All transformer equipment is equipped with standard nameplates indicating core operating parameters. Understanding the nameplate is the foundation for model selection, acceptance, operation, and maintenance. In this issue, we will provide a popular interpretation of core parameters to avoid common misunderstandings in engineering.
1. Rated capacity (kVA): The core specification of a transformer, representing the maximum apparent power it can bear, and determining how much load it can carry. A common misconception is that capacity equals actual power consumption. Affected by the power factor, under normal operating conditions, a 1000kVA transformer's actual effective load is around 800kW. When selecting models for engineering projects, a margin of about 20% should be reserved to avoid long-term full-load operation.
2. Rated voltage (kV): Indicate the standard voltage on the high-voltage side and low-voltage side, commonly seen as 10kV/0.4kV. It represents the rated input and output voltage for normal operation of the equipment. Excessive voltage deviation can lead to equipment overheating, surge in losses, and shortened lifespan.
3. Rated current (A): The rated working current on the high and low voltage sides is the core basis for configuring switches, cables, and protective devices. It is strictly prohibited to operate at currents exceeding the rated current for extended periods.
4. Impedance voltage and wiring group: The impedance voltage determines the ability to withstand short-circuit stress. The commonly used Dyn11 wiring group has strong adaptability to three-phase imbalance and good harmonic suppression effects, making it suitable for modern industrial, commercial, and photovoltaic power consumption scenarios.
5. In accordance with international energy efficiency standards, the A0 and A1 models, which are low-loss models, consume less energy and save on electricity costs in the long run.
