CN101644737A - Positioning device and positioning method for fault detection of local discharge - Google Patents
Positioning device and positioning method for fault detection of local discharge Download PDFInfo
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Abstract
The invention discloses a positioning device and a positioning method for fault detection of local discharge, and the positioning device comprises two sensors, a local discharge detection positionfinder and a computer, wherein, the two sensors consist of an electromagnetic sensor and a resonant ultrasonic sensor; the local discharge detection positionfinder is internally provided with double-signal paths in parallel; the positioning device also comprises a data acquisition card and a liquid crystal display (LCD) which are connected with the output ends of the double-signal paths; one path of the double-signal paths is an electromagnetic path connected with a peripheral electromagnetic sensor, while the other path thereof is an ultrasonic channel connected with a peripheral resonant ultrasonic sensor; one path is displayed by the LCD connected with the acquisition card, and the other path is sent to a peripheral computer through data wires after signal received by the electromagnetic path and the ultrasonic path is processed by the acquisition card. The test method is simple and flexible, has easy operation and strong anti-interference performance, overcomes the defect of single detection method for local discharge in the prior art, and can realize accurate detection and position on local discharge fault points in power equipment.
Description
Technical field
The present invention relates to a kind of fault detection of local discharge locating device and localization method, specifically is a kind of fault detection of local discharge locating device and localization method that is used for power equipment, belongs to power equipment fault detection of local discharge field of locating technology.
Background technology
At present, known Partial discharge detector is in series by sensor, amplifier, wave filter, signal collecting device and computing machine, by electric signal or the non-electrical signal that receives local discharge generation, the signal that receives is carried out filtering to be amplified, be transferred at last and carry out analyzing and processing on the computing machine, thereby finish the detection of shelf depreciation and determining of partial discharge position.
Because the shelf depreciation in the power equipment produces various signal, wherein has electric signal that non-electrical signal is also arranged, therefore aspect sensor, be divided into electric class and non-electric class two parts.More common the having of electricity class part: sieve formula coil pickoff, electromagnetic sensor etc.; In common the having of non-electrical sensor part: resonant vibration type supersonic sensor, gas sensor, optical signal sensor etc.Poor anti jamming capability is the ubiquitous problem of present Partial Discharge Detection, especially having under the complex environment of multiple ground unrest, existing shelf depreciation equipment all can not detect accurately and locatees discharge fault, the partial discharges fault that causes taking place can not get in time handling and repairing the serious normal life that also can have influence on the safety and production and the people.
Summary of the invention
In order to solve the poor anti jamming capability of fault detection of local discharge in the above-mentioned prior art, accurate location defect, the object of the present invention is to provide a kind of antijamming capability that improves, and the fault detection of local discharge locating device that can accurately locate, also provide simultaneously and utilized the localization method of detection and location device of the present invention partial discharges fault.
To achieve these goals, the present invention adopts following technical scheme: a kind of fault detection of local discharge locating device comprises the sensor, Partial Discharge Detection orientator and the computing machine that connect successively; Its characteristics are:
Described sensor is provided with 2, is respectively electromagnetic sensor and resonant vibration type supersonic sensor;
Parallel connection is provided with the dual signal passage and joins with the dual signal channel output end in the described Partial Discharge Detection orientator a data collecting card and a LCDs; Signalling channel in the dual signal passage is the electromagnetism passage, comprises input interface, detecting circuit and first differential amplifier that series connection is provided with; Wherein, input interface is described electromagnetic sensor interface, and the output terminal of first differential amplifier is connected with first input interface of described data collector;
Another signalling channel is ultrasonic passage, comprises input interface, charge preamplifier, arrowband bandwidth-limited circuit and second differential amplifier that series connection is provided with; Wherein, input interface is described resonant vibration type supersonic sensor interface, and the output terminal of second differential amplifier circuit is connected with second input interface of described data collector;
Described data collecting card collects the information that above-mentioned dual signal passage receives, and after treatment, divides two tunnel outputs; One the tunnel is sent to LCDs shows that another road is delivered to by data line carries out data processing in the peripheral hardware main frame.
