CN114236271A - On-site calibration method and system for transformer comprehensive detection device - Google Patents
On-site calibration method and system for transformer comprehensive detection device Download PDFInfo
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Abstract
The invention provides a field calibration method and a system for a transformer comprehensive detection device, which comprise the following steps: the device comprises a variable load box, a signal conditioning unit and a power amplifying unit; the high-voltage side and low-voltage side three-phase current output terminals of the transformer comprehensive detection device are respectively connected with the variable load box; the variable load box converts the received current signal into a reference voltage signal and transmits the reference voltage signal to the signal conditioning unit; the signal conditioning unit is used for adjusting the amplitude and the phase of the reference voltage signal and transmitting the reference voltage signal to the power amplifying unit; the power amplification unit is used for carrying out power amplification on the conditioned signal, outputting a high-voltage standard voltage signal and a low-voltage standard voltage signal, and returning the high-voltage standard voltage signal and the low-voltage standard voltage signal to a three-phase high-voltage side and low-voltage side voltage measurement input terminal of the transformer comprehensive detection device; and the parameters of the variable load box, the signal conditioning unit and the power amplification unit are regulated in a program-controlled manner, the relevant characteristic parameters of the transformer are simulated, and the field verification of the comprehensive detection device of the transformer is carried out.
Description
Technical Field
The invention belongs to the technical field of power measurement, and particularly relates to a field calibration method and device for a transformer comprehensive detection device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The transformer comprehensive detection device is used for measuring parameters such as insulation resistance, winding direct-current resistance, transformation ratio, empty load loss, external withstand voltage, induction withstand voltage, dielectric loss factor and the like of the power transformer.
The instrument mainly measures resistance, current and voltage by a four-terminal method, and accesses to the tested electrical equipment by outputting stable alternating current and direct current voltage and current power sources, measures the voltage, current amplitude and phase value of the equipment, and calculates the resistance, current and voltage parameters of the equipment.
For a transformer comprehensive detection device, the traditional calibration method mainly uses a corresponding calibration device to calibrate each test parameter, so that the method occupies more equipment, is complicated in wiring and takes a long time for testing.
At present, research on simulating impedance by using a virtual technology is carried out at home and abroad to a certain extent.
For example: in the prior art, an inductance value is simulated by using an RC network and is used for calibrating the inductance function of the 4TP impedance measuring instrument.
In the prior art, an active analog impedance standard is developed, and complex impedance is simulated by using a digital analog impedance technology to realize calibration of an alternating current digital bridge.
In the prior art, the equivalent output impedance of the micro-grid parallel inverter is adjusted by adopting the self-adaptive virtual impedance, so that the micro-grid parallel inverter tends to be in an inductive state.
In the prior art, a generalized impedance transformation circuit is used for realizing a fractional order analog inductor and a 0-2 order analog capacitor.
The transformer comprehensive detection device integrates measurement modules of various parameters, is arranged on a transformer detection production line, has the characteristics of high voltage and large current for an external interface, and has higher requirement on the power of a load. The existing virtual impedance technology is only limited to low-power impedance or high-power load, the high-power load is mainly used for function adjustment, the accuracy is low, and the high-power load is difficult to be used for measurement function verification, so that the analog impedance in the technology is only suitable for specific occasions and is difficult to be suitable for verification of the transformer comprehensive detection device needing to verify various test parameters.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a field calibration method and a field calibration system for a transformer comprehensive detection device, which consider the measurement characteristics and the interface characteristics of the transformer comprehensive detection device and solve the problems of single calibration standard value, poor universality, poor stability, low automation rate and the like of the traditional transformer detection device.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, a transformer comprehensive detection device field calibration system is disclosed, comprising:
the device comprises a variable load box, a signal conditioning unit and a power amplifying unit;
the high-voltage side and low-voltage side three-phase current output terminals of the transformer comprehensive detection device are respectively connected with the variable load box;
the variable load box converts the received current signal into a reference voltage signal and transmits the reference voltage signal to the signal conditioning unit;
the signal conditioning unit is used for adjusting the amplitude and the phase of the reference voltage signal and transmitting the reference voltage signal to the power amplifying unit;
the power amplification unit is used for carrying out power amplification on the conditioned signal, outputting a high-voltage standard voltage signal and a low-voltage standard voltage signal, and returning the high-voltage standard voltage signal and the low-voltage standard voltage signal to a three-phase high-voltage side and low-voltage side voltage measurement input terminal of the transformer comprehensive detection device;
and the parameters of the variable load box, the signal conditioning unit and the power amplification unit are regulated in a program-controlled manner, the relevant characteristic parameters of the transformer are simulated, and the field verification of the comprehensive detection device of the transformer is carried out.
