CN203025253U - Capacitive equipment dielectric loss energized testing device - Google Patents
Capacitive equipment dielectric loss energized testing device Download PDFInfo
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- CN203025253U CN203025253U CN 201320030674 CN201320030674U CN203025253U CN 203025253 U CN203025253 U CN 203025253U CN 201320030674 CN201320030674 CN 201320030674 CN 201320030674 U CN201320030674 U CN 201320030674U CN 203025253 U CN203025253 U CN 203025253U
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- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000012545 processing Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000009413 insulation Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000011787 zinc oxide Substances 0.000 abstract description 2
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 230000003449 preventive effect Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229960001296 zinc oxide Drugs 0.000 description 1
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Abstract
本实用新型公开了一种容性设备介质损耗带电测试装置，它包括电流传感器（1），其特征在于：电流传感器（1）通过测试电缆与信号调理单元（2）连接，信号调理单元（2）与处理器（3）连接，在处理器（3）上连接有显示输出单元（4）。本实用新型通过专业测量电路和系统软件能够完成变电站内容性设备（包括电容式电压互感器、电流互感器、高压套管、氧化锌避雷器、耦合电容器等）介质损耗，电容量等参数的测量，能够在不停电下的情况下对容性设备的交流绝缘情况进行定量分析，实现了变电站设备绝缘状况的状态检修。
The utility model discloses a live test device for dielectric loss of capacitive equipment, which includes a current sensor (1), and is characterized in that: the current sensor (1) is connected with a signal conditioning unit (2) through a test cable, and the signal conditioning unit (2) ) is connected to the processor (3), and a display output unit (4) is connected to the processor (3). The utility model can complete the measurement of dielectric loss, capacitance and other parameters of substation content equipment (including capacitive voltage transformer, current transformer, high-voltage bushing, zinc oxide arrester, coupling capacitor, etc.) through professional measurement circuit and system software. It can quantitatively analyze the AC insulation condition of the capacitive equipment without power failure, and realize the condition-based maintenance of the insulation condition of the substation equipment.
Description
Technical field
The utility model relates to a kind of capacitive apparatus medium loss live testing device, belongs to power industry pick-up unit technical field.
Background technology
Power equipment inside if there is bad because making, make moist, insulation defect that the factor such as aging and mechanical and heat damage causes, the insulation fault of the normal operation of high-tension apparatus and electrical network that will make a difference.Power industry development present stage, maintenance means commonly used were preventive trial.Preventive trial is after putting equipment in service, regularly has a power failure equipment is tested and overhauled.Although the preventive trial development is ripe for many years, the limitation that also has some to overcome: (1) needs to have a power failure and measures, and loses certain economic benefit.Need all or part of disassembling section when (2) testing, waste time and energy.(3) test condition of preventive trial (such as voltage) differs larger with running status; (4) twice preventive trial are longer interval time.
So along with the development of science and technology, the POWER SYSTEM STATE maintenance is certain to progressively replace preventive trial.The related portable test arrangement of this patent has overcome above-described limitation, combines well preventive trial and repair based on condition of component, namely can be used for verifying mutually with on-line monitoring system, also can be used for uninterrupted power test.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of detection and does not have a power failure, and accuracy of detection is high, fireballing capacitive apparatus medium loss live testing device, can overcome the deficiencies in the prior art.
The technical solution of the utility model is: a kind of capacitive apparatus medium loss live testing device, it comprises current sensor, current sensor is connected with the signal condition unit by test cable, and the signal condition unit is connected with processor, is connected with the demonstration output unit on processor.
The signal condition unit comprises filter amplifier and analog to digital converter.
Current sensor selects initial permeability high, and the little permalloy of loss is done iron core.
The signal condition unit also comprises phase inverter and totalizer.
