Trip Output - GE D90 Plus Instruction Manual

CONTROL ELEMENTS

Trip output

Three-pole operation
Single-pole operation
NOTE:
Trip output settings
276
The trip output element is primarily used to collect trip requests from protection elements
and other inputs to generate output operands to initiate trip operations. Three-pole trips
will only initiate reclosure if programmed to do so, whereas single-pole trips will always
automatically initiate reclosure. The
be used as inputs to a FlexLogic™ OR gate to operate the front panel annunciator.
In applications where single-pole tripping is not required, the trip output element provides
a convenient method of collecting inputs to initiate tripping of circuit breakers, the reclose
element, and breaker failure elements.
This element must be used in single-pole operation applications.
The trip output element performs the following applications for single-pole operations.
• Determines if a single-pole operation should be performed.
• Collects inputs to initiate three-pole tripping, the autorecloser, and breaker failure
elements.
• Collects inputs to initiate single-pole tripping, the autorecloser, and breaker failure
elements.
• Assigns a higher priority to pilot-aided scheme outputs than to exclusively local inputs.
The trip output element works in association with the following D90
• Autoreclose.
• Breaker control.
• Open pole detector.
• Phase selector.
These elements must be programmed and in-service for successful operation of the trip
output. The autorecloser must also be in the reset state before a single-pole trip can be
issued. Outputs from this element are also directly connected as initiate signals to the
breaker failure elements.
At least one internal protection element or digital input representing detection of a fault
must be available as an input to this element. In pilot-aided scheme applications a timer
can be used to delay the output decision until data from a remote terminal is received from
communications facilities. This prevents a three-pole operation when a single-pole
operation is permitted.
Select the Settings > Protection > Control > Trip Output menu item to access the trip
output settings.
and
TRIP 3-POLE TRIP 1-POLE
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
output operands can also
Plus
elements.