Three-Phase Current Unbalance Protection For Shunt Capacitor Banks - ABB REV615 Product Manual

Capacitor Bank Protection and Control
REV615
Product version: 5.0 FP1
Table 58. Current unbalance protection for shunt capacitor banks (CUBPTOC) main settings
Parameter
Alarm mode
Start value
Alarm start value
Time multiplier
1)
Operating curve type
Operate delay time
Alarm delay time
1) For further reference, refer to the Operating characteristics table
Table 59. Three-phase current unbalance protection for shunt capacitor banks (HCUBPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy in definite time mode
Operate time accuracy in IDMT mode
Suppression of harmonics
1) Fundamental frequency current = 1.0 × I
2) Includes the delay of the signal output contact
Table 60. Three-phase current unbalance protection for shunt capacitor banks (HCUBPTOC) main settings
Parameter
Start value
Alarm start value
Time multiplier
1)
Operating curve type
Operate delay time
Alarm delay time
1) For further reference, refer to the Operating characteristics table
38
Function
CUBPTOC
CUBPTOC
CUBPTOC
CUBPTOC
CUBPTOC
CUBPTOC
CUBPTOC
, current before fault = 0.0 × I , fault current = 2.0 ×
n n
Function
HCUBPTOC
HCUBPTOC
HCUBPTOC
HCUBPTOC
HCUBPTOC
HCUBPTOC
Value (Range)
1 = Normal
2 = Element counter
0.01...1.00 × I
n
0.01...1.00 × I
n
0.05...15.00
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
50...200000 ms
50...200000 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 , where n = 2,3,4,5,..
n
Start value , results based on statistical distribution of 1000 measurements
Value (Range)
0.01...1.00 × I
n
0.01...1.00 × I
n
0.05...15.00
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
40...200000 ms
40...200000 ms
1MRS757952 D
Step
-
0.01
0.01
0.01
10
10
±2 Hz
n
n
Step
0.01
0.01
0.01
10
10
ABB