CN202840459U - Alternating current signal collecting system of electric power automation monitor and protection device - Google Patents
Alternating current signal collecting system of electric power automation monitor and protection device Download PDFInfo
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- CN202840459U CN202840459U CN 201220518810 CN201220518810U CN202840459U CN 202840459 U CN202840459 U CN 202840459U CN 201220518810 CN201220518810 CN 201220518810 CN 201220518810 U CN201220518810 U CN 201220518810U CN 202840459 U CN202840459 U CN 202840459U
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Abstract
The utility model discloses an alternating current signal collecting system of an electric power automation monitor and protection device. The alternating current signal collecting system of the electric power automation monitor and protection device comprises a voltage and current conversion module, a filtration module, a channel switch module, an alternating current/ direct current (A/D) conversion module and a central processing unit (CPU) collecting module, wherein the voltage and current conversion module, the filtration module, the channel switch module, the A/D conversion module and the CPU colleting module are connected in sequence, and the CPU colleting module is connected with the channel switch module. The alternating current signal collecting system of the electric power automation monitor and protection device can meet requirements of the sampling performance of the electric power automation monitor and protection device in operation; requirements on A/D switch chips are reduced by the channel switch, so the cost is saved; the filtration module can effectively filter main interference on an industry spot, and the precision and the stability of an alternating current collected signal in electric power system protection are guaranteed.
Description
Technical field
The utility model relates to a kind of power automation monitoring and protecting device ac signal acquisition system.
Background technology
At present, there is following problem in the ac signal acquisition in the power automation monitoring and protecting device:
(1) measuring-signal and guard signal divide extracting, gathering, need more sampling channel number, and A/D conversion chip commonly used is generally 4 ~ 8 ALT-CH alternate channels;
(2) adopt 10,12 more A/D conversion chips, in the protection application of part, do not satisfy the required precision of sampling;
(3) the A/D sampled signal of industry spot is subject to anti-interference easily, causes signal distortion.
Summary of the invention
Technical problem to be solved in the utility model is; not enough for prior art; a kind of power automation monitoring and protecting device ac signal acquisition system is provided; satisfy the sampling performance requirement of existing power automation monitoring and protecting device; save cost; precision and the stability of the interchange collection signal in the protecting electrical power system are guaranteed in the effectively main interference of filtering industry spot.
For solving the problems of the technologies described above; the technical scheme that the utility model adopts is: a kind of power automation monitoring and protecting device ac signal acquisition system; comprise electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter and CPU acquisition module; described electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter, CPU acquisition module connect successively, and described CPU acquisition module is connected with described channel switching module.
Compared with prior art, the beneficial effect that has of the utility model is: the utility model can satisfy the sampling performance requirement of existing power automation monitoring and protecting device; Passage switches the demand that has reduced the A/D conversion chip, provides cost savings; Filtration module can effectively filtering industry spot main interference, guarantee precision and the stability of the interchange collection signal in the protecting electrical power system.
Description of drawings
Fig. 1 is the utility model one example structure block diagram;
Fig. 2 is the utility model one embodiment electric current and voltage modular converter and filtration module circuit theory diagrams.
Embodiment
As shown in Figure 1, the utility model one embodiment comprises electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter and CPU acquisition module, described electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter, CPU acquisition module connect successively, and described CPU acquisition module is connected with described channel switching module.
As shown in Figure 2, electric current of the present utility model, voltage changer convert the secondary current voltage signal to inner 3.53V AC signal.For the protection of power pack select 100A/3.53V, the power pack of be used for measuring is selected 8A/3.53V; Voltage changer is 120V/3.53V, wherein residual voltage converter using 200V/3.53V specification.Select the OP07 operational amplifier of AD company, designed conditioning and disturbance rejection that degenerative low-pass filter circuit is realized signal.At the input of amplifier, use two-way pressure-sensitive diode pair device to protect.
Channel switching module adopts the ADG409BR chip of AD company to realize the switching of AC signal passage and AD sampling channel, and electric current, the voltage signal of assurance homophase are changed simultaneously during the passage access.Chip selects 1 pattern for two 4, for 16 communication channels, and can be by twice switching, convert whole samplings three times.
The A/D modular converter has been selected the AD7656 chip, and this chip is the bipolarity entering apparatus, can by pin wire jumper selections ± 10V and ± two of 5V work range, switching rate is 250kSPS, is with parallel data grabbing card, can carry out simultaneously the data transaction of 6 passages.In order to guarantee the precision of AD sampling, select the ADR431BR power supply chip for the reference power supply that AD7656 provides sampling, in design, require simulation ground and digitally realize single-point grounding in the place near AD7656 simultaneously.
The CPU acquisition module has been selected the dsp chip TMS320F2812 of TI company, carries out the conversion and control of electronic switch switching, AD7656 by the Multifunctional mouth line, and carries out digital signal through 16 bit data ports and read.
Claims (4)
1. power automation monitoring and protecting device ac signal acquisition system; comprise electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter and CPU acquisition module; it is characterized in that; described electric current and voltage modular converter, filtration module, channel switching module, A/D modular converter, CPU acquisition module connect successively, and described CPU acquisition module is connected with described channel switching module.
2. power automation monitoring and protecting device ac signal acquisition according to claim 1 system is characterized in that, described channel switching module adopts the ADG409BR chip.
3. power automation monitoring and protecting device ac signal acquisition according to claim 1 system is characterized in that, described A/D modular converter adopts the AD7656BST chip.
4. power automation monitoring and protecting device ac signal acquisition according to claim 1 system is characterized in that, described CPU acquisition module adopts DSP TMS320F2812 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220518810 CN202840459U (en) | 2012-10-11 | 2012-10-11 | Alternating current signal collecting system of electric power automation monitor and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220518810 CN202840459U (en) | 2012-10-11 | 2012-10-11 | Alternating current signal collecting system of electric power automation monitor and protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202840459U true CN202840459U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220518810 Expired - Lifetime CN202840459U (en) | 2012-10-11 | 2012-10-11 | Alternating current signal collecting system of electric power automation monitor and protection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202840459U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938159A (en) * | 2016-06-28 | 2016-09-14 | 浙江涵普电力科技有限公司 | Method and system for realizing multi-loop voltage and multi-loop current synchronous sampling |
| CN107807208A (en) * | 2017-10-26 | 2018-03-16 | 北京科技大学 | A kind of gas alarm control system |
-
2012
- 2012-10-11 CN CN 201220518810 patent/CN202840459U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938159A (en) * | 2016-06-28 | 2016-09-14 | 浙江涵普电力科技有限公司 | Method and system for realizing multi-loop voltage and multi-loop current synchronous sampling |
| CN105938159B (en) * | 2016-06-28 | 2018-11-23 | 浙江涵普电力科技有限公司 | A kind of method and system for realizing multiloop voltage and multi-loop current synchronized sampling |
| CN107807208A (en) * | 2017-10-26 | 2018-03-16 | 北京科技大学 | A kind of gas alarm control system |
| CN107807208B (en) * | 2017-10-26 | 2020-06-26 | 北京科技大学 | Gas alarm control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |