Ferroresonant L-828/L-829 CCR Description
2009 ADB Airfield Solutions, Incorporated
96A0288T 2-7
All rights reserved Issued 9/04
This subsection describes the L-828 CCR theory of operation.
See Figure 2-5. A resonant network consisting of T1, C1, and the SCRs
draws from the input lines. This network is capable of drawing a limited
amount of power. It can be routed to one of two places. The first is the
output leads to the airfield. The second is a resonant tank comprised of C1
and part of T1.
As more power is allowed to flow into the resonant tank, less is available
to flow to the field. It is by regulating the current in this tank that the
SCRs regulate throughput current to the airfield. It is important to note
that the output of the regulator will be the smallest when the “SCRs” are
conducting 100% of the time. This is the opposite of what is seen in
simple SCR regulators where the SCRs are used to directly control the
output of the regulator.
NOTE: C1 is actually a bank of capacitors located near T1.
The components of the resonant network are designed to deliver an output
current slightly higher than 6.6 A/20 A for the minimum input voltage,
while the SCRs are fully off.
The output current flows through the high voltage current transformer T5.
T5 provides feedback to the URC board on the actual current output to the
airfield series circuit.
A second current transformer, T2, provides current to a true rms-reading
ammeter mounted onto the front panel to indicate output current.
See Figure 2-4. This subsection describes the board level circuitry found
on the universal regulator controller.
Figure 2-5 L-828 CCR Power Circuit Block Diagram
Universal Regulator
Controller
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