0
A megger is an electrical instrument that is used to measure the resistance of insulation by applying a DC voltage to the conductor. One lead is connected to the conductor and the other lead is connected to ground. Safe insulation reading to ground should be above 2,000,000 ohms or 2 megs.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoMegger was used to check the insulation resistance for power cables & winding & any electrical equipments.
Add your answer:
Earn +20 pts
What is the standard reading in megger testing to conclude that the equipment is passed and or failed?
Meggers send voltage thru the cables to determine the resistance between, meggers like the mj145 have multiple settings from 100 volts to 1000v, a Megger showing a good reading will show megaohms thru its full band, a bad one reading will be indicated by it either reading 0 ohms or less then 30 ohms (depends on the circuit and what's between the wires) a bad indicator can also be a steady reading at low voltage then at higher voltage it spikes to a low ohm, or a low voltage, like as if u just created a short. What that shows is at low voltage your insulator is fine, but at high voltage it blows thru it, normally that means your Insolator around your wire is damaged.
Why digital multimeter fails to read low resistance values?
They read low resistance values very well. I measured several dead shorts today accurately with a digital voltmeter. However, when attempting to measure LARGE amount of resistance, the current generator in a standard digital voltmeter may fail to effectively penetrate the medium being measured. It is for this reason that Meggers (Mega-Ohmmeters) are used to measure high amounts of resistance. They usually employ a hand crank to develop the current needed to effectively flow through the medium being measured. Sometimes digital voltmeters can be very inaccurate if they are measuring something that matches the impedance of the meter (loading effects of the voltmeter), but that is another story.
What is megger and how does it work?
Purpose: The megger tests the integrity of the insulation between conductors that run side by side and do not physically meet or connect. Meggers or Mega-ohm testers also are typically used to test the dielectric in coaxial cable. Meggers are used to test the insulation of buried cables by placing a lead to earth ground and one lead to the outer conductor of a coax cable or any or all conductors of multiple (more than one) buried wires. Method: introduce a high enough voltage to the conductors eventually the current will travel betwen the conductors. Read the indicator to see the amount of resistence to current flow on the meter indicator. the reading will generally be in millions of Ohms (megohms)
What is the birth name of Jack Meggers?
Jack Meggers's birth name is John Gerald Meggers II.
When was Betty Meggers born?
Betty Meggers was born in 1921.
When was William Frederick Meggers born?
William Frederick Meggers was born in 1888.
When did William Frederick Meggers die?
William Frederick Meggers died in 1968.
What does n mean in a text?
N means no. (: Meggers!
What nicknames does Meg Tilly go by?
Meg Tilly goes by Meggers.
What nicknames does Heather Lawver go by?
Heather Lawver goes by Meggers.
How did Betty Meggers become famous?
Betty Meggers became famous by being an American archeologist. She is recognized as a archeologist enthusiast alongside her husband and has been involved in the study of many Native American burial sites.
How do you test a dc motor with a mega meter?
A megameter, or a Megger as it is commonly called, is used to measure the insulation resistance of cables and other electrical equipment. The measured value is in mega ohms. Hence the term Megger. Most meggers generate 500 Volts DC supply, but their current capacity remains low. When the two terminals of a megameter is connected to across the equipment to be tested, the high voltage gets leaked into the equipment. The resistance is inversely proportional to the current flowing through the equipment under test. Originally, most meggers were analog in nature, and were generating high voltage using a dynamo, when the lever is rotated at high speed. Today most meggers available are digital, and can generate 500 volts as well as 1000V. Some meggers have winding resistance testing facility as well, and hence can be used as a single tool to test the resistance of a motor in ohms as well as in Megaohms. Meggers used for checking high resistance like that of mains transformrs, generate much higher voltages and are generally analog type.
What actors and actresses appeared in Alter Ego - 2005?
The cast of Alter Ego - 2005 includes: Drew Donovan Mary McNeill Jack Meggers
What does n mean in a text symbol?
In a text symbol, "n" often stands for "and" or it can be used as a shorthand way to say "in." It is commonly used in informal written communication to save time and characters.
Why you use DC in megger?
There are different types of megger, which is simply a trade name for a range of different instruments. Not all meggers use d.c., for example, an earth-resistance megger uses a.c. On the other hand, an insulation-resistance megger uses d.c. because it applies a constant test voltage across the insulation being tested.
