CN103809087A - PLC (programmable logic controller) based online monitoring device for partial discharge signals of transformer - Google Patents
PLC (programmable logic controller) based online monitoring device for partial discharge signals of transformer Download PDFInfo
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- CN103809087A CN103809087A CN201310715630.2A CN201310715630A CN103809087A CN 103809087 A CN103809087 A CN 103809087A CN 201310715630 A CN201310715630 A CN 201310715630A CN 103809087 A CN103809087 A CN 103809087A
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Abstract
The invention discloses a PLC (programmable logic controller) based online monitoring device for partial discharge signals of a transformer. The online monitoring device comprises a PLC, a sensor module, a signal processing circuit module, an analog-to-digital converter, a deserializer module, an FIFO (first in first out) storage, a PCI (peripheral component interconnect) bus interface circuit and an upper computer, wherein the sensor module, the signal processing circuit module, the analog-to-digital converter, the deserializer module, the FIFO storage, the PCI bus interface circuit and the upper computer are respectively connected with the PLC. The PLC is used for controlling the signal processing circuit module, the analog-to-digital converter and the FIFO storage, a plurality of electro-acoustic signals generated by partial discharge of the transformer are uploaded to the upper computer for comprehensive analysis and processing through a PCI bus after processing, synchronous A/D (analog-to-digital) sampling and data temporary storage, wideband electro-acoustic signals can be synchronously monitored on line, complete partial discharge signal characteristics can be timely acquired, monitoring accuracy is improved, and the device is high in reliability and interference resistance and stable in operation.
Description
Technical field
The invention belongs to the monitoring equipment that the signal that partial discharge of transformer is produced carries out synchronized sampling, be specifically related to a kind of transformer partial discharge signal on-Line Monitor Device based on PLC.
Background technology
The local discharge signal of transformer is carried out to real time on-line monitoring, can find in time insulation ag(e)ing situation and the prediction fault progression trend of transformer, thus the effective way of the generation of prevention serious accident; Therefore, people have developed some on-Line Monitor Device, if Chinese Patent Application No. is 201210279848.3 to disclose a kind of partial discharge of dry-type transformer on-line monitoring and localization method thereof, the first ultrasonic sensor, the second ultrasonic sensor, the 3rd ultrasonic sensor, the 4th ultrasonic sensor gather respectively the ultrasonic signal in local discharge signal, and transfer to signal processing unit; Uhf sensor gathers the ultra-high frequency signal in local discharge signal, and transfers to signal processing unit; Signal processing unit respectively ultrasonic signal He Yi road, Dui Si road ultra-high frequency signal amplifies and filtering processing, four ultrasonic signal He Yi road, road ultra-high frequency signals after treatment are converted to respectively to four ultrasonic digital signal He Yi road, road ultrahigh frequency digital signals storage, reach and trigger while requirement, four ultrasonic digital signal Yu Yi road, ultrasonic digital signal Huo Si road, road ultra-high frequency signals 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 is mainly because the pulsed current signal of local discharge signal of transformer and the frequency range of ultrasonic signal very wide (10kHz～10MHz left and right), and be subject to the electromagnetic interference (EMI) of working site, the impact of mechanical vibration noise, sampling rate to A/D conversion and the data transmission of processor, signal processing and jamproof requirement are very high, use single-chip microcomputer or the DSP partial discharge monitoring device as 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 to synchronous high-speed A/D sampling and complicated signal operation, precision and the reliability of monitoring are affected, and adopt high performance data collecting card and special office to put analyzing and positioning software Partial discharge signal is carried out acquisition and processing and improved the cost of system, be difficult in, on miniature transformer, be widely applied.Therefore, transformer partial discharge signal on-line monitoring equipment in the market also requires further improvement, develops.
PLC=Programmable Logic Controller, programmable logic controller (PLC), the electronic system of a kind of digital operation operation, aims in industrial environment application and design.It adopts a class programmable memory, for its internally stored program, and actuating logic computing, sequential control, regularly, the user oriented instructions such as counting and arithmetical operation, and control various types of machinery or production run by numeral or analog pattern input/output.PLC has now become one of large pillar of Industry Control three (PLC, CAD/CAM, ROBOT), high with its reliability, logic function is strong, volume is little, can online modification control program, there is telecommunication network savvy, with easily and computer interface, can control analog quantity, possess the excellent properties such as performance module such as high-speed counting and position control, day by day replace the traditional relay-contactor control system being formed by a large amount of auxiliary reclays, the time relay, counting relay etc.
