Fault protection for a medium voltage transformer branch

Details Fault protection for a medium voltage transformer branch Fault protection for a medium voltage transformer branch

1987-03-09

1988-12-13

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 64, 361 89, 361102, 361166, H02H 704

Patent

active

047915200

ABSTRACT:
A fault protection system for a power circuit composed of a main current path and a plurality of parallel branch paths connected in series with the main current path and each containing a winding of a medium voltage transformer, which system includes: first and second switchable current interrupters for switching the current flowing through the paths and for protecting the paths against fault currents, the first interrupter being connected in one branch path for interrupting fault currents in a first amplitude range and the second interrupter being connected in the main current path for interrupting fault currents in a second amplitude range which is higher than the first range and includes short circuit currents; and current monitoring circuits connected for monitoring the current in the one branch path and for maintaining the first interrupter in the closed state when the current in the one branch is below the first amplitude range, for placing the first interrupter in the open state in response to the presence of a fault current in the first amplitude range, and for maintaining the first interrupter in the closed state in response to the presence of a fault current in the second amplitude range.

REFERENCES:
patent: 3873887 (1975-03-01), Barkan et al.
patent: 4240123 (1980-12-01), Hotta
patent: 4354215 (1982-10-01), Van der Scheer
"Kurzunterbrechung in Mittelspannungsnetzen" (Automatic Reclosing in Medium Voltage Networks), published by AEG, Jun. 1972.

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