Three-Winding Transformer Differential Protection (7Ut513 Only) - Siemens 7UT51 Instruction Manual

16
Bench Testing
6. Click Close to close the Test Results dialog box.
7. Click Close to close the Commissioning Tests
window.
8. Select "4800 Commissioning Tests Stop".
9. Select "4801 Stop the Commission Tests" and
click Yes.
Validate for Other Phases
Connect the test sources to the relay as shown in
Figure 16.4 and Figure 16.5. In each case, re-apply
the test currents and check the metering as described
in the previous procedure.
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Figure 16.4 Two Source Through Fault Testing for
Phase B-Gnd Fault on Wye Side
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Figure 16.5 Two Source Through Fault Testing for
-
Phase C Gnd Fault on Wye Side
164
16.3.3 Three Winding Transformer
-
Differential Protection
(7UT513 Only)
A 7UT513 relay, protecting three winding
transformers, can be adequately tested by considering
two windings at a time, and testing them like a
two-winding transformer. Test the reference winding
and Winding 2. Then test the reference winding and
Winding 3. Testing Winding 2 and Winding 3 is not
necessary.
To test tertiary transformer differential protection, do
the following:
1. For testing the three-winding transformer
differential protection, this function must be
configured as EXIST (Address 7816) and the
protected object (Address 7801) must be a
3WIND-TRANSF (7UT513 only). Additionally, it
must be parameterized as operative, On in
Address 1601.
2. Connect the relay as shown in Figure 16.6.
(assuming the tertiary winding is connected in a
wye configuration.)
Figure 16.6 Two Source Through
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Delta Wye 3 Winding Transformer Protection
3. Follow the same procedure as described earlier in
this section, but use the configuration of the
tertiary winding in place of the secondary winding.
7UT51 v3
-
Fault Testing for
PRIM-2330C