See how to measure insulation resistance of electric motor running amps test with the motor running, check the full load amps fla with a suitable meter or preferably a clamp on meter and compare with the name plate fla. Designed to verify that the insulation of a product is adequate enough to withstand high voltage. The most common failure mode of a 3 phase ac motor is burnt winding or shorted winding leading to the damage of the motor. Whether it involves the connection cables, the sectioning and protection equipment, or the motors and generators, the electrical conductors are insulated using materials with high electrical. Ul ul674 electric motors and generators for use in hazardous locations easa ar1001998 recommended practice for the repair of rotating electrical apparatus ieee ieee std. The windings are marked with tags u1 and u2, v1 and v2, w1 and w2. Motordoc llc provides electrical machinery, electrical reliability and industrialcommercial consulting and training as well as the first continuous monitoring electrical and current signature analysis system and esa data collection systems. The purpose of this manual is to provide direction and to the greatest extent possible, to assure a safe work environment for all electrical employees. Test to obtain more reliable values ranges of both wattmeter should be 10a, 250v for blocked rotor test.
Electrical and motor machine 61 electrical and motor machine shop safety procedures this section has been formulated to set guidelines for all electrical work performed by this department. Electric motors consume 78% of all electrical energy in industrial processes, 43% of electrical energy in commercial buildings and 37% of the electrical energy in residential environments. A catalogue, for quick reference, of the range of megger test instruments for the maintenance of electrical power systems. The objective of these procedure is to specify minimum mandatory requirements and advisory guidance for identifying and controlling hazards to ensure zero harm with regard to operation maintenance and testing of electrical equipment. Electric motors have had a reputation for being a mix of science and magic. To obtain short circuit current and its power factor angle, block rotor test is performed on the motor. Dc motor analysis pdma a leader in electric motor testing. Guide for source inspection and quality surveillance of. Testing and commissioning procedure for electric motors eep. The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and systems provides much more realistic and useful values.
For a three phase motor, insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame earth using an insulation tester or megger. Similarly the range of ammeter and voltmeter during blocked rotor test, 10a, 250v. When a motor fails, it is often difficult to see why it failed just by looking at it. Motor current signature analysis mcsa is a proven and accepted method for determining the condition of a motors current carrying components. The page top photo was taken of of an oil burner electric motor not an air conditioning blower fan motor or pump motor, but youll see that all of these electric motors look a lot alike. Pdma corporation has developed these portable motor testers. Sometimes the trouble lies within the power supply.
Testing guidelines procedures 28 test equipment 29 choosing the right tester 29. Minimum test value of motor insulation resistance is 1 meg ohm 1 m. Open this load test procedure as a printable pdf file. The third party inspection for induction motor article provides a sample procedure instruction for induction motor testing and induction motor inspection in manufacturing shop. Many electric motor failures are caused by bearing failures. Inspection and test procedures of rotating machinery, synchronous motors and generators on photo. Jun 10, 2017 with a few simple ohm meter tests you can perform to see if you must remove your motor for service or if you can solve your problem. While a system with too large of motor may add too much weight, size, or cost to the system. Ieee std 1122004, ieee standard test procedure for.
Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. Model repair specifications for low voltage induction motors. A motor placed in storage may or may not work, regardless of its physical appearance. Test results of surge protection devices shall be in accordance with procedures for testing of lv surge arresters. The term motor used in this checklist refers to all kinds of motors ge produced which are stated in section 4 in this document.
A system with too small of motor may not be able to perform the intended task or may not meet the life requirements. Guide for the use of electric motor testing methods based on iec 6003421 p ll determined from residual loss 8. Often it is required to test the winding of the 3 phase windings with the aid of a multimeter or ohmmeter to determine whether the motor is still good or burnt or shorted. Applicable to tata power operating and project sites which cover but not limited to plant premises, switchyards, substations, offices. In the running configuration, the windings are joined with metal jumpers. Ieee std 1122004, ieee standard test procedure for polyphase.
