ABB Relion 650 Series Commissioning Manual page 82

Section 9
Testing functionality by secondary injection
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
=
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:
•
•
•
The phase angle of the test voltages is equal to:
• arctan (ForwardX/ForwardR) for tests in the quadrant 1 and 2 of the R-X plane
• arctan (ReverseX/ReverseR) -180° for tests in the quadrant 3 and 4 of the R-X plane
• Symmetric three-phase current, where the current is the summation of two currents that have
the same magnitude, but different frequencies.
76
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 ,
V 11931
× = ×
t FwdZ ,
V 13 8 .
VT p ,
, X ):
RvsX
V 0 1 .
VT s ,
5899
× = ×
t RvsZ ,
13 8 .
V
,
VT p
the point RE (R , X
FwdR
a point which is related to the parameter ReachZ1 (boundary between zone 1 and zone 2)
the point SE (R , X
RvsR
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2 2
I 0 078 . 0 565 . 20918 0 570 0 20918 11931
× = + ×
t
2 2
I 0 003 . 0 282 . 20918 0 282 2 20918 5899
× = + ×
t
86 45 . V
=
42 75 .
V
=
)
FwdX
)
RvsX
1MRK 505 395-UEN Rev. G
. V
= × =
. V
= × =
Line differential protection RED650
Commissioning manual
(Equation 12)
(Equation 13)
(Equation 14)
(Equation 15)
t