CN103308828A - Partial discharge electro-acoustic signals synchronous monitoring device for CPLD (complex programmable logic device)-based transformer - Google Patents
Partial discharge electro-acoustic signals synchronous monitoring device for CPLD (complex programmable logic device)-based transformer Download PDFInfo
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Abstract
The invention discloses a partial discharge electro-acoustic signals synchronous monitoring device for a CPLD (complex programmable logic device)-based transformer. The device comprises a CPLD control module, as well as a sensor module, a signal conditioning module, a four-channel synchronous sampling ADC (analog to digital converter), a deserializer module, an FIFO (first in first out) storer, a PCI (peripheral component interconnect) bus interface circuit and a host computer which are respectively connected with the CPLD control module. After the device is used, the signal conditioning, the synchronous A/D (analog to digital) sampling and the data placement are carried out on a plurality of electro-acoustic signals generated by the partial discharge of the transformer by the CPLD control signal conditioning module, the four-channel synchronous sampling ADC and the FIFO storer, and the electro-acoustic signals are uploaded to the host computer through a PCI bus to be comprehensively analyzed and processed, so that the wideband electro-acoustic signals can be synchronously monitored on the line, the integrated partial discharge signal characteristic can be timely obtained, the monitoring veracity can be improved, and the device is high in reliability, high in anti-jamming capability, and stable to run.
Description
Technical field
The invention belongs to electricity-acoustical signal that partial discharge of transformer is produced and carry out the monitoring equipment of synchronized sampling, be specifically related to a kind of monitoring device that the electricity-acoustical signal of partial discharge of transformer is carried out synchronized sampling based on CPLD.
Background technology
Local discharge signal to transformer carries out real time on-line monitoring, can in time find insulation ag(e)ing situation and the prediction fault progression trend of transformer, thus the generation of prevention serious accident; Therefore, people have developed some on-Line Monitor Device, number be 201210279848.3 to disclose a kind of partial discharge of dry-type transformer on-line monitoring and localization method thereof such as Chinese patent application, the first ultrasonic sensor, the second ultrasonic sensor, the 3rd ultrasonic sensor, the 4th ultrasonic sensor gather respectively the ultrasonic signal in the local discharge signal, and transfer to signal processing unit; Uhf sensor gathers the ultra-high frequency signal in the local discharge signal, and transfers to signal processing unit; Signal processing unit amplifies with filtering four road ultrasonic signals and one road ultra-high frequency signal respectively to be processed, four road ultrasonic signals after processing and one road ultra-high frequency signal are converted to respectively four road ultrasonic digital signals and one road ultrahigh frequency digital signal and storage, reach and trigger when requiring, four road ultrasonic digital signals or four road ultrasonic digital signals and one road ultra-high frequency signal transfer to computing machine, and computing machine calculates the location of realizing partial discharge position.Although above-mentioned technical scheme has realized the monitoring to transformer partial discharge signal to a certain extent, its wideband electricity-acoustical signal to shelf depreciation is carried out synchronous live signal monitoring and is still had certain difficulty.This mainly is because the pulsed current signal of the local discharge signal of transformer and the frequency range very wide (about 10kHz～10MHz) of ultrasonic signal, and be subject to the electromagnetic interference (EMI) of working site, the impact of mechanical vibration noise, to the sampling rate of A/D conversion and the data transmission of processor, signal processing and jamproof requirement are very high, use single-chip microcomputer or DSP as the partial discharge monitoring device of master controller, the hardware resource limitations of controlled device self, be difficult to realize the electricity-acoustical signal of local discharge generation is carried out synchronous high-speed A/D sampling and complicated signal operation, precision and the reliability of monitoring have been affected, and adopt high performance data collecting card and special-purpose office to put analyzing and positioning software Partial discharge signal is carried out the cost that acquisition and processing has improved system, be difficult in, be widely applied on the miniature transformer.Therefore, in the market transformer partial discharge signal on-line monitoring equipment also requires further improvement, develops.
