Method for testing short-time breakdown of insulating medium of magnetic part under high-frequency square waves and sinusoidal voltage
A technology of insulating medium and sinusoidal voltage, applied in chemical instruments and methods, testing circuits, testing dielectric strength, etc.
Inactive Publication Date: 2020-10-02
XI AN JIAOTONG UNIV
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[0004] Aiming at the basic problem of high-frequency transformer insulation design in the current large-capacity power electronic transformer, the present invention proposes a test method for short-time breakdown of the insulation medium of the magnetic parts of the high-frequency transformer. The changing law of the magnetic field, especially the influence of frequency and temperature; on the other hand, it provides data analysis for the short-term failure of magnetic parts, and provides an important experimental basis for the insulation design of high-frequency transformers
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[0034] The technical solution and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for better understanding the specific implementation method of the technical solution, and they should not be construed as limiting the present invention. The invention proposes a short-term breakdown test method for the insulating medium of high-frequency transformer magnetic parts under typical working conditions. The ambient temperature is adjustable, and the short-time breakdown characteristics of the insulating medium are analyzed by adding the breakdown moment voltage and current. The schematic diagram of the short-time breakdown test platform is as follows: figure 1 As shown, it mainly includes high-voltage power supply, test unit, detection and acquisition unit and control unit. The high-voltage power supply includes a power amplifier and a high-frequency step-up transformer...
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Abstract
The invention discloses a method for testing short-time breakdown of an insulating medium of a magnetic part under high-frequency square waves and sinusoidal voltage. A high-frequency transformer is generally cast by epoxy resin, and high-frequency non-sinusoidal voltage, current and high-temperature environments can cause insulation breakdown. The method mainly comprises the following contents: an insulation short-time breakdown test platform under a high-frequency electric field is established by considering typical working conditions of a high-frequency transformer; the test platform comprises a high-voltage power supply, a test unit, a detection / acquisition unit and a control unit, and can realize the highest 10kV square wave and sinusoidal voltage, the frequency is up to 10kHz, and the highest temperature is 200 DEG C; according to test requirements, a method for testing the breakdown voltage and current of an insulating medium under a high-frequency square wave voltage is provided; a high-voltage differential probe and a high-frequency current probe are used for detecting the voltage and the current, an oscilloscope is used for collecting breakdown instantaneous voltage and current by setting breakdown triggering conditions, and a breakdown field intensity calculation method is provided; and the frequency and the voltage rise rate are controlled through a software interface, and short-time breakdown test is realized.
Description
technical field [0001] The invention relates to a short-time breakdown test method for an insulating medium of a magnetic part under high-frequency square wave and sinusoidal voltage, and belongs to the field of electrical equipment and electrical engineering. Background technique [0002] Due to the rapid development of renewable energy and distributed generation, power electronic transformers have received more and more attention. As the core component of power electronic transformer, high-frequency transformer plays the role of voltage isolation and energy exchange. Its design, development and performance stability are directly related to the safe and stable operation of the entire system. High frequency transformer is a special transformer with high frequency and high power density. When the capacity and voltage level are the same, the high-frequency transformer is much smaller than the traditional power transformer. In addition, in the operating condition of the power...
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Login to View More IPC IPC(8): G01R31/12G01R31/14B01L7/00
CPCB01L7/00G01R31/1263G01R31/14
Inventor 王威望王鑫何杰峰刘莹郭志强李欣原
Owner XI AN JIAOTONG UNIV