GE D90 Plus Instruction Manual page 30
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (688 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
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DEVICE OVERVIEW
Overfrequency and underfrequency protection
Overcurrent functions
Autoreclose
Breaker failure
Multi-breaker configurations
20
The multiple stages of underfrequency and over frequency elements can be used to
initiate load shedding or remedial actions schemes or frequency-based load restoration
schemes during lack of generation in the network or due to sudden load drops. When
combined with the advanced automation capabilities of the D90
protection schemes can be built.
For additional information, refer to:
Underfrequency
on page 358
Overfrequency
on page 360
Plus
The D90
provides overcurrent functions for phase, neutral, and ground which can run
parallel with distance protection or can be programmed to provide primary protection
under conditions when distance elements are blocked during fuse-failure conditions.
•
Instantaneous and timed overcurrent elements for phase, neutral, ground, and
negative-sequence protection.
•
Directional supervision is available for phase, neutral, and negative-sequence
elements.
•
Time overcurrent elements can individually be set to use IEEE, IEC, or custom
FlexCurves™.
For additional information, refer to:
Current elements
on page 226
Plus
The D90
provides multi-shot autoreclosing for single-pole or three-pole autoreclose on
all types of faults with independently programmable dead times for each shot.
Autoreclosing also can be dynamically blocked by user programmable logic. Four different
autoreclose modes are available enabling the users to select the reclosing mode of their
practice.
For additional information, refer to:
Autoreclose
on page 335
Plus
The D90
can be used to carry out fully independent breaker failure protection over the
breakers associated to the line when connected to a substation with a breaker-and-a-half
or ring bus arrangement. The D90
inputs and outputs, and elements to perform two independent breaker failure functions.
For additional information, refer to:
Breaker failure
on page 273
Plus
The D90
supports multi-breaker busbar configurations such as breaker-and-a-half or
ring bus arrangements, providing dual breaker autoreclose, dual synchrocheck elements,
and dual independent breaker failure elements.
Plus
provides the required current source inputs, digital
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: PRODUCT DESCRIPTION
Plus
, flexible special
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