The power system at Sago's Tampa facility is designed from the ground up to ensure continuous power availability for every mission critical system in our Data Center. Designed at an incredible capacity of 900 watts per square foot, our system includes better than N+2 redundancy at every failure point. Fed by 13,200 VAC, our system features 480, 277, 208, 120, and 115 VAC availability anyplace in the Data Center. Additionally, our separate DC Power Plant allows us to provide power to carriers, Internet backbones, and other DC users on an equally reliable system.

Utility Feed

Provided by Tampa Electric Co., our primary feeds consist of:

• 4,000 amps @ 13,200 VAC
• 4,000 amps @ 13,200 VAC (redundant)
• 4,000 amps @ 480 VAC (house feed)

Distribution Switch Gear

Our primary AC Power Plant is fed by state-of-the-art Cutler Hammer Molded Case Breakers and Square D enclosures. Each of the distribution breakers, which weigh approximately 300lbs each, is monitored via SNMP. Through this system, our NOC personnel are continuously aware of items such as phase shifts, harmonics problems, heat and more. The distribution switch gear features a failsafe Manual Transfer Switch, also controllable via SNMP by our NOC personnel, which allows us to manually switch over to generator power or make a critical bypass of our UPS systems all together in the event of a catastrophic failure of all redundant systems.

The HVAC system is also fed off directly from our distribution switch gear. This ensures that during a prolonged power failure, for example a massive weeklong black-out, we are able to keep our HVAC systems running by-passed and directly off generator power, thereby reducing the load on the UPS clusters and ensuring that everything stays on for the duration of the outage.

AC Power Plant

The "crown jewel" of our power system is our new AC Power Plant. Five Separate 800 kVA MGE EPS 6000 Series UPS Systems run in an independent 3+2 redundancy configuration. While this is by far the most expensive route in ensuring continuously availability, it is also the most reliable. Each of the three primary UPS systems outputs, through a massive 2,000 amp static transfer switch and critical bypass system, power to our end-user distribution system. Each of the 2,000 amp static transfer switches is, in turn, connected to "UPS Module Redundant #1". In the event of the failure of any of the primary UPSs, UPS Module Redundant #1 can seamlessly, without any interruption of power, begin supplying power to the end-user distribution system. Each of the MGE UPS systems is controllable via SNMP over a network connection and will proactively report any irregularity in operations. The devices are so sensitive that they will report the power and harmonics variation associated with powering up a full rack of servers at the same time. Other features of the EPS 6000 include:

• Fault tolerant circuitry allowing the UPS to sustain dead shorts with no risk of damage to the inverter. This is a vital feature in today's data center environments where daily wiring changes on the critical bus can fault the output and cause severe damage to most other UPSs.
• Precise voltage regulation limits voltage transients to under 5% when exposed to 100% step loads caused for high inrush currents associated with today's IT equipment (such as dedicated servers).
• Unique generator friendly technology drastically limits the requirement for over sizing generators and eliminates the risk of generator failure.
• Less than 4% THD on the output ensures critical loads only see a distortion free sine wave under all conditions.
• Advanced browser based power monitoring system option for easy and reliable monitoring.

End-User Distribution System

Each customer circuit is connected to an MGE 165kVA Power Management Module and Power Distribution Unit (PMM/PDU). At full capacity, we can support 24 PMM/PDU cabinets. MGE's PMM/PDU integrates isolation, conditioning, electronic grade grounding and distribution for up to 252 output breakers in a single system. Designed specifically to handle the high current distortion associated with electronic equipment, the PMM/PDU features a computer grade high K-Factor isolation transformer and 200% rated neutral bus. This allows the PMM to resist thermal stresses that compromise conventional transformers and distribution systems for unsurpassed reliability. Each of the PMM/PDU's contain a 2-source static transfer switch that feeds each AC input source into dedicated isolation transformers upstream of an Epsilon Static Transfer Switch. Dedicated transformers allow all components to be maintained without interrupting power to the critical load, maximizing reliability, availability and maintainability. As such, in the event of a failure of the primary UPS connected to that PMM/PDU, the PMM/PDU makes a static transfer to "UPS Module Redundant #2". Like all other systems in our power system, the PMM/PDUs are all manageable by SNMP, allowing us to tell a co-location customer the exact utilization in amps of kilowatt hours directly from an Internet enabled workstation in the NOC.

Battery Backup System

Battery backup for our MGE UPS system includes 1,250 gel cell Yuasa DDS series batteries, which are configured in five independentstrings each running in series at 600 volts each. Each legacy UPS also connects to two independent dry cell battery strings.

Generators

With paralleling gear supporting up to nine separate generators, we currently use two Caterpillar 1,500kw engines running as N+1. Two more GENERAC 2,000kw Mitsubishi Engines are being designed for installation Q2 2004. Each generator has its own belly storage tank and features manually cross pumps for redistributing fuel. We also have a secondary underground fuel reserve for use by any generator. Total storage is currently 15,000 gallons. Our ATS system is a dual feed GE Zenith and ASCO trans fer system. One supports the UPS segment, while the other supplies house power.

Onsite Emergency Provisions

We maintain a full onsite stockroom that consists of:

• A complete MGE 800kVA UPS, in parts
• A complete Liebert 450kVA UPS, in parts
• One each of each Cutler Hammer breaker deployed in our facility.
• One each of each switch column deployed in our facility.
• One each of each buss bar segment deployed in our facility.
• 20 each of each distribution breaker deployed in our facility.
• 2 each of each HVAC distribution panel deployed in our facility.
• 10 each of the YUASA gel cell batteries.

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