CN204882843U - Transformer remanence detects and demagnetization device - Google Patents

Transformer remanence detects and demagnetization device Download PDF

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Publication number
CN204882843U
CN204882843U CN201520627039.6U CN201520627039U CN204882843U CN 204882843 U CN204882843 U CN 204882843U CN 201520627039 U CN201520627039 U CN 201520627039U CN 204882843 U CN204882843 U CN 204882843U
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China
Prior art keywords
transformer
module
demagnetization
remanent magnetism
acquisition module
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CN201520627039.6U
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Chinese (zh)
Inventor
罗亮
尹德君
李建明
杨海龙
张榆
陈小平
谢东
刘勇
李荷薇
Original Assignee
国网四川省电力公司阿坝供电公司
国网四川省电力公司电力科学研究院
国家电网公司
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Abstract

The utility model discloses a transformer remanence detects and demagnetization device, including alternating current power supply module, power conversion module, DC power supply module, control collection module, frequency conversion pressure regulating unit, human -computer interaction unit, data collection module, intelligent analysis system and testing transformer. Spread into testing transformer remanence content into the intelligent analysis system through data acquisition module, by human -computer interaction unit reads, operating personnel is according to the defeated entry control instruction of remanence content, and the required low -frequency voltage of control frequency conversion pressure regulating unit output is to the testing transformer demagnetization. The utility model discloses when obtaining better erasure effect, dwindled the power capacity and the volume of demagnetization device, make the demagnetization device can satisfy the space requirement of field test condition, leading to analytic system through intelligence and transmitting the unit to human -computer interaction with the real -time remanence surplus of transformer, the magnetic treatment process that disappears can accurate, audio -visually be learnt to operating personnel to with the corresponding control command of this input, in order to reach final thorough demagnetization to testing transformer.

Description

A kind of transformer remanent magnetism detects and degaussing gear

Technical field

The utility model relates to electrical equipment technical field, relates to a kind of transformer remanent magnetism particularly and detects and degaussing gear.

Background technology

Along with the fast development of national economy, electric system scale constantly expands, and has higher requirement to the safe reliability of power equipment.Power transformer, as " heart " of whole electrical network, is the key equipment of safe and stable operation in electric system.

All direct current resistance can be measured after transformer handing-over at the scene, overhaul and fault, and during the test of high-power transformer winding D.C. resistance, due to transformer capacity and inductance value is large, little its time constant that makes of equivalent resistance becomes large, therefore direct current resistance process of the test needs long time.The siliconized plate magnetic induction density B that electrical transformer cores uses not is and magnetic field intensity H one_to_one corresponding, and relevant with experienced magnetic state.Magnetic flux in transformer magnetic circuit is constant, need force to pass into very large galvanic current stream to shorten the test duration, and this makes siliconized plate produce paramagnetic field effect, in transformer, produce remanent magnetism.

For a long time, transformer core remanent magnetism normally runs transformer and has protected tremendous influence, often occurs that excitation surge current phenomenon causes protective relaying maloperation to do, thus causes trip phenomenon in switching process; In addition magnetic saturation can make to occur a large amount of harmonic wave in exciting current, and generation ofharmonic can cause serious pollution to the electrical network quality of power supply, makes the increase of transformer reactive loss, the lost of life.

In sum, remanent magnetism has become the potential factor of transformer irregular operation, and transformer remanent magnetism is once produce, and can not automatically disappear, and it incites somebody to action long-term existence under normal circumstances, so we should manage to carry out detecting to the remanent magnetism of transformer and eliminate.Present stage, the method for mature and reliable is not also had accurately to detect transformer core remanent magnetism at home and abroad.The method used both at home and abroad at present mainly contains AC erasing method and dc erasing method, and in test, AC erasing method is AC power plant due to what adopt at the scene, and equipment heaviness is not easy to transport, and AC erasing method accurately cannot judge the net result of demagnetization.And dc erasing method is difficult to time and the demagnetization program of the forward and reverse dc-decay gear of optimized control, causing can not thoroughly demagnetization.These two kinds of methods are all the net results probably judging demagnetization, and the size of remanent magnetism is not considered from remanent magnetism detection angles, thus accurately cannot conclude the net result of transformer demagnetization, therefore be necessary that design is a kind of accurately to detect the final size of remanent magnetism and be convenient to the on-the-spot degaussing gear transported, namely remanent magnetism detects and low frequency demagnetization integrated device.

