CN106526356A - Metal oxide lightning arrester live-line detection validity test system - Google Patents
Metal oxide lightning arrester live-line detection validity test system Download PDFInfo
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- CN106526356A CN106526356A CN201610899097.3A CN201610899097A CN106526356A CN 106526356 A CN106526356 A CN 106526356A CN 201610899097 A CN201610899097 A CN 201610899097A CN 106526356 A CN106526356 A CN 106526356A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a metal oxide lightning arrester live-line detection validity test system, including a direct current test loop and an alternating current test assembly. The direct current test loop comprises an alternating current part and a rectification part and achieves measurement of leakage current in direct current voltage of a metal oxide lightning arrester test object. The alternating current test assembly comprises an alternating current test loop and a high-low temperature test chamber. The metal oxide lightning arrester test object is arranged in the high-low temperature test chamber, so that the test of influences of external factors on characteristic parameters of the metal oxide lightning arrester test object is achieved. Compared with the prior art, the present invention examines the influence of external factors such as temperature, electric load rate and external insulation surface filth on the characteristic parameters of the metal oxide lightning arrester test object. The test result can be applied to the live-line detection of the metal oxide lightning arrester, and the accuracy and the effectiveness of live-line detection test are improved.
Description
Technical field
The invention belongs to electrical engineering field, tries more particularly, to a kind of metal oxide arrester live detection effectiveness
Check system.
Background technology
Zinc-Oxide Arrester (abbreviation MOA) is the important protection defence line of power system device, and the quality of its running status is directly
Connect the effect for affecting its protection other equipment.Live detection is the important means for checking Zinc oxide lightning arrester operation state.So
And, nowadays the state-detection of MOA can not ensure effectiveness and correctness.Multiple supertension power stations represent, spark gap characteristic parameter
Change can not visual representation be out of order and accident generation, testing staff also cannot make according to existing failure criterion sometimes
Go out effectively judgement, in some instances it may even be possible to which making the material resources power failure detection of erroneous judgement labor intensive affects normal operation.Therefore need further
Research, proposes accurately and effectively detection method and failure criterion.
Under continuous running voltage, follow current I of zinc oxide resistance sheet is flow throughxBy current in resistance property IRWith capacity current IC
Composition, as equivalent resistance R is nonlinear resistance, so current in resistance property IRA nonsinusoidal waveform, containing fundamental wave, three times,
Five times and higher order harmonics component, mainly based on fundamental wave and triple harmonic current.Equivalent capacity C is linear capacitance, due to
It is little with its capacitance variation during change in voltage Deng small capacitances C.Therefore, when voltage change range is little, equivalent capacity is approximately
One constant value.Flow through the capacity current I of electric capacity CCWith busbar voltage UxWaveform is consistent.In above-mentioned current component, current in resistance property meeting
Active loss is caused, causes the heating of valve block aging, but as current in resistance property only accounts for the 10%～20% of total leakage current, so
Under working condition, Zinc-Oxide Arrester resistor disc heating power consumption is very low.But with the decline of zinc oxide resistance sheet insulating properties,
The change performance of above-mentioned current component is different.When lightning arrester insulation hydraulic performance decline, aggregate performance is current in resistance property increase, is held
Property electric current be not changed in substantially, due to current in resistance property ratio it is too small, so follow current change is little.
Zinc oxide resistance sheet makes moist and the aging main cause for being to cause the reduction of zinc oxide lightning arrester insulation performance, related text
Offer and show, make moist different with the aging rising degree for causing different components in current in resistance property, therefore to resistor disc leakage current
In analysis, resistive fundamental current and resistive tertiary current is chosen herein as characteristic parameter, while it is right therewith to measure follow current
Than.
In addition, in order to more preferably observe insulating properties situation of change, zinc oxide resistance sheet direct current 1mA is also measured with reference to electricity
Pressure and 0.75U1mAUnder leakage current.
In metal oxide arrester live detection, it is the impact for not considering external factor to spark gap characteristic parameter.So
And, with the improvement of MOA manufacturing technologies, the adjustment of resistor disc Recipe, the state parameter characteristic of MOA has significant change,
The condition detection method of traditional MOA can not ensure the effectiveness of detection and correctness.Operating multiple supertension power station inspections
Survey result represent, the change of spark gap characteristic parameter intuitively can not reflect be out of order and accident generation, testing staff is sometimes
Also effective, accurate judgement cannot be provided according to existing detection data to MOA states, in some instances it may even be possible to make erroneous judgement labor intensive
Material resources have a power failure, and detection impact is normal to be run.In AC extra high voltage MOA scene commissioning tests, under varying environment, same MOA is surveyed
The leakage current for measuring is widely different, in addition, in extra-high voltage MOA live detection, some leakage currents and current in resistance property surpass
Cross the MOA of operating standard, it is subsequent return factory's comprehensive test in do not find any problem.This is to extra-high voltage MOA live detection
Effectiveness and the adaptability of failure criterion propose query.
