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Program
2
2-1 Field-Aged Cable Testing
The objectives of this research performed on field-aged
cable cross linked polyethylene cable samples, removed from service by DSTAR member
utilities, were to:
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Evaluate the linkage between impulse duty
and insulation degradation in field-aged cross linked polyethylene primary
distribution cable.
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Determine if a recently developed partial discharge site
detector can successfully assess cable insulation aging.
Deliverable: "Testing of Field Aged
Crosslinked Polyethlene Cable," Final Report, 8/4/92, Rev. 12/11/92.
2-2 Semi-Conductive Jacketed Cable Investigation
The responses of semi-conductive jacketed cable to the
following were investigated.
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Impulses originating on the overhead system.
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Lightning ground strokes near the cable trench.
Deliverable: "Semi-conductive
Jacketed Cable Investigation" Final Report, 4/1/91.
2-3 Switching Surges in Underground Distribution
Systems
Field tests, augmented by simulation studies, were
performed to:
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Characterize voltage transients generated by routine cable
and capacitor switching operations.
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Compare the performance provided by different switching
devices.
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Generate guidelines for switching practice and arrester
application which can minimize switching surge overvoltages applied to underground
distribution systems.
Deliverable: "Switching Surges in
Underground Distribution Systems," Final Report, 10/30/92.
2-4 Ferroresonance Guidelines for Modern
Transformer Applications
Based on extensive field tests, this research had the
following objectives:
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Characterize ferroresonant behavior when grounded-wye
padmount transformers are switched.
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Develop formulas for estimating ferroresonant overvoltage
magnitude as a function of transformer and cable parameters.
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Provide detailed guidelines specifying the maximum cable
length which can be switched with a given transformer without exceeding a critical
overvoltage magnitude.
Deliverable: "Ferroresonance
Guidelines for Modern Transformer Applications" Final Report, Volumes 1 & 2,
7/24/92.
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