A 630kVA 3-Phase Distribution Transformer On Load Tap Changer (OLTC) is a vital electrical component used for power distribution in medium-voltage networks. Designed to step down high-voltage electricity from the primary distribution grid to a usable voltage level for commercial, industrial, and residential applications, this transformer ensures reliable and efficient power delivery. Its 630kVA rating indicates a capacity to handle significant electrical loads, making it suitable for small to medium-scale industries, apartment complexes, hospitals, and utility substations.
One of the standout features of this transformer is its On Load Tap Changer (OLTC). This mechanism allows the transformer to adjust its output voltage without interrupting the power supply. It continuously monitors load conditions and compensates for voltage fluctuations by varying the transformer’s winding taps. This dynamic voltage regulation ensures stable output even during peak loads or grid instability, enhancing equipment protection and power quality for end users.
Constructed with high-grade CRGO silicon steel core and electrolytic copper windings, the transformer offers excellent magnetic properties, low core losses, and high electrical conductivity. This results in improved efficiency and reduced energy loss during operation. The oil-immersed design with natural air cooling (ONAN/ONAF) provides effective thermal management, extending the transformer's operational life and reducing maintenance needs.
The transformer's HV and LV windings are insulated with top-grade materials to withstand thermal and electrical stresses. It is also equipped with standard protection devices such as Buchholz relay, pressure relief device, oil level indicator, temperature gauge, and breather. These features ensure safe operation and quick detection of faults.
Environmentally sealed with an oil-tight tank, the transformer is designed to endure harsh weather, dust, and moisture, making it suitable for both indoor and outdoor installations. It complies with international standards like IS 1180 (Part-1), IEC 60076, and is typically tested for parameters such as insulation resistance, voltage ratio, impedance, load loss, and no-load loss.
In modern power networks, where voltage fluctuations can damage sensitive equipment and affect overall system stability, the 630kVA OLTC distribution transformer plays a key role. Its capability to regulate voltage under load conditions not only supports uninterrupted operations but also contributes to energy efficiency and system reliability.