op
p
Measured
a
t
k
b
I
c
IMaxAddDelay
= ×
+
-
æ
ö
ç
÷
ç
÷
ç
÷
æ
ö
ç
÷
ç
÷
ç
÷
è
ø
è
ø
EQUATION1418 V1 EN-US
(Equation 27)
where:
t
op
is operate time
k
is time multiplier of the inverse time curve
a, b, c, p are settings that will model the inverse time characteristic
6.3.3.6
Settings examples
M12541-349 v3
M12941-3 v6
Setting example for line with power transformer in the protected zone
In this section it is described how setting parameters can be chosen for a line with a power
transformer in the protected zone. The line is shown in Figure
, and the circuit impedances
. The protection zone is limited by the current transformers CT1, CT2
and CT3. The terminals are situated in two separate substations, Substation 1 and Substation
2. The circuit is protected by two protection terminals, Protection Terminal 1, and Protection
Terminal 2. Except for a minor distortion of data due to the communication between the two
protection terminals, the protection terminals process the same data. Both protection
terminals are masters. If at least one of them signalizes an internal fault, the protected circuit
is disconnected. Settings of Protection Terminal 1 and Protection Terminal 2 must be equal,
except for a few parameters, which can be pointed out.
IEC05000534 V1 EN-US
Figure 62: Line differential protection with power transformer in protected zone
1MRK 505 343-UEN B
Section 6
Differential protection
133
Application manual
Содержание Relion 670 series
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