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| OVERHAULS |
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Original GE LRT200 |
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HVS LRT200-2 Conversion/Upgrade
with Design Enhancements |
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High Voltage Supply defined the standards for high quality and reliable load tap changer overhauls/upgrades, starting with our industry-leading conversion and overhaul of the GE LRT200 in 1994. This overhaul and the many years of experience gained since then have given HVS the knowledge and expertise to develop thorough and comprehensive LTC refurbishment programs for the following LTC models:
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General Electric LRT200, LRT200-2, LRT68, LRT72, LRT38/48
McGraw 500, 550B, 550C
Seimens TLF, TLG, TLH20, TLH21, TLS
Maloney MA/MB, MA1/MB1, MA2/MB2
Westinghouse UTS, UTS-A, UTT, UTTA, UTTB |
Our STANDARD rebuild scope includes the following steps:
• Preparation of a written scope of repair specific to make/model of LTC being overhauled.
• A thorough receiving inspection documents condition and assists in determining most probable failure mode.
 • Complete
disassembly of the entire mechanism and evaluation of all parts
for wear condition and probable failure damage.
• Inspection and cleanup of all drive gears and LTC assembly frame; most are then reused on the rebuilt LTC.
• Replacement of all locking hardware, springs and pivot bushings.
• Hi-pot and wear evaluation of vacuum interrupters (if present).
• Inspection and cleanup of all control wires and terminations, limit switches and motor drive/spring charge mechanism.
• Electrical testing and verification of operation of drive motors and limit switches.
• During rebuild, all newly installed contact assemblies are adjusted and calibrated to ensure proper operation.
• After rebuild and timing, all spring-loaded contact assembly pressures and contact resistance measurements are recorded and evaluated to ensure contacts are mating properly on all positions.
• Depending on the model, a final verification of operation is performed in a tank under transformer oil for up to 25,000 mechanical operations across the entire tap range.
• Each unit overhauled by HVS is warranted for 12 months from defects in materials and workmanship.
• A final repair report detailing all items replaced/reused and a failure analysis showing "as received" condition and mode of failure is available upon request.
HVS also stocks complete rebuilt LRT200-2 LTCs for quick delivery.
For more detailed information on our load tap changer components and design enhancements as well as our LRT200 specific capabilities, please download the following brochures (in Adobe Acrobat format): |
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