CPLD (Complex Programmable Logic Device) CPLD, belong to the large scale integrated circuit scope, having the computing of hypervelocity parallel logic and control function, is a kind of user according to needs separately and the digital integrated circuit of constitutive logic function voluntarily.The characteristics such as it has that design and manufacture cost is low, strong security, antijamming capability are strong, stable can realize fairly large circuit design, therefore are widely used among the prototype and production (generally below 10,000) of product.Yet, according to inventor's By consulting literatures, yet there are no the pertinent literature that CPLD is applied in the transformer partial discharge signal on-line monitoring equipment and report.Therefore, the inventor feels to research and develop a kind of how CPLD being applied in the transformer partial discharge signal on-line monitoring equipment, is to be badly in need of in the market thereby there is the device of the problem that degree of accuracy is not high, reliability is not strong in the solution existing equipment.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device is provided, the CPLD control multi-channel high-speed A/D converter that the utilization of this device has hypervelocity parallel logic calculation function carries out the synchronous high-speed sampling to wideband (about 10kHz～10MHz) pulsed current signal and the ultrasonic signal that partial discharge of transformer produces, then by pci bus interface sampled data is uploaded to host computer, in host computer, adopt FFT, wavelet transformation, correlation analysis, the signal processing algorithm real-time analysiss such as digital filtering go out the signal characteristic of partial discharge of transformer, thereby accurately judge the fault type of transformer, fault degree and abort situation, and can also realize intellectuality to transformer, network monitoring.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device comprises sensor assembly, signal condition module, four-way synchronized sampling ADC and host computer; Wherein, this device also comprises CPLD control module, deserializer module, FIFO storer and pci bus interface circuit; According to the transport stream of signal to, described sensor assembly, signal condition module, four-way synchronized sampling ADC, deserializer module, FIFO storer, pci bus interface circuit are connected with host computer and are connected, and are specially:
Described sensor assembly is provided with four sensors, be respectively rogowski coil sensors A, rogowski coil sensor B, ultrasonic sensor A and ultrasonic sensor B, wherein, rogowski coil sensors A and rogowski coil sensor B are installed in respectively the neutral point place of transformer high and low pressure side; Ultrasonic sensor A and ultrasonic sensor B stick on the high and low pressure side oil tank wall of transformer by the gel couplant respectively; The output terminal of these four sensors is connected by the signal input part of concentric cable with the signal condition module, and the signal output part of signal condition module is connected with the signal input part of four-way synchronized sampling ADC;
Described deserializer module by deserializer A, deserializer B, deserializer C and deserializer D totally four deserializers form, the serial data input end of these four deserializers respectively with four LVDS serial data output terminals of four-way synchronized sampling ADC;
Described FIFO storer by 8 fifo chip A, 8 fifo chip B, 8 fifo chip C and 8 fifo chip D totally four 8 fifo chips form, the parallel data input end of these four 8 fifo chips respectively with four parallel data output terminals of deserializer module, and the parallel data output terminal of these four 8 fifo chips is connected with 32 bit parallel data input pins of pci bus interface circuit successively; Described pci bus interface circuit is inserted in the PCI slot of host computer, and carries out exchanges data by pci bus and host computer;
The control end of described signal condition module, four-way synchronized sampling ADC, deserializer module, FIFO storer and pci bus interface circuit is connected with the CPLD control module respectively, and described host computer is connected with the CPLD control module by the RS232 bus; Described CPLD control module is control signal conditioning module and four-way synchronized sampling ADC respectively, after 2 road pulsed current signals that the partial discharge of transformer that sensor assembly is collected produces and 2 road ultrasonic signals carry out pre-service and synchronously A/D conversion, sampled data is temporarily stored in the FIFO storer through the deserializer module, then under the control of CPLD module, after 4 tunnel 8 sampled datas are spliced into 32 bit data, pci bus interface circuit through 32 uploads to host computer, in host computer, electricity-acoustical signal combined monitoring data are carried out analysis-by-synthesis and processing, to judge whether there is partial discharge phenomenon in the transformer, simultaneously, described host computer is monitored and is arranged the duty of CPLD control module by the RS232 bus.。
Further specify as of the present invention, above-described CPLD control module is comprised of CPLD chip and the active crystal oscillator of high frequency, low-frequency active crystal oscillator, human-computer interaction interface, the RS232 interface circuit that are connected with the CPLD chip respectively; The active crystal oscillator 22 of described high frequency, low-frequency active crystal oscillator 23 is connected with the global clock port of CPLD chip 21 respectively, the I/O port of described CPLD chip respectively with the signal condition module, four-way synchronized sampling ADC, the deserializer module, the FIFO storer, the control end of pci bus interface circuit is connected the two-way connection of data terminal with the RS232 interface circuit, described RS232 interface circuit is connected with host computer is two-way, thereby realize respectively the control signal enlargement factor, the filter passbands scope, the A/D sampling rate, string-and data-switching, data fifo buffer memory and pci bus data transmission, and can realize that host computer is to the monitoring of CPLD control module.