In order to properly test the motor you must remove. Performed by stressing the insulation of the product far beyond what it would encounter during normal use. With an ohmmeter set to the resistance or ohms test setting, place test probes into the appropriate. Polarization index test pi value test along with insulation resistance test ir value test is conducted on hv electrical machine to determine service condition of the insulation. The following sections of the ansineta standard for acceptance testing specifications for. Motor power switching is done automatically by the system. Initial and date the results of the following instructions and tests on attachments to this procedure.
This document, concerning energy conservation program. This region is bounded by murky lines, but staying at this level enables tangible comments. Testers for electric motors and all kinds of windings schleich. When a threephase supply is given to the coils, then the.
Dc motor fault zone analysis is a vital part of any dc motor maintenance program. Maintenance tester for deenergized motors, generators and windings 8. The goal here is to describe the testing at a level above the physical attributes, such as temperature, pressure, force, and so on, but below the level of a final assembly inside of which the electric motor. The term nrtl now applies to many laboratories operating under osha occupational safety and health. Electric motor testing electrical engineering centre.
Electric motor efficiency under variable frequencies and loads pdf r06004. Companies across the globe trust our reliability solutions, products, and services. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Implementing a predictive maintenance program takes a pm program to the next level. Threephase dualvoltage motor insulation resistance testing.
Testing of a threephase electric motor has to be conducted in order to get continuous services from motors without any break down or failure. 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. This document contains proprietary information of general electric company, usa and is furnished to its customer solely to assist that customer in the installation, testing, operating andor maintenance of the equipment described. To determine whether a 3 phase motor is still good or has gone bad, a simple ohmmeter test across the windings of the motor will reveal its true state of health. In addition to conventional squirrel cage rotor testing methods such as the growler test, also covered will be. Doe proposes to amend 1 the existing test procedure for small electric motors by clarifying the existing scope and testing instructions, adding an authorized procedure incorporated by reference from ieee 1122017, and permitting the use of iec 6003421. Ac motor testing performed with pdma mce offline tester resistive imbalance during this test a dc voltage is applied to the motor. Post a question or comment about installing a hardstart capacitor to get an air conditioner motor, fan motor, or other electric motor running. Maintenance tester for deenergized motors, generators and windings. Home technical articles testing and commissioning procedure for electric motors scope of motor testing it should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. How to test a 3phase motor is discussed in this article. Inspection, testing and commissioning of electrical switchboards, circuit breakers. In this article we provide a diagnostic guide to determine and repair problems with electric motors. Naturally, the bearing temperature will increase by passing the time.
Inspection and test procedures for rotating machinery. Motor testing is a lowimpact, highvalue way to extend the life of your equipment. Hello everyone, i am niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a coast guard vessel. Regularly scheduled diagnostics and thorough troubleshooting. The motoranalyzer1 is a universal tester to inspect electric motors. How to test a 3 phase motor windings with an ohmmeter. Test procedures for electric motors, is a rulemaking action issued by the department of energy. From this voltage the actual resistances of the windings are measured.
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. The main purpose of the information that will be presented here is to describe many of the available tests that can be utilized under these different circumstances. Find here insulation testing and continuity, power protection, power transformer testing, power cable infrastructure, cable fault location, general electrical test. Electrical safety testing reference guide iso 9001 certified.
How to test three phase ac motors learning electrical. Electric motor repair, model repair specifications for low voltage motors, and motor repair tech brief were produced by the u. 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. Pdf electrical motor testing station with electromagnetic load. The goal here is to describe the testing at a level above the physical attributes, such as temperature, pressure, force, and so on, but below the level of a final assembly inside of which the electric motor resides. Lowcost portable unit, with all the major motor performance tests of the motorlab system. The vast majority of the electricity used by an electric motor drive system is consumed by the electric motor. Jul 06, 2016 testing electric motors doesnt have to be a mystery.
