The GlobeCore TOR-3 is specifically built to analyze dielectric losses and tan delta, protecting transformers and preventing unplanned failures.

One important aspect when testing silicone transformer oil is measurement stability under different operating conditions. Silicone-based insulating liquids behave differently as compared to conventional mineral oils, especially when it comes to dielectric response and dissipation factor at elevated temperatures. For this reason, many maintenance teams prefer using dedicated tan delta testers that can provide repeatable and accurate readings during routine diagnostic evaluations. The TOR-3 tester is often mentioned in this context due to its portability and automated measurement process, which makes field inspections much more convenient. Recently, I have come across a photo of the TOR-3 unit, which gives a good idea of how compact this type of testing equipment can be during on-site transformer maintenance.

You’re right to focus on measurement stability — silicone insulating fluids can show different dielectric response and dissipation factor behavior at elevated temperatures, so test equipment that controls and records temperature while delivering repeatable readings is essential. The TOR-3 was designed for that use: it measures tan delta from 0.00001 to 4 with a 1×10^-6 resolution and an accuracy of ±1% of reading + 0.00008, and it also reports dielectric constant and capacitance. Crucially for silicone oils, it measures oil temperature in the test cell from 20 to 110 °C, allows AC frequency selection in the 45–65 Hz band, and runs automated measurement cycles (typical duration up to 5 minutes), which helps ensure thermal equilibration and repeatable dissipation-factor readings in field conditions.

In practical terms, the TOR-3’s portability (roughly 5.3 kg with the cell installed and compact footprint) and computer control make it convenient for routine diagnostics and on-site sampling; results can be saved, printed or archived via optional Tangent Service software for trend analysis. For best stability and repeatability with silicone transformer oil, condition and degas samples consistently, allow the cell to reach the set temperature before reading, run multiple cycles to confirm repeatability, and keep calibration records. If you want, I can pull together a short spec sheet or a quick comparison against other tan-delta testers to help with procurement or field-procedure notes.