Summary of the invention
The object of the present invention is to provide a kind of transformer partial discharge signal on-Line Monitor Device based on PLC, wideband (10kHz～10MHz left and right) pulsed current signal and ultrasonic signal that the PLC controller control hyperchannel A/D converter that this device utilization has a high-speed parallel logical operation function produces partial discharge of transformer carry out synchronous high-speed sampling, 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 the intellectuality to transformer, network monitoring.
To achieve these goals, the present invention has adopted following technical scheme:
A transformer partial discharge signal on-Line Monitor Device based on PLC, comprises the sensor assembly, signal processing circuit module, A/D converter, deserializer module, FIFO storer and pci bus interface circuit and the host computer that connect successively, wherein, this device also comprises PLC controller, and PLC controller is provided with I/O port and RS232 interface, the control end of described signal processing circuit module, A/D converter, deserializer module, FIFO storer and pci bus interface circuit is connected with the I/O port of PLC controller respectively, and described host computer is connected with the RS232 interface of PLC controller by RS232 bus, described PLC controller is control signal processing circuit module and A/D converter respectively, the pulsed current signal that the partial discharge of transformer that sensor assembly is collected produces and ultrasonic signal carry out after pre-service and synchronous A/D conversion, sampled data is temporarily stored in FIFO storer through deserializer module, then under the control of PLC controller, 8 sampled datas are spliced into after 32 bit data, pci bus interface circuit through 32 uploads to host computer, in host computer, electricity-acoustical signal combined monitoring data are comprehensively analyzed and processed, to judge whether there is partial discharge phenomenon in transformer, simultaneously, described host computer is monitored and is arranged the duty of PLC controller by RS232 bus.
Further illustrate as of the present invention, above-described sensor assembly comprises 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 arranged on respectively the neutral point place of transformer high and low pressure side, its frequency span is set to 10kHz～10MHz, the high-frequency pulse current signal that partial discharge of transformer produces can be detected; Ultrasonic sensor A and ultrasonic sensor B stick on the high and low pressure side oil tank wall of transformer by gel couplant respectively, its bandwidth is 40kHz～200kHz, the ultrasonic signal that partial discharge of transformer is produced by sharp impacts between electronics while generation can be detected.
Further illustrate as of the present invention, above-described signal processing circuit module comprises signal processing circuit and signal filtering treatment circuit; The input end of described signal processing circuit is connected with the output terminal of sensor assembly, the output terminal of signal processing circuit is connected with the input end of signal filtering treatment circuit, and the output terminal of signal filtering treatment circuit is connected with the input end of A/D converter.
Further illustrate as of the present invention, above-described deserializer module mainly by deserializer A, deserializer B, deserializer C and deserializer D totally 4 deserializers form; And the serial data input end of deserializer module is connected with four-way synchronized sampling ADC, parallel data output terminal is connected with 8 bit parallel data input pins of FIFO storer.
Further illustrate as of the present invention, above-described FIFO storer is mainly made up of 8 fifo chip A, 8 fifo chip B, 8 fifo chip C and 8 fifo chip D, and 8 bit parallel data-out bus Q[7:0 of these 4 fifo chips] successively with 32 bit parallel data input bus (DIB) D[31:0 of pci bus interface circuit] be connected.Its concrete connected mode 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] be connected, 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] be connected, 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] be connected, the 8 bit parallel data-out bus Q[7:0 of fifo chip D] with the D[31:24 of 32 bit parallel input buss of pci bus interface circuit] be connected.
Further illustrate as of the present invention, the sampling precision of above-described A/D converter is 8, switching rate reaches 100MSPS, has 4 synchronized sampling passages, and its 4 tunnel synchronous LVDS serial data output terminal is connected with 4 serial data input ends of deserializer module respectively.
Further illustrate 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 host computer with dma mode by 32 pci buss.
