THIS 2009 VON ROLL TRANSFORMERS LTD. UNIT IS A THREE-PHASE POWER TRANSFORMER ENGINEERED FOR HIGH-VOLTAGE SUBSTATION APPLICATIONS. IT FEATURES A THREE-STAGE COOLING ARCHITECTURE CLASSIFIED AS ONAN/ONAF/ONAF (OIL NATURAL AIR NATURAL / FORCED), WHICH PROVIDES SCALABLE POWER RATINGS OF 25.0 MVA (PASSIVE COOLING), 33.3 MVA (STAGE 1 FANS), AND 41.7 MVA (STAGE 2 FANS). THE UNIT MAINTAINS A 65°C TEMPERATURE RISE LIMIT ACROSS ALL COOLING MODES, ENSURING THERMAL STABILITY UNDER PEAK LOADS.
ELECTRICALLY, THE TRANSFORMER STEPS DOWN VOLTAGE FROM A PRIMARY HIGH VOLTAGE (HV) OF 115 KV (GROUNDED WYE) TO A SECONDARY LOW VOLTAGE (LV) OF 44 KV. CRITICAL TO ITS OPERATION IS THE 33-POSITION ON-LOAD TAP CHANGER (OLTC), WHICH PROVIDES DYNAMIC VOLTAGE REGULATION. THE OLTC ALLOWS FOR "LOW VOLTAGE VARIATION" RANGING FROM 52,800 V (TAP 1) DOWN TO 35,200 V (TAP 33), ACCOMMODATING SPECIFIC GRID REQUIREMENTS AND LOAD FLUCTUATIONS. THE SHORT-CIRCUIT IMPEDANCE IS APPROXIMATELY 7.42% AT THE NOMINAL TAP, OPTIMIZING THE BALANCE BETWEEN VOLTAGE REGULATION AND FAULT CURRENT LIMITATION.
Technical Attributes
Rated Power
41.7 MW
41700 kVA
Primary Voltage
115 kV AC
115 kV AC
Electrical Frequency
60 Hz
60 Hz
# of Phase
Three Phase
Three Phase
Secondary Voltage
44 kV AC
Data Accuracy and Verification
Specifications and technical details are compiled from manufacturer documentation, historical records, and third-party industry sources. While care is taken to ensure accuracy, this information is provided for reference purposes only and may contain errors or omissions. Users should independently verify all details before relying on them.
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Comparable Equipment
2009 VON ROLL TRANSFORMERS LTD TRANSFORMER 41.7MVA 115/44KV 136981 Technical Specifications | Aucto
