Title:
LINKAGE PROTECTION SYSTEM FOR DISTRIBUTED POWER SUPPLY FACILITY
Document Type and Number:
Japanese Patent JP3796657
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To smoothly execute calculation process.
SOLUTION: A circuit breaker 12 for bus-bar communication is inserted into a bus bar 16 which connects between a power system 4 and a distributed power supply facility 5; a passing current I is detected by a current detector 13; a voltage on the power system side is detected by a voltage detector 14; a voltage on the distributed power supply facility side is detected by a voltage detector 15; the detected current and each detected voltage are fetched in a control device 11; in the control device 11, an momentary voltage drop is detected by a combination of overcurrent or a current variation rate and a voltage drop, and a single operation is detected according to a frequency variation rate of the voltage on the distributed power supply side; and the circuit breaker 12 is opened by outputting an interrupting instruction from the control device 11 to the circuit breaker 12 for the bus-bar connection, when the momentary voltage drop is detected or when the single operation is detected.
Inventors:
Uchiyama Muneyuki
Yasunori Ohno
Hiroshi Arita
Mikisuke Higuchi
Yasunori Ohno
Hiroshi Arita
Mikisuke Higuchi
Application Number:
JP2001227211A
Publication Date:
July 12, 2006
Filing Date:
July 27, 2001
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H02H3/24; H02J3/38; H02H3/46; H02J3/42; (IPC1-7): H02J3/38; H02H3/24; H02H3/46; H02J3/42
Domestic Patent References:
| JP6245389A | ||||
| JP2037547U | ||||
| JP8172724A | ||||
| JP5002036A |
Attorney, Agent or Firm:
Hirotsugu Yoshioka
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