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Program
3
3-1 Supplemental Cable Tests and Improved System
Grounding
The objectives of this investigation were twofold:
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Complete the investigation of the impulse performance of
insulated jacket, semi-conductive jacket, and bare concentric neutral cable. Included were
tests of induced currents from ground strokes and, for the two jacketed cable types,
neutral-ground voltages and the voltage required to puncture the jackets.
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Evaluation of various grounding electrodes and comparison of
impulse impedance to measured and calculated ground resistances.
Deliverable: "Supplemental Cable
Tests and Improved System Grounding" Final Report, 2/21/92 , revised 7/9/92.
3-2 Distribution Line Protection and Reliability
Develop software allowing members to evaluate various
overhead distribution line designs with respect to performance for direct and induced
lightning strokes. (Project terminated in early stages due to overlap with an ongoing EPRI
project with similar objectives.)
3-3 Mitigation of Distribution Feeder Harmonics by
Passive Techniques
Assess the effectiveness of passive techniques to mitigate
harmonics from distributed sources on residential feeders. Passive mitigations evaluated
included:
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Optimal sizing and placement of distribution capacitors.
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Tuned filters.
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Grounded-wye delta transformers (to shunt zero-sequence
harmonics).
Deliverable: "Mitigation of
Distribution Feeder Harmonics by Passive Techniques," final report 11/93.
3-4 Fault Energy Guidelines for Transformer
Enclosures
Establish critical fault energy withstand limits, above
which padmounted transformers are expected to experience tank deformation and leaks,
for:
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Single-phase padmounted transformers.
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Three-phase padmounted transformers.
Deliverable: "Pad Mounted Transformer Tank
Fault Withstand Capabilities", final report 4/98
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