LD60A
1-1
SECTION 1: DESCRIPTION
The Liquid Dielectric Test Set, Model LD60A, is designed to test and measure the dielectric
breakdown of insulating oil used in transformers, capacitors, bushings, etc. in accordance to
ASTM D877 and ASTM D1816. The standard test set also satisfies the requirements of IEC,
VDE, and BS standards.
The test set is a portable type built into a rugged carrying case. The Control Panel is below the
cover with the voltmeter and the high voltage test compartment. The test compartment is
provided with a see-through lid interlocked to the test circuit with a limit switch to ensure full
safety during operation.
As options, the test set can be supplied with two different kinds of test cells, either TC/VDE test
cell with VDE electrodes according to ASTM D1816, or TC/DE test cell with 1-inch flat electrodes
according to ASTM D877. Other cells are available upon request.
SAFETY FEATURES
•
Center tapped high voltage transformer.
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The test cell is isolated from the supply when the protective lid is raised.
•
Fast acting relay in series with the high voltage winding and the test cell ensures immediate
cutout at flashover above specified current levels.
•
Control lamp indicating AC power on.
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Control lamp indicating failure.
•
Fast acting fuses are located both in the input to the test set and in the primary of the high
voltage transformer.
OTHER FEATURES
•
Input switch, fuse, and power indicator lamp.
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Motorized output voltage control from 0 to 60,000 volts with three selectable speeds of 500,
2000 and 3000 volts per second.
•
Single range memory voltmeter connected across transformer primary calibrated to output
voltage level records breakdown voltage for the test sample.
•
The test compartment is provided with a 115-volt outlet for convenient plug-in of motor driven
stirrer when testing to ASTM D1816 standards.