Above-mentioned electromagnetic sensor be in ultra-high frequency antenna or the High Frequency Current Sensor any, wherein, ultra-high frequency antenna is the miniaturized narrowband antenna, frequency range is 350MHz～500MHz; High Frequency Current Sensor is the high-frequency narrow-band Rogowski coil, and its frequency range is 10MHz～30MHz; The detecting circuit frequency that is connected with this electromagnetic sensor is 10MHz～500MHz, this detecting circuit comprises high frequency detector diode and electric capacity, electric capacity and high frequency detector diode also connect the back and join with first differential amplifier, unidirectional conduction by the high frequency detector diode, make the electric capacity charge and discharge, utilize the mistiming of electric capacity charge and discharge, extract the enveloping curve of ultrahigh frequency or high-frequency signal.
Above-mentioned resonant vibration type supersonic wave sensor be in acoustic emission type resonant vibration type supersonic wave sensor or the vibration contact-type resonant vibration type supersonic wave sensor any, its resonance frequency is 40kHz; Described charge preamplifier enlargement factor is 100 times; Described narrow band filter centre frequency is 40kHz, frequency band range 38kHz-42kHz.
The first above-mentioned differential amplifier and the enlargement factor of second differential amplifier are 1000 times.
To achieve these goals, the present invention also provides a kind of localization method that utilizes above-mentioned fault detection of local discharge locating device, and it is as follows that the method comprising the steps of:
1) resonant vibration type supersonic sensor and electromagnetic sensor are plugged into 2 input interfaces of Partial Discharge Detection orientator respectively; And, receive the jump signal of the partial discharges fault that takes place in this search coverage with the probe of this electromagnetic sensor or resonant vibration type supersonic sensor interception zone to be measured respectively;
2) electromagnetic signal that receives by step 1) electromagnetic sensor and/or resonant vibration type supersonic sensor and/or the ultrasonic signal signalling channel by separately respectively, wherein, electromagnetic signal is converted into electric signal through detecting circuit, first differential amplifier after amplifying, and is collected by described data collecting card; Ultrasonic signal is converted into electric signal after charge preamplifier, arrowband bandwidth-limited circuit and second differential amplifier amplify, collected by described data collecting card;
3) step 2) signal of described data collecting card collection is a synchronous acquisition; Its signal divides 2 tunnel outputs after the high-speed dsp digital signal processor carries out data-switching and handles; One the tunnel is sent to LCDs shows the waveforms amplitude of this shelf depreciation and the distance of the described Partial Discharge Detection orientator of this trouble spot distance, simultaneously, utilize the mistiming of electromagnetic signal and ultrasonic signal reception and the product of ultrasonic signal velocity of propagation in medium, determine the distance between this partial discharge fault source and resonant vibration type supersonic sensor and/or the electromagnetic sensor, shelf depreciation is positioned; Another road is carried out secondary analysis and is handled in data line transfers to main frame.
Above-mentioned steps 1), step 2) described electromagnetic sensor can select in ultra-high frequency antenna or the High Frequency Current Sensor any for use, wherein, ultra-high frequency antenna is the miniaturized narrowband antenna, frequency range is 350MHz～500MHz; High Frequency Current Sensor is the high-frequency narrow-band Rogowski coil, and its frequency range is 10MHz～30MHz; Described detecting circuit frequency is 10MHz～500MHz; This detecting circuit adopts the high frequency detector diode, and the unidirectional conduction by the high frequency detector diode makes capacitor charge and discharge, utilizes the mistiming that the electric capacity charging is fast, discharge is slow, extracts the enveloping curve of ultrahigh frequency or high-frequency signal; Described resonant vibration type supersonic wave sensor be the acoustic emission type or the vibration contact-type in any, its resonance frequency is 40kHz; Described charge preamplifier enlargement factor is 100 times; Described narrow band filter centre frequency is 40kHz, frequency band range 38kHz-42kHz;
The first above-mentioned differential amplifier and the enlargement factor of described second differential amplifier are 1000 times.
