It is possible to obtain the differential voltage, line voltage, phase voltage, etc. by obtaining the sums and differences of instantaneous measurement values of voltage and current in each element.

Delta Image

  • Differential voltage/current: Differential voltage and current between two elements are computed in the three-phase three-wire system.

  • Line voltage/phase current: Line voltage and phase current that are not measured are computed in the three-phase three-wire system (Figure 1).
  • Star-delta conversion: Line voltage is computed from the phase voltage using the three-phase four-wire system data.
  • Delta-star conversion: Phase voltage is computed from the line voltage in the three-phase three-wire system (3V3A system)
    (Figure 2).
Figure 1. Line voltage/phase current
Figure 2. Delta-star conversion

Power Analyzers

Power Analyzers

A power analyzer measures electrical power characteristics of devices that generate, transform, or consume electricity. Also called power meters or wattmeters, these devices measure parameters such as true power (watts), power factor, harmonics and efficiency in inverters, motor drives, lighting, home appliances, office equipment, power supplies, industrial machinery and other devices. Power analyzers also enable engineers to minimize energy loss due to distorted, transient waveforms in power electronics such as inverters, motors, lighting circuits, and power supplies. 

Yokogawa, the world's leading manufacturer of electrical power analyzers, provides a broad selection to satisfy all requirements.

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