CN202502198U - Data acquisition device used for three-phase capacitor partial discharge on-line monitoring system - Google Patents
Data acquisition device used for three-phase capacitor partial discharge on-line monitoring system Download PDFInfo
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- CN202502198U CN202502198U CN2012201074333U CN201220107433U CN202502198U CN 202502198 U CN202502198 U CN 202502198U CN 2012201074333 U CN2012201074333 U CN 2012201074333U CN 201220107433 U CN201220107433 U CN 201220107433U CN 202502198 U CN202502198 U CN 202502198U
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Abstract
The utility model relates to a data acquisition device used for a three-phase capacitor partial discharge on-line monitoring system. The on-line monitoring system comprises a current sensor and a demodulation conditioning unit. The data acquisition device includes an acquisition card, a data access module and an acquisition and display module, wherein the acquisition card is connected with the current sensor through the demodulation conditioning unit, the acquisition and display module is connected with the acquisition card through the data access module. Compared with the prior art, the data acquisition device used for the three-phase capacitor partial discharge on-line monitoring system of the utility model has the advantages of high accuracy of signal acquisition, high operation speed and the like.
Description
Technical field
The utility model relates to a kind of data collector of electric field, especially relates to a kind of data collector that is used for three-phase capacitor partial discharge monitoring system.
Background technology
For three-phase capacitor partial discharge monitoring system, data collector is extremely important.Can the performance of data collector influences signal to a great extent obtain exactly, and the travelling speed of data processor also affects the work efficiency of this monitoring system.Research about the related data acquisition system (DAS) of three-phase capacitor partial discharge monitoring system has caused people's attention.
For example; Application number is: 201110193173.6; The applying date is: on July 12nd, 2011, invention and created name is " based on the capacitor on-line monitoring system of partial discharge monitoring ", and this application case discloses a kind of system; Comprise plurality of sensors, amplifier and signal processing unit, A/D converting unit, control and treatment and display unit.Related data collector is the A/D capture card, and A/D resolution is 8.Solved the problem that general data collector exists to a great extent, but accuracy, the integrality obtained at signal, and aspect such as travelling speed shortcoming to some extent also.
The utility model content
The purpose of the utility model is exactly that the accuracy that provides a kind of signal to obtain for the defective that overcomes above-mentioned prior art existence is high, the data collector that is used for three-phase capacitor partial discharge monitoring system that travelling speed is fast.
The purpose of the utility model can realize through following technical scheme:
A kind of data collector that is used for three-phase capacitor partial discharge monitoring system; Described on-line monitoring system comprises current sensor and detection conditioning unit; It is characterized in that; Described data collector comprises capture card, data access module and collection display module, and described capture card connects current sensor through detection conditioning unit, and described collection display module connects capture card through data access module.
Described capture card is provided with four-way, and wherein three passages receive the local discharge signal of three-phase capacitors, and another passage receives synchronous power frequency component.
Described capture card is the DS03064 capture card, and the bandwidth of described passage is 60MHz.
Described capture card is a dma mode.
The storage depth of described data access module is 10K, and be 0.1mS storage time.
Described collection display module is provided with the Labview platform.
Compared with prior art, the utlity model has following advantage:
1) channel bandwidth is 60MHz, and with current sensor, the frequency band range of amplifier matches, and the sampling rate of 200MS/s has guaranteed accurately obtaining of signal in real time.
2) capture card is a dma mode, makes that the transmission speed of data is faster.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: the 1-local discharge signal, the 2-current sensor, 3-detection conditioning unit, the 4-capture card, 5-gathers display module, 6-data access module.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1; A kind of data collector that is used for three-phase capacitor partial discharge monitoring system; On-line monitoring system comprises current sensor 2 and detection conditioning unit 3; Data collector comprises capture card 4, data access module 6 and gathers display module 5 that capture card 4 connects current sensor 2 via detection conditioning unit 3, gathers display module 5 and connects capture card 4 via data access module 6.
Capture card 4 is provided with four-way, and wherein three passages receive the local discharge signal 1 of three-phase capacitors, and another passage receives synchronous power frequency component; Capture card 4 is the DS03064 capture card; Its parameter is: bandwidth: 60MHz (3dB), resolution: 8bits, the rise time: 5.8ns; The bandwidth of passage is 60MHz, matches with the frequency band range of sensor, amplifier; Capture card is a dma mode, and when dma mode was gathered, storer descended through the direct swap data of CPU with being located at dma controller control outward, and does not need the totalizer transfer, can improve data rate to a great extent.Gather display module 5 and be provided with the Labview platform.
