High-frequency harmonic electrothermal aging test system for cable terminal
A cable termination and aging test technology, applied in the field of power cables, can solve the problems of inadequate aging simulation of cable terminations and inability to accurately reflect the aging process of cable terminations.
Pending Publication Date: 2020-11-03
THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST
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Problems solved by technology
The existing technology cannot make the cable terminal bear the effect of high-frequency harmonics in the test, the aging simulation of the cable terminal is not in place, and the aging process of the cable terminal cannot be accurately reflected
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[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0023] ginseng figure 1 As shown, this embodiment provides a cable terminal high-frequency harmonic electrothermal aging test system, including a high-frequency high-voltage generating device and a power frequency high-voltage generating device; The two sides of the sample 31 are used to generate high-frequency high voltage and power frequency high voltage respectively, which are superimposed on the cable terminal sample 31 to simulate the harmonic voltage waveform of the real power grid, and conduct electrothermal aging tests on the cable terminal.
[0024] In the present embodiment, the high-frequency high-voltage generating device includes a high-frequency signal gener...
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The invention relates to a high-frequency harmonic electrothermal aging test system for a cable terminal. The system comprises a high-frequency high-voltage generation device and a power-frequency high-voltage generation device, wherein the high-frequency high-voltage generation device and the power-frequency high-voltage generation device are respectively arranged at two sides of the cable terminal sample and are used for respectively generating high-frequency high voltage and power-frequency high voltage and generating superposition on the cable terminal sample so as to simulate harmonic voltage waveforms of a real power grid and carry out an electric heating aging test on the cable terminal. According to the invention, the high-frequency harmonic component is introduced into the testedcable terminal while the high-frequency high voltage and the large current are applied to the tested cable, so that the tested cable terminal bears the assessment of superposition of the power frequency voltage and the high-frequency voltage at the same time and is closer to the state of a power grid during operation, and the aging test can be effectively and accurately carried out on the cable terminal.
Description
technical field [0001] The invention belongs to the technical field of power cables, in particular to a high-frequency harmonic electrothermal aging test system for cable terminals. Background technique [0002] Power cables are widely used in urban power grids, and partial discharge is one of the main causes of cable insulation damage. Due to the complex insulation structure of the cable terminal, there are many reasons that affect its insulation performance, and it is usually made manually on site, and poor craftsmanship is likely to leave hidden troubles, so its failure rate is much higher than that of the cable body. Conducting electrothermal aging test on the cable terminal, its insulation defects are more likely to be exposed than the cable body, which has great practical significance. [0003] With the expansion of grid capacity, the complexity of user equipment increases, especially the use of some large-capacity and nonlinear loads, which leads to the prominent pro...
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IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 张浩然杨海超姚谦杨玉新吕楠金辰李哲任智刚
Owner THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST