ABB RELION REX640 - 4.8.4.10 Technical data; 4.9 Arc protection ARCSARC (ANSI AFD); 4.9.1 Identification; 4.9.2 Function block

4.8.4.10 Technical data
Table 1026: MPUPF Technical data
Characteristic Value
Operation accuracy Dependent on the frequency of the current
measured: f
n
±2 Hz
±0.018 for power factor
Operate time accuracy ±(1.0 % or 30 ms)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, 6,
7
Reset time <40 ms
4.9 Arc protection ARCSARC (ANSI AFD)
4.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Arc protection ARCSARC ARC AFD
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.
1MRS759142 F
Protection functions
REX640
Technical Manual
1085