Introduction the purpose of this testing manual is to provide guidelines for inspection and testing of various electrical equipmentin compliance to relevant international standardsspecifications. Delivered in onsite case with 1 operating manual, 2 elbowedstraight. This manual refers to any one of the above as a remote device and refers to the three battery impedance testers as the bite. All reading will be recorded in qc06 quality assurance test report megger. Megger is the expert in cable test, diagnostics and fault location, supporting you with inhouse knowledge and welltrained application engineers. Insulation resistance testing megger testing southwire. Pd measurement using either vlf cosine rectangular test or damped ac voltage up to 40 or 60 kv rms datasheet pd loc partial discharge pinpointing system to precisely locate pd faults. This test is useful for the testing of internal cable resistance. Any voltage larger than this may stress the cable and cause premature failure. Megger testing procedures ieee electrical code issues. Electrical test equipment power station to plug megger. Megger 5 and 10kv insulation testers are used in a number of markets such as.
Where public access is possible, position safety observer and barricade exposed ends of cable during insulation test. Electrical test equipment application solutions from megger. Insulation resistance testing guide chauvin arnoux. Select the required test voltage with the selector keys. A guide to low resistance testing test equipment depot. The recommended minimum testing time for a simple withstand test on aged cable circuits is 30 min at 0. Unique combination system for cable test ing and pd diagnostics. Make sure the circuit is not reenergised whilst the instrument is connected. The word megger is a registered trademark a guide to diagnostic insulation testing above 1 kv test equipment depot 800.
Integral dielectrical diagnostics local partial discharge diagnostics 1 2 3 vlf sinus 34 vlf sinus 45 vlf sinus 62 tdm 45 vlf cr28 vlf cr40b p vlf cr60b p vlf cr60hp vlf cr80b p 10 kv xlpe cable with u test 18 kv rms 4 km 3,4 km 12 km 50km 40 km 30 55 km 20 30 km 100 km 50 75 km. Megger testing of instrument cables electric motors. It provides information on procedures and testing of major. Figure 3 echelle typique sur le testeur disolation megger. This test is intended for use to detect the condition of the winding inside the instrument. Megger bite 2 instruction manual pdf download manualslib. Wide range of megger technical guides, application notes, academic papers and product support material. A 1,000 volt dc megger test shall be performed on buses, motor starters, circuit breakers, and disconnect switches. Mft1700 series multifunction testers user manual net. As a necessary test to detect interturn insulation breakdown one of the most common early initiators of motor faults, motor insulation test voltages. Com 99 washington street melrose, ma 02176 phone 7816651400 toll free 18005178431 visit us at. Low voltage and high voltage cable testing low voltage xlpe. Threephase transformer turns ratio test set megger uk. The complete guide to electrical insulation testing.
Since the equipment being tested is low voltage equipment, these tests are typically performed using a 500 or v test voltage and will be familiar to all electrical maintenance personnel. Vlf cable test voltage ieee standard high voltage inc. Sep 22, 2019 carry out 500v megger test for phase to earth, neutral to earth, phase to neutral and phase to phase to measure the insulation resistance with all breakers in on positions. Megger employs some of the worlds greatest experts in cable test and diagnostics. Insulation resistance testing is a nondestructive test procedure. The narrow band dielectric frequency response nbdfr test method consists of a series of power factor measurements ranging from 1 to hertz. Bite 2, ebite and mbite battery impedance testers threephase ttr transformer turn ratio test set dart cable fault analysis system note. Pdf insulation resistance testing of low voltage cables.
Line terminal, guard terminal, and the earth terminal. Background the following is a summary of insulation resistance ir testing commonly referred to as megger testing of low voltage cables rated less than 5 kv, recognized by nexans. Request pdf low voltage and high voltage cable testing low voltage xlpe distribution cables. Download of saved results and logs via isolated usb cable mit525, mit1025, mit1525 only powerdb lite software included with mit525, mit1025 and mit1525. Only 15 kv rated megger test leads with plug inserts of 75 mm must only be used on the mit1525. Still certain minute voids are unavoidable and these remain in the insulation. This document is not part of a manual but it is published to the energy networks internet site. This test may be combined with the cable megger test by power testing the devices and terminated cables together. Electrical insulation testing of hv equipment up to 33kv. The circuit under test must be switched off, deenergised, isolated and checked to be safe before insulation test connections are made.
This document will focus only on the tests that are of importance for field installers which are described as installation and maintenance tests. Full compliance with this standard can be attained with just one tester, the mit10202. That is, with the same test connections and with the same test voltage applied for the same length of time. Some tests and procedures may be performed by specialists during the assembly phase. Our products support damped ac dac, sinusoidal ac and cosinerectangular test technologies. Download the latest lvi and get catalogue and discover the latest electrical test equipment used by the engineers and electricians of today. We know we can check any cable or equipment by testing insulation and by. Megger makes electrical test equipment to help you install, improve efficiency and extend the life of electrical assets and cable networks at high, medium and low voltage. The test measures the insulation resistance between the phases andor between phase and ground. Low voltage test equipment catalogue 2017 megger pdf. Commissioning tests for hv cables up to 33kv swp ergon energy. The dc cable test is primarily utilized to determine if gross problems exist on new cable systems damage. Software to download test results from mit330, mit430, mit485, mit4002 and mit2500 test instruments.
