CN102156241A - On-line monitoring unit for leakage current of zinc oxide arrester - Google Patents
On-line monitoring unit for leakage current of zinc oxide arrester Download PDFInfo
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- CN102156241A CN102156241A CN2011101443624A CN201110144362A CN102156241A CN 102156241 A CN102156241 A CN 102156241A CN 2011101443624 A CN2011101443624 A CN 2011101443624A CN 201110144362 A CN201110144362 A CN 201110144362A CN 102156241 A CN102156241 A CN 102156241A
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 25
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 229960001296 zinc oxide Drugs 0.000 claims description 22
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 10
- 238000004080 punching Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 241000052343 Dares Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
An on-line monitoring unit for leakage current of a zinc oxide arrester comprises a zinc oxide valve block, a rectification circuit, a current mutual inductor, a sampling resistor, a signal conditioning circuit and a CC2430 chip, wherein the original edge coil of the current mutual inductor is serially connected between the rectification circuit and ground; the secondary edge coil is connected to the sampling resistor in parallel; the voltage input end of the signal conditioning circuit is connected to two ends of the sampling resistor; the signal output end of the signal conditioning circuit is connected to the difference sampling signal input end of the CC2430 chip. The inventor has the courage to break through the traditional prejudice, and daringly connects the original edge of a precise current mutual inductor between the rectification circuit and ground directly and serially; the current mutual inductor can measure a weak leakage current less than 0.02mA; the precision reaches 0.2 level, and the electric signal is strong; the precision requirements to the following filter amplifying circuit are reduced; the phase of the output signal of the filter amplifying circuit and the phase of the original edge current are ensured to be the same; the calculation accuracy of the resistive currents is improved; the current mutual inductor is not destroyed by high voltage; and unexpected effect is obtained.
Description
Technical field
The present invention relates to a kind of Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit.
Background technology
The leakage current of lightning arrester is a key character amount of judging the lightning arrester running status in the transformer station.Arrester on-line monitoring system need be sampled to leakage current, in the hope of obtaining the resistive component and the capacitive component of leakage current.
The leakage current sampling method mainly contains following several in the general arrester on-line monitoring system:
(1) small voltage signalling.This method is to obtain the small voltage signal at the two ends of electric leakage counter, and the resistance divided by counter obtains full current signal then.Adopt this method to necessarily require the voltage signal at counter two ends linear, could guarantee to obtain correct current waveform with the current signal that flows through counter.But general counter can not meet this requirement, and this method has bigger limitation.
(2) utilize active or passive punching CT to obtain the current signal method.This method is that the down conductor with lightning arrester passes this punching CT, and the electric current that utilizes the leakage current of lightning arrester to induce at the CT secondary side is used for measuring.But the leakage current of lightning arrester generally very little (being lower than 5mA mostly), make that the making of sensor is very difficult, subsequent conditioning circuit need increase accurate filter amplification circuit, the output signal of filter amplification circuit and primary current be same-phase no longer, bring very mistake for the calculating of current in resistance property, even lose the possibility of calculating current in resistance property.
(3) series resistor (or electric capacity) power taking stream signalling.This method is that the down conductor of lightning arrester is opened, and connect resistance or electric capacity obtain leakage current values by the magnitude of voltage on resistance or the electric capacity.This method has changed the mode of connection of original lightning arrester, and the scene does not generally allow, and in order to prevent that lightning current from causing damage to resistance or electric capacity, the ratio that the thermal capacity of resistance and electric capacity will be selected is higher, and the volume of equipment also will be bigger.
Summary of the invention
The present invention wants the technical solution problem to be: overcomes the shortcoming of prior art, a kind of Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit is provided, but the leakage current of sensitive measurement lightning arrester, and cheap for manufacturing cost.
The technical solution adopted for the present invention to solve the technical problems is as follows: Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit, composition comprises: zinc oxide valve plate, rectification circuit, the leakage current indicating gauge, discharge counter, it is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, the CC2430 chip, and power unit, the primary coil of described current transformer is serially connected with between rectification circuit and the ground, secondary coil is in parallel with sampling resistor, the voltage input end of signal conditioning circuit is connected to described sampling resistor two ends, and the signal output part of signal conditioning circuit is connected with the difference sampled signal input end of CC2430 chip.
Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring of the present invention unit is to improve to form on the basis of existing traditional leakage current indication and counter.The present invention directly is connected in series (series connection) between rectification circuit and ground with the former limit of current transformer, when leakage current takes place, current transformer sampled leakage electric current also is translated into voltage form, through signal conditioning circuit filtering higher hamonic wave and high-frequency interferencing signal, filtered signal is done the difference sampling for the CC2430 chip, and outwards sends.Because the former limit of current transformer is to be connected in the circuit, therefore small leakage current still can be detected, monitoring sensitivity is high, has solved the difficult problem that minute leakage electric current for a long time can't accurately record.
