CN105652063B - Insulator leakage current for laboratory monitors system - Google Patents
Insulator leakage current for laboratory monitors system Download PDFInfo
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- CN105652063B CN105652063B CN201510362928.9A CN201510362928A CN105652063B CN 105652063 B CN105652063 B CN 105652063B CN 201510362928 A CN201510362928 A CN 201510362928A CN 105652063 B CN105652063 B CN 105652063B
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- 239000012212 insulator Substances 0.000 title claims abstract description 47
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Abstract
A kind of insulator leakage current for laboratory provided by the invention monitors system, including for acquiring insulator leakage current current acquisition unit, with the connection of current acquisition unit output end transmission unit is isolated, the data acquisition unit that transmission unit connects and the monitoring host computer connecting with the data acquisition unit is isolated with described；The current acquisition unit output end is provided with protection location；On the one hand the leakage current of insulator surface can be accurately detected, reliable analysis is carried out conducive to the working condition to insulator, on the other hand monitoring system can be effectively protected, guarantees the operation of monitoring system lasting stability, prolongs the service life.
Description
Technical field
The present invention relates to a kind of power equipment monitoring system more particularly to a kind of insulator leakage currents for laboratory
Monitoring system.
Background technique
In a humidity environment, insulator surface pollution layer becomes wet due to being influenced by humid air, so as to cause
The leakage current of insulator surface increases, so that the electrical strength of insulator be caused to be decreased obviously, improves the generation of pollution flashover accident
Rate seriously threatens the operational safety of electric system, therefore, most important for the monitoring of insulator leakage current.
In the prior art, anti-interference is poor to be had following defects that for the leakage current of laboratory inner insulator, caused most
The leakage current signal burr monitored eventually is more, and monitoring system is caused to report an error, to cause to report by mistake, influences the performance to insulator
Analysis；Service life is short, and the damage of monitoring device is be easy to cause when flashover occurs in insulator surface.
It is, therefore, desirable to provide a kind of new insulator leakage current for laboratory monitors system, it on the one hand can be quasi-
The really leakage current of detection insulator surface carries out reliable analysis conducive to the working condition to insulator, on the other hand can be right
Monitoring system is effectively protected, and is guaranteed the operation of monitoring system lasting stability, is prolonged the service life.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of insulator leakage current monitoring system for laboratory, one
Aspect can accurately detect the leakage current of insulator surface, carry out reliable analysis conducive to the working condition to insulator, another
Monitoring system can be effectively protected in aspect, guarantee the operation of monitoring system lasting stability, prolong the service life.
A kind of insulator leakage current for laboratory provided by the invention monitors system, including for acquiring insulator
The current acquisition unit of leakage current is isolated transmission unit, transmission is isolated with described with current acquisition unit output end connection
The data acquisition unit of unit connection and the monitoring host computer being connect with the data acquisition unit；The current acquisition unit is defeated
Outlet is provided with protection location.
Further, the current acquisition unit is noninductive resistance R1, and one end of the noninductive resistance R1 is connect with insulator,
Other end ground connection, one end that the noninductive resistance R1 is connect with insulator are output end.
Further, the isolation transmission unit is photoelectrical coupler, and the input terminal of the photoelectrical coupler passes through shielding letter
Number line is connect with current acquisition unit, and the output end of the photoelectrical coupler and the input terminal of data acquisition unit connect.
Further, the protection location includes TVS diode D1, controllable silicon SCR 1, resistance R2, potentiometer RW1, resistance
R3, resistance R4 and comparator U1, the anode of the controllable silicon SCR 1 are connect with the output end of current acquisition unit, and cathode connects
The control electrode on ground, the controllable silicon SCR 1 is connect with the output end of comparator U1, a termination power of the resistance R2, resistance R2
The other end be grounded by potentiometer RW1, the points of common connection of the potentiometer RW1 and resistance R2 and the in-phase end of comparator U1
Connection, the cathode of the TVS diode D1 connect with the output end of current acquisition unit, the TVS diode D2 positive and
One end of resistance R3 connects, and the other end of resistance R3 is grounded by resistance R4, the points of common connection of the resistance R3 and resistance R4
It is connect with the reverse side of comparator U1.
