CN104833929A - Transformer demagnetization analyzer - Google Patents
Transformer demagnetization analyzer Download PDFInfo
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- CN104833929A CN104833929A CN201510214514.1A CN201510214514A CN104833929A CN 104833929 A CN104833929 A CN 104833929A CN 201510214514 A CN201510214514 A CN 201510214514A CN 104833929 A CN104833929 A CN 104833929A
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Abstract
The invention discloses a transformer demagnetization analyzer. The transformer demagnetization analyzer comprises a first direct-current residual magnetism analysis demagnetization output terminal, a second direct-current residual magnetism analysis demagnetization output terminal, a power supply direction switching module, a direct-current numerical control constant current source, a first optical isolator acquisition resistor Rb, a switch K1, a microprocessor, a reverse electromotive force protection module, a first program-controlled amplifier, a first A/D converter, a first optical isolator connection, a second program-controlled amplifier, a second A/D converter, a second optical isolator, an instruction input module, a display module, an alternating-current residual magnetism analysis output terminal, a voltage and current test module, an isolated boost transformer and an electric voltage regulator. The transformer demagnetization analyzer realizes the technical effects that the transformer demagnetization analyzer is capable of carrying out demagnetization and also can detect the residual magnetism amount of the transformer, the demagnetization effect is good, and the demagnetization efficiency is relatively high.
Description
Technical field
The present invention relates to transformer safety research field, particularly relate to a kind of transformer demagnetization analyser.
Background technology
Remanent magnetism is that permanent magnet is saturated to technology through magnetization, and the surface field Br retained after removing external magnetic field, be called residual magnetic induction induction, be called for short remanent magnetism, represent with Br, unit is mT (KG) milli tesla, and KG is the system of electromagnetic units, reads as kilogauss.Conversion relation 1T=10000GS.Magnetic hysteresis loop is in magnetic field, the relation of ferromagnetic magnetic induction density and magnetic field intensity can represent with curve, when magnetizing field does the change in cycle, the magnetic induction density in ferromagnet and the relation of magnetic field intensity are closed lines, and this closed line is called magnetic hysteresis loop.
Large-scale power transformer is the pith of composition electrical network, in the safe operation of electrical network, have extremely important effect, can remain remanent magnetism in the core which to after the operations such as DC resistance of power transformer measurement.When transformer puts into operation, transformer vibration sound obviously increases, and iron core remanent magnetism makes to be that iron core half cycle is saturated, and in exciting current, produce a large amount of even-order harmonic, zero-sequence current also can increase several times.This not only adds the reactive loss of transformer, also may cause the protective device action of transformer, cause and close a floodgate unsuccessfully; The vibrations sound of transformer increases, and the structural member of transformer can be made to have an impact, and shortens the time between overhaul of transformer; Zero-sequence current increases the transformer tripping operation that even can affect neighbouring normal operation, threatens safe operation of electric network.For these reasons, large-scale power transformer is adopted an effective measure after transformer test or before putting into operation to eliminate be very necessary.
Along with the capacity of power transformer is increasing, electric pressure is more and more higher, and power transmission distance is also more and more far away.The problem that affects of transformer remanent magnetism is also paid attention to gradually by national grid.Raw No. (2011) 220, the skill (notice about issuing " measure (try) preventing high-power transformer remanent magnetism from affect ") in northwest explicitly calls for-commissioning test of 750KV main-transformer and repair based on condition of component routine test in direct current resistance test eliminate iron core remanent magnetism afterwards.
The domestic equipment and instrument having had transformer demagnetization at present, but, after existing Deperming Facility demagnetization completes, the remanent magnetism situation of the existence of transformer can not be reflected, make staff cannot know the effect of demagnetization; When the demagnetization wiring error of transformer, some equipment degaussing process can also normally proceed to demagnetization to be terminated, and the situation about judging that leads to errors occurs; And the remanent magnetism of some transformer itself is very little, use Deperming Facility even also can increase the remanent magnetism of transformer.
