ABB Relion 630 Series RET630 Product Manual page 51

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 70. Three-phase underimpedance protection (UZPDIS)
Characteristic
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite-time mode
1)2)
1) Fn = 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 71. Three-phase underimpedance protection (UZPDIS) main settings
Parameter
Polar reach
Operate delay time
Table 72. Circuit breaker failure protection (CCBRBRF)
Characteristic
Operation accuracy
Operate time accuracy
Function
UZPDIS
UZPDIS
Value
Depending on the frequency of the current
and voltage measured f = fn ±2 Hz
±3.0% of the set value or ±0.2% x Zb
Typical 25 ms (±15 ms)
< 50 ms
Typical 1.04
< 40 ms
±1.0% of the set value or ±20 ms
Values (Range)
1 - 6000
0.04 - 200.00
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
±1.0% of the set value or ±30 ms
1MRS756978 D
Issued: 2011-05-18
Step
1
0.01
n
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