5-92
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
5.4 PROTECTION ELEMENTS
CHAPTER 5: SETPOINTS
5.4.9.3 Wattmetric ground fault (32N)
This document specifies wattmetric zero-sequence directional function, which can be used on solidly grounded, low-
resistance grounded, isolated or resonant (Petersen coil) grounded systems. The function determines presence and
direction of ground faults by measuring value and direction of zero-sequence power.
The element responds to power derived from zero-sequence voltage and current in a direction specified by the element
characteristic angle. The angle can be set within all four quadrants, the power can be selected to be either active or
reactive. Therefore, the element may be used to sense either forward or reverse ground faults in either inductive,
capacitive or resistive networks. Inverse time characteristic allows time coordination of the elements across the network.
Typical applications include ground fault protection in solidly grounded transmission networks, grounded/ungrounded/
resistor-grounded/resonant-grounded distribution networks, or for directionalizing other non-directional ground elements.
Element settings
Function
:
Enables or disables the directional element.
Voltage Pickup Level:
The element uses neutral, i.e. 3 times zero-sequence, voltage. This setting specifies the
minimum neutral voltage supervising the directional power measurement. This threshold
should be higher than possible unbalance during normal operation of the system.
Current selection:
The element responds to the neutral (3 times zero-sequence) current, either calculated
internally (IN) from the phase currents, or supplied externally (IG) via the ground CT input. This
setting allows selecting the source of the operating current.
OC Pickup Level:
This setting specifies the current supervision level for the measurement of the zero-sequence
power.
OC Pickup Delay:
This setting specifies delay for the overcurrent portion of this element. The delay applies to
the 32N1(2 3) HIGH(LOW) OC PKP operand driven from the overcurrent condition.
Power Pickup:
This setting specifies the operating point of the element.
MTA:
This setting adjusts the maximum torque angle of the element.
SETPOINT > PROTECTION ELEMENT > SETTING GROUP X > POWER >
WATT GND FLT HIGH 1> WATT GND FLT HIGH 2 > WATT GND FLT HIGH 3
WATT GND FLT LOW 1> WATT GND FLT LOW 2 > WATT GND FLT LOW 3
SETTING DESCRIPTION
NAME
DEFAULT VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED-ENABLED]
Supervision minimun voltage
Voltage Pickup Level
2.00
0.01 V
[2.00 : 70.00]
Source of operating current.
Current selection
IN
N/A
[IN-IG]
Pickup Level for Overcurrent
OC Pickup Level
0.005
0.001A
[0.005 : 0.400]
Pickup Delay for Overcurrent
OC Pickup Delay
0.20
0.01 s
[0.00 : 600.00]
Pickup Level for operating Power
Power Pickup
0.01
0.01 W
[0.01 : 4.50]
Max torque angle
MTA
0
1 Deg
[0 : 360]
Pickup Delay for Operating Power
Power Pickup Delay
0.20
0.01 s
[0.00 : 600.00]
Curve shape
Curve
DEFINITE TIME
N/A
[DEFINITE TIME - INVERSE TIME - USER
CURVE A - USER CURVE B - USER
CURVE C - USER CURVE D]
Multiplier
Multiplier
1.00
0.01 s
[0.02 : 2.00]
Snapshot event generation
Snapshot Event
DISABLED
N/A
[DISABLED-ENABLED]
Summary of Contents for F650
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