Hardware Architecture - GE D90 Plus Instruction Manual

CHAPTER 2: PRODUCT DESCRIPTION

Hardware architecture

PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Plus
The D90 also includes shared operand functionality. Output signals from the various
functions can be assigned as shared operands available to all functions. These signals can
then be assigned as inputs within other functions.
For example, assume that the
signal within the automation function. This signal is then assigned as a shared operand. As
such, the operand subsequently becomes available to the automation
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function by appearing in the list of available operands.
The unit is a microprocessor-based device. It has a modular design, its chassis containing
discrete modules that interface over a common bus. Each module has a specific purpose.
Several modules are required for basic operation of the device, while others are optional.
The power supply module receives AC or DC power from an external supply and produces
conditioned 12 V DC power for all modules in the chassis. The power supply also generates
48 V DC power for external contact wetting. The output contact indicating a critical failure
of the unit also resides on this module.
Figure 1: Functional architecture
protection FlexLogic operand is required as a
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PRODUCT DESCRIPTION
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