Phase-ground short circuit:
V
ref_A
= V
A
I
dir_A
= I
A
V
ref_B
= V
B
I
dir_B
= I
B
V
ref_C
= V
C
I
dirC
= I
C
V
ref
I
dir
ANSI09000636-1-en.vsd
1
2
2
3
4
ANSI09000636 V1 EN
Figure 96:
Directional characteristic of the phase overcurrent protection
1. RCA = Relay characteristic angle 55°
2. ROA = Relay operating angle 80°
3. Reverse
4. Forward
If no blockings are given, the pickup signals will start the timers of the step. The time
characteristic for step 1 and 4 can be chosen as definite time delay or inverse time
characteristic. Step 2 and 3 are always definite time delayed. A wide range of standardized
inverse time characteristics is available. The possibilities for inverse time characteristics
are described in section
"Inverse time characteristics"
1MRK 506 335-UUS A
Section 7
Current protection
211
Technical manual
Содержание REL650 series
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