Appendix 4
Measurement Error of Powers
A4.1 Measurement error of powers
Assume the input power of a load with power factor (lagging) between 0.6 and 1.0 is measured with a current transformer (CT), an ammeter, a potential transformer (PT), and a voltmeter, as shown in Fig. A4.1. The ammeter and the voltmeter have an error of ɛA and ɛV, respectively. The CT has a ratio correction factor RCFCT and a phase angle shift γ measured in minutes. The PT has a ratio correction factor RCFPT and a phase angle shift β measured in minutes [97–100, Chapter 8].
Figure A4.1 Power measurement based on a CT, an ammeter, a PT, and a voltmeter.
The input power ...
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