Summary of the invention

For above-mentioned prior art Problems existing, the utility model provides a kind of transformer remanent magnetism to detect and degaussing gear, this device can accurately judge demagnetization net result, and reach the object of thorough demagnetization, testing ground space condition and passage can be met again to equipment volume and the unsuitable excessive requirement of power supply capacity.

The purpose of this utility model is achieved through the following technical solutions:

A kind of transformer remanent magnetism detects and degaussing gear, comprises AC power supply module, power transfer module, DC power supplier, control acquisition module, frequency conversion voltage adjusting unit, man-machine interaction unit, data acquisition module, intelligent analysis system and testing transformer;

Described AC power supply module is described DC power supplier by power transfer module, frequency conversion voltage adjusting unit, man-machine interaction unit and intelligent analysis system are powered, described DC power supplier is that described control acquisition module and data acquisition unit are powered, man-machine interaction unit output terminal is connected with control acquisition module input end, control acquisition module output terminal to be connected with frequency conversion voltage adjusting unit input end, frequency conversion voltage adjusting unit output terminal is connected with the armature winding input end of testing transformer, data acquisition module input end is connected with testing transformer armature winding output terminal, data acquisition module output terminal is connected with intelligent analysis system input end, intelligent analysis system output terminal is connected with man-machine interaction unit input end.

The elimination of remanent magnetism and frequency relation are little, and closely related with magnetic induction density B.In site test, siliconized plate remanent magnetism is generally between 0.75-1.4T, and transformer magnetic induction density B when normally running 1at about 1.7T, degaussing successful when the magnetic induction density when transformer runs is greater than remanent magnetism amount, but these needs are issued to rated voltage in power frequency.According to exciting current formula I=U/WL, when the less W of frequency f is less, reach demagnetization test needed for exciting current time voltage less, required power supply capacity is also less, therefore reduction frequency small power supply capacity Deperming Facility can be utilized to obtain the erasure effect same with high frequency.

When carrying out the detection of transformer remanent magnetism and testing with demagnetization, the remanent magnetism amount of testing transformer imports intelligent analysis system into through data acquisition module, operating personnel can in the testing transformer remanent magnetism amount of man-machine interaction unit reading from intelligence reduction of fractions to a common denominator analysis system, and according to this remanent magnetism amount at man-machine interaction unit input control order, this steering order continuously adjustabe within the specific limits, steering order is converted to electric signal through controlling acquisition module and imports frequency conversion voltage adjusting unit into, control frequency conversion voltage adjusting unit and export low-frequency voltage needed for demagnetization, thus demagnetization is carried out to testing transformer.In process of the test, intelligent analysis system is constantly by the remanent magnetism surplus of data collecting module collected testing transformer, and analysis result is sent to human-computer interaction interface, operating personnel read remanent magnetism surplus by human-computer interaction interface, and judge whether demagnetization completes, when demagnetization surplus reaches to desired value, end of input demagnetization steering order, demagnetization test is complete.

The utility model carries out demagnetization by controlling frequency conversion voltage adjusting unit output AC low frequency, reduce volume and power supply capacity that demagnetization tries difficult equipment, and by the remanent magnetism surplus of intelligent analysis system and the real-time detection experiment transformer of man-machine interface, thus accurately can judge the remanent magnetism surplus of testing transformer, and finally realize the object of the thorough demagnetization of transformer.

Further, described frequency conversion voltage adjusting unit comprises main circuit and control circuit, and described main circuit comprises power regulator and electric power frequency modulator, and described control circuit comprises measure voltage & current passage and frequency detecting passage.By main circuit for electric power frequency modulator provides supply voltage, control circuit receives and controls steering order that acquisition module transmits and the output voltage and the frequency that control frequency conversion voltage adjusting unit according to steering order, make the low-frequency ac demand met needed for site test, guarantee use small volume, the degaussing gear that power supply capacity is less well can carry out demagnetization test.

Further, described measure voltage & current passage comprises voltage sample loop and current sampling circuit, and described voltage sample loop and current sampling circuit include operational amplifier, two optically-coupled and single-chip microcomputer.By voltage sample loop and current sampling circuit detect transformation FM module export voltage and frequency whether meet demagnetization testing requirements, utilize operational amplifier and two optically-coupled by sampling gained electric current and voltage stabilization, equal proportion import Chip Microcomputer A/D sampling channel into, and because of the electrical isolation characteristic of optically-coupled, the signal importing single-chip microcomputer into is disturbed less, improve the accuracy of current/voltage sense channel, thus ensure that the voltage that frequency conversion voltage adjusting unit exports and frequency can meet the demand of demagnetization test more accurately.