Further specify as of the present invention, above-described rogowski coil sensors A and rogowski coil sensor B are installed in respectively the neutral point place of transformer high and low pressure side, its frequency span is set to 10kHz～10MHz, can detect the high-frequency pulse current signal that partial discharge of transformer produces; Ultrasonic sensor A and ultrasonic sensor B stick on the high and low pressure side oil tank wall of transformer by the gel couplant respectively, its frequency span is set to 40kHz～200kHz, can detect the ultrasonic signal that is produced by sharp impacts between electronics when partial discharge of transformer occurs.
Described signal condition module mainly is comprised of programmable amplifier and programmable filter, the input end of described programmable amplifier is connected with the output terminal of sensor assembly, the output terminal of programmable amplifier is connected with the input end of programmable filter, and the output terminal of programmable filter is connected with the input end of four-way synchronized sampling ADC.
Further specify as of the present invention, the concrete connected mode of the output terminal of above-described FIFO storer is: the 8 bit parallel data-out bus Q[7:0 of fifo chip A] with the D[7:0 of 32 bit parallel input buss of pci bus interface circuit] link to each other, the 8 bit parallel data-out bus Q[7:0 of fifo chip B] with the D[15:8 of 32 bit parallel input buss of pci bus interface circuit] link to each other, the 8 bit parallel data-out bus Q[7:0 of fifo chip C] with the D[23:16 of 32 bit parallel input buss of pci bus interface circuit] link to each other the 8 bit parallel data-out bus Q[7:0 of fifo chip D] and with the D[31:24 of 32 bit parallel input buss of pci bus interface circuit] link to each other.
Further specify as of the present invention, the sampling precision of above-described four-way synchronized sampling ADC is 8, switching rate reaches 100MSPS, has 4 synchronized sampling passages, and its 4 tunnel synchronous LVDS serial data output terminal links to each other with 4 serial data input ends of deserializer module respectively.
Further specify as of the present invention, the above pci bus interface circuit take 32 pci bus interface chips as core, is inserted in the PCI slot of host computer, upload the data in the host computer with dma mode by 32 pci buss.
Further specify as of the present invention, above-described host computer is equipped with LabVIEW software, use the LabVIEW software development pci bus drive and DCP, be used for receiving the synchronously sampled data of the electricity-acoustical signal of the partial discharge of transformer generation of uploading through pci bus, and employing FFT, wavelet transformation, the signal processing algorithm such as correlation analysis and digital filtering is analyzed and is processed the synchronously sampled data of electricity-acoustical signal that partial discharge of transformer produces, to obtain the signal characteristic of partial discharge of transformer, then judge whether there is partial discharge phenomenon in the transformer.
The principle of work of on-Line Monitor Device of the present invention:
After 2 rogowski coil sensors in the sensor assembly and 2 ultrasonic sensors produce high-frequency pulse current signal and ultrasonic signal during respectively with partial discharge of transformer and convert voltage signal to, through concentric cable input signal conditioning module, the signal condition module under the control of CPLD control module to the input the local discharge characteristic signal carry out program control amplification and filtering after, input four-way synchronized sampling ADC, the sampling rate that four-way synchronized sampling ADC sets according to the CPLD module is to after 4 road electricity-the sound allied signals carry out the high-speed synchronous sampling of local discharge generation, sampled data is inputted the deserializer module through 4 road LVDS high-speed serial bus, 4 deserializers in the deserializer module are converted to 4 tunnel serial samples data respectively after the 8 bit parallel data 48 fifo chips in the input fifo memory and keep in, when the quantity of sampled data reaches setting value, under the control of CPLD control module, after 4 tunnel 8 bit parallel sampled datas in the FIFO storer are spliced into 32 bit data, pci bus interface circuit through 32 uploads to host computer, in host computer, adopt FFT, wavelet transformation, correlation analysis, the feature of electricity-acoustical signal that the signal processing algorithm analysis-by-synthesis partial discharge of transformer such as digital filtering produce, thereby accurately judge the fault type of transformer, fault degree and abort situation, and finish data and show, the function such as analysis and network service is to realize the remote online monitoring to transformer partial discharge signal.
