CN108051716A - A kind of detection method for local discharge based on frequency dividing sampling - Google Patents
A kind of detection method for local discharge based on frequency dividing sampling Download PDFInfo
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- CN108051716A CN108051716A CN201810102065.5A CN201810102065A CN108051716A CN 108051716 A CN108051716 A CN 108051716A CN 201810102065 A CN201810102065 A CN 201810102065A CN 108051716 A CN108051716 A CN 108051716A
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- oscillograph
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- partial discharge
- detection method
- voltage drop
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
Abstract
This application involves Partial Discharge Detecting Technology fields, and in particular to a kind of detection method for local discharge based on frequency dividing sampling.It the described method comprises the following steps：Gather the voltage drop at Partial Discharge Detection impedance both ends；By the input terminal of voltage drop input oscillograph；The sample rate and trigger condition of the oscillograph are set；The oscillograph output terminal shows partial discharge pulse's signal.By the sample rate and trigger condition that set oscillograph so that the input terminal of oscillograph only gathers accidental partial discharge pulse's signal, convenient for carrying out Macro or mass analysis to accidental local pulse characteristic；In addition, by the sample rate and trigger condition that set oscillograph, pulse signal need not be acquired always by ensuring the input terminal of oscillograph, only just be triggered acquisition when there is accidental pulse generation, so gathered in real time always without using the larger industrial personal computer of memory, an oscillograph is only needed it is achieved that saving the memory space of collecting device.
Description
Technical field
This application involves Partial Discharge Detecting Technology fields, and in particular to a kind of Partial Discharge Detection based on frequency dividing sampling
Method.
Background technology
Shelf depreciation (Partial Discharge, abbreviation PD) detection is considered as that GIS operational reliabilitys monitoring means is worked as
In mostly important and effective Condition assessment of insulation method, before GIS insulating parts dispatch from the factory and the diagnosis of GIS state of insulations and comment
A lot of research and application has been obtained in estimating.GIS may suffer from external force, overload, temperature in operation year in year out
It spends high factor and damages apparatus insulated performance, the shelf depreciation category common phenomenon of power grid electric utility, shelf depreciation is GIS exhausted
The omen of edge deterioration, if without finding, handling in time, electrical damage caused by electric discharge upgrades, and eventually results in insulation breakdown,
Cause power grid accident, in some instances it may even be possible to heavy economic losses can be brought.
At present, most popular detection method for local discharge is pulse current method and ultrasonic Detection Method.Pulse current
In method frequently be Rogowsky coil type current sensor, measurement shelf depreciation radio frequency band (3-30MHz) signal,
And national standard《GB/T7354-2003 measurement of partial discharges》The method of middle recommendation.It is respectively routinely office shown in Fig. 1, Fig. 2
Portion's discharge pulse and sporadic pulse, as figure shows, conventional partial discharge pulse belong to stable discharge pulse, phase of discharging
Position and amplitude variation are little, are easier identified and gather.And accidental partial discharge pulse has very big randomness, puts
Electric amplitude is often higher, and generation phase of discharging is not fixed.
In GIS, occurrent partial discharge pulse often leads to gas-solid interface and edge flashing occurs, and causes destructive event
Barrier.And the type approval test before dispatching from the factory currently for GIS, just for the partial discharge quantity in pressure-resistant 5 minutes whether be more than
Certain amplitude is differentiated, is often ignored for accidental individual pulse.It is in addition, real for the GIS in operational process
Row partial discharge monitoring often focuses more in the partial discharge pulse's signal frequently sent in short-term, has ignored accidental arteries and veins
Rush the influence brought.
The content of the invention
In order to solve that accidental local pulse signal can not be acquired present in existing detection method for local discharge
The problem of analysis, this application provides a kind of partial discharge pulse's signal detecting methods based on frequency dividing sampling.
A kind of partial discharge pulse's signal detecting method based on frequency dividing sampling, specifically includes following steps：
Gather the voltage drop at Partial Discharge Detection impedance both ends；
By the input terminal of voltage drop input oscillograph；
The sample rate and trigger condition of the oscillograph are set；
The oscillograph output terminal shows partial discharge pulse's signal.
Further, the sample rate of the oscillograph is 50MS/s~500MS/s；The trigger condition of the oscillograph is arteries and veins
Rush rising edge triggering.
Further, the triggering level of the oscillograph and the Partial Discharge Detection impedance and amplifiers；
Further, the triggering level of the oscillograph is arranged to 5~8 times of background scene noise amplitude.
