Maintenance of the transformer core and winding method
2019 - maintenance of the transformer core and winding method
30 15:05:13 a, for the maintenance of transformer core: 1, the removal of iron core, and the oil in oil duct.
2, check whether the core is close, neat, grounding copper reliable grounding, silicon steel sheet coating in good condition, colors do you have any abnormal, iron core and coil oil duct was clear, the bottom of the core balance shim insulating liner is complete, if there is loose phenomenon.
3 check the iron yoke clamp and wear heart bolt insulation condition.
Transformer, iron yoke clamp and wear heart bolt setting and core grounding.
Measurement, need to remove the grounding copper, iron yoke and examine whether the wear heart bolt looseness, with 2500 v megohmmeter measure iron yoke clamp and wear bolt to ground insulation resistance of the heart and the core of the insulation resistance to ground, its value shall be above 300 m.
If the insulation resistance is very low, should replace the clip pieces of insulation board and insulation paper tube wear heart bolt.
Second, the maintenance of the transformer winding: 1, the removal of winding line of oil.
2, check whether the winding is loose, deformation or displacement occurs, winding gasket between whether firm, clip pieces are in good condition.
3, check whether the winding is aging.
With the hand press winding, obvious crack, fall off and damage, if any, insulation aging, insulation treatment must be conducted.
4, check whether there is any knot on the lead wire winding and bending phenomenon, whether strict, wrapped, welding are in good condition, with tap-changer and casing connection is correct, close together, lead the electric distance conform to requirements.
5, check the winding insulation resistance will be affected with damp be affected with damp or have a short circuit phenomenon.
Such as insulation resistance does not conform to the requirements, rewind or replace winding.
6, check the winding dc resistance to determine if there is a short circuit or open circuit phenomenon winding.
Such as dc resistance does not conform to the requirements, rewind or replace winding.