Used electromagnetic sensor and/or resonant vibration type supersonic sensor among the present invention represents that both can use simultaneously, also can use separately.And electromagnetic sensor is selected for use any select for use with the resonant mode sonac any different array modes can be arranged, the different power equipments partial discharges fault different with power equipment detected and locatees; Described regional maximum magnitude to be measured is 10 meters.
As: electromagnetic sensor is selected small-sized narrow-band antenna for use, the resonant vibration type supersonic sensor is selected acoustic emission type resonant vibration type supersonic wave sensor for use, two sensor combinations are inserted above-mentioned fault detection of local discharge orientator input interface, can be used for the power equipment pole line is carried out along air corona discharge fault and insulator the detection and location of partial discharges fault.
And for example: electromagnetic sensor is selected small-sized narrow-band antenna for use, the resonant vibration type supersonic sensor is selected vibration contact-type resonant vibration type supersonic wave sensor for use, two sensor combinations are inserted above-mentioned Partial Discharge Detection orientator input interface, can be used for buried cable is carried out the detection and location of partial discharges fault.
For another example: electromagnetic sensor is selected miniaturized narrowband antenna or Rogowski coil for use; The resonant vibration type supersonic sensor is selected vibration contact-type resonant vibration type supersonic wave sensor for use, one of them inserts above-mentioned Partial Discharge Detection orientator with vibration contact-type resonance ultrasonic sensor combinations with miniaturized narrowband antenna or Rogowski coil, can be used for gas-insulated switch composite set or transformer are carried out the detection and location of partial discharges fault.
Adopt technical scheme of the present invention, its beneficial effect is as follows: the present invention adopts mode that the ultrasonic and electromagnetism super high frequency technique of resonance combines to power equipment inside or the shelf depreciation point detects and accurate location, has only overcome in the present Partial Discharge Detecting Technology with acoustic emission or the defectives such as inaccurate, easy omission that only detect with single means such as ultrahigh frequencies.By signals collecting, the application of operation keyboard triggering mode by Partial discharge detector flexibly of the electromagnetic sensor array mode different and data collecting card, improved the antijamming capability of power equipment Partial Discharge Detection location under the varying environment with the resonant vibration type supersonic sensor; As on-the-spot electromagnetic interference (EMI) when strong, adopt the pattern of resonant vibration type supersonic sensor and Partial discharge detector's combination triggering; When noise such as on-the-spot mechanical vibration were strong, the pattern that adopts the combination of electromagnetic sensor and Partial discharge detector to trigger detected the partial discharges fault point that produces in the power equipment and locatees.Simultaneously can also be according to the detection of electromagnetic sensor and/or resonant vibration type supersonic sensor, distance to its shelf depreciation point is gathered, when finding have partial discharges fault to take place, can determine the distance of this partial discharges fault point and Partial discharge detector, in time this partial discharges fault point be handled and repaired.Its detection mode is flexible, is convenient to operation, can satisfy the requirement of power equipment Partial Discharge Detection.
Description of drawings
Fig. 1 is the theory diagram of fault detection of local discharge locating device of the present invention
Fig. 2 is the structural representation of the present invention's assembling
Fig. 3 is the structural arrangements synoptic diagram of Partial Discharge Detection orientator panel among Fig. 2
Fig. 4 is the display graphics of Partial Discharge Detection orientator LCDs duty among Fig. 2
Fig. 5 is the detection and location synoptic diagram of example 1 of the present invention
Fig. 6 is the detection and location synoptic diagram of example 2 of the present invention
Fig. 7 is the detection and location synoptic diagram of example 3 of the present invention
Embodiment
As shown in Figure 1 and Figure 2, fault detection of local discharge locating device of the present invention comprises sensor, Partial Discharge Detection orientator and the computing machine 13 that connects successively; Sensor is provided with 2, is respectively electromagnetic sensor 1 and resonant vibration type supersonic sensor 5; The Partial Discharge Detection orientator is arranged in the cabinet of an aluminium alloy, parallel connection is provided with the dual signal passage in it, electromagnetic sensor 1 and resonant vibration type supersonic sensor 5 respectively by shielded cable 2,2 ' with the input interface grafting of the dual signal passage of Partial discharge detector;
First signalling channel in the dual signal passage is the electromagnetism passage, comprises input interface, detecting circuit 4 and first differential amplifier 3 that series connection is provided with; Wherein, input interface is the interface of electromagnetic sensor 1, and the output terminal of first differential amplifier 3 is connected with first input interface of data collecting card 6;
Another signalling channel is ultrasonic passage, comprises input interface, prime amplifier 12 that series connection is provided with; The arrowband bandwidth-limited circuit 7 and second differential amplifier 8; Wherein, input interface is the interface of described resonant vibration type supersonic sensor 5, and the output terminal of second differential amplifier circuit 8 is connected with second input interface of data collecting card 6;
The 220V AC power is by being fixed on socket A on the aluminium alloy cabinet and introducing and being connected with charhing unit B, and lithium battery C inserts in the charhing unit B, and level conversion unit D links to each other with lithium battery B, and level conversion unit D is that capture card is powered.
