CN207020276U - A kind of converter power transformer discharge characteristic experimental rig - Google Patents
A kind of converter power transformer discharge characteristic experimental rig Download PDFInfo
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- CN207020276U CN207020276U CN201720850775.7U CN201720850775U CN207020276U CN 207020276 U CN207020276 U CN 207020276U CN 201720850775 U CN201720850775 U CN 201720850775U CN 207020276 U CN207020276 U CN 207020276U
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Abstract
The utility model discloses a kind of converter power transformer discharge characteristic experimental rig,The device can carry out the discharge characteristic experiment under converter power transformer different faults pattern,Simultaneously,By being connected to the first discharge instrument in transformer oil of the DC bushing with the end shield for exchanging sleeve pipe and in casing,Second discharge instrument and the 3rd discharge instrument,Converter power transformer (discharging model) discharge characteristic under alternating current-direct current composite voltage can be extracted,Chromatography in oil is overcome can not accurately to provide deficiency existing for the internal specific electric discharge type of change of current change,Also the feature under different discharge characteristics can be provided,Overcome the shortcomings of that AC transformer discharge characteristic can not become internal discharge fault diagnosis using the lower change of current of alternating current-direct current composite voltage effect completely,Safe and stable operation to effectively lifting its discharge fault diagnostic accuracy of converter power transformer and to electric device has great significance,There is important technical support to power supply guarantee,Great economic benefit can be brought simultaneously.
Description
Technical field
It the utility model is related to converter power transformer fault diagnosis technology field, and in particular to a kind of converter power transformer electric discharge is special
Levy experimental rig.
Background technology
With the rapid development of Chinese society's economy and the continuous progress of science and technology, entire society is increasing to the demand of electric energy,
Therefore power network scale constantly expands.But serious asymmetric problem be present in Chinese energy distribution and economic development, east and
The economically developed energy in south is few, and Western Energy Resources are abundant but economy relatively falls behind, thus Western Energy Resources are effectively transported to east and
South, contribute to the sustainable development of national economy.High-voltage direct-current technology of transmission of electricity because its remote Large Copacity conveying in it is excellent
Gesture is obvious, has in the big ground of China and hands over super extra-high voltage direct-current transmission device to put into operation more.
Converter power transformer is that a most important power equipment, main function are to provide spy in high-voltage direct-current technology of transmission of electricity
The power supply very required, its major parameter are determined by the particular/special requirement and the ac equipment parameter that is coupled of flow directing device.
Converting plant, ac equipment and flow directing device are isolated with converter power transformer, changed the electric energy for exchanging networking by current converter
For HVDC electric energy, HVDC transmission line is sent to；In Inverter Station, direct current energy is converted to by exchange by current converter
Electric energy, then normal communication sinusoidal voltage is converted to by converter power transformer, it is sent to AC network；So as to realize ac transmission networking
With the contact of HVDC transmission line.Therefore, change of current varying magnetic field analysis plays in rheological Design, operation and accident analysis is changed
Important effect.Take place frequently internal discharge failure inside converter power transformer in recent years, although chromatography can be effective in transformer oil
It was found that internal overheat or discharge fault, but be only capable of providing the internal possible abort situation of change of current change, internal tool can not be provided
The electric discharge type of body.Conventional AC transformer has done substantial amounts of research in terms of discharge measuring, but alternating current-direct current is born in change of current change
Composite voltage, discharge characteristic are in complete different characteristic with alternating voltage, and the feature of its fault diagnosis can not be entirely applied to
The discharge fault diagnosis that DC converter becomes.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, there is provided one kind is easy to be diagnosed to be change of current transformation
The converter power transformer discharge characteristic experimental rig of device abort situation and type.
