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Insulation plays a very important role in an electrical system. Without electrical insulation, the electricity flowing in the conductors is exposed to short circuit to other conductors or create the risk of electrocution to personnel. It is important to always check the integrity of insulation to ensure the safety and reliability.READ MORE >>
The capacitor discharge technique is performed with a surge generator, nicknamed “thumper.” This device converts line power into high voltage, unidirectional, impulses that are transmitted into a faulted power cable. A simplified circuit of a surge generator connected to a faulted cable is shown in Figure 1.
Figure 1.READ MORE >>
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 >>
A Digital Low Resistance Ohmmeter or DLRO is used to measure the resistance of circuit breaker contacts, welded joints, terminal connections and other bonded surfaces. The resistance measurements are sensitive enough to detect very small changes in test samples. For example, they provide users with the ability to identify loose connections, corrosion or the presence of other contaminants.READ MORE >>
Time domain reflectometers are tools that can help make cable troubleshooting faster and easier. Instead of spending time and effort finding faults manually, these devices can localize the fault within seconds. These testers are especially valuable on cable installations that are several miles long. They are not only suitable for cable fault location in electrical systems but also in telecommunications, television and computer network facilities.READ MORE >>
The Megger SG32-1500M Power Cable Fault Locator is a portable cable fault location and high voltage test system designed to provide quick, effective, accurate and safe fault location, thereby reducing system outages and time lost.
The Megger SG32-1500M is housed in a rugged yet portable enclosure, which makes it suitable for use in and outdoor conditions.READ MORE >>
With the advancement in ground resistance measurement technologies, much of the test equipment currently available for this purpose now provide the convenience of Clamp-On technologies that are in some applications preferable to the traditional 2-3 point testing methods. These clamp-on ground resistance meters provide the potential to save valuable time and effort by inducing a current into the ground through electromagnetic coupling. The jaws then sense the voltage drop around the loop and automatically calculate the ground resistance using Ohm's Law.READ MORE >>