bvn tm elec1 – electrical equipment head office – department technology equipment - v0 –...

BVNTM ELEC1 – ELECTRICAL EQUIPMENT

Head Office – Department Technology Equipment - V0 – December 2009

CONTENT

1 – Objectives2 – Electrical equipment general requirements3 – Various electrical equipment

3Bureau Veritas S.A. internal use only – BVN TM ELEC1 – V0 – December 2009

Electrical equipment – Objectives

THIS MODULE IS MAINLY BASED ON

HO DTM/DT3 TRAINING REFERENCED SMS64

1 – Objectives


Electrical equipment – Objectives

• To be familiar with Classification Rules regarding electrical equipment

• Study of Classification Rules requirements for electrical equipment

2 – Electrical equipment general requirements


Electrical equipment

► General

The class rules are related to essential services

All services which are not essential are not considered by the rules as far as they do not interfer with essential services

Definition of the essential services is issued from IACS interpretation SC 134

Essential services are those services to be supplied by the main source and considered on the electrical load balance as necessary power for minimum sizing of generators



► Definition of services

Primary essential services are those which need to be maintained in continuous operation

Secondary essential services are those services which need not necessarily to be in continuous operation



► Primary essential services

Steering gear

Actuating systems of controllable pitch propellers

Scavenging air blowers, fuel oil supply pumps, fuel valve cooling pumps, lubricating oil pumps and cooling water pumps for main and auxiliary engines and turbines necessary for the propulsion

Forced draught fans, feed water pumps, water circulating pumps, condensate pumps, oil burning installations, for steam plants or steam turbines ship, and also for auxiliary boilers on ship where steam is used for equipment supplying primary essential services

Azimuth thrusters which are the sole means for propulsion/steering with lubricating oil pumps, cooling water pumps

Electrical equipment for electric propulsion plant with lubricating oil pumps and cooling water pumps



► Primary essential services

Electric generators and associated power sources supplying the above equipment

Hydraulic pumps supplying the above equipment

Viscosity control equipment for heavy fuel oil

Control, monitoring and safety devices/systems for equipment for primary essential services

Speed regulators dependent on electrical energy for main or auxiliary engines necessary for propulsion

Starting equipment of diesel engines and gas turbines.

The main lighting system for those parts of the ship normally accessible to and used by personnel and passengers is also considered (included as) a primary essential service.



► Secondary essential services

Windlasses

Thrusters

Fuel oil transfer pumps, fuel oil treatment equipment, and preheaters for heavy fuel oil

Lubrication oil transfer pumps and lubrication oil treatment equipment

Sea water pumps

Starting air and control air compressors

Bilge, ballast and heeling pumps

Fire pumps and other fire-extinguishing medium pumps

Ventilation fans for engine and boiler rooms

Services considered necessary to maintain dangerous cargo in a safe condition



► Secondary essential services

Navigation lights, aids and signals

Internal safety communication equipment

Fire detection and alarm systems

Electrical equipment for watertight closing appliances

Electric generators and associated power supplying the above equipment

Hydraulic pumps supplying the above equipment

Control, monitoring and safety for cargo containment systems

Control, monitoring and safety devices/systems for equipment for secondary essential services



► General requirements for essential services :

The connection of generating sets and associated auxiliaries and other duplicated equipment is to be equally divided between the parts as far as practicable, so that in the event of damage to one section of the switchboard the remaining parts are still supplied

Auxiliaries G3 & G4

G4 G3 G2 G1

Auxiliaries G1 & G2



► General requirements for essential services :

Distribution system to be such that the failure of any single circuit will not endanger or impair primary essential services and will not render secondary essential services inoperative for longer periods.

No common switchgear for two primary non duplicated essential services.

Protection of circuits is to be such that the fault in one circuit does not cause the loss of any essential services (Selectivity so as to obtain continuity of supply + design)

Fire pump 1

Fire pump 2

Not acceptable if there are only 2 pumps !!



► Environmental conditions

The electrical components of installations are to be designed and constructed to operate satisfactorily in the environmental conditions on board.

It doesn’t mean that BV ask to test all the electrical components



► Environmental conditions

Temperature (refer to UR E19 from IACS for electrical equipment installed in environmentally controlled spaces) :

Humidity : General - 95% at 55°C. Air Conditioned Areas – Different values may be considered

Salt mist : 1 mg/m3 of air

Sea water temperature : General 0°C to +32°C. For ships classed for service in specific zones different values may be accepted

Inclination

Vibration

EMC – Levels to be assumed are those given Pt C, Ch 3, Sec 6 or IEC 60533



► Quality of power supply

AC

DC

Harmonic distortions

• 3 % Single harmonic

• 5% THD



► Material

Flame retardant

Moisture resistant

Insulation class for windings

Construction

• Appropriate to the environmental condition

• IP xy (Index of Protection : x = foreign bodies / dust, y = water) Minimum required IP is to be in accordance with Ch 2, Sec 3, Tab 2

• Ex protection for equipment installed in hazardous areas (LG Carriers, Chemical Tankers, etc…)



► Environmental conditions - (EMC)

Solas V Regulation 17 defines requirements concerning the ElectroMagnetic Compatibility of electrical and electronic equipment installed on the bridge or in the vicinity of the bridge. It refers to the recommendations developed by the organization: Resolution A813(19).

