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Annealing process of amorphous alloy transformer core

A technology of transformer iron core and annealing process, applied in the field of transformer manufacturing, can solve the problems of excessive iron loss excitation power and scrapped iron core, and achieve the effect of improving stability

Inactive Publication Date: 2012-09-19
中兆培基(北京)电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the only enterprise producing amorphous strips in China is restricted by the proportion of material components, and the material is greatly affected by temperature and humidity, so it is prone to iron loss and excitation power in the annealing process. If the phenomenon exceeds the standard, it is easy to cause scrapping of the iron core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This scheme mainly puts the core annealing furnace in a vacuum cover, so that the amorphous alloy core annealing furnace completes the entire annealing process in a vacuum environment. The annealing process is as follows:

[0024] a) Hang the formed iron cores into the annealing frame in sequence according to the size, and close the furnace door;

[0025] b) Lift the annealing furnace into the vacuum hood, close the vacuum hood and evacuate the inside of the vacuum hood;

[0026] c) Turn on the power, set the furnace temperature at 400°C, turn on the heating, and record the time and ambient temperature;

[0027] d) When the temperature of the first coil reaches 100°C, open the nitrogen control valve to fill the vacuum cover with nitrogen, and start recording the temperature of the test point every 15 minutes;

[0028] e) When the temperature of the first iron core reaches 200°C, turn on the magnetic current;

[0029] f) When more than 50% of the iron core temperature...

Embodiment 2

[0035] The scheme of this embodiment mainly puts the iron core annealing furnace in a vacuum cover, so that the amorphous alloy iron core annealing furnace completes the entire annealing process in a vacuum environment. The annealing process is as follows:

[0036] a) Hang the formed iron cores into the annealing frame in sequence according to the size, and close the furnace door;

[0037] b) Lift the annealing furnace into the vacuum hood, close the vacuum hood and evacuate the inside of the vacuum hood;

[0038] c) Turn on the power, set the furnace temperature at 390°C, turn on the heating, and record the time and ambient temperature;

[0039] d) When the temperature of the first coil reaches 100°C, open the nitrogen control valve to fill the vacuum cover with nitrogen, and start recording the temperature of the test point every 15 minutes;

[0040] e) When the temperature of the first iron core reaches 200°C, turn on the magnetic current;

[0041] f) When more than 50% ...

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Abstract

The invention discloses an annealing process of an amorphous alloy transformer core. The process comprises hanging a formed core on an annealing stand, and closing a furnace door; hanging an annealing furnace in a vacuum hood, closing the vacuum hood, and vacuuming the vacuum hood; powering on the annealing furnace, starting heating, and recording time and an ambient temperature; filling nitrogen gas in the vacuum hood, starting recording temperatures of tested points, and recording once every 15min; turning on a magnetization current; holding at the temperature for 40-75min when the temperatures of at least 50% of the tested points reach 370-380 DEG C; closing a nitrogen gas controlling valve, and opening the furnace door; and taking out the core by using a forklift, and finishing. The invention effectively solves the annealing problem of cores, effectively controls two critical parameters of core loss and excitation power of cores, and greatly improves core annealing stability.

Description

technical field [0001] The invention relates to the field of transformer manufacturing, in particular to an annealing method for an amorphous alloy transformer iron core. Background technique [0002] The SBH15 amorphous alloy transformer produced by the applicant is currently the most energy-saving and environment-friendly distribution transformer in China, and its iron core is mainly made of amorphous alloy strip. During the manufacturing process, the iron core must go through an annealing process before it can be used. At present, the only enterprise producing amorphous strips in China is restricted by the proportion of material components, and the material is greatly affected by temperature and humidity, so it is prone to iron loss and excitation power in the annealing process. If the phenomenon exceeds the standard, it is easy to cause the iron core to be scrapped. [0003] The present invention is proposed aiming at the above-mentioned deficiencies existing in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/00
Inventor 顾建伟洪春耕王磊李辛
Owner 中兆培基(北京)电气有限公司
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