Section 4 Protection Functions; Three-Phase Current Protection; Three-Phase Non-Directional Overcurrent Protection Phxptoc307; Identification - ABB RELION REX640 Technical Manual

1MRS759142 C
Section 4
4.1
4.1.1
4.1.1.1
4.1.1.2
4.1.1.3
REX640
Technical Manual
Protection functions

Three-phase current protection

Three-phase non-directional overcurrent protection
PHxPTOC

Identification

Function description
Three-phase non-directional
overcurrent protection, low stage
Three-phase non-directional
overcurrent protection, high stage
Three-phase non-directional
overcurrent protection, instantaneous
stage

Function block

GUID-6095569C-AEFA-41ED-ACA7-0798A4B88CC1 V1 EN
Figure 174: Function block

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.
In the DT mode, the function operates after a predefined operate time and resets when
the fault current disappears. The IDMT mode provides current-dependent timer
characteristics.
Protection functions
IEC 61850 IEC 60617
identification identification
PHLPTOC 3I>
PHHPTOC 3I>>
PHIPTOC 3I>>>
Section 4
ANSI/IEEE C37.2
device number
51P-1
51P-2
50P
307