Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

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Keywords

Y4system or software

Z4PowerF33

Electric Utility
TEPCO Power Grid, Inc.

Engineering Service: Distribution Automation System (DAS)
Features
Improvements to the power supply reliability and efficient operation of the distribution system, are achievedin order to maximize the capacity for accepting generated power and interconnectable capacities.
◆ Multi-divided multi-connected system, supporting effective power outage recovery and efficient system
operations◆ Online monitoring of system operation status with distribution automation system◆ Shortened power outage recovery time through rapid identification of power outage locations, using
automatic and remote controls
Overview or Principles[Multi-divided and multi-connected power systems]
Reducing the duration of power outages, wherever they occur in the world, is a major problem for society
overall, therefore power utilities constantly strive to improve power supply reliability. The planning of power
distribution systems is extremely important, since distribution systems are the closest to users in any powertransmission and distribution network and since a lot of the power outages are caused by power distribution
facilities.
A variety of systems are among power distribution systems, however the multi-divided and multi-connected(MDMC) system has been utilized by TEPCO Power Grid, Inc. The multi-divided and multi-connected
system, interconnects distribution lines, whereas distribution lines are distributed across multiple sectors,
providing a higher reliability than radial systems and are capable of a higher operating rate to power
distribution lines than loop systems. The multi-divided and multi-connected system is a superior power
distribution system configuration, but since the configuration is complicated, a high degree of load
management technology is required.

* In the case of three-division three-connection system[Distribution Automation System]
The distribution automation system is capable of performing a series of operations, including “automaticidentification of fault segment”, “automatic cutoff of fault segment”, “automatic recovery of healthy segment”,
entirely on its own when any fault
ry occurs in the power distribution system. The system configuration of amulti-divided and multi-connected system is essential to rapidly restore power to healthy segments(segments outside fault segments where problems have not occurred). Utilizing sophisticated facility forming
know-how, accumulated over many years, to build multi-divided and multi-connected systems, while
supporting efficient and rapid fault recovery and improving reliability with power distribution automation
systems, TEPCO Power Grid, Inc. is contributing to maximizing the capacity for receiving the power
generated by reusable energy.

Implementation effect of three-division, three-connection power distribution automation system (image)[Automatic switch with built-in sensors]
A power distribution automation system will become capable of remotely acquiring power system
information, such as voltage, current, power factors and the like, by combining the system with anautomatic switch with built-in sensors. The acquired information will be used to gain an understanding of
the voltage distribution and network congestion status in the power distribution system, thereby maximizing
the capacity to connect with sources of reusable energy.
Power distribution
automation system(master station)

Switch: Remote control
Switch: Status monitoring
System information acquisition

Circuit breaker/switch control

Data

Data transmission
equipmentPower
distribution
line A
Reclosingcircuit breakers

Substation A

Switch: Open/close status

Communication media (optical fiber, 3G, etc.)
Controller

Segment 1

Segment 2

Automatic switch

Segment 3
Segment 3’
Interconnection switch

Automatic switch with built-in sensors (VT, CT)

Segment 2’

Segment 1’

Automatic switch
Power distribution lines divided
into multiple segments

Powerdistribution
line B
Automatic switch
with built-in sensors

Substation B

Automatic switch with built-in sensors

Controller: Power distribution
automation system (slave station)

Operates (opens and closes) according to
instructions from the master station. System
information and switch status can also betransmitted to the master station.

Information on automatic switches with built-in
sensors transmitted to the master station.
Supports multiple communication media.

Energy saving effects & special notes
The following effects can be expected by achieving a reduction in power outage duration and operating
power distribution lines at high rates.
◆ Maximize capacity to receive reusable energy generated power (kWh)◆ Maximize capacity to interconnect with systems of reusable energy (kWh)Past or planned implementations
Domestic◆ Power distribution automation at TEPCO Power Grid, Inc. (from 1990 to the present time)Overseas◆ Power distribution facility planning system popularization promotion project in Vietnam(2016 to 2017)◆ Power distribution system, operating system and management technology popularization
promotion project in the Philippines (from 2017 to the present time)

Contact:

Overseas Business Office, Tokyo Electric Power Company Holdings, Inc.
URL：https://www.tepco.co.jp/en/hd/ourbusiness/consulting/index-e.html

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