LS Industrial Systems Susol Series - Short-Time Delay Relays

33
D
Digital Trip Relay
D
4. Relay Function
Short-Time Delay Relays
Long-Time
Delay(L)
Short-Time
Delay(S)
Instantane
ous(I)
Ground
Fault
Maximum time delay(sec)
Accuracy:15% or below 100ms
Continuous Thermal Memory Time
Current Setting(A)
Accuracy:10% or below 50ms
Maximum time delay(s)
@ 10 Ir
Current Setting(A)
Tripping time
Current Setting(A)
Accuracy:10%(Ig0.4In)
20% (Ig0.4 In) or below 50ms
Maximum time delay(s)
@ 1 In
tr @ (1.5 Ir)
tr @ (6.0 Ir)
tr @ (7.2 Ir)
Isd= Ir ...
Tsd
Ii= In ...
Ig= In ...
tg
12.5
0.5
0.34
1.5
0.05
20
80
2
0.2
0.05
20
80
25
1
0.69
2
0.1
0.1
80
140
3
0.3
0.1
0.1
80
140
50
2
1.38
3
0.2
0.2
160
240
4
0.4
0.2
0.2
160
240
100
4
2.7
4
0.3
0.3
260
340
6
0.5
0.3
0.3
260
340
200
8
5.5
5
0.4
0.4
360
440
8
0.6
0.4
0.4
360
440
300
12
8.3
6
10
0.7
400
16
11
8
12
0.8
500
20
13.8
10
15
1.0
off
off
off
off
off
off
I2T off
I2T on
Min. Trip
Time(ms)
Max. Trip
Time(ms)
I2t off
I2t on
Min. Trip
Time(ms)
Max. Trip
Time(ms)
Current Setting(A) (1.15
××
Ir)
Ir = In
××
...
0.4 0.5 0.6 0.7
0.8
0.9
1.0
below 50ms
The function for fault current (over current) protection which
has time delayed and definite time characteristic in inverse
ratio to fault current.
1) Standard current setting Knob-Isd
�Setting range : 1.5/ 2/ 3/ 4/ 5/ 6/ 8/ 10/ OFF Ir
2) Time delay setting Knob-Tsd
�Standard operating time is based on the time of 10lr.
�Inverse time (I2T On ) : 0.1/0.2/0.3/0.4 Sec
�Definite time (I2T Off) : 0.05/0.1/0.2/0.3/0.4 Sec
3) Short-Time Delay Operating Characteristic Formula
�T = td / I
T= Operating time [ms] Td = 1000*Tsd
I = Overload rate (Over current/Ir)
4) Relay operates basing on the largest load current among
R/S/T/N Phase.
5) Relay operating current can be adjustable by Fine Adjustment
6) Relay can operate at instantaneous current through ZSI
note1)
Note1) ZSI : Zone Selective Interlocking
The Lowest equipment pre-arranged with ZSI will operate
instantaneously regardless of time delay setting.
1. Short-Time Delay
2