Amp Motor
Todays deals on Amp Motor?
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700 HP GE Custom 8000 Induction Motor 440 Volts, 804 Amps. 3570 RPM Item #8406 $16,000.00 |
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Siemens Tiastar Motor Control Center 3 Phase 50/60 HZ 800 Amp, 480 Volt $5,000.00 |
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Cutler Hammer HMCP12Y8W series C motor circuit protector 1200amp 3pole 600VAC $4,000.00 |
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WH 200HP MOTOR, 460V, FR-447TZ, ENCL-TEFC, 221AMPS, CAT#20004 TE, WARRANTY $2,799.00 |
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New 350 HP 460 150 HP 230 SSW07 Reduced Voltage Electric Motor Starter 412 Amp $2,299.00 |
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Motor control cabinet 200 amp SQ D Hoffman AB $1,750.00 |
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TECO, 200HP MOTOR, 460V, 214AMPS, 1775RPM, ENCL-TEFC, FR-447TZ, MOD#AEHE $1,999.00 |
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New 300 HP 460 150 HP 230 SSW07 Reduced Voltage Electric Motor Starter 365 Amp $1,950.00 |
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Okuma BL-D30A Drive XA Axis _ 25 Amp Servo BLD30A for Motor BL-50E-20 $1,850.00 |
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New 250 HP 460 125 HP 230 SSW07 Reduced Voltage Electric Motor Starter 312 Amp $1,830.00 |
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Siemens Permanent Mag Motor 1 FT5102-0AC71-1-Z_1FT51020AC711Z_Amp 16.5/20.5 $1,800.00 |
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Siemens Perm Magnet Motor 1 FT5102-0AC71-1-Z_1FT51020AC711Z_ 15.5 / 19.5 AMP $1,800.00 |
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AC ELECTRIC MOTOR, 40 HP, 100/50 Amps, 230/460 VAC $1,800.00 |
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Okuma BL-D50A Drive XA Axis _ 33 Amp Servo BLD50A for Motor BL-80E-20 $1,700.00 |
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New 200 HP 460 100 HP 230 SSW07 Reduced Voltage Electric Motor Starter 255 Amp $1,699.00 |
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HURLETRON 75HP DC MOTOR, 1150/2000RPM, 350V, 110AMP, WINDING STAB-SHUNT, $1,699.00 |
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Cutler Hammer ECN2431CAG-A29 size 3 combination motor controller w 100amp HMCP $1,500.00 |
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Westinghouse Size 5 motor starter,300amp contactors $1,500.00 |
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Cutler Hammer Motor Control Bucket Size 4 With JD3250 250 Amp Breaker 30″ W/Door $1,375.00 |
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ALLEN-BRADLEY 1326AB-A3E-11 1.2KW 3000 RPM 7.8 AMP SERVO MOTOR $1,394.75 |
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New 150 HP 460 75 HP 230 SSW07 Reduced Voltage Electric Motor Starter 200 Amp $1,399.00 |
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Westinghouse 36″ Motor Control Bucket Size 5 With MCP 400 Amp Breaker Reset $1,329.05 |
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Westinghouse 36″ Motor Control Bucket Size 5 With MCP 250 Amp Breaker Reset $1,258.75 |
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Okuma BL-MH101E-20SB_ BL Motor _ER-FC-2048D_ 8.4 Amp (2) 9.24 Amp (1) $1,200.00 |
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#POWERTEC BRUSHLESS D.C. MOTOR.HP 1. INPUT V.115. AMP 11.2.MODEL # C001.3R1CH00N $1,199.99 |
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New 125 HP 460 60 HP 230 SSW07 Reduced Voltage Electric Motor Starter 171 Amp $1,199.00 |
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KTA3-100 63-90 Amp Motor Circuit Controller FREE SHIPPING $1,195.00 |
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KTA3-100 63-90 Amp Motor Circuit Controller FREE SHIPPING $1,195.00 |
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FANUC AC Servo Motor A06B-0501-B206#7073 11Amp 2000rpm *Tested* $1,100.00 |
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Marathon, 200HP AC Motor, 460V, 231Amps, 1780RPM, FR-445TS $1,175.00 |
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Cutler-Hammer ENC1611AAC 30 Amp Combo Motor Starter Series A1 Style 84-28748-5 $1,044.99 |
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Allen Bradley 2100 Series Motor Control Size 4 32″ with JDB 175 Amp Breaker $973.75 |
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NIB Curtis AC Motor Controller Electric Car EV 1238-6501 108v 550amp Programable $999.95 |
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Okuma BL-MC75E-20TB _ BL Motor _ BLMC75E20TB _ 7.35A Amp, 3 Phase, 133 HZ, 133V $1,000.00 |
