CN103823157A - GPS synchronous timing-based XLPE cable partial discharge positioning device - Google Patents
GPS synchronous timing-based XLPE cable partial discharge positioning device Download PDFInfo
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- CN103823157A CN103823157A CN201410052471.7A CN201410052471A CN103823157A CN 103823157 A CN103823157 A CN 103823157A CN 201410052471 A CN201410052471 A CN 201410052471A CN 103823157 A CN103823157 A CN 103823157A
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Abstract
A GPS synchronous timing-based XLPE cable partial discharge positioning device is provided. The GPS synchronous timing-based XLPE cable partial discharge positioning device includes a first high-frequency sensor, a second high-frequency sensor, an XLPE cable partial discharge detection positioning host, an XLPE cable partial discharge detection positioning slave and an upper computer. According to the GPS synchronous timing-based XLPE cable partial discharge positioning device of the invention, a single positioning device is divided into two sets of apparatuses which respectively detect high-frequency current signals of cable connector grounding lines at two ends of one XLPE cable, wherein one apparatus is adopted as the detection host, and the other apparatus is adopted as the detection slave; and the host and slave can realize synchronous acquisition through GPS timing synchronization, and therefore, precise time difference of the same pulse can be obtained, and a partial discharge power source can be precisely positioned.
Description
Technical field
The present invention relates to shelf depreciation field of locating technology, specifically a kind of shelf depreciation locating device based on the synchronous time service of GPS for crosslinked polyethylene (XLPE) cable.
Background technology
Crosslinked polyethylene (XLPE) cable is widely used in the main electrical network in city.While making due to XLPE cable, starting material are impure, or due to the problem of manufacture craft, insulation course may exist air gap, impurity or protrusion, exists the position of air gap and protrusion very easily to send shelf depreciation at these; XLPE cable running environment is more severe in addition, and its insulating material is easy to receive erosion, under the effect of shelf depreciation, can aggravate the aging of insulating material, finally causes major insulation to puncture and breaks down.Therefore detect and locate XLPE cable shelf depreciation, for finding early potential faults, improve grid stability and reliability and be of great importance.
The detection of shelf depreciation mainly contains pulse current method, superfrequency detection method, high-frequency current detection method, supersonic testing method etc.The wherein inapplicable and Site Detection of pulse current, ultrahigh-frequency signal and ultrasonic signal attenuation ratio in cable is more serious, therefore conventionally uses high-frequency current detection method for XLPE cable Partial Discharge Detection.The high-frequency current signal that shelf depreciation produces can be propagated to two ends along cable from shelf depreciation origination point, high-frequency current detection method is used High Frequency Current Sensor (HFCT) to be connected on the ground wire of cable splice conventionally, detects whether there is shelf depreciation generation by the high-frequency current detecting on ground wire.
Current existing XLPE cable shelf depreciation location technology mainly contains two kinds, and one is acoustoelectric combined detection method, and one is wave of oscillation detection method.Acoustoelectric combined detection method adopts supersonic testing method and two kinds of detection methods of high-frequency current detection method simultaneously, utilize high-frequency current signal different with ultrasonic signal velocity of propagation in XLPE cable, can determine the direction that local discharge signal transmits, as need are accurately located length consuming time, the complicated operation of position of shelf depreciation.Wave of oscillation detection method utilizes wave of oscillation signal generator to substitute the experiment power supply of power frequency, wave of oscillation voltage is injected in one end in XLPE cable, utilizing wave of oscillation voltage to cause defect produces shelf depreciation and locates partial discharge position, shortcoming is to need special wave of oscillation signal generator, and needs equipment to stop transport.
Summary of the invention
For the above-mentioned deficiency of traditional XLPE cable shelf depreciation location technology, the invention provides a kind of XLPE cable shelf depreciation locating device and localization method based on the synchronous time service of GPS, single locating device is divided into two, detect respectively a high-frequency current signal on the cable splice ground wire of XLPE cable two ends, one of them device is as detecting main frame, another one device is as detecting slave, main frame and slave are synchronously realized synchronous acquisition by GPS time service, thereby the precise time that obtains same pulse is poor, realize accurately location Partial Discharge Sources.
