CN108169548A - A kind of arrester on-Line Monitor Device - Google Patents
A kind of arrester on-Line Monitor Device Download PDFInfo
- Publication number
- CN108169548A CN108169548A CN201810085003.8A CN201810085003A CN108169548A CN 108169548 A CN108169548 A CN 108169548A CN 201810085003 A CN201810085003 A CN 201810085003A CN 108169548 A CN108169548 A CN 108169548A
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- module
- arrester
- circuit
- power supply
- detecting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention relates to a kind of arrester on-Line Monitor Device, including sample circuit, signal conditioning circuit, lightning stroke circuit for detecting, main control module, power supply module and display module；Sample circuit includes gas-discharge tube, capacitor, current-limiting resistance, sampling resistor and TVS pipe；Signal conditioning circuit acquires and improves the voltage signal at sampling resistor both ends；The lightning strike signals at lightning stroke circuit for detecting detecting real-time sampling resistor both ends；Voltage signal after signal conditioning circuit improves is carried out processing output while power supply module is controlled to power for signal conditioning circuit and carries out counting output to the lightning strike signals of lightning stroke circuit for detecting detecting by main control module；Display module shows the data of main control module output.Solve the problems, such as that existing arrester on-line monitoring device can not monitor 3kV and following AC and DC system leakage current of an arrester and action frequency; the blank of 3kV and following AC and DC system arrester on-line monitoring has been filled up, has improved the level of protection of more than 3kV AC and DC system arresters.
Description
Technical field
The present invention relates to a kind of arrester on-Line Monitor Devices, are mainly used for monitoring on-line the leakage current of arrester and move
Make number, be particularly suitable for on-line monitoring 3kV and following AC and DC system arrester, belonging to electric system on-line monitoring should
Use field.
Background technology
Overvoltage protection of the arrester as power equipment, the good and bad of performance play power equipment safety operation
Vital effect.In order to ensure arrester works normally, it is necessary to arrester be carried out by on-line monitoring equipment real-time
Monitoring.
It at present, can not be to the leakage of 3kV and following AC and DC system arrester using traditional lightning protection device on-line monitoring device
Electric current and action frequency are monitored on-line, the main reason is that：
1), the common voltage of urban track traffic DC power-supply system is DC1500V, and the lightning impulse of corresponding arrester is residual
Pressure is 4.8kV, and the residual voltage for matching monitor should not exceed 144V, and traditional arrester monitors device on-line, as shown in Figure 1,
Due to acquiring signal using zinc oxide resistance sheet, limited by material and technology, when monitor acts, zinc oxide resistance sheet both ends have
In the line, arrester will lose defencive function for the residual voltage of ≮ 2kV, such as concatenation；The range of traditional lightning protection device on-line monitoring device is all
It is mA ranks, resolution ratio is 0.05~0.1mA, and the starting leakage current of urban track traffic direct current arrester is only several
A uA.It can be seen that direct current arrester monitoring is also not achieved in the resolution ratio and measurement range of traditional lightning protection device on-line monitoring device
It is required that.
2), the lightning impulse residual voltage of 3kV AC systems arrester is 15kV, and the residual voltage for matching monitor should not exceed
450V, and traditional arrester on-line monitoring device, as shown in Figure 1, due to acquiring signal using zinc oxide resistance sheet, by material with
Technique limits, and when monitor acts, zinc oxide resistance sheet both ends have ≮ residual voltage of 2kV, such as in the line, arrester will lose concatenation
Deprotect function.
Invention content
The object of the present invention is to provide a kind of arrester on-Line Monitor Device, using new voltage limiting mode and data sampling side
Formula, 3kV and following AC and DC system leakage current of an arrester and action can not be monitored by solving existing arrester on-line monitoring device
The problem of number.