Compared with prior art, advantage of the present invention:
1. use the CPLD control multi-channel high-speed synchronized sampling ADC with hypervelocity parallel logic control function, (scope is the synchronous real-time sampling of electricity-sound allied signal of 10kHz～10MHz) to the wideband that can realize partial discharge of transformer is produced, complete local discharge signal feature be can in time obtain, thereby accuracy and the real-time of monitoring improved.
2. use pci bus to carry out data transmission, improved speed and the real-time of data transmission.
3. in host computer, adopt the LabVIEW virtual instrument software with powerful signal processing function that the electricity-acoustical signal of local discharge generation is carried out analysis-by-synthesis and processing, not only simplified Software for Design, and the reliability and the dirigibility that have improved system, can also realize intellectuality, network monitoring to local discharge signal simultaneously.
4. this device is take CPLD as control core, and is simple in structure, easy care, and antijamming capability is strong, and job stability is high.
Description of drawings
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is the 26S Proteasome Structure and Function schematic diagram of CPLD control module among the present invention.
Among the figure: the 1-sensor assembly, the 2-CPLD control module, 3-signal condition module, 4-four-way synchronized sampling ADC, 5-deserializer module, the 6-FIFO storer, 7-PCI bus interface circuit, 8-host computer, 11-rogowski coil sensors A, 12-rogowski coil sensor B, 13-ultrasonic sensor A, 14-ultrasonic sensor B, the 21-CPLD chip, the active crystal oscillator of 22-high frequency, 23-low-frequency active crystal oscillator, the 24-human-computer interaction interface, the 25-RS232 interface circuit, the 31-programmable amplifier, the 32-programmable filter, 51-deserializer A, 52-deserializer B, 53-deserializer C, 54-deserializer D, 61-8 position fifo chip A, 62-8 position fifo chip B, 63-8 position fifo chip C, 64-8 position fifo chip D.
Embodiment
The present invention is further described below in conjunction with accompanying drawing.
Embodiment 1:
A kind of partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device comprises sensor assembly 1, signal condition module 3, four-way synchronized sampling ADC 4 and host computer 8; It is characterized in that: this device also comprises CPLD control module 2, deserializer module 5, FIFO storer 6 and pci bus interface circuit 7; According to the transport stream of signal to, described sensor assembly 1, signal condition module 3, four-way synchronized sampling ADC 4, deserializer module 5, FIFO storer 6, pci bus interface circuit 7 are connected with host computer and are connected successively, are specially:
Described sensor assembly 1 is provided with four sensors, be respectively rogowski coil sensors A 11, rogowski coil sensor B 12, ultrasonic sensor A 13 and ultrasonic sensor B 14, wherein, rogowski coil sensors A 11 and rogowski coil sensor B 12 are installed in respectively the neutral point place of transformer high and low pressure side; Ultrasonic sensor A 13 and ultrasonic sensor B 14 stick on the high and low pressure side oil tank wall of transformer by the gel couplant respectively; The output terminal of these four sensors is connected by the signal input part of concentric cable with signal condition module 3, and the signal output part of signal condition module 3 is connected with the signal input part of four-way synchronized sampling ADC 4 respectively;
Described deserializer module 5 by deserializer A 51, deserializer B 52, deserializer C 53 and deserializer D 54 totally four deserializers form, the serial data input end of these four deserializers respectively with four LVDS serial data output terminals of four-way synchronized sampling ADC 4;
Described FIFO storer 6 by 8 fifo chip A 61,8 fifo chip B 62,8 fifo chip C 63 and 8 fifo chip D 64 totally four 8 fifo chips form, the parallel data input end of these four 8 fifo chips respectively with four parallel data output terminals of deserializer module 5, and the parallel data output terminal of these four 8 fifo chips is connected with 32 bit parallel data input pins of pci bus interface circuit 7 successively, pci bus interface circuit 7 is inserted in the PCI slot of host computer 8, carries out exchanges data by pci bus and host computer 8;
Described signal condition module 3, four-way synchronized sampling ADC 4, deserializer module 5, the control end of FIFO storer 6 and pci bus interface circuit 7 is connected with CPLD control module 2 respectively, described host computer 8 is connected with CPLD control module 2 by the RS232 bus, described CPLD control module 2 is control signal conditioning module 3 and four-way synchronized sampling ADC 4 respectively, after the transformer partial discharge signal that sensor assembly 1 is collected carries out pre-service and synchronously A/D conversion, sampled data is temporarily stored in the FIFO storer 6 through deserializer module 5, then under the control of CPLD module 2, after 8 sampled datas are spliced into 32 bit data, upload to host computer 8 through pci bus interface circuit 7, in host computer 8, electricity-acoustical signal combined monitoring data are carried out analysis-by-synthesis and processing, to judge whether there is partial discharge phenomenon in the transformer, simultaneously, described host computer 8 also can be monitored and arrange the duty of CPLD control module 2 by the RS232 bus.
