Electrical Power Transformer

Power transformer specifications include rated power (e.g., 3 MVA to 200 MVA), voltage ratings for primary and secondary windings (e.g., 132 kV / 33 kV), frequency (50 or 60 Hz), cooling type (e.g., oil forced air forced cooling), and installation details (indoor or outdoor). Other important specifications are phases (single or three-phase), tapping options (on-load or off-load), impedance, and vector group (e.g., Dyn11).

Power Tech Electricals (also operating as Power Tech Transformers And Electricals or Powertech Transformers & Controls Pvt Ltd) manufactures a wide range of transformers, so there isn't a single set of specifications. The specifications vary based on the specific transformer's type, power rating, voltage, cooling method, and intended application (industrial, commercial, power distribution). Key specifications often found in their product lines include: Feature Specification Range/Examples Power Rating 63 kVA to over 10 MVA Input Voltage (Primary) 11 kV, 33 kV, 110 kV, 220 kV (customizable) Output Voltage (Secondary) 433 V, 240 V (or variable based on design) Phase Single Phase and Three Phase Cooling Type Oil Cooled (ONAN/ONAF) or Air Cooled (Dry Type) Frequency 50/60 Hz Winding Material Copper or Aluminium Core Material CRGO Steel (Cold Rolled Grain Oriented) Standards Adherence to IS (Indian Standards) and IEC standards (e.g., IEC 60076) Application Industrial, Commercial, Substations, Power Distribution

Key specifications for a three-phase electrical power transformer include its power rating (kVA or MVA), voltage ratings (high and low voltage sides), frequency (typically 50 or 60 Hz), and winding connections (e.g., Delta/Star or Dyn11). Other important specifications are the cooling method (oil or dry type), insulation class, ambient temperature, and applicable standards like IEC or IS. Core specifications Power Rating: Specified in kVA or MVA (e.g., 2500 kVA, 5 MVA). Voltage Ratings: Input (high voltage) and output (low voltage) levels, such as 33 kV and 11 kV or 11/0.433 kV. Frequency: The operating frequency, commonly 50 Hz or 60 Hz. Winding Connections: The configuration of the primary and secondary windings, such as Delta (D) and Star (Y). A common notation is "Dyn11," which indicates a primary Delta, secondary Star, and a 30-degree phase shift with a specific phase sequence. Physical and environmental specifications Cooling Method: How the transformer dissipates heat, such as oil-natural air-natural (ONAN) for outdoor, oil-immersed transformers, or air-cooled for dry-type transformers. Installation Type: Where the transformer is located, such as indoor or outdoor. Insulation Class: The thermal class of the insulation system, such as Class F or H. Ambient Temperature: The maximum expected ambient temperature where the transformer will operate, often around 40C or 50C. Efficiency: Typically high, ranging from 90% to 99% depending on the capacity. Winding Material: The material used for the windings, commonly copper or aluminum.