Subject to the rules for classification and construction of gl electrical machinery is not required to be type tested. Pdma corporation has developed these portable motor testers. These contacts are used to break open the closing circuit when the external close signal is removed. That is, with the same test connections and with the same test voltage applied for the same length of time.
Testing 100% routine test quality is emphasised at each step as a motor proceeds through each stage of design, assembly and testing. Electrolytic capacitors fail due to leakage or vaporization of the electrolyte inside. Ieee std 1122004, ieee standard test procedure for. Pdma corporation is the leader in the field of predictive maintenance, condition monitoring applications, and the development of electric motor test equipment for motor circuit analysis. The majority of insulation testing centers around the ac power factor method. Complex, powerful tools, electric motors are critical components in a wide range of equipment and. Dec 30, 2018 testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off. Rules for classification and construction vi additional. Determine the motor parameters and the total core, friction and windage losses. Motor power switching is done automatically by the system.
The comparative environmental impacts of motor rewinding vs. Lowcost portable unit, with all the major motor performance tests of the motorlab system. Ignition coil structure the design of a conventional ignition coil is basically similar to that of a transformer. Inspection, testing and commissioning of electrical. Testing of increased safety ht induction motor for. When faced with testing a medium to high voltage motor utilize the secondary circuit to access the current and voltage information. The squirrel cage rotor of the induction motor set in the rotating field of the stator should accelerate until it is running steadily at a speed which is slightly less than the synchronous speed at which the magnetic field rotates. Positioning since steppers move in precise repeatable steps, they excel in applications requiring precise. Knowledge of the basics together with powerful new test. Testing of ht motors mechanical engineering electrical engineering. Ignition coils in motor vehicles function, diagnosis. Testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off. Induction motor, no load test, blocked rotor test, vibration test, temperature test, phase sequence test, insulation resistance test.
Motor guide february 2014 low voltage motors motor guide. The ignition coils task is to induce a high voltage from a low voltage. Most insulation systems may be modeled as a capacitor in parallel with a resistor. Routine testing this inspection is carried out on every motor. For performing this test we use time interval meter scot m3k, the following show the connection drawing of testing equipment wit h. Electric motor testing explained the electricity forum. The test generally applies between 100 and 5,000 v or more. Testing of ht motors free download as powerpoint presentation. What really matters is the trend in readings over a time period, showing lessening resistance and warning of coming problems. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. Testing manual for electrical equipment nahed alhajeri 1and anantha madhavan 2 abstract quality assurance qa refers to a program for the systematic monitoring and evaluation of the various aspects of a project, service, or facility to ensure that standards of quality are being met. This a a type of test in which if the moisture is found in the motor then. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36.
Companies across the globe trust our reliability solutions, products, and services. Centre may introduce motor vehicle bill today india news. Ht motors mainly scim, limited form can be applied to slip ring motors machine requirements. To understand this we need to know the cost associated with the failure of motor, i. It should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. Recommended interpretation of iec 6003421 external contact seals at the drive shaft extension ends shall be removed prior to testing. Each motor is given a routine test as required by bs4999, as59 or nema mg 1 to determine that it is free from electrical or mechanical defects. Centre may introduce motor vehicle bill today the bill proposes changes to only three sections from an earlier amendment bill, which had lapsed with the dissolution of the 16th lok sabha. Figure 4typical record of insulation resistance of a mill motor. Testing and commissioning procedure for electric motors eep.
Additional special tests beyond the routine test are. Ieee std 1122004, ieee standard test procedure for polyphase. Sealing elements that can only be removed by dismantling the motor shall be left in place. The repairer will keep a copy of the motor repair form and the repairers tracking form in the file for the particular job. Motor protection relay for high voltage induction motor. Motor vibration shall be measured in a triaxial direction, i. Feb 23, 2018 the induction motor, rotor is not connected to an external source of voltage. Let us assume that the threephase supply given to the motor has a phase sequence of ryb, then the motor. Dropforged eyebolts per american society of testing materials a489 or equivalent must be used. Testing of increased safety ht induction motor for hazardous area. Testing and assessment of ex e motor the designed ex e ht squirrel cage induction motor are tested and assessed for performance of motor to ensure that these designed motor will not be unsafe in hazardous area.