Compared with the prior art, the utility model finds and a kind ofly can exchange the device that insulation parameter is tested to the electric system capacitance type equipment at any time in the situation that do not have a power failure.It is mainly to realize like this: at first be input to the signal condition unit of device inside with reference to the end shield current signal of equipment and equipment under test by two current sensors, amplify through signal amplitude, filtering, after phase place was amplified, (A/D) converted the digital signal that computing machine can directly be processed to via high-speed AD converter.Then pass through a series of control of software and computing, draw result of calculation, show output by liquid crystal display at last.The gordian technique and the algorithm that wherein adopt have: (1) digital signal processing (DSP) technology, sampling rate is 10kHz/s(2) and use fourier series, extract first-harmonic content in signal, the low-pass digital filter algorithm is eliminated impulse disturbances.(3) use trigonometric function and vector operation calculation medium loss angle.(4) oppositely the superposition phase amplifying technique is guaranteed the accuracy and the pincerlike current sensor of the open type of stability (5) shielding processing that small angular difference is measured.
The professional metering circuit that native system comprises and system software can be completed capacitive apparatus in transformer station (comprising capacitance type potential transformer, current transformer, bushing, Zinc-Oxide Arrester, coupling condenser etc.) dielectric loss, the isoparametric measurement of electric capacity, can in the situation that under not having a power failure the interchange insulation situation to capacitive apparatus carry out quantitative test, realized the repair based on condition of component of substation equipment insulation status.Native system mainly is made of following functional module: signal transducer module, high-speed sampling module, digital signal processing and algoritic module, the formations such as data Storage ﹠ Display module.This test macro has following technical characterstic:
1. test macro adopts embedded microprocessor (cpu), extend out 16, at a high speed, Multi-path synchronous Middle Sampling Analog Digital converter (A/D), realize real-time measurement and high precision computation to monitoring variable.
2. provide the two media loss online detection mode, both can measure dielectric loss difference and the electric capacity ratio of two homophase capacitance type equipments, available PT secondary side voltage is made reference signal again, and electric capacity and the dielectric loss value of equipment are measured.
3. employing high speed digital sample, the lower quantization error.
4. adopt Fourier series to separate harmonic component, utilize digital filtering technique, solve preferably dielectric loss measuring accuracy and stability problem thereof, can guarantee that the dielectric loss test result is not subjected to the impact of humorous wave interference and impulse disturbances, had the absolute sense precision up to ± 0.05%.
5. increased the measuring ability of homophase capacitance type equipment dielectric loss difference and electric capacity ratio, not only can avoid also helping to weaken because using PT secondary side voltage as the dielectric loss test result distortion that reference signal causes the influence degree that alternate electric field disturbs.
6. system can detect the data such as voltage, electric current, dielectric loss, current in resistance property, capacity current of capacitive apparatus, and shows output by liquid crystal display.
7. adopt backoff algorithm to eliminate the coupling of lightning arrester capacitive coupling to the impact of current in resistance property.Lightning arrester arranged in " one " font that Electric Field Distribution is comparatively regular, can correctly record the current in resistance property of two limit phases and the peak value of fundametal compoment thereof.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is software flow pattern
Fig. 3 is the signal sampling schematic diagram;
Fig. 4 is rc filter circuit/low-pass filtering physical model figure;
Fig. 5 is the phase place enlarged diagram.
Embodiment
Embodiment, as shown in Figure 1,Capacitive apparatus medium loss live testing device, to be connected with signal condition unit 2 by test cable by current sensor 1, signal condition unit 2 is connected with processor 3, is connected with to show that output unit 4 consists of, and is furnished with charging system, memory module simultaneously thereon on processor 3; Signal condition unit 2 comprises filter amplifier 5, analog to digital converter 6, phase inverter 7, totalizer 8 and amplifier 9.
Concretely
1, current sensor
Current sensor is the device that need to be stuck in upper first sensory current signal of capacitive apparatus end shield ground connection, the accuracy of sensor directly determines the accuracy of dielectric loss data, requires the sensor of measurement dielectric loss must possess following condition according to project itself and field experiment:
(1) phase angle difference between primary and secondary enough little＜0.01 the degree;
(2) active zero magnetic flux;
(3) due to high-tension apparatus such as sleeve pipe, mutual inductor, coupling condenser, the leakage current of the high-tension apparatuses such as lightning arrester is very little all in the mA level, and the sensor measurement scope should satisfy 100 μ A-700mA;
(4) overcome the strong electromagnetic of on-the-spot test;
(5) aperture is not less than 30mm.
