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Measuring low resistance – which is usually taken to mean resistance of less than 1Ω – has many applications, from checking the condition of circuit breaker contacts to verifying the integrity of welds in metal structures. One very common question however is, “What’s the best test current to use?” As is usual with questions like this, there is no simple “one size fits all” answer.
Megger regularly collaborates with vendor-neutral training centers to provide the most experienced instructors so that students receive the best classroom learning experience. Read more about Megger’s instructor Marshal Bird at the Mesa Hotline School.
When a breaker fails to open contacts or interrupt current after receiving a tripping signal from a primary relay, we have a breaker failure. Most protection systems have a breaker-failure scheme and it is important to test this backup protection as part of your regular relay testing program.
Ground faults often develop in substation battery systems over time due to environmental factors and maintenance activities. Dirt and debris accumulated on battery surfaces can create electrical paths to the battery rack. Electrolyte residue due to cracking or crazing of the battery container also results in conduction paths to the battery rack. This application note will cover how to use the Megger BGL to trace and locate ground faults on a live DC system, without sectionalizing any circuits.
Insulation is used in cables to protect the conductor and to ensure that there is no connection between the two current carrying components of the cable – the conductor and the metal screen. Three commonly used dielectrics for High and Extra-High Voltage cables are impregnated multi-layered paper, oil filled paper and extruded polymer. A simple insulation resistance test is the easiest and fastest way to determine the insulation condition of both new and old cables.
DualGround™ is Megger's groundbreaking technology that enables a safer and faster workflow because both sides of the circuit breaker remain grounded throughout the test.
NIM1000: Megger's new Network Impedance Meter with 1 kA test current for preventive testing and exposure of hidden flaws.
Find out why a regular partial discharge testing program is one of the most convenient and cost effective early warning systems you can use to prevent disruptive faults in medium voltage substations.
There are many PD testers available on the market today and most are based on three fundamental sensor types. It is important to understand which sensor to use for your specific application.
Already among the fastest transformer turns ratio testers available, Megger's TTR300 series now feature upgraded firmware that cuts the typical test time in half, from 70 seconds to just 35 seconds for a three-phase result.
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