Seminar on Shipboard Electrical Power System design

 Date: December 22, 2015

 Location:

NMCI (Bangladesh) Ltd.

Hometown Complex (11th Floor), 87 New Eskaton

Dhaka 1000, Bangladesh.

Tel. +880 2 832 2991 (Auto Hunting)

+880 2 831 1851, +880 2 935 9516, +880 2 831 7106, +880 2 831 4765

Please RSVP: [email protected] or [email protected]

Agenda:

12 Noon- 1PM : Lunch

1 PM – 4 PM Seminar

Subject: Shipboard high voltage power

1. Shipboard electrical blackout recovery
2. Shipboard electrical redundancy, ship service and propulsion power
3. Shipboard electrical propulsion including azipod
4. HV and LV electrical grounding challenge and mitigation

Mohammed Monirul Islam, 4^th Batch Engg. Juldia Marine Academy, Chittagong, Bangladesh

Retired shipboard Electrical System Design Engineer.

Author of “ Handbook to IEEE Standard-45: Recommended practice for Shipboard Electrical Installations”

Retired Chairman of IEEE-45 Standard Development

Some highlights of the presentation

SHIPBOARD ALL ELELECTRICAL MEDIUM VOLTAGE POWER SYSTEM

SAFE AND SMART ELECTRICAL SYSTEM

FOR BANGLADESH SEMINAR DECEMBER 22, 2015

MOHAMMED M (MONI) ISLAM ELECTRICAL ENGINEERING DESIGN CONSULTANT

(Retired ) CHAIR-CENTRAL COORDINATING COMMITTEE FOR IEEE-45DOT STANDARD DEVELOPMENT

(Retired) CHAIR-IEEE-45.1 RECOMMENDED STANDARD FOR SHIPBOARD DETAIL DESIGN

[email protected]

504-333-5004

GROUNDING-SHIPBOARD SMART AND SAFE SYSTEM

TOPICS

1. FUNDAMENTALS OF SHIPBOARD GROUNDING
2. FUNDAMENTALS OF GS4-SHIPBOARD SMART AND SAFE GROUNDING SYSTEM
3. EXAMPLES OF CONVENTIONAL SHIPBOARD POWER LEVEL GROUNDING
4. CHALLENGES OF SHIPBOARD CONVENTIONAL GROUNDING OPTIONS OF MITIGATING CONVENTIONAL GROUNDING CHALLENGES
5. RECOMMENDATIONS FOR ADAPTING SHIPBOARD SMART AND SAFE GROUNDING AND MONITORING SYSTEM
6. ARC FLASH CHALLENGES-BETTER SYSTEM COORDINATION
7. ROLE OF IEEE-45 STANDARD DEVELOPING WORKING GROUP FOR GS4
8. ROLES OF -INDUSTRY, UNIVERSITY AND RESEARCH GROUP FOR GS4

GOAL– UNDERSTANDING OF SHIPBOARD GROUND DETECTION SYSTEM OF UNGROUNDED POWER GENERATION AND DISTRIBUTION

FUNDAMENTALS OF SHIPBOARD GROUNDING

*  SHIPBOARD POWER GENERATION AND DISTRIBUTION SYSTEM IS ISOLATED OR UNGROUNDED

*  CAPACITIVE SYSTEM GROUNDING

*  GROUND DETECTION SYSTEM HAS BEEN WITH LIGHTS AND TEST PUSHBUTTONS

* ADVENT OF MEDIUM VOLTAGE POWER GENERATION AND DISTRIBUTION BROUGHT ALONG RESISTANCE GROUNDING

*  THIS RESISTIVE GROUNDING AS WELL AS GROUND DETECTION LIGHTS CREATED CONFUSION DUE TO THE FACT THE RESISTANCE GROUNDING ALLOWS UP 5 AMPS (HRG) TO THE GROUND.

*  THIS RESISTIVE GROUNDING MAY COMPROMISE ELECTRICA SAFETY ONBOARD SHIP.

*  THEREFORE THE SAFETY AND RELIABILITY ISSUES MUST BE ADDRESSED PROPERLY

*  UNDERSTAND REGULATORY BODY REQUIREMENTS

• BY REGULATION ELECTRICAL POWER DISTRIBUTION SYSTEM MUST BE GROUNDED

• BY REGULATION SHIPBOARD POWER SYSTEM MUST NOT BE GROUNDED

• SHIPBOARD UNGROUNDED SYSTEM IS REALLY CAPACITIVE GROUNDED

• RECENTLY RESISTANCE GROUNDING SYSTEM HAS BECOME A NORM FOR SHIPBOARD POWER SYSTEM• EXPERT OPINION

“UNGROUNDED” SYSTEMS

REALLY ARE GROUNDED ON SHIPS

*  Ungrounded voltage systems are usually selected for “no- break” voltage systems, where power cannot be lost without endangering life or property

*  Ship power systems are usually ungrounded, with no

direct earthing connection

*  Such systems are actually grounded via cable capacitance, and may be resistance or impedance grounded to protect equipment.

*  Electronics equipment using line filters – common mode

capacitors add to system capacitance