CN208421150U - A kind of device for Partial Discharge Detection - Google Patents

Abstract

The utility model discloses a kind of device for Partial Discharge Detection, strong antijamming capability can accurately diagnose electric discharge type, and compact-sized, the various Partial Discharge Detections suitable for testing location environment complexity.The device includes: sensor, signal processing module, analog-digital converter ADC, on-site programmable gate array FPGA, CPU and communication module；Signal processing module to detection signal amplify, filter and by input detection signal set of frequency ADC input range；ADC is used to carry out number conversion to detection signal according to the sampling clock from FPGA to obtain digital signal；FPGA caches received digital signal, carries out digital filtering processing according to control command come the digital signal to caching；Parameter calculating module is used to calculate the shelf depreciation numerical value for indicating shelf depreciation power according to the data from FPGA；As a result output module is for exporting partial enlargement numerical value for display.

Description

A kind of device for Partial Discharge Detection

Technical field

The utility model relates to Partial Discharge Detecting Technology field more particularly to a kind of dresses for Partial Discharge Detection It sets.

Background technique

Shelf depreciation is a kind of pulsed discharge, it can inside and around power equipment space generate a series of sound, light, Electrically and mechanically physical phenomenons and the chemical change such as vibration.These various physical and chemical changes generated with shelf depreciation are It monitors power equipment built-in electrical insulation state and detection signal is provided.It, usually can be along with when occurring insulation defect in equipment under test The generation of local discharge signal.By the detection and analysis to local discharge signal, judge inside equipment under test with the presence or absence of exhausted Edge hidden danger prevents the further expansion of latent defect from causing heavy economic losses and casualties.

Dielectric strength and disruptive field intensity are all very high in Electric Power Equipment Insulation body, when shelf depreciation occurs to a very small extent When, breakdown process quickly, will generate very steep pulse current, the rise time is less than 1ns, and stimulating frequency is up to number GHz's Electromagnetic wave.Partial Discharge Detecting Technology first is that superfrequency (UHF) method, the basic principle is that by extra-high video sensor to electric power The ultrahigh frequency electromagnetic wave signal generated when shelf depreciation in equipment is detected, so that the relevant information of shelf depreciation is obtained, it is real Existing partial discharge monitoring.Since the corona interference at scene is concentrated mainly on 300MHz frequency range hereinafter, therefore superfrequency method can be effective Ground avoids the corona interference at scene, sensitivity with higher and anti-interference ability, it can be achieved that shelf depreciation live detection, positioning And the advantages that Classifcation of flaws.

Partial Discharge Detection is also based on ultrasonic wave progress.Power equipment can generate acoustic signals during discharge. The frequency spectrum for the sound wave that electric discharge generates is very wide, can be from several kHz to several MHz, and wherein signal of the frequency lower than 20kHz can be by human ear It hears, and the ultrasonic signal for being higher than this frequency must can just be received with ultrasonic sensor.According to the energy of electric discharge release Relationship between amount and sound energy, represents the variation that shelf depreciation is released energy with the variation of ultrasonic signal acoustic pressure, passes through survey The acoustic pressure for measuring ultrasonic signal, can deduce the power of electric discharge.

Partial Discharge Detection can also use high-frequency pulse current method.Shelf depreciation is all in positive and negative charge each time With can supervene high-frequency pulse current, judge the power of shelf depreciation by measuring this pulsed current signal, measure this arteries and veins The method of electric current is rushed pulse current method.This pulse electricity is measured from the down conductor of power equipment using High Frequency Current Sensor Stream obtains the information such as discharge capacity and discharge phase, and processor is recycled to be diagnosed.It the advantage is that information is rich in pulse current Richness provides basic foundation for diagnosis；There is higher measurement sensitivity for jump signal, be easy to find failure；With compared with subject to True calibration method is convenient for quantitative test.

