CN209102842U - A kind of PD signal monitoring system - Google Patents
A kind of PD signal monitoring system Download PDFInfo
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- CN209102842U CN209102842U CN201821554976.3U CN201821554976U CN209102842U CN 209102842 U CN209102842 U CN 209102842U CN 201821554976 U CN201821554976 U CN 201821554976U CN 209102842 U CN209102842 U CN 209102842U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
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- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 8
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Abstract
The utility model discloses a kind of PD signal monitoring systems, it includes: pressure regulator T, and pressure regulator T is connect with external communication voltage AC, for adjusting the output voltage of external communication voltage AC；Separation filter, for being filtered to output voltage of the external alternating voltage AC after overregulating, separation filter is also connect with insulation defect discharging model separation filter；Insulation defect discharging model, the PD pulsed current signal generated for analog insulation defect；Insulation defect discharging model also utilizes coupled capacitor CkThe PD pulsed current signal that insulation defect generates is coupled to noninductive detection impedance ZmOn, and pass through noninductive detection impedance ZmIt the PD pulsed current signal of generation is converted into corresponding pulse voltage signal is output in oscillograph to show.The utility model can be realized the real-time monitoring to PD, and carry out quantitatively calibrating to PD amount.
Description
Technical field
The utility model relates to shelf depreciation technical field, especially a kind of PD signal monitoring system.
Background technique
SF6Gas is widely used in air insulating device due to its excellent insulation and arc extinction performance.However, SF6Gas
Body insulator arrangement (abbreviation SF6Electrical equipment, as gas insulated combined electrical equipment GIS, gas insulation breaker GCB, gas-insulated become
Depressor GIT and gas-insulated lines or pipeline GIL etc.) durings manufacture, transport, installation, maintenance and operation etc., inside is not
Will appear various insulation defects avoidablely, as on conductor metal burr, superstructure loosening or poor contact, conductor and support it is exhausted
Edge removes the residue after the air gap to be formed, maintenance and the intracorporal metal particle of chamber etc., these can all make SF6Inside equipment
Different degrees of insulation defect is formed, is distorted so as to cause equipment internal electric field, and then generates shelf depreciation (PD).When out
When existing serious PD, on the one hand, PD can accelerate the further destruction to equipment built-in electrical insulation, eventually lead to insulation fault and cause to stop
Electrification, to running SF6Equipment is a kind of potential hidden danger, there is the title of insulation " tumour "；On the other hand, PD is effective again
The characteristic quantity for characterizing insulation status, by SF6The PD of electrical equipment is detected and is carried out pattern-recognition, can be in very great Cheng
SF is found on degree6Insulation defect and type existing for inside equipment.Therefore, detection PD is to guarantee SF6Electrical equipment is securely and reliably transported
Row has important practical significance.
Utility model content
In view of the above drawbacks of the prior art, the purpose of this utility model is just to provide a kind of PD (shelf depreciation) signal
Monitoring system can be realized the real-time monitoring to PD, and carry out quantitatively calibrating to PD amount.
The purpose of this utility model is that technical solution in this way realizes that a kind of PD signal monitoring system, it includes
Have:
Pressure regulator T, the pressure regulator T is connect with external communication voltage AC, for adjusting the output of external communication voltage AC
Voltage；
Separation filter, the separation filter are used for the output voltage to external alternating voltage AC after overregulating and carry out
Filtering processing, the separation filter are also connect with insulation defect discharging model；
Insulation defect discharging model, the PD pulsed current signal generated for analog insulation defect；The insulation defect is put
Electric model also utilizes coupled capacitor CkThe PD pulsed current signal that insulation defect generates is coupled to noninductive detection impedance ZmOn, and
Pass through noninductive detection impedance ZmThe PD pulsed current signal of generation is converted into corresponding pulse voltage signal and is output to oscillograph
Middle display.
Further, shelf depreciation prover is additionally provided with inside the insulation defect discharging model；
The shelf depreciation prover is using the pulse current method in IEC60270 to the PD pulse current in monitoring system
Semaphore is calibrated.