Further, described intelligent analysis system comprises real-time parameter database, and described real-time parameter database comprises the secondary harmonic component of the testing transformer primary winding current from described data acquisition module, waveform side-play amount and residual flux content.The existence of transformer remanent magnetism can make its flux curve offset, thus affect exciting current generation second harmonic, secondary harmonic component makes the positive half period of exciting current become peaked wave, positive and negative half period current waveform is not in symmetry, and remanent magnetism content is larger, exciting current distortion is more serious, therefore transformer remanent magnetism content can accurately be judged from secondary harmonic component and waveform side-play amount, and input control order accordingly, control output voltage and the frequency of frequency conversion voltage adjusting unit, thus realize the thorough demagnetization of transformer.

Further, described man-machine interaction unit comprises interface module, display module and Keysheet module.Real-time for transformer remanent magnetism content is inputted man-machine interaction unit by interface module by intelligent analysis system, this real-time remanent magnetism content is read for operating personnel intuitively, timely by display module, operating personnel by Keysheet module input control order, thus control output voltage and the frequency of frequency conversion voltage adjusting unit according to the real-time remanent magnetism content of read transformer.In whole demagnetization process of the test, operating personnel can cross man-machine interaction list without accurately, directly perceived, example prompt demagnetization process is carried out to transformer, finally reach the object of the thorough demagnetization of transformer.

The beneficial effects of the utility model:

The utility model exchanges by controlling frequency conversion voltage adjusting unit output low frequency, demagnetization process is carried out to testing transformer, while obtaining better erasure effect, reduces power supply capacity and the volume of degaussing gear, make degaussing gear can meet the space requirement of site test condition, and be convenient to on-the-spot mobile; By intelligence reduction of fractions to a common denominator analysis system, real-time for transformer remanent magnetism surplus is passed to man-machine interaction unit, operating personnel can know demagnetization treatment progress accurately, intuitively, and input corresponding steering order with this, to reach the final thorough demagnetization process to testing transformer.

Accompanying drawing explanation

Accompanying drawing 1 is the structured flowchart of a kind of embodiment of the utility model;

Accompanying drawing 2 is that the waveform skew of a kind of embodiment of the utility model measures remanent magnetism schematic diagram;

Accompanying drawing 3 is the circuit structure schematic diagram of frequency conversion voltage adjusting unit in a kind of embodiment of the utility model;

Accompanying drawing 4 is voltage sampling circuit in a kind of embodiment of the utility model;

Accompanying drawing 5 is current sampling circuit in a kind of embodiment of the utility model;

Accompanying drawing 6 is that in a kind of embodiment of the utility model, transformer remanent magnetism detects and degaussing gear and testing transformer wiring diagram.

Embodiment

Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.

Embodiment 1:

As shown in Figure 1, a kind of transformer remanent magnetism detects and degaussing gear, comprises AC power supply module, power transfer module, DC power supplier, control acquisition module, frequency conversion voltage adjusting unit, man-machine interaction unit, data acquisition module, intelligent analysis system and testing transformer;

Described AC power supply module is described DC power supplier by power transfer module, frequency conversion voltage adjusting unit, man-machine interaction unit and intelligent analysis system are powered, described DC power supplier is that described control acquisition module and data acquisition unit are powered, man-machine interaction unit output terminal is connected with control acquisition module input end, control acquisition module output terminal to be connected with frequency conversion voltage adjusting unit input end, frequency conversion voltage adjusting unit output terminal is connected with the armature winding input end of testing transformer, data acquisition module input end is connected with testing transformer armature winding output terminal, data acquisition module output terminal is connected with intelligent analysis system input end, intelligent analysis system output terminal is connected with man-machine interaction unit input end.

The elimination of remanent magnetism and frequency relation are little, and closely related with magnetic induction density B, U 1≈ 4.44fN 1Φ m=4.44fN 1b 1s, Transformer Winding number of turn N in transformer 1be certain value, can not change.B 1for the magnetic induction density of transformer actual motion, in site test, siliconized plate remanent magnetism is generally between 0.75-1.4T, and transformer magnetic induction density B when normally running 1at about 1.7T, degaussing successful when magnetic induction density when it runs is greater than remanent magnetism amount, these needs are issued to rated voltage in power frequency.But because of the restriction of site test condition, reach testing equipment capacity needed for rated voltage too large, convenient, flexible requirement cannot be met.Again according to exciting current formula I=U/WL, when the less W of frequency f is less, reach test need exciting current time voltage also less.Therefore, the effect that frequency also can obtain the same demagnetization of high frequency is reduced.

