Hitachi Relion 670 Series Commissioning Manual page 136

Section 11
Testing functionality by secondary injection
Reference is made to the numerical values of the example, explained in the "Setting guidelines" of the
Application Manual. A test current equal to 2.5 time the base current of the generator is chosen; this
choice is related to the selected test voltage that is applied while testing the point SE and RE.
2 5 .
I
= ×
t
EQUATION14043 V1 EN-US
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
X =
RZ 1
EQUATION14044 V1 EN-US
The calculation of the test voltage, that is related to ReachZ1, is based on the impedance Z
imaginary part X
1 =
RRZ
EQUATION14045 V1 EN-US
The magnitude of the impedance Z
=
Z
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
=
, 1
t RZ
EQUATION14047 V1 EN-US
If the test voltage is lower than V
voltage is higher than V
Considering the resistances and reactances which are related to the settings (ForwardR, ForwardX) and
(ReverseR, ReverseX):
ForwardR
R =
FwdR
EQUATION14048 V1 EN-US
ForwardX
X =
FwdX
EQUATION14049 V1 EN-US
ReverseR
R =
RvsR
EQUATION14050 V1 EN-US
ReverseR
X =
RvsX
EQUATION14051 V1 EN-US
130
2 5 8367 20918 .
I A
= × =
Base
1 ForwardX
× × ZBase
100 100
and real part R
RZ1
Re achZ 1 ForwardR
× ×
ZBase
100 100
2 + 2 = 2 +
R X 0.009 0.068
RZ 1 RZ 1
0 069 20918 1435 .
I
× = × =
1
RZ t
t,RZ1
, then the test is related to the zone 2.
t,RZ1
8 19 .
× ZBase = ×
100 100
59 33 .
× ZBase =
100 100
0 29 .
× ZBase = × 0 9522 0 003
100 100
29 6 .
× ZBase = ×
100 100
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12 59 33 .
= × × 0 9522 0 .
100 100
:
RZ1
12 8 19 .
= × × 0 9522 0 0 .
100 100
is:
RZ1
2 = W
0.069
V
(or in opposition), then the test is related to the zone 1; if the test
0 9522 0 078 . = . Ω
× 0 9522 0 565 . = . Ω
. = . Ω
0 9522 0 282 . = . Ω
= .0 0 68Ω
= . 0 0 9Ω
Line distance protection REL670
1MRK506371-UUS Rev. M
(Equation 3)
(Equation 4)
that has
RZ1
(Equation 5)
(Equation 6)
(Equation 7)
(Equation 8)
(Equation 9)
(Equation 10)
(Equation 11)
Commissioning manual