Using Shared Operands In Protection - GE D90 Plus Instruction Manual

PROTECTION INPUTS AND OUTPUTS

Using shared operands in protection

400
Figure 344: Teleprotection input states
The following actual value is available for all 16 teleprotection inputs on channels 1 and 2.
Teleprotection Input 1 State
Range: Off, On, Latest/On, Latest/Off
This actual value displays the state of the teleprotection input on channels 1 and 2.
The "Latest/On" and "Latest/Off" values freeze the input in case of lost communication. If
the latest state is not known, such as after relay power-up but before the first
communication exchange, then the input defaults to logic 1 for "Latest/On" and logic 0
for "Latest/Off."
Plus
The EnerVista UR Setup software groups the D90
primary functions. Each function has its own settings and each generates its own outputs
in the form of operands.
• Communications
• Protection
• Automation
• Digital fault recorder (DFR)
• Metering
• Equipment manager
• Self-tests
• Front panel interface (HMI)
It is often desirable for an output from an element within one function to be available to an
element within another function. For example, it can be useful for the digital fault recorder
to record the output operands of any protection element. Consequently a fixed,
predetermined set of operands is available to each function, as shown.
Plus
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
system into the following eight