Another detection method for local discharge can be carried out based on transient earth voltage.When shelf depreciation occurs, point of discharge High-frequency current wave is generated, and is propagated to both direction；It is influenced by kelvin effect, current wave is focusing only on metal cabinet inner surface It propagates, without being directed through；Junction is disconnected or insulate in metal, current wave is transferred to outer surface, and with electromagnetic wave Freedom of entry space；Electromagnetic wave rising edge encounters outer metallic surface, generates transient state voltage-to-ground (Transient Earth Voltage)；Transient state voltage-to-ground can measure its amplitude and discharge capacity with transient earth voltage sensor, it passes through single only electricity Hold coupling type sensor to be detected in the grounded metal enclosure of tested equipment.Detector can detecte out due to shelf depreciation Caused by transient voltage pulse signal, partial dis-charge activity each time is reflected by the amplitude and frequency of momentary voltage pulse Power, to judge the operating condition of tested equipment.

In existing Partial Discharge Detecting Technology, for example, Authorization Notice No. is the Chinese utility model of CN207502667U Patent discloses a kind of local discharge detection device, and detection unit is contacted with the shading ring of two disc insulators, to obtain Partial discharge pulse's signal corresponding with two disc insulators.Existing Partial Discharge Detection scheme including the program is extremely It has the following technical problems less: electric discharge type can not accurately be diagnosed, need by manually judging electric discharge type with experience；It is right It is not in place in the processing of source signal, the interference of noise is caused to influence final discharge examination and type judgement；It is testing In the complicated application of place and environment, sensor needs to pass signal back host with very long signal wire, causes device structure complicated And hardware cost is higher.

Utility model content

One of the purpose of this utility model at least that, for how to overcome the above-mentioned problems of the prior art, provide A kind of device for Partial Discharge Detection, strong antijamming capability can accurately diagnose electric discharge type, and compact-sized, Various Partial Discharge Detections suitable for testing location environment complexity.

To achieve the goals above, the technical solution adopted in the utility model includes following aspects.

A kind of device for Partial Discharge Detection comprising: sensor, signal processing module, analog-digital converter ADC, On-site programmable gate array FPGA, CPU and communication module；

Wherein, sensor is used to obtain detection signal from detected object, and is transmitted to signal processing module；Signal processing Module includes amplifying circuit, filter circuit and peak-detector circuit, be respectively used to amplify detection signal, filter, with And by input detection signal set of frequency ADC input range；ADC is used for according to the sampling clock from FPGA to inspection It surveys signal and carries out number conversion to obtain digital signal, and be sent to FPGA；FPGA has cache unit and digital filter unit, point Received digital signal Yong Yu not cached, digital filtering processing is carried out come the digital signal to caching according to control command；

CPU has parameter calculating module and result output module, and wherein parameter calculating module is used for according to from FPGA's Data calculate the shelf depreciation numerical value for indicating shelf depreciation power；As a result output module is for exporting partial enlargement numerical value for aobvious Show.

Preferably, the result output module is directly connect with display, to show to local discharging value；Or Person, as a result output module is connect with communication module is sent to mobile terminal for partial enlargement numerical value.

Preferably, the amplifying circuit includes sequentially connected voltage follower circuit, reverse amplification circuit and addition electricity Road.

Preferably, in the voltage follower circuit, detection signal is same via the 9th resistance input second operational amplifier Phase input terminal, and the inverting input terminal of operational amplifier is connected with its output end external circuit is isolated, and will test signal It is sent to reverse amplification circuit.

Preferably, in the reverse amplification circuit, detection signal is via the 14th resistance input third operational amplifier Inverting input terminal；The detection signal for being amplified to ADC input voltage range is transmitted to addition by the output end of third operational amplifier Circuit, and inverting input terminal, the non-inverting input terminal ground connection of third operational amplifier are connected to via thirteenth resistor.

Preferably, in the add circuit, the detection signal by amplification inputs the 4th operation via twelfth resistor and puts The reverse input end of big device；The reverse input end of four-operational amplifier is connect via the 17th resistance with reference voltage respectively, It is connect via the 18th resistance with the output end of four-operational amplifier；The noninverting input of four-operational amplifier is grounded, the The output end of four-operational amplifier is connect with filter circuit.

