CN203849322U - Low voltage power supply surge protector resistive current monitoring device - Google Patents
Low voltage power supply surge protector resistive current monitoring device Download PDFInfo
- Publication number
- CN203849322U CN203849322U CN201420232836.XU CN201420232836U CN203849322U CN 203849322 U CN203849322 U CN 203849322U CN 201420232836 U CN201420232836 U CN 201420232836U CN 203849322 U CN203849322 U CN 203849322U
- Authority
- CN
- China
- Prior art keywords
- module
- surge protector
- current
- resistance
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a low voltage power supply surge protector resistive current monitoring device. The device comprises a leakage current monitoring module, a differential amplifier module, a low pass filtering module, an A/D conversion module and a terminal processing module, wherein the leakage current monitoring module, the differential amplifier module, the low pass filtering module, the A/D conversion module and the terminal processing module are successively connected. The leakage current monitoring module detects the leakage current of a surge protector through an outer integral Rogowski coil. Through an outer integral resistor R1, a current signal is converted into a voltage signal. The voltage signal is amplified by the differential amplifier module. A high frequency interference signal is removed by the low pass filter. An acquired analog signal is converted into a digital signal through the A/D conversion module, and the digital signal is sent into the terminal processing module. The device can directly determine division resistive current in the leakage current of the low voltage power supply surge protector. Extracting the working voltage of the surge protector in normal operation is not needed. Resistive current can be safely and accurately acquired, and the operation state of the surge protector can be diagnosed.
Description
Technical field:
The utility model relates to a kind of low-tension supply surge protector current in resistance property monitoring device, belongs to electronics, electrical equipment monitoring field.
Background technology:
The major function of surge protector (SPD) is the induced overvoltage of restriction because being struck by lightning and causing, makes it to be reduced to below the withstand voltage of protected equipment.But the core component ZnO varistor of SPD in the course of the work; because surge current impacts; self make moist and all kinds of superpotential effect; inevitably exist aging deteriorated; this will cause the continuous increase of surge protector current in resistance property; thereby cause surge protector temperature rise, likely can cause self catching fire, cause serious consequence.Therefore, the current in resistance property of surge protector is carried out to on-line monitoring and there is important safe meaning.
To realize by penalty method and third harmonic method mostly to the on-line monitoring of low-tension supply surge protector current in resistance property at present, a kind of Resistive Current of Metal Oxide Surge Arrester extracting method of for example patent (application number: 201010288860.1) voltage signal is carried out to fast fourier transform and obtain each harmonic amplitude and phase place, obtain but amplitude proportional capacity current signal identical with arrester capacity current waveform according to the voltage each harmonic amplitude of the phase relation of voltage signal on electric capacity and current signal and acquisition and phase place, obtain again the current in resistance property of lightning arrester according to arrester resistance current and the orthogonal principle of capacity current.And patent Zinc-Oxide Arrester on-Line Monitor Device (application number: 201320119648.1) by the leakage current of monitoring Zinc-oxide piezoresistor, thereby calculate the representation parameter of third harmonic numerical value as current in resistance property, realize the assessment to voltage dependent resistor (VDR) performance.But all there is shortcoming separately in above-mentioned two kinds of methods; penalty method must be measured the current in resistance property of surge protector under off-line state; and must under specific voltage, measure, this condition of work with surge protector reality has larger difference, and this will cause measuring inaccurate.And third harmonic method presents nonlinear effect within the scope of specific current amplitude, in addition because supply voltage exists frequency jitter, can cause measuring the error that existence is larger.
Summary of the invention:
The purpose of this utility model is to provide a kind of low-tension supply surge protector current in resistance property monitoring device; this low-tension supply surge protector current in resistance property monitoring device can safer and accurately extract the current in resistance property in surge protector operational process, and this device can be applicable to the on-line monitoring of low-tension supply surge protector.
