ABB REG670 Commissioning Manual page 168

Section 13
Testing functionality by secondary injection
162
The parameter ReachZ1 defines the boundary between zone 1 and zone 2; it is
expressed in percent of the parameter ForwardX. If the setting of ReachZ1 = 12%, then
corresponding primary value of the reactance is
ReachZ 1 ForwardX
X
= ×
RZ 1
100 100
EQUATION14044 V1 EN-US
The calculation of the test voltage, that is related to ReachZ1, is based on the
impedance Z that has imaginary part X
RZ1
Re achZ 1 ForwardR
RRZ 1
= ×
100 100
EQUATION14045 V1 EN-US
The magnitude of the impedance Z
= + =
2 2
Z R X 0.009
RZ 1 RZ 1 RZ 1
EQUATION14046 V1 EN-US
Hence the reference voltage of the test of the boundary between zone 1 and zone 2 is
V Z I 0 069 20918 1435 .
= × = ×
t RZ , 1 RZ 1 t
EQUATION14047 V1 EN-US
If the test voltage is lower than V
zone 1; if the test voltage is higher than V
Considering the resistances and reactances which are related to the settings (ForwardR,
ForwardX) and (ReverseR, ReverseX):
ForwardR
R ZBase
= ×
FwdR
100
EQUATION14048 V1 EN-US
ForwardX
X ZBase
= ×
FwdX
100
EQUATION14049 V1 EN-US
ReverseR
R ZBase
= × =
RvsR
100
EQUATION14050 V1 EN-US
ReverseR
X ZBase
= ×
RvsX
100
EQUATION14051 V1 EN-US
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
12 59 33 .
ZBase
× = × ×
100 100
and real part R
RZ1
12 8 19 .
ZBase
× = × ×
100 100
is:
RZ1
+ = W
2 2
0.068 0.069
V
=
(or in opposition), then the test is related to the
t,RZ1
, then the test is related to the zone 2.
t,RZ1
8 19 .
0 9522 0 078 . .
= × = Ω
100
59 33 .
0 9522 0 565 . .
= × =
100
0 29 .
0 9522 0 003 . .
× = Ω
100
29 6 .
0 9522 0 282 . .
= × = Ω
100
1MRK 502 073-UUS A
0 9522 0 . .0 0 68Ω
=
:
RZ1
0 9522 0 0 . . 0 0 9Ω
=
Ω
Commissioning manual
(Equation 4)
(Equation 5)
(Equation 6)
(Equation 7)
(Equation 8)
(Equation 9)
(Equation 10)
(Equation 11)