Table 244: PHLPTOC Technical revision history
Technical revision Change
B Minimum and default values changed to 40
ms for the
Operate delay time
setting
C Step value changed from 0.05 to 0.01 for the
Time multiplier
setting
D Internal improvement
E Internal improvement
4.1.2 Three-independent-phase non-directional overcurrent
protection PH3xPTOC
4.1.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-independent-phase non-di-
rectional overcurrent protection,
low stage
PH3LPTOC 3I_3> 51P-1_3
Three-independent-phase non-di-
rectional overcurrent protection,
high stage
PH3HPTOC 3I_3>> 51P-2_3
Three-independent-phase non-di-
rectional overcurrent protection, in-
stantaneous stage
PH3IPTOC 3I_3>>> 50P/51P_3
4.1.2.2 Function block
Figure 125: Function block
4.1.2.3 Functionality
The three-independent-phase non-directional overcurrent protection function
PH3xPTOC is used as one-phase, two-phase or three-phase non-directional
overcurrent and short circuit protection for feeders.
The function starts when the current exceeds the set limit. Each phase has its
own timer. The operating time characteristics for low-stage PH3LPTOC and high-
stage PH3HPTOC can be selected to be either definite time (DT) or inverse definite
minimum time (IDMT). The instantaneous stage PH3IPTOC always operates with the
DT characteristic.
Protection functions
1MRS757644 H
256 620 series
Technical Manual
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