Table of Contents
What is an acceptable reading on a Megger?
Anything reading between 2 megohms and 1000 megohms is usually considered a good reading, unless other problems have been noted. Anything less than 2 megohms indicates an insulation problem.
What is the accepted value of insulation resistance for a 1000v operating voltage?
The rule states that insulation resistance should be approximately one megohm for each 1000 volts of operating voltage, with a one megohm minimum. (By following this rule, a motor rated at 2400 volts should have a minimum insulation resistance of 2.4 megohms).
What is the Megger value?
The Megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. For good insulation, the resistance usually reads in the megohm range.
What is a good megger test result?
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. If the megger reads a resistance between 1-1.25 on your meter, then the cable passes. Any reading above 1.25 is considered excellent.
What is infinity on a megger?
If your megohmmeter is reading “OL” (over load) or “I” (infinity), these are commonly used readings on megohmmeters when the measurement exceeds the maximum indicated value of the tester.
What is a passing Megger test?
What’s a bad Megger reading?
What is a bad reading on a Megger test? 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. If the megger reads a resistance between 1-1.25 on your meter, then the cable passes.
What should be the value of a Megger test?
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. While using a megger test, you could be injured or damage equipment you are working on if the following MINIMUM safety precautions are not observed.
What’s the voltage of the Megger mit2500 insulation tester?
The MIT2500 offers both fixed range voltages of 50 V, 100V, 250 V, 500 V, 1000 V and 2500 V, as well as a variable range that allows any voltage between 50 V and 2500 V to be “dialled in”. This is supported by the new test voltage feedback control, which maintains the output test voltage to within 2% of the selected range, even when under test.
What do you use a Megger Megohmmeter for?
Megger Megohmmeter / Insulation Resistance Testers Megohmmeters, or Insulation Resistance (IR) Testers, are used to measure the resistance, integrity and safety of electrical wiring insulation. As electrical insulation breaks down, there are many hazards that can occur.
What should the Megger level be for a 33kV cable?
For doing a Megger test of a 33kV HT cable. The voltage level applied is of 5000V and the value of IR can be anywhere between 1GigaOhm to 200GigaOhm. When we are using a multimeter, we are measuring a resistance, voltage, and current.