In sum, present inventor, in the process realizing invention technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical matters:
In the prior art, the equipment and instrument of existing transformer demagnetization exists and can only carry out transformer demagnetization, can not detect the remanent magnetism amount of transformer, and easily lead to errors judgement and operation, the technical matters of remanent magnetism is easily increased when the remanent magnetism of transformer itself is very little.
Summary of the invention
The invention provides a kind of transformer demagnetization analyser, the equipment and instrument solving existing transformer demagnetization exists and can only carry out transformer demagnetization, the remanent magnetism amount of transformer can not be detected, and easily lead to errors judgement and operation, easily increase the technical matters of remanent magnetism when the remanent magnetism of transformer itself is less, achieving transformer demagnetization analyser can not only carry out demagnetization, can also detect the remanent magnetism amount of transformer, erasure effect is better, the technique effect that demagnetization efficiency is higher.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of transformer demagnetization analyser, and described analyser comprises:
First direct current Analysis ofremanence demagnetization lead-out terminal, second direct current Analysis ofremanence demagnetization lead-out terminal, described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal are connected with the first link of power supply direction handover module and the second link respectively, 3rd link of described power supply direction handover module is all connected with the first link of inverse electromotive force protection module and the first link of DC numerical control constant current source, one end that 4th link of described power supply direction handover module gathers resistance Rb with the first link of the first programmable amplifier and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb and one end of K switch 1, second link of described inverse electromotive force protection module, second link of described first programmable amplifier all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source, described first programmable amplifier is connected with the first A/D converter, described first A/D converter is connected with the first optoisolator, described first optoisolator is connected with microprocessor, the two ends of the second programmable amplifier are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal respectively, described second programmable amplifier is connected with the second A/D converter, described second A/D converter is connected with the second optoisolator, described second optoisolator is connected with described microprocessor, described microprocessor and instruction load module, display module, described DC numerical control constant current source all connect, and described microprocessor is connected with the 5th link of described power supply direction handover module,
First exchanges Analysis ofremanence lead-out terminal, second exchanges Analysis ofremanence lead-out terminal, described first interchange Analysis ofremanence lead-out terminal and described second exchanges Analysis ofremanence lead-out terminal and is connected with electric current and voltage test module respectively, described electric current and voltage test module is connected with isolation boosting transformer, described isolation boosting transformer is connected with electric voltage regulator, described electric voltage regulator is connected with AC power, and described electric voltage regulator is all connected with described microprocessor with described electric current and voltage test module.
Wherein, described power supply direction handover module is specially the module using magnetic latching relay to carry out the switching of power supply direction, ensures that, when power supply disconnects suddenly, power supply direction is operated in stable state.
Wherein, described inverse electromotive force protection module is specially the back electromotive force protection module based on diode reverse conducting principle, can rapid discharge.
Wherein, described electric current and voltage test module specifically comprises: electrical quantity transmitter module, alternating voltage can be tested, the technical indicator of electric current, described electrical quantity transmitter module with electric energy meter chip CS5460 for core, coordinate high-accuracy voltage, current transformer forms, and measures the alternating voltage current value exported.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
Owing to have employed, transformer demagnetization analyser is designed to comprise: the first direct current Analysis ofremanence demagnetization lead-out terminal, second direct current Analysis ofremanence demagnetization lead-out terminal, described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal are connected with the first link of power supply direction handover module and the second link respectively, 3rd link of described power supply direction handover module is all connected with the first link of inverse electromotive force protection module and the first link of DC numerical control constant current source, one end that 4th link of described power supply direction handover module gathers resistance Rb with the first link of the first programmable amplifier and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb and one end of K switch 1, second link of described inverse electromotive force protection module, second link of described first programmable amplifier