Technical solution of the present invention is as follows:
A kind of XLPE cable shelf depreciation locating device based on the synchronous time service of GPS, its feature is, comprises the first high frequency sensors, the second high frequency sensors, XLPE cable Partial Discharge Detection positioning host, XLPE cable Partial Discharge Detection location slave and host computer;
Described XLPE cable Partial Discharge Detection positioning host comprises holding circuit, high-frequency amplifier circuit, micro-control unit (MCU), gps clock module, wireless communication module, eeprom memory, LCDs and guidance panel, described holding circuit one end is connected with one end of the first described high frequency sensors, the other end of this holding circuit is connected with described high-frequency amplifier circuit, described MCU module respectively with described high-frequency amplifier circuit, gps clock module, wireless communication module, eeprom memory, LCDs, guidance panel connects, the described EEPROM storage other end is connected with described host computer through host computer interface,
Described XLPE cable Partial Discharge Detection location slave comprises holding circuit, high-frequency amplifier circuit, MCU, gps clock module, wireless communication module, eeprom memory, LCDs and guidance panel; described holding circuit one end is connected with one end of the second described high frequency sensors; the other end of this holding circuit is connected with described high-frequency amplifier circuit, and described MCU module is connected with described high-frequency amplifier circuit, gps clock module, wireless communication module, eeprom memory, LCDs, guidance panel respectively.
An XLPE cable partial discharge positioning method based on the synchronous time service of GPS, its feature is, the method comprises the steps:
1. one end of the first high frequency sensors and the second high frequency sensor is connected on respectively on the ground wire of cable under test two end connectors;
2. the other end of the first high frequency sensors and the second high frequency sensor is connected with XLPE cable Partial Discharge Detection location slave with XLPE cable Partial Discharge Detection positioning host respectively;
3. start system, after sending sense command, XLPE cable Partial Discharge Detection positioning host enters waiting status, XLPE cable Partial Discharge Detection location slave receives replys XLPE cable Partial Discharge Detection positioning host after sense command and acknowledges receipt of sense command, complete handshake procedure, then also start to wait for;
4. XLPE cable Partial Discharge Detection positioning host and XLPE cable Partial Discharge Detection location slave completes synchronous counting N PPS pulse after handshake procedure, then starts the pulse signal of synchronous acquisition cable under test two end connector ground wires;
5. XLPE cable Partial Discharge Detection positioning host gathers the pulse waveform data of cable under test one end;
6. the pulse waveform data of the XLPE cable Partial Discharge Detection location slave synchronous acquisition cable under test other end, and the timestamp information reading by pulse waveform data with from gps time module by MCU and wireless communication module is transferred to XLPE cable Partial Discharge Detection positioning host;
The wireless communication module of XLPE cable Partial Discharge Detection positioning host receives pulse waveform data and the timestamp information of the slave transmission of XLPE cable Partial Discharge Detection location, and is transferred to the MCU of XLPE cable Partial Discharge Detection positioning host;
7. the MCU of XLPE cable Partial Discharge Detection positioning host does correlation analysis to two groups of Wave datas, in the time that both waveforms are consistent, calculate the time difference and locates Partial Discharge Sources;
When both waveforms are during without consistent ripple, again send acquisition, repeating above said collection process, if repeat 10 times all without consistent waveform, judges that Partial Discharge Sources is not in this section of cable.
XLPE cable Partial Discharge Detection positioning host and slave are all made portable portable equipment, wherein all contain high speed acquisition equipment, the high-frequency current signal that can detect shelf depreciation and reach cable splice ground wire by connecting HFCT sensor, detects whether there is shelf depreciation with this.
XLPE cable Partial Discharge Detection positioning host and slave are all mainly made up of amplifying circuit, holding circuit, MCU, gps clock module, wireless communication module, eeprom memory, LCDs, guidance panel.The high-frequency current signal that amplifying circuit is responsible for the shelf depreciation gathering to produce amplifies; MCU module is analyzed collecting pulse data and its timestamp, wherein the MCU module of slave is responsible for the data that the collect function such as carry out that filtering, peak value of pulse are extracted, added timestamp, the MCU module of main frame is except being responsible for the analyzing and processing of the data that collect of the machine, and the data of being also responsible for slave to upload by wireless telecommunications are carried out the function such as waveform correlation analysis, mistiming calculating; Gps clock module is responsible for providing synchronizing pulse and the precise time stamp of synchronous acquisition; Wireless communication module is responsible for control command between slave and the transmission of Wave data; Eeprom memory is responsible for storing historical detection data, and can upload by data-interface; LCDs and guidance panel are responsible for providing man-machine interface.
XLPE cable Partial Discharge Detection location slave by the time service function synchro measure high-frequency current pulse of GPS, passes to XLPE cable Partial Discharge Detection positioning host by the pulse waveform data that record by the mode of wireless communication transmission and carries out further computing in the time carrying out shelf depreciation location.
XLPE cable Partial Discharge Detection positioning host informs that by wireless data communication XLPE cable Partial Discharge Detection location slave synchronously detects in the time carrying out shelf depreciation location, after the pulse waveform data that detect and time scale information are sent to main frame by slave, main frame (Wave data that adopts wavelet algorithm to detect slave and main frame carries out waveform correlation analysis) detects waveform correlativity and the time difference of this pulse data and data that the machine detects, and the cable length location partial discharge position arranging according to user, be presented in man-machine interface.All Partial Discharge Detection data can also be sent in host computer by data connector.
