EQUATION1753-ANSI V1 EN (Equation 228)
Where:
V is the minimum phase-to-phase voltage in kV
S is the maximum apparent power in MVA.
The load angle LdAngle can be derived according to equation 229:
max
cos
max
P
LdAngle a
S
æ ö
=
ç ÷
è ø
EQUATION1623-ANSI V1 EN (Equation 229)
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 230:
cos( )RLd ZLoad LdAngle= ×
EQUATION1624-ANSI V1 EN (Equation 230)
The setting of RLd and LdAngle is by default set to 80 ohm/phase and 20 degrees. Those
values must be adapted to the specific application.
8.9 Distance protection zone, quadrilateral characteristic,
separate settings ZMRPDIS (21), ZMRAPDIS (21) and
ZDRDIR (21D)
Section 8 1MRK 506 369-UUS -
Impedance protection
308 Line distance protection REL670 2.2 ANSI
Application manual
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