Adopt locating device of the present invention,, comprise that step is as follows the method that partial discharges fault detects and locatees:
1) electromagnetic sensor 1 and resonant mode sonac 5 are plugged into 2 input interfaces of Partial Discharge Detection orientator respectively; And, receive the jump signal of the partial discharges fault that takes place in this search coverage with the probe of this electromagnetic sensor 1 or resonant mode resonant vibration type supersonic sensor 5 interception zone to be measured respectively;
2) electromagnetic signal that receives through electromagnetic sensor 1 and/or resonant vibration type supersonic sensor 5 and/or ultrasonic signal are separately converted to electric signal and send into separately signalling channel, wherein, electromagnetic signal is collected by described data collecting card after detecting circuit 4, first differential amplifier 3 amplify; Ultrasonic signal is collected by described data collecting card 6 after charge preamplifier 12, arrowband bandwidth-limited circuit 7 and second differential amplifier 8 amplify;
3) step 2) signal of described data collecting card collection 6 is a synchronous acquisition; Its signal divides 2 tunnel outputs after the high-speed dsp digital signal processor carries out data-switching and handles; One the tunnel is sent to LCDs 10 on the Partial Discharge Detection orientator panel shows the waveforms amplitude of these shelf depreciations and this trouble spot distance apart from the Partial Discharge Detection orientator; Simultaneously, utilize the mistiming of electromagnetic signal and ultrasonic signal reception and the product of ultrasonic signal velocity of propagation in medium, determine the distance between this partial discharge fault source and electromagnetic sensor 1 and/or the resonant vibration type supersonic sensor 5, shelf depreciation is positioned; Another road is carried out secondary analysis and is handled in data line transfers to computing machine 13 main frames.
Above-mentioned steps 1), step 2) described electromagnetic sensor 1 can select in ultra-high frequency antenna or the High Frequency Current Sensor any for use, wherein, ultra-high frequency antenna is the miniaturized narrowband antenna, frequency range is 350MHz～500MHz; High Frequency Current Sensor is the high-frequency narrow-band Rogowski coil, and its frequency range is 10MHz～30MHz; Described detecting circuit frequency is 10MHz～500MHz; This detecting circuit 4 adopts the high frequency detector diode, and the unidirectional conduction by the high frequency detector diode makes capacitor charge and discharge, utilizes the mistiming of capacitor charge and discharge, extracts the enveloping curve of ultrahigh frequency or high-frequency signal; Described resonant vibration type supersonic wave sensor be the acoustic emission type or the vibration contact-type in any, its resonance frequency is 40kHz; Described charge preamplifier 12 enlargement factors are 100 times; Described narrow band filter 7 centre frequencies are 40kHz, frequency band range 38kHz-42kHz; The enlargement factor of described first differential amplifier 3 and described second differential amplifier 8 is 1000 times.
Send into Partial discharge detector when electromagnetic signal is converted into electric signal by electromagnetic sensor 1 through shielded cable 2, pass in the detecting circuit 4 that comprises detector diode and electric capacity composition, extract the envelope waveform of electromagnetic signal; Its feeble signal is collected by data collecting card 6 after amplifying through 1000 times first differential amplifier 3.
