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【船级社】 KR Guidance for DC Distribution Systems.pdf
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【船级社】 KR Guidance for DC Distribution Systems.pdf
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2020
Guidance for
DC Distribution Systems
GC-29-E
KR
- i -
APPLICATION OF "GUIDANCE FOR DC DISTRIBUTION SYSTEMS"
1. Unless expressly specified otherwise, the requirements in the Guidance apply to ships
for which contracts for construction are signed on or after 1 July 2020.
2. The amendments to the Guidance for 2019 edition and their effective date are as fol-
lows;
Effective Date : 1 January 2020
CHAPTER 1 GENERAL
Section 1 General
- 103. has been amended.
- iii -
CONTENTS
CHAPTER 1 GENERAL ··········································································································· 1
Section 1 General ············································································································ 1
Section 2 Drawings and Data ······················································································· 3
CHAPTER 2 SYSTEM AND ELECTRICAL EQUIPMENT ··················································· 5
Section 1 System Design ······························································································ 5
Section 2 Electrical Equipment ··················································································· 12
CHAPTER 3 CONTROL SYSTEMS ··················································································· 17
Section 1 General ·········································································································· 17
Section 2 System Design ···························································································· 17
CHAPTER 4 CLASSIFICATION SURVEYS ······································································· 19
Section 1 General ·········································································································· 19
Section 2 Testing and Inspection ·············································································· 19
Section 3 Testing and Inspections of DC Circuit-breakers ································· 20
CHAPTER 5 RISK ASSESSMENT ····················································································· 21
Section 1 General ·········································································································· 21
Section 2 Risk Assessment ······················································································ 21
Ch 1 General Ch 1
Guidance for DC Distribution Systems 2020
1
CHAPTER 1 GENERAL
Section 1 General
101. Application
1. This Guidance apply to the ships intended to be registered as ships provided with DC distribution
systems.
2. This Guidance apply to ship’s electrical equipment and control systems supplying power for essential
services and services for habitability through DC distribution systems and include requirements for
design, installation and operation of DC distribution systems and related electrical equipment.
3. Items not specified in this Guidance are to be in accordance with each relevant requirement of
Rules for the Classification of Steel Ships except for the requirements inapplicable to DC distribution
systems.
4. Items not included in this Guidance may comply with ISO, IEC, KS or equivalent recognized stand-
ards by the appropriate consideration of the Society.
102. Definitions
The definitions of terms are to follow Rules for the Classification of Steel Ships, unless otherwise
specified in this Guidance.
1. "DC bus" means a DC distribution system that interconnects DC loads and power source.
2. "DC assembly" means a cabinet with modules interconnected with DC bus for load and power
source.
3. "Essential services" means those services essential for propulsion and steering, and safety of the
ship, which are made up of "primary essential services" and "secondary essential services".
Definitions and examples of such services are given in Pt 6, Ch 1, 101. 4 (13) of the Rules for the
Classification of Steel Ships.
4. "Services for habitability" means those services which need to be in operation for maintaining the
vessel's minimum comfort conditions for the crew and passengers. Examples of equipment for
maintaining conditions of habitability are given in Pt 6, Ch 1, 101. 4 (14) of the Rules for the
Classification of Steel Ships.
5. "Energy management system" means the upper management system of the battery system including
a monitoring and control system for energy capacity. When the function of the energy management
system is included in the power management system, the power management system is regarded
as an energy management system.
6. "Battery management system" means a device for monitoring the charge/discharge status to that
the battery can be efficiently managed by measuring the values of current, voltage, temperature,
etc. and for safely controlling the function of the battery such as operating the safety device in
case of abnormal operation.
7. "Battery system" means an independently operable device connected to the battery control device
and an assembly in which one or more modules or battery packs are connected in series or in
parallel. And battery system may include a power converter for charging/discharging the battery.
8. "Electric power converter" a device capable of both of the function of suppling power to the power
system by converting the designated DC power from the battery to AC or suppling power directly to
the AC load and the function to charge the battery by converting AC power from the power system
to DC.
9. "Inrush current" means a transient current that occurs instantaneously when power is supplied to the
electrical equipment.
10. "Common-mode noise" means an interference signal generated on the same phase.
11. "High frequency noise" means all signals whose frequency is greater than 1000 times the funda-
Ch 1 General Ch 1
2 Guidance for DC Distribution Systems 2020
mental frequency and whose voltage is less than or equal to twice the RMS value of the power
system, and includes a small level of impulse.
12. "IT system" means earthing system that isolates all energized parts from the earth or grounds one
point of the power supply to ground through an impedance to connect the exposed conductive parts
of the electrical equipment either individually or collectively or to the ground of the system.
13. "Insulation monitoring device (IMD)" means a device that monitors the insulation resistance of a IT
system.
14. "Insulation fault locator system (IFLS)" means a system that finds an insulation fault location in an
IT system.
15. "Arc flash" means a sort of air discharge phenomenon that can break down the insulation between
the charging conductors and cause a fire or a burn.
16. "Personal protective equipment (PPE)" means any device or apparatus that is worn to protect per-
sons from danger.
103. Equivalency
The equivalence of alternative and novel features which deviate from or are not directly applicable to
the Guidance is to be in accordance with Pt 1, Ch 1, 104. of Rules for the Classification of Steel
Ships.
(2020)
104. Modification of requirements
Since DC distribution technology will be under constant development, the requirements of this
Guidance may need to be supported by additional information and requirements, on a case by case
basis. Designs that are not in compliance with this Guidance may be approved after evaluation by
the Society, provided that it can be demonstrated that the design represents an equal or better lev-
el of safety.
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