The utility model is achieved through the following technical solutions:
This device comprises the leakage current monitoring module, differential amplification module, low-pass filtering module, A/D modular converter and the terminal processing module that connect successively;
Leakage current monitoring module: comprise outer integration Luo-coil and outer integrating resistor R1;
Differential amplification module: comprise operational amplifier IC1 and resistance R 2～R5;
Low-pass filtering module: the capacitor C 1 and the resistance R 6 that comprise mutual series connection;
Leakage current monitoring module is surveyed the leakage current of surge protector by outer integration Luo-coil; by outer integrating resistor R1; current signal is changed into voltage signal; this voltage signal carries out signal amplification through differential amplification module; remove the undesired signal of high frequency by low-pass filter; pass through afterwards A/D modular converter, the simulating signal collecting is converted to digital signal, send into terminal processing module.
As a kind of improvement of the present utility model, outer integrating resistor R1 is serially connected between two taps of outer integration Luo-coil, between the negative input end of one end that resistance R 2 is serially connected in outer integrating resistor R1 with operational amplifier IC1, between the positive input terminal of the other end that resistance R 3 is serially connected in outer integrating resistor R1 with operational amplifier IC1, resistance R 4 is serially connected between the negative input end and output terminal of operational amplifier IC1; The positive input terminal of one end concatenation operation amplifier IC1 of resistance R 5, other end ground connection; The common port of capacitor C 1 one terminating resistor R6 and A/D conversion module, other end ground connection; The output terminal of A/D modular converter connects terminal processing module.
Further design of the present utility model is, the chip of A/D modular converter is that 8 high-speed a/ds of ADC0804 transform chip, 6 pin of this chip are connected with differential amplification module VIN (+) and VIN (-) respectively with 7 pin, and the resistance R 7 of also connecting between VIN (+) and 6 pin, VIN (-) is ground connection simultaneously.
Further design of the present utility model is, the skeleton of outer integration Luo-coil is annular.
Outer integration Luo-coil skeleton adopts cirque structure to be convenient to install.
Further design of the present utility model is, the internal diameter a=300mm of outer integration Luo-coil, and external radius b=360mm, the wire diameter of coiling is 1mm, the number of turn is 2000 circles.
Adopt the utility model of this structure, current acquisition speed responsive is fast, highly sensitive, bandwidth, detection range of current are large.
Further design of the present utility model is, the high-gain dual operational amplifier that operational amplifier IC1 is LM358.
The utility model has the following advantages compared to existing technology:
1, the utility model can directly be determined the current in resistance property of low-tension supply surge protector; operating voltage when not needing to extract surge protector and normally moving; thereby can be safer, accurately obtain current in resistance property, thus the running status of diagnosis surge protector.
2, the utlity model has the advantages such as current acquisition speed responsive is fast, highly sensitive, bandwidth, detection range of current is large, circuit is easy for installation.
3, the utility model can effectively amplify the fine leak electric current that outer integration Luo-coil gathers, and effectively suppresses common mode interference, has advantages of high anti-jamming capacity.
Brief description of the drawings:
Fig. 1 is theory structure block diagram of the present utility model;
Fig. 2 is the structural representation of Luo-coil;
Fig. 3 is the structural representation of differential amplifier circuit;
Fig. 4 is the structural representation of low-pass filter;
Fig. 5 is the structural representation of A/D change-over circuit;
Fig. 6 is the processing flow chart of terminal processing module.
Embodiment:
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Embodiment mono-:
As shown in Figure 1, this low-tension supply surge protector current in resistance property monitoring device comprises the leakage current monitoring module, differential amplification module, low-pass filtering module, A/D modular converter and the terminal processing module that connect successively.Leakage current monitoring module comprises outer integration Luo-coil and outer integrating resistor R1; Differential amplification module comprises operational amplifier IC1 and resistance R 2～R5; Low-pass filtering module comprises capacitor C 1 and the resistance R 6 of mutual series connection.
Leakage current monitoring module is surveyed the microampere order leakage current of surge protector by outer integration Luo-coil; by outer integrating resistor R1; current signal is changed into voltage signal; this voltage signal carries out signal amplification through differential amplification module; remove the undesired signal of high frequency by low-pass filter; pass through afterwards A/D modular converter; the simulating signal collecting is converted to digital signal; send into terminal processing module and carry out time delay overlap-add procedure, isolate the real-time waveform of surge protector current in resistance property by the processing of each submodule in terminal module.
