ABB REG670 Commissioning Manual page 157

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Testing functionality by secondary injection
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
and the voltages that are related to them:
2
V Z I R
= × =
t FwdZ , FwdZ t FwdR
EQUATION14052 V1 EN-US
2
V Z I R
= × =
t RvsZ , RvsZ t RvsR
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).
The magnitude of the secondary voltages, that are related to the points RE and SE
of the R-X plane, needs to be checked.
RE (R , X ):
FwdR FwdX
V
VT s ,
V V 11931
= × =
t FwdZs , t FwdZ ,
V
VT p ,
EQUATION14054 V1 EN-US
SE (R , X ):
RvsR RvsX
V
VT s ,
V V 5899
= × =
t RvsZs , t RvsZ ,
V
VT p ,
EQUATION14055 V1 EN-US
The tests, which are described in this section, may require voltages that have
magnitude equal to 110% of the previous values. The continuous permissive
overload voltage of the protection voltage channels of the TRM module is 420 V;
so the previous voltages may be applied to the analog channels of the IED
continuously. Limitations may be related to the available test set; the current I
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
2 2
X I 0 078 . 0 565
+ × = +
FwdX t
2 2
X I 0 003 . 0 282
+ × = +
RvsX t
0 1 .
86 45 . V
× =
13 8 .
0 1 .
42 75 . V
× =
13 8 .
Section 13
Ω
2
. 20918 0 570 0 20918 11931 .
× = ×
2
. 20918 0 282 2 20918 5899 .
× = ×
(Equation 8)
(Equation 9)
(Equation 10)
(Equation 11)
V
=
(Equation 12)
V
=
(Equation 13)
(Equation 14)
(Equation 15)
was
t
151