If you are sourcing transformer oil test equipment for a Chinese refinery lab, a State Grid substation, or an export project with dual compliance requirements, "SH/T standard" is a phrase you will see on almost every datasheet. SH/T codes are petrochemical industry standards issued under China's SH series. They do not replace GB/T national standards or DL/T power-industry methods-but for several core insulating-oil tests, they remain the reference that instrument makers build around.
SH/T 0206-1992 - Oxidation Stability Tester
This is the standard most directly tied to a named machine. It specifies a 164-hour oxidation run: 25 g of oil, oxygen bubbling through the sample, a copper catalyst, and measurement of total sludge and acidity afterward. The method traces back to IEC 74 (1974). Benchtop units marketed as SYD-0206 or GD-0206 oxidation stability testers are dimensioned to SH/T 0206-typically six parallel baths, metal-block heating to ±0.2 °C, and flow-controlled oxygen lines. If your QC program tracks how quickly in-service oil forms sludge, this is the standard your tester must follow.
SH/T 0207 / NB/SH/T 0207-2010 - Trace Moisture Analyzer
The 1992 Karl Fischer method (SH/T 0207) for insulating-oil water content was superseded in 2010 by NB/SH/T 0207-2010, which aligns with coulometric Karl Fischer titration-the same principle behind automatic trace moisture analyzers. In practice, many datasheets still cite SH/T 0207 for legacy compatibility. For running-oil supervision under GB/T 7595-2017, moisture limits are often cross-referenced with GB/T 7600 as well, so confirm which code your audit checklist names before purchase.
SH/T 0304-1999 - Corrosive Sulfur Test
This standard covers corrosive sulfur in electrical insulating oils: a polished copper strip contacts the oil at 140 °C, and discoloration is graded against a reference table. It pairs with copper-strip corrosion testers and specific chromatograph workflows cited in transformer-oil quality programs.
What SH/T does not cover - and where confusion starts
Dielectric breakdown voltage-the test most field crews associate with a "transformer oil tester"-falls under GB/T 507 (power-frequency breakdown) and DL/T 429.9 in the power sector, not SH/T. ASTM D877, D1816, and IEC 60156 govern electrode geometry and ramp rate for BDV instruments sold globally. An automatic 80 kV BDV tester is therefore a GB/T/IEC/ASTM conversation; an oxidation bath or Karl Fischer titrator is an SH/T conversation.
