10kVA Three-Phase Full Copper Isolation Transformer Test Report: The Precision Journey from 380V to 220V

Table of Contents

1. Project Background: Understanding the Custom Requirement

2. Core Specifications: 10kVA Three-Phase Full Copper Isolation Transformer

3. Product Highlights: Innovative Design & Detailed Configurations

4. Test Data Analysis: Output Voltage, Voltage Drop & Three-Phase Balance

5. Conclusion: Performance Verification and Qualification

6. Frequently Asked Questions (FAQ)

1. Project Background: Meeting Precision Voltage Demands

In industrial applications, voltage conversion is often the first critical step for equipment compatibility. Recently, LINKWELL received a custom order from a client needing to convert standard three-phase 380V industrial power to three-phase 220V output to accommodate specific imported machinery or overseas project requirements.

Following rigorous design and production, two units of our Three-Phase Full Copper Isolation Transformer (rated at 10kWA/10kVA) were successfully assembled at the LINKWELL factory and moved into the final testing phase. This article takes you directly to the testing site to witness the performance of LINKWELL transformers in action.

2. Core Specifications: Built for Stability

The two transformers tested represent a typical customized isolation transformer solution, with the following core parameters:

• Product Type: Three-Phase Full Copper Isolation Transformer

• Brand: LINKWELL

• Rated Power: 10kW (10kVA)

• Input Voltage: Three-Phase 380V (Standard Industrial Input)

• Output Voltage: Three-Phase 220V (Customized Output)

• Output System: Three-Phase Five-Wire System (3 Phases + N + PE), meeting stringent grounding safety requirements

• Insulation Class: Compliant with international isolation transformer standards

3. Product Highlights: More Than Just Voltage Conversion

At LINKWELL, we believe a great transformer is not just a tool for voltage change, but a guarantee of safety and durability. The units tested feature multiple optimizations:

? LINKWELL Self-Developed KE Terminals

We equipped the transformers with our proprietary KE terminals. These terminals ensure a secure connection with minimal contact resistance. Their unique structural design simplifies installation and maintenance, showcasing LINKWELL's expertise in developing electrical components.

?️ Active Cooling System

Considering the temperature rise at 10kVA, we integrated a dedicated cooling fan. Combined with a rugged metal enclosure, this ensures the unit maintains a "cool" operational state even during prolonged full-load operation.

? Waterproof Connectors

Both the input and output ends utilize waterproof connectors. This design effectively prevents dust and moisture ingress, significantly extending the transformer's service life in challenging industrial environments.

? Intuitive Status Indication

The control panel features clear Input and Output indicator lights. Operational status is instantly visible, allowing for quick inspections and troubleshooting by on-site engineers.

4. Test Data Analysis: Let the Numbers Speak

Testing is the final and most critical checkpoint before a transformer leaves our facility. Our technicians conducted rigorous load tests on both units:

• Test Equipment: Digital Voltmeter (High Precision)

• Test Objective: Verify no-load and loaded output voltage, as well as three-phase balance.

On-Site Test Log

*"As you can see, the output voltage is three-phase 220V. We intentionally apply a voltage drop of between 2% to 3%. This accounts for the normal voltage dip expected under full load."*

Test results show:

• Measured Voltage: 225V (No-load/Light-load condition)

• Designed Voltage Drop: A 2%-3% engineering margin is reserved, ensuring the output stabilizes precisely at 220V under full rated load.

• Three-Phase Balance: All three phases measured around 225V, with minimal fluctuation. This confirms the precision of our winding process and the excellence of the magnetic circuit symmetry.

Test Conclusion

After rigorous functional testing and parameter verification, all performance indicators for these transformers passed qualification standards. Voltage accuracy, three-phase balance, and insulation resistance all meet or exceed the client's technical specifications.

5. Why Choose LINKWELL Isolation Transformers?

1. 100% Full Copper Windings: We never substitute aluminum for copper. This guarantees higher conductivity, lower heat generation, and a significantly longer lifespan.

2. Galvanic Isolation: Primary and secondary windings are electrically isolated, effectively suppressing grid harmonics and protecting downstream equipment.

3. Flexible Customization: Input/output voltages, terminal types, and protection levels can all be tailored to your specific needs.

4. Rigorous Testing: Every LINKWELL transformer undergoes a complete testing process, just like the one detailed in this report, before shipment.

Frequently Asked Questions (FAQ)

Q1: What is an isolation transformer? How is it different from a standard autotransformer?
A: An isolation transformer has primary and secondary windings that are electrically separate. Its main purposes are safety isolation and interference suppression. In the event of an electrical fault, it prevents the formation of a shock circuit, greatly enhancing personal safety. The transformer tested here is a prime example.

Q2: Why was the output voltage measured at 225V instead of exactly 220V?
A: This is an intentional engineering reserve. Transformers have slightly higher voltage under no-load conditions. When a load is applied, the voltage naturally drops slightly due to the coil's internal resistance. LINKWELL reserves a 2%-3% voltage drop margin to ensure the load receives a precise 220V at full capacity.

Q3: What does "Three-Phase Five-Wire System" mean? Why is it important?
A: A three-phase five-wire system consists of three phase lines (A/B/C) + one Neutral line (N) + one Protective Earth line (PE) . This system strictly separates the working neutral from the protective ground, offering much higher safety compared to the older three-phase four-wire system. It is the standard requirement in modern industrial power distribution worldwide.

Q4: Does the cooling fan make the transformer very noisy?
A: The fans selected by LINKWELL are low-noise models and are typically controlled by a thermostat. They only activate when the internal temperature reaches a set point and remain off under normal conditions. This design ensures effective cooling when needed while maintaining quiet operation.

Q5: Can I customize other voltage specifications, for example, 660V input to 400V output?
A: Absolutely. LINKWELL has extensive experience with custom projects. Simply provide us with your input voltage, output voltage, required power (kVA), and application scenario. Our engineering team can design the optimal solution for you.