CHAPTER 5: SETTINGS
GROUPED ELEMENTS
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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5
The ground instantaneous overcurrent element can be used as an instantaneous element with no intentional delay or as a
definite time element. The ground current input is the quantity measured by the ground input CT and is the fundamental
phasor magnitude.
Figure 5-112: Ground IOC1 logic
5.7.5.4 Restricted ground fault (ANSI 87RGF, IEC PNDF)
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
GROUND CURRENT
RESTRICTED GROUND FAULT
1(6)
Restricted ground fault (RGF) protection provides sensitive ground fault detection for low-magnitude fault currents,
primarily faults close to the neutral point of a wye-connected winding. An internal ground fault on an impedance grounded
wye winding produces a fault current dependent on the ground impedance value and the fault position on the winding
with respect to the neutral point. The resultant primary current is negligible for faults on the lower 30% of the winding
GROUND IOC1
EVENTS: Disabled
Range: Disabled, Enabled
These elements measure the current that is connected to the ground channel of a CT/VT module. The conversion
range of a standard channel is from 0.02 to 46 times the CT rating.
This channel can be equipped with a standard or sensitive input. The conversion range of a sensitive channel is
from 0.002 to 4.6 times the CT rating.
RESTRICTED GROUND
FAULT 1
RESTD GND FT1
FUNCTION: Disabled
Range: Disabled, Enabled
RESTD GND FT1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
RESTD GND FT1
PICKUP: 0.080 pu
Range: 0.005 to 30.000 pu in steps of 0.001
RESTD GND FT1
SLOPE: 40%
Range: 0 to 100% in steps of 1
RESTD GND FT1 PICKUP
DELAY: 0.10 s
Range: 0.00 to 600.00 s in steps of 0.01
RESTD GND FT1 RESET
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
RESTD GND FT1 BLOCK:
Off
Range: FlexLogic operand
RESTD GND FT1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
Содержание T35
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