ABB Relion 630 Series RET630 Product Manual page 50

Transformer Protection and Control
RET630
Product version: 1.1
Table 67. Underfrequency protection (DAPTUF) main settings
Parameter
Start value
Operate delay time
Table 68. Overexcitation protection (OEPVPH)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in
definite-time mode
Operate time accuracy in
inverse-time mode
1) Results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 69. Overexcitation protection (OEPVPH) main settings
Parameter
Leakage React
Start value
Time multiplier
Operating curve type
Operate delay time
50
Function
DAPTUF
DAPTUF
Value
Depending on the frequency of the voltage measured: fn ±2
Hz
±2.5% of the set value or 0.01 x Ub/f
Frequency change
Voltage change
< 60 ms
Typical 0.96
< 45 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±50 ms
Function
OEPVPH
OEPVPH
OEPVPH
OEPVPH
OEPVPH
Value (Range)
35.0...64.0 Hz
0.170...60.000 s
Typical 200 ms (±20 ms)
Typical 100 ms (±20 ms)
Values (Range)
0.0 - 50.0
100 - 200
0.1 - 100.0
ANSI Def. Time
IEC Def. Time
OvExt IDMT Crv1
OvExt IDMT Crv2
OvExt IDMT Crv3
OvExt IDMT Crv4
0.10 - 200.00
1MRS756978 D
Issued: 2011-05-18
Step
0.1
0.001
Step
0.1
1
0.1
-
0.01
ABB