ELECTRIC, WITH AN EDGE
It is connected with various high-voltage electrical equipment, mainly responsible for receiving or distributing electric energy, reflecting the connection mode, interaction and loop relationship between various high-voltage equipment, and it is an important electrical part of 110kv substation.
The performance of the main wiring has a direct impact on the flexibility and reliability of the operation of the substation, and determines the selection of control methods and automatic devices in the power transmission and transformation process, as well as the arrangement of relay protection and power distribution devices.
Therefore, when choosing the main wiring of the 110kv substation, in addition to its own power supply reliability, economy and quality issues, it is also necessary to pay attention to factors such as the expansion and operation of the substation.
What are the main neutral grounding methods of power systems?
The 10kV power distribution device mainly has two layout forms: outdoor and indoor. The exterior layout can be divided into exterior high layout, exterior half height layout and exterior medium layout.
The high-type layout is more suitable for double bus bars, and the layout form is to overlap the bus bar and the bus bar isolation switch up and down.
The half-height arrangement is to raise the bus bar and the bus bar isolation switch, and directly arrange current transformers and circuit breakers and other equipment under the raised bus bar to reduce the span size of the power distribution device. Larger horizontal area.
Therefore, this arrangement is mostly used in substations with many incoming and outgoing circuits.
The outdoor medium-sized layout is to install all equipment and electrical appliances on the ground equipment support, but there is no equipment layout under the busbar. This method is clear, reliable, not easy to misoperation, low cost, low frame height, and convenient construction and maintenance.
The main wiring of the substation should have the following electrical equipment: main transformer, circuit breaker, bus bar, isolating switch, relay protection device, voltage transformer, current transformer, span, lightning arrester, etc.
When designing and selecting the electrical main wiring of 110kV substations, the intermediate substations and terminal substations are the main considerations.
The terminal substation is close to the load center. The 110kV incoming line is usually two-way incoming line, and two main transformers are used to distribute power to low-voltage users;
On the basis of ensuring reliable power supply, the main wiring of the substation shall minimize the area occupied to meet the requirements of simplification, automation, standardization and unmanned.
The selection and design of the main wiring should be determined according to many factors such as the characteristics of electrical equipment, the nature of the load, and the strength of the superior power grid.
Terminal substation wiring forms usually include transformer group wiring, internal bridge wiring, and external bridge wiring.
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