GE C60 Instruction Manual

Also see for C60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

CHAPTER 5: SETTINGS CONTROL ELEMENTSC60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2795• The shot counter is not at 0; that is, the scheme is not in the reset state. This ensures a second trip is three-pole whenreclosing onto a permanent single phase fault.• 1.25 cycles after the single-pole reclose is initiated by the AR 1P INIT signalZone 1 extentThe zone 1 extension philosophy here is to apply an overreaching zone permanently as long as the relay is ready toreclose, and reduce the reach when reclosing. Another zone 1 extension approach is to operate normally from anunderreaching zone, and use an overreaching distance zone when reclosing the line with the other line end open. Thisphilosophy can be programmed via the line pickup scheme.The “Extended Zone 1" is 0 when autoreclose is in lockout or disabled and 1 when autoreclose is in reset.• When "Extended Zone 1" is 0, the distance functions are set to normal underreach Zone 1 setting• When "Extended Zone 1" is 1, the distance functions can be set to Extended Zone 1 Reach, which is an overreachingsetting• During a reclose cycle, "Extended Zone 1" goes to 0 as soon as the first CLOSE BREAKER signal is issued (AR SHOT COUNT> 0) and remains 0 until the recloser goes back to resetSettingsThe single-phase autoreclose settings are as follows.AR MODE — This setting selects the Autoreclose operating mode from the four available reclose modes (Mode 1: 1 & 3 Pole,Mode 2: 1 Pole, Mode 3: 3 Pole-A and Mode 4: 3 Pole-B), which functions in conjunction with signals received at the initiationinputs as described. The autorecloser runs in this mode until a different mode is activated through the AR Mode Activationinputs explained as follows.Mode 1 to Mode 4 Activation — This setting selects an operand for activating the corresponding AR mode in runtime. Modechange via activation input takes place when only one of the four activation inputs is high and the AR RIP operand is low(that is, reclose is not in progress) and also the mode to be activated is different from the existing mode, otherwise theactivation input is ignored and the existing mode continues to be used. See details in the Mode Control Logic diagram.AR MAX NUMBER OF SHOTS — This setting specifies the number of reclosures that can be attempted before reclosure goes tolockout when the fault is permanent.AR INITIATE MODE — This setting selects the autoreclose initiation mode. When selected as “Protection AND CB,” theautoreclose element is initiated by protection operation and begins incrementing the autoreclose dead time timer when acircuit breaker is open. Breaker status is determined from breaker auxiliary contacts which need to be correctly configuredin breaker settings. In “Protection only” initiation mode, the autoreclose element is initiated by protection operation andbegins incrementing the dead time when protection resets, without the need of breaker auxiliary contacts.AR BLOCK BKR1 — This input selects an operand that blocks the reclose command for breaker 1. This condition can be forexample: breaker low air pressure, reclose in progress on another line (for the central breaker in a breaker and a halfarrangement), or a sum of conditions combined in FlexLogic.AR CLOSE TIME BKR1 — This setting represents the closing time for the breaker 1 from the moment the "Close" command issent to the moment the breaker contacts are closed in the "Protection AND CB" mode or when Open Pole is reset in the"Protection only" mode. In the "Protection Only" mode, AR1 CLOSE BRK 1 is reset if either protection operates again in thecase of the unsuccessful reclose attempt or 20 ms after Open Pole is reset in case of the successful reclosure attempt.AR BKR MAN CLOSE — This setting selects a FlexLogic operand that represents manual close command to a breakerassociated with the autoreclose scheme.AR BLK TIME UPON MAN CLS — The autoreclose scheme can be disabled for a programmable time delay after an associatedcircuit breaker is manually commanded to close, preventing reclosing onto an existing fault such as grounds on the line.This delay must be longer than the slowest expected trip from any protection not blocked after manual closing. If theautoreclose scheme is not initiated after a manual close and this time expires the autoreclose scheme is set to the resetstate.AR 1P INIT — This setting selects a FlexLogic operand that is intended to initiate single-pole autoreclosure.AR 3P INIT — This setting selects a FlexLogic operand that is intended to initiate three-pole autoreclosure, first timer (AR 3PDEAD TIME 1) that can be used for a high-speed autoreclosure.