Hitachi Relion 670 Series Commissioning Manual page 137

1MRK506371-UUS Rev. M
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
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
Line distance protection REL670
Commissioning manual
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 ,
13 8 .
V
VT p ,
, X ):
RvsX
V
0 1 .
VT s ,
5899
× = × =
,
t RvsZ
V 13 8 .
VT p ,
the point RE (R , X
FwdR FwdX
a point which is related to the parameter ReachZ1 (boundary between zone 1 and zone 2)
the point SE (R , X
RvsR RvsX
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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
)
)
Testing functionality by secondary injection
. V
= × =
.
V
= × =
was calculated by using a
t
Section 11
(Equation 12)
(Equation 13)
(Equation 14)
(Equation 15)
131