Three-Independent-Phase Non-Directional Overcurrent Protection Ph3Xptoc - ABB RELION 620 Series Technical Manual

Protection functions
Table 244: PHLPTOC Technical revision history
Technical revision
B
C
D
E
4.1.2 Three-independent-phase non-directional overcurrent
protection PH3xPTOC
4.1.2.1 Identification
Function description
Three-independent-phase non-di-
rectional overcurrent protection,
low stage
Three-independent-phase non-di-
rectional overcurrent protection,
high stage
Three-independent-phase non-di-
rectional overcurrent protection, in-
stantaneous stage
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.
256
Change
Minimum and default values changed to 40
Operate delay time setting
ms for the
Step value changed from 0.05 to 0.01 for the
Time multiplier setting
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
PH3LPTOC 3I_3>
PH3HPTOC 3I_3>>
PH3IPTOC 3I_3>>>
1MRS757644 H
ANSI/IEEE C37.2
device number
51P-1_3
51P-2_3
50P/51P_3
620 series
Technical Manual