Fluke 434 User Manual download pdf (Page 58)

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Users Manual

13-4

unbalance should not exceed 10 %. In case of too high unbalance, use other measuring

modes to further analyze the power system.

Each phase voltage or current can be split-up into three components: positive sequence,

negative sequence, and zero sequence.

The positive sequence component is the normal component such as present in balanced 3-

phase systems. The negative sequence component results from unbalanced phase-to-

phase currents and voltages. This component for instance causes a ‘braking’ effect in 3-

phase motors: this will result in overheating and life reduction.

Zero sequence components may appear in an unbalanced load in 4 wire power systems

and represent the current in the N (Neutral) wire. Unbalance exceeding 2 % is considered

as too high.

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Fluke 434 User Manual Page 58