This electrical and electronic equipment need be tested for conducted and radiated emission only.

A813(19), dated 23/11/1995, refers to IEC 60533 and IEC 60945.

• IEC 60945 : Maritime navigation and radio-communication equipment and systems - General requirements - Methods of testing and required test results.

• IEC 60533 : Electrical and electronic installations in ships - Electromagnetic compatibility.

A813(19) refers to A694(17), dated 06/11/1991. A694(17) asks to take “all reasonable and practicable steps to ensure compatibility between the equipment concerned and other radio-communication and navigational equipment carried out on board.



► Protection against explosive hazard

Electrical components are not to be installed in hazardous zones

Design of components in hazardous zones to be in line with IEC 60079

Several kind of design are available which are adapted to the hazardous zone

Installation of components in hazardous zones to be in accordance with BV rules (in line with IBC or IGC code)

Tables located in Part D are defining, according to the location, the acceptable electrical equipment for the zone (Ex component)

Label plates of the Ex components clearly indicate for which gas and temperature the component is appropriate

Each Ex component is supplied with a certificate delivered by a competent body, recognised by national authorities



► List of components to be BV type approved (Pt C, Ch 2, Sec 15):


• Rotating machines(motors, generators), converters, transformers

• Cables

• Switching devices

Automation equipment

• Automation components ( sensors, alarm systems, remote control systems, )

• Computer based systems

► Case by case approval

There is always a possibility to accept a component on the case by case basis, provided evidence is supplied for this purpose (BV Type Approval scheme)



INDEX OF PROTECTION IP



► IP rating - Definition

The I.P. rating system provides a means of classifying the degree of protection of an item from dust and water afforded by electrical equipment and enclosures.

The system is recognized in most countries and is set out in a number of standards including IEC 60529.

The format for the I.P. rating is indicated by two digits:

• The first numeral indicates

• The protection of persons (human body) against access to dangerous parts. Depending of the voltage, an adequate clearance is to be kept between the access probe and dangerous parts (LV: no touch – HV: withstand dielectric test).

• The protection of equipment against the ingress of solid foreign objects.

• The second numeral indicates protection of internal equipment against harmful ingress of water.



► The different standards

Other international standards exist.

The cross references are approximative !

IEC/EN 60529 defines the IP rating system, most European countries

NEMA (National Electric Manufacture ’s Association) North America

UL Underwriters Laboratories Inc. , North America

CSA Canadian Standard Association , North America

MIL-STD 810 Military standards North America

JIS Class 0 to 8 Japanese Industry Standard Japan


• Classification Rules requirements to be studied


3 – Various electrical equipment


Various electrical equipment

TYPICAL PRODUCT DESCRIPTION

AND

REFERENCE OF REQUIREMENTS FOR STUDY

3.1 – Various electrical equipment - Cables


Various electrical equipment - Cables

► Instrumentation Cables – 250 V

► Power and Control Cables – 1 & 3 kV



VARIOUS TYPES OF CABLES



► MV/HV Power Cables – 6 to up 30 kV



► Insulating compound

Temperature classes are based on IEC 60092-351(insulating materials)



Test for vertical flame propagation for a single insulated wire or cable (Requested by BV Rules: Cables have to be at least of the flame retardant type)



Flame Propagation Test on Bunched Cables

IEC 60332-3-22 Category A (7 l / m ; 40 min)Category B and C not accepted CEI 20-22/3

IEC 60332-3 - CEI 20-22/3This test evaluates the flame propagation of a bunch of cables each 3,5 m long. The number of test pieces should be in accordance with one of the three categories in order to provide the required total volume of non-metallic material per meter of mounted cables. The cables are mounted on a rung ladder in a metal cabinet and are subjected to burning by a ribbon flame at 750°C for a specified time.The cables must not burn for more than 2,5 m.



A sample of cables is submitted under voltage rate in contact with a horizontal flame. The duration of test and flame temperature are stated by standards. During test (and after this in case of IEC 60331 and CEI 20-36), cable must continue to operate; no break or short circuit should occur in the cable.

Overall Diameter <= 20 mm: IEC 60331-21 750°C without shock

Overall Diameter > 20 mm : IEC 60331-1* 830°C with shock

* Cancels and Replaces IEC 60331-31 since May 2009



IEC 60754-1: Amount of HCL ≤ 0.5% or 5 mg/gIEC 60754-2: pH ≥ 4.3 and Conductivity ≤ 10 µS/mm



Smoke CorrosivityDegree of acidity of gases:IEC 60754-1/2



CABLES FIRE BEHAVIOR

LT ≥ 60% according to IEC 60092 series


Type approval

Various electrical equipment – Cables Part C Ch 2 Sec 9


Production phase – Cable individual certificate

Survey and routine testing



• Classification Rules requirements to be studied


bvn tm elec1 – electrical equipment head office – department technology equipment - v0 –...

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