To achieve the above object, the technical solution of the utility model is：
A kind of converter power transformer discharge characteristic experimental rig, including
Casing, its inside are full of transformer oil, DC bushing are separately installed with the two sides of casing and exchanges sleeve pipe；
Transformer oil oil inlet and oil-out are respectively arranged with casing, is connected between oil inlet and oil-out by oil pipe；
Discharging model, it is arranged in casing；The direct current of discharging model is extreme and DC bushing is electrically connected, alternating current
It is extreme and exchange sleeve pipe and be electrically connected, to bear alternating current-direct current composite voltage, simulate change of current change transformer normally with failure
Operating mode；
DC voltage generator, it is electrically connected by lead and DC bushing, for producing DC voltage and being applied to
The direct current of discharging model is extreme, realizes that the change of current becomes the simulation of transformer dc operating mode；
Ac voltage withstanding equipment, it is electrically connected by lead with sleeve pipe is exchanged, and is put for producing alternating voltage and being applied to
The alternating current of electric model is extreme, realizes that the change of current becomes the simulation of transformer alternating operating mode；
Oil circulating pump, it is installed in oil pipe, to realize that transformer oil circulates in casing and oil pipe；
Heater box, it is installed in oil pipe, to heat the transformer oil in oil pipe.
The discharging model is replaceable model, including the change of current becomes body insulating part internal air gap discharging model, is used for
Analog insulation paper is in technology controlling and process during the manufacturing bad the defects of causing；The change of current becomes suspended conductor discharging model, is used for
Current potential connecting line loose contact is simulated, is suspended in caused electric discharge problem in converter power transformer；And the change of current becomes body insulating part
Internal discharge model, the problem of for analog insulation paper internal discharge.
The change of current, which becomes body insulating part internal air gap discharging model, includes DC electrode, ac electrode and internal setting
There are cavity and the insulating paper being in contact with DC electrode and ac electrode；Wherein, the DC electrode is mutually electrically connected with DC bushing
Connect, to apply DC voltage to insulating paper；Ac electrode is electrically connected with sleeve pipe is exchanged, to apply alternating voltage to insulating paper.
The change of current, which becomes suspended conductor discharging model, includes DC electrode, becket, insulating paper and ac electrode；Its
In, the becket is positioned on the upper surface of insulating paper, gap between DC electrode and becket be present, DC electrode and straight
Stream sleeve pipe is electrically connected, to apply DC voltage to insulating paper；The lower surface of ac electrode and insulating paper is in contact, ac electrode
It is electrically connected with sleeve pipe is exchanged, to apply alternating voltage to insulating paper.
The change of current become body insulating part internal discharge model include DC electrode, ac electrode and with DC electrode and
The insulating paper that ac electrode is in contact；Wherein, that one end that the DC electrode and insulating paper are in contact is aciculiform shape, direct current
Pole and DC bushing are electrically connected, to apply DC voltage to insulating paper；Ac electrode is electrically connected with sleeve pipe is exchanged, with to exhausted
Edge paper applies alternating voltage.
Oily speed meter is also equipped with the oil pipe, for measuring the flow velocity that transformer oil circulates in oil pipe.
Be additionally provided with the oil pipe and take hydraulic fluid port, for realize in oil pipe transformer oil release, control transformer oil with
Extraneous interaction.
The DC voltage generator, ac voltage withstanding equipment, casing and oil pipe are all connected with the earth, keep zero potential.
Insulation branch is installed in the bottom of the casing, for the total weight of supporting box, and keeps casing and the earth
Between insulating properties.
Compared with prior art, its advantage is the utility model：
Converter power transformer discharge characteristic experimental rig of the present utility model can carry out converter power transformer different faults pattern
Under discharge characteristic experiment, meanwhile, by transformer oil of the DC bushing with the end shield for exchanging sleeve pipe and in casing distinguish
It is connected with the first discharge instrument, the second discharge instrument and the 3rd discharge instrument, you can handing over to extract converter power transformer (discharging model)
Discharge characteristic under direct current composite voltage, chromatography in oil is overcome can not accurately to provide existing for the internal specific electric discharge type of change of current change
Deficiency, the feature under different discharge characteristics can be also provided, overcomes AC transformer discharge characteristic to be answered completely using alternating current-direct current
The deficiency that the lower change of current of voltage effect becomes internal discharge fault diagnosis is closed, to effectively its discharge fault of lifting converter power transformer diagnosis essence
Spend and the safe and stable operation of electric device is had great significance, there is important technology branch to power supply guarantee
Hold, while great economic benefit can be brought.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model converter power transformer discharge characteristic experimental rig；
Structural representation when Fig. 2 is the actual measurement application of the utility model converter power transformer discharge characteristic experimental rig
Figure；
Fig. 3 is the structural representation that the change of current becomes body insulating part internal air gap discharging model；
Fig. 4 is the structural representation that the change of current becomes suspended conductor discharging model；
Fig. 5 is the structural representation that the change of current becomes body insulating part internal discharge model；
Fig. 6 is the structural representation of the first discharge instrument and the second discharge instrument；
Fig. 7 is the structural representation of the 3rd discharge instrument；
In figure：1st, the first discharge instrument；2nd, the second discharge instrument；3rd, the 3rd discharge instrument；4th, casing；5th, transformer oil；6th, direct current set
Pipe；7th, sleeve pipe is exchanged；8th, DC voltage generator；9th, ac voltage withstanding equipment；10th, discharging model；11st, oil pipe；12nd, oil circulation
Pump；13rd, oil speed meter；14th, hydraulic fluid port is taken；15th, insulation column；16th, heater box；20th, DC electrode；30th, ac electrode；40th, insulate
Paper；41st, cavity；50th, becket.
