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Category Archives: Transformer Testing & Maintenance

Transformer Testing & Maintenance

Utility Proactively Tests Underground Cable

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Distribution companies are continually looking for ways to improve system reliability, all while conserving capital investments and operational costs. With an aging infrastructure, one of the main issues that utilities face is a way to assess the actual condition of their capital assets.

With respect to underground cables, utilities can achieve enhanced reliability by developing a smarter asset management strategy. Historically, utilities used a reactive-based maintenance approach: when a cable fails, have it replaced. However, with increasing proportions of cables approaching end of life, this method is not sustainable because it consumes a significant portion of the operation and maintenance budget.  Simply put, for most utilities, not enough capital dollars are available to replace all of the aged cables. For this reason, utilities must employ an effective strategy to adopt condition-based maintenance to balance this issue.

Many utilities have switched to condition-based maintenance programs to more efficiently spend their capital budgets. Generally, utilities diagnose the health of a cable based on its age, and they expect cables to last 25 to 30 years. The age of a cable, however, is not always an indication of the cable’s quality.
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Transformer Testing & Maintenance

Sweep Frequency Response Analysis

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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 core due to the phase shift. However, residual magnetism also occurs when performing winding resistance tests. Since manufacturers use these measurements in their routine testing and these tests are typically performed for on-site condition assessment, transformers can be regularly influenced by the effect of residual magnetism.

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Transformer Testing & Maintenance

Renewable Insulation Liquids for Transformers

Image courtesy of Siemens

Turning electrical assets into green machines

BY RONNY FRITSCHE & GEORG PUKEL, Siemens AG

Transformers are one of the most important components of energy grid systems. They enable the efficient transport of electric energy from the location where the energy is generated to the location where the energy is needed. Transformers, especially power transformers, are conventional electric equipment based on physic concepts and materials developed decades ago, making it critical to implement new designs and new materials based on renewable resources used today to achieve sustainability, reliability and safety. Read more

Transformer Testing & Maintenance

Harmonic Problems in Power Transformers

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Preventing malfunction in power transformers

BY ANDY SAGL, Megger

Harmonics are another power quality phenomenon that can cause equipment to malfunction. Harmonics are a sinusoidal component of periodic waves that have frequencies that are multiples of the fundamental frequency. Harmonics can cause computer equipment to lock up or cause the data to become garbled as well as causing transformers, motors, and neutral lines to overheat. Read more

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