Hot-spot debate still heated

Article Abstract:

The issue on adopting an efficient model for hot-spot temperature monitoring continues to be one of the most debated topics in the electric industry. Studies revealed that hot-spot temperatures tend to rise and fall variably, a phenomenon which conventional models are not capable of addressing.

Evaluation, Equipment and supplies, Mathematical models, Temperature measurements, Temperature measurement

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How to stop ferroresonance

Article Abstract:

Ferroresonance is the tendency of an underground circuit to manifest minimal reactance-to-ground level due to the saturation of magnetic circuit. The phenomenon can be prevented from occurring by connecting a resistor along the secondary voltage transformer or installing it to broken delta.

Methods, Tuning (Electronics), Switched capacitor circuits

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Refurbishing LTCs

Article Abstract:

Pacific Gas & Electric Co, San Francisco, has made significant financial gains from the use of a load tap changer (LTC) upgrade program. Between 1988 and 1999 LTC maintenance costs decreased by 30%. In the same period average maintenance cycles increased by 50%.

Cover Story, PCG, Pacific Gas and Electric Co.

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