Further, the separation filter includes first capacitor C1, the second capacitor C2 and first resistor R1；
The first capacitor C1 is in parallel with first resistor R1 again after connecting with the second capacitor C2.
Further, the monitoring system further includes having the gas chromatography-mass spectrometry for decomposing gas for real-time detection SF6 dynamic
Instrument GC/MS；
The gas chromatography-mass spectrometry moves instrument GC/MS and connect with the insulation defect discharging model.
Further, the insulation defect includes: insulator surface metal filth defect, insulator void defects and high pressure
Conductor protrusion insulation defect.
By adopting the above-described technical solution, the utility model has the advantage that
(1) the PD signal that typical defect generates inside the utility model energy Simulated GlS, and can quantitative detection discharge voltage and
Discharge capacity, SF6 gas decomposition product caused by PD can also pass through data correlation point by chromatographic detection system quantitative detection
Analysis can realize that diagnosing GIS device insulation fault with SF6 decomposition components content provides theories integration to be final；
(2) the utility model can be realized the real-time monitoring to PD, and carry out quantitatively calibrating to PD amount, by SF6Electricity
The PD of gas equipment is detected and is carried out pattern-recognition, it can be found that SF6Insulation defect and type existing for inside equipment.
Other advantages, target and feature of the utility model will be explained in the following description to a certain extent
It states, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from the practice of the utility model.
Detailed description of the invention
The Detailed description of the invention of the utility model is as follows:
Fig. 1 is the connection schematic diagram of PD signal monitoring system.
Fig. 2 is PD signal monitoring system alignment circuit diagram.
Fig. 3 is impulse current measurement calibration graph.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
As shown in Figure 1；A kind of PD signal monitoring system, it includes:
Pressure regulator T, pressure regulator T are connect with external communication voltage AC, for adjusting the output voltage of external communication voltage AC；
Separation filter, separation filter is for being filtered output voltage of the external alternating voltage AC after overregulating
Processing, separation filter are also connect with insulation defect discharging model；
Separation filter includes first capacitor C1, the second capacitor C2 and first resistor R1；
First capacitor C1 is in parallel with first resistor R1 again after connecting with the second capacitor C2.
Insulation defect discharging model, the PD pulsed current signal generated for analog insulation defect；Insulation defect electric discharge mould
Type also utilizes coupled capacitor CkThe PD pulsed current signal that insulation defect generates is coupled to noninductive detection impedance ZmOn, and pass through
Noninductive detection impedance ZmThe PD pulsed current signal of generation is converted into corresponding pulse voltage signal and is output to WavePro
Display in 7100XL digital storage oscilloscope (analog frequency band 1GHz, sample rate 20GHz, storage depth 48MB), to realize to PD
Real-time monitoring, and to PD amount carry out quantitatively calibrating.
Wherein, coupled capacitor be arranged in closed gas insulated combined electrical equipment (Gas Insulated Switchgear,
GIS) in gas chamber, guarantee under rated voltage, monitoring system partial discharge quantity PD itself is less than 2pC.
As shown in Figures 2 and 3, shelf depreciation prover is additionally provided with inside insulation defect discharging model；
Shelf depreciation prover is using the pulse current method in IEC60270 to the PD pulse electricity in above-mentioned PD signal detection
Stream semaphore is calibrated.
Monitoring system further includes having the gas chromatography-mass spectrometry for decomposing gas for real-time detection SF6 to move instrument GC/MS；
Gas chromatography-mass spectrometry moves instrument GC/MS and connect with insulation defect discharging model.
