CN102590718B - System for GIS (Global Information System) partial discharge measurement and VFTO (Very Fast Transient Overvoltage) measurement - Google Patents

System for GIS (Global Information System) partial discharge measurement and VFTO (Very Fast Transient Overvoltage) measurement Download PDF

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CN102590718B
CN102590718B CN201210042113.9A CN201210042113A CN102590718B CN 102590718 B CN102590718 B CN 102590718B CN 201210042113 A CN201210042113 A CN 201210042113A CN 102590718 B CN102590718 B CN 102590718B
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vfto
measurement
partial discharge
gis
unit
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CN102590718A (en
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李成榕
孙岗
马国明
陈国强
孙泽来
郭攀辉
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State Grid Corp of China SGCC
North China Electric Power University
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State Grid Corp of China SGCC
North China Electric Power University
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Abstract

The invention discloses a system for GIS (Global Information System) partial discharge measurement and VFTO (Very Fast Transient Overvoltage) measurement in the technical field of online monitoring systems of electric equipment. The system comprises a probe, a circuit selector, a partial discharge detection amplifying unit, a VFTO secondary partial pressure unit, a signal collecting and processing unit and an oscilloscope. The measurement system can use one probe to perform GIS partial discharge and VFTO measurement, and the two original systems are combined to the same system to reduce the GIS monitoring cost; the special probe design improves the measurement sensitivity of partial discharge; and the preferable VFTO secondary unit design improves the glancing flatness of wide frequency band measurement of a VFTO sensor.

Description

A kind of system for GIS measurement of partial discharge and VFTO measurement
Technical field
The invention belongs to electrical equipment online monitoring systems technology field, especially relate to a kind of system for GIS measurement of partial discharge and VFTO measurement.
Background technology
Cubicle Gas-Insulated Switchgear (GIS) has that floor area is little, environmental protection, life-span are long, be convenient to installation and maintenance, be easy to the advantages such as control, in China's electric system, widely applied, especially ultra-high voltage transformer station, generally adopts GIS, HGIS electrical equipment.In the present invention, inventor has proposed a kind of system of can be simultaneously measuring for GIS partial discharge monitoring and VFTO.
(1) measurement of partial discharge
GIS shelf depreciation refers to and occurs in the electric discharge phenomena in regional area in GIS insulation system, comprising: the electric discharge of free metal particle, floating potentical body electric discharge, creeping discharge, the electric discharge of insulating part internal air gap, metal tip electric discharge etc.
Utilize at present shelf depreciation to produce system and shortcoming thereof that electric signal is measured it both at home and abroad:
1) shell electrode method
Developed by Japan the eighties, its structure is on GIS shell, to lay insulation film and metal electrode, between shell and metal electrode, form an electric capacity, can be by high-frequency discharge signal coupling to detecting in impedance, the signal in this impedance can finally obtain GIS local discharging level through amplifying.The advantage of this method is simple in structure, comparatively practical, and its shortcoming is to be subject to external interference.
2) internal electrode method
Have two kinds of internal electrode methods.The first is developed by Britain for 1988, and the method is to install metal electrode additional in flange inside, and this electrode and shell form coupling capacitance, to extract the pulse signal of shelf depreciation.It two is developed in nineteen eighty-three by Japan, is near earth terminal pre-plugged electrode in disc insulator.Its advantage is good in anti-interference performance, highly sensitive.Shortcoming be interior electrode can only be in manufacturer production process pre-plugged, complex structure, on-the-spot installation is often difficult for realizing.
3) external impressed current sensor method
When GIS is inner while producing shelf depreciation, on ground wire, there is high-frequency current to pass through, therefore can utilize Rogowski Coil with core materials such as magnetic ferrites as this high-frequency signal of sensor measurement.The advantage of sensor is that can in very wide frequency range, to keep good transport property, shortcoming be that ground wire need be through coil, bring inconvenience to on-the-spot use.
(2) VFTO measures
When disconnector in GIS, grounding switch and breaker operator, can produce the very very fast transient overvoltage (VFTO) of large (the wave head time can be low to moderate several ns), frequency very high (reaching as high as MHz up to a hundred) of amplitude higher (reaching as high as 3p.u.), steepness.
VFTO measuring system and the shortcoming thereof of domestic and international application in GIS at present:
1) GIS hand window formula capacitance partial pressure method
The method is installed induction electrode in advance at GIS hand window position.Between induction electrode and GIS high pressure guide rod, form an electric capacity, also form an electric capacity with GIS grounding shell.Two electric capacity can form a voltage divider system.The method needs in advance at the hand window place of GIS sensor installation, for the GIS transformer station having put into operation, applies and has difficulties.
