CN203705522U - Insulator leakage current acquisition system - Google Patents

Insulator leakage current acquisition system Download PDF

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Publication number
CN203705522U
CN203705522U CN201420055331.0U CN201420055331U CN203705522U CN 203705522 U CN203705522 U CN 203705522U CN 201420055331 U CN201420055331 U CN 201420055331U CN 203705522 U CN203705522 U CN 203705522U
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CN
China
Prior art keywords
resistance
leakage current
connects
chip microcomputer
operational amplifier
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Expired - Fee Related
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CN201420055331.0U
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Chinese (zh)
Inventor
徐志钮
王怡聪
牛胜锁
苗鹏超
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North China Electric Power University
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North China Electric Power University
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Priority to CN201420055331.0U priority Critical patent/CN203705522U/en
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Expired - Fee Related legal-status Critical Current
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Abstract

Provided is an insulator leakage current acquisition system. The insulator leakage current acquisition system comprises a current transformer, a one-chip microcomputer, a wireless communication chip, a level switching circuit and a signal conditioning circuit. The current transformer is connected with a monitoring circuit of an insulator leakage current. One end of the secondary coil of the current transformer is connected with the ground, and the other end is connected with the PA2 port of the one-chip microcomputer through the level switching circuit and the signal conditioning circuit in order. The serial port of the one-chip microcomputer is connected with an upper computer through the wireless communication chip. The acquisition system arranges a plurality of measurement levels and the plurality of measurement levels can be switched automatically. Compared with a traditional insulator leakage current acquisition system, the acquisition system raises the measurement precision of the insulator leakage current greatly, can provide credible reference information for assessment and prediction of insulator pollution degree, decreases task load of measurement personnel, and lowers labor intensity of measurement personnel.

