Quality appraisal of insulation treatment equipment

insulation treatment equipment is based on the core principle of synergy between dielectric material performance optimization and process stability. By optimizing curing temperature control, vacuum impregnation depth and insulation layer uniformity, it achieves synergy between dielectric strength, aging resistance and environmental compliance of insulation materials. It is widely used in fields such as power transformers, high-voltage cables, motor windings and electronic component packaging. In power equipment, it is used for vacuum pressure impregnation of transformer windings; in the field of new energy, it meets the solvent-free coating requirements for wind turbine motor insulation paint; in semiconductor packaging, it ensures the high-voltage resistance of chip packaging materials. Compared with traditional processes, insulation treatment equipment has the characteristics of high process controllability, excellent material utilization and wide environmental adaptability. It is the core equipment to ensure the safe operation of electrical equipment.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for insulation treatment equipment. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of insulation treatment equipment.

With the upgrade of electrical equipment safety standards, related dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: dielectric strength does not meet the standard, and the curing temperature is out of control;

2, material defects: insulating paint tracking resistance index, environmental protection Oxygen resin filler is unevenly dispersed;

3. Process problems: insufficient vacuum maintenance and impregnation rate deviation;

4. Contract performance dispute: the core module does not comply with the technical agreement.

The quality appraisal of insulation treatment equipment mainly adopts the following technical methods:

1. Appearance inspection: Visually inspect the appearance of the equipment to find out whether there are scratches, deformations, rust and other defects.

2. Electrical performance test: Use insulation resistance tester, dielectric loss meter and other equipment to measure the insulation resistance and dielectric loss of the equipment to evaluate the insulation performance.

3. Mechanical performance testing: Use tensile testing machine, impact testing machine and other equipment to test the mechanical strength and compressive resistance of the equipment.

4. Environmental durability test: Expose the device to extreme environments such as high temperature, low temperature, humidity, etc., and observe its performance changes.

A transformer factory of the applicant signed a "VPI Insulation Treatment System Procurement Contract" with an equipment manufacturer of the respondent, stipulating that the dielectric strength is ≥40kV/mm. After being put into production, the windings of several transformers experienced breakdown. The manufacturer argued that it was caused by improper winding process by the customer.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "insulation treatment equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The pressure during the vacuum impregnation stage of the insulation treatment equipment involved in the case fluctuated to 50Pa (agreement ≤10Pa), resulting in a bubble residual rate of 15%; the CTI value of the insulating paint was only 350V (agreement ≥600V); the curing temperature was partially overheated to 200°C (agreement 180±3°C), and the resin cross-linking degree was insufficient.

The appraisal conclusion determined that equipment process control and material defects were the main causes of breakdown.

Insulation treatment equipment quality appraisal report should include:

1, appraisal purpose (such as breakdown accident attribution, environmental compliance verification) and reference standards;

2, equipment model involved, process parameter records, material batches;

3, testing methods and equipment List (such as withstand voltage tester, SEM);

4, test data and failure correlation analysis (such as the impact of vacuum degree on bubble rate);