CN111208374A - Device and method for injecting sinusoidal excitation signal into transformer winding - Google Patents
Device and method for injecting sinusoidal excitation signal into transformer winding Download PDFInfo
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Abstract
The invention discloses a device and a method for injecting a sinusoidal excitation signal into a transformer winding, and belongs to the technical field of state sensing of power transmission and transformation equipment. The device of the invention comprises: the upper computer generates an output signal command and transmits the output signal command to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap changer; the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction; the program-controlled winding tapping switch switches the tapping switch according to a switch action command and connects any one excitation winding in the 4-tap excitation windings into an electric appliance loop; and the 4-tap excitation winding is connected with the transformer winding, penetrates through the closed magnetic core of the 4-tap excitation winding, receives the sinusoidal excitation signal through switching of the programmable winding tap switch and injects the sinusoidal excitation signal into the transformer winding. The invention solves the problems of insufficient power of the sinusoidal excitation signal of the accessed transformer winding, lack of a strong magnetic field coupling loop and the like.
Description
Technical Field
The present invention relates to the field of power transmission and transformation equipment state sensing technology, and more particularly, to an apparatus and method for injecting a sinusoidal excitation signal into a transformer winding.
Background
The power transformer is a key core device of a power system, and as of 2015, the amount of the power transformer with the level of 110kV and above in a state network system exceeds 39000, the equipment loading amount is large, and the operation reliability of the power transformer is directly related to the power supply safety of the power system. However, in recent years, the transformer winding deformation fault is frequent and is located at the first fault of the transformer, in 2006-2015, the damage faults of 220kV and above transformers in national grid systems caused by winding deformation reach 81 times, and account for 33.8% of all the faults of the transformer. Frequent transformer winding deformation fault has led to the worry of very big equipment reliability, especially along with electric power system scale is bigger and bigger, and the capacity is higher and higher, and system short circuit current level promotes year by year, and transformer winding deformation fault hidden danger is more outstanding, and behind the system short circuit, how to detect out the transformer fast effectively and whether take place the winding and warp, avoid transformer fault damage, have become the problem of the key concern of operation and maintenance unit, need to solve urgently.
The frequency response method is the most effective technical means for detecting the winding deformation, and has good application effect in the aspect of offline detection of the transformer winding deformation, but the offline detection is limited by the power failure maintenance time of the tested equipment, and the winding deformation state in the running process of the transformer cannot be obtained in real time. The problem can be effectively solved by carrying out online monitoring on the deformation of the transformer winding based on a frequency response method, but an electrical network where the transformer winding is located under an online working condition relates to different load loops, which is completely different from a single transformer winding loop under an offline state, and a frequency response signal injection method, an extraction method and a fault diagnosis method used for offline detection cannot be directly applied to online monitoring. At present, no breakthrough is made on key problems of the on-line topological structure of the transformer on the action mechanism of the frequency response signal, the excitation signal injection method, the response signal monitoring, the on-line diagnosis algorithm and the like.
Disclosure of Invention
In view of the above problem, the present invention provides an apparatus for injecting a sinusoidal excitation signal into a transformer winding, comprising:
the upper computer generates an output signal command and transmits the output signal command to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap changer;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command and connects any one excitation winding in the 4-tap excitation windings into an electric appliance loop;
and the 4-tap excitation winding is connected with the transformer winding, penetrates through the closed magnetic core of the 4-tap excitation winding, receives the sinusoidal excitation signal through switching of the programmable winding tap switch and injects the sinusoidal excitation signal into the transformer winding.
Optionally, the frequency of the sinusoidal excitation signal is programmable and adjustable within a range of 100Hz to 2MHz, and the amplitude is programmable and adjustable within a range of 0 to 150Vpp, wherein the power of the sinusoidal excitation signal is 200W.
Optionally, the frequency range of 100Hz to 2MHz is divided into four frequency bands of low frequency, intermediate frequency, medium frequency, high frequency and high frequency.
Optionally, the 4-tap excitation winding includes 4 excitation windings, and the 4 excitation windings receive sinusoidal excitation signals of four frequency bands of low frequency, medium frequency, and high frequency respectively by at least two times according to the number of turns of the excitation windings.
Optionally, the programmable winding tap switch is a high-frequency switch gating circuit with one out of four.
