CN103579927A - Large-scale transformer coil internal diameter side nondestructive maintenance method - Google Patents

Abstract

The invention discloses a large-scale transformer coil internal diameter side nondestructive maintenance method which comprises that a whole-phase transformer coil with oil is de-oiled and dried; temperature of the transformer coil is maintained to be not lower than 80 DEG C, and all insulating products of a coil internal diameter side are marked in turn according to coil gears; molded insulating cylinders are pulled out of the coil by using a hoisting tool, the rest insulating products are taken out in turn, and the insulating products after being taken out are placed in a drying room and maintained to be 90 DEG C; fault points of the coil internal diameter side are inspected and repaired; all the insulating products are installed back into the coil in turn according to marks and inside-and-outside orders, the molded insulating cylinders are arranged on the upper end of the coil internal diameter side, and a coil pressing disc with weight of three tons is adopted to press the molded insulating cylinders into the coil in place so that maintenance of the transformer coil internal diameter side is completed. Nondestructive maintenance of the transformer coil internal diameter side is performed by the maintenance method so that destructive scrapping of the coil insulating products is avoided, maintenance efficiency is effectively enhanced, maintenance cost is reduced and safe and reliable operation of a transformer is ensured.

Description

High-power transformer internal coil diameter side can't harm repair method

Technical field

The present invention relates to the harmless repair method of a kind of high-power transformer internal coil diameter side.

Background technology

In at present domestic and international Repair of Transformer industry, between high-power transformer internal coil diameter side cake or when turn-to-turn needs normal inspection maintenance, there is the difficult problem that cannot avoid, by conventional method, need destroy after the profiled insulation cylinder and multiple tracks insulation screen of transformer coil internal side diameter, can carry out inspection and the maintenance of transformer coil internal side diameter.This need spend a large amount of man power and materials, so generally when carrying out Repair of Transformer, do not do inspection and the maintenance of transformer coil internal side diameter, thereby transformer coil may exist certain hidden danger, has affected the safe and reliable operation of transformer.

High-power transformer coil is when checking and overhaul, as shown in Figure 1, because coil 7 internal side diameters have profiled insulation cylinder 6 and multiple tracks insulation screen 5 and various insulation molding part, there is inner bracing strip 1 in various insulation molding parts, outer stay 2, oil clearance stay 3 and oil channel cushion block 4 etc., generally when internal coil diameter side is short-circuited or during insulation harm, in order to repair coil internal side diameter fault, the profiled insulation cylinder 6 of internal coil diameter side and multiple tracks insulation screen 5 can only be carried out to cutting damage and scrap, then take out the profiled insulation cylinder 6 of coil 7 internal side diameters, multiple tracks insulation screen 5 Ji Ge insulation molding parts, carry out again transformer coil 7 internal side diameter inspection and maintenance.This conventional method makes a large amount of coils scrap with insulated product, and the cost of overhaul is high, and the repair time is tediously long; And because a large amount of insulated products needs through long-time making new product after scrapping, the physical dimension of insulated product after cutting disassembling changes, give definite difficulty of having brought of new product insulated product manufactured size, new product manufactured size is excessive or too smallly all cannot use, size too senior general cannot pack coil into, size is too little affects being inserted in of coil, so the situation that size that new product makes cannot meet the demands often occurs to be occurred and continues to scrap and reform, have a strong impact on the time between overhauls(TBO), cause huge direct and consequential damage.

Summary of the invention

Technical problem to be solved by this invention is to provide the harmless repair method of a kind of high-power transformer internal coil diameter side, utilize this repair method to implement the harmless maintenance of transformer coil internal side diameter, avoided the destructiveness of coil insulation goods to scrap, effectively improved overhaul efficiency, reduce the cost of overhaul, guaranteed the safe and reliable operation of transformer.

For solving the problems of the technologies described above, the harmless repair method of high-power transformer internal coil diameter side of the present invention comprises the steps:

Step 1, the whole phase transformer coil of band oil is placed in to the dry drying room of coal oil vapor-phase, and to carry out de-oiling dry, and de-oiling drying time is 48 hours, and temperature is 105 ℃;

Step 2, maintenance transformer coil temperature are not less than 80 ℃, and the dried coil of de-oiling is carried out successively to sign by coil gear in profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part;

Step 3, use profiled insulation cylinder hoisting tool special are extracted profiled insulation cylinder in coil, and multiple tracks insulation screen and various insulation molding part in coil are all taken out successively, the profiled insulation cylinder after taking-up, multiple tracks insulation screen and various insulation molding part put into drying room 90 ℃ of insulations;

Step 4, inspection and maintenance transformer coil internal side diameter, the fault point of repairing transformer coil internal side diameter;

Profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part in step 5, taking-up drying room, insulate screen and various insulation molding part of multiple tracks recovered to be installed in transformer coil by sign and inside and outside order successively, then profiled insulation cylinder is arranged to transformer coil internal side diameter upper end, adopt 3 tons of deadweights, diameter to be greater than the coil press mounting plane bottom plate of profiled insulation cylinder, be placed on profiled insulation cylinder, the deadweight of dependence chassis, slowly profiled insulation cylinder be pressed in transformer coil and put in place, completing the maintenance of transformer coil internal side diameter.