The influence of strength of discharge and duration: numerous studies think regardless of which type of discharge fault, SF at present6Point
It is all substantially proportional to discharge energy to solve gas product assay.China Electric Power Research Institute utilizes a 110kV1:1 within 2009
GIS functional failure simulation equipment, study the influence of strong and weak two kinds of PD intensity to gas decomposition product.It tests and applies twice
90kV voltage makes PD amount maintain metastable level, is 30pC when weaker wherein being 50~70pC when discharging stronger.This
One the result shows that gas decomposition product content be proportional to PD intensity and discharge period, be inversely proportional to electric discharge the indoor gas of gas it is total
Quality, PD intensity Q may be expressed as:
Q=km Δ p/ Δ t；
In formula, Δ p is concentration knots modification of the gas decomposition product within the Δ t time；M is the electric discharge total matter of the indoor gas of gas
Amount；K is conversion coefficient, depends on testing inspection result.Thus, it can be said that under the premise of not considering that adsorbent influences, if
SF6Discovery gas decomposition product content is in increase in insulator arrangement and gas production rate is when increasing, and may infer that there are PD activity,
And PD intensity is increasing, gas decomposes gas production rate and often doubles, and corresponds to PD intensity and increases by 50%.
Insulation defect includes: insulator surface metal filth defect, insulator void defects and high-pressure conductor protrusion
Insulation defect.
Specific embodiment 1, high-pressure conductor protrusion insulation defect.
High-pressure conductor protrusion insulation defect, abbreviation N (Needle) class defect.Refer to the weldering that GIS leaves in assembling process
Scar or biggish burr etc. can not be removed in cleaning test, and abnormal protruding point is just left in gas chamber.The harm of such defect compared with
Greatly, under metastability exchange voltage, protruding parts distribution forms local high field area in the electric field, when local electric field strength is greater than
When the dielectric strength of gas, PD will be caused.Since electric discharge only occurs in regional area without running through between entire electrode,
Therefore this corona seems relatively stable sometimes.
The true type GIS metallic projections defect that the utility model uses, copper metal silk is wound and is fixed on high-pressure conductive
On bar, part outstanding is to the abnormal protruding point on simulated high-pressure conductor, electricity in the experiment under all metallic projections defects
Extremely prominent length is 2cm.Grinding process is passed through in needle point end, and radius of curvature is about 0.3mm.
Every group of test discharge time is 96h, and power-frequency voltage is influenced by the variation of daily power load, will certainly cause defect
The fluctuation and then the generation of influence PD of model applied voltage and the size of discharge capacity, therefore discharge capacity is considered when monitoring PD
With the variation characteristic of period；Simultaneously as the limitation of data space and data processing time, it is both unnecessary that whole day monitors PD
Also unrealistic, therefore combine daily power load with the changing rule of period, it formulates PD signal monitoring scheme and is described as follows:
In terms of formally having been started by every group of test, battery of tests is averagely divided into 4 days, guarantees at least to acquire 2 PD daily
Data, each acquisition time are at least spaced 6 hours.In the acquisition of each PD signal, respectively acquire single pulse under and work
Each 100 groups of PD signal under the frequency period, and to the processing for statistical analysis of the signal of acquisition.
PD is relatively stable under metallic projections defect, in general, between the starting voltage and breakdown voltage of PD section across
It spends larger, PD intensity can be changed by adjusting outer test voltage of applying, to obtain the discharge capacity of different number grade.
After tested, the utility model PD firing potential in the case where placing metallic projections defect is 24kV, is chosen respectively
Test voltage is that 28.8kV, 33.6kV, 38.4kV, 43.2kV and 48kV are tested, and selects discharge capacity total amount QTOTAlCome anti-
PD strength of discharge is reflected, discharge capacity corresponding to each voltage is as shown in table 1 in experiment.
PD characteristic value under 1 metallic projections defect of table
| Experimental group | 28.8kV | 33.6kV | 38.4kV | 43.2kV | 48kV |
| QTOTAL/pC | 2342 | 3245 | 5988 | 13476 | 21236 |
Specific embodiment 2, insulator void defects.
Insulator void defects, abbreviation G (Gap) class defect.Not due to the thermal expansion coefficient of metal electrode and epoxy resin
Together, sometimes because removing forms small air gap between insulator and electrode, these air gaps can cause to distort to electric field, make air gap
The local high field intensity of middle generation, simultaneously because the disruptive field intensity of gas is less than solid insulator, so as to cause gas partial breakdown shape
At PD.The PD as caused by interior insulator defect will not cause SF6It decomposes, therefore project mainly studies insulator and height
Press the defect that air gap is formed between conductor.