The content of the invention
The purpose of the present invention is exactly to provide a kind of metal-oxide and keep away to overcome the defect of above-mentioned prior art presence
Thunder device live detection efficiency assay system, improves the accuracy and effectiveness of the test of Zinc-Oxide Arrester live detection.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of metal oxide arrester live detection efficiency assay system, including DC experiment loop and ac test
Component, the DC experiment loop include AC portion and rectifying part, realize metal oxide arrester test product DC voltage
The measurement of lower leakage current, the ac test component include AC Test Circuits and high-low temperature test chamber, the metal oxidation
Thing spark gap test product is arranged in high-low temperature test chamber, realizes extraneous factor to metal oxide arrester test product characteristic parameter
The test of impact.
The AC portion in the DC experiment loop is identical with the structure of AC Test Circuits, including alternating current power supply group
Part, protective resistance, sample resistance, capacitive divider and oscillograph, the alternating current power supply component, protective resistance, capacitive divider
Form loop, the oscillograph in parallel with capacitive divider after the metal oxide arrester test product and sample resistance series connection
Connect the secondary terminals of sample resistance two ends and capacitive divider respectively.
The rectifying part in the DC experiment loop includes rectification silicon stack and commutation capacitor, the anode of the rectification silicon stack with
Protective resistance connects, and negative electrode connects metal oxide arrester test product and commutation capacitor one end respectively, and the commutation capacitor is another
End is connected with alternating current power supply component.
The alternating current power supply component includes power supply, pressure regulator and the transformator being sequentially connected, and the transformator becomes for isolation
Depressor.
The measurement for realizing leakage current under metal oxide arrester test product DC voltage is specially：
A1 alternating current power supply component is adjusted), by oscillograph so that metal oxide arrester test product electric current is 1mA, record
Secondary terminal voltage u of capacitive divider2, obtain the direct current 1mA reference voltages of metal oxide arrester test product；
A2) continue to adjust alternating current power supply component, the secondary terminal voltage for making capacitive divider is 0.75u2, record sample resistance
Both end voltage, obtains the leakage current under 75% DC reference voltage of metal oxide arrester test product.
The test of the impact to metal oxide arrester test product characteristic parameter of realizing extraneous factor is specially：
B1 alternating current power supply component is adjusted), the longtime running voltage of metal-loaded Oxide Arrester test product, by high/low temperature
Proof box changes metal oxide arrester test product temperature, measures the leakage current of metal oxide arrester test product, research temperature
Impact of the degree to metal oxide arrester test product characteristic parameter；
B2 alternating current power supply component is adjusted), the temperature-resistant of metal oxide arrester test product is kept, changes metal-loaded oxygen
Compound spark gap test product working voltage, measures the leakage current of metal oxide arrester test product, and research chargeability is to metal oxygen
The impact of compound spark gap test product characteristic parameter；
B3) the continuous running voltage of metal-loaded Oxide Arrester test product, changes metal oxide arrester test product table
Face pollution degree, measures the leakage current of metal oxide arrester test product, studies metal oxide arrester test product external insulation table
Impact of the face pollution level to metal oxide arrester test product characteristic parameter.
The transformator maximum output voltage is 20kV.
Compared with prior art, the invention has the advantages that：
1) running status and live detection test demand of the present invention according to MOA, for the characteristic in MOA small currents area, if
Test battery system is counted, extraneous factor has been studied, for example temperature, chargeability, external insulation surface filth etc., have kept away to metal-oxide
The impact of the characteristic parameter of thunder device, result of the test are can be applicable in the live detection of metal oxide arrester, improve band electric-examination
Accuracy and effectiveness that test is tested.
2) test loop simple structure of the present invention, test operation are convenient.
3) pilot system of the present invention prevents test loop lifting ground connection using isolating transformer and test loop isolated from power
Voltage produces harm, effective protection oscillograph to oscillograph.
Description of the drawings
Fig. 1 is the structural representation in DC experiment loop of the present invention；
Fig. 2 is the structural representation of AC Test Circuits of the present invention；
Fig. 3 is processing procedure schematic diagram of the present invention to test data.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to
Following embodiments.
The present embodiment provides a kind of metal oxide arrester live detection efficiency assay system, returns including DC experiment
Road and ac test component, the DC experiment loop include AC portion and rectifying part, realize metal oxide arrester
The measurement of leakage current under test product DC voltage, the ac test component include AC Test Circuits and high-low temperature test chamber,
The metal oxide arrester test product is arranged in high-low temperature test chamber, realizes that extraneous factor is tried to metal oxide arrester
The test of the impact of product characteristic parameter.The characteristics of this pilot system is：
1st, power dissipation characteristics in leakage current region of this pilot system mainly for metal oxide arrester resistor disc；
2nd, this pilot system cover it is all on metal oxide arrester characteristic parameter produce affect inside and out
Factor.
As characteristic parameter of the metal oxide arrester resistor disc (MOV) with spark gap overall (MOA) has simply
Cumulative relation, therefore this pilot system is for the development of metal oxide arrester resistor disc.
First, DC experiment loop
As shown in figure 1, DC experiment loop includes AC portion and rectifying part, AC portion includes power supply U, pressure regulator
TV, transformator TM, protective resistance R1, sample resistance R2, electric capacity C1, C2 and oscillograph, power supply U, pressure regulator TV, transformator TM according to
Secondary connection, electric capacity C1, C2 composition capacitive divider, transformator TM, protective resistance R1, capacitive divider form loop, metal oxygen
, sample resistance R2 two ends and capacitance partial pressure in parallel with capacitive divider after compound spark gap test product MOA and sample resistance R2 series connection
The secondary terminals of device connect an oscillograph respectively.Rectifying part includes rectification silicon stack D and commutation capacitor C, the anode of rectification silicon stack D
It is connected with protective resistance R1, negative electrode connects MOA and commutation capacitor C one end respectively, the commutation capacitor C other ends are connected with transformator TM
Connect.
Wherein, protective resistance R1 can prevent loop current excessive, and its parameter is 3.5M Ω；Sample resistance R2 is accurate sampling
Resistance, its resistance are almost unchanged with temperature and voltage, and its parameter is 2k Ω；V1, V2 are voltmeter, by oscilloscope measurement.
The direct current U of MOV test products1mAWithin 10kV, therefore pilot system from transformator maximum output voltage is
20kV, maximum output current are 400mA, and capacity is 5kVA.Pressure regulator model TDDC-3kVA, input voltage are 220V, output
Voltage range is 0V～250V.Rectification is carried out using silicon stack, and water resistance is set in loop used as protective resistance.Measuring instrument
Device is the DPO4032 type oscillographs of Tektronix companies production.
According to the experimental condition of test chamber, as halfwave rectifier can produce larger pulsation, in order to ensure DC voltage
Quality, it is necessary to meet condition of the DC pulse less than ± 3%.Test product nominal DC average voltage is Ud, nominal DC is average
Electric current is Id, the computing formula of DC voltage ripple coefficient S is as follows：
The selection of capacitance parameter is determined by formula (2)：
In formula, f be test voltage frequency, C be rectified current capacitance, UdFor test product nominal DC average voltage, IdFor specified straight
Stream average current, S are DC voltage ripple coefficient.
According to the parameter of dispatching from the factory of test product, it is known that U1mAAbout between 4kV～9kV, average current IdLess than 20mA, will be each
Parameter is brought formula into and can calculate Cmin=833.3nF, so the capacitance in loop should exceed 834nF.According to test chamber bar
Part, can select capacitance is 1 μ F, and withstanding voltage is the capacitor of 20kV.
In order to protect oscillograph, we prevent test loop lifting using isolating transformer and test loop isolated from power
Ground voltage produces harm to oscillograph.
R2 is accurate sample resistance, and its resistance is 2k Ω, measures its voltage, metal oxide arrester test product is obtained
Electric current i,
In formula, uRFor the voltage of R2, unit is V, electric currents of the i for metal oxide arrester test product, unit mA.
Oscillograph 2 shows that voltage is high-voltage capacitive divider secondary voltage u2, primary voltage
u1=n × u2
In formula, u1For spark gap test product high pressure terminal voltage, u2For potentiometer secondary voltage, C1For potentiometer high-voltage capacitance, C2
For potentiometer low-voltage capacitance, n is capacitance partial pressure ratio.
The voltage of metal oxide arrester test product loading can be calculated by following formula,
But as Oxide Arrester substitutional resistance is far longer than sample resistance R2, therefore approximately take in test uMOA=
u1。
Test method：
1) pressure regulator is adjusted, slowly raises test voltage so that voltage is lightning-arrest for 2V, i.e. metal-oxide in oscillograph 1
Device test product electric current is 1mA, voltage u in recording oscillometer 22, it is converted into primary voltage u1, as the direct current 1mA of test product is with reference to electricity
Pressure.
2) continue to adjust pressure regulator, slowly reduce test voltage, make the voltage in oscillograph 2 be 0.75u2, record oscillography
Voltage in device 1, calculates test product electric current, the leakage electricity as under 75% DC reference voltage of metal oxide arrester test product
Stream.
2nd, ac test component
Ac test component includes AC Test Circuits and high-low temperature test chamber, wherein, AC Test Circuits such as Fig. 2 institutes
Show, including power supply U, pressure regulator TV, transformator TM, protective resistance R1, sample resistance R2, electric capacity C1, C2 and oscillograph, power supply U,
Pressure regulator TV, transformator TM are sequentially connected, electric capacity C1, C2 composition capacitive divider, transformator TM, protective resistance R1, electric capacity point
Depressor forms loop, in parallel with capacitive divider after metal oxide arrester test product MOA and sample resistance R2 series connection, sampling electricity
The secondary terminals of resistance R2 two ends and capacitive divider connect an oscillograph respectively.
This pilot system is mainly studied the change of the characteristic parameter under MOA operating conditions, i.e. spark gap and is operated in power frequency
Small current area, it is generally the case that, in 0mA～5mA, the capacity of pressure regulator, transformator used by pilot system will for its leakage current
Ask identical with DC loop.
The extraneous factor of experimental study includes lightning arrester body temperature, therefore selects GDH-2025A type high-low temperature test chambers
Change test product temperature, technical parameter is as shown in table 1.In order to ensure the accuracy of temperature, the whole measurement process of test test product is always
It is stored in proof box, and the temperature inside the box is measured with thermocouple, makes test whole process keep same temperature.
The technical parameter of 1 GDH-2025A type high-low temperature test chambers of table
Test method：
1) pressure regulator is adjusted, loads the longtime running voltage of MOA, change MOA temperature, measure the leakage current of MOA, research
Impact of the temperature to MOA characteristic parameters；
2) pressure regulator is adjusted, holding MOA's is temperature-resistant, changes loading MOA working voltages, measures the leakage current of MOA,
Research impact of the chargeability to MOA characteristic parameters；
3) continuous running voltage of MOA is loaded, changes MOA contamination degree of surface of electric, measure the leakage current of MOA, outside research MOA
Impact of the insulating surface pollution level to MOA characteristic parameters；
3rd, Data Processing Method
Due to there are various current components in zinc oxide resistance sheet leakage current, therefore by oscillograph and accurate sampling electricity
Resistance, achieves the voltage waveform and the leakage current waveform by zinc oxide resistance sheet acted on zinc oxide resistance sheet.
In the present embodiment, all measurement current values take peak value.
Follow current peak value can be read by current waveform, and the measurement of current in resistance property peak value then adopts capacitive current compensation
Method, its principle are exactly that the capacity current in follow current is fully compensated, to obtain current in resistance property.Principle can be by following public affairs
Formula (3) is represented：
In formula, usfIt is on spark gap obtained by voltage phase shift, to be allowed to consistent with capacity current phase place, phase shift angle is 90 °；ix
It is total current value；G is penalty coefficient.The just only remaining current in resistance property i when capacity current is it often fully compensatedr, i.e.,：
ir=ix-ic=ix-Gusf (4)
Penalty coefficient G can be obtained by formula (3), resistive current component be tried to achieve using formula (4).
In real data process, first have to the voltage signal and current signal of acquisition are carried out FFT point using Matlab
Solution, after decomposition, according to Fourier transformation correspondence relation, can read respective frequencies component voltage or current component from frequency spectrum table
Peak value, carries out phase shift post-compensation further according to angle relationship between voltage and current, to obtain the resistive base in zinc oxide resistance sheet
Ripple electric current and resistive tertiary current numerical value.I.e.：
ir1=ix1-ic1=ix1-Gusf1 (5)
ir3=ix3-ic3=ix3-Gusf3 6)
Idiographic flow is as shown in figure 3, realize that step is as follows：
1) voltage waveform and full current waveform are measured；
2) voltage and current waveform are carried out into FFT decomposition, obtains fundamental wave and triple-frequency harmonics respectively；
3) phase shift is carried out to voltage fundamental signal and obtains usf1, it is allowed to consistent with capacity current phase place；
4) capacity current is compensated, penalty coefficient is G, obtains resistive fundamental current ir1；
5) voltage triple-frequency harmonics is carried out into phase shift post-compensation capacity current in the same manner, resistive triple harmonic current i is obtainedr3。
Claims (7)
1. a kind of metal oxide arrester live detection efficiency assay system, it is characterised in that including DC experiment loop
With ac test component, the DC experiment loop includes AC portion and rectifying part, realizes that metal oxide arrester is tried
The measurement of leakage current under product DC voltage, the ac test component include AC Test Circuits and high-low temperature test chamber, institute
State metal oxide arrester test product to be arranged in high-low temperature test chamber, realize extraneous factor to metal oxide arrester test product
The test of the impact of characteristic parameter.
2. metal oxide arrester live detection efficiency assay system according to claim 1, it is characterised in that institute
The AC portion for stating DC experiment loop is identical with the structure of AC Test Circuits, including alternating current power supply component, protective resistance,
Sample resistance, capacitive divider and oscillograph, the alternating current power supply component, protective resistance, capacitive divider form loop, described
In parallel with capacitive divider after metal oxide arrester test product and sample resistance series connection, the oscillograph connects sampling electricity respectively
Resistance two ends and the secondary terminals of capacitive divider.
3. metal oxide arrester live detection efficiency assay system according to claim 2, it is characterised in that institute
The rectifying part for stating DC experiment loop includes rectification silicon stack and commutation capacitor, and anode and the protective resistance of the rectification silicon stack connect
Connect, negative electrode connects metal oxide arrester test product and commutation capacitor one end, the commutation capacitor other end and alternating current respectively
Source component connects.
4. metal oxide arrester live detection efficiency assay system according to claim 2, it is characterised in that institute
Power supply, pressure regulator and transformator that alternating current power supply component includes being sequentially connected is stated, the transformator is isolating transformer.
5. metal-oxide thunder device live detection efficiency assay system according to claim 2, it is characterised in that described
Realize that the measurement of leakage current under metal oxide arrester test product DC voltage is specially：
A1 alternating current power supply component is adjusted), by oscillograph so that metal oxide arrester test product electric current is 1mA, electric capacity is recorded
Secondary terminal voltage u of potentiometer2, obtain the direct current 1mA reference voltages of metal oxide arrester test product；
A2) continue to adjust alternating current power supply component, the secondary terminal voltage for making capacitive divider is 0.75u2, record sample resistance two ends
Voltage, obtains the leakage current under 75% DC reference voltage of metal oxide arrester test product.
6. metal oxide arrester live detection efficiency assay system according to claim 2, it is characterised in that institute
The test for stating the impact for realizing extraneous factor to metal oxide arrester test product characteristic parameter is specially：
B1 alternating current power supply component is adjusted), the longtime running voltage of metal-loaded Oxide Arrester test product, by thermocycling
Case changes metal oxide arrester test product temperature, measures the leakage current of metal oxide arrester test product, studies temperature pair
The impact of metal oxide arrester test product characteristic parameter；
B2 alternating current power supply component is adjusted), the temperature-resistant of metal oxide arrester test product is kept, changes metal-loaded oxide
Spark gap test product working voltage, measures the leakage current of metal oxide arrester test product, and research chargeability is to metal-oxide
The impact of spark gap test product characteristic parameter；
B3) the continuous running voltage of metal-loaded Oxide Arrester test product, changes metal oxide arrester test product surface dirty
Dirty degree, measures the leakage current of metal oxide arrester test product, and research metal oxide arrester test product external insulation surface is dirty
Impact of the dirty degree to metal oxide arrester test product characteristic parameter.
7. metal oxide arrester live detection efficiency assay system according to claim 4, it is characterised in that institute
Transformator maximum output voltage is stated for 20kV.
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Cited By (4)
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| CN107860986A (en) * | 2017-09-21 | 2018-03-30 | 天津市电力科技发展有限公司 | A kind of Zinc-Oxide Arrester aging assessment |
| CN110531209A (en) * | 2019-09-23 | 2019-12-03 | 南方电网科学研究院有限责任公司 | A kind of arrester resistor-piece side glaze leakage current test macro |
| CN112649669A (en) * | 2020-12-21 | 2021-04-13 | 汪锐 | Lightning arrester live-line detection method based on primary phase angle measurement |
| CN113125916A (en) * | 2021-04-25 | 2021-07-16 | 西安交通大学 | Lightning arrester test device with direct current superposition impact |
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Cited By (4)
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| CN113125916A (en) * | 2021-04-25 | 2021-07-16 | 西安交通大学 | Lightning arrester test device with direct current superposition impact |
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