Tongxin Machinery provides high-quality and cost-effective construction equipment, including concrete batching plants and stabilized soil mixing stations. Contact us for customized solutions.
science avenue, shangjie district, Zhengzhou city, henan province
A scientific and reasonable power configuration is the foundation for efficient and stable operation of a concrete mixing plant. As a professional supplier of concrete machinery and equipment, Tongxin Machinery, drawing on years of industry experience, provides detailed analysis of the key points in mixing plant power calculation and transformer selection, helping you achieve energy savings, reduce consumption, and maintain safe production.
I. Composition and Calculation Key Points of a Mixing Plant's Total Power
The total power of a mixing plant is not the power of a single main unit, but the sum of the rated power of all electrical equipment. Accurately calculating the equipment power is the first step in transformer selection.
1.1 List of Major Electrical Equipment
- Mixer: Core electrical equipment, consuming the most power.
- Conveying System: Includes equipment such as inclined belt conveyors and flat belt conveyors.
- Powder Conveying System: Screw conveyors (typically equipped with 2-4 units).
- Liquid Supply System: Auxiliary equipment such as water pumps and admixture pumps.
- Pneumatic System: Power equipment such as air compressors.
- Control System: Automation and lighting equipment.
1.2 Key Calculation Factors
In actual production, all equipment rarely operates at full capacity simultaneously. It is recommended to use the necessary factor (typically 0.65-0.85) for scientific calculations to avoid oversizing the transformer and wasting resources.
II. Overview of Mixing Plant Power Supply and Transformer Configuration
The following is a reference table based on industry standard configurations. Please refer to the actual equipment list for details:
Mixing Plant Model | Cement Silo Configuration | Power Range (kW) | Recommended Transformer (kVA) |
HZS25 | 1 Cement Silo | 45-60 | 80-100 |
HZS35 | 1 Cement Silo | 55-75 | 100-125 |
HZS50 | 2 Cement Silos | 80-105 | 125-160 |
HZS60 | 2 Cement Silos | 95-120 | 160-200 |
HZS75 | 2-3 Cement Silos | 120-135 | 200-250 |
HZS90 | 3 Cement Silos | 145 | 200-250 |
HZS120 | 3-4 Cement Silos | 180-200 | 315-400 |
HZS180 | 4 or More Cement Silos | 235 | 400-500 |
HZS240 | 4 or More Silos | 275 | 500-630 |
III. Practical Calculation for Transformer Selection (Using the HZS120 as an Example)
It is recommended to use the following formula for accurate calculation:
Transformer Capacity (kVA) = Total Power (kW) × Required Power Factor / Power Factor
Using the HZS120 Concrete Batching Plant as an example (total power of 200kW):
- Required Power Factor = 0.75
- Power Factor = 0.9
- Theoretical Calculation: 200 × 0.75 / 0.9 ≈ 166.7 kVA
It is recommended to select a 315 kVA or 400 kVA transformer. kVA transformers, taking into account the following practical factors:
- Sudden surge in equipment startup current
- Future capacity expansion requirements
- National standard capacity sequence
IV. Five Key Factors Affecting Transformer Selection
1. Power Supply Distance: The longer the line, the greater the voltage drop, requiring an appropriate increase in transformer capacity.
2. Grid Quality: Areas with unstable voltage require a larger transformer capacity.
3. Other Station Loads: Power consumption for offices, laboratories, etc. should be included in the total load.
4. Ambient Temperature: Derating may be required in high-temperature environments.
5. Production Nature: Continuous and intermittent production have different transformer requirements.
V. Frequently Asked Questions
Q1: What is the minimum transformer capacity for the HZS90 concrete batching plant?
A: Theoretically, 160 kVA meets basic requirements, but Tongxin Machinery recommends selecting a 250 kVA or higher transformer to ensure smooth startup and long-term stable operation.
Q2: What are the risks of oversizing the transformer capacity?
A: This can lead to a "big horse pulling a small cart" phenomenon, increasing basic electricity costs, initial investment, and no-load losses.
Q3: Can a single transformer power two production lines?
A: Yes, but this requires professional calculation. Two HZS120 production lines typically require a 500-800 kVA transformer, and the current surge when starting both simultaneously must be assessed.
Conclusion
When selecting a transformer for a concrete batching plant, we recommend:
1. Request a detailed list of electrical equipment from the equipment Manufacturer .
2. Reserve capacity based on future development plans.
3. Consult a professional electrical engineer for accurate calculations.
4. Select a high-quality transformer that meets national standards.
Selecting the right transformer is crucial for safe production and energy conservation in concrete batching plants. As a professional supplier of concrete machinery and equipment, Tongxin Machinery provides one-stop equipment configuration and technical support services.