Embodiment 2:
The present embodiment is with the difference of embodiment 1: described CPLD control module 2 is comprised of CPLD chip 21 and the active crystal oscillator 22 of high frequency, low-frequency active crystal oscillator 23, human-computer interaction interface 24, the RS232 interface circuit 25 that are connected with CPLD chip 21 respectively; The two-way connection of data terminal that the I/O port of described CPLD chip 21 is connected with the RS232 interface circuit with the control end of signal condition module 3, four-way synchronized sampling ADC 4, deserializer module 5, FIFO storer 6, pci bus interface circuit 7 respectively, described RS232 interface circuit 25 is by RS232 bus and 8 two-way connections of host computer, and the active crystal oscillator 22 of described high frequency, low-frequency active crystal oscillator 23 are connected with the global clock port of CPLD chip 21 respectively.
Embodiment 3:
As shown in Figure 1, a kind of partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device comprises sensor assembly 1, CPLD control module 2, signal condition module 3, four-way synchronized sampling ADC 4, deserializer module 5, FIFO storer 6, pci bus interface circuit 7 and host computer 8; Described sensor assembly 1 is provided with four sensors, be respectively rogowski coil sensors A 11, rogowski coil sensor B 12, ultrasonic sensor A 13 and ultrasonic sensor B 14, wherein, rogowski coil sensors A 11 and rogowski coil sensor B 12 are installed in respectively the neutral point place of transformer high and low pressure side, its frequency span is set to 10kHz～10MHz, and being respectively applied to that pulse current with transformer high and low pressure side joint place is transformed into can be for the voltage signal of A/D conversion; Ultrasonic sensor A 13 and ultrasonic sensor B 14 stick on the high and low pressure side oil tank wall of transformer by the gel couplant respectively, its bandwidth is 40kHz～200kHz, and the ultrasonic signal that is respectively applied to produce in the transformer oil high and low pressure side fuel tank is transformed into can be for the voltage signal of A/D conversion.The output terminal of these four sensors is connected by the signal input part of concentric cable with signal condition module 3, and the signal output part of signal condition module 3 is connected with the signal input part of four-way synchronized sampling ADC 4 respectively.Described deserializer module 5 by deserializer A 51, deserializer B 52, deserializer C 53 and deserializer D 54 totally four deserializers form, the serial data input end of these four deserializers is connected with four LVDS serial data output terminals of four-way synchronized sampling ADC 4 respectively.Described FIFO storer 6 by 8 fifo chip A 61,8 fifo chip B 62,8 fifo chip C 63 and 8 fifo chip D 64 totally four 8 fifo chips form, the parallel data input end of these four 8 fifo chips is connected with four parallel data output terminals of deserializer module 5 respectively, and the parallel data output terminal of these four 8 fifo chips is connected with 32 bit parallel data input pins of pci bus interface circuit 7 successively, pci interface circuit 7 is inserted in the PCI slot of host computer 8, carries out exchanges data by pci bus and host computer 8.The two-way connection of control end that described CPLD control module 2 is connected with the pci bus interface circuit with signal condition module 3, the synchronous ADC 4 of four-way, deserializer module 5, FIFO storer 6 respectively, be connected with host computer 8 by the RS232 bus; Described CPLD control module 2 is control signal conditioning module 3 and four-way synchronized sampling ADC 4 respectively, after the high-frequency pulse current signal that the partial discharge of transformer that sensor assembly 1 is collected produces and ultrasonic signal carry out pre-service and synchronous high-speed A/D conversion, by deserializer module 5 sampled data is temporarily stored in the FIFO storer 6, then upload to host computer 8 through described pci bus interface circuit 7, in host computer 8, adopt LabVIEW software and FFT, wavelet transformation, correlation analysis, the signal processing algorithms such as digital filtering carry out analysis-by-synthesis and processing to the synchronously sampled data of electricity-acoustical signal that partial discharge of transformer produces, to judge whether there is fault in the transformer, and the type of fault and position, described host computer 8 also can be monitored and arrange the duty of CPLD control module 2 by the RS232 bus.
