CN202126473U - Online monitoring unit for leakage currents of zinc oxide arrester - Google Patents
Online monitoring unit for leakage currents of zinc oxide arrester Download PDFInfo
- Publication number
- CN202126473U CN202126473U CN2011201819036U CN201120181903U CN202126473U CN 202126473 U CN202126473 U CN 202126473U CN 2011201819036 U CN2011201819036 U CN 2011201819036U CN 201120181903 U CN201120181903 U CN 201120181903U CN 202126473 U CN202126473 U CN 202126473U
- Authority
- CN
- China
- Prior art keywords
- circuit
- leakage current
- chip
- current transformer
- zinc
- 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
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 24
- 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 21
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 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
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process 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
Images
Landscapes
- Thermistors And Varistors (AREA)
Abstract
The utility model relates to an online monitoring unit for leakage currents of a zinc oxide arrester. The online monitoring unit comprises a zinc oxide valve plate, a rectifier circuit, a current transformer, a sampling resistor, a signal conditioning circuit and a CC2430 chip, wherein a primary coil of the current transformer is connected between the rectifier circuit and the ground in series; a secondary coil of the current transformer is connected with the sampling resistor in parallel; a voltage input end of the signal conditioning circuit is connected at both ends of the sampling resistor; and a signal output end of the signal conditioning circuit is connected with a difference sampling signal input end of the CC2430 chip. As the traditional prejudice is broken through in the online monitoring unit, the primary coil of the precise current transformer is boldly and directly connected between the rectifier circuit and the ground in series so as to measure weak leakage currents less than 0.02mA, and the measurement accuracy can reach 0.2 level; as the online monitoring unit has stronger electrical signals, the precision requirement for a follow-up filtering and amplifying circuit is reduced, an output signal of the filtering and amplifying circuit is ensured to be identical with the phase position of primary currents, the calculation accuracy of resistive currents is increased; and the current transformer is not damaged by the high pressure, thereby achieving an expected technical effect.
Description
Technical field
The utility model 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 kinds 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, brings very mistake for the calculating of current in resistance property, even loses 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 through 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.
The utility model content
The utility model 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.
It is following that the utility model solves the technical scheme that its technical matters adopted: Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit; Composition comprises: zinc oxide valve plate, rectification circuit, leakage current indicating gauge, discharge counter; It is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, CC2430 chip and power unit; The primary coil of said current transformer is serially connected with between rectification circuit and the ground; Secondary coil is parallelly connected with sampling resistor, and the voltage input end of signal conditioning circuit is connected to said 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.
The utility model Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit is on the basis of existing traditional leakage current indication and counter, to improve to form.The utility model 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 supplies the CC2430 chip to do the difference sampling, 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 through 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 inventor of the utility model dares to breaking through traditional prejudice, and 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 the 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, guaranteed that the output signal of filter amplification circuit is identical with the primary current phase place, improved the computational accuracy of current in resistance property follow-up filter amplification circuit; And current transformer has obtained beyond thought technique effect not because of high pressure is damaged.The inventor analyzes; Though lightning arrester bears voltage and reaches as high as
kV; But the leakage current of lightning arrester often has only a milliampere rank; Because discharge time is extremely short and the valve block protection arranged; 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.
It is thus clear that the utility model has not only overcome conventional art prejudice, and obtained beyond thought technique effect, so the utility model 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 through solar powered; Specifically, said power unit comprises solar panel, controller for solar, the solar cell that connects successively, and the voltage output end of said controller for solar is connected with the power supply modulate circuit; Said power supply modulate circuit is nursed one's health into 3.3V with the voltage of said solar cell, is said CC2430 chip, CC2591 power amplification chip and accessory circuit power supply thereof.
It is thus clear that, the utility model ingenious conception, 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 is 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, leakage current indicating gauge, discharge counter; It is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, CC2430 chip and power unit, the primary coil of said current transformer are serially connected with between rectification circuit and the ground, and secondary coil is parallelly connected with sampling resistor; The voltage input end of signal conditioning circuit is connected to said 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.
The utility model leakage current wireless monitor unit is improved with counter by traditional leakage current indication and forms, if with c, 2 short circuits of 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.
Like Fig. 4, shown in 5; The power unit of present embodiment; Comprise solar electric power supply system, power supply modulate circuit; Said solar electric power supply system is made up of the solar panel, controller for solar, the solar cell that connect successively, and the voltage output end of controller for solar is connected with power supply modulate circuit as shown in Figure 5, and said power supply modulate circuit adopts the MC78PC33NTR power supply chip; The voltage of solar cell is nursed one's health into 3.3V, give CC2430 chip, CC2591 power amplification chip and accessory circuit power supply thereof.
Except that the foregoing description, the utility model 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 the utility model requirement.
