Transcript Wiring Three-Phase Three-Wire

Wiring Power Meters
Ben Kemink
Subjects covered:
 to re-wire an incorrect NEGATIVE average power
situation.
 to connect Single-Phase, Two-Phase , Three-PhaseThree-Three-Wire and Three-Phase-Four-Wire loads.
 to connect safely measurement transformers between
the loads and power meters.
 more about the magic of the virtual ground box
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Why ring?
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Make a drawing
i
u
Source
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Wiring
FORESIGHT
Load
Positive “DC”
I
+
U
-
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Negative “DC”
I
U
+
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Wiring Sequence
i
+
i

-
u
v

Always: First Connect the Current
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!
Correct Connection
The sign of the current is positive, when the current flows from [I]
terminal to [±] terminal inside the powermeter shunt.
The sign of the voltage is positive when the voltage of the [V]
terminal is higher than [±] terminal.
i
+
I
V


-
v
I

+
i
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V

v
The voltage source increases and the current also
p
Pavg
v
i
p
Pavg
v
i
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Incorrect Voltmeter connection
The power meter displays negative value for average power.
i
+
I
V
v


-
The source voltage decreases but the current increases.
i
v
Pactive
p
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Incorrect Current meter connection
i
+
I
V
v


-
v
i
Pactive
p
If the power meter displays a negative value for the average
power, one should refers the voltage connection.
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Connect CURRENT METER if possible in RETURN WIRE
Return wire is at lower voltage than “HOT” wire,
after the voltage drop in the load.
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Wiring Single-Phase Three-Wire
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Wiring Three-Phase Four-Wire
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Wiring Three-Phase Three-Wire
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Wiring Yokogawa Three-Voltage Three-Current
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The Only Correct Way to Measure the Phase Voltage!
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Justification that Ptotal correct is with Virtual Ground Box
THREE PHASE SYSTEMS
Artificial Neutral
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Single-Phase Two-Wire, with PT & CT
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Single-Phase Three-Wire, with PT & CT
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Three-Phase Three-Wire, with PT & CT
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Three-Phase Four-Wire, with PT & CT
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Thank you and success!
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