Waukesha® UZD® Brochure
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Waukesha® UZD® TH E S e rvice-Prove n Load Tap Chang e r! With more than 6,500 units installed, Waukesha’s UZD Load Tap Changers boast an excellent field performance record. Design improvements made in the 1990s reduced the already low failure rate to one of the lowest in our industry, reduced maintenance costs and increased maintenance intervals. When compared to the cost of downtime, out-of-service operation and costly repairs, the UZD LTC system is a cost-effective way to keep your transformer operating as smoothly as the day it was installed! A load tap changer, regardless of manufacturer, is a complex engineered device with numerous moving parts requiring precise engineering, correct material selection and controlled manufacturing to operate reliably for a long period of time. In many cases, the true reliability of a load tap changer becomes evident only when a transformer has been in service for several years and the load tap changer accumulates 100,000 plus mechanical operations. Since the UZD’s initial introduction in 1970, it has accumulated in excess of 110,000 YEARS of operational service and an estimated 550 MILLION switching operations. Ongoing continuous improvement programs, in coordination with our customers, resulted in several design enhancements that help increase overall operational life as well as virtually eliminate a need to perform maintenance inside the oil compartment. k ey advantag es of the Wau k esha ® uZ d ® Load tap Chan g e r Resistive Bridging High-speed operation results in extremely low contact wear and manageable levels of arcing by-products. For optimal results, we recommend applying an oil filtration system. Re-Engineered Reversing Switch and Current Collector (“Bow-tie”) System Since the re-engineered reversing switch and current collector system were introduced in 1997, no known failures due to coking have occurred. LTC and Series Transformer System For applications with greater than 600 ampere current ratings, a series transformer is recommended to allow for an optimal volts/turn design of the main transformer windings, even step regulation and smaller leads while facilitating a reduction in current through the LTC contacts for less contact wear and longer life; a power-class series transformer design is recommended for high reliability. Silver-Plated Copper Contacts with Tungsten Copper Inserts Stationary contacts for long life and low temperature rise. Spring Drive Mechanism Stored energy system delivers split-second operation for minimum arcing time; in addition, each tap change is uniform and unaffected by possible auxiliary voltage fluctuations.

Single Set of Spare Contact Parts Due to the design flexibility of the series transformer, we utilize a single model LTC across a wide range of transformer voltage and power ratings. Easy to Maintain with Few Moving Parts A single collector arm incorporates both the arcing contacts and tap selector contacts which reduces linkages, wear points and potential maintenance. R E COM M E ND E D ACCE S S ORI E S Clean, dry oil increases dielectric strength, thereby reducing arcing time. The accessories below help keep carbon particles, metal particles and moisture out of tap changer oil: OF2 Oil...