Teach you how to analyze two phenomena of transformer faults
Release time:
2021-09-10 15:16
Source:
This article judges whether there are abnormalities by observing changes in external conditions and other phenomena during the operation of the transformer, analyzing the causes, locations, and degrees of abnormal operation. Below, two abnormal situations are used as examples to explain what the problems are.
Abnormalities on the surface of the transformer:
1. The rupture of the explosion-proof membrane of the explosion-proof tube causes water and moisture to enter the transformer, leading to oil emulsification and a decrease in the insulation strength of the transformer. The reasons include:
(1) Improper selection and treatment of the material of the explosion-proof membrane and glass.
(2) The processing of the explosion-proof membrane and flange is not precise and flat, and the installation process does not meet the requirements.
(3) Impact from external forces or natural disasters.
(4) Internal short circuit failure of the transformer.
2. Bushing flashover discharge
Bushing flashover discharge can cause heating leading to aging, insulation damage, and even explosions. Common causes include:
(1) The surface of the bushing is too dirty or not smooth.
(2) Poor manufacturing of high-voltage bushings, lack of shielding grounding, and poor welding leading to insulation damage.
Secondly, abnormal color and odor:
Internal faults of the transformer and overheating of various components will cause a series of changes in color and odor.
(1) Overheating at wire ends or wire clamps, oxidation of contact surfaces, causing discoloration and strange odors.
(2) Contamination of bushings and porcelain bottles causing corona and flashover, and burning of fans and oil pumps can produce foul odors.
(3) Silica gel in the breather absorbs moisture and changes color.
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