Preferably, in the filter circuit, detection signal inputs the first operation amplifier via the 8th resistance and 3rd resistor The reverse input end of device；The reverse input end of first operational amplifier is via the 4th capacitance connection to its output end；First operation The noninverting input of amplifier is grounded；The output end of first operational amplifier respectively via the 4th resistance and the second capacity earth, The reverse input end of the 6th operational amplifier is connected to via second resistance and first resistor；6th operational amplifier it is reversed defeated Enter end via the 6th capacitance connection to its output end；The noninverting input of 6th operational amplifier is grounded；6th operational amplifier Output end respectively via the 6th resistance and third capacity earth, and be connected to peak-detector circuit.

Preferably, the ADC is realized using ADS807 chip, and FPGA uses A3P060/125 chip, and CPU is used STM32F407 processor chips.

Preferably, the communication module uses one of WIFI, GPRS, CDMA, WCDMA, EVDO, 3G, 4G or more Kind mobile radio telecommunications module, and public radio communication network is utilized to carry out data remote transmission.

Preferably, the filter circuit is set as low-frequency range 500MHz-700MHz, high band 1.1GHz-1.3GHz, full range Section tri- bandpass filtering structures of 300MHz-1.5GHz；Or

Filter circuit is set as the bandpass filtering of 10KHz, 20KHz, 30KHz high pass and the combination of 100KHz, 200KHz low pass Structure；Or

Filter circuit is set as the bandpass filtering structure of 1MHz-100MHz；Or

Filter circuit is set as tri- bandpass filtering structures of 1MHz-30MHz, 1MHz-5MHz, 5MHz-10MHz.

In conclusion by adopting the above-described technical solution, the utility model at least has the advantages that

It is tested by using terminal plus intelligence sensor mode, terminal is using mobile phone based on android system or puts down Plate, test software use APP mode, intelligence sensor both can single machine detection can also be with terminal On-line measurement.Detector terminal Wireless communication mode is used with intelligence sensor, it is compact structure, easy to operate, light-weight, scene is very suitable to GIS (Gas-insulatedMetal-enclosedSwitchgear, gas insulating metal closed type combined electrical apparatus) power distribution equipment is opened Close the local discharge of electrical equipment defects detections such as cabinet, cable and transformer.Simultaneously because use wireless communication mode, into When the equipment such as row GIS detect, detection position is narrow and bring is inconvenient the problems such as ascend a height is solved very well, alleviates inspection The risk of labor intensity and fall arrest is surveyed, while improving detection efficiency.At the position to the operation that needs to ascend a height, taken by high-altitude Partial Discharge Detection work can be completed in sample bar connection wireless intelligence sensor.Detector provides superfrequency, ultrasonic wave, high-frequency electrical A variety of local discharge detecting functions such as stream and transient earth voltage, can carry out comprehensive status assessment to tested power equipment.

Detailed description of the invention

Fig. 1 is the structural schematic diagram according to the device for Partial Discharge Detection of the utility model exemplary embodiment.

Fig. 2 is the voltage follower circuit structural schematic diagram according to the utility model exemplary embodiment.

Fig. 3 is the reverse amplification circuit structural schematic diagram according to the utility model exemplary embodiment.

Fig. 4 is the add circuit structural schematic diagram according to the utility model exemplary embodiment.

Fig. 5 is the filter circuit construction schematic diagrame according to the utility model exemplary embodiment.

Specific embodiment

With reference to the accompanying drawings and embodiments, the present invention will be further described in detail, so that the utility model Objects, technical solutions and advantages are more clearly understood.It should be appreciated that specific embodiment described herein is only to explain this reality With novel, it is not used to limit the utility model.

Fig. 1 shows the structural representation of the device for Partial Discharge Detection according to the utility model exemplary embodiment Figure.The device of the embodiment specifically includes that sensor, signal processing module, analog-digital converter ADC, field programmable gate array FPGA, CPU and communication module.