The invention also provides a method for injecting a sinusoidal excitation signal into a transformer winding, comprising the following steps:
the upper computer generates an output signal instruction and transmits the output signal instruction to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap switch;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command, and any exciting winding in the 4-tap exciting windings is connected into an electric appliance loop;
the 4-tap excitation winding is connected with the transformer winding, the transformer winding penetrates through a closed magnetic core of the 4-tap excitation winding, and a sinusoidal excitation signal is received and injected into the transformer winding through switching of the programmable winding tap switch.
Optionally, the frequency of the sinusoidal excitation signal is programmable and adjustable within a range of 100Hz to 2MHz, and the amplitude is programmable and adjustable within a range of 0 to 150Vpp, wherein the power of the sinusoidal excitation signal is 200W.
Optionally, the frequency range of 100Hz to 2MHz is divided into four frequency bands of low frequency, intermediate frequency, medium frequency, high frequency and high frequency.
Optionally, the 4-tap excitation winding includes 4 excitation windings, and the 4 excitation windings receive sinusoidal excitation signals of four frequency bands of low frequency, medium frequency, and high frequency respectively by at least two times according to the number of turns of the excitation windings.
Optionally, the programmable winding tap switch is a high-frequency switch gating circuit with one out of four.
The invention solves the problems of insufficient power and lack of a strong magnetic field coupling loop of a sinusoidal excitation signal of an accessed transformer winding, and the like, and the sinusoidal excitation signal with the signal-to-noise ratio meeting the measurement requirement is injected into the transformer winding in a non-contact manner.
Drawings
FIG. 1 is a block diagram of an apparatus for injecting a sinusoidal excitation signal into a transformer winding in accordance with the present invention;
FIG. 2 is a structural diagram of a programmable winding tap changer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of a programmable winding tap changer according to an embodiment of the present invention;
FIG. 4 is a diagram of a frequency sweeping signal generator DDS according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a DDS digital circuit timing control of an embodiment of an apparatus for injecting a sinusoidal excitation signal into a transformer winding according to the present invention;
FIG. 6 is a block diagram of a current steering DAC of an embodiment of an apparatus for injecting a sinusoidal excitation signal into a transformer winding according to the present invention;
fig. 7 is a circuit diagram of a high-frequency high-power discharger according to an embodiment of the apparatus for injecting a sinusoidal excitation signal into a transformer winding of the present invention;
FIG. 8 is a graph showing a frequency error of a sinusoidal signal in a range of 100Hz to 2MHz according to an embodiment of the present invention;
fig. 9 is a flow chart of a method for injecting a sinusoidal excitation signal into a transformer winding according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention proposes a device for injecting a sinusoidal excitation signal into a transformer winding, as shown in fig. 1, comprising:
the upper computer generates an output signal command and transmits the output signal command to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap changer;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command and connects any one excitation winding in the 4-tap excitation windings into an electric appliance loop;
and the 4-tap excitation winding is connected with the transformer winding, penetrates through the closed magnetic core of the 4-tap excitation winding, receives the sinusoidal excitation signal through switching of the programmable winding tap switch and injects the sinusoidal excitation signal into the transformer winding.
The frequency of the sine excitation signal is programmable and adjustable within the range of 100 Hz-2 MHz, and the amplitude is programmable and adjustable within the range of 0-150 Vpp, so that the power of the sine excitation signal is 200W.
The frequency range of 100 Hz-2 MHz is divided into four frequency ranges of low frequency, intermediate frequency, medium-high frequency and high frequency.
The 4-tap excitation winding comprises 4 excitation windings, and at least four sinusoidal excitation signals of low frequency, medium frequency and high frequency are respectively received by the 4 excitation windings according to the number of turns of the excitation windings.
The program-controlled winding tap switch is a high-frequency switch gating circuit with one out of four.
The invention is further illustrated by the following examples:
as shown in fig. 1, the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal;
the 4-tap excitation winding is composed of 4 sections of windings with different turns wound on a closed magnetic core;
the program-controlled winding tap switch is composed of 4 groups of program-controlled high-frequency switches, and program-controlled switching of exciting windings with different turns is realized.
The working principle is as follows:
and the upper computer sends out a frequency and amplitude instruction of an output signal to the high-frequency high-power sinusoidal signal source, and the output frequency and amplitude of the high-frequency high-power sinusoidal signal source meet the sinusoidal signal required by the instruction of the upper computer.
