CN107390154A - System and method is verified in the sensitivity of partial discharge of transformer superfrequency detection means - Google Patents
System and method is verified in the sensitivity of partial discharge of transformer superfrequency detection means Download PDFInfo
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- CN107390154A CN107390154A CN201710618651.0A CN201710618651A CN107390154A CN 107390154 A CN107390154 A CN 107390154A CN 201710618651 A CN201710618651 A CN 201710618651A CN 107390154 A CN107390154 A CN 107390154A
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- detection means
- transformer
- partial discharge
- oil storage
- superfrequency detection
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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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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a kind of partial discharge of transformer superfrequency detection means sensitivity to verify system and method, the system includes pulse generating unit, oscillograph, without partial discharge voltage source, shelf depreciation measuring device, oil storage experiment casing and the artificial defect model being arranged on inside oil storage experiment casing and superfrequency detection means to be measured, described is connected without partial discharge voltage source with artificial defect model, and in parallel with shelf depreciation measuring device, described oscillograph is connected with superfrequency detection means to be measured.Compared with prior art, the present invention has the advantages that simple efficient.
Description
Technical field
It is special more particularly, to a kind of partial discharge of transformer the present invention relates to local discharge of electrical equipment detection technique field
High-frequency detection device sensitivity verifies system.
Background technology
Transformer is the important component in power system, and its reliability directly affects the safe operation of power network.Transformation
The reliability of device then depends mainly on its insulation status.One of the main reason for causing transformer insulated deterioration is shelf depreciation,
Therefore realize the detection of partial discharge of transformer has higher meaning to improving Power System Reliability.
Since phase at the beginning of the eighties in last century, for the partial-discharge ultrahigh-frequency of GIS and transformer (Ultra High
Frequency, abbreviation UHF) detection technique develops rapidly and positive effect progressively played in engineering, achieves substantial amounts of
Achievement.When shelf depreciation is occurring in the range of very little, dielectric breakdown process quickly, will produce very steep pulse electricity
Stream, its rise time is less than 1ns, and stimulating frequency is up to number GHz electromagnetic wave in equipment cavity.The base of UHF detection techniques
Present principles are exactly that extra-high frequency electromagnetic waves (300MHz~3GHz) signal caused by shelf depreciation is examined by type UHF sensor
Survey, so as to obtain the relevant information of shelf depreciation.UHF detection methods are compared with other shelf depreciation online measuring techniques, have inspection
Survey high sensitivity, live strong antijamming capability, shelf depreciation tuning on-line and excellent beneficial to insulation defect type identification etc. can be achieved
Point.
Because transformer-cabinet is to its inside shielding electromagnetic waves effect, typically uses pass through type UHF sensor both at home and abroad
Fuel outlet valve, ring flange and standardized media window put in inside transformer to carry out signal detection, are detection spirits the advantages of which
Sensitivity is high, strong antijamming capability.But this detection method, in actual use there are still deficiency, one of them is
It is difficult to determine whether the detection sensitivity of detection means meets to require.For under-sensitive detection means, possibly can not survey
The less shelf depreciation of discharge capacity in transformer is obtained, so as to influence the status monitoring effect to transformer.At present in engineering only
There is the verification method to GIS ultrahigh frequency detection means sensitivity, directly can not be used in transformer, to solve the problem, this
Invention provides a kind of partial discharge of transformer superfrequency detection means sensitivity checking System and method for.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of simple efficient change
System is verified in the sensitivity of depressor partial discharge ultrahigh frequency detection device.
The purpose of the present invention can be achieved through the following technical solutions：
System is verified in a kind of partial discharge of transformer superfrequency detection means sensitivity, and the system fills including pulse generation
Put, oscillograph, without partial discharge voltage source, shelf depreciation measuring device, oil storage experiment casing and be arranged on oil storage experiment casing
Internal artificial defect model and superfrequency detection means to be measured, the no partial discharge voltage source is connected with artificial defect model,
And in parallel with shelf depreciation measuring device, described oscillograph is connected with superfrequency detection means to be measured.
Described pulse generating unit includes adjustable impulse generator and the impulse ejection antenna being connected with each other, described
Impulse ejection antenna is extend into oil storage experiment casing.
Described oil storage experiment casing is a rectangular box body, and shell is lucite shell and does leakproof oil processing, its
Top side detachable simultaneously offers to set the through hole of impulse ejection antenna and superfrequency detection means to be measured.