Further, the protection location further includes indicating circuit, and the indicating circuit includes triode Q1, current-limiting resistance
The base stage of R5, capacitor C1 and light emitting diode D2, the triode Q1 are connected to the points of common connection of resistance R4 and resistance R3,
The collector of triode Q1 connects power supply by current-limiting resistance R5, and the emitter of triode Q1 and the anode of light emitting diode D2 connect
It connects, the cathode ground connection of light emitting diode D2, the both ends the capacitor C1 connect to form parallel-connection structure with the both ends of resistance R4 respectively.
Further, the input terminal of the data acquisition unit is provided with acquisition protection circuit, the acquisition protection circuit
Structure is identical as the structure of protection location.
Further, the data acquisition unit is data collecting card.
Beneficial effects of the present invention: system, a side are monitored provided by the present invention for the insulator leakage current in laboratory
Face can accurately detect the leakage current of insulator surface, carry out reliable analysis, another party conducive to the working condition to insulator
Monitoring system can be effectively protected in face, guarantee the operation of monitoring system lasting stability, prolong the service life.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is the circuit diagram of protection location of the invention.
Fig. 3 is leakage current curves figure of the invention.
Specific embodiment
Fig. 1 is invention's principle block diagram, and Fig. 2 is circuit diagram of the invention, as shown, one kind provided by the invention
For laboratory insulator leakage current monitor system, including for acquiring insulator leakage current current acquisition unit,
With current acquisition unit output end connection be isolated transmission unit, with it is described be isolated transmission unit connect data acquisition unit with
And the monitoring host computer being connect with the data acquisition unit；The current acquisition unit output end is provided with protection location, wherein
Data acquisition unit uses data collecting card；Provided by the present invention for laboratory insulator leakage current monitor system, one
Aspect can accurately detect the leakage current of insulator surface, carry out reliable analysis conducive to the working condition to insulator, another
Monitoring system can be effectively protected in aspect, guarantee the operation of monitoring system lasting stability, prolong the service life.
In the present embodiment, the current acquisition unit is noninductive resistance R1, one end of the noninductive resistance R1 and insulator
Connection, other end ground connection, one end that the noninductive resistance R1 is connect with insulator are output end, by this structure, can be incited somebody to action
The leakage current signal of insulator is converted into voltage signal, and precision is high, conducive to the accuracy of monitoring result.
In the present embodiment, the isolation transmission unit is photoelectrical coupler, and the input terminal of the photoelectrical coupler passes through screen
Signal wire is covered to connect with current acquisition unit, the output end of the photoelectrical coupler and the input terminal of data acquisition unit connect,
By this structure, on the one hand effectively interference phenomenon present in shielded signal transmission process can on the other hand enable to
Electrical isolation is realized in the high tension loop connecting with insulator and the low tension loop connecting with data collecting card, and input terminal believes output
Number without influence, strong antijamming capability, the operation is stable, long service life, efficiency of transmission is high.
In the present embodiment, the protection location includes TVS diode D1, controllable silicon SCR 1, resistance R2, potentiometer RW1, electricity
Resistance R3, resistance R4 and comparator U1, the anode of the controllable silicon SCR 1 are connect with the output end of current acquisition unit, and cathode connects
The control electrode on ground, the controllable silicon SCR 1 is connect with the output end of comparator U1, a termination power of the resistance R2, resistance R2
The other end be grounded by potentiometer RW1, the points of common connection of the potentiometer RW1 and resistance R2 and the in-phase end of comparator U1
Connection, the cathode of the TVS diode D1 connect with the output end of current acquisition unit, the TVS diode D2 positive and
One end of resistance R3 connects, and the other end of resistance R3 is grounded by resistance R4, the points of common connection of the resistance R3 and resistance R4
It is connect with the reverse side of comparator U1, when flashover high pressure occurs in insulator surface, TVS diode D1 is breakdown, resistance R3 and electricity
Resistance R4 obtains electric current and divides, and the partial pressure value on resistance R4 is input in comparator U1, and resistance R2 and potentiometer RW1 carry out base
Quasi- voltage setting (reference voltage may be set to 0 or the other values greater than 0), the partial pressure value on resistance R4 are greater than the benchmark electricity of setting
Pressure value, then comparator U1 exports high level, so that controllable silicon SCR 1 is connected, so that short circuit is carried out to noninductive resistance R1, to electric current
Acquisition unit carries out good protection, and realizes good protection to subsequent circuit, prolongs the service life.
