CN107656230A - The zero standard signal calibration device and its calibration method of a kind of partial discharge test system - Google Patents
The zero standard signal calibration device and its calibration method of a kind of partial discharge test system Download PDFInfo
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- CN107656230A CN107656230A CN201711093068.9A CN201711093068A CN107656230A CN 107656230 A CN107656230 A CN 107656230A CN 201711093068 A CN201711093068 A CN 201711093068A CN 107656230 A CN107656230 A CN 107656230A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The present invention relates to shelf depreciation technical field of measurement and test, more particularly to the zero standard signal calibration device and its calibration method of a kind of partial discharge test system, the device includes low-tension supply, frequency converter, exciting transformer, reactor, corona discharge model, voltage measurement system, coupled capacitor device, input block and instrument for measuring partial discharge；The present invention realizes zero standard position and quickly and accurately calibrated, and meets the needs at power test scene, effectively increases the accuracy rate and efficiency of partial discharge test job；Make partial discharge testing system that there is higher measurement sensitivity using discharge capacity calibration, being capable of accurate measurement partial discharge quantity；Using zero standard position correction, shelf depreciation collection of illustrative plates is concentrated on 0~90 °, in 180 °~270 ° of phase range, be easy to exclusive PCR, identify electric discharge type；Using the corona discharge model of tungsten copper electrode, for a long time, stably discharge it can facilitate look at the repeatability and stability of partial discharge testing system, be also beneficial to zero standard position correction.
Description
Technical field
The present invention relates to shelf depreciation technical field of measurement and test, and in particular to a kind of zero standard signal of partial discharge test system
Calibrating installation and its calibration method.
Background technology
In the insulation system of electrical equipment, the electric-field intensity at each position is often unequal, when the electricity of regional area
When field intensity reaches the disruptive field intensity of the Region Medium, electric discharge just occurs in the region, but this electric discharge is not electric through applying
Between two conductors of pressure, i.e., whole insulation system does not puncture, remains in that insulating properties, and this phenomenon is referred to as local put
Electricity.Occur to be referred to as internal shelf depreciation in insulator；Occur to be referred to as surface shelf depreciation in insulator surface；Occur
Conductor edge and surrounding be all gas, what be can be described as is corona.Shelf depreciation can gradual burn into damage insulating materials, make to put
Electric region constantly expands, and ultimately results in whole insulator breakdown.Therefore, it is necessary to shelf depreciation is limited under certain level.
High voltage electrical equipment is all classified as the measurement of shelf depreciation the important indicator to check the quality of the products, to be done when product not only dispatches from the factory
Partial discharge test, and also often to be measured after putting into operation.
The shelf depreciation of test product typically occurs in 0~90 ° of test voltage, in 180 °~270 ° of phase range, with experiment
The phase of voltage has close ties.Tester knows the zero phase i.e. zero standard of test voltage in measurement of partial discharge, right
Identification shelf depreciation and interference are very beneficial.Accordingly, it is determined that the zero standard of test voltage is an important ring in measurement of partial discharge
Section, when carrying out measurement of partial discharge every time, it all should determine that zero standard.But most of PD meter does not have internal zero standard calibrating installation,
Need to carry out outside zero standard calibration, and outside zero standard calibration method rarely has the introduction of carry out system, scene uses outer in practice
The empirical method of portion's zero standard calibration is hot end one metal fine of suspension in coupled capacitor, is suspended or close to grounded metal
Plate, zero standard calibration is carried out according to position of the electric discharge figure in ellipse after pressurization, but this method has the easy scaling loss of metal fine
Guiding discharge figure is unstable or discharges the problems such as of short duration.
The content of the invention
In order to solve the above problems, the invention provides a kind of zero standard signal calibration device of partial discharge test system and
Its calibration method, concrete technical scheme are as follows：
A kind of zero standard signal calibration device of partial discharge test system includes low-tension supply, frequency converter, exciting transformer, reactance
Device, corona discharge model, voltage measurement system, coupled capacitor device, input block and instrument for measuring partial discharge；The low tension
Source, frequency converter, exciting transformer are sequentially connected；The high-pressure side of exciting transformer, the high-pressure side of reactor, voltage measurement system
High-pressure side, the high-pressure side of coupled capacitor device be sequentially connected, exciting transformer, reactor, voltage measurement system, coupled capacitor device
Earth terminal is grounded；The high-field electrode of the corona discharge model is connected with the high-pressure side of the coupled capacitor device, and the corona is put
The earthing pole ground connection of electric model；The voltage measurement system includes divider and voltmeter, the high-pressure side of the divider and institute
The connection of reactor high-pressure side is stated, the voltmeter is connected with the divider low-voltage output；The input of the input block
It is connected with the coupled capacitor device low-voltage output, the output end of the input block is connected with the instrument for measuring partial discharge.
