Transmission and distribution: Reactive-type on-load tap changers

Transmission and distribution energy management electrical distribution Reinhausen

Humboldt, TN – Electrical distribution: Reinhausen Manufacturing Inc. has been manufacturing reactive-type on-load tap changers with vacuum interrupters in its Humboldt, TN facility for over 25 years. As the leader in OLTC vacuum technology, Reinhausen is world renowned for its reliable, long-lasting products. During the month of September, two benchmark units were shipped from the Tennessee facility: the 10,000th VACUTAP® RMV-II OLTC and the 12,000th VACUTAP® model. Also, earlier in August, the 13,000th OLTC (across all models) assembled in the Humboldt factory was shipped.

Each of these On-Load Tap Changers will go on to serve their respective owner utilities for many years:
• The 10,000th VACUTAP® RMV-II OLTC shipped from Humboldt was a 2,000A unit rated for 72.5kV with motor drive MD-I. It will be applied by SPX Transformer Solutions in Wisconsin on a 170MVA transformer being built for PPL Electric Utilities.
• The 12,000th VACUTAP® OLTC shipped was a VACUTAP® RMV-A rated at 1,320A and 15kV with motor drive MD-I. It shipped to Prolec-GE in Mexico for installation on a 12.5MVA transformer being built for Hydro One in Canada.
• And finally, the 13,000th OLTC shipped was a VACUTAP® RMV-II-2000A, 72.5kV class with a MD-I motor drive. It will be in service at Centerpoint on a 50MVA transformer built in St. Louis, MO by ABB.

The VACUTAP® product line, which includes among others the RMV-II and RMV-A OLTC models ranging from 600A through 2,500A and BIL levels from 110kV through 400kV, offers the lowest maintenance OLTC units available today, with maintenance intervals only driven by the number of operations making time-based maintenance obsolete. The RMV-A and RMV-II OLTCs are standard three-phase designs, each consisting of a tap selector, a change-over selector and a vacuum interrupter with by-pass switch. The tap changer works on the preventive autotransformer (reactor) switching principle with vacuum interrupters used to interrupt the circuit within a half cycle. The interruption of the load current takes place inside a vacuum tube rather than the usual arcing under oil; therefore, oil contamination is eliminated – lengthening the life expectancy of the units to span several careers! In fact, the RMV-A and RMV-II are maintenance-free up to 250,000 and 500,000 switching operations respectively. Plus no oil contamination means no oil disposal, which means a greener approach to transformer control.

For more information about Reinhausen or other products, click here to go to Utility Products’ Buyers Guide.

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