8
臆膷膉臕 臆膇臟臕 臆膒腼膈臎臟臕 臑膩膏臎臟臕 腌腡膘臀臎腙膋膥腗腎腣膐膮腦膄臙腑腣膦腗腉腥腋 臈臞臃膈臆膒腨腩腱腰 膣臢腶膽腮腵腯腅 臒膃臃膈臆膷臣臅膛膓腮腵腯腅 臒膕臑臤膊膪膁膬 臚腏腤腓臧膙腗膌膿腏腤腓膴膠腚腞腗腉腢 腒腤腷膅腚 膆膭腧腵腫腅腲臓腗 臆膷臣臅腚膫膝腛腊腕腚膨臂腗 膺膟膝膲腛膚膂膻膞臙臥腚膡膔腙腑腡腘腔腖腊腘腊腚腍 腠膫膝腐腖腝腐腊腾膈膐膮腚膳腸腙腴腵腪腏腤腣腍 膝膵腗腉腣 腐腓腍腔腖臆膷臣臅腦膑臦腑腣膼腙膀 膫腙腛臒膃臆膷腚臄膎 臋膼臣臅腦膱腊腖 腒腚膫膝腽 腘腑腜腎膦腛 臊膎膍腶臍腙臆腻腚膵臁腦腊腥腊腥腘膌 臗膸腛膗腟腖臌腊 腒腚臒膃臆膷腙腐腖腠 膚膂膻膞腍 臙臥腏腤腣腚腛 膾臍腏腤腣膼臉腑腜腢腍臒膃臆臡腙臘 腹臔 膜臐 膧膢臝膤 膶臇臜腺 臊臛臖膖 腇腃腉腅 腗腢 腞腓腑腡腠腖腆腝腘腟腙腜腚腊腣腂腄腠腕腒腤腛腎腍腌腏 腐腋腆腔腈 265 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. pp. * e-mail : [email protected] Earth Watch - Safety Net Research Center, Chubu University Earthquake Prediction Research Center, Tokai University Tokyo Electric Power Co., Inc. We propose a new monitoring system by using the neutral current of transformers at substa- tions of an electric power company named “neutral current monitoring”. It means that we have been measuring the telluric field by using the power line system in order to monitor the electromag- netic state of the underground over an extended time period. The principle of this system is as follow : the neutral points of the transformers in the substations are grounded to the earth and power lines connect them. If the neutral points of the transformers correspond to the grounded electrodes and the power line between substations corresponds to the electric wire between the electrodes, we can observe the telluric field and change of the electromagnetic structure of the underground between substations by measuring the current which flows at the neutral point of the transformer to some extent. We found that the neutral current is a ected by various factors such as the geomagnetic changes and artificial noises like as the conventional telluric field observations. We would be able to investigate the underground electric conductivities near the substations by calculated response function between geomagnetic field data and neutral current data. : neutral current of transformers, telluric field observation, geomagnetic variation Jun Izutsu , Makoto Harada , Takeshi Terayama , Tomiichi Uetake and Toshiyasu Nagao * * Abstract Key words A Preliminary Report An Approach of the Continuous Electrical State Moni- toring by Using the Ground Wire of Neutral Point at Extra-high Voltage Substations + , - + , - + , - - , + , - - , 2- ,**2 ,0/ ,1, # +

An Approach of the Continuous Electrical State Moni

  • Upload
    others

  • View
    1

  • Download
    0

Embed Size (px)

Citation preview

� � �

� � � � �

� � � � �

� � � � � �

��

� � � �

� � � � �� �

� �

� ���� ���� ������� ������� ����� !"#$%&'()*+%,#-./

012���3456 789:;<=> ?@2���AB��;<=> ?C�DEFGH

IJKLMN#OPJKLQRST#-U VKWXSYZ[<\>]�# ��ABS^_`abScd# ef_g`hijk*lSmn +�opqaoaSrs^_tqutav�&'Swx y<zJK%r _ _{#-% tLrpq��AB(|}+%~ � r^ `?@��S�� �~AB(�aq VS^_� o+�$,` ���9� ��S{�(a.a.oO��`��q�a VS?@�� tqs hijkr*lJK%S` ��JK%~�+�Ur?@�� �

�� � �� � ���� �� ¡ �¢£¤

� ����

� �

� �

�� ������������������� !"#$�%&

� � �

� � � �

265

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

Earth Watch - Safety Net Research Center, Chubu University

Earthquake Prediction Research Center, Tokai University

Tokyo Electric Power Co., Inc.

