GE D90 Plus - Page 663

CHAPTER 15: THEORY OF OPERATION SINGLE-POLE TRIPPING
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 653
Figure 561: Single-pole operation
The trip output element receives requests for single-pole and three-pole trips and three-
pole reclose initiation. It then processes these requests to generate outputs that are used
to perform the following functions:
• Determine whether a single- or three-pole operation is to be performed
• Initiate tripping of breaker poles A, B, and C, either individually or as a group
• Initiate breaker failure protection for phases A, B, and C, either individually or as a
group
• Notify the open pole detector when a single-pole operation is imminent
• Initiate either single-pole or three-pole reclosing
• Notify the phase selector when a trip operation is imminent
When notified that a single-pole operation has been initiated, the open pole detector
performs the following functions:
• Initiates blocking of protection elements that potentially can misoperate when a
breaker pole is open
• Instructs the phase selector to de-assert all outputs, as an open pole invalidates
calculations
Single-pole operation on a line in a single breaker arrangement is described. The line is
protected by a D90
Plus
using the line pickup and zone 1 phase and ground distance
elements. It also implements a permissive overreaching transfer trip scheme using zone 2
phase and ground distance elements, as well as negative-sequence directional
overcurrent elements. Zone 1 is configured to issue a single-pole trip when appropriate:
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