The upper computer sends a switching action command to the program control type winding tapping switch, the program control type excitation winding tapping switch carries out switching according to the command requirement of the upper computer, and a specific tap of the excitation winding is connected into an electric loop.
The wiring of the transformer winding to be tested penetrates through the closed magnetic core where the exciting winding is located, according to the electromagnetic coupling principle, the exciting winding connected into the electric loop can generate induced current I in a secondary loop where the transformer winding to be tested is located, and induced electromotive force U is further established at two ends of the transformer winding to be tested.
In order to obtain higher coupling efficiency, the frequency range of 100 Hz-2 MHz is divided into four frequency ranges of low frequency, medium frequency and high frequency, excitation windings with different turns are selected for each frequency range to carry out signal coupling, and the lower the frequency range, the more the number of turns of the excitation windings are selected. And excitation windings with different turns are switched by a programmable excitation winding tapping unit.
The program-controlled excitation winding tap switch consists of four groups of four-to-one high-frequency switch gating circuits, when any switch in each group is closed, other switches are all opened, as shown in fig. 2, the circuit is voltage-resistant DC200V, current 1A and DC12V are used for supplying power, and a USB interface is used for controlling.
The working principle of the program-controlled excitation winding tap switch is shown in fig. 3, wherein 1 and 2 groups of switches are respectively connected with the head end and the tail end of 4 excitation windings to realize the four-to-one gating of the four excitation windings, and 3 and 4 groups of switches are respectively connected with the matching resistors of the excitation windings to realize the four-to-one gating of the matching resistors.
The upper computer gives an instruction to close the K11, K21, K31 and K41 switches, then other switches are opened, at the moment, the circuit connects the excitation winding L1 and the matching resistor R1 into a signal loop, the output signal of the high-frequency high-power sinusoidal signal source is applied to two ends of the excitation winding L1, and the excitation winding L1 realizes the coupling injection of the signal.
Because the exciting winding is inductive under the high-frequency condition, the inductive reactance value increases along with the increase of the frequency under the condition of the same turn number, and the inductive reactance value increases along with the increase of the turn number under the condition of the same frequency. In order to obtain higher electromagnetic coupling efficiency, excitation windings with different numbers of turns are selected for signals of different frequency bands for electromagnetic coupling, a multi-turn excitation winding is used when the frequency is low, and a few-turn excitation winding is used when the frequency is high.
1 kHz-2 MHz is divided into four different frequency bands of a low frequency band, a middle frequency band and a high frequency band, and the corresponding relation between each frequency band and an excitation winding is shown in Table 1.
TABLE 1
| Starting frequency | Cut-off frequency | Excitation winding | Matching resistor | |
| Low frequency band | 1kHz | 100kHz | L1 | R1 |
| Intermediate frequency band | 100kHz | 500kHz | L2 | R2 |
| Middle and high frequency band | 500kHz | 1MHz | L3 | R3 |
| High frequency band | 1MHz | 2MHz | L4 | R4 |
The basic parameters of the high-frequency high-power sinusoidal signal source are as follows:
the amplitude precision is better than 1 percent through the program control type adjustment of the signal output range of 0-150 Vpp, the signal output frequency is 100 Hz-2 MHz, the adjustment precision is 100Hz, the frequency error of each frequency point is not more than 0.01 percent, the continuous sweep frequency output within the range of 100 Hz-2 MHz can be carried out, the amplitude of the output signal is adjustable within the range of 0-150 Vpp, the excitation signal can be injected into the winding of the transformer in a coupling mode under the condition that the transformer runs with load, the injection signal is not distorted, and the coupling efficiency is not lower than 80 percent.
The lower computer is used for carrying out control instruction interaction with an upper computer through a wired or wireless network, the upper computer can carry out switching and instruction control on not less than 3 lower computer networks, and the control response time delay is not more than 5 ms.
The open source code and the interface protocol for carrying out control instruction interaction with the upper computer are provided, and a high-level application program and a human-computer interaction interface can be developed on the upper computer according to the user requirements.
The principle is as follows:
the direct Digital Frequency Synthesis (DDS) technology is adopted to generate sine wave signals with different frequencies, a scanning sine signal source is generated by a DDS, the output Frequency change of the scanning sine signal source is controlled by a Digital circuit, the Frequency resolution can reach below 1Hz, and the generated excitation sine wave is filtered and amplified outside a chip and then drives a transformer by a power amplifier.