Description

A kind of insulator leakage current acquisition system
Technical field
The utility model relates to a kind of wide-range, high-precision insulator leakage current measuring system, belongs to field of measuring technique.
Background technology
In electric system, insulator is that the quality of its performance plays a part very crucial to the safe operation of whole transmission system by mechanically interconnective parts of electric conductors different current potential.Especially the insulator of operation out of doors, except should thering is the mechanical property of certain electrical insulation properties and some strength, because of its be exposed in atmosphere and long-term work at suddenly cold and hot, expose to wind and rain, moist, dunghill (acid, ozone, dust etc.) etc. in rugged surroundings, be prone to that insulator underbead crack, surface fracture, dielectric strength reduce and the fault such as pollution flashover.Pollution flashover is that insulator surface leakage current increases excessive, causes the flashover electric discharge phenomena along insulator surface because pollution severity of insulators layer reaches capacity when moistening.Research shows, under wet condition, the leakage current of contaminated insulator is to characterize the good characteristic quantity of pollution level, the leakage current of on-line real time monitoring high-voltage transmission line insulator, can make power system management personnel hold the insulation status of High-Voltage Network operation, to take measures in time to avoid the generation of High-Voltage Network pollution flashover fault in service, improve the safety and reliability of Operation of Electric Systems.
At present conventional insulator leakage current on-line monitoring system have multiple, as the detection system take embedded microcontroller as foreground, the noncontact insulator leakage current detection system based on SB interface, the electric transmission line isolator On-line Monitoring of Leakage Current system based on GSM SMS, monitoring system take ARM microprocessor and C8051F single-chip microcomputer as core etc.Aspect signals collecting, many monitoring systems first utilize accurate noninductive resistance that leakage current signal is converted to voltage signal, then with reaching host computer after single-chip microcomputer collection voltage signal.But existing signal acquiring system generally only has one to measure gear, due to large (between tens microamperes~tens milliamperes) of variation range of leakage current, and the input voltage range of single-chip microcomputer is limited (different according to the difference of chip selection, the input voltage range of for example MEGA16 is 0~5v), so the noninductive resistance of single gear is difficult to meet the precision of current acquisition and the dual restriction of single-chip microcomputer input voltage, thereby is difficult to collect accurate leakage current simultaneously.
Utility model content
The purpose of this utility model is the drawback for prior art, and the insulator leakage current acquisition system that provides a kind of multiple measurement gear to automatically switch, in improving leakage current measurement precision, reduces staff's labour intensity.
Problem described in the utility model realizes with following technical proposals:
A kind of insulator leakage current acquisition system, formation comprises current transformer, single-chip microcomputer, wireless communication chips, gear switch circuit and signal conditioning circuit, in the monitoring circuit of described current transformer access insulator leakage current, one end ground connection of its secondary coil, the other end connects the PA2 port of single-chip microcomputer successively through gear switch circuit and signal conditioning circuit, the serial ports of single-chip microcomputer is connected with host computer by wireless communication chips.
Above-mentioned insulator leakage current acquisition system, described gear switch circuit comprises the first operational amplifier, four relays, four triodes and ten resistance, after being connected in series with the control coil of four relays respectively, four triodes connect supply voltage, their base stage connects respectively four output ports of single-chip microcomputer through the first resistance~four resistance, the inverting input of the first operational amplifier connects the secondary coil of current transformer through the 5th resistance, in-phase input end is through the 6th resistance eutral grounding, output terminal connects the PA2 port of single-chip microcomputer through signal conditioning circuit, the normally closed contact of the first relay, the output terminal of normally opened contact one termination first operational amplifier of the second relay~four relay, the other end connects respectively the inverting input of the first operational amplifier through the 7th resistance~ten resistance.
Above-mentioned insulator leakage current acquisition system, described signal conditioning circuit comprises two operational amplifiers and five resistance, the in-phase input end ground connection of the second operational amplifier, inverting input connects the output terminal of the first operational amplifier and through the 12 connect+2.5V of resistance voltage through the 11 resistance, its output terminal connects its inverting input and connects the inverting input of the 3rd operational amplifier through the 14 resistance through the 13 resistance, the in-phase input end ground connection of the 3rd operational amplifier, output terminal connects the PA2 port of single-chip microcomputer and connects its inverting input through the 15 resistance.
Above-mentioned insulator leakage current acquisition system, also comprises the temperature sensor and the humidity sensor that are installed on tested insulator surface in formation, their signal output part connects respectively the different input ports of single-chip microcomputer.
Above-mentioned insulator leakage current acquisition system, the 7th resistance~ten resistance all adopts noninductive resistance.
Above-mentioned insulator leakage current acquisition system, on the control coil of described four relays all and be connected to fly-wheel diode.
The utility model is provided with multiple measurement gears and multiple measurement gear can automatically switch, compare with traditional insulator leakage current acquisition system, this system has improved the measuring accuracy of insulator leakage current greatly, can provide believable reference information for the Evaluation and Prediction of insulator dirty degree, and reduced the task amount of survey crew, reduce the labour intensity of survey crew.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is electrical schematic diagram of the present utility model.
In figure, each label is: U1, the first operational amplifier, U2, the second operational amplifier, U3, the 3rd operational amplifier, U4, single-chip microcomputer, U5, wireless communication chips, CT, current transformer, Q1, the first triode, Q2, the second triode, Q3, the 3rd triode, Q4, the 4th triode, J1, the first relay, J2, the second relay, J3, the 3rd relay, J4, the 4th relay, J1-1, the normally closed contact of the first relay, J2-1, the normally opened contact of the second relay, J3-1, the normally opened contact of the 3rd relay, J4-1, the normally opened contact of the 4th relay, D1, the first fly-wheel diode, D2, the second fly-wheel diode, D3, the 3rd fly-wheel diode, D4, the 4th fly-wheel diode, T, temperature sensor, S, humidity sensor, R1~R15, the first resistance~15 resistance.
Embodiment
Referring to Fig. 1, the utility model hardware components is provided with the noninductive resistance of different gears, gathers after current signal is converted to voltage signal, and specific embodiments is as follows:
Adopting on the basis of the measuring method of accurate noninductive resistance ground connection, according to the variation range of leakage current and feature, choose the noninductive resistance of different resistances as different gears, after changing faint leakage current signal into rational voltage signal, sending into MEGA16 chip processes, then utilize Radio Transmission Technology, send signal to the laggard Mobile state of host computer and show and follow-up processing.
The utility model can be realized gear and automatically selects and switch, the principle of work of circuit is: first, carry out the premeasuring (allow it flow through the noninductive resistance that resistance is larger and change voltage signal into) of leakage current, and the signal of measurement is sent into MEGA16 chip; Then, MEGA16 chip is that it selects suitable gear (controlling the actuating of relay of gear) according to the threshold value of the size of input signal and each gear of setting in advance; Finally, use the data of the data cover premeasuring of precision measurement.
Software systems mainly realize host computer and (obtain the peak-to-peak value of leakage current with communicate by letter (frequency acquisition, collection are counted or drainage pattern), the storage (being stored as different-format file and image) of image data, the processing of acquisition system, quantity, voltage and the current and phase difference of different gear amplitude pulse in unit interval, obtain pollution layer parameter according to voltage and current signal matching) and demonstration etc.
The coil ratio of Current Transmit is 1:1, the 7th resistance R 7 is the pre-resistance gathering on branch road, the 8th resistance R 8~ten resistance R 10 is three noninductive resistances on branch road gear, J1-1~J4-1 is that (J1-1 is normally closed contact for the contact of the first relay~four relay, J2-1~J4-1 is normally opened contact), can control the break-make (by MEGA16 chip controls) of each branch road by controlling four relays.The first operational amplifier U1 of the present utility model is connected into amplifying circuit, and object is that signal is amplified to 2.5V left and right; The second operational amplifier U2 is connected into adding circuit, and object is by leakage current (sinusoidal signal, have just have a negative) DC voltage of stack (making signal integral translation), thus input voltage range is controlled at-5V~0; The 3rd operational amplifier U3 is connected into negater circuit, by voltage signal oppositely to meet 0~5V input voltage requirement of MEGA16 chip.The value of many gears resistance is respectively: the 7th resistance R 7(gathers resistance in advance) get 10K ohm, the resistance of the 8th resistance R 8~ten resistance R 10 is got respectively 100K , 1M , 10M (being 3 gears of acquisition system), R5 gets 100 ohm.Now the course of work of this current acquisition system is summarized as follows:
Normally closed contact J1-1 at circuit working initial stage first relay is closed, PA2 port can carry out the pre-collection of signal, and send into the processing of MEGA16 chip, then disconnect the normally closed contact J1-1 of the first relay, and according to the peak-to-peak value of input signal and J2 J3 the relay of the closed corresponding gear of threshold value of J4 gear, thereby realize the accurate collection of leakage current signal.

