Kabushiki Kaisha Toshiba

Nagoya Institute of Technology

Daiju Itagaki

Satoshi Hirano

Katsuhiko Sekiguchi

Itsuo Shuto

Shogo Miura

Hiroaki Ayakawa

According to one embodiment, the A/D conversion unit includes a &#x394;&#x3a3; modulating device which samples the analog electric quantity provided by the electric power system with a predetermined modulation frequency and outputs a bit stream changing over time of single bit obtained by performing &#x394;&#x3a3; modulation, and the digital operation processing unit includes one or more digital filters which inputs the bit stream from the &#x394;&#x3a3; modulating device and of which frequency characteristics differ according to a type of protection control operation, and one or more operation processing elements which perform different kinds of protection control operation processing, based on the bit stream provided by the digital filter.

Control system, transformer, protection control apparatus, and bit stream storage unit

In a digital protection relay with a time sync function, the sampling timing of which is specified based on a reference timing transmitted from a time signal generator to a time sync unit, with a determination value. The time sync unit includes a reception circuit that receives a discrimination code and time data transmitted from the time signal generator, a code discrimination circuit that discriminates the reference timing on condition that the received discrimination code coincides with a desired code, a time calculation circuit that calculates the sampling timing on the basis of the discriminated reference timing and the time data, and a sampling sync circuit that specifies the sampling timing of a digital quantity of electricity on the basis of the calculated sampling timing.

Digital protection relay with time sync function

Growing community of inventors

Tokorozawa, Japan

Daiju Itagaki