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High Reliability, "Utility-Grade" Performance
Reliability on Demand. That's what you said you needed in a "Utility-Grade" Vertical Break switch. Turner listened, and the TMX line of switches was born.Meeting the switching needs of Utility System Engineers is a demanding task. It is something at which Turner Electric has excelled for more than 50 years.
Turner's TMX aluminum-alloy switch is a rear rotating-stack, group operated, vertical break, heavy duty air-break switch.
The TMX vertical break switch is configured to provide our utility customers:
- vastly shortened times between order and delivery;
- significant reductions in installation-labor requirements;
- maximum periods between scheduled maintenance
- unparalleled ease of upgrade.
Turner Electric's new TMX switch's extreme-duty construction and ease of operation and installation makes it perfect for demanding substation and line operations such as line dropping, isolating breakers and demagnetizing transformers. When coupled with the equally new, and revolutionary, Teco-Rupter Vmax (with expanded interrupting capabilities), the new TMX switch easily interrupts up to 3000 Ampere without the use of potentially hazardous gasses.
Re-designed for Industry Needs
Performance criteria established was to meet or exceed ANSI and NEMA standards, and independent test results prove we are more than qualified.Internal construction is both simple and functional. In fact, there are only three moving current transfer points on the TMX switch; with the jaw being the only exposed separate contact. All current-carrying components are either silver plated copper alloy or high conductivity aluminum alloy.
Blade actuation on the TMX switch is based on the field-proven, DELTA STAR MK-40A EHV design that incorporates the blade counterbalancing spring within a tubular housing.*
(*69kV and above designs)The counterbalance provides positive, all-position control of the blade throughout the complete opening-closing cycle. No auxiliary latches, cams or other mechanisms are employed. The switch operates smoothly and easily.
Factory-set blade stops assure proper positioning of blades in the opened and closed positions. The perfectly counterbalanced blade can be stopped in any intermediate position, from fully closed to fully opened, without danger of the blade falling into a closed position.
Factory sealing of the entire driving mechanism assures permanent adjustments and eliminates maintenance in that area.
Whether installed in substations, or platforms, these switches can be mounted upright, vertical or underhung.
Switch rating upgrades are accomplished in minutes by even in-experienced line crews. Ratings can be increased from 2000 Ampere to 3000 Ampere by changing the blade and adding contacts. Switch bases (on 115kV and above) are one-piece, extruded galvanized, square-tube steel.
Switches are pre-assembled at the factory for 46kV ratings and below.
Reverse-Loop Contacts Design
In use since the 1950's, reverse-loop designed contacts employ the natural repulsion of magnetic fields moving in the opposite direction to increase the holding-force against the blade edges. Increasing the current flow, such as in fault conditions, increases the magnetic repulsion, which creates a high-pressure force on the blade tip, holding the blade in the jaw.Control Mechanisms
TMX Switches are operated with universal control mechanisms that adapt to any type of structure. Manual controls are furnished as standard equipment with each switch unit.TMX switches can be remotely and automatically controlled using either the SF100 or SF200 Motor Operator mechanism.
Terminal Pads
Connections are pre-drilled, 4-hole NEMA mounting points, integral to the extruded aluminum frame. This design easily accommodates dual conductor or heavy bus loading on each end. We exceed ANSI standards, supplying three mounting surfaces.
Blade Mechanism
The powerful blade mechanism is truly the height of simplicity - only three moving parts are employed. Easy field installation and adjustment is built into the design. Vertical stops can be adjusted to stop slightly past 90 degrees for flawless installation.Blade and Jaw Contacts
TMX Switch contacts feature large deflection, high-conductivity tin plated copper fingers with silver-plated mating surfaces, reinforced with non-current carrying stainless steel back-up springs. Tips are tin-plated Copper with silver-plated contact points that are easily replaced.
Bases
Standard base construction, 115kV and above, is one-piece, extruded, galvanized, square-tube steel. Below 115kV, a single channel is provided. Bases are hot-dipped, galvanized steel; easily adaptable for mounting on steel or wood structures.Hinge Mechanism
Turner's method of enclosing the hinge mechanism protects the threaded, silver-to-silver contact surfaces from environmental concerns, which minimizes maintenance requirements.Bearings
The main pivot bearing consists of two tapered TimkenŠ roller bearings, which are adjusted and lubricated at the factory and require no further attention for the life of the switch. Bearings are protected with a Neoprene seal, and permanently sealed at the bottom with a Welsh-type plug.Leveling
Jacking bolts are provided on the non-rotating insulators to meet any special leveling needs.
©2001-08 Turner Electric : Last updated: Nov 05
