ABB Relion 670 Series Commissioning Manual page 145

1MRK 506 371-UUS E
I I
≤
t ovrl p
,
EQUATION14042 V1 EN-US
Reference is made to the numerical values of the example, explained in the "Setting guidelines" of
Application Manual . A test current equal to 2.5 time the base current of the generator is
the
chosen; this choice is related to the selected test voltage that is applied while testing the point SE
and RE.
2 5 .
I
= ×
t
EQUATION14043 V1 EN-US
The parameter
percent of the parameter
value of the reactance is
ReachZ
X =
RZ 1
EQUATION14044 V1 EN-US
The calculation of the test voltage, that is related to
has imaginary part X
RRZ 1 =
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
=
t RZ , 1
EQUATION14047 V1 EN-US
If the test voltage is lower than V
test voltage is higher than V
Considering the resistances and reactances which are related to the settings (
ForwardX ) and ( ReverseR , ReverseX ):
ForwardR
R =
FwdR
EQUATION14048 V1 EN-US
ForwardX
X =
FwdX
EQUATION14049 V1 EN-US
Line distance protection REL670
Commissioning manual
I
9000
rp
I 4 36000
= × = × =
ovrl
I 1
rs
2 5 8367 20918 .
I A
= × =
Base
ReachZ1 defines the boundary between zone 1 and zone 2; it is expressed in
ForwardX . If the setting of ReachZ1 = 12% , then corresponding primary
1 ForwardX
× × ZBase
100 100
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
I 0 069 20918 1435 .
× = × =
RZ 1 t
t,RZ1
8 19 .
× ZBase = ×
100 100
59 33 .
× ZBase =
100 100
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A
12 59 33 .
= × × 0 9522 0 .
100 100
ReachZ1 , is based on the impedance Z
:
RZ1
12 8 19 .
= × × 0 9522 0 0 .
100 100
is:
RZ1
= W
2
0.069
V
(or in opposition), then the test is related to the zone 1; if the
t,RZ1
, then the test is related to the zone 2.
0 9522 0 078 . = . Ω
× 0 9522 0 565 . = . Ω
Testing functionality by secondary injection
= .0 0 68Ω
= . 0 0 9Ω
ForwardR ,
Section 11
(Equation 2)
(Equation 3)
(Equation 4)
that
RZ1
(Equation 5)
(Equation 6)
(Equation 7)
(Equation 8)
(Equation 9)
139