CN201540350U - Hyper-high-frequency signal receiving device for detecting local discharge - Google Patents
Hyper-high-frequency signal receiving device for detecting local discharge Download PDFInfo
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- CN201540350U CN201540350U CN 200920309383 CN200920309383U CN201540350U CN 201540350 U CN201540350 U CN 201540350U CN 200920309383 CN200920309383 CN 200920309383 CN 200920309383 U CN200920309383 U CN 200920309383U CN 201540350 U CN201540350 U CN 201540350U
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Abstract
The utility model relates to a hyper-high-frequency signal receiving device for detecting local discharge for detecting and positioning insulation defects from external part of an air insulation switch device, which includes a hyper-high-frequency signal transducer, a pre-amplifier connected to a signal output terminal of the hyper-high-frequency signal transducer, a frequency mixer connected to a signal output terminal of the pre-amplifier, a frequency synthesizer connected to the local oscillation signal terminal of the frequency mixer, a signal amplifier connected to an intermediate frequency output terminal of the frequency mixer, a low-pass filter connected to an output terminal of the signal amplifier, a detection log amplifier connected to a signal output terminal of the low-pass filter, as well as a data acquisition card connected to a signal output terminal of the detection log amplifier; the output end of the data acquisition card is connected to the hyper-high-frequency signal input terminal of the central control unit, and the an excess voltage protector is connected between the signal output terminal of the hyper-high-frequency signal transducer and the earth wire in a series connection.
Description
Technical field
The utility model relates to the technical field of the safety detection device of electric system mesohigh insulator arrangement, specifically is a kind of Partial Discharge Detection ultra-high frequency signal receiving trap.
Background technology
Gas-insulated switchgear device has at home and abroad obtained more and more widely using because floor area is little, reliability is high, be subjected to external environment influence little, and shock resistance reaches advantages such as easy to maintenance by force.It is to be connected by the metal contact of seal flange with the inner conductive bar such as power equipments such as isolating switch, disconnector, grounding switch, TA (current transformer), TV (voltage transformer (VT)), buses that gas-insulated switchgear device is formed structure, be sealed in the closed metal cavity of the SF6 gas that is filled with certain pressure, because SF6 gas good insulation performance performance, therefore compare open type transformer station, whole gas-insulated switchgear device physical dimension can be done lessly, but simultaneously the manufacturing and the packaging technology of whole device is also had higher requirement.
Mostly domestic gas-insulated switchgear device equipment is to sue for peace in the eighties in 20th century and begins to drop into operation of power networks the beginning of the nineties, 20 years have nearly been moved at present, to the stage occurred frequently of an accident, have constantly when about the declaration of an accident of gas-insulated switchgear device also being recent years, therefore align insulating property that the gas-insulated switchgear device that is in operation is not equipped with and follow the tracks of detection and be necessary, the principal element that influences this apparatus insulated performance has: the water cut of SF6 gas, the inside of insulated support or surface imperfection, in the manufacture process or the free metal particulate of generation in service, the burr projection of electrode surface, because the legacy that causes in floating potential that screw is loosening or loose contact causes and the installation process etc.The topmost tendency performance of these potential defectives is exactly a shelf depreciation.Therefore detected gas insulated switch shelf depreciation can be found the insulation defect that it is inner early stage, and these early defects are taken appropriate measures, and can avoid the grid power blackout that is caused by the gas-insulated switchgear device accident.
Because gas-insulated switchgear device structurally is totally enclosed, directly detect its failure symptom that may occur internally and realize trouble technically, and must be on production link, directly some sensor or other pick-up units to be installed in gas-insulated switchgear device inside in gas-insulated switchgear device producer, these pick-up units itself just may be one of reasons that causes fault sometimes, and therefore domestic and international most of producer and gas-insulated switchgear device user generally do not wish to adopt built-in online detection mode.