As shown in Figure 1, described signal condition module 3 comprises programmable amplifier 31 and programmable filter 32,4 road pulsed current signals and ultrasonic signal that the partial discharge of transformer that described programmable amplifier 31 collects sensor assembly 1 produces amplify, its enlargement factor can be regulated by CPLD control module 2, signal input programmable filter 32 after the amplification, described programmable filter 32 is used for electromagnetic interference signal and the mechanical vibration noise signal of filtering transformer working site, and its passband can be regulated by CPLD control module 2; Described signal condition module 3, under the control of CPLD control module 2,2 road pulsed current signals that the partial discharge of transformer that sensor assembly 1 is collected produces and 2 road ultrasonic signals are input four-way synchronized sampling ADC 4 after amplification and filtering.
As shown in Figure 1, described four-way synchronized sampling ADC 4, under the control of CPLD control module 2, will be through 2 road pulsed current signals and 2 road ultrasonic signals of signal condition, after A/D is transformed to digital signal synchronously, output to deserializer module 5 by 4 road LVDS high-speed serial bus; Described four-way synchronized sampling ADC 4, adopt the AD9287 chip of AD company, its switching rate is for reaching as high as 100MSPS, bandwidth is 295MHz, resolution is 8, have 4 synchronized sampling passages, 4 tunnel synchronous LVDS serial data outputs can be satisfied the requirement of 4 sections of road bureau discharge electricity-acoustical signal being carried out the high-speed synchronous sampling under the control of CPLD control module 2.
As shown in Figure 1, four-way synchronized sampling ADC 4 is 4 tunnel serial samples data of output synchronously, input respectively the deserializer A 51 of deserializer module 5, deserializer B 52, the serial data output terminal of deserializer C 53 and deserializer D 54, described 8 deserializers all adopt the SN65LV1224B chip, can receive 10 LVDS differential serial data streams and be converted to parallel data under the control of CPLD control module 2, only use in the present invention it to hang down 8 and are data bus.
As shown in Figure 1,4 tunnel 8 transformer partial discharge signal (2 road pulsed current signals, 2 road ultrasonic signals) A/D sampling serial data is after deserializer module 5 is converted to 4 tunnel 8 bit parallel data, 8 fifo chip A 61 in the difference input fifo memory 6,8 fifo chip B 62,8 fifo chip C 63, keep among 8 fifo chip D 64, described fifo chip all adopts the R8A66120FFA chip with 1MB memory capacity of Renesas, 8 bit parallel data-out bus of 4 fifo chips link to each other with 32 bit parallel data input bus (DIB)s of pci bus interface circuit 7 successively, concrete connected mode is, the 8 bit parallel data-out bus Q[7:0 of 8 fifo chip A 61] with the D[7:0 of 32 bit parallel buses of pci bus interface circuit 7] link to each other, the 8 bit parallel data-out bus Q[7:0 of 8 fifo chip B 62] with the D[15:8 of 32 bit parallel buses of pci bus interface circuit 7] link to each other, the 8 bit parallel data-out bus Q[7:0 of 8 fifo chip C 63] with the D[23:16 of 32 bit parallel buses of pci bus interface circuit 7] link to each other, the 8 bit parallel data-out bus Q[7:0 of 8 fifo chip D 64] with the D[31:24 of 32 bit parallel buses of pci bus interface circuit 7] link to each other, the output data parallel of 48 fifo chips is spliced into 32 bit data, to improve the data transmission efficiency of 32 pci bus; Described pci bus interface circuit adopts the PCI9054 chip of PLX company, has independently dma controller, and gross data transmission digit rate can reach 132Mbps, can satisfy the requirement of data transmission.
