ABB RET670 Commissioning Manual page 115
Relion 670 series, transformer protection
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Also See for RET670:
- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
1.
Set Operation to On.
2.
Connect the test set for three phase current injection to the appropriate IED
terminals.
3.
Inject symmetrical phase currents equal to half the rated current
4.
Increase the injected current in phase L1 slowly by more than the set ICV>.
No signal shall be activated.
5.
Decrease the injected current in phase L1 to half the rated current.
6.
Increase the injected current in phase L1 in a step by more than the set ICV>.
Start shall be activated.
Undervoltage criteria
Procedure
1.
Connect the test set for three phase current injection and three phase voltage
to the appropriate IED terminals.
2.
Inject symmetrical phase voltages equal to the rated voltage.
3.
Decrease the injected voltage in phase L1 and note the operated value (start
value) of the function.
4.
Increase the voltage slowly and note the reset value.
5.
Connect a trip output contact to a timer.
6.
Reduce the injected voltage stepwise to 90 % of the operate level, and check
the time delay.
7.
Repeat points 3– 6 for phases L2 and L3.
8.
Inject symmetrical phase voltages equal to the rated voltage.
9.
Decrease the injected phase-phase voltage L1-L2 and note the operated value
(start value) of the function.
10. Increase the voltage slowly and note the reset value.
11. Connect a trip output contact to a timer.
12. Reduce the injected voltage stepwise to 90 % of the operate level, and check
the time delay.
13. Repeat points 9 – 12 for phases L2-L3 and L3-L1.
Zero sequence overcurrent criteria
Procedure
1.
Connect the test set for three phase voltage injection (L1, L2, L3) or residual
voltage injection (N) to the appropriate IED terminals. This is dependent on
how the IED is fed from the CT .
2.
Increase the injected zero sequence current and note the operate value (start
value) of the studied step of the function.
3.
Decrease the current slowly and note the reset value.
4.
Connect a trip output contact to a timer.
5.
Set the injected current to 200 % of the operate level of the tested stage,
switch on the current and check the time delay.
Section 11
GUID-57075848-249D-4F53-AB4D-A0DF2A04AC7C v2
GUID-27C0852A-008D-4107-8346-AB6A85043B7E v2
109
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