Described impulse ejection antenna is unipole antenna, using N-type coaxial connector as feed output end, described N
The inner wire of type coaxial connector is connected with unipole antenna, outer conductor and the metal chassis phase being arranged at the top of oil storage experiment casing
Even, described metal chassis is flange arrangement, and is provided with seal groove, and seal groove is built with rubber seal.
A kind of verification method, comprises the following steps：
1) artificial defect model is put into oil storage examination with shelf depreciation measuring device is connected and connected without partial discharge voltage source
In tryoff body, while superfrequency detection means to be measured is connected with oscillograph, be put into oil storage experiment casing, in artificial defect mould
Apply voltage in type, until the discharge capacity on shelf depreciation measuring device reaches the maximum of transformer permission discharge capacity, note
Record the peak-to-peak value of now signal on oscillograph；
2) artificial defect model is taken out, replaces with impulse ejection antenna, its input and adjustable impulse generator phase
Even, the amplitude of regulation impulse generator output pulse, until the peak peak of the peak-to-peak value of signal and record in step 1) on oscillograph
Be worth it is identical, obtain now can adjust impulse generator parameter；
3) use and identical impulse ejection antenna, adjustable impulse generator and connection cables in step 2), and keep
Adjustable impulse generator arrange parameter is consistent, by impulse ejection antenna installation at the scene on transformer for install sensor
On position, if the signal injected every time can be detected that is, signal to noise ratio reaches 2 by other sensors：1, then judge the transformation
Device partial discharge ultrahigh frequency detection device meets sensitivity requirement, if it is not, then judging that the partial discharge of transformer superfrequency detects
Device is unsatisfactory for sensitivity requirement.
In described step 3), if being only equipped with a sensor in live transformer, impulse ejection antenna is arranged on
The diagonal position of the sensor, and observe whether the sensor can detect ultrahigh-frequency signal.
Compared with prior art, the present invention has advantages below：
The invention provides a kind of scheme that detection sensitivity checking is carried out to superfrequency detection means, the program are simply high
Effect, can verify that the validity and reliability of the superfrequency detection means in transformer, so as to improve transformer station high-voltage side bus
Stability.
Brief description of the drawings
Fig. 1 is that system and application method schematic diagram are verified in the sensitivity of partial discharge of transformer superfrequency detection means, in figure
The occupation mode of system is verified when top is step 1, the occupation mode of checking system when lower section be step 2 in figure.
Wherein, 1, oil storage experiment casing, 2, artificial defect model, 3, without partial discharge voltage source, 4, shelf depreciation measurement dress
Put, 5, impulse ejection antenna, 6, adjustable impulse generator, 7, oscillograph, 8, superfrequency detection means to be measured.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in figure 1, this partial discharge of transformer superfrequency detection means sensitivity checking system includes oil storage chamber
Body 1, artificial defect model 2, without partial discharge voltage source 3, shelf depreciation measuring device 4, impulse ejection antenna 5, adjustable pulse
Generator 6, oscillograph 7 and superfrequency detection means 8 to be measured.
Transformer oil is full of in oil storage experiment casing 1, for the inside electromagnetic wave signal in experiment lab simulation transformer
Propagation path.Oil storage experiment casing is in cuboid, and in the present embodiment, the size used is long 1000mm, wide 500mm, high
800mm.Shell is made using lucite and carries out oil-leakage-prevention processing, and top can be unloaded, and is provided with two through holes.
Artificial defect model 2 is placed in oil storage examination with being connected and connecting shelf depreciation measuring device 4 without partial discharge voltage source 3
In tryoff body 1, for simulating actual local discharge signal, in the present embodiment, using free metal granular model.Without partial discharge electricity
The connection cables of potential source 3 are drawn from the through hole at the top of oil storage experiment casing 1.
Superfrequency detection means 8 to be measured is placed in oil storage experiment casing 1 via another through hole, signal output to oscillograph
In 7, Tyke DPO70604B can be selected in oscillograph 7, has 4 passages, 6GHz bandwidth, 25G sample rates.In use, in artificial defect
Apply voltage on model 2, until the discharge capacity on shelf depreciation measuring device 4 reaches the maximum of transformer permission discharge capacity
Value.In the present embodiment, it is allowed to which the maximum of discharge capacity uses DL/T417-2006《Power equipment shelf depreciation in-site measurement is led
Then》Middle 110kV and above transformer existThe discharge capacity 500pC allowed in commissioning test.Now on oscillograph
Signal is the ultrahigh-frequency signal that the superfrequency detection means 8 measures in the case of without hindrance, records its peak-to-peak value.