Mediumhigh voltage motor testing note 0303 application note description emax test equipment has a limit of 600 volts, but much of the testing performed is on motors that are operating on 2300 volts or greater. For higher hp 250hp motors we prefer high voltage, because it will reduce operating current and the size of the motor. The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. The tests and assessment for the ex e motors are as. Well learn how to identify windings, check windings resistance and insulation resistance.
Testing of ht motors mechanical engineering electrical. Test to obtain more reliable values ranges of both wattmeter should be 10a, 250v for blocked rotor test. Above 90% of motors used in an industry are induction motors, because they are cheap, robust and easy to maintain. Megger guide to electrical insulation testing pdf instrumart. Indias largest generator set manufacturer over 10,000 mw installation base 3. The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. Animation from wikimedia commons what are stepper motors good for. Do not lift both the motor and driven equipment with the motor lifting means. A protocol involving voltage level, time duration, intervals between tests and connection methods must be composed, taking into account the type and size of the equipment, its value and role in the production process and other factors. Isbn 07389785 ss95211 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Motor testing methods based on iec 6003421 p ll determined from residual loss 8.
Model repair specifications for low voltage induction motors. Positioning since steppers move in precise repeatable steps, they. The induction motor, rotor is not connected to an external source of voltage. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Let us look at some of the reasons for failure of capacitors. Mar 28, 2018 in this video you will find out how to test 3phase induction motor. To obtain short circuit current and its power factor angle, block rotor test is performed on the motor. However, on application electrical machinery may be type tested. Ht commissioning 6 test provides information that can be used to detect problems such as weak accelerating springs, defective shock absorbers, dashpots, buffers, and closing mechanisms. Since the ac tivity of 5 ht neurons is also suppressed during rem sleep, it was speculated that there might be. Ht motor testing manual readdownload this service manual has been prepared by parker hannifin corporation for or testing reveals evidence of abnormal wear or damage to the tgk motor or if you. What is the difference between ht and lt motor dear friend for the same power rating the size of lt motor is much bigger than ht motor.
For this motors, we require three phase power supply, whereas thus three phase power must be supplied in a sequence. In this video you will find out how to test 3phase induction motor. As energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Ieee standard test procedure for polyphase induction motors and generators 3 park avenue, new york, ny 100165997, usa ieee power engineering society sponsored by the electric machinery committee 4 november 2004 print. Ht motor will rotate at a low speed if 415 v power supply is given to the terminals of an ht motor. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. The complete guide to electrical insulation testing.
The failure of capacitors can lead to shortcircuit, damage to the circuit and sometimes even explosion. It involves checking that the motor possesses the necessary electrical strength and that its electrical and mechanical performance is satisfactory. Consider the working of a motor for a better understanding of these indicators. Rewinding of motors pdf the information in this report and the good practice guide to maintain motor efficiency part 2 was. But smart companies understands is that what this means for maintenance programs is billions of dollars of lost revenue through increased motor repair costs, downtime, and waste in industrial and commercial companies. Jul 06, 2016 a dmm digital multimeter, such as this keithley dmm7510 from tektronix, is a musthave instrument for motor testing. Induction motor testing and evaluation plant services. Alongside the iron core, the main components are the primary winding, the. If manufacturers intend to test electrical machinery on their own responsibility, apart from compliance with other requirements type testing is conditional. Similarly the range of ammeter and voltmeter during blocked rotor test, 10a, 250v. Power control centre, motor control centre, synchronization panel turnkey contracts. They can be quite different for one motor or machine tested three days in a row, yet not mean bad insulation.