In a further technical scheme, the variable load box is used for simulating a typical load of the transformer and absorbing the power of the comprehensive detection device of the transformer.
In a further preferred technical scheme, the variable load box comprises a plurality of standard power resistance components and a program-controlled switch array;
the resistance value and the power index of each standard power resistor component respectively correspond to the upper limit and the lower limit of the measurement range of the insulation resistance, the winding direct-current resistance, the transformation ratio and the empty load loss of the transformer comprehensive detection device;
and the program control switch array switches and accesses each standard power resistance component corresponding to the measurement range and the upper and lower limits of the power index of the transformer comprehensive detection device according to the difference of the measurement items and the measurement points of the transformer comprehensive detection device to simulate the typical load points of the transformer.
According to a further technical scheme, the signal conditioning unit comprises a program-controlled voltage amplitude conversion component and a program-controlled phase angle conversion component;
the program-controlled voltage amplitude conversion assembly is used for adjusting the proportional coefficient of voltage measurement signals at the high-voltage side and the low-voltage side of the transformer comprehensive detection device and current output signals, and carrying out wide-range simulation on the resistance characteristic parameters of the power transformer;
the program-controlled phase angle conversion component is used for adjusting phase angles of voltage measurement signals and current output signals of high-voltage and low-voltage sides of the transformer comprehensive detection device and simulating impedance characteristic parameters.
In a further preferred technical scheme, the programmable voltage amplitude conversion component is realized by a programmable attenuator;
the program control phase angle conversion component is realized by synthesizing a differential operation amplifying circuit, an integral operation amplifying circuit, a voltage follower and a program control gain circuit.
According to the further technical scheme, the power amplification unit amplifies the weak voltage signal output by the signal conditioning unit to a high voltage signal corresponding to the voltage measurement unit of the transformer comprehensive detection device by using a high-accuracy voltage amplification circuit.
According to the further technical scheme, an interface of the checking system, which is externally connected, is consistent with the comprehensive detection device of the transformer.
In a second aspect, a field calibration method for a transformer comprehensive detection device is disclosed, which comprises the following steps:
simulating characteristic parameters of the power transformer by changing the amplitude and phase function relationship between the high-voltage standard voltage signals and the low-voltage standard voltage signals and the high-voltage side current output signals and the low-voltage side current output signals of the transformer comprehensive detection device;
and carrying out integrated on-site verification on the measurement performance of the transformer comprehensive detection device based on the simulated characteristic parameters of the power transformer.
According to a further technical scheme, the simulated characteristic parameters of the power transformer comprise insulation resistance of the power transformer, direct-current resistance of a winding, transformation ratio and empty load loss.
The further technical scheme includes that the method further comprises the following steps of when the characteristic parameters of the power transformer are simulated: and switching the load connected to the transformer comprehensive detection device according to different measurement items and measurement points of the transformer comprehensive detection device, and simulating typical load points of the transformer.
The further technical scheme includes that the method further comprises the following steps of when the characteristic parameters of the power transformer are simulated:
the proportional coefficient of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the comprehensive detection device of the regulating transformer realizes wide-range simulation of the resistance characteristic parameters, and the resistance characteristic parameters comprise: insulation resistance and winding direct current resistance of the power transformer;
and adjusting the phase angle of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the transformer comprehensive detection device to realize the simulation of impedance characteristic parameters, wherein the impedance characteristic parameters comprise transformation ratio and empty load loss.
