218
March 1996
Power Circuit Breakers Type DSII and
SPB with OPTIM Trip Units
Typical Specifications
cuit shall be included to prevent the breaker
being closed and latched onto a faulted
circuit.
The trip unit shall have an information system
that utilizes battery backed-up LED's to indi-
cate mode of trip following an automatic trip
operation. The indication of the mode of trip
shall be retained after an automatic trip. A trip
reset button shall be provided to turn off the
LED indication after an automatic trip. A test
pushbutton shall energize an LED to indicate
battery status.
Circuit breakers shall be provided with a
power/relay module to supply control power.
Internal relays shall provide contacts for
remote indication of the mode of trip (long
delay, short circuit, ground fault) and high load.
A red LED shall be provided on the face of the
trip unit and pre-set to flash on and off when
an adjustable high load level is exceeded.
A time delay shall be provided to avoid
nuisance alarms.
The microprocessor-based trip units shall be
capable of monitoring the following data:
●
Instantaneous value of phase, neutral and
ground current
●
Minimum and maximum current values
●
Average demand current
●
System diagnostic information such as
alarms and cause of trip
●
Approximate level of fault current that
initiated an automatic trip operation
The monitored data shall be displayed by a
hand-held programmer, a breaker interface
module or a remote computer.
The trip unit shall be capable of two-way com-
munication via a network twisted pair for re-
mote monitoring and control. The trip unit
shall be provided with a programmable ad-
dress. Transmittable parameters shall include
protection settings, individual phase, neutral
and ground current, minimum and maximum
currents, average demand current breaker
status (open/closed/tripped), trip events and
mode of trip; information on external trip net-
work commands, data or program memory
test failure, missing or defective rating plug,
test push-button operation, or communica-
tion failure. The breaker shall be capable of
responding to open and close commands via
the communication network. Where indicat-
ed, provide electrical operators which re-
spond to a close command via the
communication network.
The trip unit shall contain test capability. Test-
ing shall be carried out by using a hand-held
programmer, a breaker interface module or a
remote computer to select the values of test
current within a range of available settings.
The basic protection functions shall not be
affected during test operations. The breaker
may be tested in either the “Trip” or “No trip”
test mode. Provide an optional auxiliary
power module to allow the breaker trip unit to
be bench tested with a 120 volt external
power source.
A hand held programming unit shall be pro-
vided to set/change the network communica-
tion breaker address for each device, set the
system baud rate, distribution frequency,
display breaker information and display
monitored values. In addition, provide pass-
word protection for programming time-
current set points and to perform functional
testing of phase and ground trip characteris-
tics. The programmer shall be self powered
by an internal battery. Provide one hand-held
programming unit when other means of
programming the circuit breakers are not
provided.
Provide a local area network connecting each
circuit breaker trip unit to a breaker interface
module (BIM). The BIM shall be capable of
changing the network communication
breaker address for each device, setting the
system baud rate and distribution frequency,
displaying breaker information and display-
ing monitored values. In addition, provide
password protection for programming time
current set points, and to perform functional
testing of phase and ground trip characteris-
tics. The BIM shall have help message
capabilities and shall communicate informa-
tion for up to fifty devices including Digitrip
OPTIM, 810, and 910 trip units and energy
sentinels. Provide a 30-volt DC power supply
for the BIM which is to be mounted within the
assembly. Provide a product operated net-
work interface (PONI) for the BIM to commu-
nicate via the IMPACC network to a remote
computer.
Provide Cutler-Hammer/Westinghouse
Digitrip OPTIM 750 Trip Units
Note to Specifier — For trip units with the
additional functions of the Digitrip OPTIM
1050 for SPB or DSII circuit breakers, insert
the following:
The microprocessor-based trip units shall be
capable of monitoring the following data:
●
Peak demand (Megawatts)
●
Present demand (Megawatts)
●
Reverse power flow
●
Energy consumption (Megawatt-hours)
●
Reverse energy consumption
●
Power Factor
●
Percentage harmonic content
●
Total harmonic distortion (THD)
The monitored data shall be displayed by a
hand-held programming unit, a breaker inter-
face module or a remote computer.
Circuit Breakers shall be provided with a
potential transformer module, suitable for
operation up to 600 volts. The primary of the
potential transformer module shall be con-
nected internally to the load side of the circuit
breaker through a dielectric disconnect plug.
The trip unit shall be capable of two-way
communication via a network twisted pair for
remote monitoring and control. Transmitta-
ble parameters shall include the addition of
power and energy values, line-to-line voltage,
power factor, total harmonic distortion,
harmonic content and waveform capture, via
the IMPACC communication network .
Provide Cutler-Hammer/ Westinghouse
Digitrip OPTIM 1050 Trip Units.
