Power Distribution in DB6

DB6 is a Data Center built and owned by Equinex, a client of XYZ Reality. This section is intended to provide the readers with a high-level overview on Data Centres power distribution within the fit-out area, while this document is specific to DB6X, it may share the same concepts with other data centres hence always refer to project specific documents.

Overview

A Data Centre is an infrastructure that houses large quantities servers in the data halls. These servers require reliable power in order to function as required by the end users.

On DB6 there is 4 data halls with a combined IT load of 9.6MW which is supported by:

(Refer to Figure 1 below)

● 4 no E-Wall - Zone (A, B, D, E)

● 1 no Mech Block – Zone F – Me-Wall – Powers the Critical Mechanical plants

● 1 no R-block – Zone C – Reserve Power – Provides backup power for the Critical Mechanical plants/ Data Hall in case there is a power failure in a specific wall.

E-Walls - Zone (A, B, D, E)

Each E-Wall on this project is responsible to power the servers in its assigned data halls.

• Zone A – Data Hall 9
• Zone B - Data Hall 11
• Zone D - Data Hall 12
• Zone E - Data Hall 10

Me-Wall – Zone F

The Me-Wall is responsible for powering the critical mechanical plants such as cooling towers, AHUs, packaged pump room, fire alarm and Fan walls in the data halls.

R-block – Zone C

The R-block provides backup power to the critical mechanical plants listed above and to the eWall.

What makes up an E-Wall, Me-Wall & R-block?

The E-Wall on DB6X is made up from the configuration below:

1. Transformer Room
2. Battery Room
3. Uninterruptible power supply (UPS) Room
4. Static Transfer Switch (STS) Room

The Me-Wall & R-block on DB6X is made up from the configuration below:

1. Transformer Room
2. Battery Room
3. Uninterruptible power supply (UPS) Room

Transformer Room

● Converts power from higher voltage to lower voltage.

Battery Room

● Stores the batteries for the E-Wall/R-block/Me-Wall load.

Uninterruptible power supply (UPS) Room

● Converts DC (direct current) power to AC (alternating current) power, taking the battery power and converting it AC and provides short term back up power while waiting for the generator to power up.

Contains MCE listed below:

1. Input Switchboard (MSB) - Busbar connection from TX, Busbar Connection to Output Switchboards and UPSs.
2. Output Switchboard- Busbar Connection to Customer Feeder Static Transfer Switch (STS) plants and Customer Feeder Static Transfer Switch in STS room.
3. UPS- Batteries – Busbar connection from MSB to Output Switchboard
4. Customer Feeder Static Transfer Switch (STS) - Busbar connection from MSB, cabling out to loads.

Static Transfer Switch (STS) Room

● This serves as a back up to eWall it is assigned to. In case of a failure of power distribution from the UPS room to the load, the load is then served from the STS room which is backed up by the R-block busbar loop.

Data Hall Power Distribution

Power Distribution to servers

As mentioned above, each zone serves a data hall independently and is backed by the R-block. Now we will look at the power distribution to a data hall, in this case we will take Data Hall 9 which is served by Zone A. Refer to Figure 1 mentioned earlier.

1) Power from the Customer Feeder Static Transfer Switch (STS) in the STS room which is backed up by the R-block busbar loop. LV cable feeds into the busbar end feed unit (3).

2) Power from the Customer Feeder Static Transfer Switch (STS) in the UPS room. LV cable feeds into the busbar end feed unit (3)

3) Busbar end feed unit (Busbar Tap Off Box) which receives power from LV cables and runs along the serves area as busbar tray.

4) Busbar end feed unit (Busbar Tap Off Box) which feeds power from the busbar tray to the servers. These servers usually come with a plug which is premade and plugs into the busbar tap off box to be operational.

Power Distribution to Cooling Array XScale (Fan Banks/ Fan Walls)

Cooling plants are critical to the operation of data centres. Hence these critical mechanical plants such as cooling towers, AHUs, packaged pump room, fire alarm and Fan walls in the data halls are fed from the power from the Me-Wall and have the R-block as a back-up power source. Figure 2 below shows that for the fan bank 1 in the data hall 1 are fed by both the Me-Wall and R-block creating redundancy.

The snapshot above from the BIM shows the busbar end feed units which will be fed by the Me-Wall power via LV cables and this busbar runs along the entire length of the Mechanical Corridor. The fan walls then received the power from Miniature circuit breakers (MCB) via cables.