Fluke's digital insulation resistance testers provide reliable results whether you work on motors, generators, cables, or switchgear Plot the corrected insulation resistance readings for each test on a chart for reference and trending. Megohmmeter (famous as Megger*) is an electrical instrument used to measure the electrical resistance of insulators. Download. Hunker.com If the megger reads a resistance under 1 (1,000 ohms) on your meter after the initial 60-second interval, the cable has failed and the cable should be removed. For the detailed technical specification of them please refer to the respective Data Sheets. Title: Interpreting Megger Readings Created Date: 11/2/2010 2:47:25 PM display uses the Megger digital/analogue arc, providing indication of fluctuating readings while the dual digital readout shows precise values of key measurements simultaneously with the test parameters, such as the output voltage on insulation testing as well as the resistance value in MΩ. Very often a megger is used to check the insulation of cable jackets, motors, and other high voltage (HV) equipment to ensure the safety of equipment. Good insulation shows a continual increase in resistance (see curve D) over a period of time (in the order of 5 to 10 minutes). Whether you use a Megger insulation tester monthly, twice a year, or once a year, it is important to be able to interpret the results. Note that for low resistance readings, more corrosion was found. Low megger readings Low megger readings rockman7892 (Electrical) (OP) 11 Nov 08 13:54. – is carefully covered with some form of electrical insulation. A senior tech once told me the Megger guard terminal is the same potential as the negative terminal. The corrected reading of 200 megohms from the above example is shown at months" in Figure 2. If some of the windings are shorted or you have bad connections, then the resistance readings … • Disconnect cables from equipment on both ends. Megger recommends that impedance measurements with the BITE2 or BITE2P be made part of a battery maintenance program with readings taken and recorded semiannually for flooded batteries and quarterly for VRLA. 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. For every 10 °C (18 °F) devia-tion above baseline temperature, the resistance value doubles. Setting Chart Limits Power DB. It is actually an insulation tester , but can be used for continuity tests. Oh yes, and I did forget to tell him that for general troubleshooting, it is a good idea to first take motor megger readings from the t-leads at the bottom of the controller, so that you also check the wire going to the motor from the controller at the same time. between two contact points. If you can’t find your desired Data Sheet below please contact us – we’re always happy to help out. Tests by this method are sometimes referred to as absorption tests. Megger Safety Precautions While using a megger, you could be injured or damage equipment you are working on if the following MINIMUM safety precautions are not observed. These value are very useful for determining insulation quality. 1000 ... Microsoft PowerPoint - GEQ Interpreting Megger Readings Guide 020520 Plot the corrected insulation resistance readings for each test on a chart for reference and trending. 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. If we choose Although all of its products are manufactured in the United States and England (Dallas, Texas; Valley Forge, Pennsylvania; and Dover, England), Megger is an international company with sales and technical offices throughout the world. Megger - The Complete Guide to Electrical Insulation Testing: Our thanks to Megger for allowing us to reprint the following. The recorded readings should be logged and com-pensated for temperature according to the selected baseline temperature. For tests we'll use MEGGER MIT 310. Megohmmeters, also known as insulation testers or “megger testers” measure resistance to determine current leakage and identify faulty insulation. At initial contact, a low resistance reading will be observed. 3.) Over time, ground The corrected reading of 200 megohms from the above example is shown at months" in Figure 2. This is caused by the absorption; good
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