Electrical

Potential Transformers Potential transformers are extremely accurate-ratio stepdown transformers and are used in conjunction with standard low-range voltmeters (100-120 V) whose deflection when divided by transformation ratio,  gives the true …

Current Transformer A current transformer takes the place of shunt in d.c. measurements and enables heavy alternating current to be measured with the help of a standard 5-A range a.c. …

Ratio and Phase Angle Errors of Instrument Transformers For satisfactory and accurate performance, it is necessary that the ratio of transformation of the instrument transformer should be constant within close …

Instrument Transformers The d.c. circuits when large currents are to be measured, it is usual to use low-range ammeters with suitable shunts. For measuring high voltages, low-range voltmeters are used …

AC Potentiometer An AC potentiometer basically works on the same principle as a DC potentiometer. However, there is one very important difference between the two. In DC potentiometer, only the …

DC Potentiometer DC potentiometer is used for measuring and comparing the e.m.fs. of different cells and for calibrating and standardizing voltmeters, ammeters etc. In its simplest from, it consists of …

Electrodynamic Power Factor Meter Working Principle of Electrodynamic Power Factor Meter The Electrodynamic Power Factor Meter is based on the dynamometer principle with spring control removed. Figure A Construction of …

Moving iron Power Factor Meter Construction of Moving iron Power Factor Meter One type of power factor meter suitable for 3-phase balanced circuits is Moving iron Power Factor Meter shown …