CN-121978608-A - Device and method for testing broadband transfer characteristics of vehicle-mounted voltage transformer

CN121978608ACN 121978608 ACN121978608 ACN 121978608ACN-121978608-A

Abstract

The invention discloses a device and a method for testing broadband transfer characteristics of a vehicle-mounted voltage transformer, which belong to the technical field of voltage transformer transfer characteristic testing, wherein the method comprises a signal main control unit, a signal processing unit and a signal processing unit, wherein the signal main control unit is used for generating amplified square pulse signals and injecting the amplified square pulse signals into the voltage transformer; the system comprises a voltage transformer, a voltage signal acquisition and storage unit, a signal processing unit and a control unit, wherein the voltage signal acquisition and storage unit is used for acquiring and storing voltage waveforms of a primary side and a secondary side of the voltage transformer, and the signal processing unit is used for obtaining broadband transmission characteristics of the voltage transformer by utilizing an impulse response method principle according to the voltage waveforms of the primary side and the secondary side of the voltage transformer. The invention solves the problem that the broadband transfer characteristic of the vehicle-mounted voltage transformer is difficult to master.

Inventors

ZHANG JIALE
WU YAN
LIU ZHENGWEI
HA DALEI
WANG QINGFENG

Assignees

中车长春轨道客车股份有限公司
西南交通大学

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (9)

1. The utility model provides a testing arrangement of on-vehicle voltage transformer broadband transfer characteristic which characterized in that includes: The signal main control unit is used for generating amplified square pulse signals and injecting the amplified square pulse signals into the voltage transformer; The voltage signal acquisition and storage unit is used for acquiring and storing voltage waveforms of the primary side and the secondary side of the voltage transformer; and the signal processing unit is used for obtaining the broadband transmission characteristic of the voltage transformer by utilizing the impulse response method principle according to the voltage waveforms of the primary side and the secondary side of the voltage transformer.
2. The device for testing broadband transmission characteristics of a vehicle-mounted voltage transformer according to claim 1, wherein the signal main control unit comprises: The pulse signal generation module is used for generating square pulse signals with different pulse widths; And the signal amplifying module is used for amplifying the square pulse signal and injecting the amplified signal into the primary side of the voltage transformer through the coaxial cable.
3. The device for testing broadband transmission characteristics of a vehicle-mounted voltage transformer according to claim 2, wherein the square pulse signal has the following expression: Wherein, the Is that Square pulse signal value of moment; Time is; Is a step function; Is the signal period.
4. The device for testing broadband transfer characteristics of a vehicle-mounted voltage transformer according to claim 1, wherein the voltage signal acquisition and storage unit comprises: the primary side signal acquisition module of the voltage transformer is used for acquiring the voltage waveform of the primary side of the voltage transformer; The secondary side signal acquisition module of the voltage transformer is used for acquiring the voltage waveform of the secondary side of the voltage transformer; and the signal storage module is used for storing the voltage waveform of the primary side of the voltage transformer and the voltage waveform of the secondary side of the voltage transformer.
5. The device for testing the broadband transmission characteristics of the vehicle-mounted voltage transformer according to claim 4, wherein the primary side signal acquisition module of the voltage transformer and the secondary side signal acquisition module of the voltage transformer have the same circuit structure and comprise a resistance-capacitance voltage dividing circuit and a voltage follower circuit connected with the resistance-capacitance voltage dividing circuit.
6. The device for testing broadband transfer characteristics of the vehicle-mounted voltage transformer according to claim 5, wherein the resistor-capacitor voltage divider circuit comprises a voltage acquisition port P1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C8, an interface 1 of the voltage acquisition port P1 is respectively connected with one end of the resistor R1 and one end of the capacitor C1, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the capacitor C1 is connected with one end of the capacitor C2, the other end of the resistor R2 is connected with one end of the resistor R3, the other end of the capacitor C2 is connected with one end of the capacitor C3, the other end of the resistor R3 is connected with one end of the resistor R4, the other end of the capacitor C4 is respectively connected with one end of the capacitor C4, the other end of the resistor R5, one end of the capacitor C6, the other end of the capacitor C6, the capacitor C7 of the capacitor C6 and the other end of the capacitor C5 are respectively connected with one end of the resistor R5, the other end of the capacitor C6 and the capacitor C8 is connected with one end of the resistor C5, and the other end of the resistor C6 is connected with one end of the resistor C6, and the other end of the resistor C8 is connected with one end of the resistor C6.
7. The device for testing the broadband transfer characteristic of the vehicle-mounted voltage transformer according to claim 5, wherein the voltage follower circuit comprises an integrated operational amplifier chip, a power circuit source, a power interface P2, a coaxial connector RF1, a resistor R7, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C12, the non-inverting input end of the integrated operational amplifier chip is connected with the other end of a resistor R6 of a resistor-capacitor voltage divider circuit, the positive power supply end of the integrated operational amplifier chip is respectively connected with one end of the capacitor C9, one end of the capacitor C10 and an interface 3 of the power circuit source, the other end of the capacitor C9, the other end of the capacitor C10 and an interface 4 of the power circuit source are grounded, an interface 1 of the power circuit source is connected with an interface 2 of the power interface P2, an interface 2 of the power circuit source is connected with an interface 1 of the power interface P2, an interface 5 of the power circuit source is respectively connected with one end of the capacitor C11, one end of the capacitor C12 and a negative power supply end of the integrated operational amplifier chip, the other end of the coaxial connector is respectively connected with an interface 1 of the coaxial connector RF1, and the other end of the coaxial connector R7 and the coaxial connector RF1 are respectively connected with the coaxial connector 1 and the other end of the interface 1 and the coaxial connector RF 1.
8. A method for testing broadband transfer characteristics of a vehicle-mounted voltage transformer using the testing apparatus for broadband transfer characteristics of a vehicle-mounted voltage transformer according to any one of claims 1 to 7, comprising: the method comprises the steps of connecting a testing device of broadband transmission characteristics of a vehicle-mounted voltage transformer to a vehicle-mounted voltage transformer circuit to be tested; The main control unit injects the amplified square pulse signal to the primary side of the voltage transformer through the coaxial cable; and the signal processing unit obtains the broadband transmission characteristic of the voltage transformer by utilizing the impulse response method principle according to the voltage waveforms of the primary side and the secondary side of the voltage transformer.
9. The method for testing broadband transfer characteristics of a vehicle-mounted voltage transformer according to claim 8, wherein the expression of the broadband transfer characteristics of the voltage transformer is: Wherein, the Is a transfer characteristic; is an imaginary unit; is angular frequency; the frequency characteristic is obtained by fast Fourier transform of the voltage waveform of the primary side of the voltage transformer; is the frequency characteristic obtained by the fast Fourier transform of the voltage waveform of the secondary side of the voltage transformer I is amplitude-frequency characteristic; Is the phase angle sign; is a phase frequency characteristic.