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Okuma BL-MC75E-20TB _ BL Motor _ BLMC75E20TB _ 6.68A Amp, 3 Phase, 133 HZ, 133V $1,000.00 |
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New 100 HP 460 50 HP 230 SSW07 Reduced Voltage Electric Motor Starter 130 Amp $999.00 |
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Baldor Motor 30 HP, 220/440 V, 79/39.5 amp, 1760 rpm $975.00 |
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WESTINGHOUSE 100 HP ELECTRIC MOTOR 3-Phase 1775RPM 115AMP $950.00 |
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KTA3-100 16-25 Amp Motor Circuit Controller FREE SHIPPING $925.00 |
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KTA3-100 16-25 Amp Motor Circuit Controller FREE SHIPPING $925.00 |
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KOLLMORGEN BDS4A-203J-0001-202A2 SERVO MOTOR AMPLIFIER AMP CONTROL $895.00 |
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KOLLMORGEN BDS4A-203J-0001-202A2 SERVO MOTOR AMPLIFIER AMP CONTROL $885.00 |
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ECL03B1HBA Cutler Hammer Motor Starter 20 Amp NEMA 1 Lighting Contactor Switch $848.88 |
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CH Cutler Hammer Size 1 Combo Motor Starter 30 Amp $800.00 |
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ALLEN BRADLEY POWERFLEX 40 22B-D017N104 MOTOR DRIVE 18.4AMP 342-528VAC 48-63HZ $843.00 |
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ZEBOTRONICS SE.800.06.85 V13 STEPPING MOTOR AMP BOARD ***NNB*** $799.00 |
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GE 400 Amp Mag-Break Motor Circuit Protector TJC36400B NEW!!!! $800.00 |
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Cutler Hammer size 5 motor circuit protector 250amp MCP532500 $800.00 |
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SHUNT WOUND DC MOTOR, 7.5 HP, 12.7 Amps, 500VDC $800.00 |
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ZEBOTRONICS SE.800.06.85 STEPPING MOTOR AMP BOARD ***NNB*** $779.00 |
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Cutler Hammer HMCP150T4C Ser C Motor Circuit Protector 150 AMP 600 VAC *NEW* $745.00 |
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Square D 8536 combo motor starter, size 3, outdoor enclosure, 110v coil, 100amp $630.00 |
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YASKAWA SGDV-R90FE1A000000300 SERVOPACK SIGMA SERIES SERVO MOTOR AMPLIFIER AMP C $747.50 |
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Westinghouse HM2P400X5W motor circuit protector 400amp 2pole 600VAC 250VDC $700.00 |
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Cutler Hammer HM2P400X5WM01S10Y07 series C motor circuit protector 400amp 2 pole $700.00 |
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Westinghouse HM2P4XWS10 motor circuit protector 400amp 2pole $700.00 |
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Square D 8538SCG11V02S NEW Motor Starter Type 1 30 Amp $650.00 |
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NEW IN BOX, ITE EF3A100 MOTOR CIRCUIT INTERRUPTER CIRCUIT BREAKER 100 AMP 480V $700.00 |
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30 HP Eniclosed Motor U.S. Electrical Motors 230/460 AMP AC RPM 1175 $699.99 |
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KLOCK-MOELLER MOTOR DISCONNECT SWITCH CAT#N12-630-CNA 600 AMP 600 VOLT $699.99 |
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New 50 HP 460V 20 HP 230V SSW07 Reduced Voltage Electric Motor Starter 61 Amp $699.00 |
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NEW 25amp OPEN 15HP motor protection output filter $695.00 |
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60 HP 460 v Volts WEG Soft Start SSW05 85 Amp 3 Phase Electric Motor Starter $694.00 |
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30 HP 230 v Volts WEG Soft Start SSW05 85 Amp 3 Phase Electric Motor Starter $694.00 |
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CURTIS MOTOR CONTROLLER 1266-5201 48V 300 amp golf cart $675.00 |
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40 HP 460 v Volts WEG Soft Start SSW05 60 Amp 3 Phase Electric Motor Starter $654.00 |
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20 HP 230 v Volts WEG Soft Start SSW05 60 Amp 3 Phase Electric Motor Starter $654.00 |
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CUSTOM MOTORS SERVO AMPLIFIER AMP CA8.2-14-E 2KVA 8.8A 12148 $649.99 |
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Fanuc AC Servo Motor 0S OS_A06B-0313-B172#7000_A860-0346-T101_4.2 AMPS_Class F $625.00 |
