Distance Protection Zone, Quadrilateral Characteristic, Separate Settings Zmrpdis, Zmrapdis And Zdrdir - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
8.9
Line distance protection REL670 2.2 IEC
Application manual
U
min
Z = --------------------- -
load
×
3 I
max
EQUATION574 V1 EN-US
2
U
Z = ------ -
loadmin
S
EQUATION571 V1 EN-US
Where:
U is the minimum phase-to-phase voltage in kV
S is the maximum apparent power in MVA.
The load angle ArgLd can be derived according to equation 226:
æ ö
P max
=
ArgLd a cos ç ÷
è ø
S max
EQUATION1623 V1 EN-US
where:
Pmax is the maximal active power transfer during emergency conditions and
Smax is the maximal apparent power transfer during emergency conditions.
The RLd can be calculated according to equation 227:
= ×
RLd ZLoad cos( ArgLd )
EQUATION1624 V1 EN-US
The setting of RLd and ArgLd is by default set to 80 ohm/phase and 20 degrees.
Those values must be adapted to the specific application.
Distance protection zone, quadrilateral
characteristic, separate settings ZMRPDIS,
ZMRAPDIS and ZDRDIR
Section 8
Impedance protection
(Equation 224)
(Equation 225)
(Equation 226)
(Equation 227)
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