all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source, described first programmable amplifier is connected with the first A/D converter, described first A/D converter is connected with the first optoisolator, described first optoisolator is connected with microprocessor, the two ends of the second programmable amplifier are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal respectively, described second programmable amplifier is connected with the second A/D converter, described second A/D converter is connected with the second optoisolator, described second optoisolator is connected with described microprocessor, described microprocessor and instruction load module, display module, described DC numerical control constant current source all connect, and described microprocessor is connected with the 5th link of described power supply direction handover module, first exchanges Analysis ofremanence lead-out terminal, second exchanges Analysis ofremanence lead-out terminal, described first interchange Analysis ofremanence lead-out terminal and described second exchanges Analysis ofremanence lead-out terminal and is connected with electric current and voltage test module respectively, described electric current and voltage test module is connected with isolation boosting transformer, described isolation boosting transformer is connected with electric voltage regulator, described electric voltage regulator is connected with AC power, the technical scheme that described electric voltage regulator is all connected with described microprocessor with described electric current and voltage test module, by demagnetization function, direct current Analysis ofremanence, interchange Analysis ofremanence combines together, employ the direct current remanent magnetism detection method relatively detecting remanent magnetism of the curve of transformer forward and reverse charging electric current, can characterize more intuitively and whether there is remanent magnetism, use and exchange Analysis ofremanence lead-out terminal output AC voltage, and utilize microcontroller automatic control electric to move pressure regulator boosting and step-down, and the current waveform automatically recorded in voltage raising and reducing process, relatively rise the method whether consistent with current curve in decline process, judge whether to have remanent magnetism, the method is for exchanging Analysis ofremanence.Direct current Analysis ofremanence demagnetization lead-out terminal is utilized to carry out degaussing operation, remanent magnetism in transformer can be carried out demagnetization, utilize direct current Analysis ofremanence demagnetization lead-out terminal with exchange Analysis ofremanence lead-out terminal carry out direct current Analysis ofremanence and exchange Analysis ofremanence detect operation, the remanent magnetism content in transformer can be detected, content according to remanent magnetism carries out flexible operating, so, the equipment and instrument efficiently solving existing transformer demagnetization exists and can only carry out transformer demagnetization, the remanent magnetism amount of transformer can not be detected, and easily lead to errors judgement and operation, the technical matters of remanent magnetism is easily increased when the remanent magnetism of transformer itself is less, and then achieve transformer demagnetization analyser and can not only carry out demagnetization, the remanent magnetism amount of transformer can also be detected, erasure effect is better, the technique effect that demagnetization efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of transformer demagnetization analyser in the embodiment of the present application one;
Fig. 2 is that in the embodiment of the present application one, direct current remanent magnetism detects schematic diagram;
Fig. 3 exchanges remanent magnetism to detect schematic diagram in the embodiment of the present application one;
Fig. 4 is power supply direction handover module schematic diagram in the embodiment of the present application one;
Fig. 5 is inverse electromotive force protection module schematic diagram in the embodiment of the present application one;
Wherein, 101-demagnetization lead-out terminal, 102-direct current Analysis ofremanence lead-out terminal, 105-first exchanges Analysis ofremanence lead-out terminal, 106-second exchanges Analysis ofremanence lead-out terminal, 2-power supply direction handover module, 3-inverse electromotive force protection module, 4-first optoisolator gathers resistance Rb, 5-DC numerical control constant current source, 6-electric current and voltage test module, 7-first programmable amplifier, 8-second programmable amplifier, 9-microprocessor, 10-isolation boosting transformer, 11-second A/D converter, 12-first A/D converter, 13-instruction input module, 14-display module, 15-second optoisolator, 16-first optoisolator, 17-electric voltage regulator, 18-demagnetization output line, 19-direct current Analysis ofremanence output line, 20-first exchanges Analysis ofremanence output line, 21-second exchanges Analysis ofremanence output line.
Embodiment
The invention provides a kind of transformer demagnetization analyser, the equipment and instrument solving existing transformer demagnetization exists and can only carry out transformer demagnetization, the remanent magnetism amount of transformer can not be detected, and easily lead to errors judgement and operation, easily increase the technical matters of remanent magnetism when the remanent magnetism of transformer itself is less, achieving transformer demagnetization analyser can not only carry out demagnetization, can also detect the remanent magnetism amount of transformer, erasure effect is better, the technique effect that demagnetization efficiency is higher.
