- 383 -
where, “a” and “a2” are represented as
‡Note: When we suppose that all the self-impedance and all the mutual-impedance are
identical (Z
aa
=Z
bb
=Z
cc
and Z
ab
=Z
bc
=Z
ca
), we can see that both Z
12
and Z
10
are
represented as zero when Z
10
is identical to Z
GH
.
Note: To run the FL, user should set either the symmetrical components (Z
11
, Z
12
and
Z
10
) or the self-impedance (Z
aa
, Z
bb
and Z
cc
) and mutual-impedance (Z
ab
, Z
bc
and
Z
ca
). For example, the value of Z
11
is placed for setting [FL_1R1] and [FL_1X1]
when symmetrical setting is selected. If symmetrical setting is not selected, user
should set the value of the Z
aa
for setting [FL_1Raa] and [FL_1Xaa]. For more
information, see section 2.32.6(iii).
(ii) Data recording trigger and calculation trigger
The calculation is stated by signals; and following protection functions provide the trigger
signals:
(a) Current differential protection (DIFL)
(b) External protection
With regard to the trigger signal of the external protection function, user can program
the trigger signal for recording data and calculation by using Element IDs (PLC connection
points), as shown in Table 2.32-2.
Table 2.32-2 Element IDs of recording data and calculation
Trigger for data recording
Note: Element IDs are also listed in section 0.
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