What is a Varmeter?

What is a  Varmeter?

Varmeter Definition

A varmeter is defined as an instrument used to measure the reactive power in an electrical circuit.

Single Phase Varmeter

In single-phase varmeters, the pressure coil voltage leads the coil current by 90 degrees, and the reading represents the reactive power.

Polyphase Varmeter

Polyphase varmeters use two auto-transformers in an open delta configuration to create a phase shift for measuring reactive power.

Reactive Power Measurement

Reactive power is crucial to measure because high reactive power leads to a poor power factor and increased losses.

Harmonics Limitation

Single-phase varmeters may not measure reactive power accurately if harmonics are present in the circuit.