Metering; Parallel Redundancy Protocol (Prp); Metering Conventions - GE B30 UR Series Instruction Manual

6 ACTUAL VALUES

6.3METERING

The Parallel Redundancy Protocol (PRP) defines a redundancy protocol for high availability in substation automation net-
works.

PATH: ACTUAL VALUES STATUS
 PRP

MESSAGE
MESSAGE
MESSAGE
MESSAGE
is a counter for total messages received (either from DANPs or from SANs) on Port A.
TOTAL RECEIVED PORT A
is a counter for total messages received (either from DANPs or from SANs) on Port B.
TOTAL RECEIVED PORT B
is a counter for total messages received with an error (bad port code, frame length too short).
TOTAL ERRORS
is a counter for total messages received with an error on Port A (PRP frame, but port received through
MISMATCHES PORT A
and LAN ID in the frame do not match).
is a counter for total messages received with an error on Port B (PRP frame, but port received through
MISMATCHES PORT B
and LAN ID in the frame do not match).
a) UR CONVENTION FOR MEASURING PHASE ANGLES
All phasors calculated by UR-series relays and used for protection, control and metering functions are rotating phasors that
maintain the correct phase angle relationships with each other at all times.
For display and oscillography purposes, all phasor angles in a given relay are referred to an AC input channel pre-selected
by the 
SETTINGS SYSTEM SETUP
defines a particular AC signal source to be used as the reference.
The relay will first determine if any "Phase VT" bank is indicated in the source. If it is, voltage channel VA of that bank is
used as the angle reference. Otherwise, the relay determines if any "Aux VT" bank is indicated; if it is, the auxiliary voltage
channel of that bank is used as the angle reference. If neither of the two conditions is satisfied, then two more steps of this
hierarchical procedure to determine the reference signal include "Phase CT" bank and "Ground CT" bank.
If the AC signal pre-selected by the relay upon configuration is not measurable, the phase angles are not referenced. The
phase angles are assigned as positive in the leading direction, and are presented as negative in the lagging direction, to
more closely align with power system metering conventions. This is illustrated below.
GE Multilin

PRP
Total Rx Port A:
Total Rx Port B:
Total Errors:
Mismatches Port A:
Mismatches Port B:
 
POWER SYSTEM
B30 Bus Differential System

6.3.1 PARALLEL REDUNDANCY PROTOCOL (PRP)

Range: 0 to 4G, blank if PRP disabled
Range: 0 to 4G, blank if PRP disabled
Range: 0 to 4G, blank if PRP disabled
Range: 0 to 4G, blank if PRP disabled
Range: 0 to 4G, blank if PRP disabled

6.3.2 METERING CONVENTIONS

FREQUENCY AND PHASE REFERENCE
6.3 METERING
6
setting. This setting
6-11