2) bottom shielding of bushing formula VFTO sensor
The method has been utilized the capacitance plate in the outlet casing tube of transformer or reactor.Capacitance plate is the equal of the electric capacity being connected between high-pressure conductor and the earth.The end shield terminal of capacitance plate is removed to ground connection, seal in after a large electric capacity ground connection again.Between the electric capacity of capacitance plate and external large electric capacity, form a capacitive divider, can realize the measurement to VFTO.The method can only be measured the outside VFTO of GIS, can not be used for measuring the VFTO of GIS inside, and it is low to measure frequency band, and high-frequency cut-off frequency is several MHz.
3) the pre-buried ring type capacitance partial pressure of disc insulator method
The method need to be used the disc insulator that is embedded with becket.In the epoxy resin of insulator, there is embedding in advance becket.Between it and high pressure guide rod, form coupling capacitance, on becket, connect after large electric capacity, and form a capacitive divider, finally realize VFTO and measure.The method theoretical bandwidth can reach 20MHz, has resonance but actual calibration result shows its measuring system near 2MHz, and its high-frequency cut-off frequency only has 2MHz.
To sum up, the shortcoming of prior art is to measure in order to carry out shelf depreciation and VFTO, on GIS cavity, need to install two cover measuring equipments, increased equipment cost, the uniform electric field having destroyed in GIS cavity distributes, for the equipment that puts into operation, the required transformation of the system that installs and measures is more difficult.Existing VFTO measuring system frequency band can not meet practical measurement requirement in addition.
Summary of the invention
What exist for the existing Partial Discharge Measurement System of mentioning in above-mentioned background technology is subject to external interference, complex structure, the on-the-spot shortcomings such as difficulty of installing, and VFTO measuring system is measured frequency band deficiency, difficult shortcoming is installed at scene, the present invention proposes a kind of system for GIS measurement of partial discharge and VFTO measurement.
Technical scheme of the present invention is a kind of system for GIS measurement of partial discharge and VFTO measurement, it is characterized in that this system comprises probe, path selector switch, Partial Discharge Detection amplifying unit, VFTO second divided voltage unit, signal acquisition process unit and oscillograph;
Described probe is connected with path selector switch; Path selector switch is connected with Partial Discharge Detection amplifying unit and VFTO second divided voltage unit respectively; Partial Discharge Detection amplifying unit is connected with signal acquisition process unit; VFTO second divided voltage unit is connected with oscillograph.
Described probe is made up of the metal electrode, dielectric material and the shell that stretch in GIS cavity;
Described dielectric material is organic material, for improving measurement of partial discharge sensitivity; Shell and GIS pull out mouth and are bolted, and shell is the earthing pole of probe; The front end of the metal electrode of probe is used for making UHF frequency-region signal to produce resonance on probe, and the angle between inclined-plane and the plane of the front end of metal electrode is 5 ° to 15 °, for reducing to pull out the shielding effectiveness of oral cavity body wall to probe; Metal electrode is positioned at GIS inside, for eliminating external interference to the impact of measuring.
The wave impedance value of described metal electrode front portion is identical with the admittance wave resistance value of VFTO second divided voltage unit with the admittance wave resistance value of the wave impedance value of the remainder of metal electrode, Partial Discharge Detection amplifying unit.
Described path selector switch is in the time carrying out VFTO measurement, and path selector switch transfers signals to VFTO second divided voltage unit; In the time not carrying out VFTO measurement, path selector switch transfers signals to Partial Discharge Detection amplifying unit, and path selector switch is that passive device maybe can be by the signal shunt of Long-distance Control.
Described Partial Discharge Detection amplifying unit inside is useful on the element to local discharge signal amplification demodulator, after small high frequency partial discharge signal is amplified, is converted to rectified signal, and its measurement of partial discharge sensitivity can reach 5 skin coulombs.
Described Partial Discharge Detection amplifying unit front end is equipped with protection equipment, for preventing the impact of high-voltage signal on Partial Discharge Detection amplifying unit.
Described VFTO second divided voltage unit is for VFTO dividing potential drop, and probe forms high-voltage arm electric capacity with GIS cavity inner guide, and VFTO second divided voltage unit includes low-voltage arm electric capacity, and high-voltage arm electric capacity and low-voltage arm electric capacity form capacitive divider.
Inside, described VFTO second divided voltage unit comprises impedance transformer, makes capacitance partial pressure VFTO measure low-frequency cut-off frequency below 0.01Hz; VFTO second divided voltage unit is the automatic shorted to earth of output port in the time of non-measurement, prevents the situation of port heart yearn in noble potential; The symmetrical capacitance structure design of the inner employing in VFTO second divided voltage unit, increases wire widths, reduces wire length, reduces overall inductance, and VFTO measures high-frequency cut-off frequency more than 100MHz.
