I_ANGL_B1_C1
and
I_ANGL_C1_A1
do not show the same value of +120, the polarity
of one current transformer can be wrong. For instance, if the polarity of the current
transformer measuring IL2 is wrong,
I_ANGL_A1_B1
shows -60 deg,
I_ANGL_B1_C1
shows -60 deg and
I_ANGL_C1_A1
shows +120 deg.
When the phase order and the angle values are correct, the angle values
I_ANGL_A1_A2
,
I_ANGL_B1_B2
and
I_ANGL_C1_C2
usually show ±180 deg. There can be several
reasons if the angle values are not ±180 deg. If the values are 0 deg, the value given for
CT
connection type
is probably wrong. If the angle values are something else, the value for
Clock number
can be wrong. Another reason is that the combination of
Winding 1 type
and
Winding 2 type
does not match
Clock number
. This means that the resulting connection
group is not supported.
Example
If
Winding 1 type
is set to "Y",
Winding 2 type
is set to "y" and
Clock number
is set to "Clk
num 1", the resulting connection group "Yy1" is not a supported combination. Similarly if
Winding 1 type
is set to "Y",
Winding 2 type
is set to "d" and
Clock number
is set to "Clk
num 0", the resulting connection group "Yd0" is not a supported combination. All the non-
supported combinations of
Winding 1 type
,
Winding 2 type
and
Clock number
settings
result in the default connection group compensation that is "Yy0".
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 protection relay currents are
opposite, the
CT connection type
setting parameter is "Type 1". The connection
examples of "Type 1" are as shown in
•
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
•
The default value of the
CT connection type
setting is "Type 1".
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
527
Technical Manual
Summary of Contents for Relion 615 series
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