Further illustrate as of the present invention, above-described host computer is provided with LabVIEW software, use 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 adopt FFT, wavelet transformation, the synchronously sampled data of electricity-acoustical signal that the signal processing algorithm such as correlation analysis and digital filtering produces partial discharge of transformer is analyzed and is processed, to obtain the signal characteristic of partial discharge of transformer, then judge and in transformer, whether have partial discharge phenomenon.
The principle of work of on-Line Monitor Device of the present invention:
2 rogowski coil sensors in sensor assembly and 2 ultrasonic sensors produce high-frequency pulse current signal during respectively by partial discharge of transformer and ultrasonic signal converts to after voltage signal, through concentric cable input signal processing circuit module, signal processing circuit module under the control of PLC controller to input local discharge characteristic signal amplifies with filtering after, input A/D converter, the sampling rate that A/D converter is set according to PLC controller is carried out after high-speed synchronous sampling 4 road electricity-sound allied signals of local discharge generation, sampled data is inputted to deserializer modules through 4 road LVDS high-speed serial bus, 4 deserializers in deserializer module are converted to 4 tunnel serial samples data respectively 48 fifo chips in input fifo memory after 8 bit parallel data and keep in, in the time that the quantity of sampled data reaches setting value, under the control of PLC controller, 4 tunnel 8 bit parallel sampled datas in FIFO storer are spliced into after 32 bit data, pci bus interface circuit through 32 uploads to host computer, in host computer, use FFT, wavelet transformation, correlation analysis, the signal processing algorithms such as digital filtering are comprehensively analyzed the feature of the electricity-acoustical signal of partial discharge of transformer generation, thereby accurately judge the fault type of transformer, fault degree and abort situation, and complete data show, the function such as analysis and network service, to realize the remote online monitoring to transformer partial discharge signal.
Compared with prior art, the beneficial effect that the present invention possesses is:
1. use the PLC controller control hyperchannel A/D converter with high-speed parallel logic control function, can realize the synchronous real-time sampling of wideband (scope is 10kHz～10MHz) electricity-sound allied signal that partial discharge of transformer is produced, complete local discharge signal feature be can obtain in time, 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 software with powerful signal processing function to carry out comprehensive analysis and processing to the electricity-acoustical signal of local discharge generation, not only simplify Software for Design, and the reliability and the dirigibility that have improved system, can also realize intellectuality, the network monitoring to local discharge signal simultaneously.
4. this device is take PLC controller as control core, simple in structure, easy care, and antijamming capability is strong, and job stability is high.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is the functional schematic of sensor assembly in the present invention.
In figure: 1-sensor assembly, 2-PLC controller, 3-signal processing circuit module, 4-A/D converter, 5-deserializer module, 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, 31-signal processing circuit, 32-signal filtering treatment circuit, 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
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment:
As shown in accompanying drawing 1,2, a transformer partial discharge signal on-Line Monitor Device based on PLC, comprises sensor assembly 1, signal processing circuit module 3, A/D converter 4, deserializer module 5, FIFO storer 6 and the pci bus interface circuit 7 and the host computer 8 that connect successively, wherein, this device also comprises PLC controller 2, and PLC controller 2 is provided with I/O port and RS232 interface, the control end of described signal processing circuit module 3, A/D converter 4, deserializer module 5, FIFO storer 6 and pci bus interface circuit 7 is connected with the I/O port of PLC controller 2 respectively, and described host computer 8 is connected with the RS232 interface of PLC controller 2 by RS232 bus, described PLC controller 2 control signal processing circuit module 3 and A/D converter 4 respectively, the pulsed current signal that the partial discharge of transformer that sensor assembly 1 is collected produces and ultrasonic signal carry out after pre-service and synchronous A/D conversion, sampled data is temporarily stored in FIFO storer 6 through deserializer module 5, then under the control of PLC controller 2, 8 sampled datas are spliced into after 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 comprehensively analyzed and processed, to judge whether there is partial discharge phenomenon in transformer, simultaneously, described host computer 8 is monitored and is arranged the duty of PLC controller 2 by RS232 bus.
Described sensor assembly 1 comprises 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 arranged on respectively the neutral point place of transformer high and low pressure side, and its frequency span is set to 10kHz～10MHz; Ultrasonic sensor A 13 and ultrasonic sensor B 14 stick on the high and low pressure side oil tank wall of transformer by gel couplant respectively, and its bandwidth is 40kHz～200kHz.
