Transcript Basic Precipitator Troubleshooting

Basic Precipitator Control
Troubleshooting
Particulate Collection Within A Precipitator
Precipitator operating and optimizing products
Basic Precipitator Troubleshooting
“Normal Meter Readings”
Electrical Reading are shown on meters for illustrative purposes.
Actual readings may be on analog meters, digital displays, or a
combination of both.
Basic Precipitator Troubleshooting
Indication
Cause
One “meter” has
abnormal reading
while others are
within normal ranges
Metering problem
Basic Precipitator Troubleshooting
Indication
Cause
Under Voltage Trip
Electrical ground
within precipitator
Low or no primary
and secondary
voltage, high or
rated primary and
secondary current
Electrical ground
within TR tank
Electrical ground
within precipitator
Basic Precipitator Troubleshooting
Indication
Cause
Over Current Trip
SCR shorted
Control malfunction
Basic Precipitator Troubleshooting
Indication
Cause
SCR Imbalance Trip
One or more bad
SCRs
Failure of the SCR
firing circuit
Basic Precipitator Troubleshooting
Indication
Cause
No primary or
secondary current,
high or rated
voltages
No load on TR
Basic Precipitator Troubleshooting
Indication
Cause
Breaker trips
Short to ground
before SCRs
Bad breaker
Basic Precipitator Troubleshooting
Indication
Cause
Low voltages and
low currents
Excessive sparking in
precipitator
Electrical noise on return
signal (s)
Overloaded Precipitator
Basic Precipitator Troubleshooting
Indication
Cause
No power after
electrical repairs in
control cabinet
Power phasing has
been switched
Basic Precipitator Troubleshooting
Indication
Primary volts are
normal, while the
secondary and
primary currents are
much lower than
normal
Cause
Heavy particulate
buildup on discharge
electrodes causing
corona quenching
and reduced free
electron formation
Basic Precipitator Troubleshooting
Indication
Cause
No sparking is
occurring and no
electrical limit is
being reached
Defective control
components
Defective or
improperly sized
CLR
Basic Precipitator Troubleshooting
Indication
Cause
Readings oscillate
on a 2 to 3 second
cycle
Broken and
swinging discharge
electrode
Basic Precipitator Troubleshooting
Indication
Cause
Readings oscillate
on a 10 to 15
second cycle
Swinging discharge
electrode lower
steadying frame
Basic Precipitator Troubleshooting
Comparing like areas of the
precipitator can reveal
problems that are not
obvious from a glance of the
electrical readings
Consistent differences
between the chambers
indicates possible gas flow or
loading problems.
Basic Precipitator Troubleshooting
When electrical levels
change on just one TR
control the problem is
usually within that control
or bus section.
When electrical levels
change on all the TR
controls the problem is
usually associated with the
process.