Ultrasonic signal is converted into electric signal by resonant vibration type supersonic sensor 5 simultaneously, send into Partial discharge detector through shielded cable 2 ', after 100 times charge preamplifiers 12 amplify, sending into centre frequency is the arrowband bandwidth-limited circuit 7 filterings part interference of 40kHz, the feeble signal of output is collected by data collecting card 6 after amplifying through 1000 times second differential amplifier 8.
Electromagnetic sensor in the said method and/or resonant vibration type supersonic sensor represent that both can use simultaneously, also can use separately.And electromagnetic sensor is selected for use any select for use with the resonant mode sonac any different array modes can be arranged, the different power equipments partial discharges fault different with power equipment detected and locatees; Described zone to be measured is set in 10 meters scopes.
The used resonant vibration type supersonic sensor 5 of the present invention is the SR-40 acoustic emission formula sensor or the Weir AW8R40-160C01 of the Audi vibration contact type sensor of Beijing good reputation science and technology; Electromagnetic sensor 1 adopts normal direction mould spiral antenna, and this normal direction mould spiral antenna is the commercially available prod; Narrow band filter adopts the U.S.'s U.S. letter MAX275 of company chip to make up; Prime amplifier 12 can adopt the PAI broad band amplifier of the industrial production of Beijing good reputation, and first differential amplifier 3 and second differential amplifier 8 be the general differential amplifier for being made up of discrete component all; The model that data collecting card 6 adopts the bright China of Beijing star wound Science and Technology Ltd. to produce is the data collecting card of FCFR-USB9825; The detector diode model of using in the detecting circuit 4 is SMS7630-079, and electric capacity adopts 1pf electric capacity; The principle of detecting circuit 4 is unidirectional conductions of utilization detector diode, allows capacitor charge and discharge, is far smaller than discharge time by the duration of charging, thereby extracts the ultra-high frequency signal enveloping curve, exports LCDs 10 to after data collecting card 6 is handled; The commercially available universal product of this display screen all can use, and display screen 10 used in the present embodiment is the display screen of VTK6488-5.7 for the model that shows Science and Technology Ltd.'s product in the Wuhan.
As shown in Figure 3, be the guidance panel of the used Partial discharge detector of the present invention, wherein, comprise button 17, LCDs 10, resonant vibration type supersonic sensor socket 15, electromagnetic sensor socket 11, work display lamp 16, charging display lamp 16 '; Wherein, button 17 is multiple feature operation keyboard 17.
As shown in Figure 4, be the show state of LCDs 10, this screen is divided into 2 panel region, and 1 is electromagnetism zone 101, and it shows the electromagnetic signal that is collected; Another sheet is ultrasonic regional 102, the ultrasonic signal that its demonstration collects, and the below of screen is respectively a distance display 103, activation threshold value 105, software version number, battery electric quantity indication 106 and maximal value 107.Wherein, the current measuring distance of distance display 103 expressions, the enlargement factor of the ultrasonic passage of ultrasonic 108 representatives, electromagnetism 104 is represented the enlargement factor of electromagnetism passage, times magnification numerical value can select 1,10,100 and 1000, regulates by the ultrasonic button in button operation district and the key up and down of electromagnetism button.
Above-mentioned activation threshold value 105 is triggering level and the threshold values that are used for being provided with capture card inside, after the level of input signal surpasses triggering level, signal is gathered.Threshold value is mainly used to search the starting point of ultrasonic signal: as the electromagnetism trigger mode is as triggering mode with electromagnetism, an electromagnetism triggering level and threshold value are set, in case being higher than this triggering level, the signal amplitude that capture card is received just produces a triggering, gather a shelf depreciation waveform, detect local discharge signal, search ultrasonic signal according to the size of threshold value simultaneously; Ultrasonic trigger mode is as triggering mode with ultrasonic, a ultrasonic activation threshold value is set, be higher than this triggering level and just produce a triggering in case capture card samples signal amplitude, gather a shelf depreciation waveform, detect local discharge signal, search ultrasonic signal according to the size of threshold value simultaneously; The maximal value of the current ultrasonic signal of maximum 107 expressions among the figure.Electromagnetism zone 101 and ultrasonic regional 102 shown oscillograms are a local discharge signal that collects among the figure.
Aspect anti-interference, that ultrasonic passage adopts is centre frequency 40kHz, bandwidth is narrow band filter 7 and 100 times charge preamplifier 12 and 1000 times second differential amplifier 8 of 38kHz～42kHz, thereby make noise greatly decay before and after 40kHz, and then can reduce to disturb; What adopt in electromagnetic signal is arrowband miniature antenna or arrowband Rogowski coil, and detecting circuit is used for reducing by first differential amplifier of sampling rate and 1000 times.
Under the more intense situation of electromagnetic interference (EMI), when detecting shelf depreciation, adopt the pattern of ultrasonic triggering, can detect the trouble spot of shelf depreciation exactly by ultrasonic trigger mode; Under the situation that the noise that causes because of mechanical vibration is stronger, can adopt the electromagnetism trigger mode to realize the accurate detection and the location of its partial discharges fault at the scene.
Ultrasonic trigger mode be with ultrasonic signal as the triggering source, preset a trigger voltage in capture card inside, just produce a triggering in case the ultrasonic signal amplitude of input surpasses this trigger voltage, gather the waveform of a shelf depreciation, detect local discharge signal;
The ultrasonic trigger mode of electromagnetism trigger mode is as the triggering source with electromagnetic signal, preset a trigger voltage in capture card inside, just produce a triggering in case the electromagnetic signal amplitude of input surpasses this trigger voltage, gather the waveform of a shelf depreciation, detect local discharge signal;
The ultimate principle of fault detection of local discharge of the present invention location is: different according to sound, the electric signal propagation rate in medium, and because the propagation rate of electromagnetic wave signal is exceedingly fast, travel-time can ignore, therefore can be by measuring ultrasonic, the mistiming of ultra-high frequency signal from the signal source to the sensor, then with, electric signal mistiming (Δ t) of in medium, propagating and ultrasonic signal in medium velocity of propagation (product v) calculates the position distance of shelf depreciation.Its computing formula is L=Δ t*v, and then the L office of being puts a little to the distance of having children outside the state plan sensor.
Below by example technical solution of the present invention is described in further detail the fault detection of local discharge of electric equipment under varying environment location.
Example 1
As Fig. 2, shown in Figure 5, there is defective 23 in the gas-insulated switch 22 of ground connection 20, thereby produced shelf depreciation.By Partial Discharge Detection orientator 14, vibration contact-type resonant vibration type supersonic wave sensor 25 associating miniaturized narrowband antennas 21 have been adopted.Mobile resonant vibration type supersonic sensor 25, moving range is at 1m
2By observing the ultrasonic signal amplitude variation that Partial Discharge Detection orientator 14 shows, resonant vibration type supersonic sensor 25 moves up and down, as find near certain point away from the time ultrasonic signal amplitude diminish, near the time ultrasonic signal amplitude increase, illustrate to have shelf depreciation.The maximum distance simultaneously of signal amplitude that shows at Partial Discharge Detection orientator 14 hour is stopped, and this moment, detected position was exactly shelf depreciation position more accurately.
Electromagnetic sensor wherein also can adopt Rogowski coil; Vibration contact-type resonant vibration type supersonic wave sensor 25 is united resonant vibration type supersonic sensor socket 15 and the electromagnetic sensor socket 11 that Rogowski coils insert Partial Discharge Detection orientator 14 respectively simultaneously, transformer is carried out the detection and location of partial discharges fault.
