Apparatus for detecting high impedance fault

Details Apparatus for detecting high impedance fault Apparatus for detecting high impedance fault

1993-08-26

1995-12-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 63, 361 78, 324522, H02H 342, H02H 326

Patent

active

054755565

ABSTRACT:
An apparatus for detecting differences between zero-sequence current caused by load unbalance and fault current caused by fallen distribution conductors. The apparatus makes it possible to readily check a high impedance fault. The apparatus includes analog-to-digital converters for converting analog A-, B-, C- and neutral phase current signals to digital data, respectively. The apparatus further includes a data processing system for computing even order power, rate of the even order to odd order power, and incremental variance of even order power. The apparatus analyzes the digital data and determines the fault when the computed information is compared with respective setting values and is greater than the setting values.

REFERENCES:
patent: 4300182 (1981-11-01), Schweitzer, III
patent: 4432031 (1984-02-01), Premerlani
patent: 4470091 (1984-09-01), Sun et al.
patent: 4878142 (1989-10-01), Bergman et al.
J. Carr, IEEE, Detection of High Impedance Faults on Multi-Grounded Primary Distribution Systems, Apr. 1981.

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