CN110828101A - Power transformer demagnetization and remanence measurement device - Google Patents
Power transformer demagnetization and remanence measurement device Download PDFInfo
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- CN110828101A CN110828101A CN201810924608.1A CN201810924608A CN110828101A CN 110828101 A CN110828101 A CN 110828101A CN 201810924608 A CN201810924608 A CN 201810924608A CN 110828101 A CN110828101 A CN 110828101A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
Abstract
The invention relates to a device for demagnetizing and measuring remanence of a power transformer, which comprises a demagnetizing structure used for demagnetizing by adopting a direct-current attenuation and commutation mode, a remanence measuring structure used for quantifying remanence by collecting second harmonic in exciting current and a controller respectively connected with the demagnetizing structure and the remanence measuring structure. The device for demagnetizing the power transformer and measuring the remanence can reduce or even eliminate the remanence of the power transformer on one hand, and can effectively measure the remanence of the iron core of the power transformer before, during and after demagnetization on the other hand, so as to accurately reflect the remanence; the device has the characteristics of simple operation, high demagnetization speed, obvious demagnetization effect, accurate and quick residual magnetism quantity test and the like.
Description
Technical Field
The invention relates to a device for eliminating residual magnetism of a power transformer, in particular to a device for demagnetizing and measuring the residual magnetism of the power transformer.
Background
The power transformer is one of important elements constituting a power grid, and plays an extremely important role in safe and stable operation of the power grid. Residual magnetism remains in the transformer core after the operations of transformation ratio test, direct current resistance test, no-load test and the like are carried out on the power transformer. When the transformer is put into operation, the residual magnetism of the iron core saturates the half cycle of the iron core of the transformer, and a large amount of harmonic waves are generated in the exciting current. This not only increases the reactive loss of the transformer, but also may cause malfunction of the relay protection device, resulting in a certain economic loss. In addition, the high saturation of the iron core also increases magnetic flux leakage, which causes overheating of the metal structural member and the oil tank, and the local overheating degrades the insulation paper of the winding coil and decomposes the oil of the transformer, thereby affecting the life of the transformer. For the above reasons, it is necessary to measure the residual magnetism of the transformer and take effective measures to eliminate or reduce the residual magnetism of the iron core when the transformer is in operation or before the transformer is put into operation, which is important for protecting the normal operation of the transformer and maintaining the stability and safety of the power system.
The method for demagnetizing the iron core of the power transformer comprises the following steps: 1. AC demagnetization, namely, the transformer is charged in a no-load way by using AC voltage of which the voltage grade is less than the rated voltage grade of the transformer, and the method is only suitable for common transformers of a substation; 2. the temperature is increased for demagnetization, namely the environmental temperature of the transformer iron core is increased, the molecular thermal motion of the iron core material is accelerated, and the orderly arranged magnetic poles become disordered, so that the purpose of demagnetization is achieved, but the method is difficult to realize on site; 3. and D, direct current demagnetization, namely, direct current is led into the two ends of the high-voltage winding of the transformer in the forward and reverse directions and is gradually reduced to reduce the hysteresis loop of the iron core, so that the demagnetization effect is achieved.
In addition, no clear and effective method for measuring the remanence exists in China. The main theoretical methods are the following two: 1. the no-load experiment is carried out on the voltage transformation, the volt-ampere curve in the voltage rising stage and the volt-ampere curve in the voltage falling stage are recorded, then the slopes of the two curves at a plurality of same voltage sampling points are respectively calculated, the slopes are summed and then averaged, the ratio coefficient of the averages of the slopes of the two curves is obtained, and comparison is carried out according to the coefficient. The method verifies whether the residual magnetism quantity before and after demagnetization is reduced by a comparison method, and does not quantify the residual magnetism. 2. The residual magnetic quantity is quantified by detecting the magnitude of two harmonic components in the exciting current at the moment of low-voltage switching-on of the transformer, and the method has the defects that the method is greatly influenced by the phase angle of the voltage during switching-on, and the voltage phase angle of the switching-on needs to be effectively controlled in the actual measurement process.