Be described for 220kV/35kV transformer below.High voltage side of transformer short circuit, low-pressure side is pressurizeed, and its short-circuit impedance is 12.96%, and load loss is 285KW, and high-pressure side rated current is 251A, and low-pressure side rated current is 1649.6A.Exciting current is 0.2% of rated current, and low-pressure side exciting current is I 0=1649.6*0.2%=3.3A, resistive component R tcalculating gained with reactive component X through following formula is:

Then under power frequency 50HZ, making alive is needed to be for reaching exciting current: .Again according to formula U 1=4.44fN 1b 1s, known U 2/ f 2=U 1/ f 1, therefore under 1HZ, required voltage U 2=U 1* f 2/ f 1=5.25*1/50=0.105V.Power supply capacity required under power frequency is, S 1=5.25*3.3=17.33VA, power supply capacity required under 1HZ is S 2=0.105*3.3=0.35VA, then the volume ratio power frequency needed for 1HZ reduces 50 times, can reduction equipment volume greatly, make this degaussing gear can in testing ground flexibly, be convenient to use.

As shown in Fig. 3, Fig. 4, Fig. 5, above-mentioned frequency conversion voltage adjusting unit comprises main circuit and control circuit, and described main circuit comprises power regulator and electric power frequency modulator, and described control circuit comprises measure voltage & current passage and frequency detecting passage.Described measure voltage & current passage comprises voltage sample loop and current sampling circuit.

By main circuit for electric power frequency modulator provides supply voltage, control circuit receives and controls steering order that acquisition module transmits and the output voltage and the frequency that control frequency conversion voltage adjusting unit according to steering order, make the low-frequency ac demand met needed for site test, guarantee use small volume, the degaussing gear that power supply capacity is less well can carry out demagnetization test.

By above-mentioned voltage sample loop; realize the collection to voltage waveform parameters; the voltage signal fetched from divider resistance is after filtering; sampled by single-chip microcomputer; analog voltage amount sampled signal being converted into 0V ~ 5V gives the A/D sampling channel of single-chip microcomputer, makes monolithic function collect voltage at that time, so as to carry out voltage stabilizing, current stabilization or pressure limiting, current limliting regulate; for analysis, the process of control algolithm, realize the functions such as control, protection, waveform display and foundation is provided.Input voltage: V=U o(+)-U o(-) becomes V through decay i, , to break amplifier not Absorption Current according to void, V 3=V i; According to the short principle of the void of amplifier, there is V 3=V 2, then , owing to should will isolate the signal of input, give single-chip microcomputer by its equal proportion again, the general function adopting common optical coupler conjunction and amplifier to realize linear optical coupling.U 1, U 2middle optocoupler manufacturing process is identical, can think that their current discharges (greatly) multiple is identical approx.I.e. I 1/ I 3=I 2/ I 3because the input resistance of A/D is very high, so , regulate RW 1the input voltage V that makes of value inthe A/D converter meeting single-chip microcomputer, to the requirement of additional control, is sampled for single-chip microcomputer.

Current sampling circuit, realizes the collection to current waveform parameter, and its principle of work is substantially identical with the principle of voltage acquisition, and difference mainly surveys electric current in employing resistance in series, adopts operational amplifier to be amplified.According to the principle of work of amplifier, the multiple of amplification is R 4/ R 2, make V iin the scope of control overflow, common optical coupler conjunction and amplifier is adopted to realize linear optical coupling function.V iput the voltage relative to AGND and AC 1point voltage is similar relative to the voltage relationship of AGND, herein by being isolated by input current, regulates RW 1make voltage meet the voltage requirements of single-chip microcomputer, sample for single-chip microcomputer.