Based on above requirement, current sensor 1 selects initial permeability high, and the little permalloy of loss is done iron core, has adopted unique deep negative feedback technique and unique shielding measure, can automatically compensate iron core, makes iron core be operated in desirable zero magnetic flux state.Mutual inductor will have electric current output, even external short circuit because coil has internal resistance, certainly will have voltage drop.The electromotive force that this voltage drop needs the magnetic flux of alternation to produce provides.Utilize another auxiliary mutual inductor that is superimposed upon on main mutual inductor that back electromotive force is provided, go to compensate the pressure drop that I*R produces, so just do not need the magnetic flux of main mutual inductor that electromotive force is provided, realize zero magnetic flux purpose.Theoretical zero-flux current transformer does not have error, but due to zero magnetic flux of accomplishing that can not real, reach the reasons such as distributed capacitance leakage inductance, and zero-flux current transformer also has error, but has improved at least one order of magnitude than the precision of general mutual inductor.
2 DSP technology (digital signal processing)
For volume and the weight that reduces instrument, improve the reliability of equipment, this project adopts the method for pure digi-tal to carry out signal and processes, and greatly reduces the quantity of components and parts, reduces the electronic devices and components self of knowing clearly and damages the probability of equipment failure that causes.
The sample mode of this project application is the high-speed data sampling, and sampling rate is 10kHz/s, i.e. 200 points of each signal period sampling.The sampled data waveform, as shown in Figure 3, wherein long dotted line is one tunnel electric current I n waveform wherein, a section dotted line is another road electric current I x waveform.
Calculate wherein total current In and Ix according to the data sequence of being adopted.
I
X=
(formula 2-1)
Although formula 2-1 has very simple mathematic(al) structure, and is also inapplicable on computers, must carry out discretize, the integration of formula (2-1) in [0, T] is interval is divided into the N section processes respectively, draw the computing formula of total current effective value:
I
X=
=
=
=
(formula 2-2)
The effective value computing formula of two-way current signal is identical, can calculate the size of relative electric capacity.
3 fourier series
Waveform shown in upper figure is standard sine wave shape under perfect condition, and in fact the waveform of actual measurement all contains harmonic component in various degree, and any one periodic function is all by periodic first-harmonic, 2,3,4 ... the k subharmonic is formed by stacking as shown in formula 3-1:
A in formula
0Be DC component, need in this project to filter.In formula 3-1:
A
mk=
（k=1，2，3……）
A wherein
mkBe first-harmonic or k subharmonic amplitude, a
kBe first-harmonic or k subharmonic phasor real component, b
kBe first-harmonic or k subharmonic phasor imaginary part component, have respectively:
a
k=
(k=1,2,3 ...) (formula 3-2)
b
k=
(k=1,2,3 ...) (formula 3-3)
4 utilize the loss of trigonometric function calculation medium
Use the real part a that fourier series can obtain a vector
1With imaginary part b
1, the real part c that another is vectorial
1With imaginary part d
1According to trigonometric function as can be known:
Tg δ=tg(θ
1-θ
2)=
(formula 4-1)
5 lowpass digital filters
Rc filter circuit as shown in Figure 4
Can get the differential equation according to circuit diagram:
V
i=
V
O+
(formula 5-1)
Obtain difference equation after above differential equation discretize
Can obtain discretize digital signal sequences Vi(n after high-speed a/d converter), calculate the RC value according to the numerical relation of cutoff frequency fH and RC and bring above difference equation into, finally obtain through the burst Vo of low-pass filtering (n).
