CN205229328U - Off -line zinc oxide arrester tester - Google Patents
Off -line zinc oxide arrester tester Download PDFInfo
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- CN205229328U CN205229328U CN201520921556.4U CN201520921556U CN205229328U CN 205229328 U CN205229328 U CN 205229328U CN 201520921556 U CN201520921556 U CN 201520921556U CN 205229328 U CN205229328 U CN 205229328U
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- zinc oxide
- oxide arrester
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- circuit
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Abstract
The utility model discloses an off -line zinc oxide arrester tester, its hardware part is including signal acquisition module, signal processing module, MCU control module, LED display module, printer module, power module and output module, wherein measuring voltage and leakage current are responsible for to the signal acquisition module, signal processing module is responsible for carrying out signal processing to voltage signal and the current signal gathered, MCU control module is responsible for controlling the coordination work of each functional module to carry out analysis to data, voltage, current waveform and numerical value are responsible for showing by the LED display module, the printing of result is responsible for to the printer module, power module is responsible for the power supply work of whole tester circuit, output module can connect other equipment, exports test data, the utility model is used for zinc oxide arrester making regular check on and maintaining, effectively measures resistive current to the performance of judging zinc oxide arrester is fine or not, and the stable performance is reliable.
Description
Technical field
The utility model belongs to Zinc-Oxide Arrester detection technique field, particularly relates to a kind of off-line type zinc oxide arrester tester.
Background technology
Lightning arrester is as one of the visual plant of electric system, and its normal operation is particularly important to the safe power supply of electric system.Along with the progress in epoch, Zinc-Oxide Arrester has the advantage of excellent nonlinear characteristic and good through-current capability with it, instead of the lightning arrester of other type gradually, becomes the overvoltage protective device of electric system.China's electric system started just to promote the use of Zinc-Oxide Arrester in the whole nation from the sixties in 20th century.China has had a large amount of high-pressure oxidation zinc lightning arresters (mainly referring to 110kV and above) and drops into operation of power networks since the eighties.Although most operation conditions is good, for the lightning arrester putting into operation more than 20 year, it is aging whether it starts, and whether nonlinear characteristic changes etc. and receive more and more many concerns.
Eliminate discharging gap due to Zinc-Oxide Arrester and there is leakage current in work, deterioration, filthy, to make moist and the factor such as overvoltage all will the performance of infringement zinc oxide valve plate, directly jeopardize the safe operation of electric system.Therefore, for ensureing that lightning arrester works under good state performance, being ensure the reliability of Operation of Electric Systems and security, in order to find accident potential as early as possible and be got rid of in time, carrying out monitoring and fault diagnosis be very important to zinc paste is lightning-arrest.
Zinc-Oxide Arrester detection method conventional at present mainly contains: total leakage current method, current in resistance property third harmonic method, conventional penalty method, the mensuration based on temperature, harmonic analysis method.
1, total leakage current method
Total leakage current method is substantially constant based on the capacitive component in MOA leakage current, the increase of total leakage current can reflect this principle of growth pattern of its current in resistance property to a certain extent, basic skills is utilizing μ A to show to measure total leakage current that ground lead passes through, observing the change of its size.But because current in resistance property generally only accounts for a part very little in total leakage current, great changes will take place usually to occur current in resistance property, and total leakage current still changes very little situation, therefore, this method is too coarse, and sensitivity is low, just a kind of simple observation procedure, is not suitable for extensive employing.
2, current in resistance property third harmonic method
Current in resistance property third harmonic method (be otherwise known as zero sequence drying method) is that total current is detected third harmonic correlated components by bandpass filter, according to total current in resistance property of MOA and the proportionate relationship of third harmonic resistive component, obtains current in resistance property peak value.Third harmonic current in resistance property is measured by the small current mutual inductor on three-phase ground line.When system voltage is not containing harmonic component, the first-harmonic capacity current in three-phase current and fundamental harmonic resistant leakage current cancel each other, and only remaining third harmonic current in resistance property in ground wire, it equals three-phase third harmonic current in resistance property sum, i.e. I
0=3I
r3.The current in resistance property I total according to MOA
rwith third harmonic current in resistance property I
r3between have certain proportion relations I in size
r=f(I
r3), the large small leak of total current in resistance property can also be drawn.
