21
2
．
Negative sequence current i2
≧
Negative sequence overcurrent section II value
（
I2dz2
）
；
3
．
Duration of meeting the above conditions
≧
Negative sequence overcurrent section II delay
（
T2zd2
）
；
If the above conditions are met, if the "trip" protection is turned on, immediately export 3J
(C7/C8), 4J (C9/C10), 5J (C11/C12), and drive the accident signal relay 11J (C1/C3) at the same
time (until manual reset, the relay Only return), the panel accident light is on; if the "alarm"
protection is turned on, the alarm signal relay 12J (C2/C3) is driven (the relay does not return until
manual reset), and the panel warning light is on. The logical block diagram of the action is shown
in 4-14:
Negative sequence
overcurrent section II--
trip
i2 Negative sequence
overcurrent section II
value
&
LCD display
Emergency signal outlet
Trip outlet
T Negative sequence
overcurrent section II
delay
Negative sequence
overcurrent section II--
alarm
&
LCD display
Alarm signal outlet
T Negative sequence
overcurrent section II
delay
Figure 4-13: Logic diagram of negative sequence overcurrent section II protection action
4.15 Negative sequence overcurrent section II inverse time limit
1
．
Three kinds of inverse time limits are provided, which are consistent with the current inverse
time limit calculation formula.
2
．
The setting value and delay of the negative sequence II stage inverse time limit and the negative
sequence II stage overcurrent adopt the same set of set values.
4.16 Zero sequence overcurrent
1
．
RLP16 Zero sequence overcurrent
－“
alarm/trip
”
；
2
．
Zero sequence overcurrent i0
≧
Zero sequence overcurrent value
（
I0dz4
）
；
3
．
Duration of meeting the above conditions
≧
Zero sequence overcurrent delay
（
T0zd4
）
；
If the above conditions are met, if the "trip" protection is turned on, immediately export 3J
(C7/C8), 4J (C9/C10), 5J (C11/C12), and drive the accident signal relay 11J (C1/C3) at the same
time (until manual reset, the relay Only return), the liquid crystal displays the action information,
the panel accident light is on; if the "alarm" protection is turned on, the alarm signal relay 12J
(C2/C3) is driven (until the manual reset, the relay does not return), the liquid crystal display
reports the action information, and the panel warning light is on . The logical block diagram of the
action is shown in 4-15:
Zero sequence overcurrent--
trip
i2 Zero sequence
overcurrent value
&
LCD display
Emergency signal outlet
Trip outlet
T Zero sequence
overcurrent delay
Zero sequence overcurrent--
alarm
&
LCD display
Alarm signal outlet
T Zero sequence
overcurrent delay
Figure 4-15: logic diagram of zero sequence overcurrent protection action