The working clock frequency of the DDS sinusoidal signal generator is 50MHz, the output frequency band range is 0.1 kHz-2 MHz, and the output frequency resolution is 100 Hz.
The schematic block diagram of the DDS module system is shown in fig. 4, and includes: the digital-to-analog converter comprises a phase accumulator, a ROM lookup table, a digital-to-analog converter DAC and the like, wherein the phase accumulator and a sine lookup table ROM are realized through digital technology, the DAC is realized through analog circuit design, the number of bits of the phase accumulator is 32 bits, the theoretical frequency resolution is 0.11Hz, the bit width of a phase control word is 5 bits, the phase control precision is 11.25 degrees, the size of the sine lookup table is realized by adopting 4096 words of 14-bit ROMs, and the DAC is a 14-bit high-precision current steering DAC system clock which is 50MHz and is generated by an external crystal oscillator.
The time sequence control of the DDS digital circuit is shown in FIG. 5, and the working process is as follows: the input data is input in 8-bit parallel, because the frequency control word is 32 bits, the phase control word is 5 bits, therefore, all data is refreshed once, 8-bit parallel data is input 5 times, and the data is stored in the 40-bit input register controlled by 5 cycles of W _ CLK, wherein, the upper 5 bits are the phase control word, and the lower 32 bits are the frequency control word. FQ _ UD controls to store data in an input register into a data uploading register, 5-bit phase control words are converted into 32-bit digital codes corresponding to angles, an accumulator reads the data in the data uploading register under the control of a system clock to carry out accumulation calculation, wherein the 32-bit phase control words converted by the 5-bit phase control words are used as a first accumulated value of the accumulator, namely the initial phase of an output signal is determined, the phase is controllable, then 32-bit frequency control words are input to be accumulated, an accumulated value is output in each clock period, then the high 12-bit accumulated value is intercepted and used as an address code addressing of a ROM to output corresponding quantized amplitude information, and finally a sine signal with required frequency is obtained through digital-to-analog conversion.
For the digital module design part of the DDS module, the larger the bit number N of the phase accumulator is, the higher the resolution of the DDS is. The DDS outputs a sine signal of one period every time the phase accumulator overflows, so that the frequency resolution of the DDS is determined by the system clock frequency and the number of bits of the phase accumulator, and the frequency resolution formula of the DDS is shown as formula (1).
In order to make the DDS have a high enough frequency resolution to meet the design criteria of frequency deviation less than 0.1%, i.e. when the frequency of the DDS output signal is 1kHz, the deviation allowed by the frequency of the DDS output signal is within 1Hz, therefore, the frequency resolution of the DDS should be less than 1 Hz. The DAC module design inside the DDS is shown in fig. 6.
The DAC comprises a delay circuit, a decoding and latch circuit, a switch driving circuit, a band-gap reference circuit, a current source array, a switch array, an external resistor and the like, the power supply voltage of the DAC digital circuit is 1.8V, and the power supply voltage of the analog circuit is 3.3V, so that the influence of the noise of the digital circuit on the analog circuit is reduced, and meanwhile, the power consumption of the digital circuit is reduced. The DAC design adopts segmented current steering to realize high-speed decoding, factors such as DAC performance, chip area, circuit implementation complexity and the like are considered in a compromise mode, and a 6+2+6 segmented ratio structure is determined, wherein high 6 bits and middle 2 bits are thermometer codes, and low 6 bits are binary codes. The band gap reference is connected with a current source array through a bias circuit to provide current. After the digital code is input, the digital code firstly passes through a decoding circuit, a latch circuit and a switch driving circuit and finally is sent to a switch array, the on and off of a switch are controlled, a pair of differential currents are generated, and the currents generate voltage on an external resistor to provide final output.
Because the sine wave signal generated by the DDS has smaller voltage amplitude and the requirement of the power driving signal for exciting the transformer winding is higher, a power amplifying circuit is required to be added to amplify the original signal generated by the DDS. A high-frequency high-power MOSFET is used as a power amplifier tube, a complementary push-pull amplifier is formed to provide required output amplification voltage and output power, and the structure is shown in figure 7.
