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1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
471
Technical Manual
6.7
Cable fault detection, CFD
6.7.1
Identification
6.7.2
Function block
Figure 251:
Function block
6.7.3
Functionality
The self-clearing fault detection function (CFD) calculates half cycle DFT of the current
signal for all the three phases and uses it to detect a self clearing fault pronounced primarily
in underground circuits.
The function provides individual counter values for number of times a self-clearing fault
is observed in each phase. The function also determines whether the self-clearing fault is
observed in all the three phases or not.
This function contains a blocking functionality. It is possible to block the function outputs,
or the function itself, if desired.
6.7.4
Operation principle
The
Operation
setting is used to enable or disable the function. When selected "On" the
function is enabled and respectively "Off" means function is disabled.
The operation of CFD can be described by using a module diagram (see Figure 252
below). All the modules in the diagram are explained in the next sections.
Function description
IEC 61850 identification
IEC 60617 identification
ANSI/IEEE C37.2
device number
Phase discontinuity protection
RCFD
RCFD
CFD
I_C
CFD
I_A
I_B
BLOCK
TRIP
PICKUP
Содержание 615 Series ANSI
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