Operation Principle - ABB REL650 series Technical Manual

Section 6
Impedance protection
Name Values (Range)
LEModeZ4 Disabled
Enabled
BlndModeZ4 Disabled
Enabled
LEModeZ5 Disabled
Enabled
BlndModeZ5 Disabled
Enabled
Table 28: ZQMPDIS (21) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
6.1.6
6.1.6.1
98
Unit Step
- -
- -
- -
- -
Unit Step
- 1

Operation principle

General
Five zone distance protection, quadrilateral and mho characteristic ZQMPDIS (21)
function is designed to operate in the following characteristic modes for separate phase-
to-ground and phase-to-phase loops:
• Mho characteristic
• Quadrilateral characteristic
• Combined Mho and Quadrilateral characteristic
The overall functionality is defined in the logic diagram as shown in figure 30. There is a
pre-calculation block where zero sequence compensated current calculation is done.
These calculated values, along with the phase voltage and current values will be given to
each zone.
Default Description
Disabled Enable load enchroachment mode Zone 4
Disabled Blinder mode Zone 4
Disabled Enable load enchroachment mode Zone 5
Disabled Blinder mode Zone 5
Default Description
1 Selection of one of the Global Base Value
groups
1MRK 506 335-UUS A
Technical manual