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Guide for High Voltage Shore Connection GUIDE FOR HIGH VOLTAGE SHORE CONNECTION

Guide for High Voltage Shore Connection GUIDE FOR HIGH VOLTAGE SHORE CONNECTION NOVEMBER 2011 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright © 2011 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA ii ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 Foreword Foreword It is envisaged that the effect of increasingly stricter air emissions legislation implemented through mainly local air quality controls will see an increasing number of vessels installing high voltage shore connection (HVSC) in the near future. Shore power supply facilities have adopted high voltage rather than low voltage by necessity in order to keep the physical size of related electrical equipment such as shore connection cables manageable. Inevitably high voltage would otherwise introduce new risks to ship’s crew and the shipboard installations if necessary safety features were not built into the HVSC system or safe operating procedures were not put in place. Accordingly, the requirements of this Guide have been developed with the primary focus on the safety of operating crews as well as for the security of the shipboard equipment. It should be noted that the requirements in this Guide have been developed in consideration of the joint effort by IEC, ISO and IEEE to establish an international standard for Cold Ironing – High Voltage Connection Systems which at the time of the issuance of this Guide is under development. The applicable edition of the Rules for Building and Classing Steel Vessels is to be used in association with the subject Guide. This Guide becomes effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of this Guide is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to 0rsd@eagle.org. ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 iii Table of Contents GUIDE FOR HIGH VOLTAGE SHORE CONNECTION CONTENTS 1 Application.......................................................................................................... 1 2 Objectives ........................................................................................................... 1 3 Classification Notation....................................................................................... 1 4 Plans and Data to be Submitted........................................................................ 1 5 Definitions........................................................................................................... 2 6 Alternative Arrangements.................................................................................. 2 7 System Design.................................................................................................... 2 7.1 Shore Power Compatibility...............................................................................2 7.2 Capacity ...........................................................................................................2 7.3 Grounding ........................................................................................................3 7.4 Circuit Protection..............................................................................................5 7.5 Short-circuit Level Compatibility.......................................................................5 7.6 Overvoltage Protection ....................................................................................5 7.7 Protective Device Coordination........................................................................5 7.8 Protection of Transformer ................................................................................5 7.9 Load Transfer...................................................................................................5 7.10 Failure Recovery Strategy ...............................................................................6 7.11 Safety Interlocks ..............................................................................................6 7.12 HVSC Circuit Breaker Control..........................................................................7 7.13 HVSC Emergency Shutdown...........................................................................7 7.14 Harmonics........................................................................................................7 7.15 Monitoring and Alarms.....................................................................................7 8 Equipment Design.............................................................................................. 8 8.1 General ............................................................................................................8 8.2 Protection Against Moisture and Condensation...............................................8 8.3 Air Clearance ...................................................................................................8 8.4 Creepage Distance ..........................................................................................8 8.5 Shore Connection Switchboard .......................................................................8 8.6 Onboard Receiving Switchboard .....................................................................8 8.7 Cable Management System.............................................................................9 8.8 Shore Connection Plugs and Receptacle........................................................9 8.9 Transformer......................................................................................................9 8.10 HV Cables........................................................................................................9 iv ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 9 Installations ........................................................................................................10 9.1 Equipment Locations .....................................................................................10 9.2 Voltage Segregation ......................................................................................10 9.3 HV Cable Installation .....................................................................................10 9.4 Storage...........................................................................................................11 10 Maintenance Plan ............................................................................................. 11 11 Operation Manual ............................................................................................. 