The characteristic of the valve block of the different size of the valve block produced due to each factory and same manufacturer production is not quite similar, cause the funtcional relationship between third harmonic peak value and current in resistance property peak value different, and the funtcional relationship of both is again change along with the aging of valve block; Harmonic content in MOA terminal voltage (busbar voltage) also has a direct impact measurement result; In addition, the situation of also cannot react MOA surface filth, making moist.Therefore, third harmonic method neither has versatility, can not react the actual operating mode of MOA more objectively, can only be confined to the longitudinal comparison of identical product under same test condition.
The method is easy to implement, but works as I
owhen changing, not easily judge which occurs exception mutually.In addition, if containing harmonic component in system voltage, then capacitance current also will containing third harmonic, with I
r3the I measured will be made after superposition
oincrease a lot than the third-harmonic component of actual current in resistance property, produce illusion.
3, conventional penalty method
Conventional to compensate ratio juris be the reason producing active loss based on causing valve block to generate heat is resistive current component, removes the capacitive current component becoming pi/2 phase difference with busbar voltage, thus obtain current in resistance property with additional capacity current.
This method can measure total leakage current, resistive current component and power attenuation, and principle is simple, and reliability is high, good stability, easy to use.Just can obtain in but the current in resistance property of this method only in total leakage current just in time becomes pi/2 phase difference with capacity current reacting the aging legitimate reading of valve block.When test site has interference, due to the effect of alternate stray capacitance, capacity current and voltage do not become pi/2 phase poor, so just capacity current full remuneration can not be fallen, cause measuring error.Penalty method gets voltage signal from voltage transformer (VT) in addition, may there is phase shift, when line voltage has a harmonic wave, also can affect the precision that it is measured.
4, based on the mensuration of temperature
Temperature monitoring method is a kind of completely new approach, and it better solves current MOA on-line monitoring Problems existing, has effect very much for improving of on-line monitoring system.Measuring tempeature is not a kind of direct method understanding running status, but temperature is the synthesis result affecting MOA running state parameter, under continuous running voltage, MOA's is overheated directly relevant to energy loss, and with the factor such as the quality of working voltage and external interference without direct relation.When MOA normally runs, it is better that it absorbs energy loss ability, and energy absorption is much larger than energy loss, and temperature variation is very little.When there is superpotential, temperature may temporarily can rise to some extent, but can slowly recover.Aging or by the time of tide, energy loss significantly increases, and temperature progressively can rise and be irreversible trend.
Measuring MOA internal temperature is generally be sent to receiver by optics fiber optic temperature information, but this method is also under test at present, also has with a certain distance from Site Detection.How the running temperature of Site Detection MOA inside has become a MOA detection technique important topic.Also there is no particularly preferred detection system at present, but this is a very promising detection technique, merits attention.
5, harmonic analysis method
Under the effect of sine voltage, only have fundamental current to do work in the resistance electric current of MOA and produce power consumption, in addition, regardless of harmonic voltage, resistive fundamental current is all a definite value, and therefore total current is through digital frequency analysis, extracts first-harmonic and carries out current in resistance property decomposition, the first-harmonic of current in resistance property can be obtained, judge the working condition of MOA according to the change of resistive current first harmonics proportion.The process measured is: first obtained the current signal and the MOA working voltage signal that flow through MOA by sensor, utilize waveform acquisition equipment that this time domain waveform is synchronously converted to digitizing discrete signal, then computing machine is utilized by two discrete digital waveform signals through discrete Fourier transformation or Fast Fourier Transform (FFT), obtain each harmonic phase angle of voltage, electric current, and then from total leakage current, isolate resistive current first harmonics value and current in resistance property each harmonic value.
