Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1981-03-18
1982-03-30
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
324 51, 361 68, H02H 726
Patent
active
043227686
ABSTRACT:
At each of terminal connected to a protected line section a current is sampled at an identical high sampling frequency, digitized, encoded and transmitted to an associated one of the terminals with the digitized data registered in a first buffer memory. Those processes are conducted under the control of respective clock pulses. Also a receiver receives similar data from the associated terminal. The received data are decoded and registered in a second buffer memory under the control of control signals from the receiver. A shift register successively receives the data from the first buffer memory and shifts them through it under the control of a shifting pulse to compensate for a known transmission delay between the data in the two buffer memories. The shift register and the second buffer memory write respective data into a processing unit in response to a writing pulse having a pulse width of a sampling pulse multiplied by an integer from the processing unit. The processing unit compares two sets of data with each other to determine if a fault occurs within the protected section.
REFERENCES:
patent: 3590368 (1971-06-01), Esclangon
patent: 4183072 (1980-01-01), Takagi et al.
patent: 4228476 (1980-10-01), Okita et al.
Goda Tadahiro
Maeda Kouji
Eisenzopf Reinhard J.
Mitsubishi Denki & Kabushiki Kaisha
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