Introduction; Power Inverter Efficiency - Fluke 434-II User Manual

Chapter 13

Power Inverter Efficiency

Introduction

Power Inverter Efficiency measures the efficiency and amount of energy being delivered
by inverters that convert single phase dc into single or three phase ac. This concerns
inverters such as used in solar panel systems, variable speed drives and Uninterruptable
Power Supply (UPS) systems. The Power Inverter Efficiency measurement measures the
dc voltage and current that feed the inverter input. The ac ouput current of the inverter
unit is measured as well as the three voltages between the phases (A/L1, B/L2, C/L3).
Power Inverter Efficiency requires balanced voltages in a three wire (delta) configuration.
To check voltage balance on the inverter output, you can use the Voltage Unbalance
function (Chapter 14). Voltage Unbalance Vneg. should be less than 0.5 %. For Power
Inverter Efficiency it is not required to have balanced currents. Unbalance Aneg. up to
100 % is allowed.
The measurement is started with a clear diagram how to connect current and voltage
probes to the system. The measurement requires an (optional) dc current clamp (refer to
chapter 26, paragraph Optional Accessories or visit www.fluke.com to find a clamp that
fits your application).
Measurements: Wac, Wfund, Wdc, Efficiency, Vdc, Adc, Vrms, Arms, Hz. The
measurements are displayed in a Meter screen and a Trend screen.
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