ABB RELION REX640 Technical Manual page 1085

1MRS759142 F
4.8.4.10 Technical data
Table 1026: MPUPF Technical data
Characteristic
Operation accuracy
Operate time accuracy
Suppression of harmonics
Reset time
4.9 Arc protection ARCSARC (ANSI AFD)
4.9.1 Identification
Function description
Arc protection
4.9.2 Function block
Figure 608: Function block
4.9.3 Functionality
The arc protection function ARCSARC detects arc situations in air-insulated metal-
clad switchgears caused by, for example, human errors during maintenance or
insulation breakdown during operation.
The function detects light from an arc either locally or via a remote light signal.
The function also monitors phase and residual currents to be able to make accurate
decisions on ongoing arcing situations.
The function contains a blocking functionality. Blocking deactivates all outputs and
resets timers.
REX640
Technical Manual
Value
Dependent on the frequency of the current
measured: f ±2 Hz
n
±0.018 for power factor
±(1.0 % or 30 ms)
DFT: -50 dB at f = n × f
7
<40 ms
IEC 61850 IEC 60617
identification identification
ARCSARC ARC
Protection functions
, where n = 2, 3, 4, 5, 6,
n
ANSI/IEEE C37.2
device number
AFD
1085