Power Transformers

Utility Transformers

Power Transformers Health Check

Power transformers are static electric machines used to step-up or step-down voltage in electric power applications. The capital cost of a power transformer in the range of 100MVA can be $1M or more and by the time it is under operation, the price is increased. The average age of installed large...

Transformer Monitoring

Power Transformer Failures

Electric utilities maximize utilization of their assets, while maintaining reliability. Power transformers are typically reliable, but have been known to fail suddenly and/or prematurely. Transformer failures are both costly and can leave customers dissatisfied, harming the reputation of a utility....

Transformer Protection

Pennsylvania’s Yaw Bill

In a significant move for Pennsylvania’s energy sector, State Senator Gene Yaw has introduced a transformative piece of legislation aimed at modernizing the state's approach to power plant development and capacity management. The bill, which has been the subject of considerable discussion,...

Transformer Software & Technologies

The Role of Transformer Oil Alternatives in Improving Safety and Environmental Sustainability

The Growing Need for Safer and Greener Transformer Oils Transformer oil plays a vital role in the operation and longevity of power transformers, providing insulation, cooling, and arc suppression. Traditionally, mineral oil has been the industry standard due to its effective dielectric properties...

Transformer Testing & Maintenance

Sweep Frequency Response Analysis

Sweep frequency response analysis: Reliable demagnetization of transformer cores BY MARKUS PÜTTER, MICHAEL RÄDLER, BORIS UNTERER, OMICRON electronics GmbH Whenever a power or distribution transformer is isolated from the power system, it is very probable that residual magnetism remains in the...

Electrical Transformers

Prevent Transformer Shutdown

Power transformers seldom shutdown; however, if a shutdown occurs, the effects would be immediate and devastating to utility operations. According to “An Analysis of Transformer Failures” by William H. Bartley, P.E., on behalf of the Hartford Steam Boiler Inspection and Insurance Company, the...

Home Transformation Power Transformers

Transformer Core Grounds

Transformer core grounds: a different path to maintaining insulation systems

BY JAMES WHITE, Shermco Industries, Inc.

Power transformers are usually supplied with a ground from the core of the transformer to the tank (earth/ground). Smaller, dry-type transformers may not have this ground, but it is always used on larger transformers. Grounding a transformer’s core may not sound like a smart thing to do, but it is a very necessary part of the transformer’s...