* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download rt41LURES IN THREE-PHASE STATOR WINDINGS
Mercury-arc valve wikipedia , lookup
Electrical ballast wikipedia , lookup
Current source wikipedia , lookup
Thermal runaway wikipedia , lookup
Electrification wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Commutator (electric) wikipedia , lookup
Electric power system wikipedia , lookup
Ground (electricity) wikipedia , lookup
Power inverter wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Brushless DC electric motor wikipedia , lookup
Power MOSFET wikipedia , lookup
Electric motor wikipedia , lookup
Electrical substation wikipedia , lookup
Power engineering wikipedia , lookup
Voltage regulator wikipedia , lookup
History of electric power transmission wikipedia , lookup
Brushed DC electric motor wikipedia , lookup
Buck converter wikipedia , lookup
Opto-isolator wikipedia , lookup
Distribution management system wikipedia , lookup
Power electronics wikipedia , lookup
Transformer wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Transformer types wikipedia , lookup
Rectiverter wikipedia , lookup
Electric machine wikipedia , lookup
Stray voltage wikipedia , lookup
Voltage optimisation wikipedia , lookup
Alternating current wikipedia , lookup
Coil winding technology wikipedia , lookup
Surge protector wikipedia , lookup
Mains electricity wikipedia , lookup
Induction motor wikipedia , lookup
rt41LURES IN THREE-PHASE STATOR WINDINGS MAGNETO ELECTRIC SINCE 1946 1150 EGLINTON AVE. EAST MISSISSAUGA, ONTARIO L4W2M6 TELEPHONE (905) 625-9450 FAX (905) 625-4540 WEBSITE www.magnetoele.com E MAIL [email protected] UJrll-Ol·UJnl paJJ04S 6U!PU!M (pa~uuo~ -v) pa5B4d- a16U!S 6U!PU!M aset~d-Ol-asB4d paJJ04S 6U!PU!M (paJ:>aUUO~ - A) pa5B4d-ai6U!S 6U!PU!M rJlVJS 1SVHJ·11HH1 Nl S1H01/V:I WINDINGS Winding with Shorted Coil Winding Grounded in the Slot Winding Grounded at Edge of Slot Shorted Connection Phase Damage Due to Unbalanced Voltage Winding Damaged Due to Overload Damage Caused by Locked Rotor Winding Damaged by Voltage Surge I he life of a three-phase stator winding can be shortened dramatically when the motor is exposed to unfavorable operating conditions- electrical , mechanical or environmental. The winding failures illustrated in this brochure are typical of what can happen in such circumstances. They are shown here to help in identifying the causes of failure , so that, where possible, preventive measures may be taken . new stator winding is pictured above for purposes of comparison with the winding failures shown in Photos 1 - 12. Descriptions of the causes of failure are provided on the back cover. TYPICAL CAUSES OF WINDING FAILURES IN THREE-PHASE STATORS Photo Number 1&2 A single-phased winding unbalanced loads on the power source, a poor connection at the motor terminal, or a high resistance contact (weak spring) . NOTE: A one-percent voltage unbalance may result in a sixto ten-percent current unbalance. failure is the result of an open in one phase of the power supply to the motor. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. 3,4,5, These photos illustrate 6,7 insulation failures that typically &8 are caused by contaminants, 10 Thermal deterioration of the insulation in all phases of the stator winding typically is caused by load demands exceeding the rating of the motor. NOTE: Under-voltage and over-voltage (exceeding NEMA standards) will result in the same type of insulation deterioration. abrasion , vibration or voltage surge. 9 Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases. Unequal voltages usually are caused by ) 11 Severe thermal deterioration of the insulation in all phases of the motor normally is caused by very high currents in the stator winding due to a locked rotor condition. It may also occur as a result of excessive starts or reversals. 12 Insulation failures like this usually are caused by voltage surges. Voltage surges are often the result of switching power circuits, lightning strikes, capacitor discharges and solid-state power devices. : Prepared by: Engineering Committee Electrical Apparatus Service Association, Inc. 1331 Baur Boulevard St. Louis, Missouri 63132 (314} 993-2220 Copyright 1985 600JK50M·600