Guide to Equipment Configuration for Transformer Periodic Testing Laboratories

Periodic testing of transformers is a key step to ensure stable equipment operation. This type of testing focuses on routine performance verification and does not involve type test items such as temperature rise or impulse testing. Based on practical needs, the laboratory equipment can be configured around two core directions: electrical performance testing and oil condition monitoring, as detailed below:

1. Electrical Performance Testing Equipment: Core Testing Tools

Electrical parameters are the core indicators for evaluating transformer health in periodic testing. The following equipment should be configured:

Insulation Resistance Meter: Tests insulation resistance of windings, bushings, etc., to identify insulation aging or moisture;

Capacitive Voltage Divider/ Power Frequency Capacitive Voltage Divider: Works with voltage-withstanding equipment to measure high-side voltage;

DC Resistance Tester: Tests DC resistance of windings to detect issues like poor contact or inter-turn short circuits;

Automatic Variable-Frequency Dielectric Loss Tester: Detects dielectric loss factor of insulation media to reflect moisture or degradation;

Automatic Turn Ratio Tester: Verifies whether winding turn ratio meets design requirements to avoid voltage matching anomalies;

Current/Voltage Transformer: Cooperates with other devices to measure and convert electrical quantities;

Test Transformer + Power Frequency Withstand Voltage Tester: Conducts power frequency withstand voltage tests on windings and bushings to verify insulation strength;

Multi-Channel Partial Discharge Detector: Detects internal partial discharge signals to identify insulation defects early;

On-Load Tap Changer Characteristic Tester: Tests tap changer parameters (e.g., action time, resistance) to ensure voltage regulation reliability;

Other Auxiliary Equipment: Such as power factor analyzer (tests power factor), winding deformation tester (checks mechanical winding deformation), voltage regulator (adjusts test voltage), transformer capacity tester (verifies equipment capacity), and test console (integrates test control functions).

2. Oil Testing Equipment: Essential for Oil Condition Monitoring

Transformer oil is critical for insulation and cooling, and its condition directly affects equipment safety. The following oil analysis equipment should be configured:

Oil Chromatograph Analyzer: Detects dissolved gas components (e.g., methane, acetylene) in oil to identify internal fault types (overheating, discharge, etc.);

Oil Dielectric Strength Tester: Tests oil breakdown voltage to evaluate insulation performance;

Oil Dielectric Loss Tester: Detects dielectric loss factor of oil to reflect contamination or aging;

Moisture Tester: Measures water content in oil to prevent insulation degradation caused by moisture;

Flash Point Tester: Determines oil flash point to evaluate safety performance;

Acid Value Tester: Detects oil acid value to judge oxidative degradation;

Surface Tension Tester: Evaluates oil surface tension to assist in judging oil degradation.

3. Non-Essential Equipment: Optional as Needed

The "lightning impulse test transformer"  is a type test device. It is not required if only periodic testing is performed.

With the rational configuration of the above equipment, the transformer periodic testing laboratory can complete core tests (insulation performance, electrical parameters, oil condition, etc.), providing reliable data support for safe equipment operation.

Would you like me to prepare an English version of the core function list for transformer periodic testing equipment for easier selection reference?