Tests Conducted on a Transformer Comprehensive Test Bench

A transformer comprehensive test bench is a versatile platform designed to evaluate the performance and safety of power transformers. It integrates advanced industrial control systems to conduct a variety of tests with high precision and safety. The following are the primary tests that can be performed:

1. Basic Performance Tests

• No-Load Test: Determines core losses and magnetizing current under standard operating conditions without load.

• Load Test: Evaluates the transformer's behavior under load, including voltage regulation and efficiency.

• Transformation Ratio and Polarity Test: Verifies the transformation ratio between primary and secondary windings and ensures the correct polarity.

• DC Resistance Test: Measures the resistance of windings to identify potential issues like poor connections or winding faults.

• Features:

  • Automated measurement and data processing through an industrial control computer.
  • Real-time control and monitoring of the entire testing process.
  • Automatic storage and printout of test data for analysis and documentation.

2. Power Frequency Withstand Voltage Test

• Purpose: To assess the transformer's insulation strength under power-frequency voltage conditions.

• Test Execution:

  • Gradual voltage increase and timed voltage application using automated systems.
  • Ensures the insulation can handle expected operational voltage levels safely.

• Safety Features:

  • Zero-position protection to prevent unintentional high-voltage application.
  • High-voltage leakage current monitoring and automatic shutdown for anomalies.
  • Overvoltage and overcurrent protection for enhanced safety.

3. Induced Voltage Withstand Test

• Purpose: Tests the transformer's ability to withstand overvoltages induced during operation.

• Test Execution:

  • Conducted using a 150Hz intermediate frequency generator to simulate operating conditions.
  • Focuses on the insulation between windings under elevated voltage stress.

• Safety Features:

  • Enhanced safety protocols managed by industrial control computers.
  • Ensures the reliability of test conditions and mitigates risks associated with high-voltage testing.

Summary

The transformer comprehensive test bench is an indispensable tool for power transformer diagnostics. It covers a wide range of essential tests:

1. Basic tests: no-load, load, transformation ratio, polarity, and DC resistance.
2. Power frequency withstand voltage test for insulation strength evaluation.
3. Induced voltage withstand test for high-voltage performance under simulated conditions.

By leveraging automated systems and robust safety measures, the platform ensures precise, reliable, and safe testing, making it an essential resource for transformer maintenance and quality assurance.