ABB Relion 670 Series Commissioning Manual page 146

Section 11
Testing functionality by secondary injection
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).
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
FwdR
V V
=
t FwdZs ,
EQUATION14054 V1 EN-US
SE (R
RvsR
V V
=
,
t RvsZs
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
was calculated by using a factor 2.5 (instead of the maximum value 4) in order to reduce the
magnitude of the test voltage for the points RE and SE.
Test sets usually do not have a feature to simulate a real network during a power swing and apply
the related analog quantities at the terminal of the generator. The scope of the present test is not
a simulation of a real network. Voltages and currents are supplied in order to measure an
impedance that changes in the time and traverses the plane R-X and, in particular, the area inside
the lens characteristic. The test may be performed by applying:
• Symmetric three-phase voltage at 50 Hz. The magnitude depends on the point of the
characteristic that needs to be verified. The following three main points of the line segment
SE-RE need to be checked:
140
0 29 .
× = × 0 9522 0 003
ZBase
100 100
29 6 .
× = × 0 9522 0 282
ZBase
100 100
2 2
I R X
× = + ×
FwdZ t FwdR FwdX
2 2
I R X
× = + ×
RvsZ t RvsR RvsX
, X ):
FwdX
V
0 1 .
VT s ,
11931
× = ×
t FwdZ ,
V 13 8 .
VT p ,
, X ):
RvsX
V
0 1 .
VT s ,
5899
× = × =
,
t RvsZ
V 13 8 .
VT p ,
© Copyright 2017 ABB. All rights reserved
. = . Ω
. = . 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
86 45 . V
=
42 75 .
V
. V
= × =
.
V
= × =
Line distance protection REL670
Commissioning manual
1MRK 506 371-UUS E
(Equation 10)
(Equation 11)
(Equation 12)
(Equation 13)
(Equation 14)
(Equation 15)
t