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  1. [11]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
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    Standards Actively Used Design and Inspection

    The document is NFPA 780 , it cover the instalation of Lightning systembelow is some information about all the lightning standard used around the world


    Standards Actively Used Design and Inspection

    NFPA 780
    UL 96A
    UFC 3-570-01
    AFMAN 91-201
    NAVSEA OP-5, Vol. 1
    DA Pamphlet 385-64
    First Three Used for Ordinary Buildings
    Last Three Referenced for Ordnance / Explosive Facilities.

    NFPA 780
    Base Document Used by UFC 3-570-01 & UL96A
    UL96A Designed to Meet All the Min Requirements
    UFC 3-570-01 Provides Guidance for Areas Not Covered in
    NFPA 780.

    UL96A
    Intended As an Inspection Standard
    Defined Requirements
    Less Interpretations.


    UFC 3-570-01
    Unified Basic Requirements Between Service Branches
    Expansion of Requirements for Special Types of Structures
    Guideline Requirements for Ordnance / Explosive Facilities.


    UFC 3-570-01 & NFPA 780
    Section 5-3 refers to NFPA 780 Appendix H for risk assessment
    to identify structures not needing coverage.
    5-4.1 Capped air terminals are not permitted.
    5-4.1.2 Air Terminals gives specific distances for exhausting
    hazardous vapors
    Air terminals installed on “rubber” (EPDM) type roofs.

    UFC 3-570-01 & NFPA 780
    5-4.1.3 Conductors.
    _ Bolted Connections Are Not Allowed on the Roof and Down
    Conductors.
    _ Roof and Down Conductors Shall Be Exothermically Welded or
    Shall Use High Compression Fittings
    There Are No Listed High Compression Fittings Listed by UL for
    This Application.
    5-4.2 Mast System.
    _ The down conductors need to be protected from grade level to a
    point 3 m (10ft) above grade.

    UFC 3-570-01 & NFPA 780
    5-4.2.7 Joint Design.
    _ Not covered in NFPA 780
    5-4.2.8 Joint Test.
    _ Not covered in NFPA 780
    5-4.4 Faraday Shield System.
    _ Not covered in NFPA 780
    5-5 NONCONVENTIONAL SYSTEMS.
    _ Dissipation Arrays and Those Using Early Streamer Emission Air
    Terminals Are Not Acceptable and Are Not Be Used.

    UFC 3-570-01 & NFPA 780
    5-6.2 Bonding Installation Guidelines For Design And
    Construction.
    Basic Requirements for Bonding of LPS Are in AFI 32-1065 and
    NFPA 780.
    5-7.1 Ground Resistance.
    _ Not Covered in NFPA 780 With a Specific Value but Techniques.
    5-7.2
    _ Plate Electrodes Is Discouraged.

    UFC 3-570-01 & NFPA 780

    5-10.2 Reinforced Concrete Buildings.
    _ Reinforcement Steel May Be Used for Down Conductors, in
    Conformance With NFPA 780. This Is Not Allowed in NFPA 780
    5-10.3 Steel Frame Building With Non-conducting Roof and
    Sides.
    _ At Least One Steel Column Must Be Grounded at Each Corner of
    the Building.
    5-10.4 Through 5-10.6
    _ Installation Techniques Not Covered in NFPA 780.
    UFC 3-570-01 & NFPA 780
    5-10.9 Post Tensioning Systems.
    _ The Post Tension Rods Shall Not Be Used As a Path for Lightning
    to Ground.
    5-10.10 Through 5-10.20
    _ These Cover Special Types of Ordinary Structures

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    الصور المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  2. [12]
    نوران الوائلي
    نوران الوائلي غير متواجد حالياً
    تم إيقافه لمخالفة القوانين


    تاريخ التسجيل: Dec 2009
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    مشكوووووووووووووووووووووور

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  3. [13]
    إبن جبير
    إبن جبير غير متواجد حالياً
    عضو متميز جداً
    الصورة الرمزية إبن جبير


    تاريخ التسجيل: Apr 2009
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    Thanks we need more detail please