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ACRISON ACR300A 2-5HP 230V 26AMP MOTOR CONTROLLER ***NNB*** $599.00 |
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NEMA SIZE 4 MOTOR STARTER 200 AMP CONTACTOR AND 400 DISCONNECT 600 V MAX $499.00 |
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New 60 HP 460 30 HP 230 SSW05 Reduced Voltage Electric Motor Starter 85 AMPS $615.00 |
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Eaton HMCP150T4 series C motor circuit protector 150amp 600VAC 3 pole 250VDC $600.00 |
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Westinghouse HM2P250L5W motor circuit protector 250amp 2pole 600VAC 250VDC $600.00 |
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Cutler Hammer HMCP150T4C series C motor circuit protector 150amp 3pole 250VDC $600.00 |
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ELECTRIC MOTOR 208V 3 PHASE 3.0 AMP FRAME 45Y 16.6 6.5 $500.00 |
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GE 25HP MOTOR, 230/460V, 3520RPM, FR-256T, ENCL-DP, 58/29AMPS, MOD#5K256ACI05 $599.00 |
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NEW BALDOR 7 1/2HP MOTOR, 230/460V, 1760V, FR-213T, CAT#M3710T, 20.4/10.2AMPS $599.00 |
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Allen Bradley 6″ Motor Control Center Bucket , 90 Amp $550.00 |
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30 HP 460 v Volts WEG Soft Start SSW05 45 Amp 3 Phase Electric Motor Starter $594.83 |
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15 HP 230 v Volts WEG Soft Start SSW05 45 Amp 3 Phase Electric Motor Starter $594.83 |
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PARKER HANN CORP AR-13SE SERVO MOTOR AMP,DRIVE $589.99 |
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Siemens Motor Control Starter 30 Amp 5 Pole NEMA 1 Magnetically Latched 277VAC $555.99 |
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BALDOR L5009A AC MOTOR 1 HP 115-230 VOLT 3450 RPM 3 PH 12/6 AMP $529.99 |
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100 AMP Motor Circuit Breaker Interrupter FREE SHIPPING $577.00 |
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Allen Bradley 2100 Size 3 120 V Motor Control Bucket 24″ With HMCP 100 Amp $498.75 |
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SQUARE D 100AMP 8539SEG42 NEMA SIZE 3 MOTOR CONTROLLER $400 $400.00 |
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SQUARE D MOTOR STARTER; CLASS 8536, NEMA SIZE 3 WITH 100 AMP, 3 POLE BREAKER $500.00 |
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Allen Bradley 2100 Motor Control Bucket 30″ Size 3 509 120V With FDB 100Amp 600V $470.25 |
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ALLEN BRADLEY 150-A16NA MOTOR CONTROLLER 16AMP 150A16NA $525.00 |
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Allen Bradley 2100 Series Dual Motor Control Size 1 With HMCP 30 Amps With Door $451.25 |
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Cutler-Hammer 50 Amp Motor Circuit Protector HMCP050K2CA01 with AUX Switch -New! $500.00 |
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New 40 HP 460 20HP 230 WEG SSW05 Reduced Voltage Electric Motor Starter 60 Amp $505.00 |
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Superior SLO-SYN 3180-PT Translator Motor Drive 115 VAC 5 Amp 50/60 Hz $450.00 |
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Fuji EFL-7.5G11-4 3phase RFI filter 380-480 V 50-60Hz 35 amps $345.24 |
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Fuji EFL-7.5G9-4 3 phase RFI filter 380-480 V 50-60Hz 35 amps $345.24 |
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Eaton Cutler Hammer ECN2428CKR 50 Amp Size 2 Combination Motor Controller $500.00 |
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Kollmorgen DC Motor TTE-29370-3007-AD-13 90vdc 1400rpm 15.4 amp $500.00 |
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YAMAHA G19 48V 48 volt 350 AMP SPEED MOTOR CONTROLLER $480.00 |
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PARKER HANN CORP AR-08SE SERVO MOTOR AMP,DRIVE $489.99 |
Amp Motor Questions
Captive Power Plant and Motor Problems
Captive Power Plant and Motor Problems
Squirrel cage induction motors in general are sturdy and robust in construction and are supposed to have sufficient overload capacity. But even then failure experiences due to winding burn-out is not uncommon. Such results from impropriety of application, deviations in supply system, incapacity of motor accessories, inadequacy of protective devices, aggressive environmental factors, pollutions etc. Here below are considered few of these in relation to few peculiar abnormalities experienced in an industry having captive power station.
