Construction of a New 110kV Transformer Substation

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The construction of a new 110kV transformer substation is a complex and rigorous project. The following are the relevant key points:

### Preliminary Preparation
- **Project Initiation**: Submit a project proposal, including the necessity of construction, scale, site selection, etc., and obtain approval from relevant departments such as the National Development and Reform Commission.
- **Planning and Site Selection**: It should be close to the load center, save land, be coordinated with the urban and rural or industrial and mining enterprise planning, have convenient transportation, have no obvious pollution in the surrounding environment, and have suitable geological, topographical and geomorphological conditions. The elevation of the substation site should be above the high water level that occurs once in 50 years.
- **Feasibility Study**: Conduct in-depth analysis and demonstration on the technical scheme, equipment selection, project investment, economic benefits, etc.
- **Design Bidding**: Select qualified design units to carry out preliminary design and construction drawing design.

### Engineering Construction
- **Civil Construction**: It includes the construction of the foundations of substation buildings, structural support foundations, cable trenches, grounding grids, etc. Strictly follow the design and specification requirements to ensure the stability of the foundations and the reliability of the grounding.
- **Equipment Installation**: For the installation of the main transformer, determine the arrival time in advance, make preparations for its positioning, check the specifications, models and technical parameters, and inspect the enclosure, porcelain parts, etc. Before the installation of GIS equipment, clean the site, do a good job in dust prevention, and optimize the allocation of construction personnel. For the installation of high-voltage switchgear, find the reference panel, fix the switchgear properly, and connect the busbars and secondary wiring.
- **Electrical Connection**: Ensure good contact and firm connection for the connection of busbars, cables, etc., and carry out busbar lap joints, cable laying and wiring according to the specification requirements.

### Equipment Commissioning
- **Individual Commissioning**: Conduct routine and special tests on electrical equipment such as the main transformer, GIS combined electrical appliances, high-voltage switchgear, station service transformer, capacitor and reactor banks.
- **Subsystem Commissioning**: Carry out commissioning for switches, signal transmission, etc., and check whether the cooperation and functions among various systems are normal.
- **Integrated Commissioning**: Conduct joint commissioning of protection devices, measurement and control devices, monitoring devices, etc., simulate various faults and operating conditions, and test the overall performance of the substation.
- **Load Test**: After the substation is connected to the power grid, conduct a load test, measure parameters such as voltage, current and power, and check the accuracy of protection, metering and other devices.

### Acceptance and Commissioning
- **Project Acceptance**: After the construction unit passes the self-inspection, submit an acceptance application. The construction unit organizes design, construction, supervision, operation and other units to conduct the acceptance, including aspects such as civil engineering, electrical equipment, and commissioning, and promptly rectify any problems found.
- **Start-up and Commissioning**: After passing the acceptance, formulate a detailed commissioning plan, including operation steps, safety measures, emergency treatment, etc., and carry out switch operations, equipment power transmission, etc. according to the plan to complete the commissioning.