Therefore, prior art can't and be located its shelf depreciation from the gas-insulated switchgear device external detection, gives early detection, locatees its built-in electrical insulation defective and take corresponding measure to cause difficulty.
The utility model content
Technical problem to be solved in the utility model provides a kind of Partial Discharge Detection ultra-high frequency signal receiving trap, is used for from the gas-insulated switchgear device external detection, locatees its insulation defect.
For solving the problems of the technologies described above, Partial Discharge Detection of the present utility model ultra-high frequency signal receiving trap comprises: the ultra-high frequency signal sensor, the prime amplifier that links to each other with the signal output part of ultra-high frequency signal sensor, the frequency mixer that links to each other with the signal output part of prime amplifier, the frequency synthesizer that links to each other with the local oscillation signal end of frequency mixer, the signal amplifier that links to each other with the medium frequency output end of frequency mixer, the low-pass filter that links to each other with the output terminal of signal amplifier, the detection logarithmic amplifier that links to each other with the signal output part of low-pass filter, and the data collecting card that links to each other with the signal output part of detection logarithmic amplifier; The output terminal of data collecting card links to each other with the ultra-high frequency signal input end of central control unit, is in series with overvoltage protector between the signal output part of ultra-high frequency signal sensor and the ground wire.
Further, described ultra-high frequency signal sensor comprises: the rectangular metal paster of pasting up and down, the dielectric-slab and the metal base plate of polystyrene material successively; Be connected with the coaxial probe feeding interface on the rectangular metal paster, signal is drawn to described prime amplifier by 50 Ω coaxial radio frequency cables; Described dielectric-slab is a wedge shape.
Further, any two sides of the bottom of described metal base plate and ultra-high frequency signal sensor are provided with metal shield materials (being generally conductive rubber), can wrap disc insulator along two sides, prevent that undesired signal from entering sensor.
The utlity model has positive effect: use in the gas-insulated switchgear device partial discharge detecting system of ultra-high frequency signal receiving trap of the present utility model (1), a lot of disc insulators are arranged on the gas-insulated switchgear device usually, the external insulated part of disc insulator is generally poured with epoxy resin spare and teflon etc., and the frequency electromagnetic waves that shelf depreciation produced can penetrate them easily and be radiated outside.The frequency electromagnetic waves that the inner shelf depreciation of gas-insulated switchgear device excites (300M～when 3GHz) propagating through disc insulator, it is external to be radiated gas-insulated switchgear device by epoxy resin etc., shelf depreciation also produces ultrasonic signal simultaneously, ultrasound wave is decayed very fast in gas, but then decay is little in metal.Longer owing to hyperacoustic wavelength simultaneously, so its directivity is stronger, energy is more concentrated.By receiving this acoustical signal, by diagnosing out to the analysis and judgement of acoustical signal whether shelf depreciation has taken place attached to the sonac on the shell.
(2) ultrasound wave is received battle array and place ultrahigh frequency to receive in the battle array, and make their center coincide with same point, purpose is to make point of discharge consistent with the elevation angle to the position angle of the phased reception front scanning of ultrahigh frequency and ultrasound wave, calculates and handles so that simplify.
(3) measurement of partial discharge only is concerned about the peak value of signal and the phase place of appearance thereof usually, ultra-high frequency signal is collected also undistortedly have little significance, and data volume is very big data processing difficulty height.Therefore, must handle signal, the feasible signal of a certain centre frequency of the certain bandwidth of gating hyper band arbitrarily, signal is adjusted to the treatable frequency range of general data capture card, and keep features such as its peak value and phase place, reaching can detection signal, avoids disturbing, and reduces the purpose of technical requirement again.Ultra-high frequency signal receiving trap based on frequency mixing technique of the present utility model just can be realized this function.From application point, the frequency of discharge signal is fallen lowly more, just can reduce equipment manufacturing cost greatly, yet, consider that ultra-high frequency signal is fainter, the bandwidth of acquired signal is too narrow, frequency is just fallen lowly more, and the useful information amount that comprises is just few more, and it is bigger to analyze difficulty; Otherwise, though increased the quantity of information of detection signal, be easy to introduce the communication undesired signal, therefore, choosing of frequency reducing is that process range, signal bandwidth and external interference with common capture card interrelates, and frequency should be reduced to about 40MHz from comprehensive consideration.Simultaneously, frequency mixing technique is actually the envelope that extracts required frequency band signals, and it has kept the peak value and the phase characteristic of former discharge signal ultrahigh frequency component, but can not restore original signal fully, therefore should not adopt multistage mixing, adopts the one-level mixing comparatively suitable.