6 phase place amplifying techniques
The dielectric loss of general electric system capacitive apparatus is very little, that is to say that two phase differential (phase angle) between signal are very little, directly calculates if do not amplify, and can cause Data duplication bad, and accuracy of measurement descends.Amplify the accuracy that can improve system so carried out phase place before carrying out the AD conversion.
Two current signals that native system collects are In and Ix, and because the dielectric loss value is generally little, according to the physical significance formula of dielectric loss, wherein capacity current (vectorial imaginary part) is very large, and current in resistance property (vectorial real part) is relatively very little, can't carry out directly amplifying processing.As shown in figure five.Given this: at first the In signals reverse is processed, amplitude according to the Ix signal, with reverse In signal attenuation or be amplified to the Ix amplitude similar, again two similar signals of amplitude are carried out addition process, because both the amplitude size is similar, phase angle difference both approximate opposite (being 180-δ) is so superposed signal real part and imaginary part are all very little, as shown in figure five Ix '.At this time just can use operational amplifier to carry out high multiple amplifies.
Claims (5)
1. capacitive apparatus medium loss live testing device, it comprises current sensor (1), it is characterized in that: current sensor (1) is connected with signal condition unit (2) by test cable, signal condition unit (2) is connected with processor (3), is connected with to show output unit (4) on processor (3).
2. capacitive apparatus medium loss live testing device according to claim 1, it is characterized in that: signal condition unit (2) comprises filter amplifier (5) and analog to digital converter (6).
3. capacitive apparatus medium loss live testing device according to claim 1, it is characterized in that: current sensor (1) selects initial permeability high, and the little permalloy of loss is done iron core.
4. capacitive apparatus medium loss live testing device according to claim 2, it is characterized in that: signal condition unit (2) also comprises phase inverter (7), totalizer (8) and amplifier (9).
5. capacitive apparatus medium loss live testing device according to claim 1 is characterized in that: current sensor (1) is the pincerlike current sensor of the open type of shielding processing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320030674 CN203025253U (en) | 2013-01-21 | 2013-01-21 | Capacitive equipment dielectric loss energized testing device |
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| CN 201320030674 CN203025253U (en) | 2013-01-21 | 2013-01-21 | Capacitive equipment dielectric loss energized testing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954889A (en) * | 2014-04-03 | 2014-07-30 | 贵州电力试验研究院 | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors |
| CN105785300A (en) * | 2016-03-04 | 2016-07-20 | 福建和盛高科技产业有限公司 | Distributed capacitive equipment online monitoring and calibration device and field calibration method based on device |
| CN109188104A (en) * | 2018-10-12 | 2019-01-11 | 国网陕西省电力公司电力科学研究院 | The dielectric response of paper oil insulation casing not blackouts monitoring system and method |
| CN109959888A (en) * | 2017-12-22 | 2019-07-02 | 苏州市计量测试院 | A kind of zinc oxide arrester tester self-checking device and method |
-
2013
- 2013-01-21 CN CN 201320030674 patent/CN203025253U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954889A (en) * | 2014-04-03 | 2014-07-30 | 贵州电力试验研究院 | Capacitive type device insulation parameter electrification testing method based on pincerlike current sensors |
| CN105785300A (en) * | 2016-03-04 | 2016-07-20 | 福建和盛高科技产业有限公司 | Distributed capacitive equipment online monitoring and calibration device and field calibration method based on device |
| CN105785300B (en) * | 2016-03-04 | 2019-03-15 | 福建和盛高科技产业有限公司 | Distributed capacitive apparatus on-line monitoring calibration equipment and the on-site calibrating method based on the device |
| CN109959888A (en) * | 2017-12-22 | 2019-07-02 | 苏州市计量测试院 | A kind of zinc oxide arrester tester self-checking device and method |
| CN109188104A (en) * | 2018-10-12 | 2019-01-11 | 国网陕西省电力公司电力科学研究院 | The dielectric response of paper oil insulation casing not blackouts monitoring system and method |
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Granted publication date: 20130626 Termination date: 20160121 |
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