You’re absolutely right — on-site, operational measurements of both moisture and particle contamination are far more valuable for condition-based maintenance than occasional lab samples. Moisture and particles can change quickly with load, temperature and seal/wear conditions, and measuring both together (water activity or ppm plus cleanliness per ISO 4406) gives a much clearer, actionable picture of oil condition. That combined insight helps distinguish transient contamination from developing faults and prevents misinterpretation that can occur when you look at moisture or particles in isolation.

For a compact field solution that covers both parameters, the TOR-6 is designed to measure active water (0–1 aw) and solid particle contamination with ISO-class outputs, with a moisture accuracy around ±10% (or ±10 ppm at 20 °C) and a calibrated particle range consistent with ISO 4406/NAS/SAE standards; it accepts oils in a wide viscosity range (about 1–1000 mm²/s), making it suitable for many mineral- and ester-based hydraulic fluids. A few practical cautions: the unit is specified in a transformer-oil context, so verify compatibility with any synthetic or heavily-additized hydraulic fluids you use, ensure representative sampling and temperature control during measurement, and keep instruments calibrated and validated against lab references during commissioning. If you also need dissolved gases or hydrogen diagnostics, there’s a more comprehensive model (TOR-7) that adds those capabilities for broader fault detection.

Enables phase shift, neutral availability, reduces harmonics, and suits LV distribution.

Load currents increase copper (I²R) losses and stray losses. Thermal rise accelerates oil aging and insulation degradation, raising dielectric losses.

The secondary winding has more turns than the primary, boosting voltage while current decreases proportionally to conserve apparent power minus losses.

Medium power transformers (typically 5-60 MVA, MV/HV interfaces) are installed in sub-transmission and distribution substations. They reduce transmission voltages to feeder voltages for industry and cities, forming a key intermediate step between bulk transmission and final distribution.

Cost is driven by kVA/MVA rating, voltage class, insulation level, cooling system, and special features like OLTCs, online monitoring, and seismic or fire requirements. Copper and core steel market prices significantly influence base cost. Custom vector groups, multiple windings, higher efficiency (low-loss) designs, and stringent test requirements add expense. Logistics, such as transportation constraints, site access, and installation complexity, also factor into the total procurement price seen by industrial customers.

Common cooling methods include ONAN (oil natural air natural), ONAF (oil natural air forced), OFAF (oil forced air forced), and OFWF (oil forced water forced). Dry-type units use AN (air natural) or AF (air forced). Radiators, fans, oil pumps, and heat exchangers enhance heat removal and allow higher loading. Some large units use directed oil flow and internal ducts to manage winding hotspots. Cooling class is a key specification, directly influencing kVA rating and overload capacity.

Apparent power for single phase is S=VI; for three phase S=?3VI. Real power depends on power factor and losses.

The TOR-80, TOR-2, and TOR-3 analyzers are available for immediate production. Each device complies with IEC standards. We will provide detailed pricing, delivery time, product documentation, and packing information. The Reid vapor pressure unit can be offered separately upon confirmation of specification.

The TOR-3 measures the dissipation factor (tan delta) of transformer oil and dielectric fluids in accordance with IEC standards. We will assist with the purchase process and provide technical documentation and pricing.