Described signal processing circuit module 3 comprises signal processing circuit 31 and signal filtering treatment circuit 32; The input end of described signal processing circuit 31 is connected with the output terminal of sensor assembly 1, the output terminal of signal processing circuit 31 is connected with the input end of signal filtering treatment circuit 32, and the output terminal of signal filtering treatment circuit 32 is connected with the input end of A/D converter 4.
Described deserializer module 5 mainly by deserializer A 51, deserializer B 52, deserializer C 53 and deserializer D 54 totally 4 deserializers form; And the serial data input end of deserializer module 5 is connected with the output terminal of A/D converter 4, parallel data output terminal is connected with 8 bit parallel data input pins of FIFO storer 6.
Described FIFO storer 6 is mainly made up of 63 and 8 fifo chip D 64 of 62,8 fifo chip C of 61,8 fifo chip B of 8 fifo chip A, and 8 bit parallel data-out bus Q[7:0 of these 4 fifo chips] successively with 32 bit parallel data input bus (DIB) D[31:0 of pci bus interface circuit 7] be connected.
The sampling precision of described A/D converter 4 is 8, and switching rate reaches 100MSPS, has 4 synchronized sampling passages, and its 4 tunnel synchronous LVDS serial data output terminal is connected with 4 serial data input ends of deserializer module respectively.
Described pci bus interface circuit 7, take 32 pci bus interface chips as core, is inserted in the PCI slot of host computer, upload the data in host computer with dma mode by 32 pci buss.
Described host computer 8 is provided with LabVIEW software, use 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 adopt the synchronously sampled data of the electricity-acoustical signal of the signal processing algorithms such as FFT, wavelet transformation, correlation analysis and digital filtering to partial discharge of transformer generation to analyze and process, to obtain the signal characteristic of partial discharge of transformer, then judge in transformer, whether there is partial discharge phenomenon.
The transformer partial discharge signal on-Line Monitor Device based on PLC of this embodiment is simple in structure, good operating stability, and degree of accuracy is high, reliability is strong.
Claims (8)
1. the transformer partial discharge signal on-Line Monitor Device based on PLC, comprises sensor assembly (1), signal processing circuit module (3), A/D converter (4), deserializer module (5), FIFO storer (6) and the pci bus interface circuit (7) and the host computer (8) that connect successively, it is characterized in that: this device also comprises PLC controller (2), and PLC controller (2) is provided with I/O port and RS232 interface, the control end of described signal processing circuit module (3), A/D converter (4), deserializer module (5), FIFO storer (6) and pci bus interface circuit (7) is connected with the I/O port of PLC controller (2) respectively, and described host computer (8) is connected with the RS232 interface of PLC controller (2) by RS232 bus, described PLC controller (2) is control signal processing circuit module (3) and A/D converter (4) respectively, the pulsed current signal that the partial discharge of transformer that sensor assembly (1) is collected produces and ultrasonic signal carry out after pre-service and synchronous A/D conversion, sampled data is temporarily stored in FIFO storer (6) through deserializer module (5), then under the control of PLC controller (2), 8 sampled datas are spliced into after 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 comprehensively analyzed and processed, to judge whether there is partial discharge phenomenon in transformer, simultaneously, described host computer (8) is monitored and is arranged the duty of PLC controller (2) by RS232 bus.
2. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, is characterized in that: described sensor assembly (1) comprises 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 arranged on respectively the neutral point place of transformer high and low pressure side, its frequency span is set to 10kHz～10MHz; Ultrasonic sensor A(13) and ultrasonic sensor B(14) stick on the high and low pressure side oil tank wall of transformer by gel couplant respectively, its bandwidth is 40kHz～200kHz.
3. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, is characterized in that: described signal processing circuit module (3) comprises signal processing circuit (31) and signal filtering treatment circuit (32); The input end of described signal processing circuit (31) is connected with the output terminal of sensor assembly (1), the output terminal of signal processing circuit (31) is connected with the input end of signal filtering treatment circuit (32), and the output terminal of signal filtering treatment circuit (32) is connected with the input end of A/D converter (4).
4. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, is characterized in that: described deserializer module (5) mainly by deserializer A (51), deserializer B (52), deserializer C (53) and deserializer D (54) totally 4 deserializers form; And the serial data input end of deserializer module (5) is connected with the output terminal of A/D converter (4), parallel data output terminal is connected with 8 bit parallel data input pins of FIFO storer (6).
5. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, it is characterized in that: described FIFO storer (6) is mainly made up of 8 fifo chip A (61), 8 fifo chip B (62), 8 fifo chip C (63) and 8 fifo chip D (64), and 8 bit parallel data-out bus Q[7:0 of these 4 fifo chips] successively with 32 bit parallel data input bus (DIB) D[31:0 of pci bus interface circuit (7)] be connected.
6. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, it is characterized in that: the sampling precision of described A/D converter (4) is 8, switching rate reaches 100MSPS, have 4 synchronized sampling passages, its 4 tunnel synchronous LVDS serial data output terminal is connected with 4 serial data input ends of deserializer module respectively.
7. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, it is characterized in that: described pci bus interface circuit (7) is take 32 pci bus interface chips as core, be inserted in the PCI slot of host computer, upload the data in host computer with dma mode by 32 pci buss.
8. the transformer partial discharge signal on-Line Monitor Device based on PLC according to claim 1, it is characterized in that: described host computer (8) is provided with LabVIEW software, use 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 adopt FFT, wavelet transformation, the synchronously sampled data of electricity-acoustical signal that the signal processing algorithm such as correlation analysis and digital filtering produces partial discharge of transformer is analyzed and is processed, to obtain the signal characteristic of partial discharge of transformer, then judge and in transformer, whether have partial discharge phenomenon.
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| CN201310715630.2A CN103809087A (en) | 2013-12-23 | 2013-12-23 | PLC (programmable logic controller) based online monitoring device for partial discharge signals of transformer |
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| CN201310715630.2A CN103809087A (en) | 2013-12-23 | 2013-12-23 | PLC (programmable logic controller) based online monitoring device for partial discharge signals of transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104268108A (en) * | 2014-09-10 | 2015-01-07 | 南京国电南自美卓控制***有限公司 | Method for achieving conversion from RS232 to BLVDS bus |
| CN106443376A (en) * | 2016-09-20 | 2017-02-22 | 国网天津市电力公司 | Partial discharge positioning system for switch cabinet comprising multiple TEV sensors |
| CN106556770A (en) * | 2016-11-24 | 2017-04-05 | 国网河南省电力公司周口供电公司 | A kind of self-priming leakage monitoring device and monitoring method |
| CN108303621A (en) * | 2017-12-15 | 2018-07-20 | 山东康威通信技术股份有限公司 | The front end data acquisition and buffer circuit, system and method for partial discharge are synchronized based on clock |
| CN111505455A (en) * | 2020-04-26 | 2020-08-07 | 国家电网有限公司 | High-voltage switch cabinet partial discharge positioning detection system and detection method |
-
2013
- 2013-12-23 CN CN201310715630.2A patent/CN103809087A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104268108A (en) * | 2014-09-10 | 2015-01-07 | 南京国电南自美卓控制***有限公司 | Method for achieving conversion from RS232 to BLVDS bus |
| CN106443376A (en) * | 2016-09-20 | 2017-02-22 | 国网天津市电力公司 | Partial discharge positioning system for switch cabinet comprising multiple TEV sensors |
| CN106556770A (en) * | 2016-11-24 | 2017-04-05 | 国网河南省电力公司周口供电公司 | A kind of self-priming leakage monitoring device and monitoring method |
| CN108303621A (en) * | 2017-12-15 | 2018-07-20 | 山东康威通信技术股份有限公司 | The front end data acquisition and buffer circuit, system and method for partial discharge are synchronized based on clock |
| CN111505455A (en) * | 2020-04-26 | 2020-08-07 | 国家电网有限公司 | High-voltage switch cabinet partial discharge positioning detection system and detection method |
| CN111505455B (en) * | 2020-04-26 | 2023-03-14 | 国家电网有限公司 | High-voltage switch cabinet partial discharge positioning detection system and detection method |
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