Panasonic Intellectual Property Management Co., Ltd.

Masataka Kanda

Atsushi Nakamura

Hiroshi Yoshida

Hiroaki Koshin

Takuya Kagawa

Satoru Ueno

Kenji Yamaguchi

The electric power system protection device according to the present invention includes a transformer including a primary winding and a secondary winding which are electrically isolated from each other. The primary winding is to be connected to a first electric path which is to be connected to an external power supply configured to supply AC power by use of a secondary battery, so as to receive the AC power from the external power supply. The secondary winding is to be connected to a second electric path to be connected to a power supply path from a commercial electric power system to an electric load.

Electric power system protection device, electric path switching device, and electric power supply system

A first coil is wound around a first core, and have one end that is connected to ground and the other end that is connected to one end of a second coil. The second coil is wound around a second core, and has the one end that is connected to the first coil, and the other end that is connected to an excitation unit via a current-limiting resistor. A magnetic flux is generated in the first core by an excitation signal outputted from the excitation unit. Induced electromotive force is generated in the conductor due to the magnetic flux generated in the first core. The direction of the magnetic flux generated in the second core is opposite to the direction of the magnetic flux generated in the first core, and the induced electromotive forces of them generated in the conductor are cancelled each other out.

Current detecting device

Growing community of inventors

Osaka, Japan

Masataka Kanda