We propose a new monitoring system by using the neutral current of transformers at substa-

tions of an electric power company named “neutral current monitoring”. It means that we have

been measuring the telluric field by using the power line system in order to monitor the electromag-

netic state of the underground over an extended time period. The principle of this system is as

follow : the neutral points of the transformers in the substations are grounded to the earth and

power lines connect them. If the neutral points of the transformers correspond to the grounded

electrodes and the power line between substations corresponds to the electric wire between the

electrodes, we can observe the telluric field and change of the electromagnetic structure of the

underground between substations by measuring the current which flows at the neutral point of the

transformer to some extent.

We found that the neutral current is a ected by various factors such as the geomagnetic

changes and artificial noises like as the conventional telluric field observations. We would be able

to investigate the underground electric conductivities near the substations by calculated response

function between geomagnetic field data and neutral current data.

: neutral current of transformers, telluric field observation, geomagnetic variation

Jun Izutsu , Makoto Harada , Takeshi Terayama , Tomiichi Uetake and Toshiyasu Nagao *

*

Abstract

Key words

A Preliminary Report

An Approach of the Continuous Electrical State Moni-toring by Using the Ground Wire of Neutral Point atExtra-high Voltage Substations

+ , -

+

,

-

+ , - - ,

+ , - - ,

2- ,**2 ,0/ ,1,

#

+

� � �� � � �

��

� � �

� �

��

�� � �

� � �

� �� �

� � � �

� � ��

�� �

� � �

� �� �

� � �

� �

� � � � � �

� �

�� � � �

� ��

� �

� �

���� ��� ������������

�� �� �!"# �$ ��

%&'(�)*��� ! ��� +

,-,).� /0)1 �2# �, 3 )1 . 4���,�� 5�678 ! ��9:!/ ;< =>!?9#@ )A'B6 ��.2� ,-, � !/ C��DEF�� ! G�A'B6 ��H/I:�J

6 K�/ L �MNOP6Q , =>@

,�A'B. �R�S 6TU 9)������� !U�� V,.W�"K) 6T*����- �;

�! ����� X!U�� Y��R9�

� ! 8 �,� V�����8 / Z [\C!�*� ] ^ )8 �/)�� �/�!/ �/)] I6 ,9 >� _`6 ���� � !U��/ 6 �� �8 ,�a# b!/ _`8 �cdYR��� >6 �� / e��5�f�� g!2� hi j��8 / 5��/k)*9!"����2� ;9 � !U��/ � l m .� ! L �/ /n � � �n o��)�p#m/@ ����� 5�@ )=>q _ .5�f� <Uk)� �,� �� �/r> !U���s �R�S � 4����� �n � / �tu���a# 5� � _` �� 6 I>� �,/ !/ v��wx!)# �cy�� z � � !a�� {v .)���/��. 9��yv|� / m � }~� @�9:! ��/1 �� m 65�;;

�� ����� >! _`.2 ,� �x!a"d��! �$ � 6� u . ���/)] 6 ,� �� �.�R "#� ��8 63K �.�

!� . �� ,9.*� !(PN R� . �2� ��! �� g/�� �6 ��y 6 �� 68 � I:� �] �'��� @ ,�a# �� �.S �)� � v|� 6 � L !"*� !)�����H� R)!a�� I�,� >� 6 I �2� 9�, ��m/��%&'(�)*�a

>� �5�f� ����� L ��� # ! >6 �� �/)�H! ^66 ,� � >� 6 �� K .2� ! � � � �6��B�N���H.S �)� _` � �� 6��,-,).� 8 !/ ���"K)� � 4��� . _`�/)] �9: � � � 8 !"� /

���y . �)�����H� 8 6 �,� !{ .� � 6 ,���S . 4�� �y¡¢£

) >6 �� �/)� U;#�� �/� -� !3?���9 { �/ ¤ )[\ !"*� ! R) .