Preferably, the low-tension supply is three-phase four-wire system, single-phase 220V, three-phase 380V power frequency supply.
Preferably, the frequency converter is connected with three-phase 380V or single-phase 220V low-tension supply.
Preferably, the voltmeter is connected with single-phase 220V low-tension supply.
Preferably, the instrument for measuring partial discharge is connected with single-phase 220V low-tension supply.
Preferably, the corona discharge model is pin-plate discharging model or suspended discharge model,
Preferably, the high-field electrode of the corona discharge model, the making material of earthing pole are tungsten copper.
A kind of calibration method of the zero standard signal calibration device of partial discharge test system comprises the following steps：
（1）Test voltage is not added with, instrument for measuring partial discharge enters calibration mode of operation, and the when base of instrument for measuring partial discharge is shown
Mode elects " ellipse " as, and timebase frequency is placed in 50Hz, and the output end for calibrating impulse generator is connected into coupled capacitor device respectively
High-pressure side and earth terminal, calibration impulse generator is opened, the gain of instrument for measuring partial discharge is adjusted, makes instrument for measuring partial discharge
The test value of partial discharge quantity is consistent with the discharge capacity of calibration impulse generator output, hereafter, keeps instrument for measuring partial discharge
Gain is motionless, and removes calibration impulse generator；
（2）Instrument for measuring partial discharge enters measurement of partial discharge mode of operation, applies test voltage, and recorded in boost process
Phase of the corona discharge figure of corona discharge model on the oval figure of instrument for measuring partial discharge, if corona discharge figure goes out
When ellipse schemes upper non-270 ° of phases now, adjusted as follows：
When corona discharge figure is appeared on oval figureθDuring phase, at parameter setting area of instrument for measuring partial discharge, base rotates
Ellipse is set to turn clockwise in moduleβAngle,βFor：θAt≤180 °,β=(270-θ)°；θ>At 180 °,β=(630- θ) °, then it is electric
Corona is graphically displayed at 270 ° of phases；
Adjustment makes detecting system supply voltage phase shift more than, with the same identical polar of test voltage, now, oval figure left end point
Positive zero standard red line is test voltage zero phase, and oval right endpoint negative zero mark red line is 180 ° of phases of test voltage；
（3）Test voltage is reduced to zero, and the discharging rod after being grounded using earth terminal is discharged coupled capacitor device high-pressure side, then
Corona discharge model is removed, next can carry out shelf depreciation test to test product.
Beneficial effects of the present invention are：
The invention provides the zero standard signal calibration device and its calibration method of a kind of partial discharge test system, zero standard is realized
Position is quickly and accurately calibrated, meet power test scene needs, effectively increase partial discharge test job accuracy rate and
Efficiency.Make partial discharge testing system that there is higher measurement sensitivity using discharge capacity calibration in the present invention, being capable of accurate measurement office
Portion's discharge capacity；Using zero standard position correction, shelf depreciation collection of illustrative plates is set to concentrate on 0~90 °, in 180 °~270 ° of phase range,
It is easy to exclusive PCR, identifies electric discharge type；, can for a long time, stably using the pin-plate or suspended discharge model of tungsten copper electrode
Electric discharge, facilitates look at the repeatability and stability of partial discharge testing system, is also beneficial to zero standard position correction.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the zero standard signal calibration device of partial discharge test system in the present invention.
Embodiment
In order to be better understood from the present invention, the invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of zero standard signal calibration device of partial discharge test system includes low-tension supply, frequency converter, excitation
Transformer, reactor, corona discharge model, voltage measurement system, coupled capacitor device, input block and instrument for measuring partial discharge；
The low-tension supply, frequency converter, exciting transformer are sequentially connected；The high-pressure side of exciting transformer, the high-pressure side of reactor, voltage
The high-pressure side of measuring system, the high-pressure side of coupled capacitor device are sequentially connected, exciting transformer, reactor, voltage measurement system, coupling
Close the earth terminal ground connection of capacitor；The high-field electrode of corona discharge model and the high-pressure side of coupled capacitor device connect, corona discharge
The earthing pole ground connection of model；Voltage measurement system includes divider and voltmeter, high-pressure side and the reactor high-pressure side of divider
Connection, voltmeter are connected with divider low-voltage output；The input of input block is connected with coupled capacitor device low-voltage output,
The output end of input block is connected with instrument for measuring partial discharge, it is preferred that input block is that RLC types detect impedance, connecting line
For 50 ohm coaxial cables.Wherein low-tension supply is three-phase four-wire system, single-phase 220V, three-phase 380V power frequency supply.Wherein, become
Frequency device is connected with three-phase 380V or single-phase 220V low-tension supply.Voltage measurement system is connected with single-phase 220V low-tension supply.
Instrument for measuring partial discharge is connected with single-phase 220V low-tension supply.
Corona discharge model is pin-plate discharging model or suspended discharge model, the high-field electrode of corona discharge model, is grounded
The making material of pole is tungsten copper.
A kind of calibration method of the zero standard signal calibration device of partial discharge test system comprises the following steps：
（1）Test voltage is not added with, instrument for measuring partial discharge enters calibration mode of operation, and the when base of instrument for measuring partial discharge is shown
Mode elects " ellipse " as, and timebase frequency is placed in 50Hz, and the output end for calibrating impulse generator is connected into coupled capacitor device respectively
High-pressure side and earth terminal, calibration impulse generator is opened, the gain of instrument for measuring partial discharge is adjusted, makes instrument for measuring partial discharge
The test value of partial discharge quantity is consistent with the discharge capacity of calibration impulse generator output, hereafter, keeps instrument for measuring partial discharge
Gain is motionless, and removes calibration impulse generator.
（2）Instrument for measuring partial discharge enters measurement of partial discharge mode of operation, applies test voltage, and in boost process
Phase of the corona discharge figure of corona discharge model on the oval figure of instrument for measuring partial discharge is recorded, if corona discharge figure
When shape appears in non-270 ° of phases on oval figure, adjusted as follows：
When corona discharge figure is appeared on oval figureθDuring phase, at parameter setting area of instrument for measuring partial discharge, base rotates
Ellipse is set to turn clockwise in moduleβAngle,βFor：θAt≤180 °,β=(270-θ)°；θ>At 180 °,β=(630- θ) °, then it is electric
Corona is graphically displayed at 270 ° of phases；When corona discharge figure appears in oval 90 ° of phases, in PD meter parameter setting area
When base rotary module in ellipse is turned clockwise 180 °, then corona discharge is graphically displayed at 270 ° of phases.
Adjustment makes detecting system supply voltage phase shift more than, and with the same identical polar of test voltage, now, ellipse figure is left
The positive zero standard red line of end points is test voltage zero phase, and oval right endpoint negative zero mark red line is 180 ° of phases of test voltage.
（3）Test voltage is reduced to zero, and the discharging rod after being grounded using earth terminal is discharged coupled capacitor device high-pressure side,
Then corona discharge model is removed, next can carry out shelf depreciation test to test product.
The present invention is not limited to above-described embodiment, the foregoing is only the preferable case study on implementation of the present invention
, it is not intended to limit the invention, any modification for being made within the spirit and principles of the invention, equivalent substitution and changes
Enter, should be included in the scope of the protection.
Claims (8)
- A kind of 1. zero standard signal calibration device of partial discharge test system, it is characterised in that：Including low-tension supply, frequency converter, Exciting transformer, reactor, corona discharge model, voltage measurement system, coupled capacitor device, input block and local discharge test Instrument；The low-tension supply, frequency converter, exciting transformer are sequentially connected；The high-pressure side of exciting transformer, the high-pressure side of reactor, The high-pressure side of voltage measurement system, the high-pressure side of coupled capacitor device are sequentially connected, and the exciting transformer, reactor, voltage are surveyed The earth terminal ground connection of amount system, coupled capacitor device；The high-field electrode of the corona discharge model and the high-pressure side of coupled capacitor device Connection, the earthing pole ground connection of corona discharge model；The voltage measurement system includes divider and voltmeter, the divider High-pressure side is connected with the reactor high-pressure side, and the voltmeter is connected with the divider low-voltage output；The input is single The input of member is connected with the coupled capacitor device low-voltage output, and the output end of the input block is surveyed with the shelf depreciation Try instrument connection.
