Title:
PROTECTOR FOR POWER SUPPLY SYSTEM AND SYSTEM COMPRISING THE SAME
Document Type and Number:
Japanese Patent JP2018183034
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a protector that in a power supply system using a converter, is capable of protecting the whole system by detecting a short circuit accident on a distribution line, and a system comprising the same.SOLUTION: A protector 100 comprises: a harmonics supply unit 102 for supplying a bus with harmonics (harmonics of integral order or inter-order harmonics); a voltage measurement unit 104 for measuring voltage of the bus; a current measurement unit 108 for measuring current of a distribution line; a harmonic component calculation unit 110 for calculating a harmonic component from each of voltage and current measurement waveforms; an impedance calculation unit 112 for calculating impedance from voltage and current harmonic components; and a control unit 114 for determining, on the basis of the calculated impedance, whether or not a short-circuit accident has occurred on the distribution line. Thereby, the short-circuit accident having occurred on the distribution line is detected, enabling separation of the distribution line from the bus and prevention of outage of the whole system.SELECTED DRAWING: Figure 2
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Inventors:
UDA SATOSHI
HANEDA YOSHIHIRO
HANEDA YOSHIHIRO
Application Number:
JP2017242766A
Publication Date:
November 15, 2018
Filing Date:
December 19, 2017
Export Citation:
Assignee:
NISSIN ELECTRIC CO LTD
International Classes:
H02H7/26; G01R31/02; H02H3/40
Domestic Patent References:
| JPH1123627A | 1999-01-29 | |||
| JP2004074924A | 2004-03-11 | |||
| JPH1169893A | 1999-03-09 | |||
| JP2011114900A | 2011-06-09 | |||
| JP2016096659A | 2016-05-26 |
Attorney, Agent or Firm:
Satoshi Shimizu
Tetsuji Kamidai
Naomi Kamino
Tetsuji Kamidai
Naomi Kamino