Project Subjects
Strategic Disaster Restoration Support Technology for ElectricPower Distribution and Substation Equipment
Background and Objective
In order to effectively support the restoration activities for disaster damaged electric power distribution and substation equipment, their risk assessment and management technologies against disasters, which take
into consideration the reliability and accuracy of obtained disaster information during the emergency restoration
period, disaster force (hazard), and the diversity of the region and equipment, are requested.
The objective of this project is to develop a disaster restoration support system for their equipment against
mainly earthquakes and typhoons, which includes earthquake and typhoon wind force evaluation systems, equipment damage assessment system, and emergency restoration process simulator in order to put it practical use inan actual target electric power supply area.

Main results
1. Application of a sequential update damage estimation system to actual electric power supply area
In order to improve the damage estimation accuracy of the proposed system (RAMP-Er) [N07027], an
actual earthquake damage record of electric power distribution equipment was analyzed in detail. As a result,it was clariﬁed that the damage rate of the distribution equipment was greatly inﬂuenced by not only seismic
force but also the presence of speciﬁc earthquake countermeasures including distribution pole anchor (Fig. 1),
micro-topography division of the surface ground conditions, land use conditions, and line connectivity types ofdistribution pole. It was also clariﬁed that the damage ratio of service wires was correlated with the horizontal
distance from residential houses. Furthermore, in order to solve a problem to underestimate the seismic force ofthe hypocenter neighborhood a hypocentral distance decision algorism for the seismic force evaluation system
was improved (Fig. 2).
2. Collection, analysis and delivery of typhoon information
An existing weather disaster information system was expanded as a client-server information system,
which communicates over the Internet. The server system distributes the typhoon information including winddirection and velocity, and precipitation of whole target area. On the other hand, the client system, which is called
RAMP-T, receives the above information and estimates the equipment damage degree. The expanded clientserver system enables us to visually, quantitatively and quickly forecast typhoon wind and equipment damage
conditions (Fig. 3). Note that in order to provide the meteorological information from the expanded system topower companies, some restrictions associated with the Meteorological Service Law were considered.
3. Development of tsunami information system
After an earthquake occurs, the developed tsunami information system collects and accumulates the sea
surface heights associated with tsunami collected by the 157 points tidal observatories in real time. The developed system enables us to divide the above collected the sea surface height into two elements; tsunami and tideelements and to display those elements for every target region on a map of Japan. Fig. 4 shows an example ofanalytical results of tsunami caused by the mega earthquake (Mw 8.8) occurred in Chile on February 27,2010 inreal time (Fig. 4).

34

Stable Power Supply Technology
12With pole anchor

Damage ratio(%)

10

Distribution Pole

Without pole anchor

87.5m-14.2m

6Ground surface

42
0
5

5.3

5.4

5.5

5.6

5.7

5.8

5.9

66.1

Measured seismic intensity

6.2

6.3

Pole anchor

0.3ｍ

1.5m-2.8m

Fig. 1 Comparison between service wire damage rate and the presence of pole anchor for each measurement of seismic intensity
Fig.1 shows that the pole anchor effectively decreases the service wire damage.

Measured seismic intensity

Improvement

Fig. 2 Example of the distribution of surface ground motion intensities
The underestimation for the surface ground motion intensity near hypocenter is improved. And the spatial resolution wasimproved from 1km mesh size to 250m mesh size.

Weather disaster restoration support system
Power Company

CRIEPI’s LAN
Red： development inthe 2009 fiscal year

NuWFASThe
MeteorologicalAgency ‘sobservationand forecastingdata

Weather disaster
information system(Server)
・Weather Forecasting(Precipitation, winddirection and velocity ,typhoon course)
・Automatic uploading to
the CRIEPI Techno-Web

RAMP-T（Clients）

Practical use

・Evaluation and display ofwind direction and velocity,and the duration ,start ,andend time of the strong wind・Estimation of typhoon
CRIEPI damage of equipment
Techno ・Display of the weather-Web
forecasting datasystem

・ Decision supportof the beginning
time of the restoration
preparation・Decision support ofrestoration staff
assignment
・Restoration planningsupport after typhoonis passed

Fig. 3 Concept of Weather disaster restoration support system
RAMP-T receives the typhoon information from the weather disaster information system via the Internet.
― Sea surface height (Acquisition data)― Tide element （Analytical data）― Tsunami element (Analytical data)(a) Chousi(b) Katsuura

Fig. 4 Change in water levels at Chose and Katsuura due to the 2010 Chili earthquake
The developed system enables us to extract the tsunami element from the collected water level.

35