The above one or more technical solutions have the following beneficial effects:
the invention adopts a virtual impedance method to simulate the characteristic parameters of the power transformer such as insulation resistance, winding direct-current resistance, transformation ratio, empty load loss and the like, and realizes the integrated on-site verification of the measurement performance of the transformer comprehensive detection device. Compared with the traditional calibration method, the functions of various calibration devices required by calibration are integrated, the externally connected interfaces are completely consistent with the power transformer, the measurement components of the comprehensive detection device of the transformer do not need to be disassembled, the problem of the calibration under the restriction conditions that the measurement components of the comprehensive detection device of the transformer are inconvenient to disassemble and the like can be solved, the automation degree is high, the labor cost is low, and the working efficiency is high.
The signal conditioning unit of the checking system comprises a program-controlled voltage amplitude conversion component and a phase angle conversion component, and realizes wide-range simulation of resistance characteristic parameters of insulation resistance, winding direct-current resistance and the like of the power transformer by adjusting the proportional coefficients and phase angles of voltage measurement signals and current output signals of the high-voltage side and the low-voltage side of the transformer comprehensive detection device.
The variable load box of the checking system comprises a plurality of standard power resistance components and a program control switch array, and the simulation of the typical load point of the transformer is realized by switching each standard power resistance component corresponding to the measuring range of the transformer comprehensive detection device and the upper limit and the lower limit of the power index.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of field calibration of a transformer comprehensive detection device according to an embodiment of the invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
The invention provides a virtual impedance method-based transformer comprehensive detection device field calibration method and system aiming at the measurement characteristics and interface characteristics of the transformer comprehensive detection device, and solves the problems of single calibration standard value, poor universality, poor stability, low automation rate and the like of the traditional transformer detection device.
When the transformer comprehensive detection device detects a transformer, a test signal of the transformer comprehensive detection device is usually output through a high-voltage side or low-voltage side current output terminal, and then a voltage signal is measured through a high-voltage side or low-voltage side voltage measurement terminal, and a current measurement signal is usually integrated inside the detection device. The external interfaces of the detection device only include high-voltage side current output interfaces Iha, Ihb, Ihc and Ihn, high-voltage side voltage measurement interfaces Uha, Uhb, Uhc and Uhn, low-voltage side current output interfaces Ila, Ilb, Ilc and Iln, low-voltage side voltage measurement interfaces Ula, Ulb, ullc and Uln, and instruments aiming at different measurement items such as insulation resistance, winding direct-current resistance, transformation ratio and no-load loss are generally integrated inside the detection device.
When the transformer detection device is verified by the traditional method, the detection device needs to be disassembled, and each measurement function module needs to be verified separately, so that the process is complicated, the working efficiency is low, and the function failure of the detection device is easily caused in the disassembling and assembling process. The invention adopts an integrated design, the interface of the calibration device which is externally connected is completely consistent with the comprehensive detection device of the transformer, the detection device does not need to be disassembled, and the invention has good stability and high working efficiency.
The interface of the checking device for external connection is a measurement signal interface and is used for simulating the design of the three-phase high-voltage side and low-voltage side terminal forms of the power transformer, so that the transformer comprehensive detection device can be connected like a detection transformer.
In an embodiment, referring to fig. 1, the present embodiment discloses a field calibration system for a transformer comprehensive testing device, including:
the device comprises a variable load box, a signal conditioning unit and a power amplifying unit;
the high-voltage side and low-voltage side three-phase current output terminals of the transformer comprehensive detection device are respectively connected with the variable load box;
the variable load box converts the received current signal into a reference voltage signal and transmits the reference voltage signal to the signal conditioning unit;
the signal conditioning unit is used for adjusting the amplitude and the phase of the reference voltage signal and transmitting the reference voltage signal to the power amplifying unit;
the power amplification unit is used for carrying out power amplification on the conditioned signal, outputting a high-voltage standard voltage signal and a low-voltage standard voltage signal, and returning the high-voltage standard voltage signal and the low-voltage standard voltage signal to a three-phase high-voltage side and low-voltage side voltage measurement input terminal of the transformer comprehensive detection device;
and the parameters of the variable load box, the signal conditioning unit and the power amplification unit are regulated in a program-controlled manner, the relevant characteristic parameters of the transformer are simulated, and the field verification of the comprehensive detection device of the transformer is carried out.
