Section 6 Impedance Protection; Underimpedance Protection For Generators And Transformers Zgpdis; Identification; Functionality - ABB REG650 Technical Manual

1MRK 502 034-UEN -
Section 6
6.1
6.1.1
6.1.2
Technical Manual
Impedance protection
Underimpedance protection for generators and
transformers ZGPDIS

Identification

Function description
Underimpedance protection for
generators and transformers

Functionality

The underimpedance protection for generators and transformers ZGPDIS, has the
offset mho characteristic as a three zone back-up protection for detection of short
circuits in transformers and generators. The three zones have independent
measuring and settings that gives high flexibility for all types of applications.
Load encroachment characteristic is available for third zone as shown in figure 58.
jX
Operation area Operation area
Operation area
No operation area No operation area
IEC07000117 V1 EN
Figure 58: Load encroachment influence on the offset mho characteristic
IEC 61850
identification
ZGPDIS
R
en07000117.vsd
Section 6
Impedance protection
IEC 60617 ANSI/IEEE C37.2
identification device number
21G
117