As shown in Figure 1 and Figure 2, above-mentioned intelligent analysis system comprises real-time parameter database, and described real-time parameter database comprises the secondary harmonic component of the testing transformer primary winding current from described data acquisition module, waveform side-play amount and residual flux content.Erasure effect is detected by the size of waveform side-play amount, under normal running (operation) conditions, transformer main flux Φ runs on the range of linearity in Fig. 2 (b), the positive and negative half-wave symmetry of voltage waveform, current waveform, flux curve in transformer, exciting current are respectively as shown in Fig. 2 (a) He (c) solid line, but, due to transformer remanent magnetism Φ 0existence, flux curve is displaced to dotted line position.Flux curve is once change, iron core magnetic flux density increases, core portion magnetic flux can in the state of saturation work of iron core, core sataration then can affect exciting current, second harmonic component will be produced in exciting current, second harmonic component makes the positive half cycle of exciting current become peaked wave, positive-negative half-cycle ripple will be no longer symmetrical, and the amplitude of peaked wave is directly proportional to the size of remanent magnetism, the more exciting current distortion of remanent magnetism will be more serious, the half cycle magnetic flux consistent with remanence direction will increase greatly, the magnetic flux of other half cycle will reduce, when having remanent magnetism there is skew as indicated by the dashed lines in exciting current.After demagnetization, side-play amount, secondary harmonic component all can significantly decline, voltage and current waveform gets back to the solid line position of normal operation, waveform do not occur skew and waveform positive half-wave and negative half-wave symmetrical up and down, in voltage rise and decline process, exciting current value under same voltage is identical, from described man-machine interaction unit can see waveform change and and harmonic content change, thus judge that remanent magnetism is how many fast and accurately.If exciting current dashed peaks is I 1, solid line peak value is I 2, then offset effect is I 1-I 2, erasure effect is (I 1-I 2)/I 1* 100%.Therefore, transformer remanent magnetism content accurately can be judged from secondary harmonic component and waveform side-play amount, and input control order accordingly, control output voltage and the frequency of frequency conversion voltage adjusting unit, thus realize the thorough demagnetization of transformer.

Figure 6 shows that the utility model carries out demagnetization to the transformer after maintenance, for jumbo equipment electrical wiring as shown in the figure, transformer remanent magnetism detects and the pressure regulator of degaussing gear is connected with frequency converter, the electric current of its input is changed to direct current by pressure regulator and bridge rectifier circuit, filtering circuit inductance and capacitor filtering, Converting Unit adopts four IGBT pipe compositions, adopt bipolar modulation mode, export through the filtering of LC low-pass filter, filtering higher hamonic wave, obtain the alternating current of voltage and frequency-adjustable, low-frequency current is passed into the first winding of on-the-spot transformer to be tested, and by the Secondary Winding short circuit of testing transformer, and measurement port voltage waveform and current waveform appear on degaussing instruments.In demagnetization and remanent magnetism testing process, do not need thread-changing, test is convenient.Show that this integrated device remanent magnetism measuring ability accurately can judge remanent magnetism content and can eliminate remanent magnetism up hill and dale by site test, effectively eliminate the adverse effect that remanent magnetism brings to the protective device of transformer and primary equipment, erasure effect is desirable.

In addition, above-mentioned man-machine interaction unit is provided with interface module, display module and Keysheet module.Real-time for transformer remanent magnetism content is inputted man-machine interaction unit by interface module by intelligent analysis system, this real-time remanent magnetism content is read for operating personnel intuitively, timely by display module, operating personnel by Keysheet module input control order, thus control output voltage and the frequency of frequency conversion voltage adjusting unit according to the real-time remanent magnetism content of read transformer.In whole demagnetization process of the test, operating personnel can cross man-machine interaction list without accurately, directly perceived, example prompt demagnetization process is carried out to transformer, finally reach the object of the thorough demagnetization of transformer.

As mentioned above, then well the utility model can be realized.

Claims (5)