In the present embodiment, the protection location further includes indicating circuit, and the indicating circuit includes triode Q1, current limliting electricity
Resistance R5, capacitor C1 and light emitting diode D2, the base stage of the triode Q1 are connected to the commonly connected of resistance R4 and resistance R3
The collector of point, triode Q1 connects power supply, the emitter of triode Q1 and the anode of light emitting diode D2 by current-limiting resistance R5
Connection, the cathode ground connection of light emitting diode D2, the both ends the capacitor C1 connect to form parallel-connection structure with the both ends of resistance R4 respectively,
After flashover occurs, after TVS diode D1 is breakdown, capacitor C1 is electrically charged, when the voltage of capacitor C1 reaches leading for triode Q1
Be powered pressure, and triode Q1 conducting, light emitting diode D2 shines, refers to enter guard mode to current protection location
Show, according to the bright light number of light emitting diode D2, conducive to the statistics to flashover frequency, to be conducive to letting out for insulator surface
Leakage current is analyzed comprehensively, and passes through the effect of capacitor C1, good time-lag action can be played, so that controllable silicon SCR 1 is being dodged
Delay a period of time closes after network occurs, and further ensures that the safety of whole system.
In the present embodiment, the input terminal of the data acquisition unit is provided with acquisition protection circuit, the acquisition protection electricity
The structure on road and the structure of protection location are identical, by this structure, can be conducive to carry out good protection to data collecting card.
Leakage current curves figure as shown in Figure 3, Cong Tuzhong can be clearly seen that the electric current acquired through the invention is believed
Number curve smoothing, disturb very little, accurately have recorded the wet local arc that generates of insulator surface to flashover whole process
Leakage current variation, to substantially increase accuracy.
In addition, protection circuit and noninductive resistance R1 can be arranged one to improve the accuracy of final detection result
In a shielding case body, and shielding case body is grounded, to realize the interference for preventing extraneous electromagnetic signals from source.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (5)
1. a kind of insulator leakage current for laboratory monitors system, it is characterised in that: including being let out for acquiring insulator
The current acquisition unit of leakage current, with current acquisition unit output end connection be isolated transmission unit, with it is described be isolated transmit singly
The data acquisition unit of member connection and the monitoring host computer being connect with the data acquisition unit；The current acquisition unit output
End is provided with protection location；The protection location includes TVS diode D1, controllable silicon SCR 1, resistance R2, potentiometer RW1, resistance
R3, resistance R4 and comparator U1, the anode of the controllable silicon SCR 1 are connect with the output end of current acquisition unit, and cathode connects
The control electrode on ground, the controllable silicon SCR 1 is connect with the output end of comparator U1, one end of the resistance R2 and current acquisition list
The output end connection of member, the other end of resistance R2 are grounded by potentiometer RW1, the public company of the potentiometer RW1 and resistance R2
Contact is connect with the in-phase end of comparator U1, and the cathode of the TVS diode D1 is connect with the output end of current acquisition unit, institute
The anode for stating TVS diode D1 is connect with one end of resistance R3, and the other end of resistance R3 is grounded by resistance R4, the resistance R3
It is connect with the points of common connection of resistance R4 with the reverse side of comparator U1；
The protection location further includes indicating circuit, the indicating circuit include triode Q1, current-limiting resistance R5, capacitor C1 and
The base stage of light emitting diode D2, the triode Q1 are connected to the points of common connection of resistance R4 and resistance R3, the collection of triode Q1
Electrode connects power supply by current-limiting resistance R5, and the emitter of triode Q1 is connect with the anode of light emitting diode D2, light emitting diode
The cathode of D2 is grounded, and the both ends the capacitor C1 connect to form parallel-connection structure with the both ends of resistance R4 respectively.
