GE b30 User Manual

6-12 B30 Bus Differential System GE Multilin
6.3 METERING 6 ACTUAL VALUES
6
Figure 6–1: UR PHASE ANGLE MEASUREMENT CONVENTION
b) UR CONVENTION FOR MEASURING SYMMETRICAL COMPONENTS
The UR-series of relays calculate voltage symmetrical components for the power system phase A line-to-neutral voltage,
and symmetrical components of the currents for the power system phase A current. Owing to the above definition, phase
angle relations between the symmetrical currents and voltages stay the same irrespective of the connection of instrument
transformers. This is important for setting directional protection elements that use symmetrical voltages.
For display and oscillography purposes the phase angles of symmetrical components are referenced to a common refer-
ence as described in the previous sub-section.
WYE-CONNECTED INSTRUMENT TRANSFORMERS:
The above equations apply to currents as well.
• ABC phase rotation: • ACB phase rotation:
827845A1.CDR
UR phase angle
reference
0
o
-45
o
-90
o
-135
o
-270
o
-225
o
-180
o
-315
o
positive
angle
direction
V_0
1
3
---
V
AG
V
BG
V
CG
++()=
V_1
1
3
---
V
AG
aV
BG
a
2
V
CG
++()=
V_2
1
3
---
V
AG
a
2
V
BG
aV
CG
++()=
V_0
1
3
---
V
AG
V
BG
V
CG
++()=
V_1
1
3
---
V
AG
a
2
V
BG
aV
CG
++()=
V_2
1
3
---
V
AG
aV
BG
a
2
V
CG
++()=

GE b30 Specifications

General

Brand	GE
Model	b30
Category	Relays
Language	English