This is the server.
If you mean to be using the Production ("Live") site, please go to
This server is used for reviewing content or features before they go live. The content, data, and functionality on this site may not match the live production website.


Traveling-Wave Test System

The SEL-T4287 is a simple-to-use, compact, and economical secondary pulse injection test set for testing traveling-wave fault locators and line protective relays. Traveling-wave fault locators and protection elements and schemes measure sharp changes in their input currents and voltages with rise times as fast as 1 microsecond. The fault locators and relays respond to relative polarities and relative timing of these sharp signal changes. The SEL-T4287 generates output current signals with the short rise time, adequately slow decay, and nanosecond precision necessary for testing standalone traveling-wave fault locators, traveling-wave protective relays, and traveling-wave fault locators embedded in line protective relays.

Starting At

4,287 USD

Request more information


Find Rep By Location

  • Testing single-ended, double-ended, and multi-ended traveling-wave fault locators based on either currents or voltages.
  • Testing traveling-wave directional protection elements.
  • Testing traveling-wave current differential schemes.

Versatile Applications
The SEL-T4287 generates two 3-phase sets of secondary traveling-wave currents. An optional voltage module accessory (low-inductance resistors) allows you to convert one or both current output sets into traveling-wave voltage signals. Test current- or voltage-based fault locators or protection elements and schemes, including: single- and multi-ended fault locators, traveling-wave directional elements, and traveling-wave differential schemes. Time-synchronize or cross-trigger multiple SEL-T4287 sets to generate more than two three-phase traveling-wave signals with timing patterns as needed by the device under test. 

Simple Test Parameter Configuration
Specify line and fault parameters, and let the SEL-T4287 calculate and apply the traveling-wave test signals. A simple and intuitive SEL-T4287 human-machine interface (HMI) allows you to specify test parameters and offers full control of tests without the need for a PC and software. 

End-to-End Testing
Perform end-to-end testing of traveling-wave protection schemes and multi-ended fault locators with multiple SEL-T4287 test sets synchronized to satellite clocks via a standard IRIG-B input. Preconfigure each test set, schedule a test time, and let the multiple SEL-T4287 devices apply the right test signals at all terminals of the line. Test multi-ended traveling-wave fault locators for lines with more than two terminals. End-to-end testing is a standard feature included in the base price and can be used with any IEEE C37.118-compliant satellite clock with IRIG-B output.