Technical scheme during the application implements is for solving the problems of the technologies described above.General thought is as follows:
Have employed and transformer demagnetization analyser is designed to comprise: the first direct current Analysis ofremanence demagnetization lead-out terminal, second direct current Analysis ofremanence demagnetization lead-out terminal, described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal are connected with the first link of power supply direction handover module and the second link respectively, 3rd link of described power supply direction handover module is all connected with the first link of inverse electromotive force protection module and the first link of DC numerical control constant current source, one end that 4th link of described power supply direction handover module gathers resistance Rb with the first link of the first programmable amplifier and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb and one end of K switch 1, second link of described inverse electromotive force protection module, second link of described first programmable amplifier all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source, described first programmable amplifier is connected with the first A/D converter, described first A/D converter is connected with the first optoisolator, described first optoisolator is connected with microprocessor, the two ends of the second programmable amplifier are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal respectively, described second programmable amplifier is connected with the second A/D converter, described second A/D converter is connected with the second optoisolator, described second optoisolator is connected with described microprocessor, described microprocessor and instruction load module, display module, described DC numerical control constant current source all connect, and described microprocessor is connected with the 5th link of described power supply direction handover module, first exchanges Analysis ofremanence lead-out terminal, second exchanges Analysis ofremanence lead-out terminal, described first interchange Analysis ofremanence lead-out terminal and described second exchanges Analysis ofremanence lead-out terminal and is connected with electric current and voltage test module respectively, described electric current and voltage test module is connected with isolation boosting transformer, described isolation boosting transformer is connected with electric voltage regulator, described electric voltage regulator is connected with AC power, the technical scheme that described electric voltage regulator is all connected with described microprocessor with described electric current and voltage test module, by demagnetization function, direct current Analysis ofremanence, interchange Analysis ofremanence combines together, employ the direct current remanent magnetism detection method relatively detecting remanent magnetism of the curve of transformer forward and reverse charging electric current, can characterize more intuitively and whether there is remanent magnetism, use and exchange Analysis ofremanence lead-out terminal output AC voltage, and utilize microcontroller automatic control electric to move pressure regulator boosting and step-down, and the current waveform automatically recorded in voltage raising and reducing process, relatively rise the method whether consistent with current curve in decline process, judge whether to have remanent magnetism, the method is for exchanging Analysis ofremanence.Direct current Analysis ofremanence demagnetization lead-out terminal is utilized to carry out degaussing operation, remanent magnetism in transformer can be carried out demagnetization, utilize direct current Analysis ofremanence demagnetization lead-out terminal with exchange Analysis ofremanence lead-out terminal carry out direct current Analysis ofremanence and exchange Analysis ofremanence detect operation, the remanent magnetism content in transformer can be detected, content according to remanent magnetism carries out flexible operating, so, the equipment and instrument efficiently solving existing transformer demagnetization exists and can only carry out transformer demagnetization, the remanent magnetism amount of transformer can not be detected, and easily lead to errors judgement and operation, the technical matters of remanent magnetism is easily increased when the remanent magnetism of transformer itself is less, and then achieve transformer demagnetization analyser and can not only carry out demagnetization, the remanent magnetism amount of transformer can also be detected, erasure effect is better, the technique effect that demagnetization efficiency is higher.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment one:
In embodiment one, provide a kind of transformer demagnetization analyser, please refer to Fig. 1-Fig. 5, described analyser comprises:
