Table 5.1.4.8.-3
Residual overvoltage protection, elements 59N-1 and
59N-2 (Continued)
Feature
Element 59N-1
Element 59N-2
Retardation time, typical
30 ms
30 ms
Set resetting time, 59N-1 RESET
0.07...60.0 s
100 ms
Drop-off/pick-up ratio, typical
0.96
0.96
Operate time accuracy:
-at definite-time characteristic
±
2% of the set
operate time or
±
25
ms
±
2% of the set
operate time or
±
25
ms
Operation accuracy
±
1.5% of the set
pickup value or
±
0.05% U
n
(VT)
±
1.5% of the set
pickup value or
±
0.05% U
n
(VT)
a)
Resetting time of the trip signal.
Table 5.1.4.8.-4
CBFAIL
Feature
Value
Set operate time
0.10...60.0 s
Phase-to-phase voltage threshold for
external triggering of the CBFAIL:
-pick-up/drop-off
0.15/0.10
×
U
n
(VT)
5.1.5.
Trip-circuit supervision
The trip-circuit supervision (TCS) detects open circuits, both when the circuit
breaker is open and closed, and trip-circuit supply failure.
The trip-circuit supervision is based on a constant current injection principle:
by applying operating voltage for the circuit breaker, a constant current is
forced to flow through the external trip circuit. If the resistance of the trip
circuit exceeds a certain limit, due to oxidation or a bad contact, for instance,
the trip-circuit supervision is activated and a warning appears on the LCD
together with a fault code. The warning signal from the trip-circuit
supervision can also be routed to SO2 by setting switch SGF1/8 to 1.
Under normal operating conditions, the applied external voltage is divided
between the relay
’
s internal circuit and the external trip circuit so that at least
20 V remains over the relay
’
s internal circuit. If the external trip circuit
’
s
resistance is too high or the internal circuit
’
s too low, due to welded relay
contacts, for instance, the voltage over the relay
’
s internal circuit falls below
20 V (15...20 V), which activates the trip-circuit supervision.
The operation condition is:
48
REU 610
Voltage Relay
Technical Reference Manual - ANSI Version
1MRS755972
Содержание REU 610
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