Embodiment
Content of the present utility model is described in further details with reference to the accompanying drawings and detailed description.
Embodiment
As shown in fig.1, the structural representation of the converter power transformer discharge characteristic experimental rig provided for the present embodiment, should
Converter power transformer discharge characteristic experimental rig includes casing 4, and the inside of casing 4 is full of transformer oil 5, in the two sides of casing 4
It is separately installed with DC bushing 6 and exchanges sleeve pipe 7, wherein, the DC bushing 6 is mutually electric with DC voltage generator 8 by lead
Connection, exchange sleeve pipe 7 are electrically connected by lead and ac voltage withstanding equipment 9, meanwhile, discharging model 10 is placed with casing 4,
The direct current of the discharging model 10 is extremely electrically connected with DC bushing 6, alternating current extremely with exchange sleeve pipe 7 and be electrically connected, such as
This, when DC voltage generator 8 works, the direct current that its caused high direct voltage can then be applied to discharging model 10 is extreme,
Realize that the change of current becomes the simulation of transformer dc operating mode, when ac voltage withstanding equipment 9 works, its caused AC-AC voltage then can
It is applied to that the alternating current of discharging model 10 is extreme, realizes that the change of current becomes the simulation of transformer alternating operating mode, that is to say, that the electric discharge mould
Type 10 will bear alternating current-direct current composite voltage, and simulate the change of current become transformer normally with the operating mode under failure；In addition, above-mentioned is straight
Stream sleeve pipe 6 with exchange sleeve pipe 7 and casing 4 all keeps insulation safety, add DC voltage to prevent from applying discharging model 10 and exchange
During voltage, DC bushing 6 discharges the network of casing 2 with sleeve pipe 7 is exchanged.
In addition, being respectively arranged with transformer oil oil inlet and oil-out in casing 2, pass through oil between oil inlet and oil-out
Pipe 11 is connected；Oil circulating pump 12 is installed in oil pipe 11, to realize that transformer oil 5 circulates in casing 4 and oil pipe 11,
Simulate converter power transformer in transformer oil circulate process, prevent casing 4 because transformer oil Volume Changes and caused by casing 4 deformation；
Among being filled in casing 4 and oil pipe 11 due to transformer oil 5, therefore it can keep exchanging sleeve pipe 7 and DC bushing 6 and electric discharge
Insulating properties between model 10 and casing 4, prevent from exchanging sleeve pipe 7 and DC bushing 6 and discharging model 10 in experiment to casing 4
Flash-over characteristic measurement is disturbed, prevents electric discharge damage package unit.Meanwhile heater box 16 is also equipped with oil pipe 11, to realize
Transformer oil 5 in casing 4 and the tunnel of oil pipe 11 is heated, the change of current in normal operation is simulated and becomes mistake of the conductor temp.-elevating to heating
Journey.
As shown in Fig. 2 in actually measurement application, need to be only connected in DC bushing 6 with the end shield for exchanging sleeve pipe 7
First discharge instrument 1 and the second discharge instrument 2, you can (to be put to discharge signal of the discharging model 10 under alternating current-direct current composite voltage
Electrical feature) measure；And it is connected with the 3rd discharge instrument in the transformer oil 5 in casing 2, you can to exist to discharging model 10
Transmission intensity of the discharge signal in transformer oil 5 under alternating current-direct current composite voltage measures.