As shown in Figure 1, when the quantity of the sampled data in being temporarily stored in the FIFO storer reaches preset value, CPLD control module 2 control FIFO storer 6 and pci bus interface circuit 7, after 48 synchronously sampled datas are spliced into 32 bit data, upload in the host computer 8 by dma mode through 32 pci buss, in host computer, use and developed pci bus driving and DCP in the LabVIEW software, be used for receiving the synchronously sampled data of the electricity-acoustical signal of the partial discharge of transformer generation of uploading through pci bus, then in LabVIEW software, use FFT, wavelet transformation, correlation analysis, the electricity that the signal processing algorithm analysis-by-synthesis partial discharge of transformer such as digital filtering produce-acoustical signal feature, thereby accurately judge the fault type of transformer, fault degree and abort situation, and finish data and show, the function such as analysis and network service is to realize the remote online monitoring to transformer partial discharge signal.
As shown in Figure 2, described CPLD control module 2 is by CPLD chip 21, the active crystal oscillator 22 of high frequency, low-frequency active crystal oscillator 23, human-computer interaction interface 24, RS232 interface circuit 25 forms, described CPLD chip 21 adopts the EPM2210F256C3N type CPLD of Alter company, have 2210 logical blocks, 4 global clock interfaces, 204 user I/O, speed class is 3ns, its I/O port respectively with described human-computer interaction interface 24, signal condition module 3, four-way synchronized sampling ADC 4, deserializer module 5, FIFO storer 6, the two-way connection of data terminal that the control end of pci bus interface circuit 7 is connected with the RS232 interface circuit, the gain amplifier that is used for control programmable amplifier 31, the passband of programmable filter 32, the sampling rate of four-way synchronized sampling ADC 4, the string of deserializer 5-and the data of data-switching and FIFO storer 6 are temporary, and the data transmission of control pci bus, described RS232 interface circuit 25 is connected with host computer 8 by the RS232 bus, host computer 8 can be monitored and arrange by the duty of 25 pairs of CPLD control modules 2 of described RS232 bus interface circuit, the active crystal oscillator 22 of described high frequency, low-frequency active crystal oscillator 23 is connected with the global clock port of CPLD chip 21 respectively, be respectively applied to the height to CPLD chip 21, low speed s operation control logic provides clock signal, described CPLD chip 21 has hypervelocity parallel logic control function, is enough to satisfy the requirement of above logic control.
The partial discharge of transformer electricity based on CPLD of above-described embodiment 1-3-the acoustical signal synchronous monitoring device is simple in structure, good operating stability, and degree of accuracy is high, reliability is strong.
Claims (6)
1. the partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device comprises sensor assembly (1), signal condition module (3), four-way synchronized sampling ADC(4) and host computer (8); It is characterized in that: this device also comprises CPLD control module (2), deserializer module (5), FIFO storer (6) and pci bus interface circuit (7); According to the transport stream of signal to, described sensor assembly (1), signal condition module (3), four-way synchronized sampling ADC(4), deserializer module (5), FIFO storer (6), pci bus interface circuit (7) be connected 8 with host computer) connect successively, be specially:
Described sensor assembly (1) is provided with four sensors, be respectively rogowski coil sensors A (11), rogowski coil sensor B(12), ultrasonic sensor A(13) and ultrasonic sensor B(14), wherein, rogowski coil sensors A (11) and rogowski coil sensor B(12) be installed in respectively the neutral point place of transformer high and low pressure side; Ultrasonic sensor A(13) and ultrasonic sensor B(14) stick on the high and low pressure side oil tank wall of transformer by the gel couplant respectively; The output terminal of these four sensors is connected by the signal input part of concentric cable with signal condition module (3), the signal output part of signal condition module (3) and four-way synchronized sampling ADC(4) signal input part be connected;
Described deserializer module (5) is by deserializer A(51), deserializer B(52), deserializer C(53) and deserializer D(54) totally four deserializers form, the serial data input end of these four deserializers respectively with four-way synchronized sampling ADC(4) four LVDS serial data output terminals be connected;