First direct current Analysis ofremanence demagnetization lead-out terminal 101, second direct current Analysis ofremanence demagnetization lead-out terminal 102, described first direct current Analysis ofremanence demagnetization lead-out terminal 101 and described second direct current Analysis ofremanence demagnetization lead-out terminal 102 are connected with the first link of power supply direction handover module 2 and the second link respectively, 3rd link of described power supply direction handover module 2 is all connected with the first link of inverse electromotive force protection module 3 and the first link of DC numerical control constant current source 5, one end that 4th link of described power supply direction handover module 3 gathers resistance Rb4 with the first link of the first programmable amplifier 7 and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb4 and one end of K switch 1, second link of described inverse electromotive force protection module 3, second link of described first programmable amplifier 7 all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source 5, described first programmable amplifier 7 is connected with the first A/D converter 12, described first A/D converter 12 is connected with the first optoisolator 16, described first optoisolator 16 is connected with microprocessor 9, the two ends of the second programmable amplifier 8 are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal 101 and described second direct current Analysis ofremanence demagnetization lead-out terminal 102 respectively, described second programmable amplifier 8 is connected with the second A/D converter 11, described second A/D converter 11 is connected with the second optoisolator 15, described second optoisolator 15 is connected with described microprocessor 9, described microprocessor 9 and instruction load module 13, display module 14, described DC numerical control constant current source 5 all connect, and described microprocessor 9 is connected with the 5th link of described power supply direction handover module 2,
First exchanges Analysis ofremanence lead-out terminal 105, second exchanges Analysis ofremanence lead-out terminal 106, described first interchange Analysis ofremanence lead-out terminal 105 and described second interchange Analysis ofremanence lead-out terminal 106 are connected with electric current and voltage test module 6 respectively, described electric current and voltage test module 6 is connected with isolation boosting transformer 10, described isolation boosting transformer 10 is connected with electric voltage regulator 17, described electric voltage regulator 17 is connected with AC power, and described electric voltage regulator 17 is all connected with described microprocessor 9 with described electric current and voltage test module 6.
Wherein, in actual applications, instruction input module is specifically as follows keyboard, and display module is specifically as follows LCDs.
Wherein, in the embodiment of the present application, described power supply direction handover module is specially the module using magnetic latching relay to carry out the switching of power supply direction, ensures that, when power supply disconnects suddenly, power supply direction is operated in stable state.Specific works mode is as follows: please refer to Fig. 4, Fig. 4 is the composition schematic diagram of power supply direction handover module, two ends of the transformer high-voltage winding needing demagnetization are received demagnetization lead-out terminal 101 and direct current Analysis ofremanence lead-out terminal 102, power supply control microprocessor direction commutation circuit points to the direction charging of demagnetization output terminal 102 by demagnetization output terminal 101 to test product Transformer Winding, namely now demagnetization lead-out terminal 101 is just, it is negative that demagnetization exports 102;
Microprocessor also can control the actuating of relay of power supply direction commutation circuit, and by contrary for the polarity furnishing of demagnetization lead-out terminal 101 and direct current Analysis ofremanence lead-out terminal 102, and demagnetization lead-out terminal 101 is negative, and direct current Analysis ofremanence lead-out terminal 102 is just.
Wherein, in the embodiment of the present application, described inverse electromotive force protection module is specially the back electromotive force protection module based on diode reverse conducting principle, can rapid discharge.Please refer to Fig. 5, Fig. 5 is inverse electromotive force protection module schematic diagram, and when constant current source normally works, 110 ends are that just 111 ends are negative.Due to the single-phase conducting of D5 diode, back-emf protection module is inoperative.When after constant current source power-off, because the load of demagnetization instrument is large-scale power transformer, have very large inductance, back-emf is very high.During back-emf, 111 is just, 110 is negative, and back-emf makes the field effect transistor conducting of A3, diode D5 forward conduction, R20, and 19 is high-power cement resistor, makes the energy ezpenditure of back-emf on resistance.Along with back-emf is more and more less, A3G turns off, and discharge prevention terminates.
Wherein, in the embodiment of the present application, described electric current and voltage test module specifically comprises: electrical quantity transmitter module, alternating voltage can be tested, the technical indicator of electric current, described electrical quantity transmitter module for core, coordinates high-accuracy voltage with electric energy meter chip CS5460, current transformer forms, and measures the alternating voltage current value exported.
Wherein, in the embodiment of the present application, below in conjunction with concrete example, the technical scheme in the application is introduced:
In Fig. 1,101,102 is demagnetization lead-out terminal and direct current Analysis ofremanence lead-out terminal, and 105,106 for exchanging Analysis ofremanence lead-out terminal.
After instrument start, on display module, display menu is selected, and main function is: demagnetization, direct current Analysis ofremanence, interchange Analysis ofremanence etc.