Disclosure of Invention
Based on this, it is necessary to provide a device for demagnetizing and measuring remanence of power transformer.
A device for demagnetizing and measuring remanence of a power transformer comprises a demagnetizing structure used for demagnetizing by adopting a direct current attenuation and commutation mode, a remanence measuring structure used for quantifying remanence by collecting second harmonic in exciting current, and a controller respectively connected with the demagnetizing structure and the remanence measuring structure.
The device for demagnetizing the power transformer and measuring the remanence can reduce or even eliminate the remanence of the power transformer on one hand, and can effectively measure the remanence of the iron core of the power transformer before, during and after demagnetization on the other hand, so as to accurately reflect the remanence; the device has the characteristics of simple operation, high demagnetization speed, obvious demagnetization effect, accurate and quick residual magnetism quantity test and the like.
In one embodiment, the degaussing structure comprises a current commutation module for switching the direction of the applied current to achieve a dc decaying commutation.
In one embodiment, the degaussing structure further comprises a current amplitude adjusting module, and the current amplitude adjusting module is used for controlling and adjusting the time and the size of the output current.
In one embodiment, the demagnetization structure further comprises an AD acquisition module, and the AD acquisition module is used for detecting a demagnetization current in a demagnetization process.
In one embodiment, the demagnetization structure further comprises a discharge protection module, wherein the discharge protection module is used for protecting the output and preventing counter-potential generated by a winding of the power transformer from damaging the device at the moment of current change.
In one embodiment, the demagnetization structure further comprises a constant current switching power supply module, and the constant current switching power supply module is used for providing stable and adjustable direct current.
In one embodiment, the constant current switch power supply is a voltage-controlled constant current source module.
In one embodiment, the residual magnetism measurement structure comprises an acquisition module and a metering module, wherein the acquisition module is used for acquiring a second harmonic in an excitation current, the metering module is connected with the acquisition module, and the metering module is used for calculating residual magnetism according to the acquisition result of the acquisition module.
In one embodiment, the metering module comprises a signal sampling processing module, and the signal sampling processing module is used for extracting a 100Hz signal and amplifying the 100Hz signal.
In one embodiment, the residual magnetism measuring structure further comprises an electric voltage regulator and a voltage output control module; the electric voltage regulator is used for generating a set output voltage under the driving of the voltage output control module to serve as an excitation voltage; the voltage output control module is used for adjusting the output voltage and controlling the acquisition module to acquire a peak value point of the voltage so as to ensure that the output voltage is applied to two ends of the power transformer winding at the voltage peak value point.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a current commutation module according to another embodiment of the invention.
Fig. 3 is a schematic diagram of a current amplitude adjusting module according to another embodiment of the invention.
Fig. 4 is a schematic diagram of an AD acquisition module according to another embodiment of the invention.
Fig. 5 is a schematic diagram of a discharge protection module according to another embodiment of the invention.
Fig. 6 is a schematic diagram of a signal sampling processing module according to another embodiment of the invention.
Fig. 7 is a schematic diagram of an electric voltage regulator according to another embodiment of the present invention.
Fig. 8 is a schematic diagram of a voltage output control module according to another embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention discloses a device for demagnetizing and measuring remanence of a power transformer, which comprises a demagnetizing structure used for demagnetizing by adopting a direct-current attenuation and commutation mode, a remanence measuring structure used for quantifying remanence by collecting second harmonic in exciting current and a controller respectively connected with the demagnetizing structure and the remanence measuring structure. The device for demagnetizing the power transformer and measuring the remanence can reduce or even eliminate the remanence of the power transformer on one hand, and can effectively measure the remanence of the iron core of the power transformer before, during and after demagnetization on the other hand, so as to accurately reflect the remanence; the device has the characteristics of simple operation, high demagnetization speed, obvious demagnetization effect, accurate and quick residual magnetism quantity test and the like.
