CN207020277U - A kind of converter power transformer discharge characteristic pilot system - Google Patents
A kind of converter power transformer discharge characteristic pilot system Download PDFInfo
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- CN207020277U CN207020277U CN201720850917.XU CN201720850917U CN207020277U CN 207020277 U CN207020277 U CN 207020277U CN 201720850917 U CN201720850917 U CN 201720850917U CN 207020277 U CN207020277 U CN 207020277U
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Abstract
The utility model discloses a kind of converter power transformer discharge characteristic pilot system, the system is mainly made up of converter power transformer discharge characteristic experimental rig, the first discharge instrument, the second discharge instrument and the 3rd discharge instrument.Converter power transformer discharge characteristic pilot system of the present utility model can carry out the discharge characteristic experiment under converter power transformer different faults pattern, also the change of current can be extracted and become discharge characteristic under alternating current-direct current composite voltage, 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 power system has great significance, there is important technical support to power supply guarantee, bring great economic benefit 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 pilot system.
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 DC transmission system 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 system parameter that is coupled of straight-flow system.
Converting plant, AC system and straight-flow system 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.
The content of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of high change of current of diagnostic accuracy becomes
Depressor discharge characteristic pilot system.
To achieve the above object, the technical solution of the utility model is：
A kind of converter power transformer discharge characteristic pilot system, including converter power transformer discharge characteristic experimental rig, first put
Electric instrument, the second discharge instrument and the 3rd discharge instrument；Wherein,
The converter power transformer discharge characteristic experimental rig includes
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；
DC bushing with the first discharge instrument of structure identical and second are respectively electrically connected with the end shield for exchanging sleeve pipe
Discharge instrument, for measuring discharge signal of the discharging model under alternating current-direct current composite voltage；
3rd discharge instrument is connected with the transformer oil in casing, for electric discharge of the discharging model under alternating current-direct current composite voltage
Propagation measurement intensity of the signal in transformer oil.
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.
First discharge instrument and the second discharge instrument include impedance, signal picker, signal amplifier, signal filtering
Device, current converter and oscillograph composition；Wherein, one end of impedance and DC bushing or exchange the end shield of sleeve pipe and be mutually electrically connected
Connect, other end ground connection, for measuring the adaptation impedence of converter power transformer discharge characteristic experimental rig electric discharge, to obtain discharge voltage
Signal；Signal picker is attempted by the both ends of the first impedance, to gather the discharge voltage signal of impedance output；Signal amplifier and
The output end of signal picker is connected, and is amplified with the discharge voltage signal exported to signal picker；Traffic filter
It is connected with the output end of signal amplifier, the interference signal after being amplified with filtering in discharge voltage signal；Current converter and
The output end of traffic filter is connected, and the discharge voltage signal after filtering is converted into discharge current signal；Oscillograph and
The output end of current converter is connected, and to show the waveform of discharge current signal and data, extracts discharge characteristic；
The structure of 3rd discharge instrument is basic identical with the first discharge instrument and the second discharge instrument, and difference is,
Also include antenna and transformer, the antenna is connected with the transformer oil in casing, for detecting the examination of transformer discharge feature
Propagation of discharge signal of the experiment device under alternating current-direct current composite voltage in transformer oil；The primary side of transformer is connected with antenna
Connect, the discharge signal induced for measuring antenna, the secondary side of transformer is connected with impedance, discharge signal is transmitted
Into impedance.
Oily speed meter is also equipped with the oil pipe and takes hydraulic fluid port, the oily speed is counted to be circulated for measuring transformer oil in oil pipe
Flow velocity, it is described take hydraulic fluid port be used for realize the transformer oil in oil pipe is released, control transformer oil interacts with extraneous.
The DC voltage generator, ac voltage withstanding equipment, casing and oil pipe are all connected with the earth, keep zero potential；
The bottom of the casing is provided with insulation branch, for the total weight of supporting box, and keeps the insulating properties between casing and the earth
Energy.
