Transformers are key equipment in power systems. To keep them running well and last longer, you need to use them the right way. Whether you have an oil-immersed or dry-type transformer-such as the main products from Zhejiang LVMA Electric Co., Ltd. (LVMA): 30-2500kVA/10kV Class II Energy-Efficiency Oil-Immersed Transformer, 50-2500kVA/35kV Resin Casting Dry Type Power Transformer, or 100-2500kVA/10kV On-Load Tap-Changing Dry Type Transformer-following standard steps and safety rules is very important. LVMA has 17 years of experience making transformers and holds ISO 9001 certification. The company always puts safety and practical use into its product design. Below is an easy step-by-step guide and key safety tips to help you use transformers correctly.
I. Step-by-Step Transformer Operation Guide
1. Pre-Commissioning Preparation
Before using a transformer, you must do these basic checks:
Read the Manuals: It's necessary to carefully read the operation manuals for both the transformer and its control box (panel). Different models have different technical details. For example, the wiring of LVMA's popular dry-type model-the 50-2500kVA/35kV Resin Casting Dry Type Power Transformer-is different from oil-immersed ones. LVMA's manuals are easy to use and understand, which shows the company cares about safe operation and how users feel.
Check Wiring and Grounding: Connect the wires exactly as the manual says. Make sure the grounding wire is installed properly. This is vital to prevent electric shocks and equipment damage. Grounding is especially important for high-voltage models like the 30-2500kVA/10kV Class II Energy-Efficiency Oil-Immersed Transformer. This product meets global safety standards, and correct grounding is needed for it to work safely.
2. Power Supply and Voltage Adjustment
Control Box Power Supply: Dry-type transformers (like the 100-2500kVA/10kV On-Load Tap-Changing Dry Type Transformer) usually have two power choices for the control box: AC 220V or 380V. Double-check the right voltage before wiring-otherwise, the equipment might burn out. This model uses more than 40 patents from LVMA, so its voltage control works stably and reliably.
Voltage Regulation Operation: For transformers with on-load tap-changing (such as the 100-2500kVA/10kV On-Load Tap-Changing Dry Type Transformer), adjust the output voltage with the voltage regulator connected to the transformer's low-voltage input. Use the transformation ratio to fine-tune the voltage until it reaches the rated value that fits your system. Even for energy-saving oil-immersed models like the 30-2500kVA/10kV Class II Energy-Efficiency Oil-Immersed Transformer, proper voltage adjustment can stop overloading. Led by R&D director Mr. Ye Jinfei (who helped create China's GB standards), LVMA focuses on new technologies. This makes the voltage control of this model very accurate.
3. Special Test Procedures (DC Withstand Voltage & Leakage Current Tests)
If you need to do DC withstand voltage or leakage current tests (common ways to check quality), follow these steps:
Test Connection: Connect the high-voltage silicon rectifier, microammeter, and rotating parts to the transformer's high-voltage output. This works for both dry-type and oil-immersed transformers, including the 50-2500kVA/35kV Resin Casting Dry Type Power Transformer. All LVMA products are fully tested before being sent out, which shows the company's strict quality control.
Voltage Application: Increase the voltage slowly during the test. Sudden voltage jumps can damage the equipment or the test sample. This careful way protects the transformer's insulation layer-a key advantage of LVMA's resin-cast dry-type models. With 17 years of production experience, LVMA has a lot of knowledge in transformer insulation design. Its products have strong insulation.
II. Key Safety Warnings for Transformer Use
1. Interpreting Sounds During Withstand Voltage Tests
Transformers may make three types of sounds during withstand voltage tests. Knowing what they mean helps you check safety quickly:
"Crackling" sound: This is air ionization. If the sound lasts for one minute without any breakdown, the transformer (like the 30-2500kVA/10kV Class II Energy-Efficiency Oil-Immersed Transformer) meets national and international standards. As an ISO 9001-certified company, LVMA strictly follows these standards in production.
"Hissing" sound: This means air stream discharge. Even if it passes the one-minute test, transformers making this sound have more long-term risks.
"Pop" sound: A loud, sharp noise with sparks means insulation or air breakdown. Stop the test right away to avoid serious equipment damage.
2. Causes of Excessive Noise and Solutions
Too much noise during withstand voltage tests mostly comes from not enough space between the transformer's high-voltage and low-voltage coils. The electric field strength (E) is calculated as E = U/D (U = voltage, D = distance between electrodes). If D is too small, E goes beyond the air's limit (about 0.7KV/mm under normal conditions), which causes ionization.
For models like the 50-2500kVA/35kV Resin Casting Dry Type Power Transformer, insulation depends on both air and composite materials (inner and outer coil insulation layers). LVMA's design team uses over 40 patented technologies to optimize air gaps. They strictly follow technical rules to reduce noise and safety risks. For the 100-2500kVA/10kV On-Load Tap-Changing Dry Type Transformer, regular checks of the tap-changer (a key part improved by LVMA's R&D team) and insulation layers also help prevent strange noise.
3. General Safety Precautions
Safety first when operating high-voltage transformers: Wear protective gear like insulating gloves and goggles. Keep the working area dry.
Don't overload energy-saving models like the 30-2500kVA/10kV Class II Energy-Efficiency Oil-Immersed Transformer. This keeps their energy-saving performance and makes them last longer. LVMA's products are known for durability and are sold in many countries, including those in Europe, the Middle East, and Southeast Asia.
Check insulation layers, wiring, and cooling systems regularly. This is especially important for dry-type transformers used in harsh industrial environments. With experience in global markets, LVMA's transformers are designed to work in different conditions.