Technical Data - ABB REL650 series Technical Manual

Section 12
Scheme communication
12.4.7
12.5
12.5.1
516
to trip "instantaneously" during a fault condition when one or two of the phase currents
will become low due to a three-phase trip at the opposite IED, see figure 244. The current
measurement is performed internally and the internal STILL signal becomes logical one
under the described conditions. The load current in a healthy phase is in this way used to
indicate the tripping at the opposite IED. Note that this function will not operate in case of
three-phase faults, because none of the phase currents will be low when the opposite IED
is tripped.
BLOCK
OR
BC
0-
tLoadOn
STILL
0
LLACC
ANSI05000158 V1 EN
Figure 244: Loss-of-load acceleration - simplified logic diagram
Breaker closing signals can if decided be connected to block the function during normal
closing.

Technical data

Table 351: ZCLCPLAL technical data
Function
Operate load current, LoadCurr
Operate current, MinCurr
Timers
Scheme communication logic for residual overcurrent
protection ECPSCH (85)
Identification
Function description
Scheme communication logic for
residual overcurrent protection
TRLL
AND
ANSI05000158-1-en.vsd
Range or value
(1–100)% of IBase
(1–100)% of IBase
(0.000–60.000) s
IEC 61850 IEC 60617
identification identification
ECPSCH
1MRK 506 335-UUS A
Accuracy
± 1.0% of I
n
± 1.0% of I
n
± 0.5% ± 10 ms
ANSI/IEEE C37.2
device number
- 85
Technical manual