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Construction method for heating ultra-high voltage transformer oil with low-frequency current short circuit method

A technology of transformer oil and low-frequency current, applied in the direction of transformer/inductor cooling, etc., can solve the advantages of reducing the efficiency and speed of heating transformer by short-circuit method, high working voltage of power-frequency current short-circuit heating device, complicated transportation, installation, and layout, etc. problems, to avoid long-term on-duty, shorten the heating time, and reduce the on-site workload.

Inactive Publication Date: 2016-10-12
TIANJIN ELECTRIC POWER TRANSMISSION & TRANSFORMATION ENG CORP +1
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Problems solved by technology

However, the power frequency current short-circuit heating device has high working voltage, many components, large volume and weight, complicated transportation, installation and layout, and is extremely inconvenient to use on the substation site, which reduces the advantages of high efficiency and rapid heating of transformers by short-circuit method

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  • Construction method for heating ultra-high voltage transformer oil with low-frequency current short circuit method
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  • Construction method for heating ultra-high voltage transformer oil with low-frequency current short circuit method

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0048] A construction method for heating ultra-high voltage transformer oil by low-frequency current short-circuit method, see attached figure 1 In the wiring method shown, the basic principle of the short-circuit method is to short-circuit the winding on one side of the converter transformer (usually the winding on the valve side), and apply an AC voltage from the winding on the other side (usually the winding on the grid side), so that current flows through the winding (should be control not to exceed its rated current), so that the inside of the winding heats up, and the insulation of the transformer body is evenly heated to the specified temperature from the inside, and then vacuumized and hot oil...

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Abstract

The invention relates to a construction method for heating ultra-high voltage transformer oil with a low-frequency current short circuit method. According to the method, the ultra-high voltage transformer oil is heated by using the low-frequency current short-circuit method, the working voltage of short circuit heating is reduced by reducing the inductive impedance of a transformer winding so as to shorten temperature rise time and drying treatment time, and research achievements are applied to ultrahigh and extra-high voltage transformer fields to reach the effects of heating and drying the transformer oil. The interior of the winding is heated, an insulator of a transformer body is uniformly heated to an appointed temperature internally, and then moisture inside the insulator is taken out through vacuum pumping and hot-oil circulation treatment, so that a drying effect is reached. According to the short circuit method, the winding is heated from the interior of the body, so that the efficiency can be improved, the heating time is shortened, and the drying effect of the body is superior to an ordinary hot-oil circulation effect. Used equipment and wiring are completely the same as those of a transformer load test.

Description

technical field [0001] The invention mainly belongs to the technical field of ultra-high voltage construction transformers, in particular to a construction method for heating ultra-high voltage transformer oil by a low-frequency current short-circuit method. Background technique [0002] The transformer is one of the most important equipment in the construction of the UHV power grid, and it is also the core of the operation of the entire power grid. The transformer oil in the body has the functions of cooling, insulation and arc suppression, which is of great importance to the stability of the transformer and the entire power system. important influence. In 2009, the China Electric Power Research Institute successfully developed a power frequency current short-circuit heating device and successfully applied it to the drying treatment of 750kV AC transformers after being damped on site and the heating and drying of ±800kV converter transformers during on-site installation. H...

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Application Information

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IPC IPC(8): H01F27/14
CPCH01F27/14
Inventor 曹正郭丽君薛焕珍方志伟王靖庞剑祝婷
Owner TIANJIN ELECTRIC POWER TRANSMISSION & TRANSFORMATION ENG CORP
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