As Fig. 2, shown in Figure 6, there is individual trouble spot 33 to have discharge fault to take place in the buried cable 30, adopt the combination of resonant mode contact-type ultrasonic sensor 31 and small-sized narrow-band antenna 35, resonant mode contact-type ultrasonic sensor 31 and small-sized narrow-band antenna 35 are inserted the resonant vibration type supersonic sensor socket 15 and the electromagnetic sensor socket 11 of Partial Discharge Detection orientator 14 respectively simultaneously, buried cable 30 is carried out the detection and location of partial discharges fault.To vibrate contact-type resonant vibration type supersonic wave sensor 31 earlier is put on the face of land 32, cooperate small-sized narrow-band antenna 35, operator 18 is by operation Partial Discharge Detection orientator 14, move resonant vibration type supersonic sensor 31 along the cable direction, as find near certain point away from the time ultrasonic signal amplitude diminish, near the time ultrasonic signal amplitude increase, illustrate to have shelf depreciation.By observing the amplitude of the ultrasonic signal that Partial Discharge Detection orientator 14 shows, reach maximum at signal amplitude, distance reaches hour, and be exactly position more accurately, buried cable trouble spot 33 this moment under the face of land.
As Fig. 2, shown in Figure 7, overhead transmission line 46 and 47 are arranged in the shaft tower 40, wherein on the circuit 46 corona discharge in the air is arranged, adopt the array mode of acoustic emission type resonant vibration type supersonic wave sensor 41 and small-sized narrow-band antenna 45, the pole line of power equipment is carried out the detection and location of partial discharges fault along air corona discharge fault and insulator.During detection, earlier acoustic emission type resonant vibration type supersonic wave sensor 41 and small-sized narrow-band antenna 45 are inserted simultaneously the resonant vibration type supersonic sensor socket 15 and the electromagnetic sensor socket 11 of Partial Discharge Detection orientator 14 respectively, operator 18 is by mobile Partial Discharge Detection orientator 14, can see that the local discharge signal amplitude that shows on it changes along with the variation of distance, as finding near certain zone, away from the time ultrasonic signal amplitude diminish, near the time ultrasonic signal amplitude increase, may exist in air corona discharge 48 on the immediate overhead transmission line this moment.
Claims (10)
1, a kind of fault detection of local discharge locating device comprises the sensor, Partial Discharge Detection orientator and the computing machine that connect successively; It is characterized in that:
Described sensor is provided with 2, is respectively electromagnetic sensor and resonant vibration type supersonic sensor;
Parallel connection is provided with the dual signal passage and joins with the dual signal channel output end in the described Partial Discharge Detection orientator a data collecting card and a LCDs; Signalling channel in the dual signal passage is the electromagnetism passage, comprises input interface, detecting circuit and first differential amplifier that series connection is provided with; Wherein, input interface is described electromagnetic sensor interface, and the output terminal of first differential amplifier is connected with first input interface of described data collector;
Another signalling channel is ultrasonic passage, comprises input interface, charge preamplifier, arrowband bandwidth-limited circuit and second differential amplifier that series connection is provided with; Wherein, input interface is described resonant vibration type supersonic sensor interface, and the output terminal of second differential amplifier circuit is connected with second input interface of described data collector;
Described data collecting card collects the information that described dual signal passage receives, and after treatment, the one tunnel is sent to described LCDs shows that another road is delivered to described computing machine by data line and carries out data processing.
2, fault detection of local discharge locating device as claimed in claim 1, it is characterized in that: described electromagnetic sensor be in ultra-high frequency antenna or the High Frequency Current Sensor any, wherein, ultra-high frequency antenna is the miniaturized narrowband antenna, and frequency range is 350MHz～500MHz; High Frequency Current Sensor is the high-frequency narrow-band Rogowski coil, and its frequency range is 10MHz～30MHz; Described detecting circuit frequency is 10MHz～500MHz, and this detecting circuit comprises the connected electric capacity of high frequency detector diode.
3, fault detection of local discharge locating device as claimed in claim 1, it is characterized in that: described resonant vibration type supersonic wave sensor be in acoustic emission type resonant vibration type supersonic wave sensor or the vibration contact-type resonant vibration type supersonic wave sensor any, its resonance frequency is 40kHz; Described charge preamplifier enlargement factor is 100 times; Described narrow band filter centre frequency is 40kHz, frequency band range 38kHz-42kHz.
4, as the arbitrary described fault detection of local discharge locating device of claim 1-3, it is characterized in that: the enlargement factor of described first differential amplifier and second differential amplifier is 1000 times.