Neta developed specifications for the acceptance of. All safety materials and equipment warning signs, barricades, fire extinguisher, etc. If you are searching for rewinding of one phase motor you can find it here. Determine the motor parameters and the total core, friction and windage losses. Tester calibration 33 nist standards 33 120 kohm leakage impedance 33 tester applications 34 appliance testing 34 motor testing 34 transformer testing 35 electrical component testing 36. The first describes the testing of various electronic components, assemblies, and systems. Though it is not intended or expected, should any discrepancy occur between the document posted here and the document published in the federal register, the federal register publication controls.
Electric motor testing explained the electricity forum. 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. Insulation resistance failure of an electric motor is one of the first signs that the motor is about to fail. Megger guide to electrical insulation testing pdf instrumart. Test results of motor starter equipment shall be in accordance with. Testing manual for electrical equipment requirements are fulfilled. Abstract amongst many types of electrical motors, induction. This compilation is not intended as a complete survey of the field of electrical and electronic equipment testing. The basic steps in ascertaining the health of a threephase ac motor are given below. Visual inspection and electrical testing of the armature and fields give the maintenance personnel an understanding of the condition of the motor.
So when a motor fails to operate it may not be obvious what the problem is. Implementing a predictive maintenance program takes a. The three resistance readings of a threephase induction motor are compared and calculated to obtain the resistive imbalance. Testing can be conducted without interrupting the normal operation of the motor, and in fact should be performed when the motor is under a minimum of 70% load.
The locked rotor test is made at 15 hz to minimize the errors due to saturation and skin effects. Draw the approximate equivalent circuit for the motor lockrotor noload dc test v line 36. We are constantly doing what everyone else just talks about. Factory acceptance tests fat the routine tests shall be made with each electrical equipment and, whenever practicable. Ac electric motor troubleshooting guide test procedures. Improve the quality control of the project and simplify the procedures for engineers. The paper also describes a detailed procedure of design. The complete guide to electrical insulation testing. The established documentation for the elimination and control of hazards is henceforth referred to as electrical safety procedure. The electromagnetic load emulator ele is designed to be an adjustable load of an electric motor. Motor test for medium voltage mv and high voltage hv. Hipot test is the most common type of electrical safety test. It very important device to made production smoothly. This might result in unexpected motor failures when critical services from such motors are required affecting availability of plants.
Third party inspection for induction motor procedure. This study guide focuses primarily on the inspection of electrical material and equipment including. How to test a threephase motor with a megger hunker. The wire itself is usually copper or aluminum, which is known to be a good conductor of the electric current that powers your equipment. Jul 01, 2015 basic motor testing with multimeters and ammeters july 1, 2015 by david herres 12 comments when an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. We look at different motor types, methods for testing them, which megohmmeters to.
In insulation resistance test, a high dc voltage is. Tests using multivoltage megger insulation testers 42. Rtd circuits shall be in accordance with system design intent and machine protection device. This may cause severe problem to the load and entire system. Standard for acceptance testing specifications for.
Ip test is conducted especially to determine the dryness and cleanliness of the insulation. Inspection, testing and commissioning of electrical. Electrical testing association, 3050 old centre avenue, suite 102, portage, mi 49024. The induction motor shall run at the rated voltage and frequency, and each bearing temperature is measured periodically. The device is being used since 1889, popularity raised during 1920s, since long back devise is same in its uses and purpose of testing, few real improvement appeared in recent years with its design and quality of tester.
Does test procedures for electric motors are prescribed at. Test interphase resistance by disconnecting the leads from each terminal with a flathead screwdriver, then touch any two terminals with the two probes. To ensure the electrical motor condition is good or not,we must know how to testing it. Testing electric motors doesnt have to be a mystery. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. Department of energys office of industrial technologies oit with input from trade associations, consulting companies, manufacturers, nonprofit corporations, and others. Ansineta standard for acceptance testing specifications for electrical power equipment and systems, 2009. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Knowledge of the basics together with powerful new test equipment vastly simplifies the job. Standard for acceptance testing specifications for electrical. As shown below, the indicated terminal matrix blue lines shows the way the windings of a 3 phase motor should be tested with an ohmmeter. Tests results are provided graphically and tabulated. The term listed means controlled, monitored, and otherwise placed under formal surveillance by the approval agency or testing laboratory.