Routine tests may comprise, functional tests mechanical operation test test on auxiliary equipmentverification of correct wiring. Disconnect any mechanical load connected to the induction motor. Record all nameplate information for the induction motor. These tests are performed to check the electrical or mechanical defects of the induction motor. It is conducted on each product manufactured to confirm proper maufacturing of each and every units. The following is a list of the routine tests carried out on all induction motors produced in the monfalcone factory. There are a lot of tests for electric motors, many dependent on the size of the motor. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation.
It is also done at site to ensure healthiness of a transformer that is to check loose connections, broken strands of conductor, high contact resistance in tap changers, high. The factory acceptance tests consist of routine, type tests and special tests project specific as per company and international standards. Induction motors has the largest application in industry because of its inherent advantage over other types of motors. Stardelta starting of a three phase induction motor 10. Subject to the rules for classification and construction of gl electrical machinery is not required to be type tested. Dec 30, 2018 number of test is done on induction motor to check its different parameters. Qualification and type tests for type i electrical insulation systems used in rotating electrical machines fed from voltage converters. Power frequency voltage test being the same as mentioned under the heading of type tests, the millivolt drop test is performed to determine the voltage drop within the current path of the breaker mechanism. Tests for asynchronous motors simotics type 1l, 1m, 1p, 1r, 1s, 1n reference manual this documentation pertains to factories nma and rhf edition 112019. Tests for asynchronous motors industry support siemens.
The routine test for motors in accordance with iec en 600341. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36. Third party inspection for induction motor dimensional inspection. Number of test is done on induction motor to check its different parameters. 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. May 10, 20 type test of transformer confirms main and basic design criteria of a production lot. The induction motor testing routine testing or fat test is performed after completion.
Ieee std 1121996 applies to induction motor testing. The induction motor is visually inspected for o utside view such as rust, scratch, and bruise, coasting color and finish, description on name plate, mounting direction of terminal box and protection type of frame. The rotor will constantly be turning to align its magnetic field with that of the stator field. Routine tests may comprise, functional tests mechanical operation test test. Abstract amongst many types of electrical motors, induction. Noload and blocked rotor test on an induction machine aim theory. A singlephase induction motor with main winding arranged for direct connection to power source and auxiliary winding connected in series with a capacitor. What is the difference between type test and routine test. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric.
The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. For example, routine test items defined in api 541 5th ed. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Third party inspection for induction motor visual inspection. Testing of increased safety ht induction motor for hazardous area. Gradually apply three phase voltage across motor stator terminals via the autotransformer d. Circuit diagram for noload and blockedrotor test on 3 phase induction motor a. The set up for no load test of induction motor is shown in the figure.
Induction motor testing routine testing or fat test. All induction motors are tested before shipment from the factory. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. The routine tests confirm the proper functioning of the circuit breaker. Locked rotor test at 200%, 150% and 100% of rated current iii. This test is not repeated on other products of same type. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. Note down the machine ratings and calculate rated current of the machine noload test.
The motor was a squirrel cage induction motor, tefv. For a motor suitable to this duty type, the rating, for test purposes, at which the machine may be operated at constant load until thermal equilibrium is reached and which results in the same stator winding temperature rise as the average temperature rise during one load cycle of the specified duty type. Induction motors can be started easily, robust in construction and almost maintenance free. In fact, it takes many years of experience to determine whether. Type tests are done mainly in a prototype unit not in all manufactured units in a lot. 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. Inprocess tests are performed prior to assembly of motor components. Search wegthreephaseinductionmotorsmasterline50019089. The machine is started in the usual way and runs unloaded from normal voltage mains. Induction motor theory quiz electrician practice tests. Type tests for explosionprotected machines with type of protection device protection. Tests are required to check the condition of the induction motor and to.
Pdf this paper describes a set of tests carried out on an induction motor for a 75 kw escalator. The standardized tests fall into three major categories. Determine the motor parameters and the total core, friction and windage losses. Then apply single phase 230 v ac supply across one of the hv winding.