The 4-tap excitation winding uses 0.9mm diameter enameled wire to wind 4 sections of independent windings with different turns on a closed magnetic core as 4 excitation windings, which are respectively defined as L1, L2, L3 and L4, wherein the number of turns of the L1 winding is the largest, and the number of turns of L2, L3 and L4 are reduced in sequence. The head end and the tail end of each excitation winding are taken as taps to be led out, and the basic technical parameters of the excitation windings are as follows:
6dB bandwidth, including the frequency range of 1 kHz-2 MHz;
the flatness in the band is not more than 2 dB.
The inner diameter of the closed magnetic core is not less than 600 mm.
The device records oscilloscope readings when the output amplitude of the high-frequency high-power sinusoidal signal source is 50Vpp, 100Vpp, 120Vpp and 150Vpp at the output frequencies of 100kHz, 500kHz, 1MHz, 1.5MHz and 2MHz respectively, and calculates the amplitude error of the output signal under each frequency, and the error calculation formula is shown in formula 2.
In the formula: gamma rayvAbsolute error of the amplitude of the output signal at a specific frequency;
Vxoutputting the measured value of the signal amplitude under the specific frequency;
VNthe set value of the amplitude of the output signal at a specific frequency.
The test results are shown in Table 2.
TABLE 2
The method comprises the steps that a high-frequency high-power sinusoidal signal is controlled by an upper computer program to output a sinusoidal frequency sweeping signal with the amplitude of 150Vpp in a certain step length within the frequency range of 100 Hz-2 MHz, wherein the frequency sweeping step length of 100 Hz-1 kHz and the frequency sweeping step length of 1 kHz-2 MHz are 100kHz, an oscilloscope measures the frequency of output signals of each frequency point in real time through a 100-time attenuation probe and calculates frequency errors, a frequency error curve within the range of 100 Hz-2 MHz is drawn, and the calculation formula of the frequency error curve is as shown in formula 3.
γfIs the absolute error of the output signal frequency at a particular frequency;
fxthe measured value of the output signal frequency under a specific frequency, x is 0.1kHz,0.2kHz,0.3kHz … 1kHz,2kHz,3kHz … 2000 kH;
fNis a set value of the output signal frequency under a specific frequency.
The frequency error curve in the range of 100Hz to 2MHz is shown in FIG. 8.
TABLE 3
The present invention also proposes a method for injecting a sinusoidal excitation signal into a transformer winding, as shown in fig. 9, comprising:
the upper computer generates an output signal instruction and transmits the output signal instruction to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap switch;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command, and any exciting winding in the 4-tap exciting windings is connected into an electric appliance loop;
the 4-tap excitation winding is connected with the transformer winding, the transformer winding penetrates through a closed magnetic core of the 4-tap excitation winding, and a sinusoidal excitation signal is received and injected into the transformer winding through switching of the programmable winding tap switch.
The frequency of the sine excitation signal is programmable and adjustable within the range of 100 Hz-2 MHz, and the amplitude is programmable and adjustable within the range of 0-150 Vpp, so that the power of the sine excitation signal is 200W.
The frequency range of 100 Hz-2 MHz is divided into four frequency ranges of low frequency, intermediate frequency, medium-high frequency and high frequency.
The 4-tap excitation winding comprises 4 excitation windings, and at least four sinusoidal excitation signals of low frequency, medium frequency and high frequency are respectively received by the 4 excitation windings according to the number of turns of the excitation windings.
The program-controlled winding tap switch is a high-frequency switch gating circuit with one out of four.
The invention solves the problems of insufficient power and lack of a strong magnetic field coupling loop of a sinusoidal excitation signal of an accessed transformer winding, and the like, and the sinusoidal excitation signal with the signal-to-noise ratio meeting the measurement requirement is injected into the transformer winding in a non-contact manner.
Claims (10)
1. An apparatus for injecting a sinusoidal excitation signal into a transformer winding, the apparatus comprising:
the upper computer generates an output signal command and transmits the output signal command to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap changer;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command and connects any one excitation winding in the 4-tap excitation windings into an electric appliance loop;
and the 4-tap excitation winding is connected with the transformer winding, penetrates through the closed magnetic core of the 4-tap excitation winding, receives the sinusoidal excitation signal through switching of the programmable winding tap switch and injects the sinusoidal excitation signal into the transformer winding.
2. The device of claim 1, wherein the frequency of the sinusoidal excitation signal is programmable and adjustable within a range of 100 Hz-2 MHz, and the amplitude of the sinusoidal excitation signal is programmable and adjustable within a range of 0-150 Vpp, and the power of the sinusoidal excitation signal is 200W.
