ABB RELION REX640, Техническое руководство, Страница: 1230 / 1960

5.8.10 Technical data
Table 1174: CVPSOF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the voltage
measured: f
n
±2Hz
Current: ±1.5 % of the set value or ±0.002 × I
n
Voltage: ±1.5 % of the set value or ±0.002 ×
U
n
Operate time accuracy ±1.0 % of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
5.9 Local acceleration logic DSTPLAL (ANSI 21LAL)
5.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Local acceleration logic DSTPLAL LAL 21LAL
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.
Protection related functions 1MRS759142 F
1230 REX640
Technical Manual