A station service transformer, also known as a substation station service power transformer, is typically a dry-type 30-50KVA transformer that directly draws power from the busbar. Its secondary side usually has one or two windings (0.4kV or 0.1kV), primarily used for lighting or control/protection systems.
Functions of Station Service Transformers:
Provide electricity for daily life and production within the substation.
Supply AC power to substation equipment, such as protection panels, energy storage motors in high-voltage switchgear, SF6 switch energy storage systems, and on-load tap changers of main transformers that require operational power.
Charge DC systems.
Advantages and Disadvantages of Dry-Type vs. Oil-Immersed Transformers:
Cost: Dry-type transformers are more expensive than oil-immersed ones.
Capacity: Large-capacity oil-immersed transformers are more common.
Installation Environment:
Dry-type transformers are required in integrated buildings (basements, floors, rooftops) and densely populated areas.
Oil-immersed transformers are used in standalone substations.
Box transformers are typically oil-immersed.
Oil-immersed transformers are preferred for outdoor temporary power supply.
Space Consideration: Choose oil-immersed transformers in spacious areas and dry-type in confined spaces.
Climate: Oil-immersed transformers are suitable for humid and hot regions. If dry-type transformers are used in such climates, forced air cooling equipment must be installed.
Characteristics of SCB10 Dry-Type Station Service Transformers:
Coils are wound with copper wires or foil, reinforced with fiberglass, and integrally cast using epoxy resin without fillers through vacuum drying, degassing, and dehumidification processes. They feature high mechanical strength, excellent short-circuit resistance, and impact resistance.
High-voltage windings have copper inserts 预埋 at the start, end, and intermediate tapping points, ensuring rigidity, easy tap adjustment, and neat appearance.
The core is made of high-quality grain-oriented cold-rolled silicon steel sheets with 45-degree fully inclined multi-step joints. The surface is coated with a resin insulation layer to resist moisture, prevent rust, and reduce noise.
The core, clamping parts, and coils are clamped with elastic components to maintain the coils in a stable and compressed state, minimizing noise.
The transformer is designed for natural cooling. The integrally cast high/low-voltage coil barrels have longitudinal ventilation ducts inside and can be equipped with a forced air cooling system (cooling fans). With forced cooling, the output capacity can be increased by 20%.
Equipped with a temperature controller, a platinum resistor (Pt100) is placed in the 预埋 hole at the top of the low-voltage coil to monitor winding temperature rise. It automatically starts/stops the cooling fans and provides fault alarms, overtemperature alarms, and overtemperature tripping functions, ensuring reliable overload protection for the dry-type transformer and enhancing operational safety.
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