30
EATON
www.eaton.com
Phase sequence protection
It is used in occasions where phase sequence is required. The
phase sequence is detected from primary voltage. When it is
detected different from the set direction, the protection will act
with the protection action characteristics set as instantaneous. If
one-phase or multi-phase voltage does not exist, this function will
automatically exit.
Action phase sequence setting range
Ф
: A, B, C /
Ф
: A, C, B
Alarm contact output
When the execution mode is alarm, the "voltage imbalance alarm" contact output can be added
Frequency protection
Over frequency protection
It is used for generator protection. When the circuit frequency is
greater than the action threshold set point, the circuit breaker will
trip or send out an alarm signal after the action delay time (fixed
time action). Then, if the circuit frequency is less than the return
threshold set point, the circuit breaker will remove the alarm
signal after the return delay time (fixed time action). The over
frequency protection function can be set to Enabled or Disabled.
When enabled, it includes sending an alarm signal or tripping.
Under frequency protection
It is used for generator protection. When the circuit frequency is
less than the action threshold set point, the circuit breaker will trip
or send out an alarm signal after the action delay time (fixed time
action). Then, if the circuit frequency is greater than the return
threshold set point, the circuit breaker will remove the alarm
signal after the return delay time (fixed time action). The under
frequency protection function can be set to Enabled or Disabled.
When enabled, it includes sending an alarm signal or tripping.
Action threshold (Hz)
Under frequency
45 ~ return value (Step is 0.5)
Over frequency
Return value ~ 65 (Step is 0.5)
Action delay time (s)
0.2 ~ 50 (Step is 0.1)
Return threshold (Hz)
Over frequency
Start value ~ 65 (Step is 0.5)
This set point is only available when the
execution mode is "Alarm".
Over frequency
45 ~ start value (Step is 0.5)
Return delay time (s)
0.2~36.0 (Step is 0.1)
Alarm contact output
When the execution mode is alarm, the “under frequency alarm” and “over frequency alarm” contact output can
be added
Reverse power protection
It is used for generator protection. When the power is reversed,
the generator may be damaged if it is running. If the power flows
in a direction opposite to the set power’s direction, and is greater
than the action threshold set point, the protection will be activat-
ed. Power direction and power supply incoming direction are set
in Measurement Setting Table’s menu, and must be in line with
actual application conditions.
Action threshold (kW)
5 ~ 500 (Step is 1)
Action delay time (s)
0.2 ~ 20 (Step is 0.1)
Return threshold (kW)
5 ~ start value (Step is 1)
This set point is only available when the execution
mode is "Alarm", and the return value must be
greater than or equal to the start value.
Return delay time (s)
1.0 ~ 360 (Step is 1)
Action or alarm characteristics
(Delay tolerance ±10%)
Reverse power value / set point
1.1
Fixed time action or alarm
Reverse power value / set point <0.9
No action or alarm
Reverse power protection alarm
return characteristics (Delay
tolerance ±10%)
Reverse power value / set point
0.9
Return
Reverse power value / set point >1.1
No return
Alarm contact output
When the execution mode is alarm, the "under voltage alarm" contact output can be added
Instruction Leafl et
Effective September 2022
IZM6 Series Air Circuit Breaker
Operating Instruction Leafl et