CAP Spotlight: Raytech: A Global Leader for Nearly 30 Years

NETA World StaffCorporate Alliance Corner, Summer 2024 Corporate Alliance Corner

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 …

Advancements in Industry: Shorted-Winding Technique for Single-Phase Exciting Current and Loss Testing

Mike Anderson, Doble Engineering CompanyCorporate Alliance Corner, Summer 2024 Corporate Alliance Corner

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 …

Advancements in Industry: Testing Substation Protective Relays without Tripping Circuit Breakers

Christopher Ness, MeggerCorporate Alliance Corner, Spring 2024 Corporate Alliance Corner

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 …

CAP Spotlight: Megger: A Global Leader for 130 Years

NETA World StaffCorporate Alliance Corner, Spring 2024 Corporate Alliance Corner

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 …

Advancements in Industry: Demagnetization of Power Transformer Cores

Thomas D. Sandri, Protec Equipment ResourcesCorporate Alliance Corner, Winter 2023 Corporate Alliance Corner

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. …

Advancements in the Industry — Voltage Dependencies of Power Factor in Rotating Machinery Insulation

Bret Hammonds, Protec Equipment ResourcesCorporate Alliance Corner, Fall 2023 Corporate Alliance Corner

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, …

Advancements in the Industry — Acceptance and Maintenance Testing for Medium-Voltage Electrical Power Cables — Part 3 of 3

Thomas D. Sandri, Protec Equipment ResourcesCorporate Alliance Corner, Summer 2023 Corporate Alliance Corner

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 …

Partner Spotlight — Protec Equipment Resources: Quality, Safety, Reliability

NETA World StaffCorporate Alliance Corner, Summer 2023 Corporate Alliance Corner

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 our continuing Partner Spotlight series, NETA talks to President Jason Henry about the thought leadership and subject-matter expertise at Protec Equipment Resources. Henry spent 26 years working for a NETA company, …

Advancements in the Industry: Acceptance and Maintenance Testing for Medium-Voltage Electrical Power Cables — Part 2 of 3

Thomas D. Sandri, Protec Equipment ResourcesCorporate Alliance Corner, Spring 2023 CAP Corner

In Part 1 of our three-part series on acceptance and maintenance testing for medium voltage electrical power cables, we reviewed cable construction and cable aging characteristics and started our discussions on cable testing options and philosophies. In Part 2 of this article, we move away from undervoltage testing and explore high potential testing techniques. HIGH POTENTIAL TESTING PERFORMED WITH DIRECT …