¥¦� 6§¨m�,�� ©68 ,��� � 5�9:! \ . ª���H«.9�9�8 +¥¦� � ¬ � )W . ,��� ­]/ !M� �2�y ® ��"K! / [\� ¯�¥ ���'xP.8 ��9°W� ¤ )[

6± ,���H�H �2# [ ! \ r!�Y�� ².� !³*9 �. V�� e�� �´ �µ �R�H-� ¶ ���a# · �/ ¸ ! ,9 ¤

� � � � � �� ��

�� �� �

� � �� �

����� �� ��

� ! " # $" % $ &'

($ )* +, -$ � �� ./$ 0 )*

1 2345 �6 7 � ( )* 89 : ��;(< =9>��;( ?=9>�� 9@* A B

- �� ; ? ; C D E F ; GH�� � IJ K > � LM � � �� =; N � ; 9> � �� OP� Q

R ;S< S<LM T U� �� V �

- �6 7 �6 3 W ��� X ( ( Y� X �� �Z 4 89 %

3 � ��� [\ � ;( �]� � ��> ^4$ �� � =9>

_��� `a ��� b � ;(=9> �6 V c dec f =9>��;(S % �6 V g

T� T `��� � � �h � ��U �� � =9T > i ;( j ;�6Jk �� � =9> > g> =9T > T Q�� J� =9> � �� ; l ( cm ^

8 � =9T > �� �6 7 nD � o;( T � ��� ��� � �6�� p �6 7 �� qr > � �� s t

�u g� ��� ��Jk � � +, =9>�� ;( ^ [\� 8 �� � ;( � v

3 ; M %

; � �� ; w =9>�� ; ��;(=9>T ��� w ; x$ o �

y �U z 89 % S �qr > � �� { |6$ �

S � } ~ � � ��Dw ��� ; � � Jk �; T � ��� �� �� �( B =9>�� �� ; � }���� � C U�Z p ~ �� ��8 ?OP� � � ( � � � � �� �

�������

� ��������

� � � �

266

Fig. . The conceptual figure of the measurement of

the current by the power line system.

km km

Uyeshima,

Fig.

Fig.

GIC Geomag-

netic Induced Current

: Albertson , Lundby

Boteler

et al., et

al.,

et al.,

+

+*

+*

,*

+

,

+,*

,**1

+

,

+

+

+

+31.

, , +32/

+332 +2.1

+323 - +-

,

-

� �� � ����

�� �

��

��

� ��� � �

� � ��

� ��

�� � �

� � �� � �� � �� �

�� � �

� ��

� �� � �

� � � �

�� �

� � �� � � ���

� � �

� �

� � ��� �� ������������ !"# � $%&' ( �)*+,- !"#�.� �./0 12 � �3456(7�8 &9:� ;� &<=

/> ? & @ �$% �A ( B � � C D(��= /> E�.��=F �G ��H�)IC(� �����J���=&K � � � L/0MN C O� �&4P Q=6C>�P ��R+S� T=U.� 0 ����H � �A 7�VW ><XY Z[�����\ � ]^> A ���� C\Q= F &A /4=�/>��_C`T

� $% � a�( �Y � A �J�� ]

b �c / ( d e � f� M�g��hi+� [ � � j� $ �A C(� �A � Q

/ 2 �F � k�A l> �A (��= /<Y mn>(�C Z(��= 6�X/ j� K � �A (���� /<= �>A

&A [���>6� o;/<=& 6 �pq(� _^ X/�6� r/ (�K � >A /0 1 s > ( � � t 0 � (��7Y P�u /<��_0(��� A > � �= �adU_ /> v � (��= <= $%�wx�y � V z

�m{ � / �A � �#|} a� Y ; �( � ��= �J���� X ~}�/ (��= A 1� �-� �P/ (� � �� � ��+�C� D�6C0`T ��Yy 1 �

�+�����# ����&A [��6 � ��� (��=C� Z(��= �7 ��n/ (�� A > � �S�

U_ �V U_ />6� � ��+� CQ=���,+}C � ���w� & � �� � F &�� ���� � [�� A /<= � A/<=C� (� �/� �����i�+ > 7�V �� & [��7���J��� 8��� �& 1� t Y [^� R�"#   � C(�¡/>�P 1�¢ � ��C6£� ( � A _^ � � ¤Y¥.w ¢¦Q= L&§0 4� & �=6C� / � X/� �A (��= 6( �C �¨© �� ���� �= �� A /A [�� C C� D� 4[& 4PF�=6C� (��= >j /Jw

c /> �ª« ¬­ ® �¯ � c �A � Q=°¦X/���_^G Q=�H b�Y � A � � C(�2±� & (��= �CT²³pq(� ] \ /� U_´�µ¶( ­ & D ­ � r/<=d · � � ��= �A (�7¸ _^ ¸ /A � Q=6C�( Y �C � �� k �V �¹

