Ultra-High-Speed, Secure Tripping—The SEL-T400L features two traveling wave elements, TW87 and TW32, that operate in as fast as 1 ms. The relay also offers two incremental quantity elements, TD21 and TD32, that operate in as fast as 4 ms.
Simplicity in Design, Installation, and Configuration—With less than 25 protection settings, the SEL-T400L is easier to learn, easier to set, and less dependent on short-circuit studies.
Breakthrough Data Sampling—The SEL-T400L provides high-resolution event records sampled at 1 MHz, 18-bit resolution. Using these events, you can analyze transient events, such as traveling waves from faults, breaker restrike, or partial discharge.
Cutting-Edge Fault Location—Using single-ended traveling wave fault location, the SEL-T400L can locate faults within one tower span, without the need for a communications channel.
Ultra-High-Speed, Secure Tripping
Protect critical lines using the SEL-T400L with time-domain principles. The relay operates at ultra-high speeds without compromising security. The incremental quantity TD21 distance element can be set as far as 80 percent of the line length and operates in the order of 4 ms without communications. The incremental quantity TD32 directional element operates in as fast as 2 ms, and the TW32 traveling wave directional element operates in as fast as 1 ms. The TW87 traveling wave differential element operates in 1 to 4 ms, depending on the line length and fault location.
Simplicity in Design, Installation, and Configuration
Use the SEL-T400L with existing control cables and wiring to connect to conventional current and voltage transformers, including coupling capacitor voltage transformers (CCVTs). Setting the SEL-T400L is simple and does not require complex short-circuit studies. It uses nameplate data that do not need to be reevaluated as the system evolves. These include current and voltage transformer ratios, line impedances and length, TD21 reach, and port configuration settings.
Breakthrough Data Sampling
Record events as long as 1.2 seconds with sampling up to 1 MHz to capture fault event records or transient events, such as traveling waves from faults, breaker restrike, or partial discharge. When the 1 Gbps TW87 channel is present, the relay records high-resolution remote currents and voltages, as well. In addition, the SEL-T400L allows data streaming of 1 MHz currents and voltages via a 1 Gbps port. The streaming capability is coming soon.
Cutting-Edge Fault Location
Find faults to the nearest tower with the SEL-T400L. The relay includes both single- and double-ended traveling wave fault locators. The single-ended fault locator does not require communication. The algorithm analyzes multiple wave reflections to accurately locate the fault by using the impedance-based approximation of the fault location (patent pending).