MIL-HDBK-1025/10
Parallel Operation
9.4.5
WARNING
Parallel operation of the ship and shore systems may be done only as given below.
a. Parallel operation of the ship generators and the shore power system is prohibited
except for short periods of time to allow for load transfer to or from shore power. Transfer time
should not exceed 10 seconds.
b. Paralleling shore transformers through the ship's electrical bus without prior activity
approval is a violation of safety practices and may result in circulating currents, overheated cables,
unbalanced loads, and excessive shore circuit current which could damage property and result in
personal injury.
Supporting Shore-to-Ship Safety Requirements. The previous sections cover
9.5
the general electrical safety requirements for operating and maintaining shore electrical
distribution systems. The unique power cable connection/disconnection operations for shore-to-
ship electrical power service requires specialized training and appropriate SOP's.
9.5.1 Specialized Shore-to-Ship System Training. Qualifying for this work requires
training that addresses the operation, maintenance, and testing of the power cable/connector
assemblies; the ability to connect cable extensions; and the understanding of cable phasing and
paralleling checking methods. Workers should also be able to lay and protect cables on piers and
to operate cable rigging devices at both the ship's cable access ports and at the cable storage
areas. They should be familiar with operating the ungrounded electrical connection required to be
compatible with the ship's electrical system. Workers should be qualified for working on and be
familiar with the safety requirements for medium-voltage distribution systems supplying
substations and electrical power outlet assemblies supplying shore-to-ship electrical power.
Specific SOP's
9.5.2
Note
SOP's applying to this work should be based on requirements given
herein as adjusted for the activity's operating procedures. The SOP's
should address the following areas and be used in the day-to-day pre-job
briefing.
9.5.2.1 SOP Preparation Responsibility. The activity responsible for shore-to-ship
electrical service should prepare general SOP's with space for each individual organization
139
Previous Page