It follows that converter power transformer discharge characteristic experimental rig of the present utility model can carry out converter power transformer difference
Discharge characteristic experiment under fault mode, meanwhile, by DC bushing and the end shield for exchanging sleeve pipe and the transformation in casing
The first discharge instrument, the second discharge instrument and the 3rd discharge instrument are connected in oil, you can to extract converter power transformer (electric discharge mould
Type) discharge characteristic under alternating current-direct current composite voltage, overcome chromatography in oil can not accurately provide the internal specific electric discharge class of change of current change
It is insufficient existing for type, the feature under different discharge characteristics can be also provided, overcomes AC transformer discharge characteristic to apply completely
The change of current becomes the deficiency of internal discharge fault diagnosis under the effect of alternating current-direct current composite voltage, to its electric discharge event of effectively lifting converter power transformer
Barrier diagnostic accuracy is had great significance, and the safe and stable operation of electric device is had great significance, and power supply is protected
Barrier has important technical support, while can bring great economic benefit.
In the present embodiment, above-mentioned DC voltage generator 8, ac voltage withstanding equipment 9, casing 4 and oil pipe 11 all with greatly
Ground connects, and zero potential is kept, with the safety and accuracy of guarantee test.Specifically, above-mentioned DC bushing 6 with exchange sleeve pipe 7
Using the YJZCG4 molded cannulas of Guangdong Changniu Electric Co., Ltd., DC voltage generator 8 is using Suzhou
Z-GW-300kV/4mA -0.05% high stable the DC voltage generators of industrial park Hai Wo Science and Technology Ltd.s, ac voltage withstanding
Equipment 9 adds using the HVFRF type automatic frequency adjustment series resonance test devices of Ultra-HV Transmission Company of China Southern Power Grid Co., Ltd.
Hot tank 16 is using the ZX28-80 types of Shanghai Si Zhe Electric Applicance Co., Ltd, and oil circulating pump 12 is using Oran gram, Kunshan pump
Serial (high-accuracy) the high temperature Vortex pumps of the WF of industry Manufacturing Co., Ltd.
Specifically, above-mentioned discharging model 10 is replaceable model, that is to say, that can be according to different fault diagnosises
To change different discharging models, specifically, in the present embodiment, the discharging model 10 includes the change of current and become inside body insulating part
Bubble-discharge model, the change of current become suspended conductor discharging model and the change of current becomes body insulating part internal discharge model.
Wherein, as shown in figure 3, the change of current, which becomes body insulating part internal air gap discharging model, includes DC electrode 20, exchange
Electrode 30 and the insulating paper 40 for being internally provided with cavity 41 and being in contact with DC electrode and ac electrode；The DC electrode
20 and DC bushing 6 be electrically connected, with to insulating paper 40 apply DC voltage；Ac electrode 30 is electrically connected with sleeve pipe 7 is exchanged,
To apply alternating voltage to insulating paper 40.By being internally provided with cavity 41 (cavity major air) in insulating paper 40 to simulate
Technology controlling and process is bad during the manufacturing causes defect.
As shown in figure 4, the change of current become suspended conductor discharging model include DC electrode 20, becket 50, insulating paper 40 with
And ac electrode 30；Wherein, the becket 50 is positioned on the upper surface of insulating paper 40, between DC electrode 20 and becket 50
Small gap is kept, to simulate screw in converter power transformer, bonding wire loose contact, is suspended in converter power transformer
Caused electric discharge；And the DC electrode 20 and DC bushing 6 are electrically connected, to apply DC voltage to insulating paper 40；Alternating current
Pole 30 and the lower surface of insulating paper 40 are in contact, and ac electrode 30 is electrically connected with sleeve pipe 7 is exchanged, to apply to insulating paper 40
Alternating voltage.
As shown in figure 5, the change of current become body insulating part internal discharge model include DC electrode 20, ac electrode 30 and
The insulating paper 40 being in contact with DC electrode 20 and ac electrode 30；Wherein, different from two kinds of above-mentioned discharging models, originally putting
In electric model, that one end that DC electrode 20 and insulating paper 40 are in contact is aciculiform shape, can fully simulate converter transformer fields inside
Strong the problem of concentrating, the internal discharge of insulating paper 40 is in turn resulted in, realize that the change of current becomes the simulation of body insulating part internal discharge；Direct current
Electrode 20 and DC bushing 6 are electrically connected, to apply DC voltage to insulating paper 40；Ac electrode 30 with exchange the phase of sleeve pipe 7 electricity
Connection, to apply alternating voltage to insulating paper 4.
