ABB RET670 Commissioning Manual page 283

1MRK 504 165-UUS -
Transformer protection RET670 2.2 ANSI
Commissioning manual
6.1. Test the set timing defined byRatedOperCurr, RatedFltCurr, OperNoRated,
OperNoFault, DirCoef, CBLifeAlmLevel.
6.2. Vary the phase current in the selected phase from below rated operated current,
RatedOperCurr to above rated fault current, RatedFltCurr of a breaker.
6.3. The remaining life of CB output CBLIFEPH is estimated when the CB is
changed from closed to open position. Check that the output CBLIFEPH is
decreased with a value that corresponds to the injected current.
6.4. CBLIFEAL is activated as soon as CBLIFEPH is below the set
CBLifeAlmLevel value.
7. Test of accumulated energy
7.1. Test the actual set values defined by AccSelCal to Aux Contact, ContTrCorr
and AlmAccCurrPwr.
7.2. Inject phase current in the selected phase such that its value is greater than set
AccStopCurr value.
7.3. When the breaker goes to open position, accumulated energy IPOWPH is
calculated. The calculated value can be seen on the output IPOWPH.
7.4. Alarm signal IPOWALPH appears when IPOWPH is greater than set
AlmAccCurrPwr value.
7.5. Lockout signal IPOWLOPH appears if IPOWPH exceeds further to the threshold
value LOAccCurrPwr.
7.6. Calculation of accumulated energy IPOWPH is stopped when injected current
is lower than set AccStopCurr value.
8. Test of CB operation cycles
8.1. Test the actual set values defined by OperAlmLevel and OperLOLevel.
8.2. The operation counter, NOOPER is updated for every close-open sequence of
the breaker by changing the position of auxiliary contacts POSCLOSE and
POSOPEN.
8.3. OPERALM is activated when NOOPER value exceeds the set OperAlmLevel
value. The actual value can be read on the output NOOPER.
8.4. OPERLO is activated when NOOPER value exceeds the set OperLOLevel
value.
9. Test of CB spring charge monitoring
9.1. Test the actual set value defined by SpChAlmTime.
9.2. Enable SPRCHRST input. Also activate SPRCHRD after a time greater than set
time SpChAlmTime.
9.3. At this condition, SPCHALM is activated.
10. Test of CB gas pressure indication
Testing functionality by secondary injection
Section 11
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