11 12 Tests ..................................................................................................................11 12.1 HV Switchboard .............................................................................................12 12.2 HV Transformer..............................................................................................12 12.3 HV Cable Reel Slip Ring................................................................................12 12.4 Cable Test After Installation...........................................................................12 TABLE-1 Air Clearance..........................................................................................8 TABLE 2 AC Withstand Test ...............................................................................12 FIGURE 1 Example for Ungrounded LV Ship’s System..........................................3 FIGURE 2 Example for Grounded HV Ship’s System (where NGR Value is Compatible with the Ship’s Design Ground Current Range, Otherwise 1:1 Isolation Transformer may be Required) ........................4 FIGURE 3 Example for Ungrounded Ship’s System (e.g., Oil Carriers and Gas Carriers)..........................................................................................4 FIGURE 4 Example for Ungrounded Ship’s System where Shoreside Option for Ungrounded Neutral is Available (e.g., Oil Carriers and Gas Carriers)..........................................................................................5 FIGURE 5 Example of Plug and Socket, interlock by Pilot Contactor...................10 ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 1 1 Application Requirements in this Guide apply to vessels equipped with a high voltage shore connection system (HVCS) designed to power the vessel with the shore power alone, enabling the shipboard generators to be shut down while in port. The installation of a HVSC is optional, however if installed it is to be designed, installed and surveyed in accordance with this Guide, and when found satisfactory, a classification notation as specified in Section 3 will be granted. 2 Objectives The objective of this Guide is to provide requirements for the design, installation and survey of high voltage shore connection installations. The requirements in this Guide address: i) The safety of shipboard and, where applicable, shoreside personnel during the deployment and retrieval of the cable and when making the HV connection. ii) The safety of shipboard personnel during the period in which the vessel is operating using the established HV shoreside connection. iii) The safety of the shipboard personnel should the HV connection malfunction. iv) The safety of shipboard personnel and shoreside staff as applicable at the time the HV connection between the vessel and the shoreside supply is disconnected. v) Requirements for the safe storage of the HV equipment and associated connections when the vessel is on voyage or in ports where no HV connection is established. These objectives are to be achieved by means of the system design, the construction of the HV equipment and operating safety procedures. 3 Classification Notation A vessel with a high voltage shore connection installation which is found to be in compliance with the requirements in this Guide will be assigned the classification notation HVSC. 4 Plans and Data to be Submitted The following plans and data are to be submitted: i) One-line diagram showing shipboard elements of the HVSC ii) Descriptions of Electrical System Grounding philosophy (See Section 5 and 7.3.3) iii) Descriptions of instrumentation, monitoring and alarms iv) Short-circuit current calculations for each shore facility v) Protection device coordination study for each shore facility vi) Load analysis vii) Capacity rating of HVSC installation, including maximum design short-circuit level viii) Details of shore connection switchboard, including outline view, internal arrangement, dimensions, IP rating, circuit breaker rating, socket rating and schematics ix) Details of transformer including kVA rating, impedance information and construction details 2 ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 x) Cable specifications xi) Details of portions of the ship’s main switchboard that are associated with the HVSC interface xii) Descriptions of the automatic synchronization system for the temporary generator parallel running of ship’s generator and the shore power, if fitted xiii) Descriptions of safety interlocks (See 7.11) xiv) Details of the cable management system, if installed xv) Equipment locations, including the routing of HV cables xvi) Operation manual as required by Section 11 5 Definitions High Voltage Shore Connection (HVSC) Installation: Those onboard systems that are designed to accept high voltage shore power, typically involving incoming power receptacles, shore connection switchgear, step-down transformer or isolation transformer, fixed power cables, incoming switchgear at the main switchboard and associated instrumentation. HVSC is often referred to as Cold Ironing or Alternative Marine Power. High Voltage (HV): For the purpose of this Guide, the system nominal voltage is considered to be in the range from 1 kV AC to 15 kV AC. Electrical System Grounding Philosophy: The manner in which electrical system is grounded (e.g., ungrounded system, solid neutral grounding system, low impedance neutral grounding system, or high impedance neutral grounding system), including ground potential transformer method. Circuit protection strategy is built around the selected method of system grounding in terms of over voltage prevention, over current prevention or continued operability under single phase grounded condition. Cable Management System: The cable management system is the ship’s interface point with the shore power system. The cable management system is typically composed of flexible HV cables with the plug that extends to the shore power receptacle, cable reel, automatic tension control system with associated control gears, and instrumentation. Shore power is fed to the shore connection switchboard via the cable management system. Shore Connection Switchboard: Where no cable management system is provided onboard, the shore connection switchboard is normally the ship’s interface point with the shore power system. HV shore power is connected to this shore connection switchboard by means of an HV plug and socket arrangement. The shore connection switchboard is provided with a shore power connecting circuit breaker with circuit protection devices. Onboard Receiving Switchboard: The receiving switchboard is normally a part of the ship’s main switchboard to which the shore power is fed from the shore connection switchboard. 6 Alternative Arrangements Alternative arrangements that differ from the specific requirements in this Guide and that provide an equivalent level of safety may be considered on their technical merits. 7 System Design 7.1 Shore Power Compatibility Means to check shore power compatibility (e.g., correct voltage range, frequency and phase rotation) are to be provided at the location from which the HVSC circuit breakers are controlled (e.g., at the control station in the engine control room). ABS GUIDE FOR HIGH VOLTAGE SHORE CONNECTION . 2011 3 7.2 Capacity HVSC installation is to be sufficiently rated to supply the following: i) Normal services required in port ii) Emergency services iii) Services needed to uploads/s3/ high-voltage-shore-connection-guide-for 1 .pdf