Description

Device and method for testing broadband transfer characteristics of vehicle-mounted voltage transformer Technical Field The invention belongs to the technical field of voltage transformer transfer characteristic testing, and particularly relates to a device and a method for testing broadband transfer characteristics of a vehicle-mounted voltage transformer. Background Along with the development of the science and technology level and the economical strength of China, the high-speed motor train unit plays an important role in people's travel, so that the safe, stable and on-time operation of the motor train unit is particularly important. The vehicle-mounted voltage transformer is important high-voltage electrical equipment on the high-speed motor train unit, and achieves the functions of monitoring the traction network voltage, measuring the electric energy and the like. When overvoltage occurs in the motor train unit, the overvoltage on the primary side of the voltage transformer contains a large number of high-frequency components. Due to the influence of the distribution parameters of the voltage transformer, under the high-frequency condition, the amplitude relation between the primary side and the secondary side of the voltage transformer is no longer a linear relation of a rated transformation ratio, the transformation ratio of the linear relation is changed along with the change of frequency, and the characteristic tends to cause the secondary side of the transformer to generate distortion when the broadband waveform is transmitted, so that the actual waveform of the primary side cannot be accurately reflected. Therefore, when overvoltage occurs in the motor train unit, primary side overvoltage directly obtained according to the transformation ratio relation of the voltage transformer is inaccurate. At present, an effective means for testing the broadband transfer characteristic of the vehicle-mounted voltage transformer of the motor train unit is not available, and the broadband transfer characteristic of the vehicle-mounted voltage transformer is difficult to master, so that a device and a method for testing the broadband transfer characteristic of the vehicle-mounted voltage transformer are needed to test the broadband transfer characteristic of the vehicle-mounted voltage transformer. Disclosure of Invention Aiming at the defects in the prior art, the device and the method for testing the broadband transmission characteristics of the vehicle-mounted voltage transformer solve the problem that the broadband transmission characteristics of the vehicle-mounted voltage transformer are difficult to master. In order to achieve the aim of the invention, the technical scheme adopted by the invention is that the device for testing the broadband transmission characteristics of the vehicle-mounted voltage transformer comprises: The signal main control unit is used for generating amplified square pulse signals and injecting the amplified square pulse signals into the voltage transformer; The voltage signal acquisition and storage unit is used for acquiring and storing voltage waveforms of the primary side and the secondary side of the voltage transformer; and the signal processing unit is used for obtaining the broadband transmission characteristic of the voltage transformer by utilizing the impulse response method principle according to the voltage waveforms of the primary side and the secondary side of the voltage transformer. The invention has the advantages that the signal control unit can generate pulse signals with different pulse width directions, covers the frequency range from DC to 5MHz, can measure and obtain the broadband transmission characteristic of the voltage transformer, and because the pulse signals have high-frequency characteristics, the bandwidth of the signal acquisition module meets the pulse signal bandwidth in order to ensure that the pulse signals can be transmitted without distortion, the input impedance of the signal acquisition module is larger, the influence caused by introducing a measuring device can be reduced, the accurate secondary side voltage signal of the voltage transformer is acquired, and the accurate test of the broadband transmission characteristic of the DC-5MHz of the vehicle-mounted voltage transformer is realized. Further, the signal master control unit includes: The pulse signal generation module is used for generating square pulse signals with different pulse widths; And the signal amplifying module is used for amplifying the square pulse signal and injecting the amplified signal into the primary side of the voltage transformer through the coaxial cable. The further scheme has the advantages that the pulse signal generation module can flexibly adjust the pulse width of the square pulse signal to cover the frequency range from DC to 5MHz, the signal amplification module improves the signal amplitude, the coaxial cable ensures low-loss transmission, high-frequen