Power Transformer
A large transformer (>10 MVA) used in transmission networks for stepping voltage between system levels.
A power transformer is typically >10 MVA, used in transmission networks for voltage stepping. Backbone of the grid enabling efficient long-distance transmission.
Types: GSU, grid interconnection, auto-transformers. Designed for 40+ year life, ratings 10-1,000+ MVA up to 800 kV.
Features: OLTCs, OFAF/ODAF cooling, DGA monitoring, short-circuit withstand.
QDTB manufactures power transformers up to 500 MVA and 500 kV with advanced engineering for maximum reliability.
Related Products
Related Terms
Distribution Transformer
A transformer stepping down voltage from the distribution network (11-33 kV) to utilization voltage (400/230V) for end consumers.
Generator Step-Up Transformer (GSU)
A large power transformer stepping up generator voltage (11-25 kV) to transmission levels for grid connection.
Impedance (%Z)
Total opposition to current flow in a transformer as a percentage, determining fault current and voltage regulation.
Cooling Class (ONAN/ONAF/ODAF)
Standardized codes describing transformer cooling methods: O=Oil, N=Natural, A=Air, F=Forced, D=Directed flow.
More Terms Starting with “P”
Power Factor
The ratio of real power (kW) to apparent power (kVA) indicating how effectively electrical power is utilized.
Partial Discharge (PD)
Localized electrical discharges in small insulation regions not bridging electrodes, indicating defects or aging.
Prefabricated Substation
A factory-assembled complete substation integrating transformer, switchgear, and protection for rapid installation.
Phasor Diagram
A graphical representation of AC voltage and current relationships in a transformer showing magnitude and phase angle.
More in “Transformer Types”
Autotransformer
A transformer with a single winding acting as both primary and secondary, providing voltage conversion through electromagnetic induction and direct electrical connection.
Amorphous Alloy Transformer
A distribution transformer using amorphous metal core material achieving 60-70% lower no-load losses than conventional silicon steel cores.
Box-Type Substation (Prefabricated)
A factory-assembled compact substation integrating transformer, HV/LV switchgear, and protection in a weatherproof enclosure.
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