ABB RELION REX640 Technical Manual page 706
Protection and control
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Also See for RELION REX640:
- Technical manual (1760 pages) ,
- Operation manual (164 pages) ,
- Engineering manual (156 pages)
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Protection functions
When injecting the currents in the high voltage winding, the angle values
I_ANGL_A1_B1, I_ANGL_B1_C1, I_ANGL_C1_A1, I_ANGL_A2_B2, I_ANGL_B2_C2
and I_ANGL_C2_A2 have to show +120 deg. Otherwise the phase order can be
wrong or the polarity of a current transformer differs from the polarities of the
other current transformers on the same side.
If the angle values I_ANGL_A1_B1, I_ANGL_B1_C1 and I_ANGL_C1_A1 show -120
deg, the phase order is wrong on the high voltage side. If the angle values
I_ANGL_A2_B2, I_ANGL_B2_C2 and I_ANGL_C2_A2 show -120 deg, the phase order
is wrong on the low voltage side. If the angle values I_ANGL_A1_B1, 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
something else, the value for
combination of
This means that the resulting connection group is not supported.
Example
Winding 1 type is set to "Y", Winding 2 type is set to "y" and Clock number
If
is set to "Clk num 1", the resulting connection group "Yy1" is not a supported
combination. Similarly if
"d" and
"Yd0" is not a supported combination. All the non-supported combinations
Winding 1 type , Winding 2 type and Clock number settings result in the
of
default connection group compensation that is "Yy0".
4.3.2.7
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
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
examples of "Type 2" are as shown in
• The default value of the
706
CT connection type is probably wrong. If the angle values are
Winding 1 type and Winding 2 type does not match Clock number .
Winding 1 type is set to "Y", Winding 2 type is set to
Clock number is set to "Clk num 0", the resulting connection group
CT connection type setting parameter is "Type 2". The connection
CT connection type setting is "Type 1".
Clock number can be wrong. Another reason is that the
CT connection type setting parameter is "Type 1". The
Figure 403
1MRS759142 F
Figure 401
Figure 402
and
Figure 404
and
.
Technical Manual
.
REX640
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