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2.4.2 Settings against CT saturation
The operation of the counter measure is available when setting coordination is made for the
three settings, as tabulated in Table 2.4-1.
Table 2.4-1 Setting combination for operating the counter measure for CT saturation
Counter measure
Operation
1
Note: For more information, see Chapter
Relay application: Transmission control
function
.
2
Note: For more information, see Chapter
Technical description: Settings for residual
voltage, CT polarity, and busbar arrangements
.
(i) When Wide is applied in 1CB (Setting No.6)
When the communication width is Wide (N=3) and the DIFL function operates for 1CB
arrangement, the user can use the counter measure when Block is set for scheme switch [DIFL-
CTSat]. Consequently, the counter measure is triggered upon occurrence of the CT saturation;
then issuing a trip signal is blocked.
(ii) When Normal is applied in 1CB (Settings No. 1 and 2)
When Normal (N=1) is used for the 1CB arrangement, the internal DIFL software is not
available for the counter measure for the CT saturation. That is, the operation of the counter
measure is not dependent upon the setting [DIFL-CTSat]. Keep in mind that the user should
arrange that the TFC function† should be operated.
(iii) Counter measure for 1.5CB (Setting No. 8)
If the DIFL function is entailed to operate in 1.5CB arrangement, the relay computation is
only available when the setting [CH*_COM_WIDTH]=Wide (N=3). Analog input quantities,
obtained at center CT and busbar CT, will be transferred by the extended frames in N=3.
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