Additionally this update will force the slider bars to be wide for improved touch screen usage. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. A megger tests a wire by applying a high voltage dc to it for a certain time period so that the insulation quality can be determined. In this video we explain how to check cable insulation with megger or megaohm meter. Megger test report fill out and sign printable pdf template. The purpose of a surge lighting arrester is to limit the over voltages that may occur across transformers and other electrical apparatus due either to lightning or switching surges. This is one of the famous methods used for the testing of resistance and it was first introduced in 1903. Power factor testing of power and distribution transformers the transformer is probably one of the most useful electrical devices ever invented. Megger guide to electrical insulation testing pdf instrumart. Fat procedure for lv switchboards electrical engineering portal. View and download megger mit515 user manual online.
Any instrument returned for recalibration will be updated with the latest firmware and software. The overall test procedures are defined as follows. A guide to diagnostic insulation testing above 1 kv. Megger download software included allowing further. A megger is comprised of a dc generator and an ohm meter. In the above circuit, the guard is connected on top of an insulator, the line terminal is connected to the conductor, which is to be tested, and the earth pin is grounded. The magnitude of the discharge in such voids is measured so as to determine. Chapter 11 watthour test 290 chapter 12a power cable test 298 chapter 12b seba cable test 308 other megger products you may find useful 340 what cat ratings mean 341 about megger 342 environmental care and service 344 training local to you 345 index 346. Megger safety precautions when you use a megger, you could be injured or damage equipment you are working on if the following minimum safety precautions are not observed. Jul 24, 2018 the reporting device that is additionally meant to create and render reports in the web will consistently be there to build the reports that you requirement for your framework. Category megger testing southwire industrial tech blog. Aug 01, 2019 the name megaohm meter is classified further into the name megger.
Megger and power factor windings, bushing and arrestors. Like a visit to the doctors office, each test examines the test item in a different way. A megger is used to check the insulation resistance of the electrical equipment. Jan 08, 2019 in modern megger as shown in figure above these range can be selected. Download pdf rotating machinery testing solutions electric motors are made up several of components that when combined and assembled into a motor have to endure extreme electrical and mechanical operating stress as well as varying environmental conditions during their service life. The name megaohm meter is classified further into the name megger. This aggregate of the chl primary to secondary measurements constitutes the dielectric response of the test specimen. Delivered in onsite case with 1 operating manual, 2 elbowedstraight pvc.
The mit2500 insulation and continuity tester has been designed for motor and cable testing. Transformer turns ratio ttr is one of the most common test used to assess the condition of the transformers windings and core. Insulation resistance tests megger test are carried out on all windings, core and core clamping bolts. A continuity check shall be performed on motor control circuits and control panel internal wiring. It is performed as a part of acceptance and maintenance test procedure to determine any problems due to poor design, assembly, handling, overloading, fault conditions or poor maintenance.
So we can use a megger to test a motor, generator winding, cable, etc. Recommendations megger recommends that you return your instrument annually for calibration verification. This document details powersystems requirements for electrical testing of hv equipment up to and including 33kv. Pdf insulation resistance testing of low voltage cables in. Insulation resistance testing of low voltage cables in the field. Test instruments for the maintenance of electrical power. Insulation resistance testing of low voltage cables in the. Refer to swp sp0506 substation primary plant and secondary systems field testing for information on control of hazards and. The following is a summary of insulation resistance ir testing commonly referred to as megger testing of low voltage cables rated less than 5 kv, recognized by nexans. Apr 24, 2019 insulation resistance testing is a nondestructive test procedure.
R value improvement to be done all tests results are acceptabledesired values 177. The circuit under test must be switched off, deenergised and isolated before test connections are made when carrying out insulation and continuity tests. Position hv test in progress signs at all ends of the hv cable prior to testing. Download pdf read full article the importance and benefits of portable testing a portable appliance tester pat is an instrument that is dedicated solely to the safety testing of portable electrical equipment in accordance with recognized national and local standards. In the above circuit, the guard is connected on top of an insulator, the line terminal is connected to the conductor, which is. Use meggers on high resistance measurements only such as insulation measurements or to check two separate conductors on a cable. Perform the test as instructed to make best use of vlf technology. Insulation resistance cables shall be tested for insulation. Clamp the alligator clip on one of the megger probes to the wire or cable, touch the other probe to the exposed conductor and press the test button. Power factor testing of surge lighting arresters megger. Sep 26, 2018 locate the connection point of the wire or cable you want to test so you have access to the exposed conductors. The bm21 timer can be used to set the duration of test, and will automatically stop the output voltage when the time has expired. There are a variety of technologies and methods used to test the insulation of wire and cable, in. Fill out, securely sign, print or email your megger test report form instantly with signnow.
Refer to swp sp0506 substation primary plant and secondary systems field testing for information on. This guide explains the many types of transformer and the power factor test procedures for each one. This guide explains the power factor test procedure of these surge arresters. At the end of a test, capacitive loads are discharged automatically and the decaying voltage is displayed as the value returns to zero. This video describes how to do continuity and megger testing of busbar before energizing. When vlf withstand testing cable, the proper test voltage and time duration are critical for the success of the test. To start a test, press the red test button for more than one second. The standard megger testing equipment is used, the line terminal of which is connected to the winding or core bolt under test. Ieee std 432000 recommends a procedure for measuring insulation. Mechanical damage such as hitting a cable while digging. What is the megger test procedure for transformers.
613 632 132 9 1139 526 531 898 396 1454 770 1128 1327 1575 51 571 898 1578 761 932 379 1011 912 1336 225 1088 1059 1107 133 861 1212 710 891 533 1574 777 233 78