The general rule of thumb that is used for acceptable values for safe energisation is 1 MΩ per 1000 V of applied test voltage plus 1 MΩ. value megger reading just after 1 minute of the test, is-Megger value of 10 minute test, is Therefore, result of polarization index test, is From the above equation it is clear that, if the value of (I R + I S) >> I P, the PI of insulator approaches to 1. Proper cable maintenance through sheath testing can extend the life of the cable by preventing the long term damage caused by water ingress. The megger sends voltage through the cable to calculate the amount of current flowing through the cable jackets for an accurate indication of insulation integrity. Perform the test as instructed to make best use of VLF technology. Featuring groundbreaking performance, robustness and ease of use, our cable test products are designed to give you faster, more accurate results. I assume the test shall be done at 10 kV, 10 min; but I would like to know the acceptace criteria for this kind of test. The values I have used for 6.35/11kV Cu/XLPE/SWA/PVC cables in practice has been: 5kV "Megger" DC insulation test phase to earth for 2/3 Mins We are here for all of your electrical needs. What test voltage should I use? While using a megger, you could be injured or damage equipment you are working on if the following MINIMUM safety precautions are not observed. This intuitive and robust software interface simplifies the acquisition and management of your test data, giving you control of your Asset Management Process. testing 600 v cable T here are a variety of technologies and methods used to test the insulation of wire and cable, in-cluding high-potting, very low frequency (VLF), power factor, partial discharge, time-domain reflectom-etry (TDR), and “thumping.” Like a visit to the doctor’s office, each test examines the test item in a different way As current flow increases, to try to traverse the pocket, it creates heat. It is like taking a 10 minute megger reading. Reduced Risk of Emergency Power System Failure. The first applies to new equipment or cable and can use AC or DC test voltages. When VLF Withstand testing cable, the proper test voltage and time duration are critical for the success of the test. Step 1. They find cable faults that other instruments For doing a Megger of a 33kV HT cable. Available for PC, iOS and Android. The Electric Company has turned off your gas and electric and you are in the dark. IR is also measured for equipment body. The test is sensitive to arcs or corona so it often finds terminal spacing problems, over-mold problems, tolerance errors in IDC cables, or any problem that might produce arcs. This can be separated into mainly two categories: But there are another types of megger which is motor operated type which does not use battery to produce voltage it requires external source to rotate an electrical motor which in turn rotates the generator of the megger. Similarly, Megger Value after 10 minutes, R 10minute = V/( I R + I S) ………….I P = 0 after 10 minutes. Megger cable test equipment provides access to all of the technology needed to make informed cable management decisions through the different stages of the cable’s life cycle. Value of insulation resistance test or IR value test, i.e. … Another test we might do is called a Polarization Index test. Figure 4–Typical record of insulation resistance of a mill motor. ... and can also be saved as a pdf to be printed out on plain paper using a standard office printer. Refer to SWP SP0506 Substation Primary Plant and Secondary Systems Field Testing for information on control of hazards and risks associated with testing of high voltage cables. We verify the electrical insulation level of any device such as motor, cable, generator winding, or general electrical installation. Due to the low voltage, some punctures in insulation go undetected. Previous; Cable diagnostics; Cable fault location; High voltage cable testing; Circuit breakers. The test measurement values are affected by variables such as temperature, humidity, test voltage, and size of transformer. We can assist your certification and maintenance testing for predictive, diagnostic or routine purposes. Start a free trial now to save yourself time and money! Works perfectly even at very congested space. Megger is also called as a Megaohmmeter and is a device used for the testing of insulation resistance of a cable. Megger testing does not cause any damage, making it a good option when someone does not want to put holes in walls to test electrical insulation for any problems or issues. This test should be conducted before and after repair or when maintenance is performed. Insulation resistance quality of an electrical system degrades with time, environment condition i.e. Newly laid cables may be tested to reveal any faults arising from transportation or installation. Perform the test as instructed to make best use of VLF technology. It reflects the presence or absence of harmful contamination, dirt, moisture and gross degradation. To Use: Make sure no power is running to the heating system you are testing. The procedure of insulation resistance test or megger test are given below: First we will disconnect all the line and neutral terminals of the transformer. If a VLF test is too low in voltage and/or too short in duration, more harm than good may result. That heat may create enough temperature to actually cause another fire. Even when not required by the end customer, many wire and cable manufacturers use the insulation resistance test to track their insulation manufacturing …
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