CN202093130U - Partial discharge online monitoring device for distributed cable - Google Patents
Partial discharge online monitoring device for distributed cable Download PDFInfo
- Publication number
- CN202093130U CN202093130U CN2011201573680U CN201120157368U CN202093130U CN 202093130 U CN202093130 U CN 202093130U CN 2011201573680 U CN2011201573680 U CN 2011201573680U CN 201120157368 U CN201120157368 U CN 201120157368U CN 202093130 U CN202093130 U CN 202093130U
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- operational amplifier
- circuit
- chip microcomputer
- input end
- monitoring device
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Abstract
The utility model discloses a partial discharge online monitoring device for a distributed cable; the partial discharge online monitoring device comprises a gate circuit, a filter and amplification frequency-mixing circuit, a single chip microcomputer and a display connected sequentially; the input end of the gate circuit is connected with a three-phase current signal; after improvement, a peak value detection circuit is arranged between the filter and amplification frequency-mixing circuit and the single chip microcomputer; the peak value detection circuit consists of two operational amplifiers; the in-phase input end of the first operational amplifier is connected with the output end of the filter and amplification frequency-mixing circuit, the output end of the first operational amplifier is connected with the in-phase input end of the second operational amplifier through a backflow-preventing diode, and the anti-phase input end of the first operational amplifier is grounded by a leakage resistor and an energy storage capacitor connected in parallel; the second operational amplifier is connected with a voltage follower; the output end of the second operational amplifier is connected with the single chip microcomputer. The peak value of the partial discharge signal is maintained in a certain period of time by using the peak value detection circuit, so that the high frequency partial discharge signal is converted into low frequency signal suitable for the single chip microcomputer acquisition, and the reliability of partial discharge monitoring is greatly improved.
Description
Technical field
The utility model relates to a kind of device that can carry out on-line monitoring to the partial discharges fault of high voltage supply cable, belongs to the detection technique field.
Background technology
Just there is place's cable splice in the general high voltage service cable for about per 300 meters, the cable splice of long-play under high voltage, big electric current (overload), reason such as being easy to because of cable itself or annex quality is poor, the cable splice construction quality does not pass a test, mechanical damage, the burn into annex that makes moist are aging causes insulation damages and shelf depreciation takes place, just further lead to major accident probably if can not get in time handling after the cable splice generation shelf depreciation, thereby have a strong impact on the safe and reliable operation of electric system, and cause enormous economic loss.Therefore be necessary the high voltage supply cable is carried out partial discharge monitoring.
In monitoring, because high-tension cable office discharge signal frequency is higher, disturb complexity, and the sample frequency of general monitoring device is lower, so still there is certain difficulty in the sampling of office's discharge signal, this has influenced office to a great extent and has put monitoring effect.In addition, cable line generally reaches several kilometers even tens of kilometer, and the quantity of monitoring point is many and disperse, so the transmission of monitoring information and gather also relatively difficulty.Based on above reason, also there is not a instrument to carry out on-line monitoring to the partial discharges fault of high-tension cable easily and effectively at present.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of distribution cable office of effectively Monitoring High Voltage Cable local discharge signal to be placed on the line monitoring device.
Problem described in the utility model realizes with following technical proposals:
A kind of distribution cable office is placed on the line monitoring device, by the gating circuit that connects successively, mixting circuit is amplified in filtering, single-chip microcomputer and display are formed, three input ends of gating circuit are gathered the three-phase current signal of high-tension cable respectively by three current transformers, after the improvement, between filtering amplification mixting circuit and single-chip microcomputer, peak-detector circuit is set, described peak-detector circuit is made up of two operational amplifiers, the in-phase input end of first operational amplifier connects filtering and amplifies the output terminal of mixting circuit and be provided with below-center offset resistance, its output terminal connects the in-phase input end of second operational amplifier through the anti-backflow diode, and its inverting input is through the bleeder resistance and the storage capacitor ground connection of parallel connection; Second operational amplifier is connected into voltage follower, and its output terminal connects the analog to digital conversion input port of single-chip microcomputer.
Above-mentioned distribution cable office is placed on the line monitoring device, also comprises the GPRS wireless transport module in the formation, and described GPRS wireless transport module connects the signal output port of single-chip microcomputer.
Above-mentioned distribution cable office is placed on the line monitoring device, described filtering is amplified mixting circuit and is made up of first wave filter, first amplifier, frequency mixer, second wave filter and second amplifier that connect successively, the output terminal of the input end selecting circuit passband of first wave filter, the in-phase input end of output termination first operational amplifier of second amplifier.
The utility model utilizes peak-detector circuit that the peak value of innings discharge signal is maintained within a certain period of time, be converted to and be suitable for the low frequency signal that single-chip microcomputer is gathered thereby will amplify high frequency office discharge signal that mixting circuit handled, improved the reliability that monitoring is put in office greatly through filtering.This circuit utilizes office's information of putting that the GPRS wireless transport module will gather to be sent to host computer, for the transmission of monitoring information with gather the condition of providing convenience.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is an electric theory diagram of the present utility model;
Fig. 2 is an electrical schematic diagram.
Each label is among the figure: U1, single-chip microcomputer; LCD, display; GPRS, wireless transmission mould; C, storage capacitor; R1 below-center offset resistance; R2, bleeder resistance; F1, first operational amplifier; F2, second operational amplifier; D, anti-backflow diode; CTA, CTB, CTC, current sensor; XT, gating circuit; LB1, first wave filter; LB2, second wave filter; FD1, first amplifier; FD2, second amplifier; HP, frequency mixer.
