Method for oil injection of liquid immersed type distribution transformer

Abstract

The invention discloses a method for oil injection of a liquid immersed type distribution transformer. The method comprises the following steps: the first step of finishing assembly of a transformer which is to undergo oil injection, and carrying the transformer to a presoaking liquid area; the second step of immersing a transformer body in the first step in oil in the presence of air; the third step of carrying the transformer in the second step to the vacuum environment, performing vacuum-pumping treatment on a transformer oil tank on the required process conditions, maintaining the vacuum for a period of time when the vacuum degree reaches a set value; the fourth step of carrying the transformer in the third step to an injection area, and performing supplemented injection to the vacuumized oil tank in the air until the liquid fills the oil tank. According to the method for oil injection, first in the air the transformer oil tank is filled with oil, then the transformer is placed in a vacuum tank or a pouring tank to be vacuumized, finally liquid supplementing is performed, so that the air in the oil tank can be discharged thoroughly, and the performance of the transformer is guaranteed. According to the method for oil injection, the operation process is also greatly simplified, and the oil injection efficiency is improved.

Description

technical field [0001] The invention relates to an oil injection method for a liquid-immersed distribution transformer, which belongs to the field of power transformer manufacturing. Background technique [0002] At present, the liquid-immersed transformers on the market are filled with oil by vacuum oil injection. The vacuum oil injection method includes the following steps: (1) Lift the transformer to the vacuum oil injection room; (2) Place the oil injection pipe and fix it firmly, and place the oil level probe , close the door of the vacuum oiling chamber; (3) set the vacuum oiling parameters; (4) vacuumize according to the process requirements, when the vacuum degree reaches the set value, close the vacuum degree valve of the oil storage tank and the oiling chamber, and vacuum the oil in the oiling tank Keep the pressure for 15 minutes or more; (5) Open the corresponding oil injection pipeline valve and start vacuum oil injection; (6) Stop oil injection when the oil inj...

AI Technical Summary

Problems solved by technology

[0003] The oil injection process has high requirements on professional equipment, large investment, high requirements on the standard operation of operators, and complicated operation process

At the same time, it takes a long time to start vacuuming after filling the oil. After filling the oil, it needs to stand still for 12 hours before vacuuming. The required waiting time is long and the oil injection efficiency is low. The air is exhausted, which affects the quality of the transformer