Table 103. Current unbalance protection for shunt capacitor banks (CUBPTOC) main settings
Parameter
Function
Value (Range)
Step
Alarm mode
CUBPTOC
1 = Normal
2 = Element counter
-
Start value
CUBPTOC
0.01...1.00 × I
n
0.01
Alarm start value
CUBPTOC
0.01...1.00 × I
n
0.01
Time multiplier
CUBPTOC
0.05...15.00
0.01
Operating curve type
1)
CUBPTOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Operate delay time
CUBPTOC
50...200000 ms
10
Alarm delay time
CUBPTOC
50...200000 ms
10
1)
For further reference, see the Operating characteristics table
Table 104. Three-phase current unbalance protection for shunt capacitor banks (HCUBPTOC)
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 IDMT 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
Table 105. Three-phase current unbalance protection for shunt capacitor banks (HCUBPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
HCUBPTOC
0.01...1.00 × I
n
0.01
Alarm start value
HCUBPTOC
0.01...1.00 × I
n
0.01
Time multiplier
HCUBPTOC
0.05...15.00
0.01
Operating curve type
1)
HCUBPTOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Operate delay time
HCUBPTOC
40...200000 ms
10
Alarm delay time
HCUBPTOC
40...200000 ms
10
1)
For further reference, see the Operating characteristics table
1MRS759144 A
REX640
Product version: 1
62
ABB
Summary of Contents for RELION REX640
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