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7.0 Electrical Installation
NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer
on page v of this document.
DOC012R02 AOC 15/50 User Manual Nov 2001
56
CAUTION
AFTER THE POWER COLLECTION INTERFACE HAS BEEN
INSTALLED, ALL POWER CABLES AND WIRES TO THE WIND
TURBINE MUST BE DE-ENERGIZED. ALL ELECTRIC
DISCONNECTS FEEDING INTO THE WIND TURBINE MUST BE
LOCKED OUT AND TAGGED OUT.
7.2 Wiring and Cable Requirements
The following sections discuss the power, control and anemometer cable requirements.
7.2.1 Power and Control Cable
The power cable for an AOC 15/50 must be of a sufficient ampacity rating to carry the rated
generator current (86 Amperes). The National Electrical Code and the IEC Code list the
ampacity of various cable types.
The minimum cable sizes (see Appendix M) were calculated based on general assumptions
regarding service transformer rating and utility line capacity. Cable sizes were also selected to
take varying distances between the tower and control boxes into account. They are meant for
general planning only and should not replace site specific electrical engineering.
The power cable must be of appropriate insulation and construction to satisfy national and local
electrical code specifications for the specific distribution system. AOC does not recommend the
use of direct buried cable, unless it is armored, due to the increased potential for faults.
It is necessary to consider the economics associated with increasing power cable size from the
minimum required, in order to increase the net energy output (in kWh) of the wind system
through reduced line losses. The increase in revenue from a larger cable must be weighed
against its higher initial cost. Determining the optimum cable size requires the following:
• Consideration of initial expenditures
• Effects of line loss on kWh production
• Projections of kWh production over time
• Interest rates as a reference in determining the economic value of increased initial
investment
Figure 7-2 depicts the typical layout of the electrical enclosures with the dynamic brake boxes
located near the main enclosure. Whenever holes (knockouts) are drilled through electrical boxes
for a conduit installation the edges of the holes must be coated to prevent adverse corrosion.
Please contact a professional engineer, AOC or an authorized representative, for further
assistance in designing a suitable power distribution system.