Intelligent non-partial discharge extra-high voltage sine-wave modulation pressure-resistant apparatus

Abstract

Te invention relates to an intelligent type partial discharge-free ultrahigh voltage sine wave modulation voltage resistance device. The device comprises a frequency conversion power unit, a middle excitation boosting transformer and a serial resonant circuit which are sequentially connected in series; the frequency conversion power unit commutates and inverts 380V triphase current, obtains and outputs single-phase frequency-adjustable alternating current, and the 380V triphase current is boosted to 1kV around by the middle excitation boosting transformer; the output of the middle excitation boosting transformer is connected with the serial resonant circuit; the serial resonant circuit comprises a resonant reactor L1 and a voltage divider; a capacitor Cx of a tested article and the voltage divider are in parallel connection; a secondary end of the voltage divider is connected with a high voltage measuring meter and a protection device respectively; and the high voltage measuring meter and the protection device are connected with feedback ends of the frequency conversion power unit. The device is the intelligent type partial discharge-free ultrahigh voltage sine wave modulation voltage resistance device which has a simple and compact structure, simple operation and wide application range, can meet requirements of voltage resistance and partial discharge test of ultrahigh voltage electric equipment.

Description

technical field [0001] The invention mainly relates to the field of high-voltage test devices, in particular to an intelligent non-partial discharge UHV sine wave modulation withstand voltage device. Background technique [0002] At present, only Russia and Japan have built 1000KV UHV AC power transmission projects in the world, but there are still few test devices for on-site equipment withstand voltage. In my country, the first 1,000 kV Jindongnan-Nanyang-Jingmen UHV AC test and demonstration project transmission line project in Asia started foundation construction on June 28, 2007; the iron tower assembly construction was completed at the end of April 2008, and completed in mid-August The construction task of ground wire and OPGW optical cable tension erection and accessories installation project. [0003] In foreign countries, the partial discharge test power supply equipment used for transformers is separated from the AC withstand voltage test power supply equipment. T...

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Problems solved by technology

The device is heavy and difficult to maintain, it is only suitable for use in the test hall, not suitable for field tests

[0004] In the 1980s, most of the domestic test power sources used frequency conversion of intermediate frequency generator sets. In 1990, resonant power supply devices were used. Most of them adopted PWM modulation to generate sine waves with adjustable frequency. typical interference, this device is therefore not suitable for partial discharge tests

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