GE Multilin GEK-113000T User Manual

GE Multilin F650 Digital Bay Controller 5-51
5 SETPOINTS 5.4 PROTECTION ELEMENTS
5
5.4.4.3 NEUTRAL DIRECTIONAL UNIT (67N)
The neutral directional unit is used for supervising the neutral (3I0) overcurrent units, calculated from the phase currents
as operation magnitude, in order to discriminate the fault direction. This unit can be set to use either the neutral voltage
(3V0), or the polarization current measured by the 5
th
current input (Ip), or both of them as polarization magnitude.
Table 5–46: 67N UNIT SETPOINTS
setpoints for this unit are:
Maximum Torque Angle (MTA): angle used to rotate the polarization voltage. Positive angles are counter clockwise
rotations, and negative angles are counter clockwise rotations. The polarization
magnitude, once rotated, defines the MTA line. Vn rotated this angle points the semi
plane that corresponds to a Reverse fault. -Vn rotated this angle points the semi
plane that corresponds to a Forward fault. A typical setpoint can be –45º.
Directional unit direction (Direction)
: This setpoint indicates the Direction for which the unit will allow a trip. Depending
on this setpoint, the unit will be activated for faults in a direction, or on the opposite
direction, allowing its use in tripping or blocking schemes. Possible options for this
setpoint are FORWARD and REVERSE.
Polarization type (Polarization): This setpoint indicates the type of Polarization to be used. The relay can use voltage
polarization (V0), and/or current polarization (Ip). Possible setpoint values are:
V0 Voltage polarization
Ip Current polarization
V0 + Ip Voltage or current polarization, allows the unit to operate when
any of the polarization magnitudes allow operation.
V0 * Ip Voltage and current polarization, allows the unit to operate when
both polarization magnitudes allow operation.
If the selected polarization type is V0+Ip, then the relay will operate when any of the
polarization magnitudes indicate the selected direction in the Direction setpoint.
If the selected polarization type is V0*Ip, then the relay will only operate when both
polarization magnitudes indicate the selected direction in the Direction setpoint.
Polarization Voltage Threshold this is the minimum voltage considered for the direction calculation. Under this
setpoint, the unit will be blocked.
Snapshot Events: The snapshot event setpoint enables or disables the snapshot event generation for
this units.
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL DIRECTIONAL >
NEUTRAL DIRECTIONAL 1> NEUTRAL DIRECTIONAL 2 > NEUTRAL DIRECTIONAL 3
SETPOINT DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Maximum Torque Angle MTA -45 1 Deg [-90 : +90]
Operation Direction Direction FORWARD N/A [FORWARD – REVERSE]
Polarization type Polarization VO N/A [V
0
– I
P
– V
0
+I
P
– V
0
*I
P
]
Block logic type Block Logic PERMISSION N/A [BLOCK – PERMISSION]
Polarization voltage threshold Pol V Threshold 10 1 V [0 : 300]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]

GE Multilin GEK-113000T Specifications

General

Brand	GE
Model	Multilin GEK-113000T
Category	Controller
Language	English