The Luo-coil that in the utility model, leakage current monitoring module adopts can be as shown in Figure 2, for the ease of installing, the skeleton of coil is selected cirque structure, the inside and outside radius of coil is respectively a=300mm, b=360mm, the wire diameter of coiling is 1mm, and the number of turn is that 2000 circles (can also do to change according to actual conditions, might not be only limited to this size by body size design.)。Owing to not there is not the problem that magnetic core is saturated, this coil measurement range is wide, and current measuring range is little of the μ A order of magnitude.The value of outer integrating resistor R1 is 1 Ω, and this resistance is serially connected between two taps of Luo-coil, for the current signal of induction is converted to voltage signal.
Differential amplification module in the utility model can be as shown in Figure 3, operational amplifier IC1 adopts the high-gain dual operational amplifier that model is LM358, between the negative input end of one end that resistance R 2 is serially connected in outer integrating resistor R1 with operational amplifier IC1, between the positive input terminal of the other end that resistance R 3 is serially connected in outer integrating resistor R1 with operational amplifier IC1, resistance R 4 is serially connected between the negative input end and output terminal of operational amplifier IC1; The positive input terminal of one end concatenation operation amplifier IC1 of resistance R 5, other end ground connection.The value of resistance R 2-R5 is all 10k Ω, and said elements forms high impedance differential amplifier circuit, the upper outer integrating resistor R1 weak voltage signals gathering effectively can be amplified, and suppress common mode interference, thereby facilitate late-class circuit to process.
As shown in Figure 4, resistance R 6 is connected between the output terminal of operational amplifier IC1 and the input end of A/D conversion module low-pass filtering module in the utility model, the common port of capacitor C 1 one terminating resistor R6 and A/D conversion module, other end ground connection.Resistance R 6 and capacitor C 1 form passive low ventilating filter, and its major function is the high frequency interference composition in filtered signal, ensure the normal transmission of voltage signal.
A/D modular converter in the utility model as shown in Figure 5.A/D conversion chip adopts 8 high-speed a/ds that model is ADC0804 to transform chip, 6 pin of this chip are connected with differential amplification module VIN (+) and VIN (-) respectively with 7 pin, and the resistance R 7 of also connecting between VIN (+) and 6 pin.In the time of 7 pin ground connection, the voltage of 6 pin VIN (+) ends is analog input voltage.The resistance R 7 of connecting between VIN (+) and input voltage is 10k Ω, and its effect is the electric current of restriction VIN (+) end, prevents that electric current is excessive and burns A/D chip.And 11～18 pin are as output terminal, export 8 position digital signals of DB1～DB8, the output terminal of A/D modular converter connects terminal processing module.
Embodiment bis-:
As shown in Figure 6, the leakage current monitoring signal after A/D conversion is the total current of low-tension supply surge protector of flowing through to the waveform processing process flow diagram of the terminal processing module in the utility model, and this signal will be sent into terminal processing module and process.Circuital function expression is f (t), and first this signal, through frequency sonding module, can extract the frequency f of signal, afterwards signal frequency f is sent into time delay module, time delay time T of time delay Module Generation
d=1/ (4f).Full current signal f (t) and time delay time T
d=1/ (4f) inputs phase shift block simultaneously, exports after treatment delay time signal f (t-T
d).This delay time signal f (t-T
d) send into electric current laminating module with full current signal f (t) and superpose, obtain time delay superposed signal f (t)+f (t-T
d).This signal passes through time to peak detecting module afterwards, time T when output time delay superposed signal arrives peaking
p.When total current signal f (t) arrives time to peak T
ptime, its value f (T
p) be also the maximal value of current in resistance property.And the time arrives T
d+ T
ptime, the value f (T of total current signal
p+ T
d) corresponding be the maximal value of capacity current.Because the fundamental component of capacity current is identical with time delay superposed signal, the value that therefore can determine capacity current is sin[ω (t-T
p)+π], by total current signal f (t) and capacity current signal sin[ω (t-T
p)+π] subtract each other after sending into current in resistance property separation module, can isolate current in resistance property f (t)-sin[ω (t-T
p)+π], thus realize the real time on-line monitoring to low-tension supply surge protector current in resistance property.
