Current measuring apparatus

Details Current measuring apparatus Current measuring apparatus

1985-09-10

1986-12-16

Krass, Errol A.

Boots, shoes, and leggings

364483, 324 76R, G01R 1900, G01R 1965, G01R 1930

Patent

active

046302182

ABSTRACT:
A current measuring apparatus utilizes a known fundamental frequency, e.g., 60 Hz, for measuring current and includes a sensing and measurement pulse generation circuit including a current transformer for developing a low power signal directly related to the line current in a powerline, and a diode bridge with a first Zener diode for sensing when the developed current related signal exceeds a first predetermined positive threshold value and a second Zener diode for sensing when the developed current related signal falls below a second predetermined negative threshold value. Across the bridge is an LED for generating a first measurement signal having a duration related to the time when the developed signal exceeds the positive threshold value and second measurement signal during the time when the current related signal falls below the negative threshold value. The apparatus further includes processing circuitry and optical fibers for transmitting the measurement signals to the processing circuitry which is capable of processing the measurement signals durations (t.sub.1 or t.sub.2) to determine parameters of the developed current related signal thereby to determine the current flowing in the power line.

REFERENCES:
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patent: 3764908 (1973-10-01), Elms
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patent: 4399510 (1983-08-01), Hicks
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patent: 4561117 (1985-12-01), Kuhn
"A Users Handbook of D/A and A/D Converters" by E. R. Hnatek, Jun. 1976, pp. 246-249.
"Practical Digital Design Using IC's", J. D. Greenfield, 1977, pp. 498-499.

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