Described FIFO storer (6) is by 8 fifo chip A(61), 8 fifo chip B(62), 8 fifo chip C(63) and 8 fifo chip D(64) totally four 8 fifo chips form, the parallel data input end of these four 8 fifo chips is connected with four parallel data output terminals of deserializer module (5) respectively, and the parallel data output terminal of these four 8 fifo chips is connected with 32 bit parallel data input pins of pci bus interface circuit (7) successively; Described pci bus interface circuit (7) is inserted in the PCI slot of host computer (8), and carries out exchanges data by pci bus and host computer (8);
Described signal condition module (3), four-way synchronized sampling ADC(4), the control end of deserializer module (5), FIFO storer (6) and pci bus interface circuit (7) is connected with CPLD control module (2) respectively, described host computer (8) is connected with CPLD control module (2) by the RS232 bus; Described CPLD control module (2) is control signal conditioning module (3) and four-way synchronized sampling ADC(4 respectively), after 2 road pulsed current signals that the partial discharge of transformer that sensor assembly (1) is collected produces and 2 road ultrasonic signals carry out pre-service and synchronously A/D conversion, sampled data is temporarily stored in the FIFO storer (6) through deserializer module (5), then under the control of CPLD control module (2), after 4 tunnel 8 sampled datas are spliced into 32 bit data, pci bus interface circuit (7) through 32 uploads to host computer (8), in host computer (8), electricity-acoustical signal combined monitoring data are carried out analysis-by-synthesis and processing, to judge whether there is partial discharge phenomenon in the transformer, simultaneously, described host computer (8) is monitored and is arranged the duty of CPLD control module (2) by the RS232 bus.
2. the partial discharge of transformer electricity based on CPLD according to claim 1-acoustical signal synchronous monitoring device is characterized in that: described CPLD control module (2) is comprised of CPLD chip (21) and the active crystal oscillator of high frequency (22) that is connected with CPLD chip (21) respectively, low-frequency active crystal oscillator (23), human-computer interaction interface (24), RS232 interface circuit (25); The I/O port of described CPLD chip (21) respectively with signal condition module (3), four-way synchronized sampling ADC(4), the control end of deserializer module (5), FIFO storer (6), pci bus interface circuit (7) is connected 25 with the RS232 interface circuit) two-way connection of data terminal, described RS232 interface circuit (25) and two-way connection of host computer (8), the active crystal oscillator of described high frequency (22), low-frequency active crystal oscillator (23) are connected with two global clock ports of CPLD chip (21) respectively.
3. arbitrary described partial discharge of transformer electricity based on CPLD-acoustical signal synchronous monitoring device according to claim 1 and 2 is characterized in that: described rogowski coil sensors A (11) and rogowski coil sensor B(12) frequency span all be set to 10kHz～10MHz; Described ultrasonic sensor A(13) and ultrasonic sensor B(14) frequency span all be set to 40kHz～200kHz.
4. the partial discharge of transformer electricity based on CPLD according to claim 3-acoustical signal synchronous monitoring device, it is characterized in that: described signal condition module (3) mainly is comprised of programmable amplifier (31) and programmable filter (32), the input end of described programmable amplifier (31) is connected with the output terminal of sensor assembly (1), the output terminal of programmable amplifier (31) is connected with the input end of programmable filter (32), the output terminal of programmable filter (32) and four-way synchronized sampling ADC(4) input end be connected.
5. the partial discharge of transformer electricity based on CPLD according to claim 4-acoustical signal synchronous monitoring device, it is characterized in that: sampling precision described four-way synchronized sampling ADC(4) is 8, switching rate reaches 100MSPS, have 4 synchronized sampling passages, its 4 tunnel synchronous LVDS serial data output terminal links to each other with 4 serial data input ends of deserializer module (5) respectively.
6. according to claim 1-2 or the arbitrary described partial discharge of transformer electricity based on CPLD of 4-5-acoustical signal synchronous monitoring device, it is characterized in that: described host computer (8) adopts FFT, wavelet transformation, correlation analysis and digital filtered signal Processing Algorithm that the synchronously sampled data of the electricity-acoustical signal of partial discharge of transformer generation is analyzed and processed, to judge whether there is partial discharge phenomenon in the transformer.
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