CN112653144A

CN112653144A - 220kV transformer substation

Info

Publication number: CN112653144A
Application number: CN202011533152.XA
Authority: CN
Inventors: 弓国军; 符国晖; 韦波; 蒋晓东; 周亚敏; 李福权; 罗展标; 苏伟平
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-13
Anticipated expiration: 2040-12-22
Also published as: CN112653144B

Abstract

The invention provides a transformer substation which comprises a first double-low-voltage sleeve transformer, a second double-low-voltage sleeve transformer, a third double-low-voltage sleeve transformer and a fourth double-low-voltage sleeve transformer, wherein two low-voltage sleeves of each main transformer are connected to the low-voltage side of the transformer in parallel, 2 loops of low-voltage side of each transformer are output, one section of bus is respectively input, double-bus wiring is formed, and each section of bus is respectively connected with 10 loops of 10kV outgoing lines. According to the invention, by increasing the number of low-voltage outgoing line loops, the power supply capacity of the low-voltage side is improved, the power supply capacity of the 220kV transformer substation is expanded, the 220kV network is contacted and the 110kV network power supply capacity is ensured, and meanwhile, sufficient power supply can be provided for peripheral loads. In addition, by constructing the transformer substation, the number of distribution points of the transformer substations in the central district of the city can be reduced, and the structure and investment planning of a power grid are optimized.

Description

220kV transformer substation

Technical Field

The invention relates to the technical field of transformer substations, in particular to a 220kV transformer substation.

Background

The existing 220kV transformer substation is usually a hub transformer substation, has the functions of connecting a 220kV network and guaranteeing the power supply of a 110kV network, is additionally supplied with 10kV network power, and has the capacity ratio of three voltage class (220kV, 110kV and 10kV) windings of a main transformer of 100:100: 33.3, from which it can also be seen that the substation supplies 10kV with only 1/3 of its capacity. As shown in fig. 1, the scale of a typical substation is that a main transformer 4x240MVA or 4x180MVA, 220kV outgoing lines 6 loops, 110kV outgoing lines 14 loops, and 10kV outgoing lines 30 loops, wherein main transformers #1 to #3 respectively have 10 outgoing lines, and main transformer #4 only has reactive compensation and no outgoing line. 220kV adopts the wiring of two generating lines, and 110kV adopts the wiring of two divisions of two generating lines, and three main transformers adopt the wiring of two divisions of four sections generating lines of single bus, the fourth main transformer unit wiring before 10kV part. Under the existing technical conditions, the limit on-off current of the breaker of the transformer low-voltage side switch cabinet is 4000A, and the rated currents of the transformer low-voltage winding, the low-voltage bushing and the 10kV switch cabinet bus are uniformly set to be 4000A by taking the limit on the limit, so that only 10 return wires are usually connected. Therefore, the current substation has weak power supply capacity.

Disclosure of Invention

The invention aims to provide a 220kV transformer substation to solve the problem of weak power supply capacity in the prior art.

