ABB RELION REX640 Technical Manual page 1230

Protection related functions
5.8.10 Technical data
Table 1174: CVPSOF Technical data
Characteristic
Operation accuracy
Operate time accuracy
Suppression of harmonics
5.9 Local acceleration logic DSTPLAL (ANSI 21LAL)
5.9.1 Identification
Function description
Local acceleration logic
5.9.2 Function block
Figure 698: Function block
5.9.3 Functionality
The local acceleration logic function DSTPLAL is a complementary function to the
distance protection function DSTPDIS. DSTPLAL is not intended for a stand-alone
use.
The main purpose of DSTPLAL is to achieve a fast fault clearing which is
independent of the fault location on the protected feeder when no communication
channel is available between the local and remote terminals. DSTPLAL enables a fast
fault clearing during certain conditions, but the function cannot completely replace
the communication scheme logic.
1230
Value
Depending on the frequency of the voltage
measured: f ±2Hz
n
Current: ±1.5 % of the set value or ±0.002 × I
Voltage: ±1.5 % of the set value or ±0.002 ×
U
n
±1.0 % of the set value or ±20 ms
DFT: -50 dB at f = n × f
IEC 61850 IEC 60617
identification identification
DSTPLAL LAL
1MRS759142 F
n
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
21LAL
REX640
Technical Manual