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.
USB port for firmware upgrades
View line and test parameters
View the selected test trigger source
Arm and initiate a test manually
Navigate to line and test parameters
Confirm new values of line and test parameters
Change the menu selection, and dial in new values of line and test parameters
Traveling-wave current outputs
Initiate a test using a 48 V binary input trigger
Transistor-transistor logic (TTL) cross-trigger outputs to other test sets
TTL cross-trigger input from other test sets
IRIG-B input from a satellite clock for synchronized testing
Power supply: 110–240 Vac
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.
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.