Wherein, sensor is used to obtain detection signal from detected object (such as various electrical equipments), and is transmitted to letter Number processing module；Signal processing module includes amplifying circuit, filter circuit and peak-detector circuit, is respectively used to detection Signal amplifies, filter and by the set of frequency of the detection signal of input ADC input range；ADC is used for according to next Number conversion is carried out to obtain digital signal to detection signal from the sampling clock of FPGA, and is sent to FPGA；FPGA has caching Unit and digital filter unit, be respectively used to cache received digital signal, according to control command come the digital signal to caching Carry out digital filtering processing；

CPU has parameter calculating module and result output module, and wherein parameter calculating module is used for according to from FPGA's Data calculate the shelf depreciation numerical value for indicating shelf depreciation power；As a result output module is for exporting partial enlargement numerical value for aobvious Show.Specifically, as a result output module can directly be connect with display, to show to local discharging value；Alternatively, result Output module is connect with communication module is sent to mobile terminal for partial enlargement numerical value.Wherein by communication module (for example, The mobile radio telecommunications modules such as WIFI, GPRS/CDMA/WCDMA/EVDO, 3G/4G) it is realized and is surveyed using public radio communication network Try data remote transmission.

Mobile terminal (for example, mobile phone, tablet computer, special digital terminal etc.) is by running corresponding APP, to be showed Row information record of going forward side by side is tested in field.Further, it is possible to which the variation tendency of real-time display signal, can believe between intuitively comparing difference test point Number difference, be convenient for shelf depreciation positioning judgement.Further, signal acquisition and frequency analysis can also be carried out, is shown Show generation moment and the typical statistic spectrogram of the original waveform of discharge signal.

Intelligent diagnostics module can be set on mobile terminal or remote server, for accurately identify external disturbance and The type of all kinds of shelf depreciations, such as the electric discharge of air gap bubble electric discharge, floating potential discharge, sharp-point conductor, creeping discharge and radar Interference, mobile phone interference etc.；And realize the early warning and alarm of test data.Has data storage, playback and figure storage function Can, and examining report can be directly generated.

Specifically, ADC can be realized using ADS807 chip, and FPGA can use A3P060/125 chip, and CPU can be with Using STM32F407 processor chips.

Parameter calculating module is used to calculate the power of shelf depreciation according to the detection data that FPGA is sent in CPU, and can Superfrequency (UHF), contact ultrasonic (AE), air type ultrasonic wave (AA), transient earth voltage are used with further setting (TEV), five kinds of detection modules of high-frequency current (HFCT), user can be by mobile terminals according to different types of high voltage electric equipment Design feature and testing requirements select suitable detection technique to be combined to detect to shelf depreciation, to reach most Good detection effect.

Wherein, superfrequency detection module, for the power equipments such as GIS, cable, switchgear to be implemented with the electrification of shelf depreciation Detection；Contact ultrasonic detection module, for the power equipments such as GIS, transformer implement shelf depreciation live detection and The positioning of local discharge signal；Transient earth voltage and air type ultrasound examination module, for the power equipments such as switchgear office The live detection of portion's electric discharge；High-frequency current detection module, the partial discharge for power equipments such as power transformer, reactor, cables Live detection.

Device/detector for Partial Discharge Detection in above-described embodiment can use intelligence sensor mode, often One detection module is all correspondingly arranged a kind of individual intelligence sensor, can be used alone, and can also be controlled using mobile terminal The mode of intelligence sensor forms test macro.It specifically may include multiple sensors, such as transient earth voltage collector, ultrasound Wave sensor, metal proximity sensor and small power electric inhale iron.

In a preferred embodiment, above-mentioned amplifying circuit may include sequentially connected voltage follower circuit, reversed amplification Circuit and add circuit.Fig. 2 shows the voltage follower circuit structural representations according to the utility model exemplary embodiment Figure.In the voltage follower circuit, detection signal inputs the non-inverting input terminal of second operational amplifier U2 via the 9th resistance R9, and And the inverting input terminal of operational amplifier U2 is connected with its output end external circuit is isolated, and be will test signal and be sent to reversely Amplifying circuit.

Fig. 3 shows the reverse amplification circuit structural schematic diagram according to the utility model exemplary embodiment.This is reversely put In big circuit, detection signal inputs the inverting input terminal of third operational amplifier U3 via the 14th resistance R14；Third operation is put The detection signal for amplifying (such as reversed 10 times of amplification) to ADC input voltage range is transmitted to addition electricity by the output end of big device U3 Road, and inverting input terminal, the non-inverting input terminal ground connection of third operational amplifier U3 are connected to via thirteenth resistor R13.