When apparatus selection uses demagnetization function, Microprocessor S3C44B0X connects K1, by 101, 102(demagnetization lead-out terminal, direct current Analysis ofremanence lead-out terminal) demagnetization is carried out to the charging of high voltage side of transformer winding, microprocessor is by the first programmable amplifier, first A/D converter, first optoisolator gathers the voltage V1 on resistance Rb, then charging current is obtained by calculating I=V1/Rb, microprocessor is by the second programmable amplifier, second A/D converter, second optoisolator gathers 101, 102(demagnetization lead-out terminal, direct current Analysis ofremanence lead-out terminal) on voltage V2, obtain the magnitude of voltage on demagnetization lead-out terminal and voltage direction.After electric current rises to necessarily (setting 100mA) value; Microprocessor S3C44B0X disconnects K1; outside Transformer Winding electric energy is by power supply direction handover module, Rb, the electric discharge of inverse electromotive force protection module, and period gathers electric current and 101,102(demagnetization lead-out terminal, the direct current Analysis ofremanence lead-out terminal of Rb simultaneously) on voltage.When continuing current flow be less than 5mA, after 10 seconds the first stage terminate.
Then power supply control microprocessor direction handover module changes the outbound course of power supply; in like manner test electric current and 101,102(demagnetization lead-out terminal, the direct current Analysis ofremanence lead-out terminal on Rb) on voltage; after electric current rises to necessarily (setting 100mA) value; Microprocessor S3C44B0X disconnects K1; outside Transformer Winding electric energy is by power supply direction handover module, Rb, the electric discharge of inverse electromotive force protection module, and period gathers electric current and 101,102(demagnetization lead-out terminal, the direct current Analysis ofremanence lead-out terminal of Rb simultaneously) on voltage.When continuing current flow be less than 5mA, after 10 seconds, subordinate phase terminates.
So repeatedly, the remanent magnetism of the transformer core that demagnetization lead-out terminal connects can just be eliminated.Voltage on test demagnetization lead-out terminal and direction are that whether the voltage of DC numerical control constant current source is correct, thus achieve the function of limit test limit self-inspection, avoids occurring erroneous judgement in order to whether correctly detecting instrument controls the action of power supply output module.
When apparatus selection uses direct current Analysis ofremanence: Microprocessor S3C44B0X connects K1, by 101,102(demagnetization lead-out terminal, direct current Analysis ofremanence lead-out terminal) high voltage side of transformer winding is charged, microprocessor is by the first programmable amplifier, first A/D converter, the first optoisolator gather the voltage V1 on resistance Rb, then charging current is obtained by calculating I=V1/Rb, hole instrument high-speed gathers the value of charging current, and is got off by microprocessor records.Microprocessor by the second programmable amplifier, the second A/D converter, the second optoisolator gather 101,102(demagnetization lead-out terminal, direct current Analysis ofremanence lead-out terminal) on voltage V2, obtain the magnitude of voltage on demagnetization lead-out terminal and voltage direction.After electric current rises to 100mA; Microprocessor S3C44B0X disconnects K1; outside Transformer Winding electric energy by power supply direction handover module, Rb, the electric discharge of inverse electromotive force protection module, electric current and 101,102(demagnetization lead-out terminal, the direct current Analysis ofremanence lead-out terminal of period high speed acquisition Rb simultaneously) on voltage.When continuing current flow be less than 5mA, after 10 seconds the first stage terminate.The current wave form values discharged under microprocessor records.
Then power supply control microprocessor direction handover module changes the outbound course of power supply; electric current and 101 in like manner on high speed test Rb, 102(demagnetization lead-out terminal, direct current Analysis ofremanence lead-out terminal) on voltage; and record; after electric current rises to 100mA; Microprocessor S3C44B0X disconnects K1; outside Transformer Winding electric energy is by power supply direction handover module, Rb, the electric discharge of inverse electromotive force protection module, and period gathers electric current and 101,102(demagnetization lead-out terminal, the direct current Analysis ofremanence lead-out terminal of Rb simultaneously) on voltage.When continuing current flow be less than 5mA, after 10 seconds, subordinate phase terminates.
