Section 4
Protection functions
4.1
Three-phase current protection
4.1.1
Three-phase non-directional overcurrent protection
PHxPTOC
4.1.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase non-directional
overcurrent protection, low stage
PHLPTOC
3I>
51P-1
Three-phase non-directional
overcurrent protection, high stage
PHHPTOC
3I>>
51P-2
Three-phase non-directional
overcurrent protection, instantaneous
stage
PHIPTOC
3I>>>
50P/51P
4.1.1.2
Function block
A070553 V1 EN
Figure 37:
Function block
4.1.1.3
Functionality
The three-phase non-directional overcurrent protection function PHxPTOC is used as
one-phase, two-phase or three-phase non-directional overcurrent and short-circuit
protection.
The function starts when the current exceeds the set limit. The operate time
characteristics for low stage PHLPTOC and high stage PHHPTOC can be selected to
be either definite time (DT) or inverse definite minimum time (IDMT). The
instantaneous stage PHIPTOC always operates with the DT characteristic.
1MRS757454 D
Section 4
Protection functions
611 series
89
Technical Manual
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