Bank’s High 9’s Infrastructure Saved from Disaster

The power system for this major NYC bank providing nationwide credit card and other financial transactions appeared to be performing satisfactorily. Fortunately, the proactive monitoring approach employed in this facility identified a power quality trend that could have caused a catastrophic failure. Non-symmetrical waveforms rich with even order harmonics indicate a problem in the powerContinue reading “Bank’s High 9’s Infrastructure Saved from Disaster”

24/7 Customer Service Center

In 2000, DHL Airways opened a new 24/7 customer service center to support its US customer base. To maximize uptime and ensure high reliability, a redundant UPS system was installed, protecting both the supply and the facility loads. Integral to the facility design was the Signature System power monitoring system from Dranetz-BMI installed on theContinue reading “24/7 Customer Service Center”

Loose Bus Bar Bolts Cause Sags

An administration building in a government complex in New Jersey had a transformer with a 4KV primary, 120/208V wye, 800A secondary. The buss duct ran up to a second-floor panel, which supplied an office area. Computer misoperations and lights flickering were occurring randomly for nearly two years. Emergency lighting was also flickering. Three voltages andContinue reading “Loose Bus Bar Bolts Cause Sags”

Textile Industry Evaluation

Despite their differences, continuous-process industries share underlying characteristics: they maintain continuous operations in facilities that represent substantial start-up costs and time but can be interrupted or disrupted by seemingly minor fluctuations in power quality. If the product stream is disrupted, lost productivity and lost product can create a large financial burden. For example, a voltageContinue reading “Textile Industry Evaluation”

Thumping Sounds in the Closet

Elevator control panels for the lower zone mid-rise elevators were on the nineteenth floor of a forty-story office building in a large midwestern city. It was fed with 480V transformer on the same floor, with the feeders to the controls rated at 800A. Excessive noise and vibration of the feeder wires and conduit were noticedContinue reading “Thumping Sounds in the Closet”

The Case of the Missing Contact

Executive SummaryDefiance Metal Products Company contracted with Electrotek Concepts to perform field measurements of their welding operations, and to make recommendations for remediation of Power Quality problems at the facility. The customer has been experiencing both major and minor electrical problems. The minor problems include occasional observable flicker in the overhead HID lighting system. TheContinue reading “The Case of the Missing Contact”

Computer on Shared Branch Circuit

Engineering laboratory adjacent to offices. A computer system used by laboratory personnel exhibited intermittent failures and data errors. Typically, these would start around 10 a.m. On some days there were no failures. A power monitor was installed at the panelboard serving the computer system. The monitor was connected, line-to-neutral (Channel A) and neutral-to-ground (Channel B).Continue reading “Computer on Shared Branch Circuit”

Manufacturing Process Unexpectedly Halted

This medium-sized manufacturing facility, located in an industrial park that experienced an unexplained shutdown of several adjustable speed drives (ASDs) , wreaking havoc on key process equipment. Each day, at approximately 6 am, the utility-owned PF capacitor kicks on to improve the voltage of inductive loads prevalent in many of the park’s manufacturing facilities. TheContinue reading “Manufacturing Process Unexpectedly Halted”

Utility Power Factor Capacitor Bank Switch Problem

A medical clinic in Las Vegas, Nevada, employing sensitive computed tomography (CT Scan) system. Power was brought to the system from a 480 volt service feeding a 480-to-208 volt isolation transformer. CT Scan system was experiencing repeated computer lockups and component failures. The medical equipment service company installed a power monitor on site to analyzeContinue reading “Utility Power Factor Capacitor Bank Switch Problem”

Elevator Control Problem

Newly constructed condominium building in Westchester County, NY. The condominium developer could not get the necessary permits for operation because the two building elevators would not run on the building’s emergency back-up generator. The problem was originally diagnosed as excessive voltage drop between the main service entrance in the basement and the tenth floor motorContinue reading “Elevator Control Problem”