A power system is a complex network of key high-voltage components working in synchrony to provide electricity. Power transformers, which help step up and step down voltage so power can be transmitted over long distances, are designed to be in continuous operation. Hence, the life and reliability of transformers is of paramount importance. Multiple factors affect the life and performance …
NETA Corporate Alliance Partners (CAPs) are a group of industry-leading companies that have joined forces with NETA to work together toward a common aim: improving quality, safety, and electrical system reliability. In this ongoing NETA World series, we focus on the thought leadership behind these successful companies. This issue’s CAP Spotlight features an interview with David Koehler, Global Business Development …
NETA Corporate Alliance Partners (CAPs) are a group of industry-leading companies that have joined forces with NETA to work together toward a common aim: improving quality, safety, and electrical system reliability. In this NETA World series highlighting NETA’s Corporate Alliance Partners, we recognize Raytech U.S.A. and its contribution to advancing the industry. Raytech develops and produces high-quality measuring and testing equipment for …
The conventional exciting current and loss test is an open-circuit measurement of current and loss, typically performed from the high-voltage side of the transformer, using low voltage (up to 10 kV), single-phase, power frequency (50/60 Hz) excitation. For this test, the well-known approach to data analysis, first introduced in 1968, relies on comparison and evaluation of the per-phase readings against …
Imagine this scenario: You visit a local generating station that needs relay testing. They direct you to a switchyard relay house with microprocessor relays and test switches. The customer wants the relays tested, but the breakers are part of a bigger ring bus system that is powering loads to the city. The breakers cannot be tripped. What special considerations can …
NETA Corporate Alliance Partners (CAPs) are a group of industry-leading companies that have joined forces with NETA to work together toward a common aim: improving quality, safety, and electrical system reliability. In this continuing NETA World series highlighting NETA’s CAPs, we focus on the thought leadership behind these successful companies. Here, we visit with Dinesh Chhajer, Megger’s Director – Technical …
After a power or distribution transformer is disconnected from the power grid or when DC current is applied, such as when a routine winding resistance measurement test is performed, the transformer core is likely to have some remnant magnetism. This remnant magnetism will increase the magnitude of the already high inrush over current levels seen when a transformer is energized. …
Motors and generators are often critical components of electrical systems. They are used to automate numerous industrial processes, circulate liquids for cooling and lubrication purposes, and generate electricity to name only a few applications. If, for any reason, there is an unplanned interruption of these processes due to the failure of one of these rotating machines, the resulting damage, downtime, …
NETA’s Corporate Alliance Partners (CAPs) are industry-leading companies that have joined forces with NETA to work together toward a common aim: improving quality, safety, and electrical system reliability.
In Part 2 of our three-part series on acceptance and maintenance testing for medium-voltage electrical power cables, we explored high-potential testing techniques, including tests performed with direct current (DC) and alternating current (AC) performed at power frequency and at very low frequency (VLF). We also explored diagnostic testing and reviewed dissipation factor (tan delta) testing. In Part 3, we …