(4) the ultra-high frequency signal sensor that adopts of the utility model has adopted external UHF microstrip antenna sensor, and it sticks on the back side by the rectangular metal paster has and form on the dielectric-slab of conductor ground plate.This sensor utilizes the slit between metal patch and the metal base plate to receive uhf electromagnetic wave, and be converted into high-frequency current, carry out feed with coaxial probe as feeder line, and the coaxial radio frequency cable by 50 Ω is transferred to prime amplifier in the ultra-high frequency signal receiving trap to signal.This sensor is installed in the disc insulator outer rim place in the gas-insulated switchgear device, receives from the uhf electromagnetic wave of disc insulator to external leakage, and the surrounding space electromagnetic interference (EMI) is had good inhibitory effect.Its effective working band is 400-1200MHz (standing-wave ratio (SWR)＜2), reached all channel antenna scope, and the gain on greatest irradiation and the receive direction has reached 5.38dBi.Wherein, dielectric-slab is selected the lower polystyrene material of specific inductive capacity for use, and its specific inductive capacity is 2.62.
The bandwidth of ultra-high frequency signal sensor can represent with the percentage of the ratio of centre frequency with the high-end frequency and the difference of low side frequency, promptly
In the formula: f
0Be centre frequency.The pulse energy of shelf depreciation almost is directly proportional with frequency span, and the narrow-band characteristic of ultra-high frequency signal sensor is to have the resonance person's character of its high Q to determine, the energy that promptly is stored in the ultra-high frequency signal sensor construction is more much bigger than radiation and other energy loss, realized coupling when this means resonance, and the reactive component drastic change makes it mismatch during frequency departure resonance.Total quality factor q of ultra-high frequency signal sensor is:
Description of drawings
Fig. 1 is the circuit block diagram of the gas-insulated switchgear device partial discharge detecting system among the embodiment;
Fig. 2 is the partial cross sectional views of the gas-insulated switchgear device among the embodiment;
Fig. 3 is the circuit block diagram of the ultra-high frequency signal receiving trap in the described partial discharge detecting system;
Fig. 4 is the contour structures synoptic diagram of the ultra-high frequency signal sensor in the described partial discharge detecting system.
Embodiment
(embodiment 1)
See Fig. 3-4, described ultra-high frequency signal receiving trap comprises: ultra-high frequency signal sensor UHF, the prime amplifier 10 that links to each other with the signal output part of ultra-high frequency signal sensor UHF, the frequency mixer 11 that links to each other with the signal output part of prime amplifier 10, the frequency synthesizer 16 that links to each other with the local oscillation signal end of frequency mixer 11, the signal amplifier 12 that links to each other with the medium frequency output end of frequency mixer 11, the low-pass filter 13 that links to each other with the output terminal of signal amplifier 12, the detection logarithmic amplifier 14 that links to each other with the signal output part of low-pass filter 13, and the data collecting card 15 that links to each other with the signal output part of detection logarithmic amplifier 14; The output terminal of data collecting card 15 links to each other with the ultra-high frequency signal input end of central control unit 1, is in series with overvoltage protector 17 between the signal output part of ultra-high frequency signal sensor UHF and the ground wire.
