CN202583302U - Distribution network capacitance current testing device - Google Patents
Distribution network capacitance current testing device Download PDFInfo
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- CN202583302U CN202583302U CN 201220229498 CN201220229498U CN202583302U CN 202583302 U CN202583302 U CN 202583302U CN 201220229498 CN201220229498 CN 201220229498 CN 201220229498 U CN201220229498 U CN 201220229498U CN 202583302 U CN202583302 U CN 202583302U
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Abstract
The utility model discloses a distribution network capacitance current testing device. The device comprises a power supply module, and further comprises a signal output processing module for outputting a current signal to a to-be-tested system, a signal input processing module for receiving a feedback signal of the to-be-tested system, and a central signal processing module. The signal input processing module comprises a signal input sub-module, an active filter sub-module and a signal sampling sub-module; and the central processing module comprises a central processing sub-module and a frequency control sub-module. The distribution network capacitance current testing device with above structure can avoid contacting the primary equipment, and can improve the safety and the working efficiency during measurement.
Description
Technical field
The utility model power technology field especially relates to a kind of distribution capacitance current proving installation.
Background technology
The power supply neutral point of China's distribution system generally is not directly grounded at present, is the capacitance current that line mutual-ground capacitor produces so when the circuit single-phase earthing, flow through the electric current of trouble spot actual.According to statistics, the fault of power distribution network largely since during the circuit single-phase earthing electric capacity excessive and voluntarily blow-out cause.Therefore, the electric power rules of China regulations should be installed arc suppression coil with the building-out capacitor electric current when 10kV and 35kV system capacitive current during respectively greater than 30A and 10A, and this measures to make a decision the capacitance current of distribution with regard to requiring.In addition, the ground capacitance of power distribution network and the parameter of PT cooperate can produce the PT ferro-resonance over-voltage, whether PT resonance can take place and the resonance of what character takes place in order to verify this distribution system, also must accurately measure the ground capacitance value of power distribution network.The method of traditional measurement distribution capacitance current have Single Phase Metal ground connection direct method, add the electric capacity indirect method of measurement etc., but these methods all will touch primary equipment, thereby have that test is dangerous, trivial operations, shortcomings such as inefficiency.
The utility model content
The purpose of the utility model provides a kind of distribution capacitance current proving installation, can avoid contacting primary equipment, improves the security and the work efficiency of measuring process.
For realizing above-mentioned purpose; The utility model provides a kind of distribution capacitance current proving installation; Comprise power module; The utility model also comprises signal input processing module and the central signal processing module that is used for to the signal output processing module of treating the examining system output current signal, reception system feedback signal to be measured; Said signal input processing module comprises signal input submodule, active power filtering submodule and signal sampling submodule, and said central processing module comprises central processing sub and frequency control submodule.
Preferably, said signal output processing module comprises signal output sub-module, constant current source submodule and frequency transformation submodule.
Preferably, said central processing module is ADUC831BS-52 single-chip microcomputer U1.
Preferably, said central processing module also is connected to LCD MODULE and digital interface module.
Therefore, the utility model adopts the distribution capacitance current proving installation of said structure, can avoid contacting primary equipment, improves the security and the work efficiency of measuring process.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Fig. 1 is the modular structure synoptic diagram of the utility model distribution capacitance current proving installation embodiment;
Fig. 2 is the electrical block diagram of power module among the utility model distribution capacitance current proving installation embodiment;
Fig. 3 is the electrical block diagram of central processing module among the utility model distribution capacitance current proving installation embodiment;
Fig. 4 is the electrical block diagram of signal input processing module among the utility model distribution capacitance current proving installation embodiment;
Fig. 5 is the electrical block diagram of signal output processing module among the utility model distribution capacitance current proving installation embodiment;
Fig. 6 is the measuring principle figure of the utility model distribution capacitance current proving installation embodiment;
Fig. 7 is the measuring principle reduced graph of the utility model distribution capacitance current proving installation embodiment.