- A kind of 2. zero standard signal calibration device of partial discharge test system according to claim 1, it is characterised in that：Institute It is three-phase four-wire system to state low-tension supply, single-phase 220V, three-phase 380V power frequency supply.
- A kind of 3. zero standard signal calibration device of partial discharge test system according to claim 2, it is characterised in that：Institute The low-tension supply that frequency converter is stated with three-phase 380V or single-phase 220V is connected.
- A kind of 4. zero standard signal calibration device of partial discharge test system according to claim 2, it is characterised in that：Institute The low-tension supply that voltmeter is stated with single-phase 220V is connected.
- A kind of 5. zero standard signal calibration device of partial discharge test system according to claim 2, it is characterised in that：Institute The low-tension supply that instrument for measuring partial discharge is stated with single-phase 220V is connected.
- A kind of 6. zero standard signal calibration device of partial discharge test system according to claim 1, it is characterised in that：Institute It is pin-plate discharging model or suspended discharge model to state corona discharge model.
- A kind of 7. zero standard signal calibration device of partial discharge test system according to claim 1, it is characterised in that：Institute State the high-field electrode of corona discharge model, the making material of earthing pole is tungsten copper.
- 8. a kind of calibration method of the zero standard signal calibration device of any described partial discharge test systems of claim 1-7, It is characterized in that：Comprise the following steps：（1）Test voltage is not added with, instrument for measuring partial discharge enters calibration mode of operation, and the when base of instrument for measuring partial discharge is shown Mode elects " ellipse " as, and timebase frequency is placed in 50Hz, and the output end for calibrating impulse generator is connected into coupled capacitor device respectively High-pressure side and earth terminal, calibration impulse generator is opened, the gain of instrument for measuring partial discharge is adjusted, makes instrument for measuring partial discharge The test value of partial discharge quantity is consistent with the discharge capacity of calibration impulse generator output, hereafter, keeps instrument for measuring partial discharge Gain is motionless, and removes calibration impulse generator；（2）Instrument for measuring partial discharge enters measurement of partial discharge mode of operation, applies test voltage, and recorded in boost process Phase of the corona discharge figure of corona discharge model on the oval figure of instrument for measuring partial discharge, if corona discharge figure goes out When ellipse schemes upper non-270 ° of phases now, adjusted as follows：When corona discharge figure is appeared on oval figureθDuring phase, at parameter setting area of instrument for measuring partial discharge, base rotates Ellipse is set to turn clockwise in moduleβAngle,βFor：θAt≤180 °,β=(270-θ)°；θ>At 180 °,β=(630- θ) °, then it is electric Corona is graphically displayed at 270 ° of phases；Adjustment makes detecting system supply voltage phase shift more than, with the same identical polar of test voltage, now, oval figure left end point Positive zero standard red line is test voltage zero phase, and oval right endpoint negative zero mark red line is 180 ° of phases of test voltage；（3）Test voltage is reduced to zero, and the discharging rod after being grounded using earth terminal is discharged coupled capacitor device high-pressure side, then Corona discharge model is removed, next can carry out shelf depreciation test to test product.
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Cited By (2)
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| CN109143140A (en) * | 2018-07-23 | 2019-01-04 | 北方夜视技术股份有限公司 | Day, blind ultraviolet imager detected the caliberating device and scaling method of consistency |
| CN116298741A (en) * | 2023-03-14 | 2023-06-23 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
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Cited By (3)
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|---|---|---|---|---|
| CN109143140A (en) * | 2018-07-23 | 2019-01-04 | 北方夜视技术股份有限公司 | Day, blind ultraviolet imager detected the caliberating device and scaling method of consistency |
| CN116298741A (en) * | 2023-03-14 | 2023-06-23 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
| CN116298741B (en) * | 2023-03-14 | 2023-10-31 | 青岛艾诺仪器有限公司 | Insulator partial discharge detection method |
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Application publication date: 20180202 |