In light current (low pressure) field, detecting electric current by series current mutual inductor in circuit is comparatively common technological means, yet in forceful electric power (high pressure) field, but never used these means, main cause is the electric current that is connected on current transformer in the lightning arrester major loop several thousand even tens kiloamperes when being difficult to bear the lightning arrester action.Between above-mentioned reason, the technician adopts punching CT to obtain the leakage current of lightning arrester more, yet result of use is unsatisfactory, and this problem is perplexing the technician for a long time, becomes a great problem that hinders the lightning arrester monitoring of working condition.The present inventor dares to breaking through traditional prejudice, the bold former limit with the precision current mutual inductor directly is connected in series (series connection) between rectification circuit and ground, facts have proved that its effect is very good, can measure faint leakage current less than 0.02mA, precision reaches 0.2 grade, because directly circuit is gone in series connection, electric signal is stronger, reduced accurate requirement to follow-up filter amplification circuit, the output signal of guaranteeing filter amplification circuit is identical with the primary current phase place, improved the computational accuracy of current in resistance property, and current transformer has obtained beyond thought technique effect not because of high pressure is damaged.The inventor analyzes, and reaches as high as though lightning arrester bears voltage
KV, but the leakage current of lightning arrester often has only a milliampere rank, and because discharge time is extremely short and the valve block protection is arranged, the voltage when common current transformer can bear the lightning arrester action on valve block can not burnt.The more important thing is, can stablize, measure reliably, accurately the leakage current of lightning arrester.
As seen, the present invention has not only overcome conventional art prejudice, and has obtained beyond thought technique effect, so the present invention possesses the creativeness of the 22 article of the threeth defined of Patent Law.
Further, this on-line monitoring unit also comprises a CC2591 power amplification chip that is connected with the radio-frequency receiving-transmitting end of CC2430 chip.The combination of CC2430 chip and CC2591 has effectively increased wireless communication distance, has strengthened the signal intensity of wireless network, guarantees signal transmission distance and stability.
Further, in this on-line monitoring unit, the primary coil number of turn of current transformer and secondary coil equal turn numbers, signal conditioning circuit is the step low-pass passive filter circuit.
Further again, this on-line monitoring unit is by solar powered, specifically, described power unit comprises solar panel, controller for solar, the solar cell that connects successively, the voltage output end of described controller for solar is connected with the power supply modulate circuit, described power supply modulate circuit is nursed one's health into 3.3V with the voltage of described solar cell, is described CC2430 chip, CC2591 power amplification chip and their its accessory circuit power supply.
As seen, ingenious conception of the present invention, effect is remarkable, is a kind of innovative means that can effectively measure leakage current of an arrester, has good market outlook.
Description of drawings
Fig. 1 is this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring cellular construction synoptic diagram.
Fig. 2 is this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit scheme of installation.
Fig. 3 is the signal conditioning circuit of this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit.
Fig. 4 is the solar electric power supply system structural drawing of this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit.
Fig. 5 is the power supply modulate circuit of this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit.
Embodiment
Present embodiment Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit as shown in Figure 2, be installed between Zinc-Oxide Arrester 1 and the ground, as shown in Figure 1, its composition comprises: zinc oxide valve plate, rectification circuit, the leakage current indicating gauge, discharge counter, it is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, the CC2430 chip, and power unit, the primary coil of described current transformer is serially connected with between rectification circuit and the ground, secondary coil is in parallel with sampling resistor, the voltage input end of signal conditioning circuit is connected to described sampling resistor two ends, and the signal output part of signal conditioning circuit is connected with the difference sampled signal input end of CC2430 chip.In this example, the on-line monitoring unit also comprises a CC2591 power amplification chip that is connected with the radio-frequency receiving-transmitting end of CC2430 chip.
Leakage current wireless monitor of the present invention unit is improved with counter by traditional leakage current indication and forms, if with 2 short circuits of c, d among Fig. 1, this monitoring device is traditional leakage current indication and counter.
In this Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit, the primary coil number of turn of current transformer and secondary coil equal turn numbers.As shown in Figure 3, signal conditioning circuit is the step low-pass passive filter circuit, and it is a custom circuit, is not described in detail at this.