The calibration device is based on a virtual impedance method, and realizes the integrated on-site calibration of the measurement performance of the transformer comprehensive detection device by changing the amplitude and phase function relationship between the high-voltage standard voltage signal and the low-voltage standard voltage signal and the high-voltage side and low-voltage side current output signals of the transformer comprehensive detection device and simulating the characteristic parameters of the insulation resistance, the winding direct-current resistance, the transformation ratio, the empty load loss and the like of the power transformer.
The invention realizes the change of input and output voltage, current amplitude ratio and phase difference by controlling the gain of the program control amplifier and the phase shift of the phase shifter through the central processing unit.
The functional relationships are specifically input and output voltages, current amplitude ratios and phase difference values.
When the characteristic parameter is simulated, for example, the winding dc resistance value is simulated as R, and the input current is I, the gain of the programmable amplifier is adjusted so that the output U is IR, and then the winding dc resistance with the resistance value of R is simulated.
In the realization of integrated on-site calibration, the calibration device of the invention realizes the modularized design of the functions of the acquisition, conditioning and output parts, the functional relation of input and output signals can be configured in real time by software, the measurement signal interface simulates the wiring column form design of the three-phase high-voltage side and the low-voltage side of the power transformer, and the calibration of the measurement performance of a plurality of parameters can be realized by one-time wiring.
Wherein, variable load case: the device is used for simulating a typical load of the transformer and absorbing the power of the comprehensive detection device of the transformer, and comprises a plurality of standard power resistance components and a program-controlled switch array, and is used for simulating the load condition of the transformer so as to guarantee the working state of the detection device. The resistance value and the power index of each standard power resistor component correspond to the upper limit and the lower limit of the measurement range of the transformer comprehensive detection device, and the simulation of the typical load point of the transformer is realized. The program control switch array switches and accesses loads of the transformer comprehensive detection device according to different measurement items and measurement points of the transformer comprehensive detection device, for example, when the winding direct-current resistance is verified, the switched and accessed loads are winding direct-current resistance values of transformers of corresponding models.
When the resistance value and the power index of each standard power resistor component correspond to the upper limit and the lower limit of the measurement range of the transformer comprehensive detection device, the selection of the power components is determined by the type of the transformer aimed by the transformer comprehensive detection device, and the power components corresponding to the transformers of different types are different.
A signal conditioning unit: including programmable voltage amplitude conversion and phase angle conversion components. The programmable amplitude conversion assembly is used for adjusting the proportionality coefficient of voltage measurement signals at the high-voltage side and the low-voltage side of the transformer comprehensive detection device and current output signals, and realizing wide-range simulation of resistance characteristic parameters such as insulation resistance of a power transformer and direct-current resistance of a winding, for example, the value of a simulated winding direct-current resistance is R, and the value of an input current is I, so that the value of the output U is IR, and the value of the winding direct-current resistance with the resistance of R is simulated by adjusting the gain of the programmable amplifier.
The programmable phase angle conversion component is used for adjusting a phase angle of a voltage measurement signal and a current output signal at a high voltage side and a low voltage side of the transformer comprehensive detection device, and realizing simulation of impedance characteristic parameters such as transformation ratio, empty load loss and the like.
The programmable voltage amplitude conversion component is realized through a programmable attenuator; the program control phase angle conversion component is realized by synthesizing a differential operation amplifying circuit, an integral operation amplifying circuit, a voltage follower and a program control gain circuit.
A power amplification unit: and amplifying the weak voltage signal output by the signal conditioning unit to a high voltage signal corresponding to the voltage measuring unit of the transformer comprehensive detection device through a high-accuracy voltage amplifying circuit.
