Precision Loss-Measurement Meters
Class 0.2S accuracy where the power factor is almost zero.
Transformer loss testing is the hardest measurement on the routine-test bench. No-load loss is measured at a power factor close to zero, where a small phase error in the instrument becomes a large error in watts, and an ordinary meter that looks excellent on a resistive load stops being trustworthy. This meter is built for that condition, at Class 0.2S and 0.5S per IEC 62053-22.
It implements the extended power definitions of IEEE Std 1459-2010, which separate fundamental from non-fundamental power. That is the correct framework once the test waveform is distorted, and it is what lets you report a defensible loss figure instead of a number that depends on the harmonic content of the supply. Voltage input runs 5 V to 600 V, current arrives through CTs, Rogowski coils or flexible clamps, and the meter registers active energy to 999.9 GWh and reactive energy to 999.9 GVArh in single-phase, two-phase and three-phase modes. THD, harmonic power and K-factor are measured alongside. Supply is 5 VDC, so it integrates into a bench rather than occupying a rack position.
Why it matters
Class 0.2S accuracy is the reference level a routine-test bench needs before its loss numbers can be defended to a customer or a witness inspector.
IEEE 1459-2010 separates fundamental from non-fundamental power, so a distorted supply does not quietly move the reported loss.
Current input via CT, Rogowski or flexible clamp means the same meter follows the test object from a small distribution unit to a large power transformer.
Single-phase, two-phase and three-phase modes cover the loss test, the motor efficiency test and the laboratory reference role from one instrument.
THD, harmonic power and K-factor come with the measurement, which is what you need when the question shifts from how much loss to where it came from.
Ratings
Supply: 5 VDC
Voltage input: 5 V to 600 V
Current input: Via CTs, Rogowski coils or flexible clamps
Active energy: 0–999.9 GWh
Reactive energy: 0–999.9 GVArh
Accuracy class: 0.2S and 0.5S per IEC 62053-22
Modes: Single-phase, two-phase and three-phase
Advanced quantities: THD, harmonic power and K-factor; the extended power definitions of IEEE Std 1459-2010
Standards
IEC 62053-22 (class 0.2S / 0.5S)
IEEE Std 1459-2010
IEC 60076-1 loss measurement
IEEE C57.12.90
Applications
No-load and load-loss measurement on transformers
Motor and generator efficiency testing
Routine-test bench instrumentation
Laboratory reference metering
Questions engineers ask
Why does transformer no-load loss testing need a special meter?No-load loss is measured at a very low power factor, so the active power is a small component of a much larger apparent power. A phase error of a fraction of a degree in the instrument then produces a large percentage error in watts. A Class 0.2S reference meter designed for low power factor keeps that error inside the tolerance the loss guarantee is written to.
What does IEEE 1459-2010 add over conventional power measurement?IEEE Std 1459-2010 defines power quantities for non-sinusoidal, unbalanced conditions and separates fundamental from non-fundamental active and reactive power. Under a distorted test supply, conventional definitions blur the two and the reported loss shifts with the harmonic content. The 1459 quantities make the result reproducible across benches and supplies.
Technical documentation
Download HVEX Acquisition Electrical Quantities and Loss Meter datasheet (English, PDF)
