ABB Relion 670 series - Functionality

7.15 Under impedance protection for generators and
transformers ZGVPDIS
GUID-1A3A4890-5CFA-417B-BDA4-EA001502AA60 v2
7.15.1 Identification
GUID-752C21F4-972E-4E97-AB15-075FF720527F v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/
IEEEidentificatio
n
Under impedance function for
generators and transformers
ZGVPDIS
S00346 V1 EN-US
21G
7.15.2 Functionality
GUID-5D0E6F04-8B60-4F12-8DA6-7043BE09A3CC v5
The under impedance protection is a three zone full scheme impedance protection using offset
mho characteristics for detecting faults in the generator, generator-transformer and transmission
system. The three zones have fully independent measuring loops and settings. The functionality
also comprises an under voltage seal-in feature to ensure issuing of a trip even if the current
transformer goes into saturation and, in addition, the positive-sequence-based load
encroachment feature for the second and the third impedance zone. Built-in compensation for the
step-up transformer vector group connection is available.
7.15.3 Function block
GUID-8FA2E41C-1299-40F1-82E7-50EB7E0BE442 v3
ZGVPDIS (21)
I3P*
V3P*
BLOCK
BLKZ
BLKUV
TRIP
TRZ1
TRZ2
TRZ3
27 Trip
PICKUP
PU_Z1
PU_Z2
PU_Z3
27 PU
ANSI14000063-1-en.vsd
ANSI14000063 V1 EN-US
Figure 234: ZGVPDIS (21) function block
1MRK 502 066-UUS B Section 7
Impedance protection
433
Technical manual