The invention relates to a device for demagnetizing and measuring remanence of a power transformer, which mainly comprises a demagnetizing part and a remanence measuring part and is controlled by matching with a controller; or the controller is used as one part of the demagnetizing part or the residual magnetism measuring part, and the main purpose is to eliminate or reduce the residual magnetism of the power transformer, and effectively measure the residual magnetism of the iron core, so as to accurately reflect the residual magnetism.
In one embodiment, the controller is a Digital Potentiometer (also known as a digitally controlled programmable resistor); in one embodiment, the demagnetization structure comprises a current commutation module, the current commutation module is connected with the controller, and the current commutation module is used for switching the direction of applied current to realize direct current attenuation commutation. In one embodiment, as shown in fig. 2, the current commutation module is provided with two relays, wherein the first relay K1 passes through a single-pole double-throw switch to enable the current output terminal Iout + to gate the positive current input terminal I + or the negative current input terminal I +, the second relay K2 passes through a single-pole double-throw switch to enable the current output terminal Iout-to gate the positive current input terminal I + or the negative current input terminal I-, when the first relay K1 and the second relay K2 are powered simultaneously, the current output terminal Iout + and the current output terminal Iout-output forward currents, and when the first relay K1 and the second relay K2 are powered-off and return simultaneously, the current output terminal Iout + and the current output terminal Iout-output reverse currents, so that the direct current attenuation commutation is realized by switching the direction of applied currents. In one embodiment, P13 and P14 are pins of a digital potentiometer. In one embodiment, the first relay K1 and the second relay K2 are single-pole double-throw relays, respectively. In one embodiment, the demagnetizing structure further comprises a current amplitude adjusting module, the current amplitude adjusting module is connected with the controller, and the current amplitude adjusting module is used for controlling and adjusting the time and the size of the output current; in one embodiment, as shown in fig. 3, the current amplitude adjusting module is provided with a digital potentiometer and an optical coupler, and the digital potentiometer cooperates with the optical coupler to adjust the time and the magnitude of the output current by controlling; the current amplitude adjusting module is connected with pins P10, P11 and P12 of the controller, in one embodiment, a high-precision digital potentiometer X9C103 is further adopted, one end of the resistor of the digital potentiometer is connected with a power supply anode VCC1, the other end of the resistor of the digital potentiometer is connected with a power supply cathode GND, a tap position of the resistor of the digital potentiometer is connected with a voltage input end Ui of the voltage-controlled constant current source module, and the current amplitude is adjusted by adjusting the size of the Ui, so that the time and the size of the output current are controlled and adjusted. In one embodiment, the demagnetizing structure further comprises an AD acquisition module, the AD acquisition module is connected with the controller, and the AD acquisition module is used for detecting a demagnetizing current in a demagnetizing process; in one embodiment, the AD acquisition module is provided with a sampling resistor connected in series to the output loop and an analog-to-digital converter connected to the sampling resistor and acquiring a voltage signal thereof, and is used for detecting a demagnetizing current during a demagnetizing process. In one embodiment, as shown in fig. 4, in the AD acquisition module, R9 is a sampling resistor connected in series to an output loop, a loop current generates a voltage on the sampling resistor R9, the voltage is converted into a digital signal through an AD converter AD7705, the digital signal is sent to a P17 pin of a controller through a 13 th pin of the AD7705 by an optical coupler 6N137, and then the digital signal is converted into a real-time current value in the loop after operation by the controller, so that detection of a demagnetizing current in a demagnetizing process is realized. In one embodiment, the demagnetization structure further comprises a discharge protection module, wherein the discharge protection module is connected with the controller and is used for protecting output and preventing counter potential generated by a winding of the power transformer from damaging the device at the moment of current change; in one embodiment, the discharge protection module is provided with two groups of RC circuits in series between a current output positive electrode interface and a current output negative electrode interface, each group of RC circuits comprises a capacitor and a resistor connected in series, the current output positive electrode interface is connected with the capacitor, and the current output negative electrode interface is connected with the resistor; in one embodiment, as shown in fig. 5, the capacitor C1, the resistor R1, the capacitor C2, and the resistor R2 filter the internal output and divide the external counter potential, so that the current applied to the coil is more stable due to the filtering, the MOS transistor Q1 is turned on due to the dividing of the external counter potential, and the external counter potential consumes energy through R5 and R6 in the right loop to achieve the discharging purpose, thereby protecting the output and preventing the counter potential generated by the power transformer winding from damaging the device at the moment of current change. The design has a perfect back electromotive force protection circuit, and can avoid the damage to equipment in the degaussing process.