The true type GIS insulator void defects that the utility model uses, exist between disc insulator and high-voltage conductive rod
With a thickness of the air gap of 0.5mm, 30 ° of radian.
Insulation defect model is placed in arc chamber, with vacuum pump and rubber tube short as far as possible is (when length will affect pumping
Between) cavity is vacuumized, and it is passed through SF6New gas repeated flushing cavity, with guarantee the intracorporal moisture gasification diffusion discharge chamber of chamber and
The indoor air of gas is sufficiently discharged.The high-purity SF of 0.4MPa is filled with after extracting vacuum again6Insulating gas is stablized a few hours, is made
SF6Uniformly, gas is in stable state, and determining device air-tightness is good for diffusion.Defect model is applied with gradually boosting method
Test voltage makes defect (i.e. applied voltage is less than inherent shortcoming firing potential) in the voltage threshold of permission generate stabilization
PD, otherwise need to adjust model parameter, re-start applied voltage test.
The PD signal of insulation defect model is monitored, by pulse current detection unit and digital storage oscilloscope to ensure absolutely
Edge defect generates effective, stable PD.Different electric discharge magnitudes can be obtained in adjustment voltage value, and (this project tests firing potential U0
For 15kV, using 1.2U0, 1.4U0And 1.6U0Three voltage class, i.e. 18kV, 21kV and 24kV are tested), it explores at 3
SF under different discharge capacity grades6Resolution characteristic, table 2 show total discharge capacity under 3 different experiments voltages.
PD characteristic value under 2 void defects of table
The acquisition of sample body and detection.In having carried out 96h PD test to insulation defect, every 12 hours with dedicated sampler bag
A discharge gas is acquired, single gas production is about 100mL.Using gas chromatograph, gas chromatography-mass spectrometry is moved in instrument and Fu
Leaf infrared survey instrument is measured in real time discharge gas, carries out qualitative and quantitative analysis to gas is decomposed.
Specific embodiment 3, insulator surface metal filth defect.
Insulator metallic pollution insulation defect, abbreviation M (Metal) class defect refer to inevitable remaining in GIS gas chamber
Metal particle is adsorbed on disc insulator by electrostatic force, is distorted disc insulator surface field, so as to cause
PD.The solid metal particle of insulator surface absorption, can chronically be fixed on insulator surface in some cases, act on similar
In metal protuberance object, but there is following different characteristic:
(1) some metal particles may be originally not dangerous on insulator, but the meeting under mechanical oscillation and electrostatic force
There is slight movement, and develops ultimately towards dangerous direction；
(2) metal particle of insulator surface will form surface charge aggregation, thus a possibility that increasing failure；
(3) particulate electric discharge will lead to insulator surface damage, generate surface trees off field in power frequency, and electric discharge is logical once being formed
Road can cause serious insulation fault.
The feature of the disc insulator surface metal contamination found when the utility model is for practical maintenance, and consider to test
Stability and regularity, using disc insulator surface radially paste certain size rectangle (5 × 10mm) aluminium foil simulate M
Class insulation defect, aluminium foil are 1cm at a distance from high-voltage conductive rod.
By pollution severity of insulators defect model be placed in arc chamber in, with vacuum pump and rubber tube short as far as possible (length general
Influence pumpdown time) cavity is vacuumized, and it is passed through SF6New gas repeated flushing cavity, to guarantee that the intracorporal moisture gasification of chamber is expanded
The gentle indoor air of the gas chamber that sheds sufficiently is discharged.The high-purity SF of 0.4MPa is filled with after extracting vacuum again6Insulating gas is stablized
A few hours make SF6Uniformly, gas is in stable state, and determining device air-tightness is good for diffusion.With gradually boosting method to defect
Model applies test voltage, makes defect (i.e. applied voltage is less than inherent shortcoming firing potential) in the voltage threshold of permission
Stable PD is generated, otherwise needs to adjust model parameter, re-starts applied voltage test.
