Medium Voltage Application Guide

3.
ELECTRICAL SUPPLY
Electrical Supply
3.1 General
The main power supply to the plant shall be from the power supply authority at XXkV
All equipment provided under this Contract shall be suitable for continuous operation at the voltage
and conditions noted below. Compliance is required to clause 9.101 of IEC 62271-200; “Information
with enquiries and orders”
All equipment and work associated with the Contract shall be entirely suitable for operation on the
plant power supply systems as specified; and tabled below
Nominal voltage between phases
xxkV
Number of Phases 3
System fundamental frequency
TBA Hz
System Neutral
TBA
Design Fault Level
xx kA for xx sec
Loss of Service Continuity Category
TBA
Internal Arc Classification
TBA
3.2 Standards
The work, equipment and other items shall comply with the requirements of relevant IEC and other
nominated standards, codes and regulations; including those referenced throughout the
Specification and any other Authorities having jurisdiction over any portion of the work, and on the
method of performing such work.
Where there is any discrepancy between the referenced standards and this Specification (and
associated Contract Drawings), the requirements of this Specification (and associated Contract
Drawings) shall have precedence.
3.2.1 Switchgear
Designed to:
a) Switchgear and apparatus IEC62271-1
IEC62271-200
IEC62271-304
GB3906 (2006)
DL-T-404
DL-T-593
b) Internal arc resistance IEC62271-200
Annex A.6, criteria 1 to 5
c) Levels of insulation (coordination guide) IEC60071
d) Degrees of protection IEC60529
e) Seismic The Uniform Building code,
Section 1629.6.8
IEC60721-2-6, Table 1 for static
load test
f) Drilled holes and screw connections for busbars DIN43673-1
g) Classification of groups of environmental parameters
and their severities – Storage
IEC60721-3-1
h) Classification of groups of environmental parameters
and their severities – Transportation
i) Classification of groups of environmental parameters
and their severities –
Stationary use at weather protected locations
IEC60721-3-2
IEC60068-2-32
IEC60721-3-3
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