Analysis of Related Issues of 110kV Substation
In the context of the continuous development of our national economy, and at the same time, we have also promoted the sustainable development of the power industry to a large extent. The construction scale of 110kV substations is also expanding year by year. In the course of its construction, due to the 110kV The quality control of the substation design and construction is not enough. Eventually, 110kV substations often cause many problems in the process of operation, including transformer faults, primary and secondary loop faults, and power cabinet failures.
2. Analysis of ways to improve the construction quality of 110kV substations
2.1 Substation Location Selection
Because the 110kV substation has special electromagnetic fields and is dangerous, it is very important for site selection during substation survey and design. First, the site should be close to the load center; secondly, it should be coordinated with urban and rural development and local planning to facilitate the introduction and derivation of overhead lines and cable lines; third, the site environment should be better, and there should be no flammable or explosive atmosphere around. Hazardous chemicals; Fourth, with appropriate geological, topographic and meteorological conditions; Fifth, to save land while fully considering the future development of substations. In order to fully ensure that 110kV substation will not be affected by various factors outside.
2.2 Transformer main transformer
When the main transformer capacity of the substation is selected, the power system planning within 20 years is taken into consideration, so that changes in the late user load can be satisfied. In addition, under the requirements of the capacity of the station transformer, the main transformer capacity of the 110 kV substation should meet the requirements of commonly used loads. Try to avoid overloading the main transformer due to the temporary load, and it is also possible It guarantees the normal operation of substations in the event of an accident or overload. Under normal circumstances, 110 kV substations use two or more main transformers in parallel operation. When a single transformer operates alone and an accident or power outage occurs, either transformer can be used to allow another transformer to be disconnected. Still maintain normal work.
2.3 Substation wiring
The windings of the main transformer in the 110 kV substation in China at this stage are generally connected using the Y0 method, which can well reach more than 15% of the capacity of the windings on the two sides of the main transformer in the 110 kV substation. Makes the substation's voltage tends to stabilize, reducing voltage fluctuations. In the substation, the main wiring modes can be divided into bus busbars and busbar busbars, which can be selected according to the different substations' own environment and various needs. If a 110 kV substation is a single main transformer, the wiring lines that can be used are 110 The transformers of the kV substation are connected so that one return line and one return line are connected to the main transformer of the 110 kV substation, or a single bus line is used to connect all the lead lines and power lines to the same bus; or It is possible to divide a bus into multiple parts, and then connect different power or lead wires to different busbars. The advantage of doing so is that if one of the wires fails, the other wires can work normally. Fully guarantee the normal operation of the substation.
However, for the two main transformers, the 110 kV substation generally uses a bridge wiring method to connect the two transformer busbars.
2.4 Substation Protection Measures
In the protection of 110 kV substations, the most important is for the daily maintenance operators to carry out operations, such as the protection of the power supply system in the event of failure, as well as the maintenance and restoration of the core components, to strengthen the lightning disaster. In the case of protection, each component in the substation is protected. In the application of substations, the main role of the relay is to protect the equipment, power supply system faults and restore or alarm work. Under normal circumstances, the main transformer can be protected by means of differential protection. This protection method can solve the current difference of the main transformer to a certain extent, and timely disconnect the transformer. Therefore, the current differential situation in the main transformer can be effectively solved, and 110 kV substation can also play a very good role in maintenance, to ensure its normal operation, so as to achieve the purpose of backup protection of the transformer.
3 Conclusion
In short, with the continuous development of society, the electricity consumption of industrial agriculture in China has been increasing so much that the load pressure on the grid has continuously increased. Therefore, it is very important to guarantee the quality of power grid construction. The quality of substation construction is directly related to whether it can operate normally at the later stage and whether it can provide safe and reliable electricity for people's production and life. How to improve the construction quality of 110 kV power grid is of great significance.
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