69kv 66kV Power Transformer

Engineered to withstand high ambient temperatures, with a peak threshold of 47.8°C, and equipped for operation within an area characterized by very high pollution levels. Its exterior is coated with C4 standard paint thickness, providing effective protection against moisture and corrosion, especially in coastal regions. The transformer incorporates a 13-speed on-load voltage regulating switch for optimal performance and flexibility. Cooling options encompass both ONAN (Oil Natural Air Natural) and ONAF (Oil Natural Air Forced) types. The power rating reaches 12.5 MVA (12500 kVA) when employing ONAN cooling and goes up to an impressive 15 MVA (15000 kVA) with ONAF cooling.

The SFZ-10000/13300 kVA 69kV/4.16kV transformer, a three-phase transformer manufactured by Daelim Transformer, adheres to IEEE C57 and CSA C88 standards. Its primary winding operates at 69GrdY39.84 kV, with a secondary winding at 4.16(kV) Delta. The transformer employs copper windings for optimal performance.

Purchased by an EPC customer in Canada, this 10000 kVA 69 kV transformer serves as a crucial station transformer within a 69KV substation, facilitating connectivity to the Hydro Quebec grid via a 69 kV transmission line.

In the context of the project's northern Quebec setting, characterized by typically mild summers and extremely cold winters, the 10000 kVA 69 kV transformer demonstrates robust operational capability within the ambient temperature range of -40°C to 30°C. KI45 oil, along with a C5-level external paint finish, enhances its durability. The transformer incorporates a 12-step tap changer and features ONAN/ONAF cooling, achieving a power rating of 10000 kVA at 65℃ according to ONAN, and 13300 kVA with ONAF cooling.

Specialized accessories include an 8-channel Hot Spot Monitoring System, addressing the critical need to monitor transformer winding hot spots. Transformer protection against damage and overuse hinges on the accurate assessment of these hot spots, as the lifespan of insulating paper within the transformer is intimately tied to temperature control. Traditional temperature measurement methods often offer indirect calculations, but accurate optical fiber temperature measurement devices provide real-time monitoring of hot spots. By swiftly detecting temperature anomalies and triggering alarms and relays, these devices ensure the safeguarding of transformer equipment.

The S11-12000 kVA-66-kV-12.47-kV transformer is a specialized product manufactured by Daelim Transformer, tailored to meet the unique needs of its Canadian customer. The 12 MVA transformer operates at a primary voltage of 66 kV and steps down the voltage to 12.47 kV while providing a capacity of 12 MVA. These transformers are from a Canadian customer who ordered three units in total from Daelim Transformer. The application is installed in a substation in a relatively large crypto mine in British Columbia, Canada.

• Designed and constructed in compliance with IEEE and CSA standards.
• Equipped with copper windings for enhanced performance and durability.
• Utilizes Oil-Natural Air-Natural (ONAN) cooling methods for efficient heat dissipation.
• Features a High Voltage Basic Insulation Level (HV BIL) of 325 kV and a Low Voltage Basic Insulation Level (LV BIL) of 95 kV.
• Operates with a Dyn1 vector group.
• Weighs approximately 22,000 kilograms (kg).
• Equipped with a five-position tap changer switch to accommodate varying voltage needs.
• Adopts a top-mount design for high-voltage connections and a side-mount design for low-voltage connections.

The transformer is equipped with a range of safety and reliability features, including explosion-proof wireways, gauges with contacts, and a control box on the low-voltage side. Additionally, the transformer's instrumentation system incorporates both digital and analog signals, such as winding temperature, oil temperature, level, and pressure. This comprehensive instrumentation allows for remote monitoring of the operational status of the 66 kV 12 MVA transformers, ensuring enhanced safety and reliability.

The primary objective was to step down the incoming 66 kV supply to 12.47 kV for distribution to four 3000 kVA pad-mounted transformers, which would then power the cryptocurrency mining machines.

Specific accessories needed to be explosion-proof to meet safety requirements.

The customer had precise demands for gauges and valves to monitor and control the transformer.

The project required swift submission of drawings and a very short delivery time frame.

The 12 MVA 66 kV transformer underwent a comprehensive testing regime to ensure its reliability and performance. Testing included ratio, polarity, phase relation, winding resistance measurement, insulation power factor, impulse tests, potential tests, load loss and impedance measurements, gas analysis (DGA test), leakage test, and control cabinet tests.

To facilitate delivery, the transformer was carefully packaged in an open-top container, and detachable parts were shipped in a separate 20 ft container.