4
SPEAR™ Single-Phase Recloser System
INSTALLATION AND OPERATION INSTRUCTIONS
MN280048EN June 2016
Theory of operation
A functional block diagram of the SPEAR single-phase
recloser control is shown in Figure 1. Current sensing is
provided by one current transformer located in the recloser
and interfaced to the SPEAR single-phase recloser control
via the control cable. This cable also supplies Trip, Close, and
Recloser status, and provides isolation for reliable operation.
Voltage for metering is connected to the control through the
cabinet harness.
Line current flowing through the recloser is converted
to a digital signal suitable for metering and fault current
calculations. Data sampling occurs at a rate of 20 times per
cycle. The control contains a data acquisition section that
uses the acquired samples to compute the fundamental
current and voltage for use in overcurrent protection, as well
as current and voltage for metering functions. The current
is calculated four times per cycle for overcurrent protection.
The current only includes the fundamental frequency
current and does not include harmonics.
When the phase current exceeds its programmed minimum-
trip value and associated time-current-curve (TCC) timing,
the control initiates the programmed sequence of recloser
tripping and reclosing operations. If the fault is temporary,
the control ceases to command recloser operations after a
successful reclose, and the control resets to the start of its
operating sequence after a preset time delay. If the fault is
permanent, the control performs its complete programmed
sequence of reclose commands and locks out with the
recloser open. Once locked out, the control must be closed
via the operator panel or SCADA communications. This
resets the control to the start of the operating sequence.
The following chain of events occurs for an operating
sequence of two trips to lockout (one trip on TCC1, one trip
on TCC2):
1. The overcurrent signal is integrated with time on the
selected curve for the first trip operation (TCC1) to
produce the signal which energizes the trip circuit.
2. Energizing the trip circuit connects the supply to the
trip coil to open the recloser.
3. Upon opening, the control starts timing on the first
reclosing interval-delay time.
4. Upon expiration of this reclosing interval-delay, a closing
signal is issued from the control, closing the recloser,
and selecting the time-current characteristics for the
second trip operation (TCC2).
5. If current remains above the minimum-trip level, the
recloser will trip on TCC2 and lockout the recloser.
Control front panel
The SPEAR single-phase recloser control front panel is
illustrated in Figure 2.
The front panel is separated into two clearly identified, color-
coded sections:
●
●
Programming Panel: The top portion of the front panel
is used for programming the control and providing LED
status indication.
●
●
Operating Panel: The lower portion of the front operating
panel is used for operating the control and recloser.
The control includes a Power Save feature that will turn
off the LEDs and backlit LCD display after 15 minutes
of inactivity at the front panel (no buttons pressed). The
CONTROL OK and HOT LINE TAG LEDs are not affected by
the power save mode. Pressing any key on the front panel
will turn the LCD backlight on and restore all LEDs to their
current on/off states.
The control includes a Reset Menu feature that will cause
the LCD display to revert to the root menu after 15 minutes
of inactivity.
Figure 2 .
DATA PORT
ENTER
EDIT
ESC
BATTERY
TEST
SUPER-
VISORY
OFF
NON
RECLOSE
HOT LINE
TAG
TRIP
OFF
(LOCKOUT)
CLOSE
SPEAR Single-Phase Recloser Control
ON
ALT
PROFILE
PHASE
FAULT
ABOVE MIN TRIP
ALARM
CONTROL OK
AC POWER
BATTERY
LOCKOUT
OPEN
CLOSED
→*
SETTINGS
*
SEQUENCE OF
EVENTS
*
METERING
SPEAR single-phase recloser control front
panel
