SEL-T35

Preorder

Preorder

SEL-T35

Time-Domain Power Monitor

The SEL-T35 streams ac and dc voltage and current measurements to SEL Synchrowave software for real-time, wide-area system analysis. The data stream includes 1 Msps and 14.4 ksps waveform data and 1 ksps energy packets.Synchrowave software receives, stores, analyzes, and reports these data for system monitoring and post-event analysis. A virtual metering application calculates traditional analog quantities, while disturbance detection logic captures transient events, subsynchronous oscillations, and system faults. The system calculates energy packets every millisecond, providing visibility into energy transfer independent of phase angle, frequency, and signal distortion.The oscilloscope software records 1 Msps waveform data and exports COMTRADE and CSV formats for further analysis. The SEL-T35 streams 17 analog quantities and 2 binary input statuses. An integrated ride-through pack helps maintain data capture during short-duration outages.See the SEL-T35 and Synchrowave software in action with live data.

Starting At

$5,400 for SEL-T35#0001, including one SEL-5703 Synchrowave Monitoring license

Continuous Waveform Recording

The compact SEL-T35 streams data from up to four ac current inputs, four ac voltage inputs, and four dc inputs directly to SEL Synchrowave software for visualization and historian recording.

Triggerless Data Capture

Record waveforms and time-domain energy packets at up to 14.4 ksps without preconfigured triggers. Continuously stream data to capture faults, disturbances, and normal operations and archive up to several years of gapless data.

Flexible Data Acquisition

Low-level milliampere dc analog inputs to measure the output from third-party transducers, including temperature, solar irradiance, and high-energy dc voltage or current.

Seamless Event Ride-Through

The integrated ride-through pack protects the data stream from short-duration outages providing at least seven seconds of continued operation after the power supply input drops out.

Real-Time Data Integration (Coming Soon)

The SEL Real-Time Automation Controller (RTAC) calculates a wide range of quantities from the SEL‑T35 14.4 ksps data stream for system-level monitoring, automation, and control. It performs functions including data aggregation; high-speed control using half-cycle magnitude and 1-millisecond energy packet measurements; and digital fault and disturbance recording. 
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Capture Every Disturbance With Continuous Waveform Recording

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Advance Power System Awareness With Continuous Waveform Streaming

Minimize the cost of harmonic mitigation with continuous waveform recording

David Renfro from Infiniti Integration Services describes SEL continuous waveform recording as the arbiter of truth and as a method for capturing all disturbances without custom event trigger logic. Learn how he optimizes filter designs for harmonics caused by variable-speed motor drives.

Continuous Waveform Streaming and Energy Packets: Capture Every Disturbance

Continuous waveform streaming and recording from SEL delivers gapless, full-bandwidth visibility into voltage, current, power, and energy transfer across your system. Unlike traditional digital fault recorders, continuous waveform data captures every event without relying on predefined trigger conditions.As inverter-based resources and large load dynamics—like data centers—connect to the grid, system behavior grows increasingly complex. Sudden step changes can introduce voltage disruptions, frequency deviations, and power oscillations that trigger-based monitoring may miss.The SEL continuous waveform recording system, powered by Synchrowave software, streams fixed-rate, time-synchronized data from the SEL-T35 Time-Domain Power monitor, sampling at 14.4 kilosamples per second (ksps). This high-resolution data meets Nyquist criteria for frequency-domain reproduction, eliminating the need for phasor approximations or frequency tracking. The result is high-fidelity measurements with wide bandwidth and precise time alignment.
 

Virtual Metering

Virtual metering enables power quality monitoring using existing devices — no extra hardware is needed. Leverage the Virtual Meters application with an installed SEL-T35 Time-Domain Power Monitor to calculate metering quantities from continuous waveform streaming data. It calculates fundamental and rms voltage, current, and power values as well as frequency and power factor. 

Characterize Data Center Loads

Measure, identify, and visualize rapid power fluctuations and voltage oscillations commonly observed at data centers involved in AI training and inference. 

SEL-T35 Features

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  1. Type-C USB port
  2. Color touchscreen display
  3. Backlit pushbuttons
  4. Power supply ride-through pack
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  1. Current inputs
  2. Power supply inputs
  3. Communications ports
  4. Contact outputs
  5. Analog inputs
  6. Voltage inputs
  7. Contact inputs and auxiliary voltage input
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  1. 5-inch color touchscreen
  2. Display voltage and current waveforms in real time.
Portable Time-Domain Power Monitor.png
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  1. Monitor power quality anywhere with the rugged SEL-T35. Synchrowave Monitoring software, running on a user-supplied laptop. Please contact SEL if interested in this option.
  2. Clamp on CTs and clip-on voltage leads detect current and voltage disturbances. 

SEL-T35 Details

Continuous Waveform Streaming

Stream continuous oscillography at 14.4 ksps using a modified IEEE C37.118 format transmitted over high-bandwidth networks to SEL-5702 Synchrowave Operations Software or SEL-5703 Synchrowave Monitoring Software. 

Energy Packet Streaming

The SEL-T35 data stream includes time-domain energy packets calculated every millisecond. This industry-exclusive energy packet technology captures energy measurements independent of frequency and phase angles, eliminating frequency-tracked delay or calculation issues with nonlinear signals. Positive energy packets represent energy delivered to the load. Negative energy packets represent the energy received from the load. Negative energy packets can indicate reduced system utilization.

DC Transducer Support

Four low-level milliampere (mA) dc analog inputs measure the output from third-party transducers, including temperature, solar irradiance, and high-energy dc voltage or current.

Synchrowave Analytics

Capture system faults and disturbances using external software without relying on preconfigured trigger conditions. Applications include archiving, user calculations, subsynchronous oscillation analysis, and equipment failure analysis.

Event Ride-Through

An integrated power supply ride-through pack continues to power the SEL-T35 for at least seven seconds if the power supply input drops out. This feature ensures that the SEL-T35 never misses an event during short-duration outages.

Minimize the cost of harmonic mitigation with continuous waveform recording