PROTECT ION TR I P UNI TS
3/49
Trip Time
Time Step
Excludability
Excludability trip Pre-Allarm
Curve
XT2-XT4 : t1 = 3…60 s @ 3 x I1 XT5: t1 = 3…48 s @ 3 x I1 XT7: t1 = 3…144 s @ 3 x I1 t1 = 3…144 s for XT7 t1 = 3…9 s for XT2-XT4-XT5 SI: k=0.14; α=0.02 VI: k=13.5; α=1 EI: k=80; α=2 SI: k=0.14; α=0.02 t = k / I 4: k=80; α=4 XT2 - XT4 : t2 = 0.05…0.4 s XT5: t2 = 0.05…0.5 s XT7: t2 = 0.05…0.8 s t2sel = 0.04…0.2 s @ 10 x In
1 s
no
no
50%...90% I1 step 1% t = k/I 2
1 s
no
no
50%...90% I1 step 1% t= (k t1)/((if/I1)α-1)
0.01 s
yes
yes
no
t = k
0.01 s 0.01 s 0.01 s
yes yes yes
Range: 0.1 … 30s
XT2 - XT4 : t2 = 0.05…0.4 s @ 10 x In XT5: t2 = 0.05…0.5 s @ 10 x In XT7: t2 = 0.05…0.8 s @ 10 x In
yes
no
t = k/I 2
Instantaneous
yes
no
no
t = k
Range: 0.1 … 30s
0.01 s
yes
t4 = Inst.0.1 …1 s with I > I4
0.05 s 0.01 s 0.01 s 0.05 s
yes yes yes yes yes yes
yes
50%...90% I4 step 1% t = k
t4sel = 0.04…0.2 s Range: 0.1 … 30s
t4 = 0.1…1 s
yes
50%...90% I4 step 1% t = k/I 2
Instantaneous
no
no
t = k
Instantaneous Monitor time range 40…500 ms
0.01 s
yes
no
no
t = k
t6 = 0.5…60 s
0.5 s
yes yes
yes
no
t = k
only signaling no
XT2 - XT4 : t2 = 0.05…0.4 s XT5: t2 = 0.05…0.5 s XT7: t2 = 0.05…0.8 s
0.01 s
yes
yes
no
t = k
t5sel = 0.04…0.2s Range: 0.1 … 30s
0.01 s 0.01 s
yes yes yes yes yes yes yes
yes
only signaling no
t8 = 0.05…120 s t9 = 0.05…120 s t15 = 0.05…120 s t16 = 0.05…120 s
0.01 s 0.01 s 0.01 s 0.01 s
yes yes yes yes
no no no no
t = k t = k t = k t = k
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