������ � ��

� � ��� � ���� � � ��

�� � ��

�� �!"# �$� ���� % & ' � �( )

�� * +� ,����

� � - .�/ ) �� �( 012 3

�� � 4+5 ����% 6 78" 9 ���� % �:

� �� + % ;<=�$ � ����� � 1>

? ���� �� % 9? � � @ ��! AB C�$ DE �$ DFG�$ H

I �: J ; �$ %� %�K> L<=�$ � + ����� % M ���� % �$

7 �:J � �� ���� % �$ N %���( % � ? ? � AB

�: %�OP ? Q. AB �: : @R S� LT U % ����� � � VW�X@ %

Y #Z" 0 [ � \]^ � ^ _ 1D` ab c^ $ �$ ���� % ����� d� e f �g� �( hi��%4 j6 %� S k�$ AB �: l �:ABJ ) � m

���� n % j6o> � p7 L q %�rs t`u# v �w # ������( : f 5 + q 1> �� %� q %

4 �xf � yZ #8 zW/ %� 1>: �$ � {� � � |

�$ } Q.} ~ q %� # � � � �� }- � ���� � L | yy8/ %� %

: �$ 5 > � ��� q %� % �� ���� )� � � �� �

# " �:J� � ( � �� # " % � ���� ? ���� �� % � �� � �� �

�� G #OP �:ABn�: (. ) 5 A � C �5 � �( hi�� %

#! u�= 8! % �� # � S� �O �� � �

� ���������� ���� � ���������

��

267

telluric field observation station, and hypocenters from

Fig. . The distribution map of substations, the Atsugi

to .

Al-

len

kV

kV

. . km Fig.

A

kV

Hz

GPS

Fig.

NTT

. km

Izutsu

et al.,

et al.,

,

,**, ,**1

3

0**

+323

+33, /**

/**

+330

,*** +333 3 ,, +3 +1 -

- * ++ 2 ,

-*

+ ,**, ,**1

+*

,*** ,1/

,

,

,**- ,**-

,

+ .

- ,

,**, -

,**- ,**- ,**0

+

. /

� � � � �� � �

� � � �

� �� �

� �� �� �

�� �� �

�� �

�� �

� ��

� �� � �

�� � �

� �

� �

���� � ��� � �� �

���� !"#$� �% !"#$�&'(

�)*+�,� - �./01234 �

� 5 6 78 �9:',;(� ! <�=7> 7?@AB7CDE@�9:',�F G,�7> !H 4 �IJK �

L07M N�OP� 6 7 ) �Q R �I JK 0S��� TU79:CAVW0!X ��9:N09:',� �� Y 7 Z[� \�� 9:]^_`a)�;(�(�b70S� 6 �! �c�, G7 !9:de;79: �O(; fg"#$7hiZjP k 7�l )m% d� ! �

� L07no N7 6 )no� � 9: ! p q�r% s��7 N7tuv7wxyA9: 0S�z 7�l{ 7hiZ �%jP;Ov | ��} ��P Z[�� 6 7 ?]^~!�l7; ��"#$�� �;(� ! � )m% �;(�� �l7 ) 6

�� L07 � N7 6 4 7 !SLvm( Zc�;O�� �l 7�^]0S� - 7 q!9: �r( �� � 6 ���dhi!T4 0! 0S��Z >d� 8 s7 >4�0Sv � �c; '��I 7�^]0 �d�)no N7 6"#$7�^�4� 8 s� N rZ >�;( �^]! ��d����Sv mvb'

�� (k�7 � Ud�� 6b Ud�! �7� � ( ��� ���=5�� 7 6 �^]Z�^K� ��k I �0,�� � �¡ q�¢,;£�a¤¥@� �� �^]Z¦§d�) de;79: �O(; 4 ��� s�¨©�;(�4 0Sv ª,«¬7 4 4 4 �=7 4 k�7­ Y�c�,� �G74 �!c�,�(®��b"# � ¯�;(�®� �� L� 9: 7 0!t$°� ±7 q0S�®�²³0�� bz�r(no N0! \ ´ k