In order to solve the above technical problems, an aspect of the present invention provides a 220kV substation, including a first double-low voltage bushing main transformer, a second double-low voltage bushing main transformer, a third double-low voltage bushing main transformer, and a fourth double-low voltage bushing main transformer, wherein two double-low voltage bushings of the first double-low voltage main transformer are connected in parallel on the 10kV side of the first double-low voltage bushing main transformer, two double-low voltage bushings of the second double-low voltage main transformer are connected in parallel on the 10kV side of the second double-low voltage bushing main transformer, two double-low voltage bushings of the third double-low voltage main transformer are connected in parallel on the 10kV side of the third double-low voltage bushing main transformer, two double-low voltage bushings of the fourth double-low voltage main transformer are connected in parallel on the 10kV side of the fourth double-low voltage bushing main transformer, the 10kV side of the first double-low voltage bushing main transformer is connected with a first 10kV bus through a first circuit breaker and a line, the 10kV side of the first double-low-voltage sleeve main transformer is also connected with a second 10kV bus through a second circuit breaker and a line, the 10kV side of the second double-low-voltage sleeve main transformer is connected with a third 10kV bus through a third circuit breaker and a line, the 10kV side of the second double-low-voltage sleeve main transformer is also connected with a fourth 10kV bus through a fourth circuit breaker and a line, the 10kV side of the third double-low-voltage sleeve main transformer is connected with a fifth 10kV bus through a fifth circuit breaker and a line, the 10kV side of the third double-low-voltage sleeve main transformer is also connected with a sixth 10kV bus through a sixth circuit breaker and a line, the 10kV side of the fourth double-low-voltage sleeve main transformer is connected with a seventh 10kV bus through a seventh circuit breaker and a line, the 10kV side of the fourth double-low-voltage sleeve main transformer is also connected with an eighth 10kV bus through an eighth circuit breaker and a line, first 10kV generating line passes through ninth circuit breaker and tie line and is connected with third 10kV generating line, third 10kV generating line passes through tenth circuit breaker and tie line and is connected with fifth 10kV generating line, fifth 10kV generating line passes through eleventh circuit breaker and tie line and is connected with seventh 10kV generating line, and second 10kV generating line passes through twelfth circuit breaker and tie line and is connected with fourth 10kV generating line, fourth 10kV generating line passes through thirteenth circuit breaker and tie line and is connected with sixth 10kV generating line, sixth 10kV generating line passes through fourteenth circuit breaker and tie line and is connected with eighth 10kV generating line.

In a specific embodiment, the first 10kV bus is connected to an input terminal of the first 10-return outgoing line cabinet by a feeder, the second 10kV bus is connected to an input terminal of the second 10-return outgoing line cabinet by a feeder, the third 10kV bus is connected to an input terminal of the third 10-return outgoing line cabinet by a feeder, the fourth 10kV bus is connected to an input terminal of the fourth 10-return outgoing line cabinet by a feeder, the fifth 10kV bus is connected to an input terminal of the fifth 10-return outgoing line cabinet by a feeder, the sixth 10kV bus is connected to an input terminal of the sixth 10-return outgoing line cabinet by a feeder, the seventh 10kV bus is connected to an input terminal of the seventh 10-return outgoing line cabinet by a feeder, and the eighth 10kV bus is connected to an input terminal of the eighth 10-return outgoing line cabinet by a feeder.

In one embodiment, the capacity ratios of the first dual low-voltage bushing main transformer, the second dual low-voltage bushing main transformer, the third dual low-voltage bushing main transformer, and the fourth dual low-voltage bushing main transformer are 240: 240: 160 MVA.

In a specific embodiment, the rated current of the low-voltage windings of the first double low-voltage bushing main transformer, the second double low-voltage bushing main transformer, the third double low-voltage bushing main transformer and the fourth double low-voltage bushing main transformer is 8000A, and the rated current of each low-voltage bushing is 4000A.

In a specific embodiment, the first 10kV bus is connected with the first capacitor through a fifteenth circuit breaker and a circuit, the second 10kV bus is connected with the second capacitor through a sixteenth circuit breaker and a circuit, the third 10kV bus is connected with the third capacitor through a seventeenth circuit breaker and a circuit, the fourth 10kV bus is connected with the fourth capacitor through an eighteenth circuit breaker and a circuit, the fifth 10kV bus is connected with the fifth capacitor through a nineteenth circuit breaker and a circuit, the sixth 10kV bus is connected with the sixth capacitor through a twentieth circuit breaker and a circuit, the seventh 10kV bus is connected with the seventh capacitor through a twenty-first circuit breaker and a circuit, and the eighth 10kV bus is connected with the eighth capacitor through a twenty-second circuit breaker and a circuit.

In a specific embodiment, the first double low-voltage bushing main transformer, the second double low-voltage bushing main transformer, the third double low-voltage bushing main transformer and the fourth double low-voltage bushing main transformer are all SFSZ11-240000/220 models.

