Grid1 And Grid2 Parameters - GE PACSystems RX3i User Manual

Grid1 and Grid2 Parameters

GFK-2749
The Grid1 tab is used to set the parameters for GRID 1 (Public Grid/Load 1).
The Grid 2 tab is used to set the parameters for GRID 2 (Generator Grid/load 2)
These parameters include the gain and offset calibration constants required for the
module and the gain calibration constant of each of the input channels. These calibration
constants are on the side label of the PSM module and on the front plate of the Terminal
Assembly. There are two sets of the voltage channel (VA, VB and VC) gain constants
because there are two voltage ranges available for the user.
The other parameters select the nominal values of the voltages, currents and frequencies
that will be used by the ANSI functions to monitor voltage, current, power and frequency
deviations to set and clear alarms.
Parameter
Voltage Selection
Nominal Voltage [Volts]
Nominal Current [Amps]
Nominal Frequency [Hz]
Chapter 3 Configuration and Data Transfer
Function
Select 120 for input voltages in the 45-150 VAC range.
Select 600 for voltages in the 120 to 690 VAC range.
The Voltage Selection must match both the physical cable
connection to the IC694ACC200 terminal assembly and the
%Q offset 2 (Grid 1) and %Q offset 18 (Grid 2) configuration
bits. Refer to chapter 2 for proper wiring and configuration
information.
Enter the actual voltage expected on the grid.
This value is used by the ANSI calculations to determine
under/over voltage, VI imbalance and in setting the fault
status bits.
Range and Default: Depends on Voltage Selection
Enter the maximum anticipated current delivered by the
external Current Transformers.
All process currents must be scaled to a value of 5 Amps or
less. This value is used by the ANSI calculations to
determine overcurrent, VI Imbalance and in setting the fault
status bits.
Note: Setting a negative Nominal Current value implies
that the IC694ACC200 grid inputs are connected to
a load (drawing power) instead of a power source
(producing power). The power and energy values
will be reported as negative numbers. The CTs
must be wired with the correct polarity to achieve
the negative power and energy values. You are
responsible for the correct PTs/CTs connections to
obtain the negative sign of each reported phase
(and the total) active power.
RMS current is necessarily reported as a positive
number, due to the RMS calculations
Range: -7.5 to 7.5
Default: 5.0
Select the steady-state frequency of the grid.
This value is used by the ANSI calculations to determine
under/over frequency.
Choices: 50, 60
Default: 60
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