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1.10 RECLOSER (OPTIONAL)
1.10 RECLOSER (OPTIONAL)
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The optional recloser can be used with the LPS-D alone, separately with an external relay system, or it can be
used simultaneously with the LPS-D and an external relay system. It can be used in single-pole or three-pole
tripping applications to provide up to 4 reclose attempts. When used in single-pole tripping and reclosing appli-
cations, the recloser requires the following inputs from the associated relays system(s):
1. A single-pole reclose input (1PRI) following tripping for single-line-to-ground faults
2. A three-pole reclose input (3PRI) following tripping for multi-phase faults.
The LPS-D produces these inputs internally. The external relay system, if used, must be capable of producing
the 1PRI and 3PRI signals as contact outputs for use as inputs into the recloser.
The recloser can be set to operate in one of the following modes (Protection Setting 1801: RECLMODE):
1. NONE: No reclosing is selected. The three-pole trip enable signal (see outputs) will not be set up at this
time. This mode should be selected when the LPS-D recloser is not used.
2. INTERNAL: Reclosing will be controlled by the LPS-D relay only. No external inputs will be recognized.
3. EXTERNAL: Reclosing will be controlled by external inputs (from other relays/systems) only. Inputs from
the LPS-D will be ignored.
4. BOTH: Reclosing will be controlled by signals from the LPS-D as well as from external inputs (other relays/
systems).
5. OFF: No reclosing, either by internal or external control, is allowed. The three-pole trip enable output (see
outputs) will be set up at this time. This mode should be selected when automatic reclosing is disabled.
When reclosing is selected, the recloser can be set to operate in one of the following programs (Protection Set-
ting 1802: RECLTYPE):
1. 1POLE. In this mode of operation, up to four reclosing attempts can be made following an initial single
phase trip; there will be no reclosing following an initial three phase trip. The first reclosing attempt requires
a 1PRI input, thus indicating that single-pole tripping was initiated. Each subsequent reclose (if used)
requires a 3PRI signal. Following the initial single-pole reclose, a three-pole trip enable signal is issued so
that if a fault is closed into, the relay system(s) will initiate three-pole tripping of the breaker regardless of
the fault type. This three-pole trip enable signal is issued internally to the LPS-D, but it must be pro-
grammed to drive one of the output relays for use with an external relay system, if such a relay system is
used with the recloser. Four separate timers are provided so that each of the reclosing attempts can be set
with a different time if required. For proper operation of the recloser in the 1POLE program, the LPS-D
must be programmed for single phase tripping (Protection Setting 1203: TRIPMODE = 1POL or 1POLZ2).
2. 3POLE. In this mode of operation, up to four reclosing attempts (all three-pole) can be made following an
initial three phase trip; there will be no reclosing following an initial single phase trip. Each reclosing
attempt requires a 3PRI signal that indicates three-pole tripping was initiated. In this mode, the three-pole
trip enable signal will be issued at all times, so that the relays will issue a three-pole trip signal to trip all
three poles of the breaker regardless of the fault type. This three-pole trip enable signal is issued internally
to the LPS-D system, but it must be programmed to drive one of the output relays for use with an external
relay system, if such a relay system is used with the recloser. Four separate timers are provided so that
each of the four reclosing attempts can be set with a different time if required. For proper operation of the
recloser in the 3POLE program, the LPS-D must be programmed for three phase tripping (Protection Set-
ting 1203: TRIPMODE = 3POL).
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42
LPS-D Line Protection System
1 PRODUCT DESCRIPTION
1.10.1 DESCRIPTION
1.10.2 RECLOSING MODE
1.10.3 RECLOSING PROGRAMS
GE Power Management
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