Three-phase directional overcurrent fault detection DPHPTOC
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase directional overcurrent
fault detection
DPHPTOC 3I>-> 67P
Functionality
The three-phase directional overcurrent fault detection function DPHPTOC is used as
one-phase, two-phase or three-phase directional overcurrent and short circuit fault
detection. The function starts when the current exceeds the set limit and directional
criterion is fulfilled. DPHPTOC operates with definite time characteristic, that is, the
function operates after a predefined operate time and resets immediately when the
fault current disappears.
Operation principle
The Operation setting is used to enable or disable the function. The corresponding
parameter values are "On" and "Off".
The operation of DPHPTOC can be described by using a module diagram. All
modules in the diagram are explained in the next sections.
I_A
Op general
I_C
I_B
Op phsA
t
Timer
Op phsB
Op phsC
Str general
Str phsA
Str phsA
Str phsA
Level
detector
U_AB
U_CA
U_BC
Directional
calculation
Str dirGeneral
Str dirPhsA
Str dirPhsb
Str dirPhsc
Phase
selection
logic
GUID-2AF67C1E-7D35-4BE0-8E27-B9C37F8B9579 V1 EN
Figure 53: Functional module diagram
Directional calculation
The directional calculation module compares the current phasor with the polarizing
phasor. Cross polarizing voltage quantities are used as polarizing phasors. The
directional operation can be selected with the Directional mode setting. "Forward" or
"Reverse" or “Non directional” operation can be selected.
The Characteristic angle setting is used to turn the directional characteristic. The
value of Characteristic angle should be selected in such a way that all faults in the
operating direction are seen in the operating zone and all faults in the opposite
Section 6 1MRS757488 H
Commissioning
92 RIO600
Installation and Commissioning Manual
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