Next, we will explain the commissioning and qualification requirements for basic power engineering projects.

　　How is the commissioning of power infrastructure projects carried out?

　　After the completion of the electrical infrastructure works, inspection and adjustment are necessary to ensure the proper operation of the entire distribution system. So, what should be paid attention to during the commissioning of electrical installation projects? Next, I will outline the key considerations for commissioning electrical infrastructure works—let’s take a look.

　　I. Adjustment of the Base Engineering Busbar

　　After busbar installation, inspect for any damage, examine the coating and temperature-sensitive indicators for discoloration, and determine whether the busbar joints are overheating. Regularly clean the busbars and insulators, inspect fasteners and joints, and replace rusted bolts and other components.

　　II. Cable Commissioning

　　Each spring and autumn, inspect the heads of indoor and outdoor cable terminations, remove dust and dirt, and check the sleeves for damage and the connectors for signs of overheating.

　　III. Commissioning of the Foundation Engineering Transformer

　　The adjustment of power transformers in basic engineering is primarily carried out by using relevant equipment to test the transformer, such as measuring the DC resistance of the windings, verifying the tap ratio, and performing a power-frequency withstand voltage test on the winding insulation. By analyzing the measured data, it is determined whether the transformer is operating normally.

　　IV. Commissioning of Circuit Breakers

　　The adjustment of circuit breakers primarily involves adjusting the opening and closing operations, followed by measuring the insulation resistance of the insulating rod, the DC resistance and insulation resistance during opening and closing, as well as the DC resistance of each phase. Additionally, the circuit breaker’s opening and closing times and its power-frequency withstand voltage are measured.

　　V. Adjustment of Isolating Switches for Foundation Works

　　When adjusting the isolating switch, slowly separate the cut slots while observing whether the installation position has shifted. At the same time, ensure that the cut slots do not extend into the contact area or strike the end of the insulator.

　　What qualifications are required for the installation of electrical infrastructure projects?

　　Electrical installation projects encompass engineering fields such as thermal power, hydropower, and nuclear power. Quality assurance in power installation covers wind power generation and other energy projects, as well as transmission, distribution, and end-use electricity systems. The selection of electrical installation structures involves considerations specific to power systems and their automation. Accordingly, what qualifications must enterprises engaged in power installation engineering obtain?

　　1. Qualification for Power Engineering Construction and Transmission & Transformation Contracting

　　According to the qualification levels for general contracting in power engineering, contractors are authorized to undertake power generation projects and transmission and transformation projects of various voltage levels, as well as substation construction projects at the same voltage level. Furthermore, such qualifications enable contractors to carry out transmission line and substation projects across different voltage levels. Therefore, when verifying the qualifications of a power installation engineering company, it is essential to clearly understand the specific scope and classification of its general contracting qualifications.

　　2. Nuclear Engineering Professional Contracting Qualification

　　High-level power-related qualifications enable one to hold “key positions,” which refer to roles that entail responsibilities such as operating nuclear reactors, conducting radiochemical engineering, manufacturing nuclear fuel components, performing nuclear isotope separation, engaging in uranium metallurgy, managing nuclear waste disposal, carrying out inspection and maintenance of nuclear power plants, and undertaking uranium mining projects. In the context of power installation projects, such qualifications are both a critical requirement and a challenging one to attain.

　　3. Contracting qualifications for the installation of construction machinery and electrical facilities in foundation engineering

　　Power installation companies with Level 2 or higher qualifications are authorized to undertake relevant substation projects. In addition, such companies must possess the capability to install, maintain, and test power facilities across different voltage levels. Please note that this pertains solely to the licensing requirements for renovation and testing activities related to power equipment, including transformer installation, capacitor installation, installation of insulation and dust-proof equipment, as well as the installation, repair, and testing of transmission and transformation lines.