9-14 G650 Generator Protection & Control System GEK-113285A
9.12 DIRECTIONAL ELEMENTS (67N, 67G) 9 COMMISSIONING
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.
9.12.1 67N ELEMENT
Activate only protection elements 50N and 67N and set the relay as follows:
Configure one of the outputs to be activated only by unit 50G.
Apply the following tests:
67N SETTINGS 50N SETTINGS
Function ENABLED Function ENABLED
MTA -45 Deg Input PHASOR (DFT)
Direction FORWARD Pickup Level 0.50 A
Polarization VO Trip Delay 0.30
Block Logic PERMISSION Reset Delay 0.00
Pol V Threshold 10 V
ELEMENTS PHASE UNDER TEST POLARIZATION PHASE ELEMENT TRIP
CHANNEL MAGNITUDE CHANNEL MAGNITUDE
MOD ARG MOD ARG
50N/67N IA 2 A 0º VI 60 V 0º NO
60 V 180º YES
IB 0 A 0º VII 0 V 0º
IC 0 A 0º VIII 0 V 0º
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