Tomonori Nishida

Philip Orr; Pawel Niewczas; Campbell Booth; Grzegorz Fusiek; Adam Dysko; Fumio Kawano; Tomonori Nishida; Phil Beaumont

We report on the design and implementation of a novel hybrid electro-optical sensor for the measurement of electric current. A fibre Bragg grating is utilized to passively interrogate an air-cored coil via a low-voltage piezoelectric multilayer stack. Peak Bragg reflections are strain-tuned by the Rogowski coil/piezoelectric transducer combination, allowing primary current reconstruction to be performed remotely and without active electronics at the sensor. The preliminary embodiment demonstrates long-distance, passive measurement of current for metering and protection relaying applications, and retains the fiber transducers capability for serial multiplexing.

Philip Orr; Grzegorz Fusiek; Pawel Niewczas; Campbell Booth; Adam Dysko; Fumio Kawano; Tomonori Nishida; Phil Beaumont

We report on recent developments in hybrid optical protection schemes that make use of passive fiber Bragg grating-based transducers for the distributed measurement of voltage and current. In addition to the details of the hybrid optical sensor technology, and its full integration with a commercial busbar protection relay, we report on the first-time laboratory demonstration of a centralized three-ended unit protection scheme featuring hybrid optical sensors capable of passive and wide-area coverage. Furthermore, we discuss the impact of this technology on present and future protection applications that may be improved or enabled by the proposed scheme.

Akira Kawarada; Takahiro Mori; Michihiko Inukai; Hideaki Sugiura; Tomonori Nishida

Philip Orr; Grzegorz Fusiek; Campbell Booth; Pawel Niewczas; Adam Dysko; Fumio Kawano; Phil Beaumont; Tomonori Nishida

Grzegorz Fusiek; Philip Orr; Pawel Niewczas; Adam Dysko; Campbell Booth; Fumio Kawano; Phil Beaumont; Gareth P. Baber; Tomonori Nishida

Keiichi Kaneda; Minoru Okuda; Tomonori Nishida

Hiroyuki Maehara; Tomonori Nishida; Shigeki Katayama; Yukihiko Maede; Minoru Saito; Wataru Yamamori; Jun Takehara; Takaya Shono

Hiroyuki Maehara; 宏之 前原; Tomonori Nishida; 西田 知敬; Shigeki Katayama; 片山 茂樹; Minoru Saitoh; 齋藤 実

Hiroyuki Maehara; Shigeki Katayama; Tomonori Nishida; Michihiko Inukai

Keiichi Kaneda; Minoru Okuda; Tomonori Nishida