2. the insulator leakage current for laboratory monitors system according to claim 1, it is characterised in that: the electric current
Acquisition unit is noninductive resistance R1, and one end of the noninductive resistance R1 is connect with insulator, other end ground connection, the noninductive resistance
One end that R1 is connect with insulator is output end.
3. the insulator leakage current for laboratory monitors system according to claim 1, it is characterised in that: the isolation
Transmission unit is photoelectrical coupler, and the input terminal of the photoelectrical coupler is connect by shielded signal line with current acquisition unit,
The output end of the photoelectrical coupler and the input terminal of data acquisition unit connect.
4. the insulator leakage current for laboratory monitors system according to claim 1, it is characterised in that: the data
The input terminal of acquisition unit is provided with acquisition protection circuit, the structure and the structure phase of protection location of the acquisition protection circuit
Together.
5. according to claim 1 or 4 insulator leakage currents for laboratory monitor system, it is characterised in that: described
Data acquisition unit is data collecting card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510362928.9A CN105652063B (en) | 2015-06-26 | 2015-06-26 | Insulator leakage current for laboratory monitors system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510362928.9A CN105652063B (en) | 2015-06-26 | 2015-06-26 | Insulator leakage current for laboratory monitors system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105652063A CN105652063A (en) | 2016-06-08 |
| CN105652063B true CN105652063B (en) | 2019-04-23 |
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| CN201510362928.9A Active CN105652063B (en) | 2015-06-26 | 2015-06-26 | Insulator leakage current for laboratory monitors system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581748A (en) * | 2009-06-24 | 2009-11-18 | 西安工程大学 | Zinc oxide arrester on-line monitoring system |
| CN101603994A (en) * | 2009-06-04 | 2009-12-16 | 西安交通大学 | A kind of on-line monitoring device of metallic oxide arrester |
| CN201518411U (en) * | 2009-10-19 | 2010-06-30 | 东莞市阿利恩电子有限公司 | Novel overvoltage protector |
| CN203967748U (en) * | 2014-07-04 | 2014-11-26 | 安徽金力电气技术有限公司 | Secondary over-voltage protector for current transformer |
| CN104734132A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Automatic lightning arrester working abnormity alarm circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54121175A (en) * | 1978-03-10 | 1979-09-20 | Matsushita Electric Works Ltd | Leak detector |
-
2015
- 2015-06-26 CN CN201510362928.9A patent/CN105652063B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603994A (en) * | 2009-06-04 | 2009-12-16 | 西安交通大学 | A kind of on-line monitoring device of metallic oxide arrester |
| CN101581748A (en) * | 2009-06-24 | 2009-11-18 | 西安工程大学 | Zinc oxide arrester on-line monitoring system |
| CN201518411U (en) * | 2009-10-19 | 2010-06-30 | 东莞市阿利恩电子有限公司 | Novel overvoltage protector |
| CN203967748U (en) * | 2014-07-04 | 2014-11-26 | 安徽金力电气技术有限公司 | Secondary over-voltage protector for current transformer |
| CN104734132A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Automatic lightning arrester working abnormity alarm circuit |
Non-Patent Citations (1)
| Title |
|---|
| 覆冰绝缘子闪络过程泄漏电流监测设计与实现;蒋兴良、曹娟;《高电压技术》;20030831;第29卷(第08期);第1-2节 |
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| CN105652063A (en) | 2016-06-08 |
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Effective date of registration: 20231030 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: Chongqing University Address before: No. 2 Tianhe South 2nd Road, Guangzhou City, Guangdong Province, 510410 Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. Patentee before: Chongqing University |
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