Shown in Fig. 4,5, the power unit of present embodiment, comprise solar electric power supply system, power supply modulate circuit, described solar electric power supply system is made of the solar panel, controller for solar, the solar cell that connect successively, the voltage output end of controller for solar is connected with as shown in Figure 5 power supply modulate circuit, described power supply modulate circuit adopts the MC78PC33NTR power supply chip, the voltage of solar cell is nursed one's health into 3.3V, be CC2430 chip, CC2591 power amplification chip and their its accessory circuit power supply.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit, composition comprises: zinc oxide valve plate, rectification circuit, the leakage current indicating gauge, discharge counter, it is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, the CC2430 chip, and power unit, the primary coil of described current transformer is serially connected with between rectification circuit and the ground, secondary coil is in parallel with sampling resistor, the voltage input end of signal conditioning circuit is connected to described sampling resistor two ends, and the signal output part of signal conditioning circuit is connected with the difference sampled signal input end of CC2430 chip.
2. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring according to claim 1 unit is characterized in that: also comprise a CC2591 power amplification chip that is connected with the radio-frequency receiving-transmitting end of CC2430 chip.
3. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring according to claim 2 unit is characterized in that: the primary coil number of turn of described current transformer and secondary coil equal turn numbers.
4. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring according to claim 3 unit is characterized in that: described signal conditioning circuit is the step low-pass passive filter circuit.
5. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring according to claim 4 unit, it is characterized in that: described power unit comprises solar panel, controller for solar, the solar cell that connects successively, the voltage output end of described controller for solar is connected with the power supply modulate circuit, described power supply modulate circuit is nursed one's health into 3.3V with the voltage of solar cell, is described CC2430 chip, CC2591 power amplification chip and accessory circuit power supply thereof.
6. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring according to claim 1 unit is characterized in that: described current transformer is an iron core formula current transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110144362 CN102156241B (en) | 2011-05-31 | 2011-05-31 | On-line monitoring unit for leakage current of zinc oxide arrester |
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|---|---|---|---|
| CN 201110144362 CN102156241B (en) | 2011-05-31 | 2011-05-31 | On-line monitoring unit for leakage current of zinc oxide arrester |
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| CN102156241A true CN102156241A (en) | 2011-08-17 |
| CN102156241B CN102156241B (en) | 2013-06-05 |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621457A (en) * | 2012-03-13 | 2012-08-01 | 福建省电力有限公司莆田电业局 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN102721880A (en) * | 2012-05-30 | 2012-10-10 | 吴江市精工铝字制造厂 | Remote lightning rod monitoring system on basis of LED (Light-Emitting Diode) device |
| CN102928646A (en) * | 2012-10-24 | 2013-02-13 | 合肥溢鑫电力科技有限公司 | Voltage sensor taking zinc oxide resistor as voltage divider, and application thereof |
| CN103235214A (en) * | 2013-04-07 | 2013-08-07 | 武汉新电电气技术有限责任公司 | Online monitoring system for zinc oxide lightening arrestor of transmission lines |
| CN103311884A (en) * | 2013-04-23 | 2013-09-18 | 上海良信电器股份有限公司 | Non-stick overvoltage and under-voltage protector with leakage protection function |
| CN103368128A (en) * | 2012-03-31 | 2013-10-23 | 永济新时速电机电器有限责任公司 | Ground fault protection device for locomotive auxiliary power system and electric locomotive |
| CN103364615A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Arrester leakage current monitor isolation sampling circuit |
| CN103558493A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Extra-high voltage zinc oxide arrester leakage current measurement device and method |
| CN104297618A (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | Lightning arrester with leak current measuring function |
| CN104297617A (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | Measuring transducer for leakage current of lightning arrester |
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN106707008A (en) * | 2016-12-27 | 2017-05-24 | 成都信息工程大学 | Electronic current transformer and working method thereof |
| CN109245304A (en) * | 2018-10-12 | 2019-01-18 | 广东佛电电器有限公司 | Low pressure cloud platform platform area's distribution transforming Intelligent electric leakage monitors terminal |
| CN110278633A (en) * | 2019-06-22 | 2019-09-24 | 安徽华新光电饰业有限公司 | LED projector lamp has photochromic consistency control system |
| CN111077400A (en) * | 2020-01-08 | 2020-04-28 | 国网福建省电力有限公司 | 10KV zinc oxide arrester fault monitoring device and control method thereof |
