Sensitive Ground Current - GE Multilin F650 Instruction Manual

5.4 PROTECTION ELEMENTS
Operation Direction (Direction): This setpoint indicates the Direction for which the unit will allow a trip. Depending on
Polarization Voltage Threshold (Pol. V Threshold):This is the minimum polarization voltage threshold, for a voltage
Snapshot Events:
Sensitive ground directional element is an independent Protection unit that provides block and Operation signals. These
signals can be monitored both through the relay HMI or using EnerVista 650 Setup at "Actual > Status > Protection >

Sensitive Ground Current"

67SG Block (SENS GND DIR1 BLOCK): It indicates that the unit is blocked by digital input or because the Operation
magnitude (In current), or the Polarization magnitude (Vn voltage and/or Ip current) level is too low.
67SG Operation (SENS GND DIR1 OP): It indicates that the directional unit is giving permission, that the angle relations
between the operation magnitude and the polarization magnitude are met, according to the set conditions, or in case of
having selected Permission in the Block Logic setpoint, it indicates that the unit allows operation under block conditions.
5
Configuration of the required signals for blocking the sensitive ground overcurrent units from the signals provided by the
sensitive ground directional units is performed at Setpoint > Relay Configuration > Protection Elements using the
inverted operation signals to block the trip, as shown in the following example:
For example, to block sensitive Ground time overcurrent units, use the following signals:
SENS GND TOC1 BLOCK = NOT (SENS GND DIR1 OP)
SENS GND TOC2 BLOCK = NOT (SENS GND DIR2 OP)
SENS GND TOC3 BLOCK = NOT (SENS GND DIR3 OP)
To block Ground instantaneous units:
SENS GND IOC1 BLOCK = NOT (SENS GND DIR1 OP)
SENS GND IOC2 BLOCK = NOT (SENS GND DIR2 OP)
SENS GND IOC3 BLOCK = NOT (SENS GND DIR3 OP)
To block isolated Ground units:
ISOLATED GND1 BLK = NOT (SENS GND DIR1 OP)
ISOLATED GND2 BLK = NOT (SENS GND DIR2 OP)
ISOLATED GND3 BLK = NOT (SENS GND DIR3 OP)
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this setpoint, the unit will be activated for faults in a direction or in the opposite direction.
Possible setpoint values are FORWARD or REVERSE.
value lower than this setpoint the directional unit will be blocked.
The snapshot event setpoint enables or disables the snapshot event generation for this
unit.
SENS GND DIRECTIONAL
SENS GND DIR1 BLOCK
SENS GND DIR1 OP
SENS GND DIR2 BLOCK
SENS GND DIR2 OP
SENS GND DIR3 BLOCK
SENS GND DIR3 OP
F650 Digital Bay Controller
5 SETPOINTS
GE Multilin