Because the harmless repair method of high-power transformer internal coil diameter side of the present invention has adopted technique scheme, the whole phase transformer coil that is about to band oil carries out de-oiling and is dried, and the time is 48 hours, and temperature is 105 ℃; Keep transformer coil temperature to be not less than 80 ℃, by coil gear, each insulated product of internal coil diameter side is carried out to sign successively; Adopt lifting device that profiled insulation cylinder is extracted in coil, and all the other insulated products are all taken out successively, the insulated product after taking-up is put into drying room 90 ℃ of insulations; Check the fault point of repairing coil internal side diameter; Each insulated product recovers to be installed in coil by sign and inside and outside order successively, then profiled insulation cylinder is located to internal coil diameter side upper end, adopts 3 tons heavy coil platens that profiled insulation cylinder is pressed in coil and is pressed into place, and completes the maintenance of transformer coil internal side diameter.This repair method is implemented the harmless maintenance of transformer coil internal side diameter, has avoided the destructiveness of coil insulation goods to scrap, and has effectively improved overhaul efficiency, has reduced the cost of overhaul, has guaranteed the safe and reliable operation of transformer.

Accompanying drawing explanation

Below in conjunction with drawings and embodiments, the present invention is described in further detail:

Fig. 1 is transformer coil schematic cross-section.

Embodiment

The harmless repair method of high-power transformer internal coil diameter side of the present invention comprises the steps:

Step 1, the whole phase transformer coil of band oil is placed in to the dry drying room of coal oil vapor-phase, and to carry out de-oiling dry, and de-oiling drying time is 48 hours, and temperature is 105 ℃;

Step 2, maintenance transformer coil temperature are not less than 80 ℃, and the dried coil of de-oiling is carried out successively to sign by coil gear in profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part;

Step 3, use profiled insulation cylinder hoisting tool special are extracted profiled insulation cylinder in coil, and multiple tracks insulation screen and various insulation molding part in coil are all taken out successively, the profiled insulation cylinder after taking-up, multiple tracks insulation screen and various insulation molding part put into drying room 90 ℃ of insulations;

Step 4, inspection and maintenance transformer coil internal side diameter, the fault point of repairing transformer coil internal side diameter;

Profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part in step 5, taking-up drying room, insulate screen and various insulation molding part of multiple tracks recovered to be installed in transformer coil by sign and inside and outside order successively, then profiled insulation cylinder is arranged to transformer coil internal side diameter upper end, adopt 3 tons of deadweights, diameter to be greater than the coil press mounting plane bottom plate of profiled insulation cylinder, be placed on profiled insulation cylinder, the deadweight of dependence chassis, slowly profiled insulation cylinder be pressed in transformer coil and put in place, completing the maintenance of transformer coil internal side diameter.

This repair method has guaranteed the intact taking-up of all insulated products of transformer coil upkeep operation coil internal side diameter, and can in the transformer coil after maintenance completes, continue to use, avoided the insulated product occurring in traditional overhaul process to scrap caused cost increase, ensured carrying out smoothly of transformer coil maintenance, thereby for regular maintenance or the trouble hunting of transformer coil internal side diameter provides effective means, overhaul efficiency and repair quality have been improved.

Claims (1)

1. the harmless repair method of high-power transformer internal coil diameter side, is characterized in that this method comprises the steps:

Step 1, the whole phase transformer coil of band oil is placed in to the dry drying room of coal oil vapor-phase, and to carry out de-oiling dry, and de-oiling drying time is 48 hours, and temperature is 105 ℃;

Step 2, maintenance transformer coil temperature are not less than 80 ℃, and the dried coil of de-oiling is carried out successively to sign by coil gear in profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part;

Step 3, use profiled insulation cylinder hoisting tool special are extracted profiled insulation cylinder in coil, and multiple tracks insulation screen and various insulation molding part in coil are all taken out successively, the profiled insulation cylinder after taking-up, multiple tracks insulation screen and various insulation molding part put into drying room 90 ℃ of insulations;

Step 4, inspection and maintenance transformer coil internal side diameter, the fault point of repairing transformer coil internal side diameter;

Profiled insulation cylinder, multiple tracks insulation screen and various insulation molding part in step 5, taking-up drying room, insulate screen and various insulation molding part of multiple tracks recovered to be installed in transformer coil by sign and inside and outside order successively, then profiled insulation cylinder is arranged to transformer coil internal side diameter upper end, adopt 3 tons of deadweights, diameter to be greater than the coil press mounting plane bottom plate of profiled insulation cylinder, be placed on profiled insulation cylinder, the deadweight of dependence chassis, slowly profiled insulation cylinder be pressed in transformer coil and put in place, completing the maintenance of transformer coil internal side diameter.