DieselShip

 
Electrical equipment

General

The complete electrical plant on board ship is made up of power generation equipment, a distribution system and the many power utilising devices. Electricity is used for the motor drive of many auxiliaries and also for deck machinery, lighting, ventilation and air conditioning equipment. A constant supply of electricity is essential for safe ship and machinery operation, and therefore standby or additional capacity is necessary together with emergency...

VOLTAGE DIVIDERS
Voltage dividers for d.c., a.c. or impulse voltages consist of resistors or capacitors or convenient combinations of these elements. Inductors are in general not used for voltage dividers for testing purposes, although 'inductance voltage dividers' do exist and are used for the measurement of power frequency voltages,(139) independent from inductive voltage transformers as used in power transmission. Inductance voltage transformers consist in the simplest case of a...

DIELECTRIC REFRACTION
In the case when the electrical displacement vector D meets the interface between two media of different permittivities at an angle other than 90° ,the direction of this vector will change in the second dielectric. In general, it can be assumed that no free charges are present at the interface and only (dipolar) polarization charges define the boundary conditions. Then the angles of incidence and refraction are related as follows:
tanai _ Eq/Eni _ E^ _ Dni/si...

SURVEY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
SOLAS Regulations for Electrical EquipmentChapter II-1 Part D Deals with Electrical InstallationsRegulation 40 - General
Regulation 41 - Main source of electrical power and  lighting systems
Regulation 42 - Emergency source of power in passenger ships
Regulation 42 - 1 - Supplementary emergency lighting for ro-ro passenger ships
Regulation 43 - Emergency source of power in cargo ships
Regulation 44 - Starting arrangements for...

ELECTROSTATIC FIELDS AND FIELD STRESS CONTROL
In response to an increasing demand for electrical energy, operating trans­mission level voltages have increased considerably over the last decades. Designers are therefore forced to reduce the size and weight of electrical equipment in order to remain competitive. This, in turn, is possible only through a thorough understanding of the properties of insulating materials and knowledge of electric fields and methods of controlling electric...

REFRIG & AIR CONDITIONING
RefrigerationRefrigeration is the process required for safe storage of food or any other product to be transported, which necessitates that it is maintained at low temperatures.Whatever be the size of the process, it will have a cooling unit (evaporator), a refrigerant compressor and a condenser.The refrigerant used is generally Freon-12 or Freon-22 but ammonia is also used in large systems.
Basic refrigerant circuit of A direct...