By more forward and reverse duration of charging, obviously can judge whether this transformer has remanent magnetism.And show in display module, as shown in Figure 2.
When apparatus selection uses interchange Analysis ofremanence: Microprocessor S3C44B0X electric voltage regulator is slowly boosted from zero-bit, voltage doubles through isolation boosting device liter, tested Transformer Winding is exported to by alternating voltage testing current module, the electric current and voltage that in boost process, follow-on test exports, and record, after being elevated to setting voltage (different transformer setting voltages is different), the step-down of Microprocessor S3C44B0X electric voltage regulator, the electric current and voltage that in pressure reduction, follow-on test exports, and record.Shown by the current curve in display module falling-rising pressure, pressure reduction after having tested.By comparing the current curve of voltage raising and reducing, as shown in Figure 3, can judge whether tested transformer has remanent magnetism.
Wherein, in the embodiment of the present application, described microprocessor is specially: AT89C51ED2 is the microprocessor of core.
Wherein, in the embodiment of the present application, what make use of the curve of transformer forward and reverse charging electric current relatively detects remanent magnetism, is specially: wherein, and the horizontal ordinate in Fig. 2 is time shaft, and ordinate is current value.The rising part of the first half of figure is transformer positive charge current waveform, and sloping portion is discharge current waveform.The sloping portion of waveform the latter half is reverse charging current waveform, and rising part is back discharge waveform.
Wherein, in the embodiment of the present application, after positive and negative charging measurement, the current waveform of more vivid sign remanent magnetism impact is specially: if transformer does not have remanent magnetism, upper and lower two-part figure will close to symmetrical, if transformer has larger remanent magnetism, upper and lower two parts waveform will have obvious difference.Adopt the difference in just anti-phase duration of charging to judge whether transformer has remanent magnetism in this example.Adopt the positive charge time to be greater than the reverse charging time in this example and subtract 5% and be less than the reverse charging time and judge not need demagnetization when adding 5%, otherwise judge suggestion demagnetization.The standard of particular user can arrange amendment on instrument.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
Owing to have employed, transformer demagnetization analyser is designed to comprise: the first direct current Analysis ofremanence demagnetization lead-out terminal, second direct current Analysis ofremanence demagnetization lead-out terminal, described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal are connected with the first link of power supply direction handover module and the second link respectively, 3rd link of described power supply direction handover module is all connected with the first link of inverse electromotive force protection module and the first link of DC numerical control constant current source, one end that 4th link of described power supply direction handover module gathers resistance Rb with the first link of the first programmable amplifier and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb and one end of K switch 1, second link of described inverse electromotive force protection module, second link of described first programmable amplifier all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source, described first programmable amplifier is connected with the first A/D converter, described first A/D converter is connected with the first optoisolator, described first optoisolator is connected with microprocessor, the two ends of the second programmable amplifier are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal respectively, described second programmable amplifier is connected with the second A/D converter, described second A/D converter is connected with the second optoisolator, described second optoisolator is connected with described microprocessor, described microprocessor and instruction load module, display module, described DC numerical control constant current source all connect, and described microprocessor is connected with the 5th link of described power supply direction handover module, first exchanges Analysis ofremanence lead-out terminal, second exchanges Analysis ofremanence lead-out terminal, described first interchange Analysis ofremanence lead-out terminal and described second exchanges Analysis ofremanence lead-out terminal and is connected with electric current and voltage test module respectively, described electric current and voltage test module is connected with isolation boosting transformer, described isolation boosting transformer is connected with electric voltage regulator, described electric voltage regulator is connected with AC power, the technical scheme that described electric voltage regulator is all connected with described microprocessor with described electric current and voltage test module, by demagnetization function, direct current Analysis ofremanence, interchange Analysis ofremanence combines together, employ the direct current remanent magnetism detection method relatively detecting remanent magnetism of the curve of transformer forward and reverse charging electric current, can characterize more intuitively and whether there is remanent magnetism, use and exchange Analysis ofremanence lead-out terminal output AC voltage, and utilize microcontroller automatic control electric to move pressure regulator boosting and step-down, and the current