GE 469 Instruction Manual page 216

469
Motor Management Relay
6–18
Phase Rotation
Vca
Vcn
Ib
Vbn
Vbc
FIGURE 6–7: Phasor Diagram for Open Delta Example
Table 6–1: Three-phase Open Delta VT Connection
ABC 0.3 pf
Rotation (72.5°) lag
Va 0
Vb ----
Vc 300
Ia 100
Ib 220
Ic 340
kW +
kVAR +
kVA +
ACB 0.3 pf
Rotation (72.5°) lag
Va 0
Vb ----
Vc 60
Ia 45
Ib 285
Ic 165
kW +
kVAR +
kVA +
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System Voltages:
Vab
Vbc
–Vbc
Vca
Ic
Measured Voltages:
Vab = VA (G2 – G1)
–Vbc = VC (H2 – G1)
Vab
Calculated Voltage:
Vac = Vab + Vbc
Van
Displayed Voltages:
Ia
Va = Vab
Vb = 0°
Vc = –Vbc
0.7 pf 1.00 pf
(45°) lag (0°) lag
0° 0°
---- ----
300 300
75 30
195 150
315 270
+ +
+ 0
+ + (=kW)
0.7 pf 1.00 pf
(45°) lag (0°) lag
0° 0°
---- ----
60 60
15 330
255 210
135 90
+ +
+ 0
+ + (=kW)
A2 Metering Data
806559A1.CDR
0.7 pf 0.3 pf
(45°) lead (72.5°) lead
0° 0
---- ----
300 300
345 320
105 80
225 200
+ +
– –
+ +
0.7 pf 0.3 pf
(45°) lead (72.5°) lead
0° 0
---- ----
60 60
285 260
165 140
45 20
+ +
– –
+ +
GE Multilin