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17.6 CT Detect Protection
When using a wired CT for the Grid current reading,
connected. This is important when using the Grid Limit (or "Load Curtailment") function in the
required by some distribution companies.
"G100" is a UK requirement which describes the technical requirements for export limiting schemes. It does
not apply directly to "import limitation" or "load curtailment" schemes but the general requirements are
referred to by UK Distribution Network Operators in this context.
Normally the CT Detect setting should be turned ON for wired Grid CTs
17.7 CT Groups
CTs can be put in groups so that their readings are netted (combined). For example, you might want to monitor
two solar PV systems and see the total generation on the display. Use Group in the CT Config menu to set which
group the CT should be in.
Note:
Different CT Types cannot be in the same group, the group names make this clear.
Only the first 4 groups can be used for current limiting, see Group Limits below.
17.8 Group Limits
Current limits can be set for certain CT Groups. When a Group Limit is set the
will limit the power they draw to keep within the set limit.
Group limits should be set only on the master device.
It is possible to use more than one group limit type (e.g. IL1 with MN1, so that there are two conditions for
limiting). Some examples of how to set up the group limits are described in the table below.
Group Limit Example
Limit current drawn by two
devices that are on
zappi
the same 32A supply.
Limit current drawn by a
device that is fed
zappi
from a 32A supply which is
also feeding another
appliance (e.g. a tumble
dryer).
Limit current drawn by two
devices that are in a
zappi
garage which is fed from a
40A supply. A washing
machine and dryer are also
in the garage.
Page 24 of 41
zappi
Additional CT Installed
None; only the internal CTs are
used.
One CT is clipped around Live of the
32A supply and wired to CT2 of the
.
zappi
One CT is clipped around Live of the
40A supply to the garage and wired
to CT2 of one of the
zappi
Note: The other
zappi
need to have a CT connected, but it
will still need to have a CT input
configured to be in the same Monitor
group.
can also monitor the CT to make sure that it is still
myenergi
CT Config (all devices)
CTINT
Type: Internal
Group: IL1
Group Limit: 32A
CT2
Type: Monitor
Group: MN1
Group Limit: 32A
CT2
Type: Monitor
units.
Group: MN1
Group Limit: 40A
does not
zappi
and is a
devices in the group
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