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5-302

L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL

CONTROL ELEMENTS

CHAPTER 5: SETTINGS

Table 5-39: Autoreclose programs

The four autoreclose modes are described as follows:
•

1 & 3 Pole

— In this mode, the autorecloser starts the

AR 1-P DEAD TIME

timer for the first shot if the autoreclose is

single-phase initiated, the

AR 3-P DEAD TIME 1

timer if the autoreclose is three-pole initiated, and the

AR 3-P DEAD TIME 2

timer if the autoreclose is three-phase time delay initiated. If two or more shots are enabled, the second, third, and
fourth shots are always three-pole and start the

AR 3-P DEAD TIME 2(4)

timers.

•

1 Pole

— In this mode, the autorecloser starts the

AR 1-P DEAD TIME

for the first shot if the fault is single phase. If the

fault is three-phase or a three-pole trip on the breaker occurred during the single-pole initiation, the scheme goes to
lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are always three-pole
and start the

AR 3-P DEAD TIME 2(4)

timers.

•

3 Pole-A

— In this mode, the autorecloser is initiated only for single phase faults, although the trip is three pole. The

autorecloser uses the

AR 3-P DEAD TIME 1

for the first shot if the fault is single phase. If the fault is multi phase the

scheme goes to Lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are
always three-phase and start the

AR 3-P DEAD TIME 2(4)

timers.

•

3 Pole-B

— In this mode, the autorecloser is initiated for any type of fault and starts the

AR 3-P DEAD TIME 1

for the first

shot. If the initiating signal is

AR 3P TD INIT

the scheme starts

AR 3-P DEAD TIME 2

for the first shot. If two or more shots

are enabled, the second, third, and fourth shots are always three-phase and start the

AR 3-P DEAD TIME 2(4)

timers.

Basic reclosing operation

Reclosing operation is determined primarily by the

AR MODE

and

AR BKR SEQUENCE

settings. The reclosing sequences are

started by the initiate inputs. A reclose initiate signal sends the scheme into the reclose-in-progress (RIP) state, asserting
the

AR RIP

FlexLogic operand. The scheme is latched into the RIP state and resets only when an

AR CLS BKR 1

(autoreclose

breaker 1) or

AR CLS BKR 2

(autoreclose breaker 2) operand is generated or the scheme goes to the Lockout state.

The dead time for the initial reclose operation is determined by the

AR 1-P DEAD TIME

AR 3-P DEAD TIME 1

, or

AR 3-P DEAD

TIME 2

setting, depending on the fault type and the mode selected. After the dead time interval the scheme asserts the

CLOSE BKR 1

AR CLOSE BKR 2

operands, as determined by the sequence selected. These operands are latched until the

breaker closes or the scheme goes to Reset or Lockout.
There are three initiate programs: single pole initiate, three pole initiate, and three pole time delay initiate. Any of these
reclose initiate signals start the reclose cycle and set the reclose-in-progress (

AR RIP

) operand. The reclose-in-progress

operand is sealed-in until the Lockout or Reset signal appears.
The three-pole initiate and three-pole time delay initiate signals are latched until the

AR CLOSE BKR1

AR CLOSE BKR2

, Lockout,

or Reset signal appears.

Autoreclose pause

The pause input offers the possibility of freezing the autoreclose cycle until the pause signal disappears. This can be done
when a trip occurs and simultaneously or previously, some conditions are detected such as out-of step or loss of guard
frequency, or a remote transfer trip signal is received. The pause signal freezes all four dead timers. When the ‘pause’
signal disappears the autoreclose cycle is resumed by continuing the shot timer it was left at when paused.

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