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REF 610
60
Feeder Protection Relay
Technical Reference Manual
Table 4.1.4.11-3 Stage θ>
Feature
Set full load current, I
θ
Set alarm level, θ
>
a
Trip level, θ
>
t
Time constant, τ
Operate time accuracy
• I/I
>1.2
θ
Table 4.1.4.11-4 Stage ∆I>
Feature
Set start value, ∆I>
• at definite-time characteristic
Start time, typical
Time/current characteristics
• definite time
operate time, t
>
∆
Resetting time, maximum
Drop-off/pick-up ratio, typical
Operate time accuracy
• at definite-time characteristic
Operation accuracy
• 10...100%
Table 4.1.4.11-5 Stage ARC and L>
Feature
Stage ARC
Set current limit
• ArcI>
• ArcI
>
0
Operate time
Resetting time
Operation accuracy
L>
Activation time of L>
Resetting time
1)
Applies only if a signal output contact (SO1...5) is used. If a power output contact (PO1...3) is used,
2...3 ms will be added.
Value
0.30...1.50 x I
n
50...100%
100%
1...200 min
±2% of the set
operate time or
±1 s
Value
10...100%
100 ms
1...300 s
70 ms
0.90
±2% of the set
operate time or
±25 ms
±3% of the set
start value and ±1
unit
Value
0.5...35.0 x I
n
5.0...400% I
n
1)
< 15 ms
30 ms
±7% of the set
start value
< 15 ms
20 ms
1MRS 755310
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