In one embodiment, the demagnetization structure further comprises a constant current switching power supply module, and the constant current switching power supply module is used for providing stable and adjustable direct current. In one embodiment, the constant current switch power supply is a voltage-controlled constant current source module. The constant current switch power supply or the voltage-controlled constant current source module mainly has the function of providing stable and adjustable direct current for a system, and the direct current is applied to two ends of a coil (namely a winding) of the power transformer through the control regulation of other modules.
Further, in one embodiment, the demagnetization structure comprises a voltage-controlled constant current source module, a current amplitude adjusting module, a current reversing module, an AD collecting module and a discharge protection module; the current amplitude adjusting module, the current reversing module and the discharge protection module are respectively connected with the voltage-controlled constant current source module, and the voltage-controlled constant current source module is also connected with the AD acquisition module. The voltage-controlled constant current source module is used for providing stable and adjustable direct current for the power system, and the direct current is applied to two ends of a coil of the power transformer after being controlled and adjusted by the current amplitude adjusting module, the current reversing module and the like; the current amplitude adjusting module is used for controlling and adjusting the time and the size of output current to achieve the effects of attenuation of applied current and gradual coverage of residual magnetism; the current reversing module is used for switching the direction of applied current, so that the direction of the magnetic pole established at the moment of current change is opposite to the direction of the original magnetic pole, and the aim of eliminating or continuously reducing is fulfilled; the AD acquisition module is used for detecting the demagnetizing current in the process; the discharge protection module is used for protecting output and preventing counter potential generated by a power transformer winding from damaging the device at the moment of current change. The examples are analogized in the same way. Therefore, the demagnetization function is realized by adopting the DC commutation attenuation principle, the charging time of the transformer coil is short, the demagnetization speed is high, and the demagnetization effect is obvious.
In one embodiment, the residual magnetism measurement structure comprises an acquisition module and a metering module, wherein the acquisition module is used for acquiring a second harmonic in an excitation current, the metering module is connected with the acquisition module, and the metering module is used for calculating residual magnetism according to the acquisition result of the acquisition module. In one embodiment, the metering module comprises a signal sampling processing module, the signal sampling processing module is connected with the controller, and the signal sampling processing module is used for extracting a 100Hz signal and amplifying the 100Hz signal; in one embodiment, the signal sampling processing module is provided with a signal sampling resistor and a band-pass filter connected with the signal sampling resistor; in one embodiment, as shown in fig. 6, the 3 operational amplifiers U1, U2, and U3 in the signal sampling processing module form a 3-order bandpass filter, the center frequency point is 100Hz, the bandwidth is 10Hz, and the amplification factor is 1. The resistor R1 is used as a signal sampling resistor and is connected in series in the excitation voltage loop, other signals are filtered after the signal passes through the third-order band-pass filter, only 2-order harmonic can be output through the 6 th pin of the chip U3, and therefore the signal sampling of the second harmonic is achieved, the 100Hz signal can be extracted, and the 100Hz signal is amplified. In one embodiment, the residual magnetism measuring structure further comprises an electric voltage regulator and a voltage output control module; the electric voltage regulator is used for generating a set output voltage under the driving of the voltage output control module to serve as an excitation voltage; the voltage output control module is used for adjusting the magnitude of the output voltage and controlling the collection module to collect the peak point of the voltage so as to ensure that the output voltage is applied to two ends of the power transformer winding at the voltage peak point, and in one embodiment, as shown in fig. 7, the electric voltage regulator is provided with a microswitch S1 which is grounded; in one embodiment, as shown in FIG. 8, the voltage output control module is provided with a stepper motor driver Dr1 and an optocoupler U1. Like this, have easy operation, demagnetization speed is fast, the demagnetization effect is obvious, the accurate quick advantage of remanence volume test, the demagnetization effect of traditional demagnetization device is generally less than 60%, and the demagnetization effect of using the power transformer demagnetization of this application and remanence measuring device can reach: single greater than 70%, automatic mode greater than 80%.