Further, the voltage drop at the acquisition Partial Discharge Detection impedance both ends, including：By coaxial cable to part
The voltage drop at discharge examination impedance both ends is acquired.
Further, the coaxial cable is BNC coaxial cables.
Further, the detection impedance is resistance.
The technical solution that the application provides includes following advantageous effect：By setting the sample rate of oscillograph and triggering item
Part so that the input terminal of oscillograph only gathers accidental partial discharge pulse's signal, and other kinds of pulse signal oscillograph is then not
Acquisition, convenient for carrying out Macro or mass analysis to accidental local pulse characteristic；In addition, by setting the sample rate of oscillograph and triggering item
Part, it is ensured that the input terminal of oscillograph need not be acquired pulse signal always, just be touched only when there is accidental pulse generation
Hair acquisition, so gathers in real time always without using the larger industrial personal computer of memory, it is only necessary to which an oscillograph is it is achieved that section
The memory space of collecting device is saved；Finally, by the detection method for local discharge, accidental local pulse is stored simultaneously
Identification assists in generation and development trend that people study accidental pulse signal, people is helped to find GIS device failure hair
Raw inducement.
Description of the drawings
Attached drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the application
Example, and for explaining the principle of the application together with specification.
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is routinely partial discharge pulse's signal schematic representation in the prior art；
Fig. 2 is accidental partial discharge pulse's signal schematic representation in the prior art；
Fig. 3 is the parallel impedance measuring circuit figure of the application prior art pulse current method measurement of partial discharge；
Fig. 4 is the flow diagram for the detection method for local discharge based on frequency dividing sampling that the application provides.
Reference sign：1st, GIS device.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application；On the contrary, they are only and appended power
The example of the consistent device of some aspects be described in detail in sharp claim, the application.
For the technological means and effect that the application reaches predetermined purpose and taken is expanded on further, below in conjunction with attached drawing and reality
Specific embodiment, structure feature and its effect of the example to the application are applied, detailed description are as follows.
Embodiment 1：
With reference to parallel impedance measuring circuit figure shown in Fig. 3, wherein, 1 is GIS device, and U is high-voltage test electric power, CcFor
Coupled capacitor, R are isolation resistance, Z for Partial Discharge Detection impedance and with coupled capacitor CcSeries connection, as insulation defect CdGeneration office
When portion discharges, pulse voltage is generated by the pulse current of PD of Z and is dropped, carries out local discharge signal sensing.In figure 3,
As insulation defect CdDuring generation shelf depreciation, there are two circuits for the pulse current of shelf depreciation：Circuit 1 is Cd-Cp-Cs, the circuit
Without detection impedance Z；Circuit 2 is Cd-Cc-Z-Cs, which generates voltage drop by detection impedance Z on Z.
The detection method for local discharge that the application provides, by a BNC coaxial cable, passes the voltage drop on Z
Sense is connected to the oscillograph input of collection terminal, you can obtain partial discharge pulse's signal.The oscillograph sampling configuration of collection terminal is set
Frequency dividing sampling configuration is set to, sample rate and trigger condition is adjusted, is arranged to just for the shelf depreciation for possessing accidental pulse attribute
Pulse is sampled, and other kinds of impulse oscilloscope stops acquisition.In this way, it is accidental to insulate to running GIS device
Shelf depreciation is acquired, and for other kinds of pulse and ambient noise without acquisition.
It is shown in Figure 4, show for a kind of flow based on the detection method for local discharge for dividing sampling that the application provides
It is intended to, specifically comprises the following steps：
S101, the voltage drop at acquisition Partial Discharge Detection impedance both ends；
S102, the input terminal by voltage drop input oscillograph；
S103, the sample rate and trigger condition that the oscillograph is set；
S104, the oscillograph output terminal show partial discharge pulse's signal.
The detection method for local discharge that the application provides, by the sample rate and trigger condition that set oscillograph so that show
The input terminal of ripple device only gathers accidental partial discharge pulse's signal, and other kinds of pulse signal oscillograph is not gathered then, is convenient for
Macro or mass analysis is carried out to accidental local pulse characteristic；In addition, sample rate and trigger condition by setting oscillograph, it is ensured that oscillography
The input terminal of device need not be acquired pulse signal always, and be only just triggered acquisition when there is accidental pulse generation, so
It is gathered in real time always without using the larger industrial personal computer of memory, it is only necessary to which an oscillograph is set it is achieved that saving acquisition
Standby memory space；Finally, by the detection method for local discharge, accidental local pulse is stored and identified, is helped
In generation and development trend that people is helped to study accidental pulse signal, people is helped to find the inducement that GIS device failure occurs.