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    ]كُلُّ نَفْسٍ ذَآئِقَةُ الْمَوْتِ وَإِنَّمَا تُوَفَّوْنَ أُجُورَكُمْ يَوْمَ الْقِيَـٰمَةِ فَمَنْ زُحْزِحَ عَنِ النَّارِ وَأُدْخِلَ الْجَنَّةَ فَقَدْ فَازَ وَمَا الحْيۈةُ الْدُّنْيَا إِلاّ مَتٰـٰعُ الغُرُورِ[.(185)-آل عمران

  4. [14]
    dooa
    dooa غير متواجد حالياً
    جديد


    تاريخ التسجيل: Jan 2009
    المشاركات: 3
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    السلام عليكم ورحمه الله وبركاته
    مطلوب مخططات تصميم لجميع الاعمال الكهربائيه
    ومطلوب حمل برج دبى ومحطه الكهربائيه
    ومطلوب وصف لجميع الانظمه واماكن وضع المحولات هل هى موزعه داخل البرج ام هى مجمعه فى مكان ثابت ويتم توزيع الكهرباء عن طريق باص بار
    لتكون بمثابه دراسه لمثل هذة المشاريع
    ولكم جزيل الشكر

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  5. [15]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
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    Burj Dubai Electrical System

    The power needs for Burj Dubai are the equivalent of what would be needed for a small town. The tower’s peak demand is estimated to be 36-mega volt ampere (MVA). That level of electricity could power approximately 4,000 households. During peak cooling periods, the Burj Dubai will require enough power to cool the equal vent of 10,000 tons of ice in one day.


    Burj Dubai will have its own electrical substations. The voltage of the electricity will be lowered to a level that is considered safe for consumers. The system relies on switchgears, which can switch and interrupt devices so that the electrical equipment can be repaired or maintained. Distribution transformers will also be used to help regulate the electrical supply to the residences.
    DSE Engineer did the interior electrical design for the Burj Dubai and lighting systems were made by Futronix. It is the largest lighting control system that has ever been manufactured. The exterior lighting system is equipped with a wide array of lights the change color every
    half hour. 150 DMX luminaries are used for the exterior lighting

    .With over 160 levels to provide with power and a connected load of 74.15MW and MD of 44.32MW, the installed electrical distribution system for the Burj Dubai is somewhat unusual for a mixed-use building.

    High voltage operations

    The building is served by a total of twenty 11kV feeders from the Dubai Electricity and Water Authority (DEWA) network. It is also connected to a DEWA 132/11kV substation that is located within the Burj Dubai Development.

    Rather than step-down transformers reducing the voltage at the high voltage (hv) incoming supply, here an 11kV power supply is distributed throughout the building via two main risers.

    Two separate risers located in the building core serve the full height of the building and operate in parallel to ensure security of supply.

    Supplies within the risers provide normal operating power and emergency generating power separately, with emergency generators serving the life safety systems, elevators and general escape lighting.

    Five 2200kVA generators provide back-up to the life safety systems in the event of a power failure. Under total or partial power failure the generators will operate via automatic transfer switches (ATS). Battery-operated emergency lighting will also operate within the tower in the event of a mains failure.

    The 11kV distribution within the risers has been completed using a four-core, 180mm2 diameter cable. This decision was made as 11kV busbars are more suitable for use in short runs within substations; the flexibilitiy of tap-off points provided by busbar was also not necessary in the building.

    Low smoke and fume (LSF) cables have been specified throughout the project in order to reduce the risk of fume pollution in the event of a fire.

    The hv distribution serves hv substations within the main MEP floors of the tower at levels 17, 40, 73, 109, 136 and 155. At these points the supply is reduced to 400V and distributed locally by busbar via sub-mains distribution boards. These eventually feed local distribution boards via corridor routes.

