Table 106. Shunt capacitor bank switching resonance protection, current based (SRCPTOC)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: fn ±2 Hz
Operate value accuracy:
±3% of the set value or ±0.002 × I
n
(for 2
nd
order Harmonics)
±1.5% of the set value or ±0.002 × I
n
(for 3
rd
order < Harmonics < 10th
order)
±6% of the set value or ±0.004 × I
n
(for Harmonics >= 10th order)
Reset time Typically 45 ms or maximum 50 ms
Retardation time Typically 0.96
Retardation time <35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics -50 dB at f = f
n
Table 107. Shunt capacitor bank switching resonance protection, current based (SRCPTOC) main settings
Parameter
Function Value (Range) Step
Alarm start value SRCPTOC
0.03...0.50 × I
n
0.01
Start value SRCPTOC 0.03...0.50 × I
n
0.01
Tuning harmonic Num SRCPTOC 1...11 1
Operate delay time SRCPTOC 120...360000 ms 1
Alarm delay time SRCPTOC 120...360000 ms 1
Table 108. Compensated neutral unbalance voltage protection (CNUPTOV)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 1.1 × set
Start value
Typically 75 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Operate time accuracy ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Start value
= 0.1 × U
n
, Voltage before fault = 0.9 × U
n
, f
n
= 50 Hz, overvoltage in one phase-to-earth with nominal frequency injected from random phase angle, results based on statistical
distribution of 1000 measurements
2) Measured with static signal output (SSO)
Table 109. Compensated neutral unbalance voltage protection (CNUPTOV) main settings
Parameter
Function Value (Range) Step
Start value CNUPTOV 0.01...1.00 × U
n
0.01
Operate delay time CNUPTOV 100...300000 ms 100
1MRS759144 A
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