Fig. 4 shows the add circuit structural schematic diagram according to the utility model exemplary embodiment.In the add circuit, Detection signal by amplification inputs the reverse input end of four-operational amplifier U4 via twelfth resistor R12；4th operation The reverse input end of amplifier U4 is connect via the 17th resistance R17 with reference voltage VERF respectively, via the 18th resistance R18 It is connect with the output end of four-operational amplifier U4；The noninverting input of four-operational amplifier U4 is grounded, the 4th operation amplifier The output end of device U4 is connect with filter circuit.

Fig. 5 shows the filter circuit construction schematic diagrame according to the utility model exemplary embodiment.In the filter circuit, Detect the reverse input end that signal inputs the first operational amplifier U1 via the 8th resistance R8 and 3rd resistor R3；First operation is put The reverse input end of big device U1 is connected to its output end via the 4th capacitor C4；The noninverting input of first operational amplifier U1 connects Ground；The output end of first operational amplifier U1 is grounded via the 4th resistance R4 and the second capacitor C2 respectively, via second resistance R2 The reverse input end of the 6th operational amplifier U6 is connected to first resistor R1；The reverse input end of 6th operational amplifier U6 passes through Its output end is connected to by the 6th capacitor C6；The noninverting input of 6th operational amplifier U6 is grounded；6th operational amplifier U6 Output end be grounded respectively via the 6th resistance R6 and third capacitor C3, and be connected to peak-detector circuit.

Wherein, the corresponding filter circuit of superfrequency detection module is set as low-frequency range 500MHz-700MHz, high band Tri- bandpass filtering structures of 1.1GHz-1.3GHz, full frequency band 300MHz-1.5GHz.Contact ultrasonic detection module is corresponding Filter circuit is set as the bandpass filtering structure of 10KHz, 20KHz, 30KHz high pass and the combination of 100KHz, 200KHz low pass.Transient state The corresponding filter circuit of ground voltage detection module is set as the bandpass filtering structure of 1MHz-100MHz.High-frequency current detection module Corresponding filter circuit is set as tri- bandpass filtering structures of 1MHz-30MHz, 1MHz-5MHz, 5MHz-10MHz.Wherein, for High-frequency signal, operational amplifier can use AD8065 high speed amplifier chip.

In above-described embodiment, by using software and hardware frequency-selective filtering technology, ambient noise is effectively filtered out, such as radio carries The background noises such as wave；The interference signal for not meeting signal strength characteristics is filtered out using pulse authentication technique；Using phase spy Sign authentication technique filters out the interference signal of any phase point or phase section.

Mobile terminal or the display directly being connect with CPU, for real-time display measured signal variation tendency and put Electric strong and weak, offer shelf depreciation tendency chart；Superfrequency detection can set detection bandwidth and frequency filtering, and superfrequency detection provides The PRPS pulse train of explanation (phase), PRPS,Map, and amplitude tendency chart is provided.Ultrasound examination has continuous detection Mode, phase detection mode (PRPD), pulse detection mode (TOF), time domain waveform detection pattern, and can provide PRPS map and Amplitude trend map.Superfrequency, which detects, can set detection bandwidth and frequency filtering, superfrequency detection offer PRPS,Map, and Amplitude tendency chart is provided.Transient earth voltage detection provides shelf depreciation peak detection, provides the detection of recurrent pulse number and part is put Electric repetitive rate (discharge severity) detection.

May be arranged as except interior synchronize using electric current or voltage source signal, by wireless except through CPU Synchronizer and 2.4G module receive synch command, realize wireless outer synchronous.