waveform automatically recorded in voltage raising and reducing process, relatively rise the method whether consistent with current curve in decline process, judge whether to have remanent magnetism, the method is for exchanging Analysis ofremanence.Direct current Analysis ofremanence demagnetization lead-out terminal is utilized to carry out degaussing operation, remanent magnetism in transformer can be carried out demagnetization, utilize direct current Analysis ofremanence demagnetization lead-out terminal with exchange Analysis ofremanence lead-out terminal carry out direct current Analysis ofremanence and exchange Analysis ofremanence detect operation, the remanent magnetism content in transformer can be detected, content according to remanent magnetism carries out flexible operating, so, the equipment and instrument efficiently solving existing transformer demagnetization exists and can only carry out transformer demagnetization, the remanent magnetism amount of transformer can not be detected, and easily lead to errors judgement and operation, the technical matters of remanent magnetism is easily increased when the remanent magnetism of transformer itself is less, and then achieve transformer demagnetization analyser and can not only carry out demagnetization, the remanent magnetism amount of transformer can also be detected, erasure effect is better, the technique effect that demagnetization efficiency is higher.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (4)
1. a transformer demagnetization analyser, is characterized in that, described analyser comprises:
First direct current Analysis ofremanence demagnetization lead-out terminal, second direct current Analysis ofremanence demagnetization lead-out terminal, described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal are connected with the first link of power supply direction handover module and the second link respectively, 3rd link of described power supply direction handover module is all connected with the first link of inverse electromotive force protection module and the first link of DC numerical control constant current source, one end that 4th link of described power supply direction handover module gathers resistance Rb with the first link of the first programmable amplifier and the first optoisolator is all connected, described first optoisolator gathers the other end of resistance Rb and one end of K switch 1, second link of described inverse electromotive force protection module, second link of described first programmable amplifier all connects, the other end of described K switch 1 is connected with the second link of described DC numerical control constant current source, described first programmable amplifier is connected with the first A/D converter, described first A/D converter is connected with the first optoisolator, described first optoisolator is connected with microprocessor, the two ends of the second programmable amplifier are connected with described first direct current Analysis ofremanence demagnetization lead-out terminal and described second direct current Analysis ofremanence demagnetization lead-out terminal respectively, described second programmable amplifier is connected with the second A/D converter, described second A/D converter is connected with the second optoisolator, described second optoisolator is connected with described microprocessor, described microprocessor and instruction load module, display module, described DC numerical control constant current source all connect, and described microprocessor is connected with the 5th link of described power supply direction handover module,
First exchanges Analysis ofremanence lead-out terminal, second exchanges Analysis ofremanence lead-out terminal, described first interchange Analysis ofremanence lead-out terminal and described second exchanges Analysis ofremanence lead-out terminal and is connected with electric current and voltage test module respectively, described electric current and voltage test module is connected with isolation boosting transformer, described isolation boosting transformer is connected with electric voltage regulator, described electric voltage regulator is connected with AC power, and described electric voltage regulator is all connected with described microprocessor with described electric current and voltage test module.
2. analyser according to claim 1, is characterized in that, described power supply direction handover module is specially the module using magnetic latching relay to carry out the switching of power supply direction, ensures that, when power supply disconnects suddenly, power supply direction is operated in stable state.
3. analyser according to claim 1, is characterized in that, described inverse electromotive force protection module is specially the back electromotive force protection module based on diode reverse conducting principle, can rapid discharge.
4. analyser according to claim 1, it is characterized in that, described electric current and voltage test module specifically comprises: electrical quantity transmitter module can test the technical indicator of alternating voltage, electric current, described electrical quantity transmitter module with electric energy meter chip CS5460 for core, coordinate high-accuracy voltage, current transformer forms, and measures the alternating voltage current value exported.
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| CN201510214514.1A CN104833929A (en) | 2015-04-30 | 2015-04-30 | Transformer demagnetization analyzer |
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| CN110828101A (en) * | 2018-08-14 | 2020-02-21 | 广州供电局有限公司 | Power transformer demagnetization and remanence measurement device |
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Application publication date: 20150812 |