Described ultra-high frequency signal sensor UHF comprises: rectangular metal paster A, the dielectric-slab B and the metal base plate C of polystyrene material that pastes up and down successively; Be connected with coaxial probe feeding interface D on the rectangular metal paster A, signal is drawn to described prime amplifier 10 by 50 Ω coaxial radio frequency cables; Described dielectric-slab B is a wedge shape.
Any two sides of the bottom of described metal base plate C and ultra-high frequency signal sensor UHF are provided with metal shield materials.
The ultra-high frequency signal receiving trap transforms to intermediate frequency with the frequency of input signal or the carrier frequency of modulated signal in the presence of local oscillation signal, and keeps keeping features such as its peak value and phase place, and this frequency conversion process is called mixing.
Wherein: overvoltage protector 17 can prevent that the transient state high-energy from damaging signal condition unit and data collecting card.Prime amplifier 10, be used to guarantee discharge signal through after the long-distance transmissions during arriving signal conditioning unit power magnitude of signal meet its input range.The frequency band range of the broadband amplifiers that system is used is 0-800MHz, the working band of covering system.Frequency mixer 11 mainly plays the frequency reducing effect, promptly exports the difference frequency signal of local oscillation signal and input signal.The local oscillator input range of the frequency mixer of selecting for use in the system is 20MHz-1.5GHz, and the intermediate frequency output area is DC-1GHz, and dynamic range is 60dB.Frequency synthesizer 16, major function are to produce the local oscillation signal that meets the demands, by program control this unit of computer parallel interface, the centre frequency of scalable acquired signal thus.The centre frequency scope that this system is adjustable is 400-1200MHz, and minimum step is 25MHz.Signal amplifier 12 amplifies the intermediate-freuqncy signal of frequency mixer output, satisfies the needs of subsequent treatment.Low-pass filter 13, its effect be after the filtering mixing and frequency component, output difference frequency component.System design 7 rank Chebyshev LC low-pass filters.Can change the bandwidth of gating frequency band by the bandwidth that changes low-pass filter, it is optional that bandwidth is set to two kinds of gears of 25MHz, 50MHz, and this operation realizes by parallel port of computing machine.Detection logarithmic amplifier 14 carries out detection (envelope extraction) and amplification to the signal by low-pass filter output.
Through local discharge superhigh frequency signal (centre frequency is between 400-1200MHz, and bandwidth is that 25MHz, 50MHz are optional) behind the mixing conditioning unit but frequency reducing is the signal that is lower than 20MHz, conditioned signal can be sent into capture card at last and carry out data processing.
The application of frequency mixing technique has been equivalent to realize the bandpass filter that bandwidth is optional, centre frequency is adjustable, (centre frequency is between 400-1200MHz with the local discharge superhigh frequency signal for it, bandwidth is that 25MHz, 50MHz are optional) frequency reducing is the signal that is lower than 20MHz, and kept features such as the peak value of signal and phase place.Can extract the ultra high frequency discharge signal of gas-insulated switchgear device typical case shelf depreciation model effectively with frequency mixing technique, can calculate the discharge correlation parameter exactly, not only avoided interference but also comprised discharge information as much as possible, on performance and applicability, be more suitable for carrying out the local discharge superhigh frequency on-line monitoring than spectrum analyzer and full range band direct detection method.
(application examples 1)
See Fig. 1-2, use the gas-insulated switchgear device partial discharge detecting system of ultra-high frequency signal receiving trap of the present utility model, comprising: the ultra-high frequency signal receiving trap of outer rim 9 that is used for being arranged on the disc insulator 7 of gas-insulated switchgear device, be used to be arranged on the gas-insulated switchgear device outer wall 6 ultrasonic probe, ultrasonic receiver, central control unit 1, and the display 2 that links to each other with central control unit 1, the GPRS3 that is used to provide wireless telecommunications that links to each other with central control unit 1, what link to each other with central control unit 1 is used for LAN (Local Area Network) communication unit 4 with remote monitoring center 5 communications.Disc insulator 7 is enclosed within on the inner wire 8 of gas-insulated switchgear device.
Central control unit 1 receives continuously from the ultra-high frequency signal of ultra-high frequency signal receiving trap and the ultrasound wave of ultrasonic probe, ultrasonic receiver, and judges whether described ultra-high frequency signal and ultrasound wave continue to exist correlativity; Described correlativity is meant: the amplitude of ultra-high frequency signal, phase characteristic collection of illustrative plates and hyperacoustic amplitude, phase characteristic collection of illustrative plates are corresponding; If described ultra-high frequency signal and ultrasound wave continue to exist correlativity, the detection position of then repeatedly mobile ultrasonic probe, ultrasonic receiver on the gas-insulated switchgear device outer wall, and write down appearance maximum amplitude in the amplitude Characteristics collection of illustrative plates of the ultra-high frequency signal on each detection position and the mistiming of the appearance maximum amplitude in hyperacoustic amplitude Characteristics collection of illustrative plates is a time delay, go out the spacing of point of discharge and each detection position then according to each time-delay calculation, and calculate the position of the insulation defect in the gas-insulated switchgear device according to the physical dimension of each detection position and insulated switch.
If described ultra-high frequency signal and ultrasound wave continue not exist correlativity, but have a plurality of different phase characteristic collection of illustrative plates, then judge to have a plurality of insulation defects in the gas-insulated switchgear device; Then, by mobile ultrasonic probe, ultrasonic receiver repeatedly on the gas-insulated switchgear device outer wall the detection position and write down corresponding ultrasonic signal intensity and amplitude Characteristics, determine the zone at each the insulation defect place in the gas-insulated switchgear device at last.
The shelf depreciation spectrogram that with the phase place is variable has reflected the distribution by phase place in power frequency period of discharge capacity and number of times, the phase window that the phase place of 0～360 degree is divided into some, observe the Characteristics of Partial Discharge in each phase window, thereby form a complete shelf depreciation spectrogram that comprises all phase places.
(application examples 2)
On the basis of embodiment 1, described gas-insulated switchgear device partial discharge detecting system has following distortion: the square formation that 16 ultra-high frequency signal receiving traps is constituted 4 * 4 array elements receives battle array to constitute ultrahigh frequency, the square formation that 64 ultrasonic probe, ultrasonic receivers is constituted 8 * 8 array elements receives battle array to constitute ultrasound wave, array element distance in the ultrahigh frequency reception battle array equates and is 2-5m, array element distance in the ultrasound wave reception battle array equates and is 0.2m, and ultrasound wave receives battle array and places ultrahigh frequency to receive battle array and constitute a flat surface sensor, and ultrasound wave receives the central point that battle array and ultrahigh frequency receive gust and overlaps.
Central control unit 1 receives the detected local discharge superhigh frequency electromagnetic wave signal of battle array as time reference with ultrahigh frequency, draw the time delay of the ultrasonic signal that each ultrasonic probe, ultrasonic receiver receives, and then calculate the spacing of point of discharge and each ultrasonic probe, ultrasonic receiver, and calculate the position of the insulation defect in the gas-insulated switchgear device according to the physical dimension of the position of each ultrasonic probe, ultrasonic receiver and insulated switch.
Claims (3)
1. a Partial Discharge Detection ultra-high frequency signal receiving trap is characterized in that comprising: ultra-high frequency signal sensor (UHF), the prime amplifier (10) that links to each other with the signal output part of ultra-high frequency signal sensor (UHF), the frequency mixer (11) that links to each other with the signal output part of prime amplifier (10), the frequency synthesizer (16) that links to each other with the local oscillation signal end of frequency mixer (11), the signal amplifier (12) that links to each other with the medium frequency output end of frequency mixer (11), the low-pass filter (13) that links to each other with the output terminal of signal amplifier (12), the detection logarithmic amplifier (14) that links to each other with the signal output part of low-pass filter (13), and the data collecting card (15) that links to each other with the signal output part of detection logarithmic amplifier (14); The output terminal of data collecting card (15) links to each other with the ultra-high frequency signal input end of central control unit (1), is in series with overvoltage protector (17) between the signal output part of ultra-high frequency signal sensor (UHF) and the ground wire.