Embodiment
Embodiment
Fig. 1 is the modular structure synoptic diagram of the utility model distribution capacitance current proving installation embodiment; As shown in Figure 1; Comprise power module 4; Present embodiment also comprises signal input processing module 1 and the central signal processing module 3 that is used for to the signal output processing module 2 of treating the examining system output current signal, reception system feedback signal to be measured; Signal input processing module 1 comprises signal input submodule 11, active power filtering submodule 12 and signal sampling submodule 13, and central processing module 3 comprises central processing sub 3 and frequency control submodule 32, and frequency control submodule 32 is used to control present embodiment output current signal frequency.Central processing module 3 is selected ADUC831BS-52 single-chip microcomputer U1 for use.Signal output processing module 2 comprises signal output sub-module 21, constant current source submodule 22 and frequency transformation submodule 23; Directly measure the capacitance current of power distribution network through constant current source submodule 22 for treating the examining system power supply from the secondary side of PT; Compare with conventional test methods; This device need not directly to link to each other with primary side; Thereby the not dangerous property of test, need not to do numerous and diverse trouble free service and wait for tediously long traffic order, only need the open delta end that slotted line is connected to PT just can be measured the data of capacitance current.Because from the injection of PT open delta is faint alien frequencies test signal; So neither can produce any influence to relay protection and PT itself, avoided the power frequency interference signals of 50Hz again, the output terminal of tester can tolerate the alternating voltage of 100V simultaneously; If system has singlephase earth fault to take place when measuring; Also can not damage PT and tester, thereby need not to do special safety practice, make this work become safe, simple, quick.
Fig. 6 is the measuring principle figure of the utility model distribution capacitance current proving installation embodiment, and distribution capacitance current tester is the said distribution capacitance current of present embodiment proving installation among the figure, and is as shown in Figure 6; Present embodiment injects the electric current of an alien frequencies from the PT open delta; Be the alternating current of non-50Hz, purpose just induces an electric current that reduces by no-load voltage ratio like this in order to eliminate the interference of power-frequency voltage in the PT high-pressure side; This electric current is a zero-sequence current; Be that its size and Orientation at three-phase is identical, so it all can not circulate at power module and load side, can only be through PT and ground capacitance formation loop; So Fig. 6 can be reduced to Fig. 7 again, Fig. 7 is the measuring principle reduced graph of the utility model distribution capacitance current proving installation embodiment.Physical model according to Fig. 7 just can be set up corresponding mathematical model, just can measure three-phase ground capacitance value 3C through detecting measuring-signal
0, again according to formula I=3 ω C
0U
φ, U wherein
φBe the phase voltage of system under test (SUT), thereby can calculate the capacitance current of distribution network systems.
Therefore, the utility model adopts the distribution capacitance current proving installation of said structure, can avoid contacting primary equipment, improves the security and the work efficiency of measuring process.
What should explain at last is: above embodiment only in order to the explanation the utility model technical scheme but not limit it; Although the utility model has been carried out detailed explanation with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement the technical scheme of the utility model, also can not make amended technical scheme break away from the spirit and the scope of the utility model technical scheme and these are revised or be equal to replacement.
Claims (4)
1. distribution capacitance current proving installation; Comprise power module; It is characterized in that: also comprise the signal input processing module and the central signal processing module that are used for to the signal output processing module of treating the examining system output current signal, reception system feedback signal to be measured; Said signal input processing module comprises signal input submodule, active power filtering submodule and signal sampling submodule, and said central processing module comprises central processing sub and frequency control submodule.
2. distribution capacitance current proving installation according to claim 1 is characterized in that: said signal output processing module comprises signal output sub-module, constant current source submodule and frequency transformation submodule.
3. distribution capacitance current proving installation according to claim 2 is characterized in that: said central processing module is ADUC831BS-52 single-chip microcomputer U1.
4. distribution capacitance current proving installation according to claim 3 is characterized in that: said central processing module also is connected to LCD MODULE and digital interface module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229498 CN202583302U (en) | 2012-05-19 | 2012-05-19 | Distribution network capacitance current testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229498 CN202583302U (en) | 2012-05-19 | 2012-05-19 | Distribution network capacitance current testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202583302U true CN202583302U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220229498 Expired - Fee Related CN202583302U (en) | 2012-05-19 | 2012-05-19 | Distribution network capacitance current testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202583302U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548665A (en) * | 2016-03-07 | 2016-05-04 | 云南电网有限责任公司玉溪供电局 | Device and method for online testing capacitive current of power grid |
-
2012
- 2012-05-19 CN CN 201220229498 patent/CN202583302U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548665A (en) * | 2016-03-07 | 2016-05-04 | 云南电网有限责任公司玉溪供电局 | Device and method for online testing capacitive current of power grid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20140519 |