14
motor, the device starts timing and displays "motor start....." on the device. When the timing time
is greater than the motor start time TQD, set the start completion flag, display the "m" icon in the
upper right corner of the LCD, and open the time limit quick break, overcurrent, overcurrent
inverse time limit, overload and locked rotor protection.
2. The judgment condition for motor shutdown is
①
The opening of the circuit breaker is R1 = 0 and R2 = 1.
②
The three-phase protection current is less than 0.1*Ie
As long as any of the above conditions is met, the device judges that the motor state is shutdown,
and the "m" icon displayed on the LCD disappears.
4.2 Differential quick break
1
．
RLP01
Differential quick break
－“
ON
”
；
2
．
Any phase of differential current
（
Ida
、
Idb
、
Idc
）≧
Differential quick break value
（
Icddz
）
；
Ida=|ia1+
ia2*Kijw/Kijd
|
，
Idb=|ib1+ib2
*Kijw/Kijd
|
，
Idc=|ic1+ic2
*Kijw/Kijd
|
—
Vector
calculation
If the above conditions are met, the protection immediately exports 3j (C7 / C8), 4J (C9 /
C10), 5J (C11 / C12), and drives the accident signal relay 11j (C1 / C3) (the relay does not return
until manual reset), and the panel accident light is on. The return value of differential quick break
is 9 / 10 of the determined value of differential quick break. The logic block diagram of action is
shown in 4-1:
Differential quick break--ON
Ida Differential quick break value
Idb Differential quick break value
Idc Differential quick break value
1
&
LCD display
Emergency signal outlet
Trip outlet
Figure 4-1: action logic diagram of differential quick break protection
4.3 Ratio differential
1
．
RLP02 Ratio differential
－“
ON
”
；
2
．The action criterion is：
When the braking current Izx is less than the inflection point current Igd, Idx>Icdqd
；
When the braking current Izx is greater than or equal to the inflection point current Igd,
Idx-Icdqd>(Izx-Igd)*Kb1
；
Among them
：
x=a
，
b
，
c
Ida=|ia1+ia2
*Kijw/Kijd
|
，
Idb=|ib1+ib2
*Kijw/Kijd
|
，
Idc=|ic1+ic2
*Kijw/Kijd
|
—
Vector
calculation
Iza=|ia1-ia2
*Kijw/Kijd
|/2
，
Izb=|ib1-ib2
*Kijw/Kijd
|/2
，
Izc=|ic1-ic2
*Kijw/Kijd
|/2
——
Vector
calculation
Kb1 is the ratio braking coefficient
；
Idx is the differential current of phase a or phase B or phase C
；
Izx is the braking current of phase a or phase B or phase C
；
3
．
If RLP05 CT disconnection locking ratio differential is input, it is required that CT has no
instantaneous disconnection
；
4
．
Differential quick break does not act
；
If the above conditions are met, the protection immediately exports 3j (C7 / C8), 4J (C9 /