The particular technique solution of the present invention is as follows：A kind of arrester on-Line Monitor Device, is characterized in that：Packet
Include sample circuit, signal conditioning circuit, lightning stroke circuit for detecting, main control module, power supply module and display module；
Arrester is connected with sample circuit；
Above-mentioned sample circuit includes gas-discharge tube, capacitor, current-limiting resistance, sampling resistor and TVS pipe；
One end of current-limiting resistance and one end of gas-discharge tube connect, the other end of current-limiting resistance and one end of sampling resistor
Connection, the other end of sampling resistor and the other end of gas-discharge tube connect, and TVS pipe is connected in parallel on the both ends of sampling resistor, capacitance
Device is connected in parallel on the both ends of gas-discharge tube；
Above-mentioned signal conditioning circuit is used to acquire and improve the voltage signal at sampling resistor both ends；
Above-mentioned lightning stroke circuit for detecting is used for the lightning strike signals at detecting real-time sampling resistor both ends；
Above-mentioned signal conditioning circuit, lightning stroke circuit for detecting, power supply module and display module are connect with main control module, described
Main control module is letter for the voltage signal after signal conditioning circuit improves to be carried out processing output while controls power supply module
Number modulate circuit powers and carries out counting output to lightning strike signals；
Above-mentioned display module is used to show the data of main control module output.
When not having lightning stroke incident, gas-discharge tube is not turned on, and No leakage electric current flows through；Leakage current flows through current limliting
Resistance and sampling resistor can obtain voltage signal from sampling resistor both ends, because voltage signal very little, TVS pipe are not turned at this time,
No leakage electric current flows through.
When lightning stroke incident occurs, the voltage at sample circuit both ends increases rapidly, before gas-discharge tube conducting, passes through
The voltage of capacitor limited samples circuit is no more than 120V, and after gas-discharge tube conducting, the voltage of sample circuit is dropped to rapidly
Tens volts.
Preferably, in order to realize uA grades of leakage currents of monitoring, above-mentioned signal conditioning circuit includes operational amplifier.
Preferably, above-mentioned main control module includes interrupt module, A/D module, data processing module and output module；
Above-mentioned interrupt module is used to capture the lightning strike signals that lightning stroke circuit for detecting detects and be counted；Above-mentioned A/D module
For the voltage signal after signal conditioning circuit improves to be converted into digital signal；Above-mentioned data processing module is used for will be digital
Signal is converted to corresponding leakage current values；Above-mentioned output module is used to export leakage current values and number of lightning strokes count value.
Preferably, in order to save electricity consumption, above-mentioned power supply module is used for as master control module for power supply, when A/D module is run, master
It controls module control power supply module to power to operational amplifier, when A/D module is closed, master control module controls power supply module stops to fortune
Calculate amplifier power supply.
Preferably, above-mentioned power supply module is battery, including but not limited to disposable battery, rechargeable battery or solar-electricity
Pond.
Preferably, above-mentioned display module is liquid crystal display.
Preferably, above-mentioned main control module is ultra low-power microcontroller, and model includes but not limited to STM8L series or MSP430
Series.
Preferably, above-mentioned operational amplifier is low consumed power operational amplifier, and model includes but not limited to OPA348AID.
The beneficial effects of the invention are as follows：
1st, for the present invention by the way of gas-discharge tube shunt capacitor, substitution non-linear ZnO resistor piece carries out overvoltage
Protection, reduces the lightning impulse residual voltage of on-Line Monitor Device, has filled up 3kV and following AC and DC system is supervised online with arrester
The blank of survey, and improve the level of protection of more than 3kV AC and DC system arresters；
Non-linear ZnO resistor piece is due to the limitation of technique and material, lightning impulse residual voltage ≮ 2kV.The present invention uses
The mode of gas-discharge tube shunt capacitor carries out lightning impulse residual voltage limitation.In gas-discharge tube discharge process, only originating
Very short time in, residual voltage is about a few hectovolts, after discharge tube is connected, drops to tens volts rapidly.When lightning stroke incident occurs, adopt
The voltage at sample circuit both ends increases rapidly, before gas-discharge tube conducting, by the voltage of capacitor limited samples circuit not
More than 120V, after gas-discharge tube conducting, the voltage of sample circuit is dropped to rapidly tens volts.
2nd, the present invention uses the main control module using microcontroller as core, using A/D conversions and Digital Signal Processing, prison
The leakage current of arrester is surveyed, while leakage current data is shown using liquid crystal display, is leaked with the arrester for monitoring uA grades on-line
Electric current；
The present invention need to only choose the sampling resistor of suitable resistance value, so as to adjust sampled voltage, and using modulate circuit to adopting
Sample voltage is amplified, you can measures the leakage current of uA ranks.And traditional lightning protection device on-line monitoring device, due to using leakage electricity
Stream directly drives the mode of indicator type current meter, when leakage current is several uA, due to the limitation of technique, and so small electric current
It is difficult driving indicator type current meter.
