• None of the three-phase currents exceeds the
I
set
high limit setting.
• At least one of the three-phase currents exceeds the
I
set
low limit setting.
• At least one of the three-phase currents are below the
I
set
low limit setting.
• The ratio between the calculated minum and maximum of the three-phase currents is below
the
I
set
ratio setting.
• The ratio between the negative sequence and the positive sequence exceeds the
I2/I1
ratio setting.
• The calculated difference (IL1+IL2+IL3+I0) exceeds the
I
sum
difference setting (optional).
• The above-mentioned condition is met until the set time delay for alarm.
The inputs of the function are the following:
• setting parameters
• measured and pre-processed current magnitudes.
The function's outputs are CTS ALARM and BLOCKED signals which can be used for direct I/O
controlling and user logic programming. The function generates general time-stamped ON/OFF events
to the common event buffer from each of the output signals. The time stamp resolution is 1 ms. The
function also provides a resettable cumulative counter for the CTS ALARM and BLOCKED events.
The following figure presents a simplified function block diagram of the current transformer supervision
function.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00001
361
Summary of Contents for Generator Commander
Page 1: ...Generator Commander Instruction manual...
Page 2: ......
