CN202383234U - Online positioning apparatus for partial discharge of high-voltage cable line - Google Patents

Abstract

The utility model provides an online positioning apparatus for partial discharge of a high-voltage cable line, comprising a high frequency broadband electromagnetic coupling sensor, which is muff-coupled on a three-phase cable accessory ground wire or an intersected interconnection wire to couple with a partial discharge signal; a set of lower computer data processing and collecting units, which is used for completing the synchronous triggering sampling of a three-phase cable accessory sensor signal and is provided with a signal preposition conditioning unit, an I/O control unit, a high-speed data collecting card and a photoelectric conversion module; and an upper computer monitoring unit, which is connected with the lower computer through an optical fiber transmission network, and used for controlling the lower computer to collect data and forming the time domain signal display of the partial discharge, the display of apparent discharge amount and the real time display of a discharge amount-discharge phase discharge spectrum, with an industry frequency voltage phase as a reference. The online positioning apparatus for a partial discharge of a high-voltage cable line has the advantage of performing distributed microsecond-level synchronous high speed sampling on the high-voltage cable line to realize the online positioning of the partial discharge according to on-site requirements.

Description

The online locating device of Voltage Cable Lines Construction shelf depreciation

Technical field

The utility model relates to a kind of cable machinery pick-up unit, and the device of the online location of particularly a kind of Voltage Cable Lines Construction shelf depreciation belongs to the power measurement technical field.

Background technology

At present, high pressure and ultra-high voltage cross-linking tygon (XLPE) power cable are in the application on power system steady-state growth, and its loop length annual average rate of increase surpasses 15%.High pressure, extra-high-tension cable circuit have occupied important status as the important step of urban electricity supply and main grid structure in China's urban distribution network.How realizing the state estimation and the repair based on condition of component of these cable lines, guarantee the cable line safe and reliable operation, is the focus of studying both at home and abroad at present.

Crosslinked cable is bad material or bad micropore, the impurity of causing of technology often; Technological reason causes semi-conductive layer to the most advanced and sophisticated projection of insulation course; Perhaps the on-the-spot installation of annex is improper causes the internal electric field distribution to distort, and all very easily produces shelf depreciation (PD, Partial discharge).Shelf depreciation is the main cause that causes insulation ag(e)ing as the bad main forms of cable line insulation status, is again the principal character parameter that characterizes insulation status.The partial discharge quantity of power cable and its insulation status are closely related, and the variation of partial discharge quantity is indicating that possibly there is the defective that endangers cable running safety in cable insulation.Therefore, the partial discharge quantity of accurately measuring cable be judge the cable insulation quality the most intuitively, effective method, but also be to receive external condition restriction, method that detection difficulty is bigger.Theoretical research shows that the frequency spectrum that XLPE cable partial discharge pulse comprises is very wide, can reach the GHz order of magnitude.The focus of having measured cable local discharge is both at home and abroad at present transferred to high frequency (3-30MHz) and ultrahigh frequency (300MHz-3GHz) direction.

Many Utilities Electric Co.s have used the high-tension cable online detector for partial discharge; But the in-site measurement effect is unsatisfactory; Do two big key problems (have or not an innings discharge signal? Is the source put from annex or body in office?) solved, erroneous judgement misjudgement situation happens occasionally. at allIts main cause is that extraneous strong electromagnetic source is a lot, and the local discharge signal amplitude is very little, is therefore very easily flooded by ground unrest, and the anti-interference method effect of the many software and hardware combining that adopt at present is undesirable.

At present, for the off-line testing that cable line has a power failure, can confirm preferably that office puts the source.And for the high-tension cable that send in the electricity, its external interference is complicated and changeable, and office's discharge signal amplitude is faint, and transmission speed fast (about 170 meters/microsecond), has obvious relaxation phenomenon, and how online detection and confirm that office puts the source is present research difficult point.

The bibliographical information of relevant this respect for example application number is the patent of invention of confirming the partial discharge site positioning system of abort situation in the high-tension cable by name of 99815427.X; The on-the-spot location of a kind of pulsed discharge (PDSL) system is provided; Do not requiring that oscillograph triggers under the condition of function the pulse on this system acquisition electric conductor.The PDSL system comprises pulsed discharge measurement (PDM) system, and through being programmed in the data of storage PDM system acquisition in the reference buffer, its size is corresponding to the travel-time of pulse along electric conductor length.The impulse smaple of scan capture is to locate the peak value of pulse on the selected noise level.These pulses are stored in the odd-job impact damper with the sample of selected number, and normalization is added in the reference buffer then.Reference buffer provides the statistical average of pulse activity.Because size and the cable length and the proportional relation in cable travel-time of reference buffer can be confirmed the distance between fault in-situ and the cable end piece.Yet the method for above-mentioned patent is that the after-applied signal that must cable cuts off the power supply positions, and does not need cable to have a power failure, and confirms in transmission process that directly the method for the position of shelf depreciation is not still seen relevant report.

