Hitachi Relion 670 Series Applications Manual page 162

Section 8
Current protection
Protection operate time:
Protection resetting time:
Breaker opening time:
The different characteristics are described in the technical reference manual.
INx>: Operate residual current level for step x given in % of IBase.
HarmBlockx: To enable freezing of timers of step x from 2nd harmonic restrain function.
k1: Time multiplier for the dependent (inverse) characteristic for step 1.
IN1Min: Minimum operate current for step 1 in % of IBase.
t1Min: Minimum operating time for inverse time characteristics. At high currents the inverse time
characteristic might give a very short operation time. By setting this parameter the operation time of
the step can never be shorter than the setting.
Operate
time
IEC15000250 V1 EN-US
Figure 61:
In order to fully comply with curves definition the setting parameter t1Min shall be set to the value
which is equal to the operate time of the selected IEC inverse curve for measured current of twenty
times the set current pickup value. Note that the operate time value is dependent on the selected
setting value for time multiplier k1.
8.4.4.2 Common settings
AngleRCA: Relay characteristic angle given in degree. This angle is defined as shown in Figure 62.
The angle is defined positive when the residual current lags the reference voltage (Upol = -2U
156
15-60 ms
15-60 ms
20-120 ms
IN1Min
Minimum operate current and operate time for inverse time characteristics
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t1Min
Current
IEC15000250-1-en.vsdx
1MRK506375-UEN Rev. N
M15282-81 v12
)
0
Railway application RER670
Application manual