Described signal acquisition process unit is for carrying out data storage and statistical study to Partial Discharge Detection amplifying unit output signal; For the local discharge signal of metallic particles, floating potential, inner corona, solid insulation inherent vice or the solid insulation dirty generation in surface is classified; The interference of electric discharge in short-term that floating current potential body electric discharge is disturbed or switching manipulation produces existing for suppressing radio interference, transformer station's high voltage environment of mobile communication and radar; Its output data comprise and form the power frequency period oscillogram of shelf depreciation, two-dimentional spectrogram, three-dimensional spectrum, Classifcation of flaws result and far.
More than described oscillograph sample frequency is greater than 1GHz, data storage depth is greater than 100M bytes.
The present invention proposes and a kind ofly can carry out based on a probe system that in GIS, shelf depreciation and VFTO are measured simultaneously, two original cover systems are merged into same system, reduced GIS monitoring cost; By special probe designs, improve the sensitivity of measurement of partial discharge; By VFTO second divided voltage Unit Design, improve the flatness of VFTO sensor broadband measurement, expand Measurement bandwidth.
Accompanying drawing explanation
Fig. 1 is the probe scheme of installation of one embodiment of the present of invention;
Fig. 2 is the measuring system connection diagram of one embodiment of the present of invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 1 shows probe scheme of installation according to an embodiment of the invention, and system probe comprises metal electrode (110), dielectric material (120), shell (130) and signal output port (140).In the time that measuring system is installed, systematic survey probe is fixed by bolts on GIS cavity (150).This probe can be measured the transient overvoltage on electromagnetic wave or the GIS inner guide (160) of local discharge generation.
Fig. 2 shows according to one embodiment of present invention, comprise: probe (210), path selector switch (220), Partial Discharge Detection amplifying unit (230), VFTO second divided voltage unit (240), signal acquisition process unit (250), oscillograph (260), wherein:
Probe (210), for local discharge signal and the VFTO signal of being coupled, is made up of the metal electrode, dielectric material, shell and the signal output port that stretch in GIS cavity.Metal electrode is for signal coupling, and its material can be aluminium, the low material of copper constant resistance rate; Dielectric material is preferred organic material, to improve measurement of partial discharge sensitivity; The shape of optimal design probe metal part and shape and the thickness of dielectric material, make UHF frequency-region signal can produce resonance on probe, improves measurement of partial discharge sensitivity.Because probe is positioned at GIS inside, eliminate external interference to the impact of measuring.
Path selector switch (220), select for probe output path, in the time carrying out VFTO measurement, path selector switch transfers signals to VFTO second divided voltage unit, in the time not carrying out VFTO measurement, path selector switch transfers signals to Partial Discharge Detection amplifying unit, and described path selector switch is that passive device maybe can be by the signal shunt of Long-distance Control.
Partial Discharge Detection amplifying unit (230), for the amplification demodulator to local discharge signal, small high frequency partial discharge signal is amplified, be converted to the rectified signal of easy collection, by the amplification wave band of selecting to mate with probe, the sensitivity of sensor measurement of partial discharge can reach 5 skin coulombs.At detecting amplifier leading portion, protection equipment is housed, prevents the impact of high-voltage signal on Partial Discharge Detection amplifying unit.
VFTO second divided voltage unit (240), for VFTO dividing potential drop, probe forms high-voltage arm electric capacity with GIS cavity inner guide, and VFTO second divided voltage unit includes low-voltage arm electric capacity, and both form capacitive divider.Included the preferred arrangement of low-voltage arm electric capacity and adopted the elements such as impedance transformer by described VFTO second divided voltage unit, making capacitance partial pressure VFTO measure high-frequency cut-off frequency up to more than 100MHz, low-frequency cut-off frequency is below 0.01Hz.VFTO second divided voltage unit output port in the time carrying out VFTO measurement is connected with oscillograph acquisition system by cable, output port short circuit when non-measurement.
Signal acquisition process unit (250), for carrying out data storage and statistical study to Partial Discharge Detection amplifying unit output signal.Its local discharge signal that can produce typical defects such as metallic particles, floating potential, inner corona, solid insulation inherent vice, solid insulation surface are dirty is classified, and the electric discharge in short-term that floating current potential body electric discharge is disturbed, switching manipulation produces that can suppress to exist in the radio interference such as mobile communication and radar, transformer station's high voltage environment is disturbed.Its output data comprise and form the power frequency period oscillogram of shelf depreciation, two-dimentional spectrogram (φ-q figure and φ-n scheme), three-dimensional spectrum (φ-q-n schemes or multicycle stretch-out view), Classifcation of flaws result and far.