Claims (6)
1. a low-tension supply surge protector current in resistance property monitoring device, is characterized in that: this device comprises the leakage current monitoring module, differential amplification module, low-pass filtering module, A/D modular converter and the terminal processing module that connect successively;
Leakage current monitoring module: comprise outer integration Luo-coil and outer integrating resistor R1;
Differential amplification module: comprise operational amplifier IC1 and resistance R 2～R5;
Low-pass filtering module: the capacitor C 1 and the resistance R 6 that comprise mutual series connection;
Leakage current monitoring module is surveyed the leakage current of surge protector by outer integration Luo-coil; by outer integrating resistor R1; current signal is changed into voltage signal; this voltage signal carries out signal amplification through differential amplification module; remove the undesired signal of high frequency by low-pass filter; pass through afterwards A/D modular converter, the simulating signal collecting is converted to digital signal, send into terminal processing module.
2. low-tension supply surge protector current in resistance property monitoring device according to claim 1, it is characterized in that: outer integrating resistor R1 is serially connected between two taps of outer integration Luo-coil, between the negative input end of one end that resistance R 2 is serially connected in outer integrating resistor R1 with operational amplifier IC1, between the positive input terminal of the other end that resistance R 3 is serially connected in outer integrating resistor R1 with operational amplifier IC1, resistance R 4 is serially connected between the negative input end and output terminal of operational amplifier IC1; The positive input terminal of one end concatenation operation amplifier IC1 of resistance R 5, other end ground connection; The common port of capacitor C 1 one terminating resistor R6 and A/D conversion module, other end ground connection, the output terminal of A/D conversion module connects terminal processing module.
3. low-tension supply surge protector current in resistance property monitoring device according to claim 1; it is characterized in that: 8 high-speed a/ds that the chip of described A/D modular converter is ADC0804 transform chip; 6 pin of this chip and 7 pin respectively with differential amplification module VIN(+) and VIN (-) be connected; and the resistance R 7 of also connecting between VIN (+) and 6 pin, VIN (-) is ground connection simultaneously.
4. low-tension supply surge protector current in resistance property monitoring device according to claim 1, is characterized in that: the skeleton of described outer integration Luo-coil is annular.
5. low-tension supply surge protector current in resistance property monitoring device according to claim 4, is characterized in that: the internal diameter a=300mm of outer integration Luo-coil, and external radius b=360mm, the wire diameter of coiling is 1mm, the number of turn is 2000 circles.
6. low-tension supply surge protector current in resistance property monitoring device according to claim 1, is characterized in that: the high-gain dual operational amplifier that described operational amplifier IC1 is LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420232836.XU CN203849322U (en) | 2014-05-07 | 2014-05-07 | Low voltage power supply surge protector resistive current monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420232836.XU CN203849322U (en) | 2014-05-07 | 2014-05-07 | Low voltage power supply surge protector resistive current monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203849322U true CN203849322U (en) | 2014-09-24 |
Family
ID=51562323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420232836.XU Expired - Fee Related CN203849322U (en) | 2014-05-07 | 2014-05-07 | Low voltage power supply surge protector resistive current monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203849322U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459280A (en) * | 2014-12-19 | 2015-03-25 | 南京信息工程大学 | Method for extracting resistance current of metal oxide arrester (MOA) |
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
| CN106199162A (en) * | 2015-05-08 | 2016-12-07 | 中兴通讯股份有限公司 | The testing circuit of a kind of high-side current and detection method |
| CN107144745A (en) * | 2017-05-08 | 2017-09-08 | 台州学院 | A kind of intelligent on-line detection method of low-tension supply Surge Protector performance |