The Partial Discharge Detection data that host computer can storing X LPE cable local discharge detection and location main frame be uploaded, and provide user to inquire about data and graphical data shows, be convenient to follow-up analysis and research.
In system, use hardware filtering device and software filtering algorithm to remove the impact of disturbing pulse.
The key of XLPE cable shelf depreciation location is to measure local discharge signal, and to be delivered to the precise time of main frame and slave poor.Native system uses the synchronous time service of GPS to realize the synchro measure of main frame and slave, and GPS can export the square wave of a 1Hz, is called PPS ripple.This square wave via satellite signal carries out synchronously, and the error between distinct device between PPS ripple rising edge is minimum, below 1 μ s, corresponding to 0.018 ° in a power frequency period, is enough used as the signal of synchro measure.Can add timestamp waveform raw data in detection partial discharge pulse signal at main frame and slave in addition, this timestamp reads from GPS time service module, can guarantee the time synchronized between slave, guarantees the accuracy that the mistiming calculates.
Compared with acoustoelectric combined detection technique, the present invention is simple to operate in the time carrying out XLPE cable Partial Discharge Detection positioning operation, detection speed is fast, easy to use, compared with wave of oscillation detection method, the present invention without cable is had a power failure, and does not need extra signal generator in the time carrying out XLPE cable Partial Discharge Detection positioning operation, thereby reduce cost, be suitable for cable general survey work.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention is based on the shelf depreciation locating device of the synchronous time service of GPS.
Fig. 2 is the shelf depreciation locating device instrumentation plan that the present invention is based on the synchronous time service of GPS.
Fig. 3 is the structural drawing of XLPE cable Partial Discharge Detection positioning host.
Fig. 4 is the structural drawing of XLPE cable Partial Discharge Detection location slave.
Fig. 5 is the measurement sequential synchronous based on GPS.
Fig. 6 is measurement procedure figure.
Embodiment
Below in conjunction with accompanying drawing, XLPE cable Partial Discharge Detection positioning system of the present invention is elaborated: the present embodiment has provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment comprises: XLPE cable Partial Discharge Detection positioning host, XLPE cable Partial Discharge Detection location slave and host computer.XLPE cable Partial Discharge Detection positioning host and slave are all portable handheld devices, need to carry out XLPE cable Partial Discharge Detection location time, manually carry XLPE cable Partial Discharge Detection positioning host and slave respectively to the cable splice place, two ends of tested cable, the High Frequency Current Sensor of main frame and slave is connected on respectively on the ground wire of relevant position cable splice.By the synchronous time service of GPS and radio communication, jointly complete cable local discharge by XLPE cable Partial Discharge Detection positioning host and slave and detect and location.The data of storage can be transferred to host computer and be further analyzed.
As shown in Figure 3, XLPE cable Partial Discharge Detection positioning host comprises sensor, amplifying circuit, holding circuit, MCU, gps clock module, wireless communication module, storer, LCDs, guidance panel.Holding circuit one end is connected on sensor, and the other end is connected with amplifying circuit, and MCU module is connected with amplifying circuit, gps clock module, wireless communication module, storer, LCDs, guidance panel respectively.Sensor sleeve, on XLPE cable joint ground wire, will flow through pulsed current signal on XLPE cable joint ground wire and pass to holding circuit.Holding circuit is used for protecting device interior device and personal security, in case there is larger electric current on Measuring Time cable grounding line, causes device damage and injury to personnel.MCU module is accepted the control of guidance panel, sends communications command to wireless communication module, reads the timestamp information of gps clock module, result of calculation is presented in LCDs, and is stored in eeprom memory.The data that are stored in EEPROM can be uploaded to host computer by data-interface.
XLPE cable Partial Discharge Detection location slave passes through the pulse signal of the synchronization pulse synchronous acquisition XLPE cable other end cable splice ground wire of gps clock module in the time that main frame sends measuring command, the burst length stamp information exchange that pulse current data and MCU are read from gps clock module is crossed radio communication and is sent to main frame, and is stored in eeprom memory.
Measuring process as shown in Figure 6, enters waiting status after XLPE cable Partial Discharge Detection positioning host is sent sense command, and slave receives replys host acknowledgement after sense command and receive orders, and completes handshake procedure, then also starts to wait for.Main frame and slave be synchronous counting N PPS pulse from completing handshake procedure, then starts the synchronous acquisition pulse waveform data in 1 second.Slave is passed the pulse waveform data that detect and the timestamp information that reads from gps time module back XLPE cable Partial Discharge Detection positioning host, by main frame MCU module, two data is processed, and differs from computing time and locates Partial Discharge Sources.Main frame is by doing correlation analysis to Wave data, and waveform unanimously calculates the time difference, if automatically again send acquisition, repeating above said collection process without consistent waveform.If repeat 10 times all without consistent waveform, judge that Partial Discharge Sources is not in this section of cable.
