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Vacuum drying method for power transformer body

A technology for power transformers and vacuum drying, which is applied in the manufacture of inductors/transformers/magnets, drying solid materials, and drying solid materials with a combination of methods. problems, achieve high drying efficiency, improve electrical insulation strength and product quality, and shorten drying time

Inactive Publication Date: 2013-11-13
JIANGSU HENGTE GRP VALTTE ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional drying technology has low heating temperature, unevenness, and long processing time, and it is still unable to deal with transformers with serious water ingress and dampness; the drying effect is often not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: a transformer with a voltage below 10KV and a capacity of 500Kva or below;

[0013] A vacuum drying treatment method for a power transformer body, comprising the following steps:

[0014] (1) Heating and preheating treatment: open the steam valve of the heating exhaust pipe to make the temperature in the tank rise evenly, the heating rate is 15°C / h, the heating time is 1h, and the furnace temperature is controlled to 100°C;

[0015] (2) In the step (1), pump a vacuum every hour, the vacuum degree is 0.04Mpa, keep it for 10 minutes, then release the vacuum and continue heating, the purpose of doing this is to prevent the iron core from rusting;

[0016] (3) After the preheating is completed, reduce the pressure in the vacuum tank evenly and step by step, the vacuum degree is 0.02Mpa, and maintain for 1h;

[0017] (4), uniformly reduce the vacuum degree to 1.33×10 3 pa, continue vacuuming until no condensed water is released from the condenser for 3 hours;...

Embodiment 2

[0019] Embodiment 2: a transformer with a voltage below 10KV and a capacity of 1000Kva;

[0020] A vacuum drying treatment method for a power transformer body, comprising the following steps:

[0021] (1) Heating preheating treatment: open the steam valve of the heating exhaust pipe to make the temperature in the tank rise evenly, the heating rate is 15°C / h, the heating time is 4h, and the furnace temperature is controlled at 105°C;

[0022] (2), in the step (1), vacuum once an hour, the vacuum degree is 0.04Mpa, maintain for 13min, then remove the vacuum and continue heating;

[0023] (3) After the preheating is completed, reduce the pressure in the vacuum tank evenly and step by step, the vacuum degree is 0.04Mpa, and maintain for 1.5h;

[0024] (4), uniformly reduce the vacuum degree to 1.33×10 3 pa, continue vacuuming until no condensed water is released from the condenser for 3 hours;

[0025] (5) Stop heating, release the vacuum, open the tank door, and prepare for th...

Embodiment 3

[0026] Embodiment three: a transformer with a voltage below 10KV and a capacity of 2500Kva;

[0027] A vacuum drying treatment method for a power transformer body, comprising the following steps:

[0028] (1) Heating and preheating treatment: open the steam valve of the heating exhaust pipe to make the temperature in the tank rise evenly, the heating rate is 15°C / h, the heating time is 6h, and the furnace temperature is controlled to 110°C;

[0029] (2) In the step (1), vacuumize once an hour, the vacuum degree is 0.04Mpa, maintain for 15min, then remove the vacuum and continue heating;

[0030] (3) After the preheating is completed, reduce the pressure in the vacuum tank evenly and step by step, the vacuum degree is 0.05Mpa, and maintain it for 2h;

[0031] (4), uniformly reduce the vacuum degree to 1.33×10 3 pa, continue vacuuming until no condensed water is released from the condenser for 3 hours;

[0032] (5) Stop heating, release the vacuum, open the tank door, and pre...

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Abstract

The invention relates to the technical field of transformer vacuum drying, in particular to a vacuum drying method for a power transformer body. The method comprises the following steps of (1), warming preheating processing: opening a steam valve of a heating calandria and warming the interior of a tank to enable the temperature to rise evenly, wherein the warming speed is 15 DEG C per hour, the warming time is 1-6 hours, and the furnace temperature is controlled to be 100-110 DEG C; (2), vacuumizing once per hour in the step (1), keeping the vacuum degree of 0.04 Mpa for 10-15 minutes, and stopping the vacuumizing and continuously heating; and (3) uniformly reducing the pressure in the vacuum tank evenly level by level after the preheating is finished, and keeping the vacuum degree of 0.02-0.05Mpa for 1-2 hours. According to the vacuum drying method for the power transformer body, vacuum drying processing is performed on the transformer body by heating a vacuum drying system, the drying time is short, the drying efficiency is high, the drying effect is good, and the electrical insulation strength and the product quality are effectively improved.

Description

technical field [0001] The invention relates to the technical field of transformer vacuum drying, in particular to a vacuum drying treatment method for a power transformer body. Background technique [0002] As we all know, there are many solid insulating materials distributed on the body of the transformer, such as inter-turn insulation of coils, stays, pads, laminated cardboard pressure rings and cardboard tubes, etc. These insulating materials are all made of fibrous insulating materials. One of the inherent characteristics of insulating materials is that after being damp or soaked, it will seriously affect the electrical strength, dielectric loss and water content of the material medium. Therefore, the assembled new transformer must be dried before leaving the factory to remove the moisture and gas in the insulating material, so that the moisture content can be controlled within the required range, so as to ensure that the transformer has sufficient insulation strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/00F26B7/00
Inventor 吴爱国胡斌康
Owner JIANGSU HENGTE GRP VALTTE ELECTRIC
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