ABB Relion 670 series, Техническое руководство

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Figure 71 presents an outline of the different measuring loops for up to five, impedance-
measuring zones. There are 3 to 5 zones depending on product type and variant.
A-G B-G C-G
A-G B-G C-G
A-G B-G C-G
A-G B-G C-G
A- B B-C C-A
A- B B-C C-A
A- B B-C -A
A- B B-C C-A
A-G B-G C-G A- B B-C C-A
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
C
Zone 6
A-G B-G C-G A- B
B-C
C-A
ANSI05000458-2-en.vsd
ANSI05000458 V2 EN-US
Figure 71: The different measuring loops at phase-to-ground fault and phase-to-phase
fault.
The use of full scheme technique gives faster operation time compared to switched schemes
which mostly uses a pickup of an overreaching element to select correct voltages and current
depending on fault type. Each distance protection zone performs like one independent distance
protection IED with six measuring elements.
7.1.7.2 Impedance characteristic
M16923-100 v7
The distance measuring zone includes six impedance measuring loops; three intended for phase-
to-ground faults, and three intended for phase-to-phase as well as, three-phase faults.
The distance measuring zone will essentially operate according to the non-directional impedance
characteristics presented in figure 72 and figure 73 . The phase-to-ground characteristic is
illustrated with the full loop reach while the phase-to-phase characteristic presents the per phase
reach.
Section 7 1MRK 502 066-UUS B
Impedance protection
184
Technical manual