The above, the only detailed description of specific embodiment of the present invention, rather than limitations of the present invention. Those skilled in the technology concerned in the case where not departing from the principle and range of the utility model, the various replacements made, Modification and improvement should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of device for Partial Discharge Detection, which is characterized in that described device include: sensor, signal processing module, Analog-digital converter ADC, on-site programmable gate array FPGA, CPU and communication module；

Wherein, sensor is used to obtain detection signal from detected object, and is transmitted to signal processing module；Signal processing module Including amplifying circuit, filter circuit and peak-detector circuit, it is respectively used to that detection signal is amplified, filtered and incited somebody to action Input range of the set of frequency of the detection signal of input in ADC；ADC is used to believe detection according to the sampling clock from FPGA Number number conversion is carried out to obtain digital signal, and be sent to FPGA；FPGA has cache unit and digital filter unit, uses respectively Digital filtering processing is carried out in the received digital signal of caching, according to control command come the digital signal to caching；

CPU has parameter calculating module and result output module, and wherein parameter calculating module is used for according to the data from FPGA Calculate the shelf depreciation numerical value for indicating shelf depreciation power；As a result output module is for exporting partial enlargement numerical value for display.

2. device according to claim 1, which is characterized in that the result output module is directly connect with display, with right Shelf depreciation numerical value is shown；Alternatively, result output module is connect with communication module is sent to movement for partial enlargement numerical value Terminal.

3. device according to claim 1, which is characterized in that the amplifying circuit includes sequentially connected voltage follow electricity Road, reverse amplification circuit and add circuit.

4. device according to claim 3, which is characterized in that in the voltage follower circuit, detection signal is via the 9th electricity Resistance input second operational amplifier non-inverting input terminal, and the inverting input terminal of operational amplifier connect with its output end with every From external circuit, and it will test signal and be sent to reverse amplification circuit.

5. device according to claim 3, which is characterized in that in the reverse amplification circuit, detect signal via the 14th The inverting input terminal of resistance input third operational amplifier；The output end of third operational amplifier will be amplified to ADC input voltage The detection signal of range is transmitted to add circuit, and is connected to inverting input terminal, third operational amplifier via thirteenth resistor Non-inverting input terminal ground connection.

6. device according to claim 3, which is characterized in that in the add circuit, detection signal by amplification via The reverse input end of twelfth resistor input four-operational amplifier；The reverse input end of four-operational amplifier is respectively via 17 resistance are connect with reference voltage, are connect via the 18th resistance with the output end of four-operational amplifier；4th operation is put The noninverting input ground connection of big device, the output end of four-operational amplifier are connect with filter circuit.

7. device according to claim 1, which is characterized in that in the filter circuit, detection signal via the 8th resistance and 3rd resistor inputs the reverse input end of the first operational amplifier；The reverse input end of first operational amplifier is via the 4th capacitor It is connected to its output end；The noninverting input of first operational amplifier is grounded；The output end of first operational amplifier respectively via 4th resistance and the second capacity earth are connected to the reversed input of the 6th operational amplifier via second resistance and first resistor End；The reverse input end of 6th operational amplifier is via the 6th capacitance connection to its output end；6th operational amplifier it is in the same direction Input end grounding；The output end of 6th operational amplifier is connected to peak value respectively via the 6th resistance and third capacity earth Detecting circuit.

8. according to claim 1 to any one of 7 described devices, which is characterized in that the ADC is using ADS807 chip come real Existing, FPGA uses A3P060/125 chip, and CPU uses STM32F407 processor chips.

9. according to claim 1 to any one of 7 described devices, which is characterized in that the communication module using WIFI, GPRS, One or more of CDMA, WCDMA, EVDO, 3G, 4G mobile radio telecommunications module, and utilize public radio communication network Carry out data remote transmission.

10. according to claim 1 to any one of 7 described devices, which is characterized in that the filter circuit is set as low-frequency range Tri- bandpass filtering structures of 500MHz-700MHz, high band 1.1GHz-1.3GHz, full frequency band 300MHz-1.5GHz；Or

Filter circuit is set as the bandpass filtering structure of 10KHz, 20KHz, 30KHz high pass and the combination of 100KHz, 200KHz low pass； Or

Filter circuit is set as the bandpass filtering structure of 1MHz-100MHz；Or

Filter circuit is set as tri- bandpass filtering structures of 1MHz-30MHz, 1MHz-5MHz, 5MHz-10MHz.