Countermeasure for EMP-E3 induced currents

Details Countermeasure for EMP-E3 induced currents Countermeasure for EMP-E3 induced currents

2009-10-19

2011-10-11

Patel, Dharti (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

C361S038000

Reexamination Certificate

active

08035935

ABSTRACT:
A countermeasure for mitigating Electromagnetic Pulse E3 (EMP-E3) induced currents flowing through the neutral of a star-connected three-phase power transformer without compromising its neutral end insulation performance. It comprises an external neutral-grounding device; a first linear resistor (R10) is connected from the transformer neutral (N) to ground (G) sized to render said induced currents, for any given EMP-E3 severity, reduced and inconsequential to the equipment operation. Contingently, a second non-linear neutral-grounding resistor (R11) provides a shunting path-to-ground of substantially low resistance, as prevailing by virtue of its non-linearity under large power system fault currents; such a bypass functionality is formulated/designed according to IEEE/ANSI/NEMA recommended insulation coordination guidelines in order to sustain proper protective margins to the equipment neutral basic insulation levels (BIL/BSL).

REFERENCES:
patent: 1865409 (1932-06-01), Boehne
patent: 5867358 (1999-02-01), Campbell
patent: 5883774 (1999-03-01), Kida et al.
patent: 7589943 (2009-09-01), Ramirez et al.

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