3rd, by treated, the monitoring data such as leakage current are intuitively shown microcontroller by liquid crystal display, by observing liquid
Crystalline substance screen data can determine whether leakage current of an arrester size, further judge the aging conditions of arrester.
4th, microcontroller is powered operational amplifier control, is only powered when carrying out A/D conversions, saves electricity consumption.
5th, it is powered using battery, without external power supply, facilitates application.
Description of the drawings
Fig. 1 is the fundamental diagram that traditional lightning protection device monitors device on-line；
Fig. 2 is sample circuit fundamental diagram in one embodiment of the invention；
Fig. 3 is the structure diagram of the one of embodiment of the present invention；
Reference numeral is in figure：The mechanical count tables of 11-, 12- rectification modules, 13 count sampling module, the non-linear oxygen of 14-
Change zinc resistor disc, 15- current-limiting resistances, 16-TVS pipes, 17- indicator type current meters；
21- gas-discharge tubes, 23- sampling resistors, 24- capacitors.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, clear, complete description is carried out to the technical solution in the present invention, is shown
So, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, those of ordinary skill in the art's all other embodiments obtained without making creative work, belongs to
The scope of the present invention.
From figure 3, it can be seen that the present embodiment arrester on-Line Monitor Device mainly includes sample circuit, signal condition electricity
Road, lightning stroke circuit for detecting, main control module, power supply module and display module.
Figure it is seen that the sample circuit of the present embodiment replaced using 21 shunt capacitor 24 of gas-discharge tube it is non-thread
Property zinc oxide resistance sheet 14, current-limiting resistance 15 are connected with sampling resistor 23, and TVS pipe 16 is in parallel with sampling resistor 23, capacitor 24
The both ends of gas-discharge tube 21 are connected in parallel on, the input terminal of gas-discharge tube 21 is connect with the input terminal of current-limiting resistance 15, and gas is put
The output terminal of fulgurite 21 connect and is grounded with the output terminal of sampling resistor 23.
Main control module includes interrupt module, A/D module, data processing module and output module in the present embodiment；
Signal conditioning circuit includes operational amplifier, the input of A/D module in the output terminal and main control module of operational amplifier
End connection, the output terminal of A/D module and the input terminal of data processing module connect, output terminal and the output mould of data processing module
The input terminal connection of block；
The input terminal of interrupt module in the output terminal and main control module of circuit for detecting that is struck by lightning connects, the output terminal of interrupt module
It is connect with the input terminal of output module；
The output terminal of output module is connect with display module；
Power supply module is master control module for power supply, and when A/D module is run, master control module controls power supply module is to operation amplifier
Device is powered, and when A/D module is closed, master control module controls power supply module stops powering to operational amplifier.
During specific works, A/D module and data processing module cycling service, when not having lightning stroke incident, gas are controlled
Body discharge tube 21 is not turned on, and No leakage electric current flows through；Leakage current flows through current-limiting resistance 15 and sampling resistor 23, can be from sampling electricity
It hinders 23 both ends and obtains voltage signal, because voltage signal very little, TVS pipe 16 are not turned at this time, also No leakage electric current flows through.
The voltage signal at 23 both ends of sampling resistor is exported after operational amplifier improves to the A/D module of main control module, AD moulds
Block carries out analog-to-digital conversion to the voltage signal after conditioning, is exported after voltage signal is converted into digital signal to data processing mould
Block, data processing module handle digital signal, and digital signal is converted into after leakage current values and is sent out by output module
It send to display module and is shown, display module is liquid crystal display in this embodiment, can also be other in other embodiments
The display device of type.
When lightning stroke incident occurs, the voltage at sample circuit both ends increases rapidly, before the conducting of gas-discharge tube 21, leads to
The voltage for crossing 24 limited samples circuit of capacitor is no more than setting value, which can be by adjusting the capacitance tune of capacitor
Whole, the voltage value generally set is no more than 120V, and after gas-discharge tube 21 is connected, the voltage of sample circuit is reduced to tens volts.
While the lightning strike signals at 23 both ends of circuit for detecting detecting real-time sampling resistor of being struck by lightning, and pass through output module and be sent to display module
It is shown.
