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X
R
-ArgDir
ArgNegRes
Zset reach point
-Zs
en06000416.vsd
IEC06000416 V1 EN
Figure 79:
Setting angles for discrimination of forward fault
The reverse directional characteristic is equal to the forward characteristic rotated by
180 degrees.
The code built up for release of the measuring fault loops is as follows: STDIRCND
= L1N*1 + L2N*2 + L3N*4 + L1L2*8 + L2L3*16 + L3L1*32
Example: If only L1Nstart, the value is 1, if start in L1N and L3N are detected, the
value is 1+4=5.
The polarizing voltage is available as long as the positive-sequence voltage exceeds
5% of the set base voltage
UBase
, thus the directional element can use it for all
unsymmetrical faults including close-in faults.
For close-in three-phase faults, the U1
L1M
memory voltage, based on the same
positive sequence voltage, ensures correct directional discrimination.
The memory voltage is used for 100ms or until the positive sequence voltage is
restored. After 100ms, the following occurs:
•
If the current is still above the set value of the minimum operating current the
condition seals in.
•
If the fault has caused tripping, the trip continues.
•
If the fault was detected in the reverse direction, the measuring element in
the reverse direction remains in operation.
•
If the current decreases below the minimum operate value, no directional
indications will be given until the positive sequence voltage exceeds 10% of its
rated value.
Section 7
1MRK502052-UEN B
Impedance protection
202
Technical manual
Содержание Relion REG670
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