This paper aims to represent routine test performing in three phase induction motor. These tests are performed to check the electrical or mechanical defects of the induction motor firstly check the components of motor like. Functional evaluation of insulation systems test procedures for formwound windings multifactor evaluation by endurance under simultaneous thermal and electrical stresses. It is conducted on first prototype of product to confirm the design specifications.
The type tests of the transformer confirm the main and basic design criteria of a production lot. Jul 06, 2016 the test generally applies between 100 and 5,000 v or more. Routine tests the primary purpose of the routine test is to insure freedom from electrical and mechanical defects, and to demonstrate by means of key tests the similarity of the motor to a standard motor of the same design. Transformer winding resistance measurement is carried out to calculate the i 2 r losses and to calculate winding temperature at the end of a temperature rise test. Regulation of 3phase alternator by zpf and asa methods 9. Information guide for general purpose industrial ac small. Electric motor testing explained the electricity forum. Induction motor testing routine testing or fat test industrial.
Ieee std 1122004, ieee standard test procedure for. The overspeed test is performed to make sure that rotor speed can reach to the 1. For instance, pretty much no one tests a 100hp or smaller motor on a dynamometer unless its a very, very special motor. The purpose of this test at induction motor testing is to measure the resistance of. You should also make a dc measurement of stator winding linetoline resistance using a dmm. However, on application electrical machinery may be type tested.
The endeavors are utilizing different kinds of circle winding machine. Comparison of routine test items and measurements by. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Testing of increased safety ht induction motor for. Third party inspection for induction motor procedure. Energy efficient induction motors three phase sqirrel cage, specifying the performance requirements and efficiency of 3 phase squirrel cage single speed induction motors based on iec 6003430 2008. Manufactured and tested in accordance with rules of iec 600341 and iec 6003421. Routine tests and type tests of transformers electrical4u. These motors account for 70% of the energy consumed by the industry. Rules for classification and construction vi additional. Induction motor is one of the most important motor used in industrial applications. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. No load test of induction motor your electrical guide. Information guide for general purpose industrial ac small and.
The no load test of 3 phase induction motor is performed on induction motor when it is running without load. If the motor is kept in a place with high humidity, a periodical inspection is necessary. It is practically impossible to determine rules for the actual minimum insulation resistance value of a motor because resistance varies according to method of construction, condition of insulation material used, rated voltage, size and type. Induction machines are considered relatively reliable and robust due to their simple design and welldeveloped manufacturing technology. This manual contains notices you have to observe in order to ensure. Routine tests are carried out on every unit manufactured. A routine test, as the name suggests, is normally or routinely done by the motor manufacturer on every motor whether the end user requests it or not. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Noload and blocked rotor test on an induction machine aim. However, depending on which one of the foregoing standards is applied to the motor, routine test items can vary in scope. The acceptance criteria shall be based on supplier approved motor routine testing procedure, but normally the calculated losses shall be less than of 110% of the theoretical loss. Routine tests confirm the proper functioning of the circuit breaker. This test tells us the magnitude of constant losses occurring in the motor. Polyphase induction machines are normally given a routine test, but they.
The basic idea of an electric motor is to generate two magnetic fields. India also developed its own standard is 12615 2011. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction. To start induction motor by rotor resistance starter 8. The 3phase set of currents, each of equal magnitude and with a phase. Ieee std 1122004, ieee standard test procedure for polyphase. Routine tests of transformer is mainly for confirming the operational performance of the individual unit in a production lot.
Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. If manufacturers intend to test electrical machinery on their own responsibility, apart from compliance with other requirements type testing is conditional. To obtain the variation of no load power and current and blocked rotor power and current with changes in the applied voltage to the stator. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. Test reports type test reports providing typical performance values for purchased motors, together with a copy of the inspection and testing report will be issued to customers on request. The induction motor is made up of the stator, or stationary windings, and the rotor. In particular, the squirrelcage induction motors are widely used electric motor in home and industrial. 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.
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