Compared with prior art, its advantage is the utility model：
Converter power transformer discharge characteristic pilot system of the present utility model can carry out converter power transformer different faults pattern
Under discharge characteristic experiment, can also extract converter power transformer discharge characteristic under alternating current-direct current composite voltage, overcome chromatography in oil
The change of current can not accurately be provided and become insufficient existing for internal specific electric discharge type, can also provide the feature under different discharge characteristics, gram
Internal discharge fault diagnosis can not be become using the lower change of current of alternating current-direct current composite voltage effect completely by taking AC transformer discharge characteristic
Deficiency, the safe and stable operation to effectively lifting its discharge fault diagnostic accuracy of converter power transformer and to power system have emphatically
The meaning wanted, there is important technical support to power supply guarantee, while bring great economic benefit.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model converter power transformer discharge characteristic pilot system；
Fig. 2 is the structural representation that the change of current becomes body insulating part internal air gap discharging model；
Fig. 3 is the structural representation that the change of current becomes suspended conductor discharging model；
Fig. 4 is the structural representation that the change of current becomes body insulating part internal discharge model；
Fig. 5 is the structural representation of the first discharge instrument and the second discharge instrument；
Fig. 6 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 pilot system provided for the present embodiment, should
System includes converter power transformer discharge characteristic experimental rig, the first discharge instrument 1, the second discharge instrument 2 and the 3rd discharge instrument 3；Its
In, the converter power transformer discharge characteristic experimental rig includes casing 4, and the inside of casing 4 is full of transformer oil 5, in the both sides of casing 4
DC bushing 6 is separately installed with face and exchanges sleeve pipe 7, wherein, the DC bushing 6 passes through lead and DC voltage generator 8
It is electrically connected, exchange sleeve pipe 7 is electrically connected by lead and ac voltage withstanding equipment 9, meanwhile, electric discharge mould is placed with casing 4
Type 10, the direct current of the discharging model 10 are extremely electrically connected with DC bushing 6, alternating current extremely with exchange the phase of sleeve pipe 7 and be electrically connected
Connect, in this way, when DC voltage generator 8 works, its caused high direct voltage can then be applied to the direct current of discharging model 10
Extremely, 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 electricity
The alternating current that pressure can then be applied to discharging model 10 is extreme, realizes that the change of current becomes the simulation of transformer alternating operating mode, that is to say, that should
Discharging model 10 will bear alternating current-direct current composite voltage, and simulate the change of current become transformer normally with the operating mode under failure；On in addition,
The DC bushing 6 stated with exchange sleeve pipe 7 and casing 4 all keeps insulation safety, to prevent from applying discharging model 10 plus DC voltage
During with alternating 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, mould
Intend converter power transformer in transformer oil circulate process, prevent casing 4 because transformer oil Volume Changes and caused by casing 4 deformation；By
Among transformer oil 5 is filled in casing 4 and oil pipe 11, therefore it can keep exchanging sleeve pipe 7 and DC bushing 6 and electric discharge mould
Insulating properties between type 10 and casing 4, prevent from exchanging sleeve pipe 7 and DC bushing 6 in experiment and discharging model 10 is dry to casing 4
Flash-over characteristic measurement is disturbed, prevents electric discharge damage whole system.Meanwhile heater box 16 is also equipped with oil pipe 11, with realization pair
Transformer oil 5 in casing 4 and the tunnel of oil pipe 11 is heated, and is simulated the change of current in normal operation and is become process of the conductor temp.-elevating to heating.
DC bushing 6 with the first discharge instrument of structure identical 1 and are respectively electrically connected with the end shield for exchanging sleeve pipe 7
Two discharge instruments 2, for being measured to discharge signal (i.e. discharge characteristic) of the discharging model 10 under alternating current-direct current composite voltage；The
Three discharge instruments 3 are connected with the transformer oil 5 in casing 2, for believing electric discharge of the discharging model 10 under alternating current-direct current composite voltage
Transmission intensity number in transformer oil 5 measures.
It follows that converter power transformer discharge characteristic pilot system of the present utility model can carry out converter power transformer difference
Discharge characteristic experiment under fault mode, can also extract the spy that discharged under converter power transformer (discharging model) alternating current-direct current composite voltage
Sign, overcome chromatography in oil can not accurately provide change of current change inside specifically deficiency existing for electric discharge type, can also provide difference and put
Feature under electrical feature, overcome AC transformer discharge characteristic can not be completely using in the lower change of current change of alternating current-direct current composite voltage effect
The deficiency of portion's discharge fault diagnosis, has great significance to effectively its discharge fault diagnostic accuracy of lifting converter power transformer, right
The safe and stable operation of power system has great significance, and has important technical support to power supply guarantee, 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 systems 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 Fig. 2 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
It is electrically connected with DC bushing 6, to apply DC voltage to insulating paper 40；Ac electrode 30 is electrically connected with sleeve pipe 7 is exchanged, with
Alternating voltage is applied to insulating paper 40.By being internally provided with cavity 41 (cavity major air) in insulating paper 40 to simulate life
Technology controlling and process is bad in production manufacturing process causes defect.
As shown in figure 3, 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, and are handed over applying to insulating paper 40
Flow voltage.
As shown in figure 4, 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 figure 5, 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. 6, 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 pilot system 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 that it is bad that transformer oil from following
The too fast oil flow electrification in discharging model, using the TD-F3L doppler velocimeters of the sensible finite instrument company in Jiangsu；Should
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 pilot system 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 the peace of guarantee test
Complete and result of the test accuracy.
With reference to an example specifically how the former of converter power transformer is diagnosed to be to describe in detail with the system
Hinder position and type：
(1) 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.
(2) 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 the electricity that the first discharge instrument measures successively
Flow valuve；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.
(3) 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 current value in the row
The current value measured successively for the 3rd discharge instrument.
(4) 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.
