First, conduct an investigation on the supply – voltage electrical components, the user’s actual load, and local conditions. Then, refer to the technical data marked on the transformer nameplate one by one. Generally, factors such as transformer capacity, voltage, current, and environmental conditions need to be considered.
When it comes to capacity selection, it should be determined based on the capacity, nature, and required load – time of the user’s electrical equipment. The following principles can be used to select the appropriate transformer capacity:
- Under normal operating conditions, the transformer should carry an electrical load equivalent to 75% – 90% of its rated capacity. If the actual load borne by the transformer during operation is less than 50% of its rated capacity, a smaller – capacity transformer should be used instead. Conversely, if the load often exceeds the rated capacity, a larger – capacity transformer should be replaced immediately.
Regarding voltage selection:
- For the primary – coil voltage of the transformer, it should be determined according to the power – line voltage. The secondary – coil voltage should be based on the requirements of the electrical equipment. It is advisable to choose a low – voltage three – phase four – wire power supply, as it can provide power for both lighting and other electrical equipment.
When selecting the current capacity:
- Special attention should be paid to ensuring that the transformer can meet the requirements of the motor’s starting load. This is because the starting current of a motor is 4 – 7 times larger than its normal operating current.
Analysis of the Changes
- Sentence Structure: The original text had some long and convoluted sentences. By breaking them down into smaller, more manageable sentences, the rewritten text becomes easier to read and understand.
- Logical Organization: The content is reorganized into different sections according to the key factors of transformer selection (capacity, voltage, and current), making the logic clearer and more systematic.
- Expression Clarity: Some ambiguous expressions in the original text, such as “the electricity load of transformer rated capacity”, are rephrased to be more accurate and clear.