1. transformer remanent magnetism detects and a degaussing gear, it is characterized in that: comprise AC power supply module, power transfer module, DC power supplier, control acquisition module, frequency conversion voltage adjusting unit, man-machine interaction unit, data acquisition module, intelligent analysis system and testing transformer;
Described AC power supply module is described DC power supplier by power transfer module, frequency conversion voltage adjusting unit, man-machine interaction unit and intelligent analysis system are powered, described DC power supplier is that described control acquisition module and data acquisition unit are powered, man-machine interaction unit output terminal is connected with control acquisition module input end, control acquisition module output terminal to be connected with frequency conversion voltage adjusting unit input end, frequency conversion voltage adjusting unit output terminal is connected with the armature winding input end of testing transformer, data acquisition module input end is connected with testing transformer armature winding output terminal, data acquisition module output terminal is connected with intelligent analysis system input end, intelligent analysis system output terminal is connected with man-machine interaction unit input end.
2. transformer remanent magnetism according to claim 1 detects and degaussing gear, it is characterized in that: described frequency conversion voltage adjusting unit comprises main circuit and control circuit, described main circuit comprises power regulator and electric power frequency modulator, and described control circuit comprises measure voltage & current passage and frequency detecting passage.
3. transformer remanent magnetism according to claim 2 detects and degaussing gear, it is characterized in that: described measure voltage & current passage comprises voltage sample loop and current sampling circuit, described voltage sample loop and current sampling circuit include operational amplifier, two optically-coupled and single-chip microcomputer.
4. transformer remanent magnetism according to claim 1 detects and degaussing gear, it is characterized in that: described intelligent analysis system comprises real-time parameter database, described real-time parameter database comprises the secondary harmonic component of the testing transformer primary winding current from described data acquisition module, waveform side-play amount and residual flux content.
5. the transformer remanent magnetism according to any one of Claims 1 to 4 detects and degaussing gear, it is characterized in that: described man-machine interaction unit comprises interface module, display module and Keysheet module.
CN201520627039.6U 2015-08-19 2015-08-19 Transformer remanence detects and demagnetization device CN204882843U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093140A (en) * 2015-08-19 2015-11-25 国网四川省电力公司阿坝供电公司 Transformer remanence detection and demagnetization method and device
CN106093811A (en) * 2016-06-01 2016-11-09 国网河北省电力公司电力科学研究院 A kind of transformer core remanent magnetism detection method based on method of least square
CN106252024A (en) * 2016-09-05 2016-12-21 山东电力设备有限公司 A kind of system of demagnetization the most unloaded to multiple stage transformator
CN106291407A (en) * 2016-08-01 2017-01-04 国网河北省电力公司电力科学研究院 A kind of transformator remanent magnetism detection, elimination integrated apparatus and using method thereof
CN106873461A (en) * 2017-03-02 2017-06-20 国家电网公司 A kind of control method of remanence of current transformer degaussing gear
CN108107384A (en) * 2017-12-18 2018-06-01 国网新疆电力公司检修公司 750kV auto-transformers directly hinder remanent magnetism amount computational methods after experiment
CN109358298A (en) * 2018-08-22 2019-02-19 国网天津市电力公司电力科学研究院 Demagnetization instrument calibration equipment

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093140A (en) * 2015-08-19 2015-11-25 国网四川省电力公司阿坝供电公司 Transformer remanence detection and demagnetization method and device
CN105093140B (en) * 2015-08-19 2018-03-20 国网四川省电力公司阿坝供电公司 A kind of method and its device of the detection of transformer remanent magnetism and demagnetization
CN106093811A (en) * 2016-06-01 2016-11-09 国网河北省电力公司电力科学研究院 A kind of transformer core remanent magnetism detection method based on method of least square
CN106093811B (en) * 2016-06-01 2018-10-19 国网河北省电力公司电力科学研究院 A kind of transformer core remanent magnetism detection method based on least square method
CN106291407A (en) * 2016-08-01 2017-01-04 国网河北省电力公司电力科学研究院 A kind of transformator remanent magnetism detection, elimination integrated apparatus and using method thereof
CN106291407B (en) * 2016-08-01 2019-03-22 国网河北省电力公司电力科学研究院 A kind of transformer remanent magnetism detects, eliminates the application method of integrated apparatus
CN106252024B (en) * 2016-09-05 2018-08-07 山东电力设备有限公司 A kind of system to the unloaded demagnetization simultaneously of more transformers
CN106252024A (en) * 2016-09-05 2016-12-21 山东电力设备有限公司 A kind of system of demagnetization the most unloaded to multiple stage transformator
CN106873461A (en) * 2017-03-02 2017-06-20 国家电网公司 A kind of control method of remanence of current transformer degaussing gear
CN108107384A (en) * 2017-12-18 2018-06-01 国网新疆电力公司检修公司 750kV auto-transformers directly hinder remanent magnetism amount computational methods after experiment
CN109358298A (en) * 2018-08-22 2019-02-19 国网天津市电力公司电力科学研究院 Demagnetization instrument calibration equipment
CN109358298B (en) * 2018-08-22 2020-09-29 国网天津市电力公司电力科学研究院 Degaussing instrument calibration device

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