    BURJ DUBAI: THE FIGURES

    • 121,000 light fittings;
    • 170 pumps;
    • 34km chilled water pipework;
    • 4,000 fan coil units;
    • 140 air handling units;
    • 3,600 fans;
    • 52 heat exchangers;
    • 225,000 chilled water pipe fittings;
    • 33,000 chilled water valves;
    • 74.15MW electrical load;
    • 1.8 million metres of conduit; ;
    • 250km lv cables;
    • 1.5 km of busbar;
    • 20km of mv cables;
    • 5,000 facade lights;
    • 375km fire alarm cabling;
    • 10,000TR cooling load..
    55Km of cable tray
    71 Electrical Transformer
    • 20km of mv cables

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    الصور المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  6. [16]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
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    Electrical System details - burj Dubai

    ELECTRIC SYSTEMS
    Burj Dubai as one of the first super-tall buildings in Dubai and was also one of the first projects to distribute 11 kV voltage. The provided 11 kV services enter via underground concrete encased ductbanks into the building by the Dubai Electricity and Water Authority (DEWA). Multiple 11 kV risers will provide power to the transformers to produce 400y/230V power. Due to the extreme heat and humidity, the transformer rooms are air conditioned and have ventilation fans as back-up in case of emergencies.

    The peak demand is 50 MVA Demand. It was also necessary to derate the cabeling because of the extreme heat the system could encounter during summer power failure condition.
    The emergency standby power generation system is diesel fueled engine generator set, complete with automatic synchronizing equipment and controls for starting on loss of normal power and for load transfer. Local and remote manual controls are provided for starting of the power generation set. Five (5) 11 kV emergency generators; One (1) at 400 V emergency generator will provide power to the fire, life safety and critical systems. The emergency standby power generation system is sized for the loads including emergency lighting, fire pumps, selected elevators, Stairway pressurization, Smoke purge fans, pumps intended to overcome gravity (i.e., sump and sewage ejector pumps), fire alarms and life safety, Security, Telephone equipment, aircraft warning lights and miscellaneous critical loads (e.g., power generation auxiliary equipment, kitchen freezers, etc.). A central battery system with capacity for three hour operation will provide continuous power for egress lighting.
    Given the height of the building and the environment, it is likely that lightning will strike the building during its life time. The lightning protection system acts as a Faraday Cage by using the building structural rebar as down conductors. Copper Conductor tape locate on parapet and conductor loop in slab at each set back and mechanical floor connected to the rebar. The entire system is connected to the ground conductor inside the building foundation piles. Copper is initially selected as the ground conductor. Subsequent field study indicated the corrosive nature of the soil will erode copper in the ground. Stainless Steel was instead selected as the final ground conductor.

    The grounding system has multiple dedicated ground conductor risers for normal power system, communication system and emergency power systems. The risers are connected to the counterpoise loop in the podium and finally connected to the ground conductors

    .
    • Upper HV/LV substation: Located on the 155/156 floors at well over 500m above ground, making this the highest substation anywhere in the world;
    • Burj Dubai’s connected load: In excess of 79MW, with a maximum demand of 46MW, provided via 20 separate 11kV supply cables, making this the most complex HV service to a single building in the world;
    • Hydraulic systems: Burj Dubai operates on a three lift principle, with water pressures peaking at 35 bar. Such pressures are normally only associated with process/industrial design, and not MEP design of buildings. The building’s hydraulic systems are totally unique;
    • Lift design: There are many unusual aspects of the lift design, but one particularly different feature is that, in the event of transformer failure in any of the building’s many substations, a new one can be lifted into position easily and quickly without special arrangements.


    0 Not allowed!


    الصور المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  7. [17]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    Borj dubai lightning pictures

    file attached

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    الملفات المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  8. [18]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
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    lightning Protection

    attached is three file on lighting protection ,

    NFPA 780 standard will be posted soon

    0 Not allowed!


    الملفات المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  9. [19]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    NFPA 780 Standard for lightning installation

    NFPA 780 Standard for lightning installation
    Hope it will help you with the design of lightning system

    0 Not allowed!


    الملفات المرفقة
    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  10. [20]
    ricielectric
    ricielectric غير متواجد حالياً
    عضو متميز
    الصورة الرمزية ricielectric


    تاريخ التسجيل: Nov 2009
    المشاركات: 684
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    أرجو التقييم

    0 Not allowed!


    Knowledge Is Power


    المواضيع منقولة فالرجاء الدعاء لكل من ساهم فى وصول المواضيع اليكم ولا أسألكم سوى الدعاء.

    بالعلم نتقدم...

  
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