Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1988-10-14
1989-11-28
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324116, 324141, 364483, G01R 2106, G01F 1520
Patent
active
048840211
ABSTRACT:
Method and apparatus for metering polyphase power sources in which cycles for each phase are sampled at each degree and converted to a binary representation of amplitude. Sampling commences with a zero cross-over and a first digital conversion provides range data for developing scaling factors which are retained in memory and for providing a selective gain for amplifying. The scaling factor and the range data then are multipled to develop a digital representation of the sample amplitude which may have as many as 21 significant bits plus a sign bit. These expanded data valuations for current and voltage then are selectively multiplied for each degree sampled to develop data available for generation of 12 electrical parameter outputs. Generally, six of these outputs will be elected by the user. Volt amperes are computed with respect to the zero cross-over events for both voltage and current samples, while quantities such as Q and var are developed by selective delayed multiplication of the unit degree samples.
REFERENCES:
patent: 4077061 (1978-02-01), Johnston et al.
patent: 4080568 (1978-03-01), Funk
patent: 4345311 (1982-08-01), Fielden
patent: 4371943 (1983-02-01), Woods et al.
patent: 4459546 (1984-07-01), Arrington et al.
patent: 4615009 (1986-09-01), Battocletti et al.
patent: 4672555 (1987-06-01), Hart et al.
Electrical World, vol. 78, No. 9, Nov. 1, 1972, pp. 84-86, IEEE Transactions on Industrial Electr. & Control Inst., vol. IECI-28 No. 3, Aug. 1981, pp. 180-184.
IEEE Instrumentation and Measurement Conference, Boulder, Colo., 25-27, Mar. 1986, pp. 243-245.
Francis Eric R.
Hammond Scott H.
Kirk Ronald L.
Eisenzopf Reinhard J.
Nguyen Vinh P.
TransData, Inc.
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