General Captive Power House Consideration
A general power house practice is to maintain generated voltage with plus tolerance limits so that at consumer end it is at the right level. The consumer also takes precautions wherever necessary using tap changing transformers so that available voltage at the equipment terminal does not cause starvation. Relevant Indian Standard Specification [ISS] specifies +/- 10% tolerance on 11 kV H.V. and +/- 5% tolerance on 415 V L.V. systems. Thus there is the criticality of ensuring right voltage levels [tolerance being of a wider band for H.V. system] at utility points. In study of a certain case it was seen that relevant Plant design Specification [PDS] specifies generation voltage as 11500 V +/- 10% volts.
Over Voltage Condition in System
A system designed with these paramount consideration with interposing transformer ratio as 11000/433 volts the receiving end voltage at utility points on L.V. system becomes 440 V disregarding transformers regulations while generator are operated at 11.2KV. Such is a marked deviation from the ascribed 415V of the L.V. system as +5% gives a maximum of 435.75V as the permissible limit.
Low System Voltage and Motor Starting
Again if a motor designed at 415V is required to maintain developed torque at a higher value throughout the acceleration period than the resistive torque even when the terminal voltage is 340V as is envisaged in relevant PDS [the motor is to give required torque for acceleration even when the system voltage is 80% of the rated] such voltage may become injurious. At 80% terminal voltage during starting a cage induction motor develops 64% of the rated torque. In case the torque is to be maintained higher than this level special winding and slot configurations will be necessary like multiple cages, stepped slots, formation of end turns otherwise the motor will be overloaded.
Incapability of Conventional Bi – Metallic Thermal Over Load Relay
Under above conditions a bi-metallic thermal overload relay, which replicates the winding temperature rise, caused by the current flow remains overset to protect the system from overloads. A conventional thermal O/L relay with rated current set as Relay current [Ir] will have its trip operated only after the motor current rises above 135% of the load current.
Effect of System Unbalance
Under considerations of system-unbalance-abnormalities in the rotating system excepting only the winding heating due only to current flow remains unaccounted till a breakdown occurs. Such leaves the motor unprotected also against voltage unbalances creeping into the system due to resistive contacts/joints in the current path since 3.5% unbalance will cause about 25% increase in the winding temperature rise. In cooling tower installations such effect is very much pronounced in cooling tower fans since cooling tower is a wooden structure and have problem of high vibration due to which the cable terminal contacts to the motor winding gets loosened.
Such situation becomes unavoidably grave when motor absorbed power remains in much lower range. To exemplify we can consider an 11 KW 415 Volts 3 phase squirrel cage induction motor rated at 21 Amps, over load thermal trip set at 100% and drawing a load current of 11-to-13 Amps during normal loaded run. This motor will evidently be not overloaded even when the rotating system abnormalities demand an additional 4 KW due to bearing failure, cooling air fan failure, friction between stator and rotor due to loosening of slot insulation etc. And this is a huge amount of energy capable of causing physical damages even to the motor body by breaking it into pieces. Again under severest condition of unbalance when one phase-supply to the motor totally fails the motor current will reach a maximum of 23 Amps. A thermal overload relay set at 21 Amps having threshold operating current at 23.1 Amps remains inadequate to protect the motor. Such an overload protection will be found incompatible if further conditions of motor de-ratings due to environmental and pollution conditions are included.
An Approach for better protection.
With the development of technology and microelectronics establishing inroads into electrical protections more comprehensive protection systems are made possible. International Electro technical Commission had brought about major changes on standards covering low voltage switchgears and control gears in 1988. Indian standard institution with a view to adopt these changes introduced a new standard in 1993 having a dual number IS 13947/IEC 947. Further introduction of Intelligent Electronic Devices (IED) have made possible evaluating starting, operating, stalling conditions separately, measuring residual heat in the motor winding/laminations/cores; qualifying supply source etc. — the current related phenomenon of which in earlier times were necessarily to be co-ordinate in a single characteristics of thermal overload relay. These facilities afforded, an IED become lucrative but its cost is also high. One such type is the Motor Vision Relay of M/s L&T. As a cost effective measure different manufacturers have developed protective gears, which can be coordinated with current limiting MCCB / Contactor after thorough consideration and analytical study of the drive and the driven machine.
Various designs of motors and their protection gears are being developed to suit specific applications. All these changes are not globally done and manufacturers are competing hard for economic solution for the already installed and operating industries. Indigenous manufacturers like L&T, Siemens, Minilec are making available in the market low watt loss, high voltage fuses, faster and slower overload relays incorporating current sensing on single phasing, current limiting MCCB and Contactors, PTC Thermistor protections etc. These properly selected and coordinated are certain to afford better motor safety.
About the Author
P. Malakar, author of this article practiced electrical engineering for 30years after graduation and he, during his service period, headed electrical department and captive power plat in a fertilizer industry. He was, hence, required to consider the requirements of both plants and generators. The article is based on his experience.
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