Zinc-Oxide Arrester, as the important proterctive equipment of electric system, designs a kind of practicality, reliably tester and is of great practical significance to the quality detecting its performance.
Utility model content
For the deficiency that prior art exists, the utility model provides a kind of off-line type zinc oxide arrester tester.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of off-line type zinc oxide arrester tester, comprises signal acquisition module, signal processing module, MCU control module, LED display module, printer module, power module and output module; Described signal acquisition module, signal processing module, MCU control module connect successively, and described MCU control module connects LED display module, printer module and output module respectively; Described power module is that MCU control module is powered.
Preferably, described signal acquisition module comprises voltage transformer (VT) summation current transformer; Described signal processing module comprises filtering circuit, the first level-conversion circuit, the first amplifying circuit, second electrical level translation circuit, the second amplifying circuit; Described MCU control module comprises the A/D change-over circuit and processor that connect successively; Described voltage transformer (VT) is connected successively with filtering circuit, the first level-conversion circuit, the first amplifying circuit; Described current transformer is connected successively with second electrical level translation circuit, the second amplifying circuit; The first described amplifying circuit is connected with A/D change-over circuit respectively with the second amplifying circuit;
Preferably, described power module is direct supply, and described direct supply is connected with processor.
Preferably, described LED display module is liquid crystal display, and described liquid crystal display selects TFT6448-5.7 bus-type liquid crystal display, and is connected with processor.
Preferably, described printer module is mini-printer, and described mini-printer is SPRM series thermal printer, and is connected with processor.
Preferably, the processor in described MCU control module adopts model to be the processor of dsPIC30F6015.
Preferably, described output module is I/O output interface, and one end of described I/O output interface is connected with processor, and the other end exports.
Preferably, AD620 amplifying circuit selected by the first described amplifying circuit and the second amplifying circuit.
Preferably, described current transformer selects model to be the current transformer of KT0.02A/PJ-1.6V.
Technique scheme has following beneficial effect:
A kind of off-line type zinc oxide arrester tester, judged Zinc-Oxide Arrester operation conditions by the size measuring resistive current first harmonics value, avoid the interference of mains by harmonics voltage, analysis result is more reliable compared to additive method; The associated voltage calculated, electric current are presented on liquid crystal display with the form of waveform and numerical value, make intuitive measurement results clear, and the staff that is more convenient for judges; This utility model is easy and simple to handle, and portable construction is succinct, is conducive to the insulation status of operations staff's test and judge Zinc-Oxide Arrester quickly and easily, and effective, thus effectively ensure that the safety and reliability of electric power system stable operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is system architecture schematic diagram of the present utility model;
Fig. 3 is the principle schematic that the utility model carries out working offline;
In figure, 1-signal acquisition module, 2-signal processing module, 3-MCU control module, 4-LED display module, 5-printer module, 6-power module, 7-output module, 8-current transformer is popped one's head in, and 9-voltage transformer (VT) is popped one's head in.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the structural representation of a kind of off-line type zinc oxide arrester tester of the utility model, and Fig. 2 is the system architecture schematic diagram of a kind of off-line type zinc oxide arrester tester of the utility model.As shown in the figure: a kind of off-line type zinc oxide arrester tester, signal acquisition module 1, signal processing module 2, MCU control module 3, LED display module 4, printer module 5, power module 6 and output module 7 is comprised; Described signal acquisition module 1, signal processing module 2, MCU control module 3 connect successively, and described MCU control module 3 connects LED display module 4, printer module 5 and output module 7 respectively; Described power module 6 is powered for MCU control module 3.