Claims (6)

1. an insulator leakage current acquisition system, it is characterized in that, it comprises current transformer (CT), single-chip microcomputer (U4), wireless communication chips (U5), gear switch circuit and signal conditioning circuit, in the monitoring circuit of described current transformer (CT) access insulator leakage current, one end ground connection of its secondary coil, the other end connects the PA2 port of single-chip microcomputer (U4) successively through gear switch circuit and signal conditioning circuit, the serial ports of single-chip microcomputer (U4) is connected with host computer by wireless communication chips (U5).
2. a kind of insulator leakage current acquisition system according to claim 1, it is characterized in that, described gear switch circuit comprises the first operational amplifier (U1), four relays, four triodes and ten resistance, described four triodes are respectively the first triode (Q1)~4th triodes (Q4), described four relays are respectively the first relay (J1)~4th relays (J4), and described ten resistance are respectively the first resistance (R1)~tenth resistance (R10), described the first triode (Q1)~4th triode (Q4) connects supply voltage after being connected in series with the control coil of described the first relay (J1)~4th relay (J4) respectively, their base stage connects respectively four output ports of single-chip microcomputer (U4) through the first resistance (R1)~4th resistance (R4), the inverting input of the first operational amplifier (U1) connects the secondary coil of current transformer (CT) through the 5th resistance (R5), in-phase input end is through the 6th resistance (R6) ground connection, output terminal connects the PA2 port of single-chip microcomputer (U4) through signal conditioning circuit, the normally closed contact (J1-1) of the first relay, the output terminal of one termination the first operational amplifier (U1) of the normally opened contact (J4-1) of normally opened contact (J2-1)~the 4th relay of the second relay, the other end connects respectively the inverting input of the first operational amplifier (U1) through the 7th resistance (R7)~tenth resistance (R10).
3. a kind of insulator leakage current acquisition system according to claim 2, it is characterized in that, described signal conditioning circuit comprises two operational amplifiers and five resistance, the in-phase input end ground connection of the second operational amplifier (U2), inverting input connects the output terminal of the first operational amplifier (U1) and through the 12 connect+2.5V of resistance (R12) voltage through the 11 resistance (R11), its output terminal connects its inverting input and connects the inverting input of the 3rd operational amplifier (U3) through the 14 resistance (R14) through the 13 resistance (R13), the in-phase input end ground connection of the 3rd operational amplifier (U3), output terminal connects the PA2 port of single-chip microcomputer (U4) and connects its inverting input through the 15 resistance (R15).
4. a kind of insulator leakage current acquisition system according to claim 3, it is characterized in that, in formation, also comprise the temperature sensor (T) and the humidity sensor (S) that are installed on tested insulator surface, their signal output part connects respectively the different input ports of single-chip microcomputer (U4).
5. a kind of insulator leakage current acquisition system according to claim 4, is characterized in that, the 7th resistance (R7)~tenth resistance (R10) all adopts noninductive resistance.
6. a kind of insulator leakage current acquisition system according to claim 5, is characterized in that, on the control coil of described four relays all and be connected to fly-wheel diode.
CN201420055331.0U 2014-01-28 2014-01-28 Insulator leakage current acquisition system Expired - Fee Related CN203705522U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104569566A (en) * 2014-12-29 2015-04-29 国家电网公司 Measurement device of leaked current at high-voltage end of insulator
CN105717430A (en) * 2016-02-29 2016-06-29 长沙群瑞电子科技有限公司 Insulator polluted current wireless monitoring device on high-voltage transmission line side
CN108614184A (en) * 2018-06-06 2018-10-02 浙江巨磁智能技术有限公司 Electric vehicle combined type leakage current sensing device
CN111736011A (en) * 2020-05-19 2020-10-02 南方电网科学研究院有限责任公司 Controllable zero sequence current transformer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104569566A (en) * 2014-12-29 2015-04-29 国家电网公司 Measurement device of leaked current at high-voltage end of insulator
CN104569566B (en) * 2014-12-29 2017-10-24 国家电网公司 Insulator high-pressure side leakage current measurement device
CN105717430A (en) * 2016-02-29 2016-06-29 长沙群瑞电子科技有限公司 Insulator polluted current wireless monitoring device on high-voltage transmission line side
CN108614184A (en) * 2018-06-06 2018-10-02 浙江巨磁智能技术有限公司 Electric vehicle combined type leakage current sensing device
CN111736011A (en) * 2020-05-19 2020-10-02 南方电网科学研究院有限责任公司 Controllable zero sequence current transformer

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EXPY Termination of patent right or utility model
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Granted publication date: 20140709

Termination date: 20150128