ABB ret650, Technical Manual

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calculated. If it is found to be above 60% the trip request counter is reset and TRIP
remains zero.
9. Finally, a check is made if the trip request counter is equal to or higher than 2. If
it is and that at the same instance of time t
REFtrip
, the actual bias current at this
instance of time t
REFtrip
is at least 50% of the highest bias current Ibiasmax
(Ibiasmax is the highest recording of any of the three phase currents measured
during the disturbance) then REFPDIF sets the output TRIP to 1. If the counter is
less than 2, the TRIP signal remains 0.
6.2.8 Technical data
Table 43: REFPDIF technical data
Function Range or value Accuracy
Operate characteristic Adaptable ± 1% of IBase if Ibias < 1.25
IBase (i.e. base sensitivity in
section 1 of the operate -
restrain characteristic)
± 2% of theoretical operate
value (Idiff) if Ibias >= 1.25
IBase (i.e. sections 2 and 3)
(The above is valid if IBase is
equal to the protected winding
rated current.)
Reset ratio 0.95 -
Directional characteristic, for
zero sequence directional
function
ROA ± 60 to ± 90 degrees ± 1 degrees at Ibias = IBase
± 2 degrees at Ibias = 2 *
IBase
± 3 degrees at Ibias = 4 *
IBase
(The above is valid if IBase is
equal to the protected winding
rated current.)
Operate time, trip function 25 ms typically at 0 to 10 x IdMin -
Reset time, trip function 30 ms typically at 10 to 0 x IdMin -
6.3 1Ph High impedance differential protection HZPDIF
6.3.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
1Ph High impedance differential
protection
HZPDIF
Id
SYMBOL-CC V2 EN
87
1MRK 504 135-UEN A
Section 6
Differential protection
119
Technical manual