(5) 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
As long as that is, d value then represented when falling into above-mentioned corresponding number range value corresponding to abort situation and
Type, 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 table
Show screw in converter power transformer, bonding wire loose contact；When d values are 8.21, then it represents that the failure of converter power transformer
Concentrated for internal field strength.
It follows that the abort situation and failure classes of converter power transformer can be accurately diagnosed to be by using the system
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 (10)
1. a kind of converter power transformer discharge characteristic pilot system, it is characterised in that test and fill including converter power transformer discharge characteristic
Put, the first discharge instrument, the second discharge instrument and the 3rd discharge instrument；Wherein,
The converter power transformer discharge characteristic experimental rig includes
Casing, 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；
DC bushing with the first discharge instrument and the second discharge instrument are respectively electrically connected with the end shield for exchanging sleeve pipe, for measuring
Discharge signal of the discharging model under alternating current-direct current composite voltage；
3rd discharge instrument is connected with the transformer oil in casing, for measuring to discharging model putting under alternating current-direct current composite voltage
Transmission intensity of the electric signal in transformer oil.
2. converter power transformer discharge characteristic pilot system 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 pilot system 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 pilot system 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 pilot system 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 pilot system as claimed in claim 1, it is characterised in that first discharge instrument and
Second discharge instrument structure it is identical include impedance, signal picker, signal amplifier, traffic filter, current converter and
Oscillograph forms；Wherein, one end of impedance and DC bushing or exchange the end shield of sleeve pipe and be electrically connected, other end ground connection, be used for
The adaptation impedence of converter power transformer discharge characteristic experimental rig electric discharge is measured, to obtain discharge voltage signal；Signal picker is simultaneously
The both ends of the first impedance are connected on, to gather the discharge voltage signal of impedance output；The output of signal amplifier and signal picker
End is connected, and is amplified with the discharge voltage signal exported to signal picker；Traffic filter and signal amplifier it is defeated
Go out end to be connected, the interference signal after with filtering amplifying in discharge voltage signal；The output of current converter and traffic filter
End is connected, and the discharge voltage signal after filtering is converted into discharge current signal；The output of oscillograph and current converter
End is connected, and to show the waveform of discharge current signal and data, extracts discharge characteristic；
The structure of 3rd discharge instrument is basic identical with the first discharge instrument and the second discharge instrument, and difference is, also wraps
Antenna and transformer are included, the antenna is connected with the transformer oil in casing, for detecting transformer discharge token test dress
Put propagation of the discharge signal under alternating current-direct current composite voltage in transformer oil；The primary side of transformer is connected with antenna, uses
In the discharge signal that measurement antenna is induced, the secondary side of transformer is connected with impedance, and discharge signal is sent into resistance
In anti-.
7. converter power transformer discharge characteristic pilot system as claimed in claim 1, it is characterised in that also pacify in the oil pipe
Equipped with oily speed meter, the oily speed is counted for measuring the flow velocity that transformer oil circulates in oil pipe.
8. the converter power transformer discharge characteristic pilot system as described in claim 1 or 7, it is characterised in that in the oil pipe
Be also equipped with taking hydraulic fluid port, it is described take hydraulic fluid port be used for realize the transformer oil in oil pipe is released, control transformer oil interacts with extraneous.
9. converter power transformer discharge characteristic pilot system 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.
10. converter power transformer discharge characteristic pilot system as claimed in claim 1, it is characterised in that at the bottom of the casing
Portion is provided with insulation column, for the total weight of supporting box, and keeps the insulating properties between casing and the earth.
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| CN201720850917.XU CN207020277U (en) | 2017-07-14 | 2017-07-14 | A kind of converter power transformer discharge characteristic pilot system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107329058A (en) * | 2017-07-14 | 2017-11-07 | 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 pilot system and method for diagnosing faults |
| CN111781471A (en) * | 2020-07-02 | 2020-10-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Transformer alternating current-direct current composite voltage withstand test system and method |
| CN113092968A (en) * | 2021-04-14 | 2021-07-09 | 哈尔滨理工大学 | Automatic testing system for AC/DC breakdown field intensity of film sample |
| CN114371375A (en) * | 2021-12-24 | 2022-04-19 | 山东大学 | Method and system for simulating and measuring arc discharge in converter transformer insulating oil |
-
2017
- 2017-07-14 CN CN201720850917.XU patent/CN207020277U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107329058A (en) * | 2017-07-14 | 2017-11-07 | 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 pilot system and method for diagnosing faults |
| CN111781471A (en) * | 2020-07-02 | 2020-10-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Transformer alternating current-direct current composite voltage withstand test system and method |
| CN113092968A (en) * | 2021-04-14 | 2021-07-09 | 哈尔滨理工大学 | Automatic testing system for AC/DC breakdown field intensity of film sample |
| CN114371375A (en) * | 2021-12-24 | 2022-04-19 | 山东大学 | Method and system for simulating and measuring arc discharge in converter transformer insulating oil |
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