The synchronous principle realizing of native system is as Fig. 5.The method realizing, for GPS module to be installed respectively on XLPE cable Partial Discharge Detection positioning host and slave, is used for obtaining synchronous clock signal.Need to carry out shelf depreciation location time, first wait for next PPS pulse by XLPE cable Partial Discharge Detection positioning host, when PPS pulse is arrived, with its rising edge trigger controller, slave is sent to sense command, and start the step-by-step counting to PPS from next PPS pulse.Slave is received after sense command, also starts the step-by-step counting to PPS from next PPS pulse, and in the time counting down to a predetermined value, slave just starts synchronous acquisition high-frequency current signal, gathers after the data of 1s, to data analysis processing.Slave is passed the data of collection back main frame by the mode of wireless transmission, by main frame, two data is processed, and obtains mistiming and positioning result and by data storage.
Claims (1)
1. the XLPE cable shelf depreciation locating device based on the synchronous time service of GPS, it is characterized in that, comprise the first high frequency sensors, the second high frequency sensors, XLPE cable Partial Discharge Detection positioning host, XLPE cable Partial Discharge Detection location slave and host computer;
Described XLPE cable Partial Discharge Detection positioning host comprises holding circuit, high-frequency amplifier circuit, MCU, gps clock module, wireless communication module, eeprom memory, LCDs and guidance panel, described holding circuit one end is connected with one end of the first described high frequency sensors, the other end of this holding circuit is connected with described high-frequency amplifier circuit, described MCU module respectively with described high-frequency amplifier circuit, gps clock module, wireless communication module, eeprom memory, LCDs, guidance panel connects, the described EEPROM storage other end is connected with described host computer through host computer interface,
Described XLPE cable Partial Discharge Detection location slave comprises holding circuit, high-frequency amplifier circuit, MCU, gps clock module, wireless communication module, eeprom memory, LCDs and guidance panel; described holding circuit one end is connected with one end of the second described high frequency sensors; the other end of this holding circuit is connected with described high-frequency amplifier circuit, and described MCU module is connected with described high-frequency amplifier circuit, gps clock module, wireless communication module, eeprom memory, LCDs, guidance panel respectively.
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Cited By (6)
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| CN104678266A (en) * | 2015-02-05 | 2015-06-03 | 国家电网公司 | Long-distance high-voltage cable partial discharge double-end positioning system and long-distance high-voltage cable partial discharge double-end positioning method |
| CN107478967A (en) * | 2017-08-03 | 2017-12-15 | 国网山东省电力公司济南供电公司 | Towards the 10KV cable local discharges on-line monitoring system and method for mobile fortune inspection |
| CN107544003A (en) * | 2016-06-28 | 2018-01-05 | 本德尔有限两合公司 | The method and alignment system of the insulation fault position on electric conductor for determining seabed supply lines |
| CN108226836A (en) * | 2016-12-31 | 2018-06-29 | 科大智能电气技术有限公司 | A kind of calibration method of fault detector synchronous waveform |
| CN109031073A (en) * | 2018-09-04 | 2018-12-18 | 苏州光格设备有限公司 | cable local discharge positioning device and method |
| CN109683068A (en) * | 2018-12-06 | 2019-04-26 | 国网江苏省电力有限公司扬州供电分公司 | A kind of cable synchronizing partial discharge testing system |
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| CN104678266A (en) * | 2015-02-05 | 2015-06-03 | 国家电网公司 | Long-distance high-voltage cable partial discharge double-end positioning system and long-distance high-voltage cable partial discharge double-end positioning method |
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| CN108226836A (en) * | 2016-12-31 | 2018-06-29 | 科大智能电气技术有限公司 | A kind of calibration method of fault detector synchronous waveform |
| CN108226836B (en) * | 2016-12-31 | 2021-06-01 | 科大智能电气技术有限公司 | Calibration method for waveform synchronization of fault indicator |
| CN107478967A (en) * | 2017-08-03 | 2017-12-15 | 国网山东省电力公司济南供电公司 | Towards the 10KV cable local discharges on-line monitoring system and method for mobile fortune inspection |
| CN109031073A (en) * | 2018-09-04 | 2018-12-18 | 苏州光格设备有限公司 | cable local discharge positioning device and method |
| CN109683068A (en) * | 2018-12-06 | 2019-04-26 | 国网江苏省电力有限公司扬州供电分公司 | A kind of cable synchronizing partial discharge testing system |
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