Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-05-24
1986-02-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
361 82, H02H 726
Patent
active
045688729
ABSTRACT:
The invention concerns a method of direct measurement of a parameter characterizing a fault on an electricity line 1, such as the distance x or the resistance R.sub.d of the fault, the method being based on Ohm's Law including the line inductance L and the resistances R, R.sub.d. The signals respectively associated with the variation of current i(t) and of voltage v(t) at the measuring point M are operated upon by transfer functions the ratio of which is equal to:
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patent: 3593124 (1971-07-01), Cahen et al.
patent: 3612989 (1971-10-01), Souillard et al.
patent: 3931502 (1976-01-01), Kohlas
patent: 3983377 (1976-09-01), Vitins
patent: 4063162 (1977-12-01), Lanz
patent: 4251766 (1981-02-01), Souillard
patent: 4313169 (1982-01-01), Takagi et al.
patent: 4325098 (1982-04-01), Heller
patent: 4371907 (1983-02-01), Bignell
Mathews: "Series-Compensated Line Protection with a Directional Comparison Scheme"--Developments in Power Systems Protection Conference in London-England, 1/10/80.
Heller Isabelle
Loewenstein Paul
Enertec
Gaudier Dale
Krawczewicz Stanley T.
Solis Jose M.
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