Scheme communication
Table 78. Scheme communication logic for distance or overcurrent protection ZCPSCH
Function Range or value Accuracy
Scheme type Off
Intertrip
Permissive UR
Permissive OR
Blocking
DeltaBlocking
-
Operate voltage, Delta U (0–100)% of UBase ±5.0% of ΔU
Operate current, Delta I (0–200)% of IBase ±5.0% of ΔI
Operate zero sequence voltage,
Delta 3U0
(0–100)% of UBase ±10.0% of Δ3U0
Operate zero sequence current,
Delta 3I0
(0–200)% of IBase ±10.0% of Δ3I0
Co-ordination time for blocking
communication scheme
(0.000-60.000) s ±0.5% ±10 ms
Minimum duration of a carrier send
signal
(0.000-60.000) s ±0.5% ±10 ms
Security timer for loss of guard signal
detection
(0.000-60.000) s ±0.5% ±10 ms
Operation mode of unblocking logic Off
NoRestart
Restart
-
Table 79. Phase segregated scheme communication logic for distance protection ZC1PPSCH
Function
Range or value Accuracy
Scheme type Intertrip
Permissive UR
Permissive OR
Blocking
-
Co-ordination time for blocking
communication scheme
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Minimum duration of a carrier send
signal
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Table 80. Current reversal and weak-end infeed logic for phase segregated communication ZC1WPSCH
Function Range or value Accuracy
Detection level phase to neutral
voltage
(10-90)% of UBase ±0.5% of U
r
Detection level phase to phase
voltage
(10-90)% of UBase ±0.5% of U
r
Reset ratio <105% at (20-90)% of UBase -
Operate time for current reversal (0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Delay time for current reversal (0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Coordination time for weak-end
infeed logic
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
1MRK 505 346-BEN -
Line differential protection RED670 2.1 IEC
Product version: 2.1
88 ABB
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