Table 55. Three-phase overload protection for shunt capacitor banks (COLPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz, and no
harmonics
5% of the set value or 0.002 × I
n
Start time for overload stage
1)2)
Typically 75 ms
Start time for under current stage
2)3)
Typically 26 ms
Reset time for overload and alarm stage
Typically 60 ms
Reset ratio
Typically 0.96
Operate time accuracy in definite time mode
1% of the set value or ±20 ms
Operate time accuracy in inverse time mode
10% of the theoretical value or ±20 ms
Suppression of harmonics for under current stage
DFT: -50 dB at f = n × f
n
, where n = 2,3,4,5,..
1)
Harmonics current before fault = 0.5 × I
n
, harmonics fault current 1.5 ×
Start value, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
3)
Harmonics current before fault = 1.2 × I
n
, harmonics fault current 0.8 ×
Start value, results based on statistical distribution of 1000 measurements
Table 56. Three-phase overload protection for shunt capacitor banks (COLPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value overload
COLPTOC
0.30...1.50 × I
n
0.01
Alarm start value
COLPTOC
80...120%
1
Start value Un Cur
COLPTOC
0.10...0.70 × I
n
0.01
Time multiplier
COLPTOC
0.05...2.00
0.01
Alarm delay time
COLPTOC
500...6000000 ms
100
Un Cur delay time
COLPTOC
100...120000 ms
100
Table 57. Current unbalance protection for shunt capacitor banks (CUBPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
1.5% of the set value or 0.002 × I
n
Start time
1)2)
Typically 26 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Operate time accuracy in definite time mode
1% of the theoretical value or ±20 ms
Operate time accuracy in inverse definite minimum time mode
5% of the theoretical value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2,3,4,5,..
1)
Fundamental frequency current = 1.0 × I
n
, current before fault = 0.0 × I
n
, fault current = 2.0 ×
Start value, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
Capacitor Bank Protection and Control
1MRS757952 D
REV615
Product version: 5.0 FP1
ABB
37
Summary of Contents for RELION REV615
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