave computer of contrast, judges the vibration detection device of most strong vibration energy, and then positions described vibration detection device and mark.
6. system according to claim 4, it is characterized in that, described intelligent slave computer uses CAN to carry out signal output, and the signal of output is converted to after light signal through optical fiber modulation module and uses optical fiber to carry out Signal transmissions, then becomes electric signal at host computer through optical fibre interrogation module converts.
7. system according to claim 4, is characterized in that, vibration signal shows with the form of squiggle by described host computer.
8. system according to claim 4, is characterized in that, when described upper computer detection is discharged to breakdown, then reports to the police.
9. system according to claim 4, is characterized in that, can carry out storing to the data of record at described host computer and derive.
10. system according to claim 1, is characterized in that, described system is applicable to the detection & localization of the breakdown electric discharge of the GIL equipment of 550kV grade and following grade.
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| CN107677938A (en) * | 2016-08-02 | 2018-02-09 | 中国电力科学研究院 | Extra-high-voltage alternating current mixed gas GIL line segment Partial discharge signal measuring methods |
| CN107677935A (en) * | 2016-08-02 | 2018-02-09 | 中国电力科学研究院 | The powered examination line segment industrial frequency withstand voltage test methods of extra-high-voltage alternating current mixed gas GIL |
| CN107677937A (en) * | 2016-08-02 | 2018-02-09 | 中国电力科学研究院 | Extra-high-voltage alternating current mixed gas GIL line segment Partial discharge signal Fault Locating Methods |
| CN108279365A (en) * | 2018-04-18 | 2018-07-13 | 国网江苏省电力有限公司电力科学研究院 | Spatial electromagnetic wave monitoring positioning device, system and method in a kind of GIL piping lanes |
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| CN111596168A (en) * | 2020-05-22 | 2020-08-28 | 中国矿业大学 | Fault positioning method based on GIL distribution thermal characteristic difference |
| CN115514690A (en) * | 2022-09-01 | 2022-12-23 | 西北工业大学 | Non-cooperative underwater acoustic network MAC protocol identification method |
| CN115514690B (en) * | 2022-09-01 | 2023-08-22 | 西北工业大学 | Non-cooperative underwater acoustic network MAC protocol identification method |
| CN117192311A (en) * | 2023-11-06 | 2023-12-08 | 国网天津市电力公司电力科学研究院 | Discharge detection device and method |
| CN117192311B (en) * | 2023-11-06 | 2024-05-24 | 国网天津市电力公司电力科学研究院 | Discharge detection device and method |
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Application publication date: 20150610 |