PROTECT ION TR I P UNI TS
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Trip Time
Time Step
Excludability
Excludability trip Pre-Allarm
Curve
t14 = 0.5…60 s t20 = 0.05…30 s
0.5 s
yes yes
yes yes
no no
t = k t = k
0.01 s
t21 = 0.05…30 s
0.01 s
yes
yes
no
t = k
t22 = 0.5…120 s t12 = 0.15…300 s t13 = 0.15…300 s t17 = 0.15…300 s t18 = 0.15…300 s t11 = 0.5…100 s
0.01 s 0.01 s 0.01 s 0.01 s 0.01 s
yes yes yes yes yes yes yes yes yes yes
yes yes yes yes yes yes
no no no no no no
t = k t = k t = k t = k t = k t = k
0.1 s
only signaling no
t7 Fw/Bw = 0.2...0.8 s
0.01 s 0.01 s 0.01 s
yes
no
t = k
t7sel = 0.13…0.5s Range 0.1…0.8s
t24 = 0.5…100 s
0.1 s
yes
yes
no
t = k
t24 = 0.5…100 s
0.1 s
yes
yes
no
t = k
yes yes yes yes yes
t27 = 0.5…100 s t26 = 0.5…100 s t23 = 0.5…100 s
0.5 s 0.5 s 0.5 s
yes yes yes
no no no
t = k t = k t = k
Range from closing: 0.1…30S or with digital input
0.01 s
-
t28 = 0.5...10 s for f>f28 XT2-XT4: 5E - 10E - 20E
0.01 s
yes
yes
no
t = k
t = k/I 2
XT5-XT7: 5E - 10E - 20E - 30E tj = 1…10 s
0.5 s 0.5 s 0.5 s 0.5 s
t = k t = k t = k t = k
ts = 2…10 s tu = 1…10 s tuc = 1…20 s
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