Trans-Rupter II® Transformer Protector
Models
Model EX — With Tripping by User-Furnished Relays
Model EX is compatible with virtually any user-furnished differential, sudden-pressure, or overcurrent relay. Pole-units are field-wired to a low-voltage connection enclosure for connection to user-furnished relays and control power. Model EX requires a user-furnished 48-Vdc or 125-Vdc control-power source.
Model EX Motor Operator Option
The Trans-Rupter II Transformer Protector Model EX offers and innovative and economical solution for substation transformer protection. Now there’s an easy and cost-effective way to add remote-resetting capability to the Trans-Rupter II Model EX. Introducing the motor operator option.
Trans-Rupter II motor operators are:
- Easy to Install. Single-phase motor operators couple directly to the pole-unit operating shafts. The pole-unit indicators are fully visible with the motor operators installed.
- Easy to Operate. The motor operators close and charge the Trans-Rupter II pole-units in response to a user-furnished signal-or when a push button is pressed locally at the low-voltage connection enclosure. Trip and close pushbuttons are included with the motor operator option.
- Durable. Fully tested motor operators use a minimum of parts and are designed for long operating life.
- Weather-resistant. Motor operators are designed to withstand the elements. No heaters needed.
- Retrofittable. Motor operators can be added to most Trans-Rupter II installations at any time.
A user-furnished, source-side, three-pole, group-operated disconnect is required to isolate the Trans-Rupter II during closing and charging, and to pick up transformer magnetizing inrush current.
Model SE Overcurrent Protection System
The overcurrent relays provide both time-overcurrent and instantaneous-overcurrent protection. They’re field-settable with adjustable time delays. The time-overcurrent function includes 10 time-current-characteristic curves, including inverse, very inverse, and extremely inverse curves, in accordance with IEEE and IEC standards. Relay operating time is two cycles. Combined with Trans-Rupter II’s 3-cycle interrupting time, Model SE provides a total fault-clearing time of 5 cycles.
Sensing for the overcurrent relays, as well as power for the trip-energy supply, is provided by the transformer primary-side current transformers. A manual trip device, which provides the energy to trip all three pole-units if the line is de-energized, is also included.