Specifically, as shown in fig. 6, the first above-mentioned discharge instrument 1 and the second discharge instrument 2 include impedance, signal picker,
Signal amplifier, traffic filter, current converter and oscillograph composition；Wherein, one end of impedance and DC bushing or friendship
The end shield of stream sleeve pipe is electrically connected, other end ground connection, for measuring the adaptation of converter power transformer discharge characteristic experimental rig electric discharge
Impedance, to obtain discharge voltage signal, using the CBB131 types using Nantong Jianghai Capacitor Co., Ltd；Signal
Collector is attempted by the both ends of the first impedance, to gather the discharge voltage signal of impedance output；Signal amplifier and signal acquisition
The output end of device is connected, and is amplified with the discharge voltage signal exported to signal picker, signal amplifier using
Shenzhen roc, which is powered, interrogates the PT-26 signal amplifiers of Technology Co., Ltd.；The output end phase of traffic filter and signal amplifier
Connection, the interference signal after being amplified with filtering in discharge voltage signal, using using the limited public affairs of the grand electronics of Shenzhen's Xingtai
The ACH3218-103-TD01 common-mode filters of department；Current converter is connected with the output end of traffic filter, will filtering
Discharge voltage signal afterwards is converted to discharge current signal, is put using the TC75S54F computings using semiconductor company of Toshiba
Big device；Oscillograph is connected with the output end of current converter, to show the waveform of discharge current signal and electric current Value Data, uses
In extraction discharge characteristic, using the DS6000 digital oscilloscopes of BeiJing PuYuanJing power Science Co., Ltd.Thus, first put
Electric instrument and the second discharge instrument can reach following performance indications：
Detection sensitivity：≤0.1pC；
Linearity error：≤ ± 3%；
Sampling rate：65MS/s；
Range gearshift error：≤ ± 3%；
Sampling precision：12Bit；
Pulse resolving time：1μs；
Measure frequency band：10~80kHz of lower limit, 100~1000kHz of the upper limit；
Detect impedance：The μ F of 6pF~250；
Gain：- 20~40dB；
Calibrator：2~50000pC, rising edge ＜ 60ns, trailing edge ＞ 100 μ s；
It is synchronous：Mode is wired, wireless, 30~300Hz of frequency, voltage AC10~220V, 0.01 ° of precision, and wireless distances >=
75m。
Wherein, as shown in fig. 7, above-mentioned 3rd discharge instrument 3 structure substantially and the first discharge instrument 1 and the second discharge instrument 2
Identical, difference is, the 3rd discharge instrument 3 also includes antenna and transformer.Wherein, the transformer oil in the antenna and casing
It is connected, for detecting discharge signal of the transformer discharge token test device under alternating current-direct current composite voltage in transformer oil
Propagate, when discharging model discharges under alternating current-direct current composite voltage has electric discharge in transformer oil, voltage letter can be induced on antenna
Number, the antenna using Unictron Technologies Corp. Combo Antenna type miniature antennas.And transformer is once
Side is connected with antenna, and the discharge signal induced for measuring antenna, the secondary side of transformer is connected with impedance, will
Discharge signal is sent in impedance, and transformer is accurate using the KHCV3P1C measurements of Laiwu City Ke Hui Electronics Co., Ltd.s
Current mode voltage transformer.
One kind as above-mentioned converter power transformer discharge characteristic experimental rig is preferably also equipped with oil in above-mentioned oil pipe 11
Speed counts 13 and takes hydraulic fluid port 14；Wherein, the oily speed is counted for measuring the flow velocity that transformer oil circulates in oil pipe, to prevent transformer oil from following
The bad too fast oil flow electrification in discharging model, using the TD-F3L doppler velocimeters of the sensible finite instrument company in Jiangsu；
This take hydraulic fluid port be used for realize the transformer oil in oil pipe is released, control transformer oil interacts with extraneous.