6 �! µ ¶° ·^<¸¹ ·^ ¸ \ ´ k � 0��®�

� � � �� ��

� � �

� �

� � �

� � ��� � � ��� �� � �

�� � ��� �� � � ���� � ��

� ��� �� ��� � ! �� "

#�� � �����$ % & � � ' � ( #�� � )*�� � + � �� � ��� ��� , �� " ��� � �� � % &�� � ��� �� ��� " �

� � � � � ��� � -./ $ 0 / 12 3 #�� � �

$ 0 �� 4 / �� ��� �� 5 6 5

78 9 � � ��� � : ;< = � � �

0 � � >: �� ? @. � �

A�� #�� B C D�� ��� �E F G H B B C � B I J @.

��

� �

� � � �

268

Fig. . The fluctuation of neutral currents and geomagnetic components observed at the Kakioka geomagnetic

observatory during the large magnetic storm from Nov., to Nov. , .

Fig.

Fig.

JR

Fig.

JR

JR M

O

-

3 ++ ,**.

,**. ++ *3 ++ ++

2 ,/

-

,***

.

/ ,**,

,**1

. ,**/ 2

,, ,2 ,.

++

,.

+, 2 0 ,.

-

,

+

��������� ���������

� ��

��

� � � � �� � � � �

� � � � � � �� �

� � � �� �

� � �� �� � � �

� �

�� ���� !"�#$%&'( �)*�+ ,-./'(012013�456 78�+9:�;4< =

' > ? @AB @CD$E"�#D FABGH'AI;JKLMNO+PQ�;R ST$����UVWXY�456,-D$��Z[VW \456S]^"�#$����U(_`abcMNOXY� deW� W�f ghGi +0ij � �$@"k'lm�R"nopBqR

�rW� W�f ghGi d ,-$�st%'uR�v��W�eW� W�f ghGi deW� w ,- <xyz{|$fW� '(}~W�f ghGi ��W� W�f '�MNO���$�Jw�Y��N�$"nLy+

ghGi AB ��W� W�f VWiq;R VW$��AB����U( � �ghGi AB ddr��fW "n'lm�;"n�;4< ��$��UW���

� W�f ghGi AB ��D$ � � �"n'5�;J�'������U�W��� �"n$� ��� ,-D$�� 456}~� ;R��R C� %j�9:�;R� AB$

� �������

269

Fig. . The figure shows the daily variations of the neutral current observed at the Higashi Yamanashi substation

from Aug. to , . The open rectangular on Aug. shows DC-driven train stopped due to Typhoon No. .

Fig. . The change of the neutral current at the Shin-Hadano substation and the temperature at the Ebina AMEDAS

observatory from to .

JR

JR

Fig.

ch : m m ;

ch : m m ; ch : ch ch

m m ; ch : ch ch

m m ; ch :

m m m ; ch :

m m m ; ch :

m m m

.

,, ,2 ,**/ ,, ++

/

,**, ,**1

0 ,**- 0 + -*

*+ +.2 +

*- +-+ + *3 *+ *-

+.2 ,* +* +- +0

+.2 ,* ++

.3 + /* +-

.3 + /* +0

-.-* .2 -*

0

� � � � �� � � �

� � ��

� � � � �� �

� �

� �� �

��

��� � � �

� � � � ��

� �� � � � � � � � � � �

� �� � � � � � � �� � �

� �

� �� � � � �� � � � ��

� �� � �� �

� �

� �����������

! " #$%&'# (� !)��* +�,�

-./# 012 34" 56 751894:�

7;1,<=> ?@189�?�ABC4DE F)G�H34:� <I+ 1JKABC4 !>�?��)�LM3 NOAGPQL�RS I+ #ETU � VL " 56 75#WX (1Y�?�ABSZ [#\ ]� ^ )U>Q4 ]A_`a@b?A cd�_`a@4:�L9 L�efg h U ^)#DE� E#6 75),�#)^#ETU � g hX#$ �g h gi ^" )I+ Mj)�kDEG WA !>X#$ ��lm34:��ne<@ ?@1o#B � �,�� ]pqT# r s ),�DE�tAne�F�uv#wx),� E# Ay z�����l >�� b#���#