Claims (5)
1. Leakage Current of Zinc-oxide Lightning Arresters on-line monitoring unit; Composition comprises: zinc oxide valve plate, rectification circuit, leakage current indicating gauge, discharge counter; It is characterized in that also comprising: current transformer, sampling resistor, signal conditioning circuit, CC2430 chip and power unit; The primary coil of said current transformer is serially connected with between rectification circuit and the ground; Secondary coil is parallelly connected with sampling resistor, and the voltage input end of signal conditioning circuit is connected to said 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 said 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: said 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: said power unit comprises solar panel, controller for solar, the solar cell that connects successively; The voltage output end of said controller for solar is connected with the power supply modulate circuit; Said power supply modulate circuit is nursed one's health into 3.3V with the voltage of solar cell, is said CC2430 chip, CC2591 power amplification chip and accessory circuit power supply thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201819036U CN202126473U (en) | 2011-05-31 | 2011-05-31 | Online monitoring unit for leakage currents of zinc oxide arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201819036U CN202126473U (en) | 2011-05-31 | 2011-05-31 | Online monitoring unit for leakage currents of zinc oxide arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202126473U true CN202126473U (en) | 2012-01-25 |
Family
ID=45489539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201819036U Expired - Fee Related CN202126473U (en) | 2011-05-31 | 2011-05-31 | Online monitoring unit for leakage currents of zinc oxide arrester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202126473U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156241A (en) * | 2011-05-31 | 2011-08-17 | 江苏省电力公司连云港供电公司 | On-line monitoring unit for leakage current of zinc oxide arrester |
| CN102944738A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Detection system and detection method for leakage current of switchgear arrester |
| 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 |
| CN103454486A (en) * | 2013-08-23 | 2013-12-18 | 国家电网公司 | Lightning arrester performance parameter detecting device |
-
2011
- 2011-05-31 CN CN2011201819036U patent/CN202126473U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156241A (en) * | 2011-05-31 | 2011-08-17 | 江苏省电力公司连云港供电公司 | On-line monitoring unit for leakage current of zinc oxide arrester |
| CN102944738A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Detection system and detection method for leakage current of switchgear arrester |
| 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 |
| CN103454486A (en) * | 2013-08-23 | 2013-12-18 | 国家电网公司 | Lightning arrester performance parameter detecting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102156241B (en) | On-line monitoring unit for leakage current of zinc oxide arrester | |
| CN101603994B (en) | On-line monitoring device of metallic oxide arrester | |
| US20170108550A1 (en) | Monitoring device for a surge arrester and monitoring system comprising a monitoring device | |
| CN106058837B (en) | A kind of leakage conductor leak current detection device of no isolating device | |
| CN1873429B (en) | Method and circuit for measuring voltage, insulation resistance, and capacitance in communication line | |
| CN201780328U (en) | On-line monitoring device for wireless transmission lightning arrester | |
| CN202126473U (en) | Online monitoring unit for leakage currents of zinc oxide arrester | |
| CN107132445A (en) | A kind of AC/DC arrester real time on-line monitoring device | |
| CN108169548A (en) | A kind of arrester on-Line Monitor Device | |
| CN104076193B (en) | A kind of overvoltage harvester based on Zinc-oxide piezoresistor | |
| CN104597414A (en) | Signal lamp or street lamp parameter detection electric method | |
| CN106771842A (en) | A kind of fuse on-line monitoring system | |
| CN102023250A (en) | Metal oxide arrester monitoring device | |
| CN203631221U (en) | Lightning arrester with real-time current leak monitoring and discharging counting function | |
| CN206057469U (en) | A kind of detection means for being capable of monitor in real time iron core grounding current | |
| CN105137268A (en) | Sampling circuit for residual current transformer | |
| CN211043488U (en) | Lightning arrester direct current reference voltage test acquisition device based on Zigbee | |
| CN105467197B (en) | Integrated arrester on-Line Monitor Device | |
| CN205049679U (en) | Residual current transformer sampling circuit | |
| CN103956714B (en) | A kind of high sensitivity multi-functional CT open-circuit protecting device | |
| CN106841888A (en) | Surgesuppressor supervising device and the monitoring system including supervising device | |
| CN105675996B (en) | A kind of power battery internal resistance on-line monitoring system and method | |
| CN204989380U (en) | Join in marriage net PT fuse fault monitoring and diagnostic system | |
| CN208636416U (en) | A kind of CVT secondary voltage analytical equipment based on electronic type transmitter | |
| CN208607278U (en) | A kind of current testing device for CVT secondary voltage test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER COMPANY STATE GRID CORPORAT Free format text: FORMER OWNER: NANJING DAONANENG TECHNOLOGY LTD Effective date: 20121122 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121122 Address after: 222004 Lianyungang City, Jiangsu province Sinpo District Road No. 13 Patentee after: Lianyungang Power Supply Company of Jiangsu Electric Power Company Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Patentee after: Nanjing Daonaneng Technology Co.,Ltd. Address before: 222004 Lianyungang City, Jiangsu province Sinpo District Road No. 13 Patentee before: Lianyungang Power Supply Company of Jiangsu Electric Power Company Patentee before: Nanjing Daonaneng Technology Co.,Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20120531 |