Another kind as above-mentioned converter power transformer discharge characteristic experimental rig is preferably provided with absolutely in the bottom of casing 4
Edge pillar 15, for supporting the total weight of the body of case 4, and the insulating properties between casing 4 and the earth are kept, with guarantee test
The accuracy of safety and result of the test.
With reference to an example specifically how the former of converter power transformer is diagnosed to be to describe in detail with the present apparatus
Hinder position and type：
(1) it is connected to the first electric discharge in transformer oil of the DC bushing with the end shield for exchanging sleeve pipe and in casing
Instrument, the second discharge instrument and the 3rd discharge instrument.
(2) the electric discharge matrix P that the change of current becomes body insulating part internal air gap discharging model is obtained
Become body insulating part internal air gap discharging model 150 by making the change of current, be put into converter power transformer discharge characteristic
In the discharging model installed position of experimental rig, body is become by DC voltage generator and ac voltage withstanding device for flow and insulated
Part internal air gap discharging model carries out alternating current-direct current composite voltage, is measured by the first discharge instrument, the second discharge instrument, the 3rd discharge instrument
Discharge signal, it is that a current value is obtained every one millisecond from the signal in discharge instrument 11, discharge instrument 12, discharge instrument 13, first
Discharge instrument, the second discharge instrument and the 3rd discharge instrument each collect 3000 current values, altogether 9000 current values, will be single
The change of current becomes the first discharge instrument of body insulating part internal air gap discharging model, the second discharge instrument, the discharge current value of the 3rd discharge instrument
The size for writing matrix P, P successively is 150 × 9000, and the matrix only has a row, and 1-3000 current value in the row is first
The current value that discharge instrument measures successively；3001-6000 current value in the row is the electricity that the second discharge instrument measures successively
Flow valuve；3001-6000 current value in the row is the current value that the second discharge instrument measures successively；6001- in the row
9000 current values are the current value that the 3rd discharge instrument measures successively.
(3) the electric discharge matrix P1 that the change of current becomes suspended conductor discharging model is obtained
Become 150, body insulating part internal discharge model by making the change of current, be put into the experiment of converter power transformer discharge characteristic
In the discharging model installed position of device, rheology suspended conductor is exchanged by DC voltage generator and ac voltage withstanding equipment and put
Electric model carries out alternating current-direct current composite voltage, and discharge signal is measured by the first discharge instrument, the second discharge instrument, the 3rd discharge instrument, from
Discharge instrument 11, discharge instrument 12, the signal in discharge instrument 13 are to obtain a current value, the first discharge instrument, second every one millisecond
Discharge instrument and the 3rd discharge instrument each collect 3000 current values, altogether 9000 current values, and the single change of current is become and suspended
The discharge instrument of conductive discharge model first, the second discharge instrument, the discharge current value of the 3rd discharge instrument write matrix P1 successively, and P1's is big
Small is 150 × 9000, and the matrix only has a row, and 1-3000 current value in the row is what the first discharge instrument measured successively
Current value；3001-6000 current value in the row is the current value that the second discharge instrument measures successively；3001- in the row
6000 current values are the current value that the second discharge instrument measures successively；6001-9000 current value in the row is put for the 3rd
The current value that electric instrument measures successively.
(4) the electric discharge matrix P2 that the change of current becomes body insulating part internal discharge model is obtained
Become 150, body insulating part internal discharge model by making the change of current, be put into the experiment of converter power transformer discharge characteristic
In the discharging model installed position of device, rheology body insulating part is exchanged by DC voltage generator and ac voltage withstanding equipment
Internal discharge model carries out alternating current-direct current composite voltage, passes through the first discharge instrument, the second discharge instrument, the 3rd discharge instrument measurement electric discharge letter
Number, it is that a current value is obtained every one millisecond from the signal in discharge instrument 11, discharge instrument 12, discharge instrument 13, the first discharge instrument,
Second discharge instrument and the 3rd discharge instrument each collect 3000 current values, altogether 9000 current values, and the single change of current is become
The first discharge instrument of body insulating part internal discharge model, the second discharge instrument, the discharge current value of the 3rd discharge instrument write square successively
Battle array P2, P2 size are 150 × 9000, and the matrix only has a row, 1-3000 current value in the row for the first discharge instrument according to
The secondary current value measured；3001-6000 current value in the row is the current value that the second discharge instrument measures successively；The row
In 3001-6000 current value be the current value that measures successively of the second discharge instrument；6001-9000 electric current in the row
It is worth the current value measured successively for the 3rd discharge instrument.
