Autoreclose - GE D90 Plus Instruction Manual
Line distance protection system
Hide thumbs
Also See for D90 Plus:
- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
Table of Contents
Advertisement
CONTROL ELEMENTS
Autoreclose
338
Figure 277: Open pole detector logic, sheet 2 of 2
The autoreclose scheme is for use on transmission lines with circuit breakers operated in
both the single-pole and three-pole modes, in one or two breaker arrangements. The
autoreclose scheme provides four programs with different operating cycles, depending on
the fault type. Each of the four programs can be set to trigger up to four reclosing
attempts. The second, third, and fourth attempts always perform three-pole reclosing and
have independent dead time delays.
When used in two breaker applications, the reclosing sequence is selectable. The reclose
signal can be sent to one selected breaker only, to both breakers simultaneously or to both
breakers in sequence (one breaker first and then, after a delay to check that the reclose
was successful, to the second breaker). When reclosing in sequence, the first breaker
recloses with either the single-pole or three-pole dead time according to the fault type and
reclose mode; the second breaker follows the successful reclosure of the first breaker.
When reclosing simultaneously, for the first shot both breakers reclose with either the
single-pole or three-pole dead time, according to the fault type and the reclose mode.
The autoreclose function differs from that implemented in the UR series and needs to be
enabled. Do this setup on the front panel or using the software.
The signal used to initiate the autoreclose scheme is the trip output from protection. This
signal can be single-pole tripping for single-phase faults and three phase tripping for
multiphase faults. The autoreclose scheme has five operating states.
Table 18: Autoreclose operating states
State
Characteristics
Enabled
Scheme is permitted to operate
Disabled
Scheme is not permitted to operate
Reset
Scheme is permitted to operate and shot count is reset to 0
Reclose in
Scheme has been initiated but the reclose cycle is not finished (successful or
progress
not)
Lockout
Scheme is not permitted to operate until reset received
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
Advertisement
Table of Contents