In view of this, be necessary to provide a kind of Voltage Cable Lines Construction shelf depreciation online locating device, can in microsecond level synchronous error scope, confirm office cloth discharge source according to the time difference and discharge chromatogram characteristic, to satisfy the commercial Application needs.

Summary of the invention

The utility model technical matters to be solved is: to the online detection and location the problems referred to above of present cable line; The utility model proposes the online locating device of a kind of Voltage Cable Lines Construction shelf depreciation; The local discharge signal at each the annex place through distributed detection whole piece cable line; In microsecond level synchronous error scope, put the source definite innings according to the time difference and discharge chromatogram characteristic.

The technical scheme that the utility model adopted is: the online locating device of a kind of Voltage Cable Lines Construction shelf depreciation is characterized in that it comprises:

High-frequency wideband EM coupling sensor is socketed on threephase cable annex ground wire or the cross interconnected line, is used for the local discharge signal that is coupled;

One cover slave computer data processing and collecting unit is used to accomplish the synchronous triggering sampling of threephase cable accessory sensor signal, comprises the preposition conditioning of signal unit, I/O control module, high-speed data acquisition card, photoelectric conversion module; The preposition conditioning of signal unit is nursed one's health earlier the signal of sensors coupled, extracts power-frequency voltage signal and local discharge signal; The I/O control module is accomplished the control of gathering; High-speed data acquisition card is accomplished the signal after the conditioning is gathered, and stores in the ROM of slave computer, and photoelectric conversion module is sent to the host computer unit with image data; And

The ipc monitor unit; Link to each other with slave computer through optical fiber transmission network; Be used to control slave computer and receive image data, and with the power-frequency voltage phase place serve as with reference to the time-domain signal that forms shelf depreciation show, the real-time demonstration of the discharge spectrogram of the demonstration of apparent discharge capacity, discharge capacity-discharge phase.

The beneficial effect of the utility model is: the advantage of the utility model is and can through Voltage Cable Lines Construction being carried out distributed microsecond level synchronous high-speed sampling, realizes the online location of shelf depreciation according to on-the-spot needs.The mode of this device wideband high speed acquisition can be obtained complete local discharge signal waveform, according to signal time delay and discharge chromatogram characteristic, distinguishing discharge source, for the state maintenance of cable machinery provides strong technical support.

Description of drawings

Fig. 1 is the functional schematic block diagram of the online locating device of the utility model embodiment Voltage Cable Lines Construction shelf depreciation.

Fig. 2 is the practical implementation synoptic diagram of the online locating device of the utility model embodiment Voltage Cable Lines Construction shelf depreciation.

Embodiment

In order to understand the utility model better, further illustrate the content of the utility model below in conjunction with embodiment, but the content of the utility model not only is confined to following embodiment.Those skilled in the art can do various changes or modification to the utility model, and these equivalent form of values are equally within the listed claims limited range of the application.

The online locating device of Voltage Cable Lines Construction shelf depreciation that the utility model provides comprises: high-frequency wideband EM coupling sensor, cover slave computer data processing and a collecting unit and an ipc monitor unit.

High-frequency wideband EM coupling sensor is socketed on threephase cable annex ground wire or the cross interconnected line, is used for the local discharge signal that is coupled.

Slave computer data processing and collecting unit are used to accomplish the synchronous triggering sampling of threephase cable accessory sensor signal, comprise the preposition conditioning of signal unit, I/O control module, high-speed data acquisition card, photoelectric conversion module; The preposition conditioning of signal unit is nursed one's health earlier the signal of sensors coupled, extracts power-frequency voltage signal and local discharge signal; The I/O control module is accomplished the control of gathering; High-speed data acquisition card is accomplished the signal after the conditioning is gathered, and stores in the ROM of slave computer, and photoelectric conversion module is sent to the host computer unit with image data.

The ipc monitor unit; Link to each other with slave computer through optical fiber transmission network; Be used to control slave computer and receive image data, and with the power-frequency voltage phase place serve as with reference to the time-domain signal that forms shelf depreciation show, the real-time demonstration of the discharge spectrogram of the demonstration of apparent discharge capacity, q-φ (discharge capacity-discharge phase).

Be elaborated in the face of each parts down.

1) high-frequency wideband EM coupling sensor

The high-frequency wideband signal transducer adopts nickel-zinc ferrite, and frequency range is 20kHz-25MHz, is socketed in during measurement that to form sensor on three-phase annex ground wire or the cross interconnected line right, and the signal of coupling comprises local discharge signal, interference, ground unrest.

50Hz power frequency component sensor is used for the power current signal of coupling cable body, as triggering collection, and the operating frequency phase at definite discharge signal place.