L9A r s X#{7�|k�S }~�6 75�8V<�:�@�,� ���#6 7518943

$D� �I+ #����),��U? Vt* +�,� ??)Ub@1� >� zGF@V)#��F<G��a@�� BS� z� �# �4 ��$D� !^#DE-./ s �L9 ??)U��� �34 ) s 1��A2 3L��a@4:� ��.���� �1 :L6 75 gi ^#I+ -./#��$D�-./��1 :4��1��CL " 5 �)#I+ A�>�" 56 751 A�> ���1 �34 " 5 �)#DE� s 1 #�  �� #¡ �%�

DE� �s 1 �>�� DE� #�  %� #¡ 1b@¢@�34RSs #]pqT�34I+ 1 >?��)� £¤U"¥ ¦¤�;5#01�34:� §¨.©.ª#7;#«�sS ¬ U ­ ®F<89L #¯ °X),� ??)

U ±#gi I+ RB²��$D�

?#" 56 75 U� zA ;5#0U5 ³%#"¥)U§¨.©.G��k´µ5),S DE �I+ �#� z� �34:�:� 1¶e��"¥s )U ·

� � � � ��

� �

� � �

� � � �

�� � �

� � � � � � � �� �

� � � � � � � � �� ! "

#� $ ! " �

� � � � � % &

' ( )* " �+ " �

� � � �� � , � � �

� , -)* " . .-� " . .

- " � /0 1 2 3

� � �

� � 4 5�6 � � � ' � " 7

� �������� ������

� �

� � � �

270

Fig. . The neutral currents at each substation and the electric potential di erences at Atsugi station observed

from June , to June , . The geomagnetic variation at Kakioka, the temperature and rain fall at

Atsugi station are also shown.

Tanbo

Harada

Fig. TF

I TF TF

Hx Hy TF

· ·

TF TF

,

x y

et al.,

et al.

I TF H TF H

0 #

+ ,**- -* ,**-

,**,

+

,**.

1 +

+ ,

,

3/

,**. +++ ,

+ ,

+ ***

1

w w w w

w w w

w w w w w

w w

������� �� �������

� �� �

� �� �

�� � �

� � �� � � � �� �

� ��� �� �

��

��

� �

� ��

� �

� �

������ !"#$%&�' (��)* +,-./��0 (��12 3 4#5 ,-67�!8 9:;<=�>?@A&=�� B !� � C;D E;F4G4H&# IJKLM(!N�� 5HE2'O#@P

�Q!���� ,-#R�-���'!HES T@UV�(W'# X Y �Q!Z[ ����� C�F4\= ]H5 ]EH^ _ ; `!��)*_ (abc :�1��� X Y �QH5 W��@��)* ' d!efeN� ; Ea&�ghi\# j+,- k lm nJo p�q�� r st@uv� wx;��)* +,-!yz� -�{ |} k �< ~ �� ���./�(�� � ���� ./�E�%W~ ���� E ] !X Y���� 'IJKLM��� B !� ����ES

�! C�F4&�P

|�� Ea'��� �QE�^'���� !-�; a����W ��U���@A' �W%@!,-yzH5 ���� ./�! ��jr �2'�(#@P E ���� ;�� :E�Pb���W'!@ �!��� ¡'�(Ea&�,-�� !�¢!� �£¤�u�2'�(U¥ HU�W4���� ; ¦ !�� -�!-�Ee§2'��# ! �Q7@ ���'!@ ¨©E�Zª B �-���'U!@;4 ¦&� (!« @�¢£¤�$='�(; � �H�¬­@$=� ��N ;�¢!� �£¤!®��¯(°G5W'!@ �Q!± @ ²!,-�F&��!yz( ³2'�(@ d�´�µ^'�(;¥ @A¶\ wx; �¢!� �£

� �

� � ��

� � � �

� � � � �� � � ��� � �� � � � � � �

� � ��� � �� �

� � � � ��

� � ��

� � � � �

! "

� # �� $ � �% &'( & )* �+ � , -& . �

"

�������� ��������������

���

271

Fig. . Calculated inter-station transfer functions

between the Shin-Hadano neutral current data and

the Kakikoka magnetic data.

Fig. . An example of the temporal observation near the Shin-Fuji substation on December , .

m

: LS Hz .

: m m :

Fig.