PD monitoring.The PD letter of metal filth defect model is monitored by pulse current detection unit and digital storage oscilloscope
Number, to ensure that insulation defect generates effective, stable PD.Different electric discharge magnitudes can be obtained in adjustment voltage value, and (this project is tested
Beginning discharge voltage U0For 21.6kV, using 1.2U0, 1.5U0And 1.8U0Three voltage class, i.e., 25.9kV, 32.4kV and
38.9kV is tested), explore the SF under 3 different discharge capacity grades6Resolution characteristic, table 3 show 3 different experiments electricity
Total discharge capacity of pressure.
PD characteristic value under 3 pollution severity of insulators defect of table
| Experimental group | 25.9kV | 32.4kV | 38.9kV |
| QTOTAL/pC | 522 | 876 | 1894 |
The acquisition of sample body and detection.In having carried out 96h PD test to pollution severity of insulators defect, with dedicated sampling
The bag discharge gas of acquisition in every 12 hours, single gas production is about 100mL.Utilize gas chromatograph, gas chromatography-mass spectrometry
Dynamic instrument and Fourier's infrared survey instrument are measured in real time discharge gas, carry out qualitative and quantitative analysis to gas is decomposed.
Through the above technical solutions, the utility model have the advantage that it is as follows:
(1) PD intensity is to SF6The formation of decomposition product has facilitation, but has to the promotion rule of each decomposition components
Institute's difference.
(2) pollution severity of insulators defect PD simulated experiment shows: this kind of defect is to SF in electrical equipment6There is obvious shadow
It rings, especially will cause a large amount of SF in high PD discharge process6It decomposes, Ying Jinli is avoided.
(3) under pollution severity of insulators defect PD effect, the effective gas production rate and discharge capacity of each feature decomposition component are same
Sample, can be using effective gas production rate of each feature decomposition component as portraying fault severity level there is certain positive correlation
Characteristic quantity.When diagnosing to failure, qualitative or Quantitative evaluation is carried out to failure.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System, although the utility model is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or equivalent replacement, and practical new without departing from this
Any modification of type spirit and scope or equivalent replacement, should all cover the utility model claims it
It is interior.
Claims (5)
1. a kind of PD signal monitoring system, which is characterized in that the monitoring system includes:
Pressure regulator T, the pressure regulator T is connect with external communication voltage AC, for adjusting the output voltage of external communication voltage AC；
Separation filter, the separation filter is for being filtered output voltage of the external alternating voltage AC after overregulating
Processing, the separation filter are also connect with insulation defect discharging model；
Insulation defect discharging model, the PD pulsed current signal generated for analog insulation defect；The insulation defect electric discharge mould
Type also utilizes coupled capacitor CkThe PD pulsed current signal that insulation defect generates is coupled to noninductive detection impedance ZmOn, and pass through
Noninductive detection impedance ZmBy the PD pulsed current signal of generation be converted into corresponding pulse voltage signal be output in oscillograph show
Show.
2. PD signal monitoring system as described in claim 1, which is characterized in that also set inside the insulation defect discharging model
It is equipped with shelf depreciation prover；
The shelf depreciation prover is using the pulse current method in IEC60270 to the PD pulsed current signal in monitoring system
Amount is calibrated.
3. PD signal monitoring system as described in claim 1, which is characterized in that the separation filter includes first capacitor
C1, the second capacitor C2 and first resistor R1；
The first capacitor C1 is in parallel with first resistor R1 again after connecting with the second capacitor C2.
4. PD signal monitoring system as described in claim 1, which is characterized in that the monitoring system further includes having for real-time
Detect the dynamic instrument GC/MS of gas chromatography-mass spectrometry that SF6 decomposes gas；
The gas chromatography-mass spectrometry moves instrument GC/MS and connect with the insulation defect discharging model.
5. PD signal monitoring system as described in claim 1, which is characterized in that the insulation defect includes: insulation sublist
Face metal filth defect, insulator void defects and high-pressure conductor protrusion insulation defect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821554976.3U CN209102842U (en) | 2018-09-21 | 2018-09-21 | A kind of PD signal monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821554976.3U CN209102842U (en) | 2018-09-21 | 2018-09-21 | A kind of PD signal monitoring system |
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| Publication Number | Publication Date |
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