CN112394267B - 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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- CN112394267B CN112394267B CN202011403155.1A CN202011403155A CN112394267B CN 112394267 B CN112394267 B CN 112394267B CN 202011403155 A CN202011403155 A CN 202011403155A CN 112394267 B CN112394267 B CN 112394267B
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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
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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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing Relating To Insulation (AREA)
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 identification unit through a 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 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 cable partial discharge signals.
Background
When partial discharge occurs in the GIS or the cable, the rising edge of the partial discharge pulse is steep due to the high insulation strength of the external insulation protection layer, the pulse width is at nanosecond level, the partial discharge sensor 11HFCT is arranged at the flange joint of the GIS or outside the cable protection layer to detect the partial discharge signal, and the partial discharge signal is delivered to the upper computer for data analysis and multi-period noise filtering through data acquisition, data storage and transmission links, so that two major difficulties are solved at the beginning of design of the acquisition board: 1. multichannel high-speed parallel data sampling; 2. the signal of a plurality of power frequency periods can be collected at one time, and the sampling and storing time reaches more than hundreds of milliseconds. This results in complex post-implementation acquisition card equipment and great technical difficulty.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a high-speed data acquisition board for cable partial discharge signals, which can effectively solve the defects of short low-speed sampling measurement 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 of the present invention comprises a high-speed AD acquisition module, a data storage unit, a phase sensor for acquiring mains supply phase signals, a first partial discharge sensor, a second partial discharge sensor and a third partial discharge sensor for respectively acquiring ABC opposite 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, wherein a first partial discharge sensor is connected with a data storage unit through the first high-speed AD acquisition unit, a second partial discharge sensor is connected with the data storage unit through the second high-speed AD acquisition unit, a third partial 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 a 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 an 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 an 8GB large-capacity DDR3 memory.
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.
During operation, the first high-speed AD acquisition unit, the second high-speed AD acquisition unit and the third high-speed AD acquisition unit acquire partial discharge signals acquired by the first partial discharge sensor, the second partial discharge sensor and the third partial discharge sensor and then input into the data storage unit, meanwhile, the fourth high-speed AD acquisition unit acquires a phase signal of mains supply through the phase sensor and then inputs the phase signal of the mains supply into the phase identification unit, the phase identification unit carries out denoising and filtering processing on the phase signal, then carries out phase identification, and the data storage unit is controlled by the trigger control unit according to the identified phase so as to control the starting time of AD acquisition, and data in the data storage unit are input into the upper computer through the 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 the output signals of the partial discharge sensors corresponding to the three-phase power, and then the output signals are stored in the data storage unit, so that accurate synchronous judgment of the three-phase power discharge capacity is ensured. Meanwhile, the fourth high-speed AD acquisition unit is used for sampling the phase signal of the mains supply, so that the data volume is improved to the greatest extent, the processing scope is improved for subsequent phase processing, an accurate basis is provided for phase judgment, the phase error is ensured to be smaller 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, and the relation between the partial discharge signal and the phase of the mains supply is judged.
Furthermore, the data storage unit adopts an 8GB high-capacity DDR3 memory, can store continuous 1 second sampling data, ensures accurate judgment of partial discharge capacity of a plurality of continuous periods, and avoids error areas caused by accidental acquisition of a single power frequency period.
Drawings
Fig. 1 is a schematic structural view 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 identification 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 attached drawing figures:
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 mains phase signal, a first partial discharge sensor 101, a second partial discharge sensor 102 and a third partial discharge sensor 103 for respectively acquiring ABC phase 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, wherein 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 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 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.
In 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, and at the same time, the fourth high-speed AD acquisition unit 6 acquires a phase signal of the mains supply through the phase sensor 2, and then inputs the phase signal of the mains supply into the phase recognition unit 9, the phase recognition unit 9 performs denoising filtering processing on the phase signal, avoids the influence caused by load change and external electromagnetic interference, then performs phase recognition, and controls the data storage unit 7 through the trigger control unit 8 according to the recognized phase so as to control the starting time of the AD acquisition, and data in the data storage unit 7 is input into the upper computer 11 through the data transmission unit 10.
Specifically, the phase recognition unit 9 performs noise removal and filtering on the phase signal of the commercial power at first, the commercial power contains a large amount of interference signals in waveform due to load change and external electromagnetic interference, if phase recognition is required, the interference signals need to be filtered out and then an external power frequency synchronization technology is used, the data processing process is realized in the FPGA, an accurate basis is provided for phase judgment, and the phase error is ensured to be 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 two-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. The FPGA chip adopted by the high-speed AD acquisition module is 5CEFA5F23I7N, and the output signals of the corresponding partial discharge sensors of the three-phase power are synchronously sampled through the speed of the three channels 125M, so that the accurate synchronous judgment of the discharge amount of the three-phase power is ensured; and the fourth path samples the phase signal of the mains supply, so that the data quantity is improved to the maximum extent, and a processing margin is provided for subsequent phase processing.
The data storage unit 7 uses an 8GB large-capacity DDR3 memory, and the DDR3 memory adopts an MT41J128M16JT-125IT chip, so that temporary storage processing of acquired data is met. Sampling data of continuous 1 second are stored, accurate judgment of partial discharge capacity of continuous multiple periods is ensured, and in order to find the phase relation between partial discharge and mains supply phase, the acquisition time must be an integer multiple of the power frequency period; in order to avoid interpretation errors caused by the accidental discharge amplitude under the condition of only collecting one power frequency period, the collecting time reaches more than hundreds of milliseconds, and the continuity and the effectiveness of the collecting 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 triggering time and judge the relationship between the partial discharge signal and the mains supply phase.
The data transmission unit 10 uploads data to the upper computer 11 through the TCP protocol, and the 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 data, and the data in the data storage unit 7 is transmitted to the upper computer 11.
Claims (3)
1. The high-speed data acquisition board for the 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 supply 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), wherein 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 identification unit (9) through a 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 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);
the high-speed AD acquisition module is internally provided with an AD9608 chip and an FPGA chip;
the data storage unit (7) adopts an 8GB large-capacity DDR3 memory;
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), the partial discharge signals are input into the data storage unit (7), meanwhile, the fourth high-speed AD acquisition unit (6) acquires a phase signal of mains supply through the phase sensor (2), the phase signal of the mains supply is input into the phase identification unit (9), the phase identification unit (9) carries out denoising filtering processing on the phase signal, then carries out phase identification, and controls the data storage unit (7) through the trigger control unit (8) according to the identified phase so as to control the starting time of AD acquisition, and data in the data storage unit (7) are input into the upper computer (11) through the data transmission unit (10);
and 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.
2. The high-speed data acquisition board for cable partial discharge signals of claim 1, wherein the data transmission unit (10) is connected with the host computer (11) through TCP protocol.
3. The high-speed data acquisition board for cable partial discharge signals of claim 1, wherein the network chip used for the data transmission unit (10) is W5300.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN112394267A CN112394267A (en) | 2021-02-23 |
| CN112394267B true CN112394267B (en) | 2023-07-21 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4106253B2 (en) * | 2002-09-11 | 2008-06-25 | 株式会社東芝 | Partial discharge detector |
| CN105277907B (en) * | 2015-09-30 | 2018-09-21 | 国家电网公司 | A kind of site assessment system of partial discharge sensor |
| CN105467283B (en) * | 2015-12-04 | 2018-09-28 | 重庆臻远电气有限公司 | Local discharge signal harvester |
| 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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