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Automatic Power
Factor Controller Type 1107
Power
Factor is an important parameter needing control. The Syntron
Automatic Power Factor Control Relay type 1107 is specifically
designed to control the power factor of an installation accurately
and reliably. Introduced first in 1982, the Relay has undergone
countless refinements and improvement to make it the most sought
after APFCR in India.
The
leaflet reflects all the changes, refinements and additions made in
the line. The major additions are:
- The Relay with over
8 stages were earlier supplied with extension sequencer which had to
be mounted separately. We now supply relays with up to 24 stages in
one enclosure.
- The original 1107 had an analog power factor
meter, some users demand a digital power factor meter thinking that
it would be more accurate. Actually the PF meters normally provided
are 2 ½ digit type, the resolution of which is worse. Accuracy may
be the same.
We therefore designed in a four digit power factor meter the
accuracy of which is the same as analog and resolution is ten times
better than the two and a half digit versions. The meter provided on
the 1107 is also far more stable to provide meaningful readings
Function
The
APFCR controls the power factor of the installation by giving signals
to switch on or off power factor correction capacitors. It should be
noted that this is only a Relay constituting the so to say 'brain' of
the system and it cannot switch the capacitors directly but need
intermediate contractors of appropriate ratings.
The
APFCR has a built in power factor transducer which measures the power
factor of the installation and converts it to a DC voltage of
appropriate polarity. This is compared with a reference voltage which
can be set by means of a knob calibrated in term of power factor.
When the power factor falls below setting, the APFCR switches on the
capacitors one by one in sequence, which can be either First In First
Out (FIFO) or First in Last Out (FILO). In either case the capacitors
of all stages must all be of same rating. The Relay switches them on
in linear sequence
Facilities
Power Factor Meter :
Four Digit Digital Meter. Please refer description above.
PF Setting Dial :
The required PF is to be set on this dial calibrated from 0.75 lag
to .99 lead
Dead Band Knob :
This setting determines the range of phase angle over which the
Relay will not respond. Dead Band is necessary to prevent
overcorrection and hunting.
Undercurrent Blocking :
When the load is low the effect of the capacitors is more pronounced
and may lead to hunting. Undercurrent Blocking shuts down the Relay
when the load is too low, and switches off all the capacitors one by
one in sequence.
Auto/Manual Facility :
The system may be operated manually from the Relay by this control.
Special Timing Sequence : The
APFCR has a built in logic timer which inhibits operation for a
fixed delay of 65 seconds for LT Relays (and 310 seconds for HT
application Relays) whenever the following changeover occur:
Changeover from Auto to Manual and vice versa.
Changeover
from capacitor off to capacitor on signal.
This delay ensures
that the capacitors are fully discharged before they are re switched
in. This avoids transient and damage to capacitors.
Indication : The APFCR has solid state
indication lamps (LEDs) for every one of the function the operator
should know about : Auto, Manual, Low PF, High PF, Timer, Amps OK,
Test (to indicate that the Relay is in TEST Mode.) and for each
capacitor switching stage
Specifications
Voltage
400
- 415 - 433 - 440 volt (specify one) three phase three wire 50Hz 20
VA (110 volt models on request)
Current
Through
CT. Full scale 1 Amp or 5 Amps.
Meter
Digital
meter : range 0.000 lag to 0.000 lead, lag and lead indication by
separate LEDs.
PF
Setting range
0.75
lag to 0.99 lead.
Dead
Band Control
At
minimum : 4 deg electrical; At maximum : 14 deg electrical
Capacitor
Switching
Standard
models are for upto 16 stages and for upto 24 stages.
Each
switching stage is provided with one normally open potential free
contact.
Switching
sequence can be FIFO or FILO as noted above, as per order.
Contact
Rating
Each
switching contact is rated for maxima of 440 volts and 5 Amps AC
resistive loads.
Dimensions
Front
Bezel : 365 mm W X 135 mm H
Panel
Cutout : 355 mm W X 125 mm H
Depth
Behind Panel : 285 mm including terminals
Weight
6.0
Kg approx for 8 stage model, 7.5Kg approx for 16 stage model. > 24
stage model
- Field
proven since 1982.
-
Tens of thousand in use.
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Up to 32 stages with extension
sequencer.
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Built in Auto/Manual Control.
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Available for LT & HT
application.
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4 Digit Power Factor Meter.
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Intelligent timer prevents
reswitching of changed capacitors.
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Dead band control to prevent
hunting.
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Up to 24 stages in standard
version.
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One of the First &
Oldest APFC Relay manufactured in India.
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High noise immunity.
-
LED indication for all operation.
- Built in test facility.
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PF setting from 0.75 lag To 0.99
lead.
-
Accurate and reliable.
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