MT

MT1

2 , ,**2

,**2 ++ +,

0**

--/* + * 1

.* .*

2 +, ,

,**,

2

3

��� ���� ��

� �

� �� �

�� �

�� ��� �

��

��

� ��� ��

��

� �� �

� � �� � � � � � � �

� �� � �

� ��� � �

����� �� �������� �� !���

"# $ %& ' () * +, - . /

!���

0)12 3456 0 7 8�9�����:;<� �= > ?@A�B ?�

&C>D EF "# $ G H��I�J ��KLMNOP JQ� R��KL�ST<�� U� �������� �� !���

EF V W G "# $ &C>DXY���� Z<J� ��[\J] �J�

MNOP�� JQ� R��KL�ST<��U� �������� �� !���

+, - V^_ C`abc �JQdefg h

V W �i���\J9jk�J� �=l��������� m�X���

"# $ G EF &C>D ���� nop[qrKL[�Ss�� JQ� R��KL�ST<�� U� �������� ��

� �t

tu �

t ��

t �

t t

� �

v� wxyzpT<{ |}~��� �� x�����

�L�J����i�����J��nopx������ ���� �S��>�� �� �i� ��A�<�� ��[��Z:� �������x ��T �k�>�� �� ¡¢£V^_£����¤¥�¦¥ § �S�A :¨������ > A� � � ©ª«¬�­ ® �i¯ h� °J� ��x{±²��� ³´µ����x ��T

� �

� �

� � �

�� ��� � � �

� � � � � ��� �

� � � � � �� � �� � � �

� ��

� � �

� � � ��

� �� � � � �� �

� � � �

� � �� �

� � � � !

� � �� � " # �

� �

����

��

� �

��

��

� � � �

� � �

� � �

� � � �

� � �

272

GIC No.

Uyeshima, M., , EM Monitoring of Crustal Processes In-

.

Izutsu, J., T. Ochi, T. Uetake and T. Mutakamihigashi, The

relationship between the current through the trans-

former neutral point and natural phenomena, IEEJ

Transactions on Fundamentals and Materials, ,

No. , , .

Lundby, S., B.E. Chapel, D.H. Boteler, T. Watanabe, and R.E.

Horita, , Occurrence Frequency of Geomagnetically

Induced Currents : A Case Study on a B.C. Hydro kV

Power Line, Journal of Geomagnetism and Geoelectric-

ity, , .

:

.

.

Albertson, V.D., J.M. Thorson Jr. and S.A. Miske Jr., ,

The E ects of Geomagnetic Storms on Electrical Power

Systems, IEEE Transactions on Power Apparatus and

Systems, , No. , . .Allen, J., L. Frank, H. Saver, and P. Reif, , E ects of the Tanbo, T., Nagao, T. and Sakai, H., , Geoelectromagnetic

March Solar Activity, EOS, , No. , . study using the leak current from railroad as a signal.Boteler, D.H., R. J. Pirjola and H. Nevanlinna, , The Application to Ohtawa Station, Gifu Prefecture, Ja-

E ects of Geomagnetic Disturbances on Electrical Sys- pan , Proc. Japan Acad., , Ser. B, .tems at the Earth’s Surface, Advances in Space Re-

search, , No. , .

Harada, M., Hattori, K. and Isezaki, N. : ”Transfer Function .Approach to Signal Discrimination of ULF Geomag-

netic Data”, Phys. Chem. Earth, , pp. , . cluding the Use of the Network-MT Observations, Surv.

Geophys, , , DOI . /s - - -x.HV- - .

.

Received June ,

Accepted February ,

EMC- -

-A

EMC- -

EMC-PAS- -

EMC- -

+33, 1 .-*

,**1

./ .3

. ,-- ,-1 ,**0

+32/

/**

+*31 +++.

,***

,-- ,.,

,**-

,

-3 ..

+31. ,**-#

+. +*-+ +*.. -1 .,

+323 # ,**,+323 .0 +.13 +.22

+332

# +13 +2.

,**-+ +1 ,1

.- .0

.*3 .+1 ,**.

,*** +33 ,-1 +* +**1 +*1+, **1 3*,-** / ,/ --

,**- .--

,. ,**2- ,1 ,**3

.

,.

*- ,-

+,0

-1

,*

*- ,,

3- *- 1

1*

12

,,

*- 2

,3

,2