CN112394267A - High-speed data acquisition board for cable partial discharge signals - Google Patents
High-speed data acquisition board for cable partial discharge signals Download PDFInfo
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- CN112394267A CN112394267A CN202011403155.1A CN202011403155A CN112394267A CN 112394267 A CN112394267 A CN 112394267A CN 202011403155 A CN202011403155 A CN 202011403155A CN 112394267 A CN112394267 A CN 112394267A
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- partial discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
Abstract
The invention discloses a high-speed data acquisition board for cable partial discharge signals, wherein a first partial discharge sensor is connected with a data storage unit through a first high-speed AD acquisition unit, a second partial discharge sensor is connected with the data storage unit through a second high-speed AD acquisition unit, a third partial discharge sensor is connected with the data storage unit through a third high-speed AD acquisition unit, a phase sensor is connected with the input end of a phase recognition unit through a fourth high-speed AD acquisition unit, the output end of the phase recognition unit is connected with the control end of the data storage unit through a trigger control unit, and the output end of the data storage unit is connected with an upper computer through a data transmission unit.
Description
Technical Field
The invention belongs to the field of power control, and relates to a high-speed data acquisition board for a cable partial discharge signal.
Background
When GIS or cable inside takes place partial discharge, because outside insulation protection layer dielectric strength is high, partial discharge pulse's rising edge is very steep, and pulse width is mostly the nanosecond level, and the sensor 11HFCT is put and installs the detection partial discharge signal outside the flange junction of GIS or the cable protection layer, through data acquisition, data storage, transmission link, gives the host computer and carries out data analysis and multicycle noise filtering, so gather the board and just solve two major difficulties at the beginning of the design: 1. sampling multi-channel high-speed parallel data; 2. the signal of a plurality of power frequency cycles can be collected at one time, and the sampling storage time reaches more than hundreds of milliseconds. This results in complex acquisition card equipment and great technical difficulty after implementation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-speed data acquisition board for a cable partial discharge signal, which can effectively overcome the defects of short low-speed sampling and measuring period, inaccurate discharge amplitude judgment and slow processing.
In order to achieve the above purpose, the high-speed data acquisition board for cable partial discharge signals according to the present invention includes a high-speed AD acquisition module, a data storage unit, a phase sensor for acquiring a phase signal of a commercial power, a first partial discharge sensor, a second partial discharge sensor, and a third partial discharge sensor for respectively acquiring ABC phase partial discharge signals;
the high-speed AD acquisition module comprises a first high-speed AD acquisition unit, a second high-speed AD acquisition unit, a third high-speed AD acquisition unit and a fourth high-speed AD acquisition unit, a first local discharge sensor is connected with the data storage unit through the first high-speed AD acquisition unit, a second local discharge sensor is connected with the data storage unit through the second high-speed AD acquisition unit, a third local discharge sensor is connected with the data storage unit through the third high-speed AD acquisition unit, a phase sensor is connected with the input end of the phase identification unit through the fourth high-speed AD acquisition unit, the output end of the phase identification unit is connected with the control end of the data storage unit through a trigger control unit, and the output end of the data storage unit is connected with the upper computer through a data transmission unit.
The high-speed AD acquisition module is internally provided with an AD9608 chip and an FPGA chip.
The data storage unit adopts 8GB DDR3 memory with large capacity.
The data transmission unit is connected with the upper computer through a TCP protocol.
The network chip used by the data transmission unit is W5300.
When the high-speed digital signal acquisition device works, a first high-speed AD acquisition unit, a second high-speed AD acquisition unit and a third high-speed AD acquisition unit acquire partial discharge signals acquired by a first partial discharge sensor, a second partial discharge sensor and a third partial discharge sensor and then input the partial discharge signals into a data storage unit, meanwhile, a fourth high-speed AD acquisition unit acquires a phase signal of commercial power through the phase sensor and then inputs the phase signal of the commercial power into a phase recognition unit, the phase recognition unit performs denoising and filtering processing on the phase signal and then performs phase recognition, and controls the data storage unit through a trigger control unit according to the recognized phase to control the starting moment of AD acquisition, and data in the data storage unit is input into an upper computer through a data transmission unit.
The invention has the following beneficial effects:
when the high-speed data acquisition board for the cable partial discharge signal is specifically operated, the first high-speed AD acquisition unit, the second high-speed AD acquisition unit and the third high-speed AD acquisition unit are adopted to synchronously sample output signals of partial discharge sensors corresponding to three phases of electricity and then store the output signals in the data storage unit, so that accurate and synchronous judgment on three-phase electricity discharge amount is guaranteed. Meanwhile, the phase signal of the mains supply is sampled through the fourth high-speed AD acquisition unit, the data volume is improved to the maximum extent, the processing room is improved for subsequent phase processing, an accurate basis is provided for phase judgment, the phase error is ensured to be less than 2 degrees, and the defects of short low-speed sampling measurement period, inaccurate discharge amplitude judgment and slow processing are overcome. In addition, the data storage unit is controlled according to the phase information obtained by the phase identification unit so as to control the starting time of AD sampling, so that the relation between the local discharge signal and the phase of the commercial power can be judged.
