Operation Principle; Full Scheme Measurement; Impedance Characteristic - ABB RET650 Technical Manual

1MRK 504 135-UEN A
Name Values (Range)
OpModeZ3
Z3Fwd
Z3Rev
tZ3
Table 58: ZGCPDIS Group settings (advanced)
Name Values (Range)
LoadEnchModeZ3
Table 59: ZGCPDIS Non group settings (basic)
Name Values (Range)
GlobalBaseSel
7.2.6
7.2.6.1
7.2.6.2
Technical manual
Unit
Disable-Zone -
Enable-Zone
0.005 - 3000.000 ohm/p
0.005 - 3000.000 ohm/p
0.000 - 60.000 s
Unit
Off -
On
Unit
1 - 6 -

Operation principle

Full scheme measurement

The execution of the different fault loops for phase-to-phase faults are executed in
parallel. The use of full scheme technique gives faster operation time compared to the
switched schemes that uses a start element to select correct voltage and current
depending on the fault type.

Impedance characteristic

The distance function consists of three zones. Each zone is self polarized offset mho
characteristics with reverse offset. The operating characteristic is in accordance to
figure 56.
Step Default
- Disable-Zone
0.001 30.000
0.001 30.000
0.001 1.000
Step Default
- Off
Step Default
1 1
Section 7
Impedance protection
Description
Operation mode of Zone 3
Forward reach setting for Zone 3
Reverse reach setting for Zone 3
Time delay to operate for Zone 3
Description
Enable load enchroachment mode Zone 3
Description
Selection of one of the Global Base Value
groups
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