The difference between single bus section and double bus

Single bus and double bus are two different bus connection methods in the power system. Single-bus connection means that all the power supply incoming and outgoing wires are connected to the same set of buses, which is suitable for small power transformation and distribution stations with fewer outgoing circuits. The advantages of single-bus connection were simple, less equipment, low investment, convenient operation, and easy to expand. However, the disadvantage of single-bus connection is poor reliability and flexibility. Dual bus connection meant that each circuit could be converged to two busbars through a circuit breaker and two sets of isolating switches. The advantage of double bus connection was that the power supply method was more complicated and flexible, suitable for large-scale power distribution equipment. However, the disadvantage of double bus connection was that it required more equipment and investment. In general, single-bus connection is suitable for small power distribution stations, while double-bus connection is suitable for large-scale power distribution devices.

The difference between the first and second bus sections was their functions and uses. The first section of the bus was the bus that was connected to the main transformer after the transmission side cable or cable head of the power station entered the transformer station. It was used to receive high-voltage electric energy from the power station. The second-stage bus was the bus before the intermediate voltage energy output from the main transformer entered the power transmission station. It was used to carry the power transmission in the power transmission station. The connection method of the first section bus and the second section bus was also different. The first section bus divided the bus into two sections, and each section bus was connected to several outgoing lines. The two sections of bus were connected by a bus breaker, which could realize rapid switching and load transfer. In contrast, the two-section bus could connect all the outgoing lines to either the first bus or the second bus. When any bus was cut off, all the outgoing lines could be transferred to the other bus to achieve continuous power supply. In general, there were differences in power transmission and power supply reliability between the first bus and the second bus.

Dual bus connection is the main connection method of power distribution system, which has some advantages and disadvantages. Its advantages included reliable power supply, flexible dispatching, and convenient expansion. The double bus connection could be switched and repaired through the operation of the isolating switch, so that the power supply would not be interrupted. In addition, the dual-bus connection could also properly match the load and power supply to achieve an uninterrupted power supply for important users. However, there were some shortcomings in the dual-bus connection, such as complicated operation, increased investment, and complicated power distribution equipment. In order to solve these problems, bus sections and bypass bus systems could be used. In general, double-bus connection has a certain range of applications and advantages in the power system, but it also needs to weigh its advantages and disadvantages to choose the appropriate connection method.

Single-bus connection was a main electrical connection method, which was composed of a line, a transformer circuit, and a set of buses. Each power line and lead-out line was connected to the same set of buses through a circuit breaker and an isolating switch. The single-bus connection is simple, economical and convenient. It is suitable for the number of outgoing circuits of 6 - 10Kiloton power distribution devices not exceeding 5 circuits, 35 - 63Kiloton power distribution devices not exceeding 3 circuits, and 110 - 220Kiloton power distribution devices not exceeding 2 circuits. The advantages of single-bus connection were less equipment, less investment, convenient operation, and easy expansion. However, the reliability and flexibility of the single-bus connection are poor. When the bus or the bus isolation switch fails or is repaired, all the power supply of the bus must be disconnected. In order to improve the reliability and flexibility of power supply, the improved method of single-bus section connection or single-bus bypass connection can be adopted. The single-bus section connection can reduce the range of influence of bus faults and improve the reliability of power supply.

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