In TR2PTDF, it is important that the accuracy limit factors F
a
of the phase current
transformers at both sides correspond with each other, that is, the burdens of the
current transformers on both sides are to be as equal as possible. If high inrush or
start currents with high DC components pass through the protected object when it
is connected to the network, special attention is required for the performance and
the burdens of the current transformers and for the settings of the function block.
4.3.2.6 CT connections and transformation ratio correction
The connections of the primary current transformers are designated as "Type 1"
and "Type 2".
• If the positive directions of the winding 1 and winding 2 IED currents are
opposite, the CT connection type setting parameter is "Type 1". The
connection examples of "Type 1" are as shown in
Figure 219 and Figure 220.
• If the positive directions of the winding 1 and winding 2 IED currents equate,
the CT connection type setting parameter is "Type 2". The connection
examples of "Type 2" are as shown in
Figure 221 and Figure 222.
• The default value of the CT connection type setting is "Type 1".
1YHT530004D05 D Section 4
Protection functions
615 series 413
Technical Manual
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