Three-Phase Overload Protection For Shunt Capacitor Banks (Colptoc); Current Unbalance Protection For Shunt Capacitor Banks (Cubptoc) - ABB REX640 Product Manual

REX640
Product version: 1
Table 100. Three-phase overload protection for shunt capacitor banks (COLPTOC)
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
2) Includes the delay of the signal output contact
3) Harmonics current before fault = 1.2 × I
Table 101. Three-phase overload protection for shunt capacitor banks (COLPTOC) main settings
Parameter
Start value overload
Alarm start value
Start value Un Cur
Time multiplier
Alarm delay time
Un Cur delay time
Table 102. Current unbalance protection for shunt capacitor banks (CUBPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy in definite time mode
Operate time accuracy in inverse definite minimum time mode
Suppression of harmonics
1) Fundamental frequency current = 1.0 × I
2) Includes the delay of the signal output contact
ABB
1)2)
2)3)
, harmonics fault current 1.5 ×
n
, harmonics fault current 0.8 ×
n
Function
COLPTOC
COLPTOC
COLPTOC
COLPTOC
COLPTOC
COLPTOC
, current before fault = 0.0 × I
n n
Value
Depending on the frequency of the measured current: f
harmonics
5% of the set value or 0.002 × I
Typically 75 ms
Typically 26 ms
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
Start value , results based on statistical distribution of 1000 measurements
Start value , results based on statistical distribution of 1000 measurements
Value (Range)
0.30...1.50 × I
n
80...120%
0.10...0.70 × I
n
0.05...2.00
500...6000000 ms
100...120000 ms
Value
Depending on the frequency of the measured current: f
1.5% of the set value or 0.002 × I
Typically 26 ms
Typically 40 ms
Typically 0.96
1% of the theoretical value or ±20 ms
5% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f
Start value , results based on statistical distribution of 1000 measurements
, fault current = 2.0 ×
1MRS759144 A
n
, where n = 2,3,4,5,..
n
Step
0.01
1
0.01
0.01
100
100
n
, where n = 2,3,4,5,..
n
±2 Hz, and no
n
±2 Hz
n
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