Further, in one embodiment, the acquisition module in the residual magnetism measurement structure is also an AD acquisition module, and the AD acquisition module can adopt the same structural product; the AD acquisition module may be referred to as a second AD acquisition module, and the AD acquisition module may be referred to as a first AD acquisition module. Further, in one embodiment, the residual magnetism measuring structure comprises an electric voltage regulator, a voltage output control module, a signal sampling processing module and an AD acquisition module; the electric voltage regulator, the voltage output control module and the signal sampling processing module are sequentially connected with the AD acquisition module. The electric voltage regulator is used for generating set voltage under the driving of the voltage output control module and taking the set voltage as excitation voltage; the voltage output control module is used for adjusting the output voltage, and the AD acquisition module acquires a peak value point of the voltage, so that the voltage is ensured to be applied to two ends of the transformer coil at the voltage peak value point, and test errors caused by different closing phase angles are avoided; the signal sampling module consists of a sampling resistor and a band-pass filter with the center frequency of 100Hz and the bandwidth of 10Hz, and is used for extracting 100Hz signals and amplifying the signals; the AD acquisition module is mainly used for testing the peak point of the output voltage and acquiring a 100Hz signal so as to quantify the residual magnetism. Therefore, by adopting the 16-bit AD acquisition chip, the measurement precision of the residual magnetism can reach 0.1 percent, the acquisition speed can reach 100MHz, the intelligent automatic test can be realized, the demagnetization process can be automatically completed, the residual magnetism detection result can be given, and the aim of overall demagnetization can be fulfilled only by demagnetizing the B of the transformer.
Further, as shown in fig. 1, in one embodiment, the apparatus includes a demagnetization structure, a remanence measurement structure, and a controller, where the demagnetization structure includes a voltage-controlled constant current source module, a current amplitude adjustment module, a current commutation module, an AD acquisition module (i.e., a first AD acquisition module), and a discharge protection module; the current amplitude adjusting module, the current reversing module and the discharge protection module are respectively connected with the AD acquisition module through voltage-controlled constant current source modules; the residual magnetism measuring structure comprises an electric voltage regulator, a voltage output control module, a signal sampling processing module and an AD acquisition module (namely a second AD acquisition module) which are sequentially connected; the controller is respectively connected with the current amplitude adjusting module, the current reversing module and the voltage output control module. By adopting the structural design, remanence is quantized by collecting second harmonic in exciting current, and the demagnetization effect can be verified, so that the demagnetization effect can be verified and analyzed; the demagnetization is carried out by adopting a direct-current attenuation and commutation mode, the remanence is eliminated or weakened in a mode of remanence covering and magnetic pole offsetting, the field implementation is easier, in the demagnetization process, the charging time of a transformer coil is shorter, the demagnetization speed is high, and the demagnetization effect is obvious; in practical tests, aiming at the demagnetization of a main transformer of 500kV, the traditional demagnetization method needs at least 30 minutes, and the demagnetization time of the device for demagnetizing the power transformer and measuring the remanence only needs about 8 minutes at most.
Because the device can detect the peak point of the excitation voltage, the change of the second harmonic component in the excitation current caused by different phase angles of the excitation voltage can be avoided, and the measurement of the remanence is more accurate. The device adopts direct current attenuation, commutation and demagnetization, and applies signals at the peak point of the excitation voltage, so that secondary remanence of the transformer iron core can not be caused.