| CN108241097A (en) * | 2016-12-26 | 2018-07-03 | 中国电信股份有限公司 | Surge protector device for detecting performance and method |
| CN108746970A (en) * | 2018-03-30 | 2018-11-06 | 南京绥德自动焊接装备有限公司 | Current sensing means for medium frequency inverter electric resistance welding system |
| CN108872747A (en) * | 2018-06-27 | 2018-11-23 | 南京信息工程大学 | Surge protector current in resistance property extraction element and its method based on related coefficient |
| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN112924898A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Inside full current measuring device of metal oxide arrester |
-
2014
- 2014-05-07 CN CN201420232836.XU patent/CN203849322U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459280A (en) * | 2014-12-19 | 2015-03-25 | 南京信息工程大学 | Method for extracting resistance current of metal oxide arrester (MOA) |
| CN106199162A (en) * | 2015-05-08 | 2016-12-07 | 中兴通讯股份有限公司 | The testing circuit of a kind of high-side current and detection method |
| CN106093543A (en) * | 2016-06-07 | 2016-11-09 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current cables leakage current electrification detection system |
| CN108241097A (en) * | 2016-12-26 | 2018-07-03 | 中国电信股份有限公司 | Surge protector device for detecting performance and method |
| CN108241097B (en) * | 2016-12-26 | 2020-12-08 | 中国电信股份有限公司 | Surge protector performance detection device and method |
| CN107144745A (en) * | 2017-05-08 | 2017-09-08 | 台州学院 | A kind of intelligent on-line detection method of low-tension supply Surge Protector performance |
| CN108746970A (en) * | 2018-03-30 | 2018-11-06 | 南京绥德自动焊接装备有限公司 | Current sensing means for medium frequency inverter electric resistance welding system |
| CN108872747A (en) * | 2018-06-27 | 2018-11-23 | 南京信息工程大学 | Surge protector current in resistance property extraction element and its method based on related coefficient |
| CN108872747B (en) * | 2018-06-27 | 2023-07-04 | 南京信息工程大学 | Surge protector resistive current extraction device and method based on correlation coefficient |
| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN112924898A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Inside full current measuring device of metal oxide arrester |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203849322U (en) | Low voltage power supply surge protector resistive current monitoring device | |
| CN205562653U (en) | Current inducer | |
| CN102156241B (en) | On-line monitoring unit for leakage current of zinc oxide arrester | |
| CN205982509U (en) | Hollow parallel reactor turn -to -turn short circuit on -line monitoring system of dry -type | |
| CN203759086U (en) | Iron core grounding current online monitoring device | |
| CN206114790U (en) | Zinc oxide arrester on -line monitoring device | |
| CN205193212U (en) | Insulating detecting system of DC cable | |
| CN107192445B (en) | Strong vibration sensor circuit for high-voltage circuit breaker and signal acquisition system | |
| CN103969523A (en) | Device capable of automatically monitoring performance of voltage limiting type surge protection device | |
| CN108089092A (en) | A kind of generator amature winding earth detector | |
| CN204228942U (en) | The line fault observation circuit of current transformer | |
| CN109932619B (en) | Secondary signal collector of electronic sensor of power distribution network | |
| CN104076193B (en) | A kind of overvoltage harvester based on Zinc-oxide piezoresistor | |
| CN204666751U (en) | A kind of Zinc-Oxide Arrester on-Line Monitor Device based on dsp chip | |
| CN203732610U (en) | Current detection device | |
| CN204807615U (en) | Leakage current of an arrester signal pickup assembly | |
| CN202182911U (en) | Automatic gain regulating current detection circuit of low voltage soft starter | |
| CN203519717U (en) | H type filtering capacitor bank imbalance current detection apparatus | |
| CN202502131U (en) | Voltage/current detecting circuit | |
| CN204989380U (en) | Join in marriage net PT fuse fault monitoring and diagnostic system | |
| CN111122170B (en) | High-precision resistance signal conditioning circuit and method based on current source | |
| CN104330762A (en) | Line fault detection circuit for current transformer | |
| CN204116446U (en) | A kind of voltage for high voltage converter and frequency measuring equipment | |
| CN210294383U (en) | High-precision direct-current metering signal sampling circuit | |
| CN207817126U (en) | A kind of generator amature winding earth detector |
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: 20140924 Termination date: 20160507 |