Hitachi Relion RES670 Commissioning Manual page 98

Section 11
Testing functionality by secondary injection
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
and the voltages that are related to them:
V Z
=
t FwdZ ,
EQUATION14052 V1 EN-US
V Z
=
,
t RvsZ
EQUATION14053 V1 EN-US
The previous calculations are in primary values. They are transferred to secondary values to perform
injections by a test set. Primary values are transferred to secondary values by taking into account the CT
ratio and the VT ratio (respectively 9000/1 A and 13.8/0.1 kV in the example).
92
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
2 2
I R X
× = + ×
FwdZ t FwdR FwdX
2 2
I R X
× = + ×
RvsZ t RvsR RvsX
© 2017 - 2022 Hitachi Energy. All rights reserved
:
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
2 2
I 0 078 . 0 565 . 20918 0 570 0 20918 11931
= + ×
t
2 2
0 003 . 0 282 . 20918 0 282 2 20918 5899
I
= + ×
t
1MRK 511 409-UUS Rev. K
= . 0 0 9Ω
.
= × =
.
= × =
Phasor measurement unit RES670
that has
RZ1
(Equation 5)
(Equation 6)
(Equation 7)
(Equation 8)
(Equation 9)
(Equation 10)
(Equation 11)
V
(Equation 12)
V
(Equation 13)
Commissioning manual