The best and brightest in electrical testing and maintenance lit up PowerTest 2019, the premier electrical power systems event. The annual five-day conference hosted 503 session and 575 trade show attendees from March 11–15, 2019, at the Gaylord Texan Resort and Convention Center in Grapevine, Texas. PowerTest, the largest gathering of NETA Accredited Company representatives and industry professionals each year, …
Star Electrical Services & General Supplies, Inc. was established in 1999 and has become a leader in accurate, reliable, and professional solutions in electrical testing and high-voltage devices in Puerto Rico. The company is ISO 9001-2015 certified and is now the newest NETA Accredited Company (NAC) after satisfying the stringent requirements to become a full member. President Abelardo Hernandez is …
When it comes to electrical systems in industrial and commercial facilities and power plants, total system reliability is the top priority. An approach to electrical system service that encompasses both ac and dc power systems is required. AC and dc systems play an interconnected and equally critical role in ensuring overall reliability, and daily production and equipment protection require seamless …
ANSI/NETA MTS-2019 Revision Completed ANSI/NETA MTS, Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems, 2019 Edition, completed an American National Standard revision process in spring 2019. ANSI/NETA MTS-2019 supersedes the 2015 edition, having received ANSI approval as an American National Standard on February 4, 2019. A project intent notification was published in ANSI’s Standards Action …
DC winding resistance is a simple concept that relies on the fundamental application of Ohm’s Law. It is a powerful tool to determine continuity in power transformer winding circuits, specifically connections and tap changer contacts. However, performing a dc winding resistance test presents several technical difficulties that must be overcome: The power transformer’s magnetizing inductance must be removed through saturation …
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 our CAP Spotlight series, we look at what makes CAPs special and highlight some of their successes. To kick off this issue, NETA World interviewed Wayne Bishop Jr., …
Diagnosing the condition of complex systems such as high-voltage rotating machines has never been a simple task. Design requirements, the use of different materials, and demanding operating conditions require multiple off-line tests and on-line monitors to provide information on the machine’s condition. Some tests only yield simple measurement results without high diagnostic value. This article describes the application of various …
Multi-function protection relays calculate and use symmetrical components to enhance their performance during system faults. This can be illustrated in two specific examples: (1) zero-sequence current elimination for transformer differential protection and (2) negative-sequence current detection to inhibit out-of-step blocking. Zigzag Transformer Inside Transformer Differential Zone A shunt-connected zigzag transformer provides a zero-sequence current sink for ungrounded systems such as …
Everyone wears clothes, at least when out in public. However, not everyone needs to wear clothes specially designed and tested to protect them from hazards they could find in their workplace. If your employees work on or near electric power, generation, transmission, and distribution equipment, specialized clothing is necessary for certain tasks. OSHA 29 CFR 1910.269 states that employers must …
This month’s Tech Quiz takes a bit different look at NFPA 70E requirements. What is involved in electrical testing? As with most things, it’s not as simple as it may seem. 1. If you are a crew leader, what is the first thing you would do to test a transformer? a. De-energize it b. Isolate it by lockout/tagout (LOTO) c. …