The conducting voltage U of gas-discharge tube 21 can be chosen in the present embodiment0=90V, the capacitance C=47uF of capacitor 24
=0.000047F, sampling resistor 23 resistance value R=1K, arrester nominal discharge current I=10kA=10000A；
When lightning stroke incident occurs, 21 voltage of gas-discharge tube is raised to 100 nanoseconds (t=not turned on after conducting voltage
0.00000001 second) in, the voltage increasing degree △ U of capacitor 24 are as follows：
△ U=I × t/C=10000 × 0.00000001/0.000047=21.3V
When then gas-discharge tube 21 is connected, the voltage U of capacitor 24 is as follows：
U=U0+ △ U=90+21.3=111.3V
Since I values are peak value 10kA here, and practical lightning current is to be raised to 10kA from 0, so practical capacitor
Voltage U should be less than 111.3V.
After gas-discharge tube 24 is connected, voltage drops to its residual voltage (being generally less than 90V) by 111.3V rapidly.
Claims (8)
1. a kind of arrester on-Line Monitor Device, it is characterised in that：Including sample circuit, signal conditioning circuit, lightning stroke detecting electricity
Road, main control module, power supply module and display module；
Arrester is connected with sample circuit；
The sample circuit includes gas-discharge tube (21), capacitor (24), current-limiting resistance (15), sampling resistor (23) and TVS
It manages (16)；
One end of current-limiting resistance (15) is connect with one end of gas-discharge tube (21), the other end and the sampling electricity of current-limiting resistance (15)
One end connection of (23) is hindered, the other end of sampling resistor (23) is connect with the other end of gas-discharge tube (21), and TVS pipe (16) is simultaneously
The both ends of sampling resistor (23) are associated in, capacitor (24) is connected in parallel on the both ends of gas-discharge tube (21)；
The signal conditioning circuit is used to acquire and improve the voltage signal at sampling resistor (23) both ends；
The lightning stroke circuit for detecting is used for the lightning strike signals at detecting real-time sampling resistor (23) both ends；
The signal conditioning circuit, lightning stroke circuit for detecting, power supply module and display module are connect with main control module, the master control
Module is signal tune for the voltage signal after signal conditioning circuit improves to be carried out processing output while controls power supply module
The power supply of reason circuit simultaneously carries out counting output to the lightning strike signals of lightning stroke circuit for detecting detecting；
The display module is used to show the data of main control module output.
2. arrester on-Line Monitor Device according to claim 1, it is characterised in that：The signal conditioning circuit includes fortune
Calculate amplifier.
3. arrester on-Line Monitor Device according to claim 2, it is characterised in that：The main control module includes interrupting mould
Block, A/D module, data processing module and output module；
The interrupt module is used to capture the lightning strike signals that lightning stroke circuit for detecting detects and be counted；The A/D module is used for
Voltage signal after signal conditioning circuit improves is converted into digital signal；The data processing module is used for digital signal
Be converted to corresponding leakage current values；The output module is used to export leakage current values and number of lightning strokes count value.
4. arrester on-Line Monitor Device according to claim 3, it is characterised in that：The power supply module is used for as master control
Module for power supply, when A/D module is run, master control module controls power supply module powers to operational amplifier, main when A/D module is closed
Module control power supply module is controlled to stop powering to operational amplifier.
5. arrester on-Line Monitor Device according to claim 4, it is characterised in that：The power supply module is battery, is wrapped
Include disposable battery, rechargeable battery or solar cell.
6. according to any arrester on-Line Monitor Devices of claim 1-5, it is characterised in that：The display module is liquid
Crystalline substance screen.
7. arrester on-Line Monitor Device according to claim 6, it is characterised in that：The main control module is micro energy lose list
Piece machine, model STM8L series or MSP430 series.
