CN1980011A

CN1980011A - High-voltage motor stator winding winding breakdown repairing method

Info

Publication number: CN1980011A
Application number: CN 200510129375
Authority: CN
Inventors: 吴刚
Original assignee: JIANGSU XI'ANDA EXPLOSIVE-PROOF STOCK Co Ltd
Current assignee: JIANGSU XI'ANDA EXPLOSIVE-PROOF STOCK Co Ltd
Priority date: 2005-12-09
Filing date: 2005-12-09
Publication date: 2007-06-13

Abstract

Purposes of the disclosed method are to solve issues of long repair time, high cost and difficult repair when breakdown between turns or breakdown over the ground occurs in stator winding of high voltage motor in operation. Breakdown between turns or breakdown over the ground are divided to two types generally: breakdown at upper layer border, or underlayer border. Scheme for repairing winding at upper layer border is: shearing off straight edge of winding at damaged point; using half turn of winding to carry out butt weld; passing through insulation process. Scheme for repairing winding at underlayer border: shearing off straight edge of winding in same slot above the winding at damaged point; then, shearing off straight edge of winding lower the winding at damaged point; using half turn of winding to carry out butt weld; passing through insulation process. Then, the method repairs winding at upper layer border according to repairing scheme.

Description

High-voltage motor stator winding winding breakdown repairing method

(1) technical field

The present invention relates to the repair method of motor stator winding, be specially high-voltage three-phase asynchronous motor moulding stator winding winding breakdown repairing method.

(2) background technology

Its structure of motor stator winding coil is seen Fig. 1, and it comprises end 1, straight line position 2.It forms by the circle coiling by electromagnetic wire 3, electromagnetic wire 3 total n circles among Fig. 2, and 4 is that turn-to-turn insulation, 5 is insulation against ground.The structural relation of itself and motor stator is seen Fig. 3, upper and lower two positions at coil straight line position 2 are installed in the different slots of stator core 7 respectively and are distributed in the top and the bottom of groove respectively, be limit, upper strata 8, lower floor limit 6, straight line position 2 is set in the groove, and end 1 is distributed in the outside at groove two ends, has only expressed an end of 1 coil in the stator among the figure.In the quality accident of motor, about 1st/3rd, the broken pressure of winding insulation punctures, and winding is embedded in the stator, and its repairing difficulty is bigger, especially VPI formula insulation system, coil is with unshakable in one's determination bonding firm, the repairing difficulty of winding is bigger, and maintenance producer is whole overhaul way that motor coil is scrapped of general employing when the broken pressure of motor, is about to all coils and destroys, again make coil then, dipping lacquer is finished through rolling off the production line.The method repair cycle of this overhaul is long, the cost height, and difficulty is big.

(3) summary of the invention

At the problems referred to above, the invention provides broken pressure of a kind of Stator Winding of High Voltage Motor and puncture repair method, adopt this method easy to maintenance, both used manpower and material resources sparingly, and waste is also few.

Its technical scheme is such: it is characterized in that: it may further comprise the steps,

A, determine the broken position of pressing, understanding breakdown point is in straight line or end, is breakdown between adjacent turns or punctures over the ground, is that circle broken pressure the in sideline, upper strata punctures or lower floor's broken pressure of sideline circle punctures;

B is if circle broken pressure the in sideline, upper strata punctures, then directly remove brokenly place, line ball circle end and tie up rope, the overhang insulation that removes brokenly line ball circle straight line and be connected with straight line, guarantee to puncture the position and be positioned at described insulation, remove described insulation to leaking copper with chisel, the insulation of both sides and bottom can be temporarily motionless;

C, the copper cash at two ends cutter is disconnected with chisel, and will contain the disconnected bar that punctures the position and start and pull out, according to said method all slivers that this sideline, upper strata is enclosed are all pulled out;

D, cleaning are drawn out the unnecessary insulation of the reserve part end of interior remaining insulation of stator slot of disconnected bar and the motor coil that quilt is repaired;

The termination insulation is cut off and removed to the lead at the reserve part both ends of the motor coil that e, arrangement are repaired, and guarantees when cutting off that the electromagnetism wire turn increases by circle length from top to bottom;

F, around a coil identical with this motor model, the expansion shaping, cut corresponding part according to the motor coil of being repaired by sheared-off part then, with of the both ends one by one corresponding welding of this part with the reserve part of the motor coil of being repaired, solder joint is with the file equating and wrap turn-to-turn insulation, the handbag insulation against ground, the wrapping number of plies and thickness are determined according to the data of primary coil;

G, will wrap under the coil upper strata of insulation in groove, seal groove with slot wedge;

H, do withstand voltage over the ground and the turn-to-turn shock test, use the VPI paint-dipping drying at last.