Due to being difficult with the scene in transformer using artificial defect model 2 simulation local discharge signal, and wiring is answered
It is miscellaneous, therefore carried out using impulse ejection antenna 5 with adjustable impulse generator 6 equivalent.Impulse ejection antenna 5 is unipole antenna, is made
It is connected by the use of N-type coaxial connector as feed output end, connector inner wire with antenna, outer conductor is connected with metal chassis, bottom
Disk is flange arrangement, and is provided with seal groove, and groove is built with rubber seal.In the present embodiment, the defeated of impulse generator 6 can adjust
It is that can adjust positive and negative 150V to go out voltage, and output impedance 50, the rise time is unadjustable and is less than 70ps.By impulse ejection antenna 5
It is connected with adjustable impulse generator 6 and replaces artificial defect model 2, be placed in oil storage experiment casing, adjusts impulse generator
The voltage magnitude of pulse 6 is exported, it is identical when the peak-to-peak value of signal is with user's work insulation defect 2 before on oscillograph 7.This
When the impulse ejection antenna 5, adjustable impulse generator 6 together with its connection cables and 500pC when partial discharge model caused by
Ultrahigh-frequency signal is equivalent.
In view of the decay to ultrahigh-frequency signal such as transformer oil, iron core, winding and shell in live transformer and catadioptric
Penetrate, when carrying out detection sensitivity checking, should try one's best makes the distance between sensor and impulse ejection antenna 5 big, and barrier is more,
So as to reach the maximum conditions of detection.For the detection means of multisensor, the installation between sensor, which already allows for, to the greatest extent may be used
The impulse ejection antenna 5 need to be only arranged on the position of a certain sensor when can cover transformer, therefore verify, observe other biographies
Whether sensor detects the ultrahigh-frequency signal sent by can adjust impulse generator 6, i.e. signal to noise ratio reaches 2：1.Feel for patrilineal line of descent with only one son in each generation
The detection means of device, then impulse ejection antenna 5 can be arranged on to the diagonal position of the sensor, observe whether the sensor can be examined
Measure ultrahigh-frequency signal.
Based on above-mentioned analysis, the present invention also provides a kind of partial discharge of transformer superfrequency detection means sensitivity authentication
Method, using above-mentioned checking system, comprise the following steps：
Step 1：By artificial defect model 2 with shelf depreciation measuring device 4 is connected and connected without partial discharge voltage source 3, put
Enter in oil storage experiment casing 1, while superfrequency detection means 8 to be measured be connected with oscillograph 7, be put into oil storage experiment casing 1,
Apply voltage on artificial defect model 2, allow to discharge until the discharge capacity on shelf depreciation measuring device 4 reaches transformer
The maximum of amount, record the peak-to-peak value of now signal on oscillograph 7.
Step 2：Artificial defect model 2 is taken out, is substituted for impulse ejection antenna 5, its input is sent out with adjustable pulse
Raw device 6 is connected, and regulation impulse generator 6 exports the amplitude of pulse, until in the peak-to-peak value and step 1 of signal on oscillograph 7
It is identical, record the parameter that now can adjust impulse generator 6.
Step 3：Using with identical impulse ejection antenna 5 in step 2, adjustable impulse generator 6 and connection cables,
And keep the adjustable arrange parameter of impulse generator 6 consistent, the impulse ejection antenna 5 is installed at the scene on transformer for installation
On the position of sensor, if the signal injected every time can be detected that is, signal to noise ratio reaches 2 by other sensors：1, then
Show that the partial discharge of transformer superfrequency detection means 8 can meet sensitivity requirement；If one is only provided with transformer
Sensor, then impulse ejection antenna can be arranged on to the diagonal position of the sensor, and observe whether the sensor can detect
Ultrahigh-frequency signal.
