Load loss standard for testing and calibrating high voltage powe

Details Load loss standard for testing and calibrating high voltage powe Load loss standard for testing and calibrating high voltage powe

1987-12-11

1989-01-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Testing and calibrating electric meters

324 55, 324130, 323356, C01R 1132, H01F 4014

Patent

active

047959690

ABSTRACT:
A current-comparator technique for obtaining a load loss standard with adjustable loss tangent (or power factor) for in-situ calibration of transformer loss measuring system is described. The load loss standard, driven by the test voltage through a low-loss high-voltage compressed-gas-dielectric reference capacitor, simulates an inductive load which can be operated with load currents of up to 1000 A. For a 500 kV reference capacitor and a load current of 1000 A, the load loss standard simulates an equivalent inductive load with a rating of 500 MVA. Adjustment of the loss tangent (or power factor) is achieved by comparing the load current, using the current comparator, with in-phase and quadrature reference currents derived from the test voltage.

REFERENCES:
patent: 3390327 (1968-06-01), Bosworth et al.
patent: 4213083 (1980-07-01), Freygan
patent: 4258315 (1981-03-01), Westra
patent: 4467269 (1984-08-01), Barzen
patent: 4528498 (1985-07-01), So
patent: 4554513 (1985-11-01), So
"A Current-Comparator-Based Load Loss . . . Systems", E. So, IEEE Summer Meeting, July 12-17, 1987, San Francisco, CA, pp. 1-6.
"Calibration of Test Systems . . . Transformers", E. So, IEEE Transactions, vol. PWRD-1, No. 4, Oct. 1986, pp. 215-223.
"A Comparison of Instrumentation . . . Transformers", E. So, IEEE Transactions, vol. PAS-102, No. 6, Jun. 1983, p. 1570-1573.

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