Induction motor is one of the most important motor used in industrial applications. 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. Then apply single phase 230 v ac supply across one of the hv winding. It is conducted on first prototype of product to confirm the design specifications. Induction motors can be started easily, robust in construction and almost maintenance free. Induction motors has the largest application in industry because of its inherent advantage over other types of motors. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Type tests for explosionprotected machines with type of protection device protection. You should also make a dc measurement of stator winding linetoline resistance using a dmm.
The induction motor testing routine testing or fat test is performed after completion. The type tests of the transformer confirm the main and basic design criteria of a production 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. 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. Polyphase induction machines are normally given a routine test, but they. Routine tests may comprise, functional tests mechanical operation test test on auxiliary equipmentverification of correct wiring. Information guide for general purpose industrial ac small and. Routine tests are carried out on every unit manufactured. Tests are required to check the condition of the induction motor and to.
This manual contains notices you have to observe in order to ensure. Routine tests may comprise, functional tests mechanical operation test test. This paper aims to represent routine test performing in three phase induction motor. Third party inspection for induction motor procedure. This test is not repeated on other products of same type. 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. Number of test is done on induction motor to check its different parameters. Induction motor testing routine testing or fat test. Qualification and type tests for type i electrical insulation systems used in rotating electrical machines fed from voltage converters.
Note down the machine ratings and calculate rated current of the machine noload test. 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. Record all nameplate information for the induction motor. Manufactured and tested in accordance with rules of iec 600341 and iec 6003421. The purpose of this test at induction motor testing is to measure the resistance of. Inprocess tests are performed prior to assembly of motor components. Noload and blocked rotor test on an induction machine aim theory. Pdf this paper describes a set of tests carried out on an induction motor for a 75 kw escalator. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. For example, routine test items defined in api 541 5th ed.
Search wegthreephaseinductionmotorsmasterline50019089. Third party inspection for induction motor visual inspection. All induction motors are tested before shipment from the factory. The set up for no load test of induction motor is shown in the figure. Testing of increased safety ht induction motor for.
In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Gradually apply three phase voltage across motor stator terminals via the autotransformer d. Type tests are done mainly in a prototype unit not in all manufactured units in a lot. The machine is started in the usual way and runs unloaded from normal voltage mains. Induction machines are considered relatively reliable and robust due to their simple design and welldeveloped manufacturing technology. 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. May 10, 20 type test of transformer confirms main and basic design criteria of a production lot. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36. What is the difference between type test and routine test. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. 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. However, on application electrical machinery may be type tested.
Routine tests confirm the proper functioning of the circuit breaker. In fact, it takes many years of experience to determine whether. The standardized tests fall into three major categories. 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 tests confirm the proper functioning of the circuit breaker. The endeavors are utilizing different kinds of circle winding machine. India also developed its own standard is 12615 2011. Ieee std 1122004, ieee standard test procedure for polyphase. Regulation of 3phase alternator by zpf and asa methods 9. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Abstract amongst many types of electrical motors, induction. However, depending on which one of the foregoing standards is applied to the motor, routine test items can vary in scope. The rotor will constantly be turning to align its magnetic field with that of the stator field. Electric motor testing explained the electricity forum. The routine test for motors in accordance with iec en 600341. 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. Stardelta starting of a three phase induction motor 10.
Routine tests and type tests of transformers electrical4u. To start induction motor by rotor resistance starter 8. Jul 06, 2016 the test generally applies between 100 and 5,000 v or more. Induction motor testing routine testing or fat test industrial. The motor was a squirrel cage induction motor, tefv. It is conducted on each product manufactured to confirm proper maufacturing of each and every units. 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. Locked rotor test at 200%, 150% and 100% of rated current iii. These motors account for 70% of the energy consumed by the industry. Disconnect any mechanical load connected to the induction motor. Subject to the rules for classification and construction of gl electrical machinery is not required to be type tested. The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. 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. Third party inspection for induction motor dimensional inspection.
If manufacturers intend to test electrical machinery on their own responsibility, apart from compliance with other requirements type testing is conditional. Ieee std 1121996 applies to induction motor testing. The basic idea of an electric motor is to generate two magnetic fields. Transformer testing type tests and routine tests of transformer. 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. The overspeed test is performed to make sure that rotor speed can reach to the 1. Information guide for general purpose industrial ac small. Induction motor theory quiz electrician practice tests. Noload and blocked rotor test on an induction machine aim. The following is a list of the routine tests carried out on all induction motors produced in the monfalcone factory.
These tests are performed to check the electrical or mechanical defects of the induction motor. 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. Comparison of routine test items and measurements by. In particular, the squirrelcage induction motors are widely used electric motor in home and industrial. 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. Rules for classification and construction vi additional. A singlephase induction motor with main winding arranged for direct connection to power source and auxiliary winding connected in series with a capacitor. The no load test of 3 phase induction motor is performed on induction motor when it is running without load. No load test of induction motor your electrical guide. 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. If the motor is kept in a place with high humidity, a periodical inspection is necessary. Testing of increased safety ht induction motor for hazardous area. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction. Dec 30, 2018 number of test is done on induction motor to check its different parameters.
The factory acceptance tests consist of routine, type tests and special tests project specific as per company and international standards. Circuit diagram for noload and blockedrotor test on 3 phase induction motor a. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. 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. These tests are performed to check the electrical or mechanical defects of the induction motor firstly check the components of motor like. The 3phase set of currents, each of equal magnitude and with a phase. Ieee std 1122004, ieee standard test procedure for. 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. Functional evaluation of insulation systems test procedures for formwound windings multifactor evaluation by endurance under simultaneous thermal and electrical stresses. This test tells us the magnitude of constant losses occurring in the motor. Routine tests of transformer is mainly for confirming the operational performance of the individual unit in a production lot. There are a lot of tests for electric motors, many dependent on the size of the motor.
Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. The induction motor is made up of the stator, or stationary windings, and the rotor. Determine the motor parameters and the total core, friction and windage losses. Free online electrician practice test questions on induction motor theory quiz leave a reply cancel reply. 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.