The features such as oscillograph (260), has sample frequency high (more than GHz), data storage depth large (more than 100Mbytes), meet the needs that record VFTO complete procedure.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (9)

1. for a system for GIS measurement of partial discharge and VFTO measurement, it is characterized in that this system comprises probe, path selector switch, Partial Discharge Detection amplifying unit, VFTO second divided voltage unit, signal acquisition process unit and oscillograph;
Described probe is connected with path selector switch; Path selector switch is connected with Partial Discharge Detection amplifying unit and VFTO second divided voltage unit respectively; Partial Discharge Detection amplifying unit is connected with signal acquisition process unit; VFTO second divided voltage unit is connected with oscillograph;
Described probe is made up of the metal electrode, dielectric material and the shell that stretch in GIS cavity; Shell and GIS pull out mouth and are bolted, and shell is the earthing pole of probe; Metal electrode is positioned at GIS inside, for eliminating external interference to the impact of measuring;
Described VFTO second divided voltage unit is for VFTO dividing potential drop, and probe forms high-voltage arm electric capacity with GIS cavity inner guide, and VFTO second divided voltage unit includes low-voltage arm electric capacity, and high-voltage arm electric capacity and low-voltage arm electric capacity form capacitive divider; The symmetrical capacitance structure design of the inner employing in VFTO second divided voltage unit, increases wire widths, reduces wire length, reduces overall inductance.
2. a kind of system for GIS measurement of partial discharge and VFTO measurement according to claim 1, is characterized in that described dielectric material is organic material, for improving measurement of partial discharge sensitivity; The front end of the metal electrode of described probe is used for making UHF frequency-region signal to produce resonance on probe, and the angle between inclined-plane and the plane of the front end of metal electrode is 5 ° to 15 °, for reducing to pull out the shielding effectiveness of oral cavity body wall to probe.
3. a kind of system for GIS measurement of partial discharge and VFTO measurement according to claim 2, is characterized in that the wave impedance value of described metal electrode front portion is identical with the admittance wave resistance value of VFTO second divided voltage unit with the admittance wave resistance value of the wave impedance value of the remainder of metal electrode, Partial Discharge Detection amplifying unit.
4. a kind of system for GIS measurement of partial discharge and VFTO measurement according to claim 1, is characterized in that described path selector switch is in the time carrying out VFTO measurement, and path selector switch transfers signals to VFTO second divided voltage unit; In the time not carrying out VFTO measurement, path selector switch transfers signals to Partial Discharge Detection amplifying unit, and path selector switch is that passive device maybe can be by the signal shunt of Long-distance Control.
5. according to a kind of system for GIS measurement of partial discharge and VFTO measurement described in claim 1 or 4, it is characterized in that described Partial Discharge Detection amplifying unit inside is useful on the element to local discharge signal amplification demodulator, after small high frequency partial discharge signal is amplified, be converted to rectified signal, its measurement of partial discharge sensitivity can reach 5 skin coulombs.
6. a kind of system for GIS measurement of partial discharge and VFTO measurement according to claim 5, is characterized in that described Partial Discharge Detection amplifying unit front end is equipped with protection equipment, for preventing the impact of high-voltage signal on Partial Discharge Detection amplifying unit.
7. a kind of system for GIS measurement of partial discharge and VFTO measurement according to claim 1, is characterized in that inside, described VFTO second divided voltage unit comprises impedance transformer, makes capacitance partial pressure VFTO measure low-frequency cut-off frequency below 0.01Hz; VFTO second divided voltage unit is the automatic shorted to earth of output port in the time of non-measurement, prevents the situation of port heart yearn in noble potential; VFTO measures high-frequency cut-off frequency more than 100MHz.
8. according to a kind of system for GIS measurement of partial discharge and VFTO measurement described in claim 1 or 4, it is characterized in that described signal acquisition process unit is for carrying out data storage and statistical study to Partial Discharge Detection amplifying unit output signal; For the local discharge signal of metallic particles, floating potential, inner corona, solid insulation inherent vice or the solid insulation dirty generation in surface is classified; The interference of electric discharge in short-term that floating current potential body electric discharge is disturbed or switching manipulation produces existing for suppressing radio interference, transformer station's high voltage environment of mobile communication and radar; Its output data comprise and form the power frequency period oscillogram of shelf depreciation, two-dimentional spectrogram, three-dimensional spectrum, Classifcation of flaws result and far.
9. according to a kind of system for GIS measurement of partial discharge and VFTO measurement described in claim 1 or 4, more than it is characterized in that described oscillograph sample frequency is greater than 1GHz, data storage depth is greater than 100M bytes.
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