Table 78. Tap changer control with voltage regulator (OLATCC)
Characteristic
Value
Operation accuracy
1)
Depending on the frequency of the current measured: fn ±2
Hz
Differential voltage Ud
± 1.0% of the measured value
or ± 0.004 x Un (in measured
voltages < 2.0 x Un)
Operation value
± 1.0% of the Ud or ±0.004 x
Un for Us = 1.0 x Un
Operate time accuracy in definite time mode
2)
± 1.0% of the set value or
0.11 seconds
Operate time accuracy in inverse time mode
3)
± 15.0% of the set value or
0.15 s
(at theoretical B in range of
1.1…5.0) Also note fixed
minimum operate time
(IDMT) 1 s
Reset ratio for control operation
Typical 0.80 (1.20)
Reset ratio for analogue based blockings (except run back
raise voltage blocking)
Typical 0.96 (1.04)
1) Default setting values used
2) Default setting values used
3) Default setting values used
Transformer Protection and Control
1MRS756978 D
RET630
Product version: 1.1
Issued: 2011-05-18
54
ABB
Содержание Relion 630 Series RET630
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