3. The apparatus of claim 2, wherein the frequency range of 100Hz to 2MHz is divided into four frequency bands of low frequency, medium frequency and high frequency.
4. The apparatus of claim 1, the 4-tap excitation winding comprising 4 excitation windings, the 4 excitation windings receiving sinusoidal excitation signals of at least four bands of low frequency, medium frequency, and high frequency, respectively, according to the number of excitation winding turns.
5. The apparatus of claim 1, the programmable winding tap changer being a one-out-of-four high frequency switching gating circuit.
6. A method for injecting a sinusoidal excitation signal into a transformer winding, the method comprising:
the upper computer generates an output signal instruction and transmits the output signal instruction to a high-frequency high-power sinusoidal signal source, and a switching action command is issued to the program-controlled winding tap switch;
the high-frequency high-power sinusoidal signal source outputs a sinusoidal excitation signal after receiving an output signal instruction;
the program-controlled winding tapping switch switches the tapping switch according to a switch action command, and any exciting winding in the 4-tap exciting windings is connected into an electric appliance loop;
the 4-tap excitation winding is connected with the transformer winding, the transformer winding penetrates through a closed magnetic core of the 4-tap excitation winding, and a sinusoidal excitation signal is received and injected into the transformer winding through switching of the programmable winding tap switch.
7. The method according to claim 6, wherein the frequency of the sinusoidal excitation signal is programmable and adjustable within a range of 100 Hz-2 MHz, and the amplitude of the sinusoidal excitation signal is programmable and adjustable within a range of 0-150 Vpp, and the power of the sinusoidal excitation signal is 200W.
8. The method of claim 7, wherein the frequency range of 100 Hz-2 MHz is divided into four frequency bands of low frequency, medium frequency and high frequency.
9. The method of claim 1, wherein the 4-tap excitation winding comprises 4 excitation windings, and the 4 excitation windings receive sinusoidal excitation signals of four frequency bands of low frequency, medium frequency and high frequency respectively by at least one number according to the number of excitation winding turns.
10. The method of claim 1, wherein the programmable winding tap changer is a one-out-of-four high frequency switching gating circuit.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010230479A (en) * | 2009-03-27 | 2010-10-14 | Tokyo Electric Power Co Inc:The | Internal diagnostic method of transformer |
| CN104535955A (en) * | 2015-01-15 | 2015-04-22 | 国网四川省电力公司电力科学研究院 | Calibration device and method of transformer frequency response method winding deformation tester |
| CN105119587A (en) * | 2015-08-28 | 2015-12-02 | 南京邮电大学 | Magnetic loss automatic test platform and sinusoidal excitation signal source used by same |
| CN107390081A (en) * | 2017-08-07 | 2017-11-24 | 华北电力大学 | It is a kind of to be used for the device and method being monitored powered to deformation of transformer winding |
| CN208026684U (en) * | 2018-01-31 | 2018-10-30 | 苏州智能制造研究院有限公司 | A kind of difference frequency continuation sinusoidal radiating circuit |
| CN110164671A (en) * | 2019-06-26 | 2019-08-23 | 山东电工电气集团智能电气有限公司 | Distribution transformer and its monitoring device |
-
2020
- 2020-02-28 CN CN202010129781.XA patent/CN111208374A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010230479A (en) * | 2009-03-27 | 2010-10-14 | Tokyo Electric Power Co Inc:The | Internal diagnostic method of transformer |
| CN104535955A (en) * | 2015-01-15 | 2015-04-22 | 国网四川省电力公司电力科学研究院 | Calibration device and method of transformer frequency response method winding deformation tester |
| CN105119587A (en) * | 2015-08-28 | 2015-12-02 | 南京邮电大学 | Magnetic loss automatic test platform and sinusoidal excitation signal source used by same |
| CN107390081A (en) * | 2017-08-07 | 2017-11-24 | 华北电力大学 | It is a kind of to be used for the device and method being monitored powered to deformation of transformer winding |
| CN208026684U (en) * | 2018-01-31 | 2018-10-30 | 苏州智能制造研究院有限公司 | A kind of difference frequency continuation sinusoidal radiating circuit |
| CN110164671A (en) * | 2019-06-26 | 2019-08-23 | 山东电工电气集团智能电气有限公司 | Distribution transformer and its monitoring device |
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