Scheme communication
M16038-1 v14
Table 90. Scheme communication logic with delta based blocking scheme signal transmit 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 ±0.2% or ±15 ms whichever is greater
Minimum duration of a carrier
send signal
(0.000-60.000) s ±0.2% or ±45 ms whichever is greater
Security timer for loss of guard
signal detection
(0.000-60.000) s ±0.2% or ±15 ms whichever is greater
Operation mode of unblocking
logic
Off
NoRestart
Restart
-
SEMOD166936-2 v7
Table 91. 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
Line differential protection RED670
1MRK 505 379-BEN N
118 Hitachi Power Grids
© Copyright 2017 Hitachi Power Grids. All rights reserved
To Next Page
Loading...
