Power Supply System

Our power supply system is composed by a standard medium voltage supply by national electricity vendor and by an emergency network with self-produced electricity in low or medium voltage. In normal conditions, it is possible to sustain the entire structure with self-produced energy only. Both networks are connected to a central switchboard that distributes energy in medium voltage for lighting system and FM, and manages many more switchboards and/or rooms. The central switchboard gives power to all devices in low voltage, following the criteria described above.

Electrical system structure
Our electrical system is designed with a modular structure, ready for future upgrades.
Its layout is based on the following criteria:
Redundant power flow rate and distribution devices, from supply starting point to final users, guaranteeing a constant stream of electrical power.
Flexible distribution in compliance with the previous point and with the technical layout of areas that need to be supplied
Ability to ensure automatic switching between defined sources in any point:
In “zero” time on device continuity line
In minimum time on all normal and preferential devices
(mechanical switching time between the two main motorized switches)
High capacity for maintainability, security and administration

Redundancy
Our electrical system has built-in redundancy for every component, in order to guarantee constant power supply.
The most relevant features are:

  • Medium voltage power supply with receiving switchboard, with double input for bypass between the two power sources at medium voltage level
  • Medium/Low voltage transformation cabin prepared with:
  • Medium voltage distribution switchboard, powering up two transformers
    • Two resin-made isolated medium/low voltage transformers, the spare one is activated by the other. This guarantees:
      • 100% device provision
      • 100% power provision
  • Two power distribution systems (line A and line B), each of them composed by:
    • Low voltage general switchboard changing network group by line, with possibility for mutual remote switching;
    • Power Center low voltage general switchboard with triple division for main distribution and powering of preferential loads;
  • Two continuity systems (line A and line B) placed in distinct areas, isolated and partitioned in departments, each of them containing:
    • Low voltage electric switchboard for power supply and distribution
    • Centralized array of uninterruptible power supplies (UPS) equipped with accumulators, able to guarantee an autonomy of 20 minutes at full load, working in parallel, with bypass possibility
  • Power transfer system composed by a pair of STS static switches for transfers, with the ability to switch loads between the two distribution lines (line A and line B) in “zero” time. Such solution ensures a doubled security line for end users.
  • Secondary power switchboards to supply lighting/motive force systems and technologic structures, created for automatic mechanical switching between two power sources (line A and line B)
  • Electric switchboards for device rooms to supply power to cabinets, one for each line (line A and line B); all switches on the board are equipped with contacts to report statuses/alarms to the central control system (BMS)
  • Self-produced power source protected by electrical generators and equipped with diesel fuel power supply system, able to produce energy when electricity network is down
  • 48V Power supply system for direct current devices, each line headed by modular converters, supported by spare converter modules
  • Main power lines connecting “Power Center” electric switchboards to the electrical generators, built with armored pipes and cables with low toxic and corrosive gas emissions, equipped with fire dampers
  • Electric lines supplying power to device rooms and secondary purposes are realized with special cables to avoid spreading of fire and to reduce toxic gas and matt smoke emissions. To conveniently install such cables, cable ducts are used for vertical parts and cable trays for horizontal ones
  • Double secondary distribution for devices, starting from their related switchboard room

 

 

Flexibility
All systems and devices we selected are designed with modular approach, therefore offering maximum flexibility together with the highest number of possible configuration options for each area of the structure. Devices are implemented proportionally to the amount of machines that gradually populate server rooms.

Maintainability and security

Maintainability and high security levels are guaranteed by the following features:

  • Possibility to deactivate specific parts of the structure for service purposes, guaranteeing in any case its functionality
  • Smoke detection system covering the whole structure; simultaneous alert coming from two or more detectors activates the automatic fire extinguishing procedures, in those areas covered by extinguishing system based on gas.
  • Floor-based anti-flood system in each server room, technical areas and offices.
  • BMS (Build Management System) dedicated to the detection of statuses, warnings, alerts and working conditions for all mechanical and electric systems, integrated with monitoring and control management systems.
  • Anti-intrusion system with dedicated sensors on each level of the building: systems area, floors, technical areas etc. Door-break detection system and access control with proximity badges. Closed circuit control cameras on external areas, on main internal accesses and device rooms.
  • ARGON gas-based fire extinguishing system in every device room, both inside the rooms and under the raised floor, with supply network for gas distribution. Moreover, a dedicated washing system is operating to eliminate gas from affected areas after its application.

Allocation of systems

Electrical systems are divided according to the following structure:

  • Transformer cabin for main power supply (medium voltage transformer)
  • Emergency power supply station (electrical generator)
  • Automatic power factor correction unit (available for medium voltage power supply)
  • Electric switchboards to control power distribution for lighting/FM systems
  • Grounding system
  • Power distribution for TLC devices at 220 Vac and 48 Vdc

Emergency power supply

Emergency power is granted by a system of electrical generators capable of supplying energy to the entire structure for a minimum period of 72 hours. In particular, three electrical generators, 800KVA/each, four UPS devices, 160KVA/each and 20.000 liters of diesel fuel, provide all the support needed for the structure to be completely independent.