ABB RELION 620 Series Technical Manual page 507

1MRS757644 F
620 series
Technical Manual
Connection of current transformers
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 protection relay currents
are opposite, the CT connection type is of "Type 1". The connection examples of
"Type 1" are as shown in figures
• If the positive directions of the winding 1 and winding 2 protection relay currents
equate, the CT connection type setting parameter is "Type 2". The connection
examples of "Type 2" are as shown in figures
• The default value of the CT connection type setting is "Type 1".
GUID-A6716146-6ECD-46A2-B2AC-4408DDDB7BF6 V2 EN
Figure 250: Connection of current transformer of Type 1, example 1
Protection functions
250 and 251.
252 and 253.
Section 4
501