(5) the center vector P4 of discharge characteristic extraction is calculated
Electric discharge matrix P, the change of current change suspended conductor obtained according to change of current change body insulating part internal air gap discharging model is put
The electric discharge matrix P1 of electric model, the change of current become the electric discharge matrix P2 of body insulating part internal discharge model, using formula below come
The size of center vector P4, the P4 vector of the electric discharge matrix discharge characteristic extraction of calculating is 1 × 9000.
P4jCentered on jth arranges in vectorial P4 numerical value, PijThe numerical value arranged for the i-th row jth in matrix P,
P1ijThe numerical value arranged for the i-th row jth in matrix P, P2ijThe numerical value arranged for the i-th row jth in matrix P.
(6) the pole span vector D of converter power transformer experimental rig discharge characteristic is calculated
Become the electric discharge matrix P of body insulating part internal air gap discharging model by calculating the change of current, the change of current becomes suspended conductor and put
The electric discharge matrix P1 of electric model, the change of current become the electric discharge matrix P2 of body insulating part internal discharge model each row of data respectively with
Heart vector P4 geometry pole span, the size for forming pole span vector D, D is 1 × 3N, DjFor the numerical value of pole span vector D jth row；
Wherein, the change of current becomes the electric discharge matrix P of body insulating part internal air gap discharging model each row of data and center vector
P4 geometry pole span：
The change of current becomes the geometry pole span of the electric discharge matrix P1 of suspended conductor discharging model each row of data and center vector P4：
The change of current becomes the electric discharge matrix P2 of body insulating part internal discharge model each row of data respectively with center vector P4's
Geometry pole span：
By it was found that：
As pole span vector D element DjNumerical value numerical value more than 0 and less than 3.4 when, numerical characteristics be the change of current become this
Body insulating part internal air gap is discharged, then it represents that converter power transformer abort situation is insulating paper；
As pole span vector D element DjNumerical value more than 3.4 and less than 9.8 when, numerical characteristics be the change of current become suspension lead
The electric discharge of body discharging model, then it represents that converter power transformer abort situation is current potential connecting line loose contact；
As pole span vector D element DjNumerical value when more than 9.8, numerical characteristics be the change of current become body insulating part inside puts
The electric discharge of electric model, then it represents that converter power transformer abort situation is insulating paper internal discharge.
In this way, by using the change of current transformation of the first discharge instrument, the second discharge instrument and the 3rd discharge instrument to actual motion
Device carries out diagnostic measurement, same to obtain 9000 current values altogether, and the first discharge instrument, the second discharge instrument and the 3rd are discharged
The discharge current value of instrument writes matrix P5 successively, and matrix P5 size is similarly 1 × 9000, then calculating matrix P5 and center to
Measure P4 pole span d：
In formula, P5jFor the data value of middle P5 jth row
That is, if d value then represents corresponding abort situation when falling into above-mentioned corresponding number range value, than
Such as, when d value is 2.14, then it represents that converter power transformer abort situation is insulating paper；When d value is 4, then it represents that the change of current becomes
Screw, bonding wire loose contact in depressor；When d values are 8.21, then it represents that the failure of converter power transformer is fields inside
It is strong to concentrate.
It follows that the abort situation and failure classes of converter power transformer can be accurately diagnosed to be by using the present apparatus
Type.
In addition, in order to ensure the accuracy of diagnostic result, the number of above-mentioned discharging model is no less than 150, each discharge instrument
The frequency of current value is obtained for one millisecond, the current value that collects not less than 3000.
For above-described embodiment simply to illustrate that technical concepts and features of the present utility model, the purpose is to be to allow this area
Interior those of ordinary skill can understand content of the present utility model and implement according to this, can not be limited with this of the present utility model
Protection domain.The equivalent change or modification that every essence according to the utility model content is made, should all cover in this reality
With in new protection domain.
