The following eight core parameters are foundational to the design, selection, and safe operation of CHH Power’s power transformers. They directly determine the transformer’s performance, energy efficiency, and service life—CHH Power strictly adheres to these parameters in product development and quality control. Below is a clear, technical breakdown of each parameter.
1. Operating Frequency
- Definition: The specific frequency for which the transformer is designed and used, as core loss is closely related to frequency.
- Key Note: CHH Power optimizes core material (silicon steel sheet) and structural design based on the operating frequency (e.g., 50Hz for mainstream power grids) to minimize core loss and ensure stable performance.
- Application Compliance: Transformers must be used in line with their rated operating frequency—mismatched frequency leads to excessive loss or overheating.
2. Rated Power (kVA)
- Definition: The maximum output power that the transformer can deliver continuously under specified frequency and voltage, without exceeding the rated temperature rise.
- CHH Design Standard: All products are tested to ensure long-term operation at rated power, with temperature rise strictly controlled per IEC/GB standards (e.g., ≤65K for oil-immersed transformers).
- Practical Significance: Serves as the primary reference for matching transformers to load demands—CHH Power offers a full range of rated power options (50kVA–2500kVA) for diverse scenarios.
3. Rated Voltage (kV/V)
- Definition: The maximum voltage allowed to be applied to the transformer’s primary/secondary coils during operation.
- Key Specifications: CHH Power marks rated voltages for both high-voltage and low-voltage windings on product nameplates (e.g., 10kV/0.4kV).
- Safety Requirement: Operating voltage must not exceed the rated value—overvoltage causes insulation degradation or breakdown.
4. Voltage Ratio
- Definition: The ratio of the transformer’s primary voltage to secondary voltage, divided into no-load voltage ratio (secondary open-circuited) and load voltage ratio (secondary loaded).
- CHH Calibration Standard: Voltage ratio is precisely calibrated during production to ensure accurate voltage conversion (allowable error ≤±0.5%).
- Practical Role: Determines the transformer’s step-up/step-down function—CHH Power customizes voltage ratios to match grid and load requirements.
5. No-Load Current (A/%)
- Definition: The current flowing in the primary winding when the secondary is open-circuited. It consists of magnetizing current (to generate magnetic flux) and iron loss current (caused by core loss).
- Key Characteristic: For 50Hz power transformers (CHH’s mainstream models), the no-load current is nearly equivalent to the magnetizing current (iron loss current is negligible).
- CHH Performance Index: No-load current is controlled to ≤3% of rated primary current for most models, reflecting high magnetic circuit efficiency.
6. No-Load Loss (kW)
- Definition: The power loss measured at the primary winding when the secondary is open-circuited.
- Loss Composition: Dominated by core loss (hysteresis + eddy current loss); copper loss from no-load current is minimal and negligible.
- CHH Optimization: Through high-quality silicon steel sheets and optimized core structure, CHH’s transformers achieve ultra-low no-load loss (compliant with Grade 1 energy efficiency standards).
7. Efficiency (%)
- Definition: The percentage of the secondary output power (P2) relative to the primary input power (P1) (Efficiency = P2/P1 × 100%).
- Key Trend: Efficiency increases with rated power—CHH Power’s large-capacity transformers (≥1000kVA) achieve efficiency ≥99%.
- Significance: Directly impacts energy consumption—CHH’s high-efficiency transformers reduce operational costs for users.
8. Insulation Resistance (MΩ)
- Definition: A measure of insulation performance between windings, and between windings and the iron core.
- Influencing Factors: Related to insulating material quality, operating temperature, and humidity.
- CHH Test Standard: Insulation resistance is tested with a 2500V megohmmeter before delivery—minimum value ≥100MΩ to ensure no insulation defects.
Critical Application Notes
- All parameters are marked on CHH Power’s product nameplates and technical datasheets for easy reference.
- Parameter matching is critical for selection: e.g., rated power must cover load demand, operating frequency must align with the grid.
- Regular maintenance should monitor key parameters (e.g., insulation resistance, no-load loss) to track transformer health.