“See the Heat Before It Hurts” — How the TSW Series Makes Transformer Temperature Visible, Smart, and Safer

TonyZhang
Nov 23, 2025
3 min read

In most substations, temperature data for transformers still hides behind the control room screens. Oil, core, and winding temperatures — the “three thermometers” that reveal a transformer’s true condition — are often invisible at the equipment itself. Operators walk back and forth between panels and SCADA terminals just to confirm if things are running hot or cold.

In regions like Inner Mongolia, Gansu, and Xinjiang, where on-site staffing is essential, maintenance teams need something better: a direct, on-the-spot view of critical temperatures.

That’s where the ODES TSW Series Temperature Transmitters come in — combining precision sensing, digital display, and over-limit alarm outputs in one compact device. The result: temperature that’s not only measurable but visible, reportable, and controllable.

Explore ODES substation modernization solutions at www.odes-electric.com

1. Three Real-World Use Cases That Change Daily Operations

1. Local “Three-Temperature” Display — Faster, Safer Inspections

Before: operators had to return to the control room to check readings. Now: the TSW Series’ bright LED display shows oil, core, and winding temperatures directly at the cabinet or transformer bay — real-time and at a glance. All three readings and alarm states appear together, eliminating guesswork and improving patrol efficiency.

2. Three-in-One Measurement — Smarter Monitoring, Simpler Wiring

In traditional systems, each temperature point required a separate transmitter, leading to extra wiring, multiple connectors, and higher cost. The TSW35 changes that:

One device captures three independent temperature channels.
The front panel simultaneously displays all three values and alarms.
Each channel provides 4–20 mA outputs for SCADA or protection input.

This design reduces wiring by about 40%, integrates data collection and alarm signaling, and simplifies retrofits.

3. Easy Retrofit — Plug-and-Play for Older Substations

Upgrading legacy substations is no longer a headache. The TSW Series supports full compatibility with existing Pt100 sensors, allowing replacement without rewiring or new probes. Once installed, technicians can verify readings immediately, saving hours of downtime during retrofit projects.

2. Engineering Highlights That Make It Reliable

Independent 3-Channel Configuration

Each input channel accepts a Pt100 RTD with separate upper/lower limit and alarm settings. This consolidated design reduces space requirements and improves monitoring accuracy.

Precision and Durability in Any Environment

Measurement range: −200 °C to +850 °C
Output signal: 4–20 mA / 0–5 V
Accuracy class: 0.2% / 0.5%
Isolation strength: ≥ 2 kVAC between input, output, and power
EMC rating: Level IV (IEC 61000-4), tested for ESD, surge, and fast transients

Even in high-altitude, sand-prone, or freezing climates, the readings stay stable and alarms accurate.

High-Brightness LED Display

Operators can view real-time temperature, over-limit status, and channel index directly from the front panel — no external display or laptop required.

Alarm Contacts for Automated Response

Each channel features an independent alarm relay (5 A @ 250 VAC). When limits are exceeded, the relay can activate fans, audible alarms, or system interlocks, enabling automatic protection and coordination.

3. Proven Results from the Field

Inner Mongolia Wind Farm Substation: TSW35 units now allow on-site personnel to read oil and winding temperatures directly, enabling smarter fan start-stop decisions.
Central China 110 kV Retrofit: Implementing the three-channel design cut wiring by 40% and reduced patrol time by half.

Conclusion

Temperature data should never be hidden in a backend interface — it’s the first line of defense for every transformer.

The ODES TSW Series brings that data to the surface with on-site display, alarm signaling, and integration-ready outputs. When temperature is visible, safety becomes controllable.

Upgrading your station’s “three-temperature” monitoring?

Ask our engineers how the TSW35 can simplify installation and improve visibility.
Request configuration and alarm mapping guides for your next retrofit project.
Modernize your inspection process with smart, on-site temperature monitoring.

Contact: 📩 tonyzhang@odes-electric.com

Or visit: www.odes-electric.com

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