| CN112595994A (en) * | 2020-12-31 | 2021-04-02 | 南京世都科技有限公司 | Lightning arrester leakage current measuring device |
| CN112782458A (en) * | 2020-12-24 | 2021-05-11 | 浙江海普发科技有限公司 | Arrester zinc oxide structure of arrester intellectual detection system module and adaptation |
| CN113608015A (en) * | 2021-08-11 | 2021-11-05 | 南京导纳能科技有限公司 | Counting circuit for lightning stroke action of lightning arrester |
| 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 |
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| CN202126473U (en) * | 2011-05-31 | 2012-01-25 | 江苏省电力公司连云港供电公司 | Online monitoring unit for leakage currents of zinc oxide arrester |
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| CN201278005Y (en) * | 2008-09-17 | 2009-07-22 | 西安理工大学 | Wireless monitoring apparatus for electric power system lightning arrestor |
| 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 |
| CN101701992A (en) * | 2009-11-24 | 2010-05-05 | 广东电网公司深圳供电局 | Electrified tester of digital wireless type zinc oxide arrester |
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Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621457A (en) * | 2012-03-13 | 2012-08-01 | 福建省电力有限公司莆田电业局 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN102621457B (en) * | 2012-03-13 | 2013-12-25 | 国家电网公司 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN103368128B (en) * | 2012-03-31 | 2016-08-10 | 永济新时速电机电器有限责任公司 | Locomotive secondary power system earth-fault protection and electric locomotive |
| CN103368128A (en) * | 2012-03-31 | 2013-10-23 | 永济新时速电机电器有限责任公司 | Ground fault protection device for locomotive auxiliary power system and electric locomotive |
| CN102721880A (en) * | 2012-05-30 | 2012-10-10 | 吴江市精工铝字制造厂 | Remote lightning rod monitoring system on basis of LED (Light-Emitting Diode) device |
| CN102928646A (en) * | 2012-10-24 | 2013-02-13 | 合肥溢鑫电力科技有限公司 | Voltage sensor taking zinc oxide resistor as voltage divider, and application thereof |
| CN103235214A (en) * | 2013-04-07 | 2013-08-07 | 武汉新电电气技术有限责任公司 | Online monitoring system for zinc oxide lightening arrestor of transmission lines |
| CN103311884A (en) * | 2013-04-23 | 2013-09-18 | 上海良信电器股份有限公司 | Non-stick overvoltage and under-voltage protector with leakage protection function |
| CN103311884B (en) * | 2013-04-23 | 2017-12-19 | 上海良信电器股份有限公司 | A kind of Self-recover overvoltage-undervoltage protector with creepage protection function |
| CN103364615A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Arrester leakage current monitor isolation sampling circuit |
| CN103558493A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Extra-high voltage zinc oxide arrester leakage current measurement device and method |
| CN104297617A (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | Measuring transducer for leakage current of lightning arrester |
| CN104297618A (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | Lightning arrester with leak current measuring function |
| CN104297618B (en) * | 2014-10-12 | 2017-06-13 | 胡智宏 | Arrester with leakage current measurement function |
| CN104297617B (en) * | 2014-10-12 | 2017-07-07 | 胡智宏 | Lightning arrester leakance measurement sensor |
| CN105301432A (en) * | 2015-11-26 | 2016-02-03 | 国网山东省电力公司济南供电公司 | Electric power equipment insulation leakage current on-line monitoring circuit |
| CN106707008A (en) * | 2016-12-27 | 2017-05-24 | 成都信息工程大学 | Electronic current transformer and working method thereof |
| CN109245304A (en) * | 2018-10-12 | 2019-01-18 | 广东佛电电器有限公司 | Low pressure cloud platform platform area's distribution transforming Intelligent electric leakage monitors terminal |
| CN110278633A (en) * | 2019-06-22 | 2019-09-24 | 安徽华新光电饰业有限公司 | LED projector lamp has photochromic consistency control system |
| CN110278633B (en) * | 2019-06-22 | 2021-06-18 | 安徽华新光电饰业有限公司 | Light-color consistency control system of LED light projecting lamp |
| CN111077400A (en) * | 2020-01-08 | 2020-04-28 | 国网福建省电力有限公司 | 10KV zinc oxide arrester fault monitoring device and control method thereof |
| CN112782458A (en) * | 2020-12-24 | 2021-05-11 | 浙江海普发科技有限公司 | Arrester zinc oxide structure of arrester intellectual detection system module and adaptation |
| CN112595994A (en) * | 2020-12-31 | 2021-04-02 | 南京世都科技有限公司 | Lightning arrester leakage current measuring device |
| CN113608015A (en) * | 2021-08-11 | 2021-11-05 | 南京导纳能科技有限公司 | Counting circuit for lightning stroke action of lightning arrester |
| CN113608015B (en) * | 2021-08-11 | 2024-04-09 | 南京导纳能科技有限公司 | Counting circuit for lightning stroke action of lightning arrester |
| 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 |
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Effective date of registration: 20121101 Address after: 222004 Lianyungang City, Jiangsu province Sinpo District Road No. 13 Applicant after: Lianyungang Power Supply Company of Jiangsu Electric Power Company Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Applicant after: Nanjing Daonaneng Technology Co.,Ltd. Address before: 222004 Lianyungang City, Jiangsu province Sinpo District Road No. 13 Applicant before: Lianyungang Power Supply Company of Jiangsu Electric Power Company Applicant before: Nanjing Daonaneng Technology Co.,Ltd. |
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