2. Partial Discharge Detection ultra-high frequency signal receiving trap according to claim 1 is characterized in that: described ultra-high frequency signal sensor (UHF) comprising: the rectangular metal paster of pasting up and down (A), the dielectric-slab (B) and the metal base plate (C) of polystyrene material successively; Be connected with coaxial probe feeding interface (D) on the rectangular metal paster (A), signal is drawn to described prime amplifier (10) by 50 Ω coaxial radio frequency cables; Described dielectric-slab (B) is a wedge shape.
3. Partial Discharge Detection ultra-high frequency signal receiving trap according to claim 2 is characterized in that: two sides of the bottom of described metal base plate (C) and ultra-high frequency signal sensor (UHF) are provided with metal shield materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920309383 CN201540350U (en) | 2009-09-01 | 2009-09-01 | Hyper-high-frequency signal receiving device for detecting local discharge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920309383 CN201540350U (en) | 2009-09-01 | 2009-09-01 | Hyper-high-frequency signal receiving device for detecting local discharge |
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| CN201540350U true CN201540350U (en) | 2010-08-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257305A (en) * | 2012-02-21 | 2013-08-21 | 国家电网公司 | External ultrahigh frequency detecting sensor and detecting method thereof |
| CN104931868A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Partial discharge detection device |
| CN106872869A (en) * | 2017-02-14 | 2017-06-20 | 吴笃贵 | Embedded partial discharge monitoring intelligence instrument based on pulse current method |
| CN109116204A (en) * | 2018-11-05 | 2019-01-01 | 国网四川省电力公司电力科学研究院 | A kind of transformer partial discharge signal sorter and fault detection means |
| CN110045256A (en) * | 2019-05-17 | 2019-07-23 | 广东电网有限责任公司 | A kind of SHF frequency range local discharge signal reception circuit |
| CN110780237A (en) * | 2019-09-18 | 2020-02-11 | 国网北京市电力公司 | Distributed ultrahigh frequency sensor |
| CN113484812A (en) * | 2021-05-26 | 2021-10-08 | 广西电网有限责任公司南宁供电局 | Measuring device and measuring method of capacitive voltage transformer |
-
2009
- 2009-09-01 CN CN 200920309383 patent/CN201540350U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257305A (en) * | 2012-02-21 | 2013-08-21 | 国家电网公司 | External ultrahigh frequency detecting sensor and detecting method thereof |
| CN104931868A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Partial discharge detection device |
| CN106872869A (en) * | 2017-02-14 | 2017-06-20 | 吴笃贵 | Embedded partial discharge monitoring intelligence instrument based on pulse current method |
| CN109116204A (en) * | 2018-11-05 | 2019-01-01 | 国网四川省电力公司电力科学研究院 | A kind of transformer partial discharge signal sorter and fault detection means |
| CN110045256A (en) * | 2019-05-17 | 2019-07-23 | 广东电网有限责任公司 | A kind of SHF frequency range local discharge signal reception circuit |
| CN110780237A (en) * | 2019-09-18 | 2020-02-11 | 国网北京市电力公司 | Distributed ultrahigh frequency sensor |
| CN113484812A (en) * | 2021-05-26 | 2021-10-08 | 广西电网有限责任公司南宁供电局 | Measuring device and measuring method of capacitive voltage transformer |
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Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20121016 |
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Effective date of registration: 20121016 Address after: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee after: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee before: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. |
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