Figure. 5.3.4 - 73. Simplified function block diagram of the CUB function.
Measured input
The function block uses analog current measurement values and always uses calculated positive and
negative sequence currents. In the broken conductor mode (I2/I1) the function also uses the phase
currents RMS values of all phase currents to check the minimum current. Zero sequence and
component sequence angles are used for fault registering and for fault analysis processing. A -20 ms
averaged value of the selected magnitude is used for pre-fault data registering.
Table. 5.3.4 - 43. Measurement inputs of the I2> function.
Signal
Description
Time base
I1
Positive sequence current magnitude
5ms
I2
Negative sequence current magnitude
5ms
IZ
Zero sequence current magnitude
5ms
I1 ANG
Positive sequence current angle
5ms
I2 ANG
Negative sequence current angle
5ms
IZ ANG
Zero sequence current angle
5ms
IL1RMS
Phase L1 (A) measured RMS current
5ms
IL2RMS
Phase L2 (B) measured RMS current
5ms
IL3RMS
Phase L3 (C) measured RMS current
5ms
General settings
The following general settings define the general behavior of the function. These settings are static i.e.
it is not possible to change them by editing the setting group.
Name
Description
Range Step Default
Measured
magnitude
Defines whether the ratio between the positive and the negative sequence currents
are supervised or whether only the negative sequence is used in detecting
unbalance.
1: I2pu
2: I2/I1
-
1: I2pu
A
AQ
Q-F201
-F201
Instruction manual
Version: 2.04
86
Содержание AQ-F201
Страница 1: ...AQ F201 Overcurrent and Earth fault relay Instruction manual ...
Страница 220: ...Figure 7 4 146 Example block scheme A AQ Q F201 F201 Instruction manual Version 2 04 219 ...
Страница 226: ...Figure 8 4 151 Device installation A AQ Q F201 F201 Instruction manual Version 2 04 225 ...
Страница 227: ...Figure 8 4 152 Panel cutout dimensions and device spacing A AQ Q F201 F201 Instruction manual Version 2 04 226 ...