Embodiment 2：
It is shown in Figure 4, show for a kind of flow based on the detection method for local discharge for dividing sampling that the application provides
It is intended to, specifically comprises the following steps：
S101, the voltage drop at acquisition Partial Discharge Detection impedance both ends；
S102, the input terminal by voltage drop input oscillograph；
S103, the sample rate and trigger condition that the oscillograph is set；
S104, the oscillograph output terminal show partial discharge pulse's signal.
Optionally, the sample rate of the oscillograph is 50MS/s to 500MS/s, and the trigger condition of the oscillograph is pulse
Rising edge triggers.
Optionally, the triggering level of the oscillograph is needed with detection impedance and amplifiers.
Optionally, the triggering level of the oscillograph is arranged to 5~8 times of background scene noise amplitude, the scene back of the body
Scape noise amplitude is related to site environment factor, different site environments, and ambient noise amplitude is different.
Optionally, the voltage drop at the acquisition Partial Discharge Detection impedance both ends is that shelf depreciation is examined by coaxial cable
The voltage drop for surveying impedance both ends collects.
Optionally, the coaxial cable is BNC coaxial cables.
Optionally, the detection impedance is resistance.
Specifically, it is assumed that the storage depth that oscillograph has is 1G point, and sample rate is arranged to 100MS/s, for scene
After accidental pulse characteristic is configured, each accidental impulse sampling points facility is 200 points.Since measurement, traditional survey
Amount method can only gather 1G point, that is, can gather the signal in 512 power frequency periods, however, real shelf depreciation
Signal might not be present in this 512 cycles；And employ the frequency dividing method of sampling and sampled, then it can collect at least
5000 accidental pulses, corresponding sampling time, you can inverse goes out the pulse corresponding power frequency time and phase, collecting efficiency can be big
It is big to improve.
It should be noted that term " comprising " is intended to non-exclusive inclusion, in the absence of more restrictions,
The element limited by sentence " including ... ", it is not excluded that in the process, method, article or apparatus that includes the element also
There are other identical elements.
Those skilled in the art will readily occur to the application's after considering this specification and putting into practice the invention applied here
Other embodiments.This application is intended to cover any variations, uses, or adaptations of the present invention, these modifications, purposes
Or adaptive change follows the general principle of the present invention and including untapped in the art known normal of the present invention
Knowledge or conventional techniques.
It should be appreciated that the precision architecture that the application is not limited to be described above and be shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by appended claim.
Claims (7)
1. a kind of detection method for local discharge based on frequency dividing sampling, which is characterized in that specifically include following steps：
Gather the voltage drop at Partial Discharge Detection impedance both ends；
By the input terminal of voltage drop input oscillograph；
The sample rate and trigger condition of the oscillograph are set；
The oscillograph output terminal shows partial discharge pulse's signal.
2. detection method for local discharge according to claim 1, which is characterized in that the sample rate of the oscillograph is
50MS/s~500MS/s；The trigger condition of the oscillograph triggers for rising edge of a pulse.
3. detection method for local discharge according to claim 2, which is characterized in that the triggering level of the oscillograph and institute
State Partial Discharge Detection impedance and amplifiers.
4. detection method for local discharge according to claim 2, which is characterized in that the triggering level of the oscillograph is set
For 5~8 times of background scene noise amplitude.
5. detection method for local discharge according to claim 1, which is characterized in that the acquisition Partial Discharge Detection impedance
The voltage drop at both ends, including：The voltage drop at Partial Discharge Detection impedance both ends is acquired by coaxial cable.
6. detection method for local discharge according to claim 5, which is characterized in that the coaxial cable is BNC coaxial electricals
Cable.
7. according to claim 1-6 any one of them detection method for local discharge, which is characterized in that the detection impedance is electricity
Resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810102065.5A CN108051716A (en) | 2018-02-01 | 2018-02-01 | A kind of detection method for local discharge based on frequency dividing sampling |
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| CN201810102065.5A CN108051716A (en) | 2018-02-01 | 2018-02-01 | A kind of detection method for local discharge based on frequency dividing sampling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777376A (en) * | 2021-09-27 | 2021-12-10 | 广东工业大学 | Oscilloscope triggering system and oscilloscope triggering method |
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| CN113777376B (en) * | 2021-09-27 | 2024-03-22 | 广东工业大学 | Triggering system and triggering method of oscilloscope |
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Application publication date: 20180518 |