Directional Elements (67N, 67G); Element - GE Multilin G650 Manual

9.12 DIRECTIONAL ELEMENTS (67N, 67G)

9.12DIRECTIONAL ELEMENTS (67N, 67G)
In order to test directional units in the relay, instantaneous trips will be commanded.
Two points will be tested, per phase, test element.
In order to test the directional units, configure (in the "Setpoint > Relay Configuration > Protection Elements" screen of
the EnerVista 650 Setup program), some overcurrent element to be supervised by a directional unit. This way, if the
directional element is enabled and detects the fault in the block direction, then the overcurrent unit will not operate. If the
directional element is not enabled or if it is enabled and it detects a fault in a trip direction, then the overcurrent unit will
operate if the set current level is exceeded.
Activate only protection elements 50N and 67N and set the relay as follows:
67N SETTINGS
Function
MTA
Direction
Polarization
Block Logic
Pol V Threshold
Configure one of the outputs to be activated only by unit
Apply the following tests:
ELEMENTS
50N/67N
9
9-14
ENABLED
-45 Deg
FORWARD
VO
PERMISSION
10 V
50G.
PHASE UNDER TEST POLARIZATION PHASE
CHANNEL MAGNITUDE CHANNEL
MOD ARG
IA 2 A 0º VI
IB 0 A 0º VII
IC 0 A 0º VIII
G650 Generator Protection & Control System
50N SETTINGS
Function
Input
Pickup Level
Trip Delay
Reset Delay
ELEMENT TRIP
MAGNITUDE
MOD ARG
60 V 0º NO
60 V 180º YES
0 V 0º
0 V 0º
9 COMMISSIONING
9.12.1 67N ELEMENT
ENABLED
PHASOR (DFT)
0.50 A
0.30
0.00
GEK-113285A