Circuit breakers are used everywhere – in our homes, offices, and electric facilities. The degradation of the electrical insulation that is an integral component of these protective devices, can be influenced from both environmental and operational stresses. Additionally, oxidation and ware of circuit breaker contacts can lead to relatively high resistance connections and overheating of the circuit breaker. In the worst case, contacts can become welded together, thereby defeating the protective intent of the circuit breaker. This is why it is important to utilize the proper electrical test equipment when testing, to ensure that the circuit breaker is properly fulfilling its intended purpose.READ MORE >>
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A Megger (insulation resistance tester) is a type of electrical test equipment used to verify the effectiveness of insulation to act as a barrier between energized conductors, or between energized conductors and ground. It is critical to the reliability of the electrical power system that there is a way to know when insulation has been damaged or compromised in any way.READ MORE >>
Testing electrical insulation can be quick and easy when using test equipment specifically designed to perform insulation resistance measurements. A good insulator should have a very high resistance to current flow. Factors such as temperature, electrical and mechanical stresses, weather and moisture ingress are all capable of adversely impacting the characteristic qualities of materials that make them such good insulators. The degradation of these materials over time can result in unplanned outages, safety concerns for personnel and an overall degradation of power system reliability.READ MORE >>
An insulation resistance test is conducted to examine the effectiveness of insulation in a variety of electrical power system apparatus. Faulty electrical insulation is the source of dangerous shock hazards and can often cause ancillary damage to adjacent equipment as well. Routine electrical testing and maintenance can help to identify when insulation has deteriated before it reaches the point of failure, saving the expense of repairs and unplanned outages.READ MORE >>
The dielectric absorption ratio is the ratio of two time-resistance readings such as a 60-second reading divided by a 30-second reading. If the ratio is a 10-minute reading divided by a 1-minute reading, the value is called the polarization index. The principle behind the test is that the resistance would increase with time as the capacitive and polarizing currents begin to subside.
Unlike spot tests that are relative to specific conditions such as temperature each time that the test is performed, ratios of insulation resistance (Dielectric Absorption Ratio) that are taken at essentially the same time and temperature require no correction factor for comparison purposes.READ MORE >>
When evaluating the reliability of insulation, the Megger MIT1025 10kV Insulation Resistance Tester can be used to measure quality control at the time a piece of electrical equipment is produced, periodic preventive maintenance, and as a troubleshooting tool.
The Megger MIT1025 offers such advanced features as:READ MORE >>
The Megger MIT430-TC2 Insulation Resistance and Continuity Tester is designed specifically for use within the telecommunications industry.READ MORE >>
The Fluke 1587/MDT FC Advanced Motor and Drive Troubleshooting Kit includes a Fluke 1587 Insulation Multimeter FC 2-in-1 Insulation DMM, Fluke i400 Current Clamp, and a Fluke 9040 Phase Rotation Indicator.
The Fluke 1587 FC Insulation Multimeter features four diagnostic functions through the Fluke Connect Measurements application:READ MORE >>