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Magtrol Model 5300 Three Phase Power Analyzer Chapter 3 - Connecting the 5300
3-PHASE 3-WIRE DELTA CONNECTIONS
The power dissipated in each phase (P
Ø
) is equal to the product of phase voltage ( E
phase
), phase current (I
phase
) and
cosine of the phase angle θ between the phase voltage and phase current:
P
Ø
= E
phase
× I
phase
× cos θ
Each phase power is displayed on the 5300 PA by selecting DISPLAY - Ø
1
,Ø
2
or Ø
3
push switch. Total power
consumed by the load is the algebraic sum of the 3-phases power measurements:
P
TOTAL
= P
Ø1
+ P
Ø2
+ P
Ø3
The total power is displayed on the 5300 PA by selecting the DISPLAY - ΣK
W
push switch.
P
TOTAL
= ΣK
W
Also, the general discussion for Figure 1 (surge protection) and Figure 2 (single phase AC & DC connection) apply.
Figure 3. 3-Phase 3-Wire Delta Connections
INPUT AMPS OUTPUT VOLTS
Ø1
Ø2
Ø3
HIGHLOW
EARTH
1
SURGE PROTECTION NOT SHOWN
5300 PA
2
INDICATES CABLING WITH 2 CONDUCTORS.
CABLE MUST BE FULL LOAD
R
R
W B
B
W
W B
R
Ø1
Ø2
Ø3
R
R
R
L1
L2
L3
LINE
1
FOR BALANCED SYSTEM
3
I
LINE PHASE
=
I
LOAD
LOAD
LOAD
CB
VOLTAGE SENSE
LOAD
2
2
LINE TO LINE
VV
PHASE
=
3-PHASE, 3-WIRE WYE CONNECTIONS
Power conversion formulas for the 3-phase WYE connection are the same as for the DELTA connection as described
above. Each phase power is displayed on the 5300 PA by selecting the DISPLAY - Ø
1
,Ø
2
or Ø
3
push switch. The
total power is displayed on the 5300 PA by selecting DISPLAY - ΣK
W
push switch. Also, the general discussion for
Figure 1 (surge protection) and Figure 2 (single phase & DC connection) apply.
Figure 4. 3-phase, 3-Wire WYE Connections
INPUT AMPS OUTPUT VOLTS
Ø1
Ø2
Ø3
HIGHLOW
EARTH
1
SURGE PROTECTION NOT SHOWN
5300 PA
R
R
W B
B
W
W B
R
Ø1
Ø2
Ø3
R
R
R
L1
L2
L3
LINE
1
FOR BALANCED SYSTEM
LINE
I
PHASE
=
I
LOAD
CB
VOLTAGE SENSE
LOAD
3
LINE TO LINE
VV
PHASE
=
LOAD
L
O
A
D
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