Furthermore, the data storage unit adopts an 8GB high-capacity DDR3 memory, can store sampling data of continuous 1 second, ensures accurate judgment of the local discharge amount of continuous multiple periods, and avoids error zones caused by the accidental collection of a single power frequency period.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The system comprises a partial discharge sensor 1, a phase sensor 2, a first high-speed AD acquisition unit 3, a second high-speed AD acquisition unit 4, a third high-speed AD acquisition unit 5, a fourth high-speed AD acquisition unit 6, a data storage unit 7, a trigger control unit 8, a phase recognition unit 9, a data transmission unit 10 and an upper computer 11.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the high-speed data acquisition board for cable partial discharge signals according to the present invention includes a high-speed AD acquisition module, a data storage unit 7, a phase sensor 2 for acquiring a phase signal of a commercial power, a first partial discharge sensor 101, a second partial discharge sensor 102, and a third partial discharge sensor 103 for respectively acquiring ABC opposite partial discharge signals; the high-speed AD acquisition module comprises a first high-speed AD acquisition unit 3, a second high-speed AD acquisition unit 4, a third high-speed AD acquisition unit 5 and a fourth high-speed AD acquisition unit 6, a first partial discharge sensor 101 is connected with a data storage unit 7 through the first high-speed AD acquisition unit 3, a second partial discharge sensor 102 is connected with the data storage unit 7 through the second high-speed AD acquisition unit 4, a third partial discharge sensor 103 is connected with the data storage unit 7 through the third high-speed AD acquisition unit 5, a phase sensor 2 is connected with the input end of a phase recognition unit 9 through the fourth high-speed AD acquisition unit 6, the output end of the phase recognition unit 9 is connected with the control end of the data storage unit 7 through a trigger control unit 8, and the output end of the data storage unit 7 is connected with an upper computer 11 through a data transmission unit 10.
When the device works, the first high-speed AD acquisition unit 3, the second high-speed AD acquisition unit 4 and the third high-speed AD acquisition unit 5 acquire partial discharge signals acquired by the first partial discharge sensor 101, the second partial discharge sensor 102 and the third partial discharge sensor 103, then inputting the phase signals into a data storage unit 7, meanwhile, a fourth high-speed AD acquisition unit 6 acquires the phase signals of the mains supply through a phase sensor 2, then inputting the phase signals of the mains supply into a phase recognition unit 9, the phase recognition unit 9 carries out denoising and filtering processing on the phase signals, the influence caused by load change and external electromagnetic interference is avoided, then, phase recognition is performed, and the data storage unit 7 is controlled by the trigger control unit 8 according to the recognized phase, to control the start time of the AD acquisition, the data in the data storage unit 7 is input to the upper computer 11 via the data transmission unit 10.
Specifically, phase place identification unit 9 firstly carries out the phase place signal of commercial power and removes noise filtering, and the commercial power makes its waveform contain a large amount of interference signal because load change, outside electromagnetic interference, will carry out phase place identification, then need filtering interference signal reuse outside power frequency synchronization technology, and this data processing process is whole inside the realization in FPGA, for phase place judgement provides accurate foundation, ensures that phase error is less than 2 degrees.
The high-speed AD acquisition module adopts four-channel high-speed AD synchronous sampling, the high-speed AD acquisition module adopts an AD9608 chip, the AD9608 chip is a double-channel analog-to-digital converter, the 10-bit precision is realized, the sampling frequency can reach 125Msps, the high-speed acquisition requirement of partial discharge is met, the acquired signal frequency band reaches 650MHZ, and the acquisition of high-frequency signals is met. An FPGA chip adopted by the high-speed AD acquisition module is 5CEFA5F23I7N, and output signals of partial discharge sensors corresponding to three-phase electricity are synchronously sampled at a speed of three channels of 125M, so that accurate and synchronous judgment on the discharge quantity of the three-phase electricity is ensured; and the fourth path samples the phase signals of the mains supply, so that the data volume is improved to the maximum extent, and a processing room is provided for subsequent phase processing.
The data storage unit 7 uses an 8GB high-capacity DDR3 memory, and the DDR3 memory adopts an MT41J128M16JT-125IT chip, so that the temporary storage processing of the collected data is met. Storing sampling data of continuous 1 second, ensuring accurate judgment of partial discharge amount of continuous multiple periods, and acquiring time must be integral multiple of power frequency period for searching phase relation between partial discharge and commercial power phase; in order to avoid the interpretation error caused by the contingency of acquiring the discharging amplitude under the condition of only one power frequency cycle, the acquisition time reaches more than hundreds of milliseconds, and the acquisition continuity and effectiveness are ensured.
The trigger control unit 8 triggers and controls the sampling time of the high-speed AD acquisition module according to the phase information provided by the phase identification unit 9, so as to accurately control the acquisition starting position of the high-speed AD acquisition module, ensure the stability of the trigger time, and judge the relationship between the local discharge signal and the commercial power phase.
