GE N60 Instruction Manual

Also see for N60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

5-112 N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUALSYSTEM SETUP CHAPTER 5: SETTINGS5The remote resources settings configure a N60 with a process bus module to work with HardFiber Bricks. Remoteresources 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 theremote interface to field equipment such as circuit breakers and transformers. The N60 with a process bus module hasaccess to all of the capabilities of up to eight Bricks. Remote resources settings configure the point-to-point connectionbetween specific fiber optic ports on the N60 process card and specific Brick. The relay is then configured to measurespecific 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 processbus module, and a specific digital core on a specific Brick. This is a necessary first step in configuring a process busrelay.• Configure the AC banks. This sets the primary and secondary quantities and connections for currents and voltages. ACbank configuration also provides a provision for redundant measurements for currents and voltages, a powerfulreliability improvement possible with process bus.• Configure signal sources. This functionality of the N60 has not changed other than the requirement to use currentsand 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'sfunctionality. These inputs and outputs are the physical interface to circuit breakers, transformers, and otherequipment. They replace the traditional contact inputs and outputs located at the relay to virtually eliminate copperwiring.• Configure shared inputs and outputs as required for the application's functionality. Shared inputs and outputs aredistinct 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 SystemInstruction Manual.5.5 System setup5.5.1 AC inputs5.5.1.1 Current banksSETTINGS  SYSTEM SETUP  AC INPUTS  CURRENT BANK F1Six banks of phase and ground CTs can be set, where the current banks are denoted in the following format (X representsthe 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 isordered, the CT module must be specified to include a standard or sensitive ground input. As the phase CTs are connectedin wye (star), the calculated phasor sum of the three phase currents (IA + IB + IC = neutral current = 3Io) is used as the inputfor the neutral overcurrent elements. In addition, a zero-sequence (core balance) CT which senses current in all of the CURRENT BANK F1  PHASE CT F1PRIMARY: 1 ARange: 1 to 65000 A in steps of 1 PHASE CT F1SECONDARY: 1 ARange: 1 A, 5 A GROUND CT F1PRIMARY: 1 ARange: 1 to 65000 A in steps of 1 GROUND CT F1SECONDARY: 1 ARange: 1 A, 5 A