Embodiment
Referring to Fig. 2, the utility model is made up of threephase current transformer CTA, CTB and CTC, gating circuit XT, the first wave filter LB1, the first amplifier FD1, frequency mixer HP, the second wave filter LB2, the second amplifier FD2, peak-detector circuit, single-chip microcomputer U1, LCD LCD and GPRS wireless transport module.Wherein, peak-detector circuit is made up of below-center offset resistance R 1, bleeder resistance R2, the first operational amplifier F1, the second operational amplifier F2, anti-backflow diode D.This circuit can select to monitor frequency band automatically, and data collection cycle is adjustable; Adopt peak-detector circuit to realize the low-frequency sampling of single-chip microcomputer U1.Realize the wireless transmission of data by the GPRS wireless transport module.
Utilize peak-detector circuit to realize that the principle of low-frequency sampling is: the first operational amplifier F1 and the second operational amplifier F2 all are connected into voltage follower, office's discharge signal enters the first operational amplifier F1 by in-phase input end, deliver to the in-phase input end of the second operational amplifier F2 then by the output terminal of the first operational amplifier F1, finally export and send into the AD input end of single-chip microcomputer U1 by the second operational amplifier F2.When the in-phase input end magnitude of voltage of the first operational amplifier F1 during greater than the conduction voltage drop (0.7V) of anti-backflow diode D, anti-backflow diode D conducting, anti-backflow this moment diode D cathode voltage is lower than anode (i.e. the electrode that is connected with the output terminal of the first operational amplifier F1) magnitude of voltage 0.7V, storage capacitor C begins charging, because anti-backflow diode D cathode voltage is as the feedback voltage of the first operational amplifier F1, so final anti-backflow diode D cathode voltage equals the voltage of the first operational amplifier F1 in-phase input end, after the voltage of the first operational amplifier F1 in-phase input end begins to descend, because storage capacitor C is to the maintenance effect of electric weight, voltage on the storage capacitor C can slowly descend under the effect of bleeder resistance R2, thereby the anti-backflow diode D cathode voltage and the second operational amplifier F2 output end voltage are also slowly descended thereupon, reach the purpose of holding signal peak value.
The power supply unit of this circuit can adopt the power taking mutual inductor to obtain electric energy from the cable of operation, also can use powered battery.
Claims (3)
1. a distribution cable office is placed on the line monitoring device, it is by the gating circuit (XT) that connects successively, mixting circuit is amplified in filtering, single-chip microcomputer (U1) and display (LCD) are formed, wherein, three input ends of gating circuit (XT) are gathered the three-phase current signal of high-tension cable respectively by three current transformers, it is characterized in that, between filtering amplification mixting circuit and single-chip microcomputer (U1), peak-detector circuit is set, described peak-detector circuit is made up of two operational amplifiers, wherein, the in-phase input end of first operational amplifier (F1) connects filtering and amplifies the output terminal of mixting circuit and be provided with below-center offset resistance (R1), its output terminal connects the in-phase input end of second operational amplifier (F2) through anti-backflow diode (D), and its inverting input is through the bleeder resistance (R2) and storage capacitor (C) ground connection of parallel connection; Second operational amplifier (F2) is connected into voltage follower, and its output terminal connects the analog to digital conversion input port of single-chip microcomputer (U1).
2. be placed on the line monitoring device according to the described distribution cable of claim 1 office, it is characterized in that, also comprise the GPRS wireless transport module in the formation, described GPRS wireless transport module connects the signal output port of single-chip microcomputer (U1).
3. be placed on the line monitoring device according to claim 1 or 2 described distribution cable offices, it is characterized in that, described filtering is amplified mixting circuit and is made up of first wave filter (LB1), first amplifier (FD1), frequency mixer (HP), second wave filter (LB2) and second amplifier (FD2) that connect successively, the output terminal of the input end selecting circuit passband (XT) of first wave filter (LB1), the in-phase input end of output termination first operational amplifier (F1) of second amplifier (FD2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201573680U CN202093130U (en) | 2010-12-31 | 2011-05-17 | Partial discharge online monitoring device for distributed cable |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020694540.1 | 2010-12-31 | ||
| CN201020694540 | 2010-12-31 | ||
| CN2011201573680U CN202093130U (en) | 2010-12-31 | 2011-05-17 | Partial discharge online monitoring device for distributed cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093130U true CN202093130U (en) | 2011-12-28 |
Family
ID=45368190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201573680U Expired - Fee Related CN202093130U (en) | 2010-12-31 | 2011-05-17 | Partial discharge online monitoring device for distributed cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093130U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646819A (en) * | 2013-12-13 | 2014-03-19 | 成都旭顺电子有限责任公司 | Vacuum switch vacuum degree on-line monitoring system |
| CN103713240A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | High-precision wireless cable partial discharge detector |
| CN110554293A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | partial discharge signal processing device |
-
2011
- 2011-05-17 CN CN2011201573680U patent/CN202093130U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713240A (en) * | 2012-10-08 | 2014-04-09 | 四川金信石信息技术有限公司 | High-precision wireless cable partial discharge detector |
| CN103646819A (en) * | 2013-12-13 | 2014-03-19 | 成都旭顺电子有限责任公司 | Vacuum switch vacuum degree on-line monitoring system |
| CN103646819B (en) * | 2013-12-13 | 2015-07-29 | 成都旭顺电子有限责任公司 | A kind of vacuum degree of vacuum switch on-line monitoring system |
| CN110554293A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | partial discharge signal processing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20160517 |