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5.2.5 Changing VCT rated current
In accordance with the ordering code, a rated current (either 1 or 5A) has been set previously
in the manufacture. If the user wishes to alter to other rated current, the user can do it by
using jumpers† on the VCT‡. This section illustrates the locations of the jumpers. To see the
actual workflows, jump to
Chapter Installation and setting: Changing rated current
.
†Note: The user needs optional jumpers for altering. To get the optional ones, order them
the sales representative with ‘EP-221 optional code’.
‡Note: Remind that the user needs to alter the CPU configuration. See page 1040. One of
EP-221 jumpers is required to use for the initialization.
(i) Rating jumpers
Rating jumpers are provided to determine the CT rated current (1 or 5A) on the VCT circuit.
Figure 5.2-6 shows the locations of the rating jumpers. They are identified with marks “W1”
to “W14” on the VCT circuit board. “W*” letters correspond to the AC analog input channel
numbers, which have been discussed previously.
5 A rated setting (Jumper closed)
1 A rated setting (Jumper open)
Figure 5.2-6 Rating jumpers and locations
(ii) DEP settings
All [AI1_Ch*_Rating] settings are need to have DEP in order that VCT rated current will follow
the CPU configuration. The “DEP” will be set unconditionally when the IED is initialized by
the GR-TIEMS; thereby, the user need not have [AI1_Ch*_Rating] settings respectively,
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