A Self-Balancing High-Voltage Capacitance Bridge
- 1 December 1964
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement
- Vol. IM-13 (4) , 216-224
- https://doi.org/10.1109/tim.1964.4313406
Abstract
A self-balancing high-voltage capacitance ratio bridge, especially designed for continuous measurement of corona losses on experimental transmission lines, is described. The instrument is derived by combining a negative-feedback amplifier with a high-voltage capacitance bridge based on the current comparator principle. Manual control is provided for the four most significant decades of the bridge, thus permitting the function of the feedback amplifier to be limited to the balancing of small deviations. In this manner the errors originating in the amplifier and the associated indicating or recording instruments are made insignificant in the overall measurement. The accuracy of the built-in current comparator is 0.001 per cent, of the circuitry associated with the amplifier, 1 per cent. The output of the automatic balancing circuit is instrumented to produce a readout which is proportional to the power loss and reactive volt-amperes. Both components are in the form of small dc voltages and thus are suitable for recording.Keywords
This publication has 9 references indexed in Scilit:
- DETERMINATION OF AN ABSOLUTE SCALE OF CAPACITANCECanadian Journal of Physics, 1964
- A transformer-ratio-arm bridge for high-voltage capacitance measurementsIEEE Transactions on Communication and Electronics, 1963
- The development of the current comparator, a high-accuracy A-C ratio measuring deviceTransactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1962
- Recent developments in 50 c/s bridge networks with inductively coupled ratio arms for capacitance and loss-tangent measurementsProceedings of the IEE - Part A: Power Engineering, 1962
- A circuit for reducing the exciting current of inductive devicesProceedings of the IEE Part B: Electronic and Communication Engineering, 1961
- Project EHV-preliminary corona investigations: the effect of harmonics on corona lossesTransactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1960
- The Precise Measuremient of Small CapacitancesIRE Transactions on Instrumentation, 1958
- New Apparatus at the National Bureau of Standards for Absolute Capacitance MeasurementIRE Transactions on Instrumentation, 1958
- A direct-capacitance aircraft altimeterProceedings of the IEE - Part III: Radio and Communication Engineering, 1949