GE D90 Plus Instruction Manual page 16

PRODUCT DESCRIPTION
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The AC module measures AC currents and voltages derived from CTs and VTs. These
signals are sampled and digitized and sent over the device's bus to the CPU module for
further processing. A version is available that accepts nominal 5 A current and another
that accepts nominal 1 A current.
Input and output modules monitor digital (on and off) signals from external devices (field
contacts or other IEDs), control external devices such as breakers, and send digital signals
to other devices. Input and output modules are subdivided into protection inputs and
outputs and automation inputs and outputs, with several variations of each type.
The CPU module contains the firmware for the D90
algorithms required for the various functions provided by the device. The CPU receives
analog and digital data from the AC and input/output modules. The CPU processes the
data and resulting control actions are sent back to the input-output modules. The CPU has
one rear Ethernet port that is used for configuration and record retrieval and one rear
RS485 port supporting the Modbus and DNP protocols. The CPU also contains the IRIG-B
port required for clock synchronization.
The communications module is required for communicating with external devices over
Ethernet using the trivial file transfer protocol (TFTP), HTTP, Parallel Redundancy Protocol
(PTP), IEC 61850, DNP 3.0, or IEC60870-5-104 protocol. This module is also required for
peer-to-peer GSSE/GOOSE messaging. This module contains its own microprocessor that is
dedicated to handling communications tasks. It also contains two redundant Ethernet
ports. Each port supports 100Base-FX over multi-mode fiber and 10/100Base-TX over
twisted pair, with auto-negotiation. These ports can additionally be configured for single IP
or dual IP redundancy.
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The D90 requires one power supply module, one CPU module, one AC module, and at
least one protection input/output module. Communications modules are optional.
The front panel interface consists of an annunciator display, a main display, and an
EnerVista USB port. The annunciator display collects alarm indications from the
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D90 internal functions and presents them using a standard annunciator format. Alarms
and their corresponding messages are entirely user-configurable. The main display allows
the user to view metering data collected by the D90
control functions via dedicated control pushbuttons. The USB port allows the user to
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interface with the D90 using the EnerVista software running on a computer.
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. The firmware contains the
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D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: PRODUCT DESCRIPTION
. It also provides access to the