System Setup; Ac Inputs - GE N60 Instruction Manual

SYSTEM SETUP

The remote resources settings configure a N60 with a process bus module to work with HardFiber Bricks. Remote
resources configuration is only available through the EnerVista software, and is not available through the N60 front panel.
A Brick provides eight AC measurements, along with contact inputs, DC analog inputs, and contact outputs, to be the
remote interface to field equipment such as circuit breakers and transformers. The N60 with a process bus module has
access to all of the capabilities of up to eight Bricks. Remote resources settings configure the point-to-point connection
between specific fiber optic ports on the N60 process card and specific Brick. The relay is then configured to measure
specific currents, voltages and contact inputs from those Bricks, and to control specific outputs.
The configuration process for remote resources is straightforward and consists of the following steps.
• Configure the field units. This establishes the point-to-point connection between a specific port on the relay process
bus module, and a specific digital core on a specific Brick. This is a necessary first step in configuring a process bus
relay.
• Configure the AC banks. This sets the primary and secondary quantities and connections for currents and voltages. AC
bank configuration also provides a provision for redundant measurements for currents and voltages, a powerful
reliability improvement possible with process bus.
• Configure signal sources. This functionality of the N60 has not changed other than the requirement to use currents
and voltages established by AC bank configuration under the remote resources menu.
• Configure field contact inputs, field contact outputs, RTDs, and transducers as required for the application's
functionality. These inputs and outputs are the physical interface to circuit breakers, transformers, and other
equipment. They replace the traditional contact inputs and outputs located at the relay to virtually eliminate copper
wiring.
• Configure shared inputs and outputs as required for the application's functionality. Shared inputs and outputs are
distinct binary channels that provide high-speed protection quality signaling between relays through a Brick.
For additional information on how to configure a relay with a process bus module, see the HardFiber Process Bus System
5
Instruction Manual.
5.5 System setup

5.5.1 AC inputs

5.5.1.1 Current banks
SETTINGS  SYSTEM SETUP  AC INPUTS  CURRENT BANK F1
 CURRENT BANK F1

Six banks of phase and ground CTs can be set, where the current banks are denoted in the following format (X represents
the module slot position letter):
Xa, where X = {F, M, U} and a = {1, 5}
See the Introduction to AC Sources section at the beginning of this chapter for details.
These settings are critical for all features that have settings dependent on current measurements. When the relay is
ordered, the CT module must be specified to include a standard or sensitive ground input. As the phase CTs are connected
in wye (star), the calculated phasor sum of the three phase currents (IA + IB + IC = neutral current = 3Io) is used as the input
for the neutral overcurrent elements. In addition, a zero-sequence (core balance) CT which senses current in all of the
5-112
PHASE CT F1

PRIMARY: 1 A
PHASE CT F1

SECONDARY: 1 A
GROUND CT F1

PRIMARY: 1 A
GROUND CT F1

SECONDARY: 1 A
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Range: 1 to 65000 A in steps of 1
Range: 1 A, 5 A
Range: 1 to 65000 A in steps of 1
Range: 1 A, 5 A