2.3.10.4
Rapper High Voltage Spikes
Provide the rapper system with surge suppressors and other devices as
required to eliminate high voltage spikes.
2.3.10.5
Rapper Annunciation
Provide remote annunciation for malfunctions of the rapping system as
follows:
a.
"White" light for rappers not operating (power failure).
2.3.11
Annunciation and Indication
2.3.11.1
Off-Limit Conditions
Provide annunciator and indication equipment for individual annunciation
and indication of the following off-limit conditions:
a.
T-R control trouble.
b.
T-R overload, one each transformer-rectifier.
c.
T-R undervoltage, one each transformer-rectifier.
d.
T-R open circuit, one each transformer-rectifier.
e.
T-R not in remote, one each transformer-rectifier.
f.
Penthouse or insulator compartment air pressure low.
g.
Loss of penthouse pressurizing airflow.
h.
Rapper control failure, one each rapper control enclosure.
i.
Low hopper temperature.
j.
Insulator temperature below [107 degrees C] [225 degrees F][_____].
k.
Purge air filter clogged.
2.3.11.2
Annunciator
Provide annunciator with a station for each alarm input plus a minimum of
25 percent spare stations. Provide sufficient stations for annunciation
such that the items of equipment that failed can be easily identified.
Provide a backlighted window for each station with an engraved legend that
will be readable by a [standing] [sitting] operator at the operating
station. The unit shall be complete with test, audible silence, flasher
reset, and lamp reset pushbuttons and audible device. Incorporate an
adjustable time delay relay in the annunciator audible device circuit to
cause automatic silencing of the device after a manually selected time
period. The annunciator stations shall, however, remain lighted until the
trouble is cleared. Provide solid-state type annunciator, suitable for 120
volts AC power supply with not less than 125 volts DC applied to the
trouble contacts. Include one electrically isolated contact per window for
remote annunciation. Provide positive oriented logic, 120 volts AC or 125
volts DC power supply for trouble contacts, and two lamps wired in parallel
circuit per indicating window. Design annunciator alarm contacts to accept
SECTION 15862N
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