8. arrester on-Line Monitor Device according to claim 7, it is characterised in that：The operational amplifier is low-power consumption
Operational amplifier, model OPA348AID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810085003.8A CN108169548A (en) | 2018-01-29 | 2018-01-29 | A kind of arrester on-Line Monitor Device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810085003.8A CN108169548A (en) | 2018-01-29 | 2018-01-29 | A kind of arrester on-Line Monitor Device |
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| Publication Number | Publication Date |
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| CN108169548A true CN108169548A (en) | 2018-06-15 |
Family
ID=62515989
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| CN201810085003.8A Pending CN108169548A (en) | 2018-01-29 | 2018-01-29 | A kind of arrester on-Line Monitor Device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780231A (en) * | 2019-12-04 | 2020-02-11 | 沈阳铁道勘察设计院有限公司 | Leakage current monitoring equipment and method for segmented insulator |
| CN112595994A (en) * | 2020-12-31 | 2021-04-02 | 南京世都科技有限公司 | Lightning arrester leakage current measuring device |
| CN113945787A (en) * | 2021-10-11 | 2022-01-18 | 西安交通大学 | Digital zinc oxide arrester monitor capable of intermittently supplying power |
| CN114188918A (en) * | 2021-12-07 | 2022-03-15 | 长沙润迅通信设备有限公司 | SPD degradation intelligent monitoring protection device and method |
| CN116365460A (en) * | 2023-06-02 | 2023-06-30 | 国网四川省电力公司电力科学研究院 | Low-power-consumption self-powered arrester data acquisition circuit and arrester counter |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201007846Y (en) * | 2006-11-07 | 2008-01-16 | 西安神电电器有限公司 | On-line monitoring system for lightning arrester |
| CN101178838A (en) * | 2006-11-07 | 2008-05-14 | 西安神电电器有限公司 | Lightning arrestor on-line monitoring methods thereof system |
| CN201111702Y (en) * | 2007-10-12 | 2008-09-10 | 南京德闰电气有限公司 | Arrester leakage current telemetering device |
| CN104009456A (en) * | 2014-05-21 | 2014-08-27 | 国网四川省电力公司成都市新都供电分公司 | Lightning protection device for power transmission line monitoring system |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN204116485U (en) * | 2014-09-19 | 2015-01-21 | 陕西鑫盾科技有限公司 | A kind of lightning arrester lightning monitoring instrument |
| CN106505842A (en) * | 2016-10-19 | 2017-03-15 | 飞亚达（集团）股份有限公司 | Airborne DC source |
| CN206235654U (en) * | 2016-10-19 | 2017-06-09 | 北京动力源科技股份有限公司 | The input voltage measurement device and electronic equipment of a kind of high voltage converter |
| CN207832886U (en) * | 2018-01-29 | 2018-09-07 | 西安神电电器有限公司 | A kind of arrester on-Line Monitor Device |
-
2018
- 2018-01-29 CN CN201810085003.8A patent/CN108169548A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201007846Y (en) * | 2006-11-07 | 2008-01-16 | 西安神电电器有限公司 | On-line monitoring system for lightning arrester |
| CN101178838A (en) * | 2006-11-07 | 2008-05-14 | 西安神电电器有限公司 | Lightning arrestor on-line monitoring methods thereof system |
| CN201111702Y (en) * | 2007-10-12 | 2008-09-10 | 南京德闰电气有限公司 | Arrester leakage current telemetering device |
| CN104009456A (en) * | 2014-05-21 | 2014-08-27 | 国网四川省电力公司成都市新都供电分公司 | Lightning protection device for power transmission line monitoring system |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN204116485U (en) * | 2014-09-19 | 2015-01-21 | 陕西鑫盾科技有限公司 | A kind of lightning arrester lightning monitoring instrument |
| CN106505842A (en) * | 2016-10-19 | 2017-03-15 | 飞亚达（集团）股份有限公司 | Airborne DC source |
| CN206235654U (en) * | 2016-10-19 | 2017-06-09 | 北京动力源科技股份有限公司 | The input voltage measurement device and electronic equipment of a kind of high voltage converter |
| CN207832886U (en) * | 2018-01-29 | 2018-09-07 | 西安神电电器有限公司 | A kind of arrester on-Line Monitor Device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780231A (en) * | 2019-12-04 | 2020-02-11 | 沈阳铁道勘察设计院有限公司 | Leakage current monitoring equipment and method for segmented insulator |
| CN112595994A (en) * | 2020-12-31 | 2021-04-02 | 南京世都科技有限公司 | Lightning arrester leakage current measuring device |
| CN113945787A (en) * | 2021-10-11 | 2022-01-18 | 西安交通大学 | Digital zinc oxide arrester monitor capable of intermittently supplying power |
| CN114188918A (en) * | 2021-12-07 | 2022-03-15 | 长沙润迅通信设备有限公司 | SPD degradation intelligent monitoring protection device and method |
| CN116365460A (en) * | 2023-06-02 | 2023-06-30 | 国网四川省电力公司电力科学研究院 | Low-power-consumption self-powered arrester data acquisition circuit and arrester counter |
| CN116365460B (en) * | 2023-06-02 | 2023-08-18 | 国网四川省电力公司电力科学研究院 | Low-power-consumption self-powered arrester data acquisition circuit and arrester counter |
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