Claims (9)
- A kind of 1. converter power transformer discharge characteristic experimental rig, it is characterised in that includingCasing, its inside are full of transformer oil, DC bushing are separately installed with the two sides of casing and exchanges sleeve pipe；In casing In be respectively arranged with transformer oil oil inlet and oil-out, be connected between oil inlet and oil-out by oil pipe；Discharging model, it is arranged in casing；The direct current of discharging model is extreme and DC bushing is electrically connected, and alternating current is extreme Be electrically connected with sleeve pipe is exchanged, to bear alternating current-direct current composite voltage, simulation converter power transformer normally with the operating mode under failure；DC voltage generator, it is electrically connected by lead and DC bushing, for producing DC voltage and being applied to electric discharge The direct current of model is extreme, realizes the simulation of converter power transformer direct current operating mode；Ac voltage withstanding equipment, it is electrically connected by lead with sleeve pipe is exchanged, for producing alternating voltage and being applied to electric discharge mould The alternating current of type is extreme, realizes the simulation of converter power transformer AC Condition；Oil circulating pump, it is installed in oil pipe, to realize that transformer oil circulates in casing and oil pipe；Heater box, it is installed in oil pipe, to heat the transformer oil in oil pipe.
- 2. converter power transformer discharge characteristic experimental rig as claimed in claim 1, it is characterised in that the discharging model is can The model of replacing, including the change of current become body insulating part internal air gap discharging model, for analog insulation paper in the process of manufacturing Middle technology controlling and process bad the defects of causing；The change of current becomes suspended conductor discharging model, for simulating current potential connecting line loose contact, hangs Float on caused electric discharge problem in converter power transformer；And the change of current becomes body insulating part internal discharge model, for analog insulation The problem of paper internal discharge.
- 3. converter power transformer discharge characteristic experimental rig as claimed in claim 2, it is characterised in that it is exhausted that the change of current becomes body Edge part internal air gap discharging model include DC electrode, ac electrode and be internally provided with cavity and with DC electrode with exchange The insulating paper of contact electrode；Wherein, the DC electrode and DC bushing are electrically connected, to apply direct current to insulating paper Pressure；Ac electrode is electrically connected with sleeve pipe is exchanged, to apply alternating voltage to insulating paper.
- 4. converter power transformer discharge characteristic experimental rig as claimed in claim 2, it is characterised in that the change of current becomes suspension and led Body discharging model includes DC electrode, becket, insulating paper and ac electrode；Wherein, the becket is positioned over insulating paper Upper surface on, gap between DC electrode and becket be present, DC electrode and DC bushing are electrically connected, with to insulating paper Apply DC voltage；The lower surface of ac electrode and insulating paper is in contact, and ac electrode is electrically connected with sleeve pipe is exchanged, with to exhausted Edge paper applies alternating voltage.
- 5. converter power transformer discharge characteristic experimental rig as claimed in claim 2, it is characterised in that it is exhausted that the change of current becomes body Edge part internal discharge model includes DC electrode, ac electrode and the insulating paper being in contact with DC electrode and ac electrode； Wherein, that one end that the DC electrode and insulating paper are in contact is aciculiform shape, and DC electrode and DC bushing are electrically connected, with DC voltage is applied to insulating paper；Ac electrode is electrically connected with sleeve pipe is exchanged, to apply alternating voltage to insulating paper.
- 6. converter power transformer discharge characteristic experimental rig as claimed in claim 1, it is characterised in that also pacify in the oil pipe Equipped with oily speed meter, for measuring the flow velocity that transformer oil circulates in oil pipe.
- 7. the converter power transformer discharge characteristic experimental rig as described in claim 1 or 6, it is characterised in that in the oil pipe It is additionally provided with and takes hydraulic fluid port, the transformer oil in oil pipe is released for realizing, control transformer oil interacts with the external world.
- 8. converter power transformer discharge characteristic experimental rig as claimed in claim 1, it is characterised in that the DC voltage occurs Device, ac voltage withstanding equipment, casing and oil pipe are all connected with the earth, keep zero potential.
- 9. converter power transformer discharge characteristic experimental rig as claimed in claim 1, it is characterised in that in the bottom of the casing Insulation branch is installed, for the total weight of supporting box, and keeps the insulating properties between casing and the earth.
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| CN107255781A (en) * | 2017-07-14 | 2017-10-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of converter power transformer discharge characteristic experimental rig |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107255781A (en) * | 2017-07-14 | 2017-10-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of converter power transformer discharge characteristic experimental rig |
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