How to conduct quality appraisal of centralized control and protection equipment

Introduction

Set control protection equipment is an important device that is used to protect electrical equipment and lines from abnormal conditions such as voltage, overcurrent, and short circuit. Its working principle is to monitor the operating status of the protected objects (such as transformers, lines, etc.). Once abnormal parameters or failures are detected, it will move in time to cut off the power supply or take other measures to avoid more severe damage. The same type of products include relay protection devices, circuit breakers, and lightning offers.

Second, litigation quality identification background

Due to the quality problem of collecting control protection equipment that may cause electrical equipment failures and even cause casualties and property losses, related disputes often occur. During the lawsuit, the quality appraisal of the control protection equipment is particularly critical. The purpose of the appraisal is to find out whether the equipment meets relevant standards and requirements, whether there are quality defects or faults, and whether there is a causal relationship with accidents or faults.

Example of judicial dispute points:

Whether the equipment meets the requirements of design, manufacturing, installation and use

Whether the equipment has quality defects or failures

Whether quality defects or faults are directly related to accidents or failures

Is the loss caused by accident or failure?

3. Technical method of litigation appraisal

The quality appraisal of the collection control protection equipment usually uses the following technical methods:

1. On -site investigation: Investigate the scene of the accident or failure, collect traces and evidence at the scene, such as burning equipment, accident scene photos, etc.

2. Equipment testing: Perform electrical performance testing, insulation testing, mechanical performance testing, etc. to determine whether it meets relevant standards and requirements.

3. Failure analysis: Based on the results of on -site investigation and equipment testing, combined with the process of accident or failure, analyze the cause of the fault, and determine whether the equipment has quality defects or faults.

4. Literature review: Collect the design drawings, manufacturing records, installation records, and instructions of the equipment, and check whether the equipment is designed, manufactured, installed and used in accordance with the requirements of the specifications.

5. Expert consultation: hire experts in related fields to consult and demonstrate the quality of equipment quality, accidents or failures, and provide professional opinions.

IV. Contents of Litigation Appraisal Report

The litigation appraisal report should include the following main contents:

Purpose and basis of identification

Identification methods and processes

On-site inspection and equipment testing

Failure analysis and identification conclusions

Is there any quality defect or failure in the equipment?

Whether the accident or failure is directly related to equipment quality defects or failures

Expert opinions and suggestions

5. Conclusion and industry impact of litigation appraisal

The conclusion of litigation appraisal is essential for the judgment of the case. If the appraisal conclusions prove that the equipment has quality defects or faults, it may adversely affect the defendant (equipment manufacturer or supplier). On the contrary, if the appraisal conclusion proves that the equipment does not have quality defects or faults, or its quality defects have nothing to do with accidents or failures, it may not affect the plaintiff (accident victim or responsible party).

In terms of industry influence, litigation appraisal is of great significance to the development of the electrical industry. By identifying the real causes of accidents or faults, the design, manufacturing and use standards of centralized control protection equipment can be improved, and the reliability and safety of the electrical system can be improved.

6. Expand your knowledge

Main types of centralized control and protection equipment and their application areas

Common centralized control and protection equipment failures and their preventive measures

Prevention and emergency response of electrical accidents or failures

VII. Quality Appraisal Agency