Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 65/220
2.12.5 Setting
Guidelines
•
When the overcurrent option is enabled, the I>3 current setting applied should be
above load current, and > 35% of peak magnetising inrush current for any connected
transformers as this element has no second harmonic blocking. Setting guidelines for
the I>3 element are shown in more detail in Table below.
•
When a Zone 1 Extension scheme is used along with autoreclosure, it must be
ensured that only Zone 1 distance protection can trip instantaneously for TOR.
Typically, TOR-SOTF Mode bit 0 only would be set to “1”. Also the I>3 element must
be disabled to avoid overreaching trips by level detectors.
2.12.5.1
Inputs
Data Type
Description
Ia<, Ib<, Ic<
Internal Logic
No current detected (I< threshold, by default 5% In
or I< CB fail)
Dist Trip
Internal Logic
Trip by Distance logic
AR_RECLAIM
Internal Logic
Internal AR reclaim in progress
INP_RECLAIM
Digital Input
External AR in progress (by opto)
CBC_closing order
Internal Logic
Closing order in progress by CB Control
INP_CB_Man_Close
Digital Input
CB Closing order (by opto)
CB Control activated
Configuration
CB control activated
1P or 3 P AR
Configuration
1P or 3P AR enabled
TOR Zi Enable
Configuration
TOR logic enabled in case of fault in Zi
TOR All Zones Enable
Configuration
TOR logic enabled in case for all zones (Distance
Start)
Dist. Scheme Enable
Configuration
Distance scheme aided Trip logic applied
SOTF LD Enable
Configuration
Levels detectors in SOTF activated
SOTF All Zones Enable
Configuration
SOTF logic enabled for all zones (Distance Start)
Va>, Vb>, Vc>
Internal Logic
Live Voltage detected ( V Live Line threshold, fixed
at 70% Vn)
Valid_stx_PHOC
Configuration
Threshold I>3 must be activated
PHOC_Start_3Ph_I>3
Internal Logic
Detection by I>3 overcurrents (not filtered by
INRUSH.)
Z1, Z2, Z3, all zones
Internal Logic
Zones Detected
2.12.5.2
Outputs
Data Type
Description
TOC_A
Internal Logic
Trip phase A by TOR /SOTF
TOC_B
Internal Logic
Trip phase B by TOR /SOTF
TOC_C
Internal Logic
Trip phase C by TOR /SOTF
SOTF/TOR trip
Internal Logic
Trip by SOTF (manual close) or TOR (AR close)
logic
Содержание MiCOM P441
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