Wherein said signal acquisition module 1 is responsible for voltage and the leakage current of measuring Zinc-Oxide Arrester to be measured; Described signal processing module 2 is responsible for carrying out signal transacting to the voltage signal gathered and current signal; Described MCU control module 3 is responsible for the co-ordination controlling each functional module, and carries out computational analysis to data-signal; Described LED display module 4 is responsible for voltage, current waveform and the numerical value that display calculates; Described printer module 5 is responsible for the printing of waveform result; Described power module 6 is responsible for the powered operation of whole tester circuit; Described output module 7 can connect other equipment, test data is exported.
Signal acquisition module 1 comprises voltage transformer (VT) summation current transformer; Described voltage transformer (VT) obtains the low-voltage ac signal of same frequency from testing transformer, is the low-voltage of secondary circuit by the high-voltage variable of primary circuit; Described current transformer selects model to be the current transformer of KT0.02A/PJ-1.6V, obtains the leakage current signal that signal fidelity is high.
Described signal processing module 2 is divided into voltage signal process and current signal process two parts, two parts are separate, voltage signal processing section comprises filtering circuit, the first level-conversion circuit, the first amplifying circuit, and current signal processing section comprises second electrical level translation circuit, the second amplifying circuit; Filtering circuit is connected with voltage transformer (VT) by circuit, first level-conversion circuit connects filtering circuit, and then connect the first amplifying circuit, the voltage signal that described signal acquisition module 1 gathers is transferred to signal processing module 2, successively circuit, the first level-conversion circuit and the first amplifying circuit process after filtering, and output voltage range is that the voltage signal of 0-5V is transferred to MCU control module 3 and processes; Current signal processing section comprises second electrical level translation circuit and the second amplifying circuit, second electrical level translation circuit connects current transformer circuit, then be connected with the second amplifying circuit, the current signal transfer that described signal acquisition module 1 gathers is to signal processing module 2, successively process through second electrical level translation circuit and the second amplifying circuit, be then transferred to MCU control module 3 and process.AD620 amplifying circuit selected by the first described amplifying circuit and the second amplifying circuit.
Described MCU control module 3 comprises the A/D change-over circuit and processor that connect successively; Described voltage transformer (VT) is connected successively with filtering circuit, the first level-conversion circuit, the first amplifying circuit; Described current transformer is connected successively with second electrical level translation circuit, the second amplifying circuit; The first described amplifying circuit is connected with A/D change-over circuit respectively with the second amplifying circuit; MCU control system 3 selects dsPIC30F6015 processor, by connection first amplifying circuit and the second amplifying circuit, the A/D converter that A/D change-over circuit uses its inside to carry, the voltage transmitted through signal processing module 2, current signal convert digital signal to through A/D change-over circuit, computational analysis is carried out again through processor circuit, obtain corresponding magnitude of voltage and current value, and draw out voltage, current waveform.
Described LED display module 4 mainly comprises liquid crystal display circuit, selects TFT6448-5.7 bus-type liquid crystal display, with processor by connection, ensures that common processor drives color line screen, also can obtain very smooth display effect.Oscillogram MCU control module 3 transmitted and numerical information clearly present on a display screen.
Described printer module 5 is mini-printer, and described mini-printer is SPRM series thermal printer, is connected with processor; This printer has that volume is little, lightweight, complete function, high speed, high-resolution, appearance looks elegant, the advantage such as simple to operate, easy to connect.
Described power module 6 passes through connection, for signal acquisition module 1, signal processing module 2, MCU control module 3, LED display module 4, printer module 5 and output module 7 provide direct supply with processor.
Described output module 7 is I/O output interface, and one end of described I/O output interface is connected with processor, and the other end exports.