For example, let the high-voltage side current output signal of the transformer comprehensive detection device be I, the high-voltage side voltage measurement signal be U, the load of the variable load box connected to the transformer comprehensive detection device be R, the program-controlled voltage amplitude transformation coefficient of the signal conditioning unit be k, and the phase angle transformation angle be
The gain of the power amplification unit is n. The load box output signal is IR; the signal conditioning unit outputs a signal of
The power amplifying unit outputs a signal of
I.e. the high-pressure side measuring signal of the integrated detection device
Therefore, the characteristic impedance of the transformer simulated by the on-site calibration device of the comprehensive transformer detection device is as follows:
through program control regulation of k, n, R,
And the parameters (specifically, the gain of the programmable control amplifier and the phase shift of the phase shifter can be adjusted by controlling the central processing unit) can simulate the characteristic parameters of the transformer insulation resistance, the winding direct-current resistance, the transformation ratio, the empty load loss and the like, and the field verification of the transformer comprehensive detection device is realized.
The invention adopts a virtual impedance method, can simulate the characteristic parameters of the power transformer such as insulation resistance, winding direct-current resistance, transformation ratio, empty load loss and the like only by changing the voltage and current functional relation of the input and output ports, is easy to realize program automation control, can realize the verification of various parameters by once wiring, and has high automation rate. The functional relation of the input and output signals can be configured in real time by software, and the universality is good. The calibration device realizes the functions of the acquisition, conditioning and output parts through modular design, and core components influencing the calibration performance work under the virtual power, so that the calibration device has less heat productivity and good stability.
Example two
The present embodiment aims to provide a field calibration method for a transformer comprehensive detection device, including:
simulating characteristic parameters of the power transformer by changing the amplitude and phase function relationship between the high-voltage standard voltage signals and the low-voltage standard voltage signals and the high-voltage side current output signals and the low-voltage side current output signals of the transformer comprehensive detection device;
and carrying out integrated on-site verification on the measurement performance of the transformer comprehensive detection device based on the simulated characteristic parameters of the power transformer.
The simulated characteristic parameters of the power transformer comprise insulation resistance of the power transformer, direct-current resistance of a winding, transformation ratio and empty load loss.
As an embodiment, the simulating characteristic parameters of the power transformer may further include: and switching the load connected to the transformer comprehensive detection device according to different measurement items and measurement points of the transformer comprehensive detection device, and simulating typical load points of the transformer.
As an embodiment, the simulating characteristic parameters of the power transformer may further include:
the proportional coefficient of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the comprehensive detection device of the regulating transformer realizes wide-range simulation of the resistance characteristic parameters, and the resistance characteristic parameters comprise: insulation resistance and winding direct current resistance of the power transformer;
and adjusting the phase angle of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the transformer comprehensive detection device to realize the simulation of impedance characteristic parameters, wherein the impedance characteristic parameters comprise transformation ratio and empty load loss.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a transformer integrated detection device on-spot check-up system which characterized by includes:
the device comprises a variable load box, a signal conditioning unit and a power amplifying unit;
the high-voltage side and low-voltage side three-phase current output terminals of the transformer comprehensive detection device are respectively connected with the variable load box;
the variable load box converts the received current signal into a reference voltage signal and transmits the reference voltage signal to the signal conditioning unit;
the signal conditioning unit is used for adjusting the amplitude and the phase of the reference voltage signal and transmitting the reference voltage signal to the power amplifying unit;
the power amplification unit is used for carrying out power amplification on the conditioned signal, outputting a high-voltage standard voltage signal and a low-voltage standard voltage signal, and returning the high-voltage standard voltage signal and the low-voltage standard voltage signal to a three-phase high-voltage side and low-voltage side voltage measurement input terminal of the transformer comprehensive detection device;
and the parameters of the variable load box, the signal conditioning unit and the power amplification unit are regulated in a program-controlled manner, the relevant characteristic parameters of the transformer are simulated, and the field verification of the comprehensive detection device of the transformer is carried out.
2. The on-site calibration system for the comprehensive transformer inspection device as claimed in claim 1, wherein the variable load box is used for simulating a typical load of the transformer and absorbing the power of the comprehensive transformer inspection device.