5, the described detection and location device of a kind of claim 1 is characterized in that the localization method of partial discharges fault: comprise that step is as follows:
1) resonant vibration type supersonic sensor and electromagnetic sensor are plugged into 2 input interfaces of Partial Discharge Detection orientator respectively; And, receive the jump signal of the partial discharges fault of generation this zone to be measured in the probe of this electromagnetic sensor or resonant vibration type supersonic sensor interception zone to be measured respectively;
2) jump signal of step 1) is separately converted to electric signal after electromagnetic sensor and/or the reception of resonant vibration type supersonic sensor, after separately signalling channel detection or filtering, after 1000 times differential amplifiers amplify, arrived by described data collecting card synchronous acquisition respectively;
3) after step 2) the high-speed dsp digital signal processor of establishing in the described data collecting card of the signal that collects carries out data-switching and processing, divide 2 tunnel outputs; One the tunnel is sent to LCDs shows the waveforms amplitude of this shelf depreciation and the distance of the described Partial Discharge Detection orientator of this trouble spot distance, and according to the mistiming of electromagnetic signal and ultrasonic signal reception and the product calculating of ultrasonic signal velocity of propagation in medium, determine the distance between this partial discharge fault source and resonant vibration type supersonic sensor and/or the electromagnetic sensor, shelf depreciation is positioned; Another road is carried out secondary analysis and is handled in data line transfers to main frame.
6, localization method as claimed in claim 5 is characterized in that: the described electromagnetic sensor of step 1) be in ultra-high frequency antenna or the High Frequency Current Sensor any, wherein, ultra-high frequency antenna is the miniaturized narrowband antenna, frequency range is 350MHz～500MHz; High Frequency Current Sensor is the high-frequency narrow-band Rogowski coil, and its frequency range is 10MHz～30MHz; Described detecting circuit frequency is 10MHz～500MHz, and this detecting circuit adopts the high frequency detector diode, and the unidirectional conduction by the high frequency detector diode makes capacitor charge and discharge, utilizes the mistiming that discharges and recharges, and extracts the enveloping curve of ultrahigh frequency or high-frequency signal; Described resonant vibration type supersonic wave sensor be the acoustic emission type or the vibration contact-type in any, its resonance frequency is 40kHz; Described charge preamplifier enlargement factor is 100 times; Described narrow band filter centre frequency is 40kHz, frequency band range 38kHz-42kHz.
7, localization method as claimed in claim 6, it is characterized in that: any in any in the described electromagnetic sensor and the described resonant vibration type supersonic sensor is combination in any, and the different partial discharges fault that power equipment produced is detected and locatees; Described zone to be measured is 10 meters to the maximum.
8, localization method as claimed in claim 7, it is characterized in that: described electromagnetic sensor is small-sized narrow-band antenna, described resonant vibration type supersonic sensor is an acoustic emission type resonant vibration type supersonic wave sensor, this small-sized narrow-band antenna and acoustic emission type resonant vibration type supersonic sensor combinations insert described fault detection of local discharge orientator, the power equipment pole line are carried out the detection and location of partial discharges fault along air corona discharge fault and insulator.
9, localization method as claimed in claim 7, it is characterized in that: described electromagnetic sensor is small-sized narrow-band antenna, described resonant vibration type supersonic sensor is vibration contact-type resonant vibration type supersonic wave sensor, described small-sized narrow-band antenna and resonant mode contact-type group of ultrasonic sensors splice grafting are gone into described Partial Discharge Detection orientator, buried cable are carried out the detection and location of partial discharges fault.
10, localization method as claimed in claim 7 is characterized in that: described electromagnetic sensor is miniaturized narrowband antenna or Rogowski coil; Described resonant vibration type supersonic sensor is vibration contact-type resonant vibration type supersonic wave sensor, one of described miniaturized narrowband antenna or Rogowski coil insert described Partial Discharge Detection orientator with described vibration contact-type resonance ultrasonic sensor combinations, and gas-insulated switch composite set or transformer are carried out the detection and location of partial discharges fault.
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2009
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