2) slave computer data processing and collecting unit

Slave computer is installed near the sensor, the signal of sensor output is carried out the hardware filtering partly disturb, and makes follow-up amplifying unit amplify local discharge signal, to improve detection sensitivity.The slave computer unit comprises the preposition conditioning of signal unit, I/O control module, high-speed data acquisition card, photoelectric conversion module.

Said I/O control module is used for the transmission of control command between upper and lower computer and receives.

The high sampling rate of said high-speed data acquisition card is 60MS/s, and analog bandwidth is 30MHz, and A/D resolution is 12, and the signal storage of high speed acquisition is in ROM.

Said photoelectric conversion module is used for synchronous multiple signals, makes it in microsecond level error range internal trigger collection, and with slave computer image data high-speed transfer to upper machine monitoring unit.

Said photoelectric conversion module adopts the triumphant unjacketed optical fiber of band steel, and wherein one as subsequent use.Every optical fiber 16 cores block optical fiber welding and draw one road optical fiber being connected to a slave computer unit in the fibre concentrator of each node.Photoelectric conversion module adopts the time service synchronization mechanism, and the slave computer unit at multichannel annex place carries out the synchronous triggering sampling synchronously.

3) ipc monitor unit

Host computer is controlled slave computer data processing and collecting unit, carries out anti-interference process after receiving image data, and time-domain signal, placing TV are put at discharge capacity in demonstration office, and discharge spectrogram such as q-φ.To the time delay and the analysis of discharge chromatogram characteristic of multiple signals, thereby confirm discharge source.

The host computer unit is used for controlling the slave computer data acquisition, program control signal conditioning unit is set and controls the image data that reception slave computer ROM stores.

After each phase synchronization signal carried out comprehensive anti-interference process, the host computer unit extracted discharge spectrograms such as the original time domain waveform of local discharge signal, shelf depreciation apparent discharge capacity and q-φ.

The shelf depreciation original signal time delay that the synchronous triggering of whole piece cable line is gathered compares and the analysis of discharge chromatogram characteristic, can effectively confirm the position of discharge source, and insulation degradation is carried out forecast in early stage and assessment, actively effectively prevents cable system burst operation troubles.

Adopt the online localization method of Voltage Cable Lines Construction shelf depreciation of the online locating device of above-mentioned Voltage Cable Lines Construction shelf depreciation, it comprises the steps:

1) socket high-frequency wideband EM coupling sensor on each cable accessory ground wire of whole piece cable line or cross interconnected line;

2) utilize the accurate time service mechanism of optical fiber, more the slave computer unit at every group of annex place of synchronous triggering makes to organize the synchronous error scope inter-sync triggering collection 20ms signals of signals below 1 microsecond, and after gathering, digital signal is stored among the slave computer ROM;

3) socket 50Hz power current sensor on cable body through sampling on the passage that also inserts high-speed data acquisition card behind the signal condition, is used for the triggering of local discharge signal acquisition channel, to confirm the power-frequency voltage phase place of local discharge signal;

4) include signal condition module, photoelectric conversion module, high-speed data acquisition card, I/O card in the slave computer, be used for accomplishing triggering collection, the data storage of local discharge signal;

5) optical fiber transmission network is connected to the ipc monitor unit with each slave computer monitoring means;

6) hardware controls to slave computer is accomplished in the ipc monitor unit, and the demonstration of discharge spectrogram of demonstration, the discharge capacity-discharge phase of demonstration, the apparent discharge capacity of original time-domain signal is put in the reception of image data, office;

7) through to close on the annex discharge capacity the time difference and discharge spectrogram relatively, judgement office discharge signal source, thus grasp whole piece cable line insulation operation conditions.

The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.

Claims (1)

1. online locating device of Voltage Cable Lines Construction shelf depreciation is characterized in that it comprises:

High-frequency wideband EM coupling sensor is socketed on threephase cable annex ground wire or the cross interconnected line, is used for the local discharge signal that is coupled;

One cover slave computer data processing and collecting unit is used to accomplish the synchronous triggering sampling of threephase cable accessory sensor signal, comprises the preposition conditioning of signal unit, I/O control module, high-speed data acquisition card, photoelectric conversion module; The preposition conditioning of signal unit is nursed one's health earlier the signal of sensors coupled, extracts power-frequency voltage signal and local discharge signal; The I/O control module is accomplished the control of gathering; High-speed data acquisition card is accomplished the signal after the conditioning is gathered, and stores in the ROM of slave computer, and photoelectric conversion module is sent to the host computer unit with image data; And

The ipc monitor unit; Link to each other with slave computer through optical fiber transmission network; Be used to control slave computer and receive image data, and with the power-frequency voltage phase place serve as with reference to the time-domain signal that forms shelf depreciation show, the real-time demonstration of the discharge spectrogram of the demonstration of apparent discharge capacity, discharge capacity-discharge phase.

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