ABB RELION 620 Series Technical Manual page 754

Section 4
Protection functions
4.8.3.9
4.9
4.9.1
4.9.2
4.9.3
748
Technical data
Table 713: DQPTUV Technical data
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Operate time accuracy
Suppression of harmonics
Start value = 0.05 × S
1) , reactive power before fault = 0.8 ×
n
times, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Arc protection ARCSARC
Identification
Function description
Arc protection
Function block
A070686 V3 EN
Figure 380: Function block
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.
Value
Depending on the frequency of the measured
current and voltage:
f ±2 Hz
n
Reactive power range |PF| <0.71
Power:
±3.0% or ±0.002 × Q
Voltage:
±1.5% of the set value or ±0.002 × U
Typically 46 ms
<50 ms
Typically 0.96
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
Start value , reactive power overshoot 2
IEC 61850 IEC 60617
identification identification
ARCSARC ARC
1MRS757644 F
n
n
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
50L/50NL
620 series
Technical Manual