Claims (6)
1. system is verified in a kind of partial discharge of transformer superfrequency detection means sensitivity, it is characterised in that the system includes arteries and veins
Rush generating means, oscillograph (7), without partial discharge voltage source (3), shelf depreciation measuring device (4), oil storage experiment casing (1) with
And it is arranged on the internal artificial defect model (2) of oil storage experiment casing (1) and superfrequency detection means to be measured (8), described nothing
Partial discharge voltage source (3) is connected with artificial defect model (2), and the oscillography in parallel, described with shelf depreciation measuring device (4)
Device (7) is connected with superfrequency detection means (8) to be measured.
2. a kind of partial discharge of transformer superfrequency detection means sensitivity checking system according to claim 1, it is special
Sign is that described pulse generating unit includes the adjustable impulse generator (6) and impulse ejection antenna (5) being connected with each other,
Described impulse ejection antenna (5) is extend into oil storage experiment casing (1).
3. a kind of partial discharge of transformer superfrequency detection means sensitivity checking system according to claim 1, it is special
Sign is that described oil storage experiment casing (1) is a rectangular box body, and shell is lucite shell and does leakproof oil processing,
Its top side detachable simultaneously offers to set the through hole of impulse ejection antenna (5) and superfrequency detection means to be measured (8).
4. a kind of partial discharge of transformer superfrequency detection means sensitivity checking system according to claim 2, it is special
Sign is that described impulse ejection antenna (5) is unipole antenna, described using N-type coaxial connector as feed output end
The inner wire of N-type coaxial connector is connected with unipole antenna, outer conductor and the metal bottom being arranged at the top of oil storage experiment casing (1)
Disk is connected, and described metal chassis is flange arrangement, and is provided with seal groove, and seal groove is built with rubber seal.
5. a kind of partial discharge of transformer superfrequency detection means sensitivity checking system applied as described in claim 1-4
Verification method, it is characterised in that comprise the following steps：
1) artificial defect model is put into oil storage chamber with shelf depreciation measuring device is connected and connected without partial discharge voltage source
In vivo, while by superfrequency detection means to be measured it is connected, is put into oil storage experiment casing, on artificial defect model with oscillograph
Apply voltage, until the discharge capacity on shelf depreciation measuring device reach transformer allow discharge capacity maximum, record this
When oscillograph on signal peak-to-peak value；
2) artificial defect model is taken out, replaces with impulse ejection antenna, its input is connected with adjustable impulse generator, adjusts
The amplitude of impulse generator output pulse is saved, until the peak-to-peak value phase of the peak-to-peak value of signal and record in step 1) on oscillograph
Together, the parameter that now can adjust impulse generator is obtained；
3) use and identical impulse ejection antenna, adjustable impulse generator and connection cables in step 2), and keep adjustable
Section impulse generator arrange parameter is consistent, and impulse ejection antenna installation is supplied to the position of install sensor on transformer at the scene
On, if the signal injected every time can be detected that is, signal to noise ratio reaches 2 by other sensors：1, then judge the transformer partial
Portion's electric discharge superfrequency detection means meets sensitivity requirement, if it is not, then judging the partial discharge of transformer superfrequency detection means
It is unsatisfactory for sensitivity requirement.
6. a kind of verification method according to claim 5, it is characterised in that in described step 3), if live transformer
In a sensor only be housed, then the diagonal position by impulse ejection antenna installed in the sensor, and observe the sensor and be
It is no to detect ultrahigh-frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710618651.0A CN107390154A (en) | 2017-07-26 | 2017-07-26 | System and method is verified in the sensitivity of partial discharge of transformer superfrequency detection means |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710618651.0A CN107390154A (en) | 2017-07-26 | 2017-07-26 | System and method is verified in the sensitivity of partial discharge of transformer superfrequency detection means |
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| CN107390154A true CN107390154A (en) | 2017-11-24 |
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| CN201710618651.0A Pending CN107390154A (en) | 2017-07-26 | 2017-07-26 | System and method is verified in the sensitivity of partial discharge of transformer superfrequency detection means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702779A (en) * | 2021-08-23 | 2021-11-26 | 国网山东省电力公司电力科学研究院 | Local discharge ultrahigh frequency sensor field calibration method for transformer |
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| CN113702779A (en) * | 2021-08-23 | 2021-11-26 | 国网山东省电力公司电力科学研究院 | Local discharge ultrahigh frequency sensor field calibration method for transformer |
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Application publication date: 20171124 |