Owing to be the three-phase real time on-line monitoring; Capture card 4 supports four-way to work simultaneously; Therefore four passages can be set and gather simultaneously, satisfy the capture card trigger condition after, the requirement that three-phase local discharge signal 1 and operating frequency phase signal are gathered simultaneously; Compare the binary channels collection, it is more convenient that follow-up data is handled.
Because front end is provided with signal amplifier, the signal of millivolt level have been amplified 20 times, and considered the influence of range measuring accuracy, therefore the acquiescence measurement range is set is 500mV.
Characteristic with reference to shelf depreciation in capacitive equipments such as transformer; The main energy band of shelf depreciation concentrates on low-frequency band; Consider the bandwidth of sensor simultaneously; The sampling rate of capture card 4 is set to 100MS/s, just can guarantee the integrality of local discharge signal 1 at the signal below the time domain reductase 12 0MHz according to aromatic sampling law like this.
The storage depth of capture card 4 is the bigger the better in theory, can keep in more data like this, guarantees the integrality of data; Give follow-up data processing with time enough simultaneously, but excessive internal memory can influence device rate and cost, considers under the sampling rate of 100MS/s; For partial discharge pulse (microsecond level), the storage depth of 0.1K just can write down one or more complete pulse signal, but in order to obtain phase information as far as possible accurately; Consider the speed of program run; The storage depth that therefore each passage is set is 10K, stores 0.1 millisecond, the i.e. data of 1/200 power frequency.
The triggering mode of capture card 4 is selected software trigger, and trigger value is set to 50% in advance, the mode of using the edge to trigger, and A, B, C three-phase take turns as the triggering source, the foundation that adopts amplitude to differentiate as pulse.Promptly as A during mutually as the source of triggering, when the pulse amplitude that occurs mutually as A was higher than the activation threshold value that A is provided with mutually, capture card 4 beginning image data also stored in its buffer memory.The reading of data from capture card 4 that setting program continues, it is whole that capture card 4 reads when not being triggered is zero.
Claims (3)
1. data collector that is used for three-phase capacitor partial discharge monitoring system; Described on-line monitoring system comprises current sensor and detection conditioning unit; It is characterized in that; Described data collector comprises capture card, data access module and collection display module, and described capture card connects current sensor through detection conditioning unit, and described collection display module connects capture card through data access module.
2. a kind of data collector that is used for three-phase capacitor partial discharge monitoring system according to claim 1 is characterized in that described capture card is provided with four-way.
3. a kind of data collector that is used for three-phase capacitor partial discharge monitoring system according to claim 2 is characterized in that described capture card is the DS03064 capture card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201074333U CN202502198U (en) | 2012-03-20 | 2012-03-20 | Data acquisition device used for three-phase capacitor partial discharge on-line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012201074333U CN202502198U (en) | 2012-03-20 | 2012-03-20 | Data acquisition device used for three-phase capacitor partial discharge on-line monitoring system |
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| Publication Number | Publication Date |
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| CN202502198U true CN202502198U (en) | 2012-10-24 |
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| CN2012201074333U Expired - Lifetime CN202502198U (en) | 2012-03-20 | 2012-03-20 | Data acquisition device used for three-phase capacitor partial discharge on-line monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103440761A (en) * | 2013-09-10 | 2013-12-11 | 国家电网公司 | Online monitoring method and system for dielectric loss of capacitive type device |
| CN105699868A (en) * | 2016-03-08 | 2016-06-22 | 北京华天机电研究所有限公司 | Online monitoring system for power grid |
-
2012
- 2012-03-20 CN CN2012201074333U patent/CN202502198U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103440761A (en) * | 2013-09-10 | 2013-12-11 | 国家电网公司 | Online monitoring method and system for dielectric loss of capacitive type device |
| CN105699868A (en) * | 2016-03-08 | 2016-06-22 | 北京华天机电研究所有限公司 | Online monitoring system for power grid |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |
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| CX01 | Expiry of patent term |