ABB RELION 620 Series Technical Manual page 788

Section 4
Protection functions
4.12.1.9
4.12.1.10
4.12.2
4.12.2.1
782
Technical data
Table 746: COLPTOC Technical data
Characteristic
Operation accuracy
Start time for overload stage
Start time for under current stage
Reset time for overload and alarm stage
Reset ratio
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics for under current stage
1) Harmonics current before fault = 0.5 × I
statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Harmonics current before fault = 1.2 × I
statistical distribution of 1000 measurements
Technical revision history
Table 747: COLPTOC Technical revision history
Technical revision
B
Current unbalance protection for shunt capacitor banks
CUBPTOC
Identification
Table 748: Function identification
Function description
Current unbalance protection for shunt
capacitor banks
Value
Depending on the frequency of the measured
current: f
5% of the set value or 0.002 × I
Typically 75 ms
1)2)
Typically 26 ms
2)3)
Typically 60 ms
Typically 0.96
1% of the set value or ±20 ms
10% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f
, harmonics fault current 1.5 ×
n
, harmonics fault current 0.8 ×
n
Change
Internal improvement.
IEC 61850
identification
CUBPTOC
1MRS757644 F
±2 Hz, and no harmonics
n
n
, where n = 2,3,4,5,..
n
Start value , results based on
Start value , results based on
IEC 60617 ANSI/IEEE C37.2
identification device number
dI>C 51NC-1
Technical Manual
620 series