3. The field calibration system of the transformer comprehensive detection device according to claim 1 or 2, wherein the variable load box comprises a plurality of standard power resistor assemblies and a program-controlled switch array;
the resistance value and the power index of each standard power resistor component respectively correspond to the upper limit and the lower limit of the measurement range of the insulation resistance, the winding direct-current resistance, the transformation ratio and the empty load loss of the transformer comprehensive detection device;
and the program control switch array switches and accesses each standard power resistance component corresponding to the measurement range and the upper and lower limits of the power index of the transformer comprehensive detection device according to the difference of the measurement items and the measurement points of the transformer comprehensive detection device to simulate the typical load points of the transformer.
4. The field calibration system of the transformer integrated detection device according to claim 1, wherein the signal conditioning unit comprises a programmable voltage amplitude transformation component and a programmable phase angle transformation component;
the program-controlled voltage amplitude conversion assembly is used for adjusting the proportional coefficient of voltage measurement signals at the high-voltage side and the low-voltage side of the transformer comprehensive detection device and current output signals, and carrying out wide-range simulation on the resistance characteristic parameters of the power transformer;
the program-controlled phase angle conversion component is used for adjusting phase angles of voltage measurement signals and current output signals of high-voltage and low-voltage sides of the transformer comprehensive detection device and simulating impedance characteristic parameters.
5. The on-site calibration system for the transformer comprehensive detection device according to claim 1 or 4, wherein the programmable voltage amplitude transformation component is realized by a programmable attenuator;
the program control phase angle conversion component is realized by synthesizing a differential operation amplifying circuit, an integral operation amplifying circuit, a voltage follower and a program control gain circuit.
6. The on-site calibration system for the transformer integrated detection device as claimed in claim 1, wherein the power amplification unit utilizes a high-accuracy voltage amplification circuit to amplify the weak voltage signal outputted from the signal conditioning unit to the high voltage signal corresponding to the voltage measurement unit of the transformer integrated detection device.
7. The on-site calibration system for the transformer comprehensive detection device as claimed in any one of claims 1 to 6, wherein an externally connected interface of the calibration system is consistent with the transformer comprehensive detection device.
8. A field calibration method for a transformer comprehensive detection device is characterized by comprising the following steps:
simulating characteristic parameters of the power transformer by changing the amplitude and phase function relationship between the high-voltage standard voltage signals and the low-voltage standard voltage signals and the high-voltage side current output signals and the low-voltage side current output signals of the transformer comprehensive detection device;
and carrying out integrated on-site verification on the measurement performance of the transformer comprehensive detection device based on the simulated characteristic parameters of the power transformer.
9. The field calibration method for transformer comprehensive testing device according to claim 8, wherein the simulated characteristic parameters of the power transformer include insulation resistance, winding DC resistance, transformation ratio and empty load loss of the power transformer.
10. The field calibration method for the transformer comprehensive detection device according to claim 8, wherein the step of simulating the characteristic parameters of the power transformer further comprises the following steps: switching loads connected to the transformer comprehensive detection device according to different measurement items and measurement points of the transformer comprehensive detection device, and simulating typical load points of the transformer; or
Still include when simulating power transformer characteristic parameter:
the proportional coefficient of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the comprehensive detection device of the regulating transformer realizes wide-range simulation of the resistance characteristic parameters, and the resistance characteristic parameters comprise: insulation resistance and winding direct current resistance of the power transformer;
and adjusting the phase angle of the voltage measurement signal and the current output signal of the high-voltage side and the low-voltage side of the transformer comprehensive detection device to realize the simulation of impedance characteristic parameters, wherein the impedance characteristic parameters comprise transformation ratio and empty load loss.
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| CN115902480A (en) * | 2022-11-29 | 2023-04-04 | 西安西电电力电容器有限责任公司 | Integrated power capacitor test loop and tuning method thereof |
| CN117058955A (en) * | 2023-08-16 | 2023-11-14 | 艾伦科技(广州)有限公司 | Driving motor practical training teaching system and method for new energy automobile |
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