Fig. 3 is the fundamental diagram of a kind of off-line type zinc oxide arrester tester of the utility model, as shown in the figure: left side is testing transformer, first obtain by current transformer probe 8 in signal acquisition module 1 and voltage transformer (VT) probe 9 current signal and the MOA working voltage signal that flow through MOA respectively, utilize signal processing module 2 that this time domain waveform is synchronously converted to digitizing discrete signal, then MCU control module 3 is utilized by two discrete digital waveform signals through discrete Fourier transformation or Fast Fourier Transform (FFT), obtain voltage, the each harmonic phase angle of electric current, and then from total leakage current, isolate resistive current first harmonics value and current in resistance property each harmonic value, liquid crystal indicator is utilized oscillogram and result of calculation to be shown.
Above-described embodiment; to the purpose of this utility model; technical scheme and beneficial effect have carried out further detailed description; be understood that; the foregoing is only embodiment of the present utility model, and be not used in restriction protection domain of the present utility model, all within spirit of the present utility model and principle; any amendment of making, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. an off-line type zinc oxide arrester tester, is characterized in that: comprise signal acquisition module (1), signal processing module (2), MCU control module (3), LED display module (4), printer module (5), power module (6) and output module (7); Described signal acquisition module (1), signal processing module (2), MCU control module (3) connect successively, and described MCU control module (3) connects LED display module (4), printer module (5) and output module (7) respectively; Described power module (6) is MCU control module (3) power supply; Described signal acquisition module (1) comprises voltage transformer (VT) summation current transformer; Described signal processing module (2) comprises filtering circuit, the first level-conversion circuit, the first amplifying circuit, second electrical level translation circuit, the second amplifying circuit; Described MCU control module (3) comprises the A/D change-over circuit and processor that connect successively; Described voltage transformer (VT) is connected successively with filtering circuit, the first level-conversion circuit, the first amplifying circuit; Described current transformer is connected successively with second electrical level translation circuit, the second amplifying circuit; The first described amplifying circuit is connected with A/D change-over circuit respectively with the second amplifying circuit.
2. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: described power module (6) is direct supply, and described direct supply is connected with processor.
3. a kind of off-line type zinc oxide arrester tester according to claim 1, it is characterized in that: described LED display module (4) is liquid crystal display, described liquid crystal display selects TFT6448-5.7 bus-type liquid crystal display, and is connected with processor.
4. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: described printer module (5) is mini-printer, and described mini-printer is SPRM series thermal printer, and is connected with processor.
5. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: the processor in described MCU control module (3) adopts model to be the processor of dsPIC30F6015.
6. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: described output module (7) is I/O output interface, and one end of described I/O output interface is connected with processor, and the other end exports.
7. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: AD620 amplifying circuit selected by the first described amplifying circuit and the second amplifying circuit.
8. a kind of off-line type zinc oxide arrester tester according to claim 1, is characterized in that: described current transformer selects model to be the current transformer of KT0.02A/PJ-1.6V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520921556.4U CN205229328U (en) | 2015-11-18 | 2015-11-18 | Off -line zinc oxide arrester tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520921556.4U CN205229328U (en) | 2015-11-18 | 2015-11-18 | Off -line zinc oxide arrester tester |
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| CN205229328U true CN205229328U (en) | 2016-05-11 |
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| CN201520921556.4U Expired - Fee Related CN205229328U (en) | 2015-11-18 | 2015-11-18 | Off -line zinc oxide arrester tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771719A (en) * | 2016-11-28 | 2017-05-31 | 唐恩(厦门)电气有限公司 | A kind of metal oxide arrester tester |
| CN111505420A (en) * | 2020-04-29 | 2020-08-07 | 国网陕西省电力公司电力科学研究院 | Online monitoring and diagnosing method and system for state of line arrester |
| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
-
2015
- 2015-11-18 CN CN201520921556.4U patent/CN205229328U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771719A (en) * | 2016-11-28 | 2017-05-31 | 唐恩(厦门)电气有限公司 | A kind of metal oxide arrester tester |
| CN111505420A (en) * | 2020-04-29 | 2020-08-07 | 国网陕西省电力公司电力科学研究院 | Online monitoring and diagnosing method and system for state of line arrester |
| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20161118 |