It is further characterized in that: if lower floor's broken pressure of sideline circle punctures, sideline, the upper strata circle that then will break circle place, the lower floor sideline groove of pressure trips out according to the method described above, and then with the taking-up according to the method described above of lower floor's sideline circle, respectively around two coils identical, cut off cutting, corresponding welding, bag insulation and following groove, paint-dipping drying according to corresponding site respectively equally according to the method described above with this motor model.

Adopt said method, easy to maintenance, saved manpower and materials, thereby the overhaul way of having avoided existing employing complete machine coil to scrap destroys all coils with chisel, reinstalls coil then, both lost time like this, wasted the bigger shortcoming of dismounting difficulty of coil and whole coil again.

(4) description of drawings

Fig. 1 is the stator coil schematic diagram;

Fig. 2 is stator coil straight line (end) cutaway view;

Fig. 3 is installed on schematic diagram in the stator core for stator coil.

Fig. 4 rejects the broken place of pressing at the straight line schematic diagram for stator coil

(5) embodiment

The maintenance process of the inventive method is described: at the repairing of sideline, upper strata circle below in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4:

A, definite broken position of pressing check that breakdown point is at straight line position 2 or end 1, are that turn-to-turn insulation 4 punctures or insulation against ground 5 punctures;

B, remove brokenly 1 place, line ball circle end and tie up rope, the overhang insulation that removes brokenly line ball circle straight line and be connected with straight line is guaranteed to puncture the position and is positioned at described insulation, removes described insulation to leaking copper with chisel, and the insulation of both sides and bottom can be temporarily motionless;

C, the copper cash at two ends cutter is disconnected with chisel, and will contain the disconnected bar that punctures the position and start pulls out with crane or other instrument bar that will break, and according to said method all slivers that this sideline, upper strata is enclosed are all pulled out; As Fig. 4

D, cleaning are drawn out interior remaining insulation of stator slot of disconnected bar and the unnecessary insulation in reserve part end of the motor coil that quilt is repaired;

The termination insulation is cut off and removed to the lead at the reserve part both ends of e, the motor coil repaired of arrangement, guarantees when cutting off that the electromagnetism wire turn increases by circle length from top to bottom, and during follow-up like this welding, solder joint is dispersion, is convenient to follow-up insulation processing;

F, around a coil identical with this motor model, the expansion shaping, cut corresponding part according to the motor coil of being repaired by sheared-off part then, with of the both ends lead one by one corresponding welding of this part with the reserve part of the motor coil of being repaired, adopt the silver-colored phosphorus hard solder of overlap joint, solder joint is with the file equating and wrap turn-to-turn insulation, the handbag insulation against ground, and the wrapping number of plies and thickness are determined according to the data of primary coil;

Groove is sealed with slot wedge in g, the following upper strata in the groove of coil that will wrap insulation;

H, do withstand voltage over the ground and the turn-to-turn shock test, use the VPI paint-dipping drying at last, withstand voltage and turn-to-turn shock test voltage apparatus, VPI paint-dipping drying equipment all belong to existing equipment.

So winding is repaired, above-mentionedly relate to the stator repairing of sideline circle 8 at the middle and upper levels, when lower floor's sideline circle 6 broken pressures puncture, sideline, the upper strata circle that broken lower floor sideline of pressing is enclosed 6 place grooves takes out according to the method described above, and then with the taking-up according to the method described above of lower floor's sideline circle, respectively around two coils identical, cut off cutting, corresponding welding, bag insulation and following groove, paint-dipping drying according to corresponding site respectively according to the method described above with this motor model.

Claims

A kind of high-voltage motor stator winding winding breakdown repairing method, its technical characterictic is: adopt the local repair scheme, wipe out brokenly the straight line of pressure point place coil, adopt half new coil of silver-colored phosphorus weldering butt joint, handle through insulation, reach the purpose of repairing.