Fault point location system

Details Fault point location system Fault point location system

1999-11-09

2002-11-05

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C324S535000, C455S503000

Reexamination Certificate

active

06477475

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a fault point location system. More particularly, the present embodiment relates to a fault point location system by which fault points can be quickly located at the time of a fault along a transmission and distribution line. Additionally, the present other embodiments relate to a fault point location system by which fault points can be identified on a map for which a transmission and distribution line map is automatically prepared in response to relocation and extension of the transmission and distribution line.
Heretofore, map information with power transmission lines and distribution lines (hereinafter designated “transmission and distribution line” or “TD line” for both lines) illustrated on a map has been available.
In addition, a method has been developed for locating a fault according to a difference in the time of surge detection at both ends of a straight TD line with no branch in the case where a fault occurs along the line. (Japanese Patent Publication No.Sho 63 (1988)-51274, etc.)
However, said map information with TD lines illustrated on a map has not been updated in real time in response to frequent relocation or extension of actual TD lines. For this reason, in an emergency case, quick action sometimes could not be taken due to a difference between a TD line map and actual TD line.
Moreover, although such a fault point identifying method as disclosed in Japanese Patent Publication No.Sho 63 (1988)-51274, which allowed for identifying the distance along a TD line from both ends thereof, wherein a surge was detected, precise location of the fault for fault recovery could not be determined on a map since the actual TD line was placed in a meandering fashion.
Still moreover, although an approximate point of a fault could be identified on a map according to the distance on the TD line from both ends thereof where a surge was detected even on a winding TD line, an actual TD line is not one line but arranged with a plurality of branches, and therefore, such a fault point identifying method as disclosed in Japanese Patent Publication No.Sho 63 (1988)-51274 cannot be applied as it is for locating fault points.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a fault point location system by which a fault point can be quickly located and identified on a TD line map for solving the above mentioned problems. Another object of the present invention is to provide a fault point location system that allows for automatically preparing a TD line map in response to relocation and extension of TD lines, and locates a fault point on a map in the case of an occurrence of a fault on a TD line.
A fault point location system of a first embodiment is a fault point location system comprising:
substations
1
installed along TD lines for sending information along said TD lines to a master station
2
, and the master station
2
for locating fault points on the basis of the information sent by said substations
1
;
characterized in that
said substation
1
has a clock function, receives radio waves from a GPS satellite to identify the current time the GPS has, is able to synchronize the current time said GPS has with the self current time, detects a surge current or surge voltage of the TD line along which said substation
1
is installed to identify a surge detection time, the time at which said surge current or surge voltage is detected, recognizes the polarity of said surge current, and then sends said surge detection time and information on said polarity to said master station
2
via a communication network; and
said master station
2
receives said surge detection time and information on said polarity, which are transmitted from said substation
1
via the communication network,
identifies a section with no branch as the section of occurrence of a fault on the basis of information on said polarity of each substation
1
, and
identifies the point of occurrence of a fault along the TD line on the basis of a difference in the time of detection of said surge detected by substations
1
at both ends of said fault section, and the length of said fault section along the TD line.
In the foregoing, the “GPS radio waves” are radio waves a satellite emits in the “GPS”. Additionally, the “GPS” is an abbreviation for the “Global Positioning System”, a system for determining a position on the basis of differences in time when receiving radio waves from a plurality of satellites.
In the foregoing, the “fault section” is a section with no branch that is identified as a section of occurrence of a fault.
A fault point location system of a second embodiment has, in the fault point location system according to embodiment 1:
said substation
1
comprising a GPS receiving means
11
, a time measuring means
12
, a surge detection means
13
, and a surge information transmitting means
14
b
, wherein
said GPS receiving means
11
receives GPS radio waves from satellites for identifying the current time the GPS has to send the current time said GPS has to said time measuring means
12
,
said time measuring means
12
has a clock function for synchronizing the current time said GPS has from said GPS receiving means
11
with the current time of said substation
1
and then sends information on said current time of said substation
1
to the surge detection means
13
,
said surge detection means
13
detects a surge current or surge voltage of a TD line along which said substation
1
is installed, identifies the time of surge detection time at which said surge detection signal is received on the basis of information on the time sent by said time measuring means
12
, also recognizes a polarity of said surge current, and transmits said surge detection time and said polarity to said surge information transmitting means
14
b
, and
said surge information transmitting means
14
b
sends said surge detection time and said information on polarity to said master station
2
via a communication network; and
said master station
2
comprising a substation surge information receiving means
21
b
, a fault section identifying means
23
b
, and a fault location identifing means
23
c
, wherein
said substation surge information receiving means
21
b
receives said surge detection time sent by said surge information transmitting means
14
b
and said information on polarity via a communication network, then sends said information on polarity to said fault section identifying means
23
b
, and sends said surge detection time to fault location identifying means
23
c,
said fault section identifying means
23
b
identifies a section with no branch as a section of occurrence of a fault on the basis of said information on polarity of each substation
1
and sends said section as a fault section to said fault location identifying means
23
c
, and
said fault location identifying means
23
c
identifies a point of occurrence of a fault along a TD line on the basis of a difference in said surge detection time of substations
1
at both ends of said fault section and the length of the TD line of said fault section.
In the foregoing, assume the “polarity” of a surge current “positive (+)” for ground fault current flowing from a source-side to a load-side and “negative (−)” for ground fault current flowing from the load-side to the source-side.
A fault point location system of a third and a seventh embodiment in the fault point location system according to embodiment 2 or 6, wherein, in accordance with said surge detection time t
1
detected at one of the substations at both ends of said fault section, said surge detection time t
2
of the other substation, surge propagation velocity v, and length L of the TD line of the section of said fault has occurred, said fault location identifying means determines distance L
1
on a TD line from one of the substations to the location of the fault along the TD line is determined by equation L
1
=(L+(t
1
−t
2
)×v)/2.
A fault point location system of a fourth and an eighth em

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