CN201156648Y - Mother connection switch circuit of 10KV main connecting wire for alumina plant - Google Patents

Abstract

The utility model discloses a bus connection switch circuit of 10KV main connection of an alumina factory, and includes a bus of section I (1), a bus of section II(2), wherein, a 1# power service wire (6) is connected with the bus of section I (1); a 2# power service wire (7) is connected with the bus of section II (2); a large capacity fast switch (4) and a bus connection breaker (5) are connected in series between the bus of section I (1) and the bus of section II (2), between the bus of section II (2) and the bus of section III (3) as well as between the bus of section I (1) and the bus of section III(3). The bus connection switch circuit of 10KV main connection of an alumina factory reduces the capacity of each switch of a power distribution system, improves the reliability of power supply and saves the investment.

Description

Alumina producer 10KV always joins the bus connection switch circuit of main electrical scheme

Technical field

The utility model relates to a kind of alumina producer and always joins main electrical scheme bus connection switch circuit.

Always joining the female connection of double-bus segmentation loop utilizes the vacuum short-circuiting device to connect with big capacity high-speed switch then to join block switch as mother and belongs to 10KV high pressure power supply-distribution system primary circuit part.

Background technology

The total distribution system of alumina producer 10KV often adopts double bus scheme, I section bus connects 1# main transformer and generator, II section bus connects 2# main transformer and generator, and as I, II section bus paired running during in 10KV bus or outlet short circuit, short circuit current provides the short circuit current summation for system power supply and generator.This will make this distribution system switch capacity improve 2 times of ability and guarantee 10KV system property safe and reliable to operation, and such result increases investment greatly.

Summary of the invention

The technical problems to be solved in the utility model is: provide a kind of new alumina producer 10KV always to join the bus connection switch circuit of main electrical scheme, to overcome the deficiency that the distribution system switch capacity is big, investment is big that prior art exists.

The utility model is taked following technical scheme: with big capacity high-speed switch be used for alumina producer 10KV after bus is connected and always join double-bus configuration system I, II, II, III, between I, the III bus as bus connection switch.Normally cut-offfing by the vacuum short-circuiting device of this switching circuit carried out, and by big capacity high-speed switch cutting-off of short-circuit electric current, reduced the capacity of each switch of distribution system during short circuit, improved the reliability of power supply, saved investment.

Therefore, the utility model compared with prior art, its beneficial effect is: reduced the capacity of each switch of distribution system, improved the reliability of power supply, saved investment.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

Embodiment of the present utility model: as shown in Figure 1, the utility model comprises I section bus 1, II section bus 2,1# power lead-ining line 6 is connected with I section bus 1,2# power lead-ining line 7 is connected with II section bus 2, connect between I section bus 1 and II section bus 2, II section bus 2 and III section bus 3, I section bus 1 and III section bus 3 big capacity high-speed switch 4 and bus 5.Become in the distribution engineering design at Yangquan aluminium oxide, the short circuit current sum that calculate 1,2# system power supply and 3 generators provides is Idmax1=55.09KA, requirement is selected for use and respectively imported and exported the circuit breaker capacity is that 63KA (turnover line totally 23 times) investment increases greatly, behind female connection series connection high-speed switch since its drop-out current up to 160KA, and can within 0.15ms, disconnect female connection, short circuit current is reduced to Idmax2=27.5KA like this, therefore each contact capacity can be reduced to 31.5KA, considers that possible actual the selecting for use of development and dilatation is 40KA.The utility model has been saved investment greatly, has improved the reliability of power supply, and has therefore solved the problem that 10KV system of band self-supply power plant circuit breaker need cut-off the capacity circuit breaker greatly.

Claims (1)

1. an alumina producer 10KV always joins the bus connection switch circuit of main electrical scheme, it comprises I section bus (1), II section bus (2), it is characterized in that: 1# power lead-ining line (6) is connected with I section bus (1), 2# power lead-ining line (7) is connected with II section bus (2), connect between I section bus (1) and II section bus (2), II section bus (2) and III section bus (3), I section bus (1) and III section bus (3) big capacity high-speed switch (4) and bus (5).

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