The data transmission unit 10 uploads the data to the upper computer 11 through a TCP protocol, and a network chip used by the data transmission unit 10 is W5300, so that the whole data transmission unit 10 is easy to communicate with the upper computer 11 and process the data, and transmits the data in the data storage unit 7 to the upper computer 11.
Claims (6)
1. A high-speed data acquisition board for cable partial discharge signals is characterized by comprising a high-speed AD acquisition module, a data storage unit (7), a phase sensor (2) for acquiring mains phase signals, a first partial discharge sensor (101), a second partial discharge sensor (102) and a third partial discharge sensor (103) for respectively acquiring ABC opposite partial discharge signals;
the high-speed AD acquisition module comprises a first high-speed AD acquisition unit (3), a second high-speed AD acquisition unit (4), a third high-speed AD acquisition unit (5) and a fourth high-speed AD acquisition unit (6), the first partial discharge sensor (101) is connected with the data storage unit (7) through the first high-speed AD acquisition unit (3), the second partial discharge sensor (102) is connected with the data storage unit (7) through the second high-speed AD acquisition unit (4), the third partial discharge sensor (103) is connected with the data storage unit (7) through the third high-speed AD acquisition unit (5), the phase sensor (2) is connected with the input end of the phase identification unit (9) through the fourth high-speed AD acquisition unit (6), the output end of the phase identification unit (9) is connected with the control end of the data storage unit (7) through the trigger control unit (8), and the output end of the data storage unit (7) is connected with the upper computer (11) through the data transmission unit (10).
2. The high-speed data acquisition board for the cable partial discharge signal according to claim 1, wherein the high-speed AD acquisition module is internally provided with an AD9608 chip and an FPGA chip.
3. The high-speed data acquisition board for the cable partial discharge signal according to claim 1, characterized in that the data storage unit (7) adopts 8GB DDR3 memory with large capacity.
4. The high-speed data acquisition board for cable partial discharge signals according to claim 1, characterized in that the data transmission unit (10) is connected with the upper computer (11) through a TCP protocol.
5. The high-speed data acquisition board for cable partial discharge signals according to claim 1, wherein the network chip used by the data transmission unit (10) is W5300.
6. The high-speed data acquisition board for cable partial discharge signals according to claim 1, wherein during operation, the first high-speed AD acquisition unit (3), the second high-speed AD acquisition unit (4) and the third high-speed AD acquisition unit (5) acquire partial discharge signals acquired by the first partial discharge sensor (101), the second partial discharge sensor (102) and the third partial discharge sensor (103), and then input the partial discharge signals into the data storage unit (7), meanwhile, the fourth high-speed AD acquisition unit (6) acquires phase signals of commercial power through the phase sensor (2), then inputs the phase signals of the commercial power into the phase identification unit (9), the phase identification unit (9) performs denoising and filtering processing on the phase signals, then performs phase identification, and controls the data storage unit (7) through the trigger control unit (8) according to the identified phase, the data in the data storage unit (7) is input into an upper computer (11) through a data transmission unit (10) to control the starting time of AD acquisition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011403155.1A CN112394267B (en) | 2020-12-04 | 2020-12-04 | High-speed data acquisition board for cable partial discharge signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011403155.1A CN112394267B (en) | 2020-12-04 | 2020-12-04 | High-speed data acquisition board for cable partial discharge signals |
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| CN112394267A true CN112394267A (en) | 2021-02-23 |
| CN112394267B CN112394267B (en) | 2023-07-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101418A (en) * | 2002-09-11 | 2004-04-02 | Toshiba Corp | Partial discharge detecting device |
| CN105277907A (en) * | 2015-09-30 | 2016-01-27 | 国家电网公司 | On-site assessment system for partial discharge sensor |
| CN105467283A (en) * | 2015-12-04 | 2016-04-06 | 重庆臻远电气有限公司 | A partial discharge signal acquisition device |
| CN106841938A (en) * | 2016-12-22 | 2017-06-13 | 广州智丰电气科技有限公司 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
| CN107831416A (en) * | 2017-10-24 | 2018-03-23 | 四川省东宇信息技术有限责任公司 | A kind of cable local discharge monitoring method |
-
2020
- 2020-12-04 CN CN202011403155.1A patent/CN112394267B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101418A (en) * | 2002-09-11 | 2004-04-02 | Toshiba Corp | Partial discharge detecting device |
| CN105277907A (en) * | 2015-09-30 | 2016-01-27 | 国家电网公司 | On-site assessment system for partial discharge sensor |
| CN105467283A (en) * | 2015-12-04 | 2016-04-06 | 重庆臻远电气有限公司 | A partial discharge signal acquisition device |
| CN106841938A (en) * | 2016-12-22 | 2017-06-13 | 广州智丰电气科技有限公司 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
| CN107831416A (en) * | 2017-10-24 | 2018-03-23 | 四川省东宇信息技术有限责任公司 | A kind of cable local discharge monitoring method |
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| CN112394267B (en) | 2023-07-21 |
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