Program 3

Project 1 - Supplemental Cable Tests and Improved System Grounding

The objectives of this investigation were twofold:

1. 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.
2. Evaluation of various grounding electrodes and comparison of impulse impedance to measured and calculated ground resistances.

Tagged: P1-3, P3, Equipment Testing/Evaluation, Power Quality, Engineering Guidelines

Project 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.)

Tagged: P2-3, P3, Equipment Testing/Evaluation, Power Quality, Engineering Guidelines

Project 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:

1. Optimal sizing and placement of distribution capacitors.
2. Tuned filters.
3. Grounded-wye delta transformers (to shunt zero-sequence harmonics).

Tagged: P3-3, P3, Equipment Testing/Evaluation, Power Quality, Engineering Guidelines

Project 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:

1. Single-phase padmounted transformers.
2. Three-phase padmounted transformers.

Tagged: P4-3, P3, Equipment Testing/Evaluation, Power Quality, Engineering Guidelines