It should be noted that other embodiments of the present invention further include an apparatus for demagnetizing a power transformer and measuring remanence, which is formed by combining the technical features of the above embodiments, and which can be implemented, and has the following advantages:
1. the operation is simple: the intelligent automatic test can be realized, the demagnetization process is automatically finished, the residual magnetism detection result is given, and the purpose of overall demagnetization can be achieved only by demagnetizing the B of the transformer;
2. the demagnetization speed is high: aiming at the demagnetization of a main transformer of 500kV, the traditional demagnetization method needs at least 30 minutes, and the demagnetization and remanence measurement device of the power transformer needs only about 8 minutes at most;
3. the demagnetization effect is obvious: the demagnetization effect of the traditional demagnetization device is generally less than 60%, and the demagnetization effect of the device for demagnetizing and measuring remanence of the power transformer can reach the following values: single greater than 70%, automatic mode greater than 80%;
4. the residual magnetism quantity test is accurate and quick: by adopting a 16-bit AD acquisition chip, the measurement precision of the residual magnetism can reach 0.1 percent, and the acquisition speed can reach 100 MHz.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A device for demagnetizing and measuring remanence of a power transformer is characterized by comprising a demagnetizing structure used for demagnetizing by adopting a direct-current attenuation and commutation mode, a remanence measuring structure used for quantifying remanence by collecting second harmonic in exciting current, and a controller respectively connected with the demagnetizing structure and the remanence measuring structure.
2. The apparatus according to claim 1, wherein the demagnetizing structure comprises a current commutation module for switching the direction of applied current to achieve a DC decaying commutation.
3. The apparatus of claim 2, wherein the degaussing structure further comprises a current amplitude adjustment module for controlling the time and magnitude of the output current.
4. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 3, wherein the demagnetizing structure further comprises an AD acquisition module for detecting demagnetizing current during demagnetizing.
5. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 4, wherein the demagnetizing structure further comprises a discharge protection module for protecting the output from damaging the apparatus by a back electromotive force generated in the winding of the power transformer at the moment of current change.
6. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 5, wherein the demagnetizing structure further comprises a constant current switching power supply module for providing a stable and adjustable DC current.
7. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 6, wherein the constant current switch power supply is a voltage controlled constant current source module.
8. The apparatus for demagnetizing power transformer and measuring remanence according to any one of claims 1 to 7, wherein the remanence measuring structure comprises an acquisition module and a metering module, the acquisition module is used for acquiring a second harmonic in an exciting current, the metering module is connected to the acquisition module, and the metering module is used for calculating remanence according to the acquisition result of the acquisition module.
9. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 8, wherein the metering module comprises a signal sampling processing module, and the signal sampling processing module is used for extracting a 100Hz signal and performing an amplification process on the 100Hz signal.
10. The apparatus for demagnetizing and measuring remanence of power transformer according to claim 9, wherein the remanence measuring structure further comprises an electric voltage regulator and a voltage output control module;
the electric voltage regulator is used for generating a set output voltage under the driving of the voltage output control module to serve as an excitation voltage;
the voltage output control module is used for adjusting the output voltage and controlling the acquisition module to acquire a peak value point of the voltage so as to ensure that the output voltage is applied to two ends of the power transformer winding at the voltage peak value point.
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| CN112051525A (en) * | 2020-07-10 | 2020-12-08 | 国家电网有限公司 | Transformer demagnetization analyzer and demagnetization analysis method |
| CN112731227A (en) * | 2020-12-31 | 2021-04-30 | 中国海洋石油集团有限公司 | Residual magnetism detection method for current transformer for protection |
| CN113805104A (en) * | 2021-08-16 | 2021-12-17 | 国家电网有限公司 | Large power transformer magnetizing inrush current discrimination method based on wavelet analysis signal energy characteristics |
| CN115032577A (en) * | 2022-08-10 | 2022-09-09 | 之江实验室 | Low-noise residual magnetism detection device and method for annular ferrite material |
| EP4209795A1 (en) * | 2022-01-10 | 2023-07-12 | Doble Engineering Company | Optimizing transformer exciting current and loss test results by dynamically managing core magnetic state |
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