Electrical System Design

Total coordination capabilities cultivated under an electric power company

As a member of the Tokyo Electric Power Company (TEPCO) group, we are involved in the design of electrical facilities for special buildings such as electric power facilities and general buildings. We are also involved in the introduction of solar power generation, charging facilities for Electric Vehicles (EV), and other related projects. Our objective is to propose electrical facility plans that meet the specific needs of our clients and are tailored to the characteristics of their buildings.

Carbon neutral and disaster-responsive electrical system planning

We propose disaster-resistant facilities while aiming for carbon neutrality by introducing the following technologies.

Aiming for carbon neutrality

To achieve carbon neutrality, we will convert to ZEB by making maximum use of renewable energy and thoroughly conserving energy.

●Installation of solar power and storage batteries
In addition to the installation of photovoltaic power generation for ZEB, we will consider installing storage batteries. This will ensure stable use of unstable power, mitigate losses when output is curtailed, and provide power in times of disaster.

●Introduction of ultra-high efficiency transformers
We select transformers that are not only highly efficient, but also appropriately sized for the facility’s needs and operating conditions.*
*Normal business hours for offices, etc. and continuous 24-hour operation for data centers and factories

● LED lighting and lighting control (control based on daylight, motion, image sensors, etc.)
In addition to introducing highly efficient fixtures, we can achieve lighting only where and when necessary without compromising the comfortable viewing environment by using automated controls.

● Introduction of charging facilities for EV vehicles and V2B (Vehicle-to-Building)
The Japanese government has set a goal of achieving 100% EVs in new passenger cars by 2035 as part of its efforts to become carbon neutral. While conventional EV charging facilities are one-way systems that supply power from buildings to EV storage batteries, Vehicle-to-Building (V2B) technology allows for mutual power supply between EV vehicles and buildings.
V2B technology makes it possible to reduce contracted electricity consumption and lower electricity rates through “peak cut operation,” in which electricity is supplied from the storage batteries of EVs during peak electricity consumption periods in buildings. Furthermore, if equipped with a power conditioner that converts DC electricity to AC, it will also be possible to supply power to buildings and condominiums in the event of a disaster.

Disaster-resistant facilities

Multiplex power supply
●Selecting a power receiving method according to the size and importance of the building.
Electricity companies provide several types* of receiving methods.があります。
*Types of power receiving systems: Backup line system, loop power, 2-4 line spot network
The backup line system employs two lines that can be switched in case of failure, effectively preventing power outages.
The loop power receiving system, on the other hand, connects lines to other customers to create a ring structure, providing power from two directions (two-line power receiving), ensuring constant power supply.
Additional methods include using three or more lines, with the optimal system selected based on building facility and importance level, all aimed at minimizing power outage risks.
Other methods employed to ensure uninterrupted power supply in the event of a disaster include:

・Installation of emergency generators
・Installation of storage batteries

Power supply systems for high-quality data centers

Electrical facility planning for data centers must prioritize both environmental sustainability and high reliability to ensure uninterrupted power supply, even during disasters.

Redundant power supply system

Redundancy is a crucial factor in assessing the reliability of a data center.
These facilities operate around the clock, making it essential to have a redundant power supply system in case of outages, equipment failures, or shutdowns for maintenance.
To achieve this, we install spare units and redundant wiring between devices. However, excessive redundancy can increase costs, so we consider appropriate levels that match the facility's importance and grade.

【Examples of redundancy configurations】
　N permanent units + 1 spare unit (N+1 redundancy configuration)
　N permanent units + 2 spare units (N+2 redundancy configuration)
　N permanent units + N spare units (2N redundancy configuration)

Introduction of high-efficiency equipment

The power consumption of a data center is enormous, but we prioritize energy conservation measures to reduce operational costs.
To achieve this, we carefully select highly efficient equipment for transformers, uninterruptible power supplies, and other essential components of the power system.