6.1. Test the set timing defined by
RatedOperCurr
,
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
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI
277
Commissioning manual
Summary of Contents for RELION RET670
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