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7
1 INTRODUCTION
1.1 Overview
The
OPTI
mizer
2
is an On-Line Circuit Breaker
Performance and SF
6
Gas Density Monitor that is used
for implementing predictive maintenance, maintenance
deferral, just-in-time (JIT) maintenance and environmental
protection. This intelligent electronic device (IED) monitors
the condition of the main contacts, mechanism and
dielectric; and logs the following information during CB
operation:
• Trip Time (mS) (also known as Opening Time)
• Arc duration (mS) (phase segregated)
• Clearing Time (mS) (also known as Interrupting Time)
• Cumulative I
2
x T or I x T on the main contacts (phase-
segregated) from arcing
• Restrike Occurrence (phase segregated)
• Mechanism opening travel time (mS)
• Mechanism closing travel time (mS)
• Operation Counts
The
OPTI
mizer
2
continuously monitors SF
6
(Sulfur
hexafluoride) gas density and temperature, and then
calculates gas pressure, density and pressure trend rates
and changes in mass. The present density, pressure,
mass, density and pressure trend rates, and temperature
are recorded in the history log at regular intervals. There
are alarms for low density and high density or pressure
trend rate.
In addition to alarming of anomalies by LEDs and contact
alarms, digital information is available for retrieval through
a DNP3.0 network or a web browser. The ability to provide
historical data, in addition to alarming at setpoints, makes
the
OPTI
mizer
2
ideal for reliability centered maintenance
(RCM) programs.
The
OPTI
mizer
2
has passed rigorous standards for
survivability in the electric utility substation environment. It
may be mounted directly in the circuit breaker cabinet, or
in the control house.
A minimal interface to the breaker control and secondary
current circuits is used, employing snap-on CT pickup coils
and two parallel wiring connections. This minimal interface
to the power circuit breaker makes the
OPTI
mizer
2
ideal
for both retrofit and new applications. One, two or three
SF
6
gas density sensors may be used.
The
OPTI
mizer
2
is specifically designed for use on gas
(SF
6
) circuit breakers, but can be used on oil and vacuum
breakers.
The wear models used in the
OPTI
mizer
2
are valid for any
voltage class and correspond to ANSI / IEEE C37.06-1989.
1.2 Operation Overview
CONDITION and WEAR LOGGING
• SF
6
Density (g / L), Pressure (PSIG, BAR, Kilopascals)
Mass (Pounds, Kilograms)
• SF
6
Trend Rate (units / day) Mass Loss (Pounds,
Kilograms, Pounds CO2, Metric Tonnes CO2)
• Trip Time (mS)
• Duration of the arcs (by phase) during tripping (mS)
• Clearing Time (mS)
• Cumulative I
2
x T or I x T on the contacts (phase
segregated) from the arcs during tripping
• Restrike Occurrence (by phase)
• Mechanism opening travel time (mS)
• Mechanism closing travel time (mS)
• Operation Counts (Time and Date Stamping is provided
for each trip operation.)
Alarm set-points may be entered against these items.
SENSING INPUTS
AC Current Input Channels
Three signals (one per phase) from split-core CT pickup
coils placed around the secondary of each circuit breaker
primary phase CT. The signal is proportional to 0-(Max) A
in the primary CT’s secondary circuit (where “Max”= 20,
30, 50, 100,160, 250, 400 or 800 Amps depending upon
the CT range chosen).
System frequency may be at 50 or 60 Hz. These signals
are used to record the arc duration and cumulative
I
2
x T
or
I x T
contact duty.
I
2
x T
or
I x T
calculations are accurate in
the presence of DC offset and sinusoidal harmonics up to
the 16th.
Split-Core CTs
The
OPTI
mizer
2
is designed to be used with
INCON
Split-Core pickup coils only
. Models CT-20, CT-30,
CT-50, CT-100, CT-160, CT-250, CT-400 and CT-800
are custom designed for the accuracy required by the
OPTI
mizer
2
. Range is 1.4-20A, 2.1-30A, 3.5-50A, 7.0-
100A, 11.2-160A, 17.5-250A, 28.0-400A and 56.0-800A
respectively. Three CT’s (one per phase) are provided in a
CT kit. These split-core CT pickup coils snap-on for easy,
non-intrusive installation to the circuit breaker secondary
current circuits. Burden is 0.05VA @ 5 amp.
SF
6
Input Channels
Two types of SF
6
gas density sensors may be used:
2-wire 4-20mA “analog” or INCON Model DSSP “digital”
type sensor. This input is user-configurable for up to
three sensors. For analog sensors, the density units
(grams / liter) are scalable over all or a portion of the
4-20mA signal range. Sensor power of 20VDC is provided
for each channel. SF
6
gas temperature can also be
measured if the “digital” sensor is used.