Scheme communication
M16038-1 v15
Table 63. 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
±0.2% 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
-
M16039-1 v16
Table 64. Current reversal and weak-end infeed logic for distance protection Current reversal and WEI logic for distance protection, 3-phase
ZCRWPSCH
Function
Range or value
Accuracy
Operating mode of WEI logic
Off
Echo
Echo & Trip
-
Detection level phase-to-phase
and phase-to-neutral voltage
(10-90)% of UBase
±0.5% of U
r
Reset ratio
<105%
-
Operate time for current reversal
logic
(0.000-60.000) s
±0.5% ±10 ms
Delay time for current reversal
(0.000-60.000) s
±0.5% ± 10 ms
Coordination time for weak-end
infeed logic
(0.000-60.000) s
±0.5% ±10 ms
M16049-1 v10
Table 65. Scheme communication logic for residual overcurrent protection ECPSCH
Function
Range or value
Accuracy
Scheme type
Permissive Underreaching
Permissive Overreaching
Blocking
-
Communication scheme
coordination time
(0.000-60.000) s
±0.2% or ±20 ms whichever is greater
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
82
Hitachi Power Grids
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