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VIII. OPTIONS
A. LINE DROP COMPENSATOR
I. DESCRIPTION
The Line Drop Compensator is optional with the Automatic Voltage Regulating Relay
Type EE-301 T. The option is housed in the same enclosure.
The Voltage at the generating end and at the receiving end are not the same due to the
drop across the line. The LDC is used to compensate for this line drop, and the amount
of compensation required is calculated as a % of the Nominal voltage knowing the length
of the line, its resistance/unit length, its reactance/unit length and the rated current, and
set on the front panel.
The line current is stepped down to 1Amp and fed to the LDC unit. The resistive and
reactive drops are simulated by having 90° phase-shifted voltages and their polarity is
selected by polarity switches. The net compensation is then summed with the stepped
down PT voltage.
II. SPECIFICATION :
Resistive & Reactive : 0-20% of the regulating value continuously adjustable.
Compensation
Input rated current : 1 Amp, 50 Hz.
Power consumption : 5VA max. at 1 Amp.
Accuracy : 10%.
Max. Over current : 50% of rated current (1.5Amp).
PolaritySelection : Both positive and negative Compensation.
III. OPERATING AND CONNECTION INSTRUCTION:
CT I/P Connections to the AVR are made through the rear panel terminals (5,6). The line
current is stepped down to 1Amp. 50 Hz and fed to the AVR.
The required amount of %R and %X compensation can be set on the front panel of the
AVR.
The polarity select switches will provide both positive and negative
compensation.
The %R & %X settings can be calculated from following formulae.
%X = 3ILxXL x 100
VL
%R = 3ILxRL x100
VL
Where IL = the primary rated current of the line.
VL = the voltage between lines of power transformer.
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