7.10
SEL-734 Meter
Instruction Manual
Date Code 20090730
Time-Synchronized Measurements
Power Flow Analysis
Use
to calculate the generation supplied from Substation S and
Substation R, plus the load at Substation T shown in
.
Equation 7.2
The complex power generation supplied by Substation S is:
Equation 7.3
The complex power generation supplied by Substation R is:
Equation 7.4
The load at Substation T supplied by Substation S is:
Equation 7.5
The load at Substation T supplied by Substation R is:
Equation 7.6
The total load at Substation T is:
Equation 7.7
Meter at Substation T Looking Towards Substation R
V
AT–R
295.603 kV
∠
1.6
I
AT–R
234.036 A
∠
135.8
V
BT–R
295.603 kV
∠
238.4
I
BT–R
234.036 A
∠
15.8
V
CT–R
295.603 kV
∠
118.4
I
CT–R
234.036 A
∠
104.2
where:
S
3ø
= Three-phase complex power (MVA)
P
3ø
= Three-phase real power (MW)
Q
3ø
= Three-phase imaginary power (MVAR)
V
pp
= Phase-to-phase voltage
V
p
= Phase-to-neutral voltage
I
*
L
= Complex conjugate of the line current
Table 7.8
Meter Voltage and Current Measurement
(Sheet 2 of 2)
Voltage
Current
S
3ø
P
3ø
jQ
3ø
+
=
3
V
pp
I
*
L
• •
=
3
V
p
I
*
L
• •
=
S
S
3
288.675 kV 0
°
∠
•
(
)
238.995 A
41.9
–
°
∠
(
)
•
=
154.1 MW – j138.2 MVAR
=
S
R
3
303.109 kV
0.2
–
°
∠
•
(
)
234.036 A 44.2
°
∠
(
)
•
=
152.6 MW + j148.3 MVAR
=
S
T
S
–
3
295.603 kV
1.6
–
°
∠
•
(
)
238.995 A 135.8
°
∠
(
)
•
=
153.7 MW + j145.9 MVAR
=
S
T
R
–
3
295.603 kV
1.6
–
°
∠
•
(
)
234.036 A
135.8
–
°
∠
(
)
•
=
152.8 MW – j140.5 MVAR
–
=
S
T
S
T
S
–
S
T
R
–
+
=
306.5 MW
–
j5.4 MVAR
+
=
Summary of Contents for SEL-734
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