SU838882A1 - High-voltage distributing device - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to electrical switchgears of high voltage of 110 kV and above, both open and closed.

Switchgear devices are known that contain power switches and are designed for high-power junction electrical substations and stations with the number of connecting elements more or less (the circuit diagram is the transformer, one and a half circuit, the circuit 1.33) 1.

These switchgear circuits are reasonably reliable, but require a large number of expensive power switches for their implementation.

It is also known a device in which in order to reduce the cost of a substation by reducing the cost of switching equipment without reducing the reliability of operation, it is advisable to build a transformer-bus circuit with one and a half connecting lines 2.

However, this technical solution is used only for two-transformer substations and is completely unacceptable.

for connecting the generators, a transformer is a transformer at powerful power stations, since disconnecting a block in such a scheme produces three or more switches, which is prohibited by standards and leads to a decrease in reliability, besides, there are always more than two blocks at power plants.

The emergence in foreign practice of a much cheaper and reliable switching apparatus (load switch) has led to more economical and

reliable combination circuits of high voltage switchgear, in which load switches are used along with power switches.

The closest technical solution to the invention is a high voltage switchgear for high-power power stations and hub substations, including two bus systems connected

Claims (3)

between each other, chains made up of power switches and a load switch, and connections in the form of power lines and transformers or generator-transformer blocks 3. The disadvantages of this device circuit are its relative high cost and low reliability. The purpose of the invention is to increase reliability and efficiency. The goal is achieved by the fact that in a high voltage switchgear for powerful power plants and node substations, there are two bus systems interconnected by chains from a series-connected power switch and a load switch, connected in the form of transmission lines, transformers or blocks connected to the specified chains generator - transformer connected to the bus; bus systems are partitioned by additional load switches connected between the connection points There is no need for chains to women; at the same time, one transformer or a generator-transformer block is connected to each sectioned busbar section. The drawing shows a diagram of the proposed device. The device consists of power lines 1–8, which, through power switches 9 16, are connected to bus systems 17 and 18 respectively. The systems 17 and 18 are partitioned by switches 19 to 24 loads into eight independent sections with transformers or generator units connected to them. transformer 25–32. In this case, each pair of lines is interconnected by load switches 33-36. The device works as follows. During a short circuit at point 37 on line 1, the load switch 33 is first disconnected, which is permissible because it is shunted by chains formed by circuit elements 11-34-12, 13-35-14, 15-36-16, after which the short circuit current is turned off by the power switch 9. In case of successful reclosing of the power switch 9, the load switch 33 closes the chain 9-33-10. If necessary, the implementation of single-phase reclosing of the power transmission line 1 is also performed by the power switch 9. During a short circuit at point 38 in the transformer or generator unit, the transformer 25 first turns off the load switch 19, which is acceptable because the short circuit current is redistributed through the bus system 18 and the chain 9-33-10, after which it is interrupted by the power switch 9. In the case of a short circuit at point 39, the load switches 22 and 24 are first disconnected, which is permissible, since the short circuit current is redistributed through the bus system 17 and the chain 13-35-14, after which it is interrupted by the power switch 14. Thus, the short-circuit current is turned off for any damage by only one power switch, and in all known circuits the short-circuit current is turned off by two power switches. The drawing shows a diagram of the proposed switchgear for four chains, however the number of chains is not limited, starting with three. The proposed switchgear scheme already with eight connections is more economical than the known device by at least 69%. With an increase in the number of connections, the efficiency increases (with 12 connections, the scheme is 73% more economical). If in a known device, after disconnecting two power switches in a chain, the load break switch is disconnected and then the switch of the intact connection is turned on, then in the circuit of the proposed high voltage switchgear, only one power switch in the damaged chain is disconnected. With a decrease in the number of operations, the possible number of failures decreases, and consequently, the reliability of the proposed switchgear increases. Claims of the invention High voltage switchgear for high-powered power stations and node substations containing two systems of wiring, interconnected by chains from a series-connected power switch and a load switch, connected in the form of power lines, transformers or transformer-generator units connected to for women, characterized in that, in order to increase reliability, bus systems are partitioned by additional load switches, connected between the points of connection of the chains to the tires, with one transformer or a generator-transformer block connected to each partitioned tire section. Sources of information taken into account during the examination 1. M. Lisovsky, S. E. Kheifits. Main circuits and electrical equipment of 35-750 kV substations. M., “Energie, 1977, p. 55, fig. 2 - 7. 2. In the same place 323. 3. In the same place 371. O (g) (D) (g) VI, / -1