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E-4

Overview, continued

Voltage and

current

connections

This section contains diagrams of both voltage and current probe connections that are

required when power measurements are to be made.

Voltage: Voltage probes are connected to the individual source or load line and are

referenced to the return (common) line voltage probe connection for greatest accuracy.

Current: Current probes are connected to each line and positioned to measure currents

with reference to the voltage probe. Incorrectly positioned current probes may produce

erroneous power measurement. Current probes are always oriented with the arrow

pointing to the load.

Phasor

diagrams

Correct phasor diagrams (for resistive loads) are shown for each connection.

In this appendix

The following connections are shown in this appendix.

Topic See Page

Verifying Voltage and Current Connections E-5

Single Phase E-7

Split Phase E-8

3 Phase, Four Wire Wye E-9

3 Phase (Floating or Grounded) Delta E-10

3 Phase 2-Watt Delta E-11

Generic Circuit E-12

2 1/2 Element Without Voltage Channel B E-13

2 1/2 Element Without Voltage Channel C E-14

Connecting to a Potential Transformer (PT) E-15

Connecting to a Current Transformer (CT) E-17

Connecting to an Isolated Current Transformer (ISO) E-18

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Dranetz Visa Guide de l'utilisateur Page 228