The embodiment of the invention has the beneficial effects that: the main transformer of the transformer substation adopts double-low-voltage sleeve transformers, two low-voltage sleeves of each main transformer are connected to the low-voltage side of the transformer in parallel, 2 loops of low-voltage side of each transformer are output, one section of bus is respectively input to form double-bus connection, and each section of bus is respectively connected with 10 loops of 10kV outgoing lines. According to the invention, by increasing the number of low-voltage outgoing line loops, the power supply capacity of the low-voltage side is improved, the power supply capacity of the 220kV transformer substation is expanded, the 220kV network is contacted and the 110kV network power supply capacity is ensured, and meanwhile, sufficient power supply can be provided for peripheral loads. In addition, by constructing the transformer substation, the number of distribution points of the transformer substations in the central district of the city can be reduced, and the structure and investment planning of a power grid are optimized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a simple circuit diagram of a prior art substation;

FIG. 2 is a circuit diagram of a substation of an embodiment of the present invention;

fig. 3 is a coupling diagram of a double low-voltage bushing transformer of a substation according to an embodiment of the present invention;

fig. 4 is another connection diagram of a double low-voltage bushing transformer of a substation according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.

Referring to fig. 2, a 220kV substation is provided in an embodiment of the present invention, and includes a first double-low-voltage bushing main transformer #1, a second double-low-voltage bushing main transformer #2, a third double-low-voltage bushing main transformer #3, and a fourth double-low-voltage bushing main transformer #4, where a 10kV side of the first double-low-voltage bushing main transformer #1 is connected to a first 10kV bus 1AM through a first circuit breaker and a line, a 10kV side of the first double-low-voltage bushing main transformer #1 is further connected to a second 10kV bus 1BM through a second circuit breaker and a line, a 10kV side of the second double-low-voltage bushing main transformer #2 is connected to a third 10kV bus 2AM through a third circuit breaker and a line, a 10kV side of the second double-low-voltage bushing main transformer #2 is further connected to a fourth 10kV bus 2BM through a fourth circuit breaker and a line, and a 10kV side of the third double-low-voltage bushing main transformer #3 is connected to a fifth 10kV bus 3AM 3 through a fifth circuit breaker and a The 10kV side of the third double low-voltage bushing main transformer #3 is further connected with a sixth 10kV bus 3BM through a sixth circuit breaker and a line, the 10kV side of the fourth double low-voltage bushing main transformer #4 is connected with a seventh 10kV bus 4AM through a seventh circuit breaker and a line, the 10kV side of the fourth double low-voltage bushing main transformer #4 is further connected with an eighth 10kV bus 4BM through an eighth circuit breaker and a line, the first 10kV bus 1AM is connected with a third 10kV bus 2AM through a ninth circuit breaker and a tie line, the third 10kV bus 2AM is connected with a fifth 10kV bus 3AM through a tenth circuit breaker and a tie line, the fifth 10kV bus 3AM is connected with a seventh 10kV4 kV bus 4AM through an eleventh circuit breaker and a tie line, the second 10kV bus 1BM is connected with a fourth 10kV bus 2BM through a twelfth circuit breaker and a tie line, and the fourth 10kV bus 2BM is connected with the sixth 10kV bus 3BM through a thirteenth circuit breaker and a tie line, and the sixth 10kV bus 3BM is connected with the eighth 10kV bus 4BM through a fourteenth circuit breaker and a tie line.

The double-low-voltage sleeve transformer is a three-winding transformer with a single low-voltage winding and double low-voltage sleeves. The conventional three-winding transformer is provided with a group of high-voltage, medium-voltage and low-voltage windings and a sleeve respectively, so that the connection of the transformer and three different voltages is realized. In a specific embodiment, the double-low-voltage bushing transformer is formed by connecting a group of low-voltage bushings to the low-voltage winding in the conventional three-winding transformer to achieve the effect of shunting, so that the purpose of capacity increase of the low-voltage winding is achieved. Fig. 3 shows a connection diagram of a double low-voltage bushing transformer, wherein 1 is a high-voltage winding connection portion, 2 is a medium-voltage winding connection portion, 3 is a low-voltage winding connection portion, O is a neutral point, A, B, C is a three-phase connection point, Om is a neutral point, Am, Bm, Cm are three-phase connection points, and in the low-voltage winding connection portion, it includes two sets of three-phase connection points, c1, b1, a1, c2, b2, a 2. On the basis of a conventional transformer, a group of low-voltage bushings are connected in parallel, namely a group of low-voltage windings are matched with two groups of low-voltage bushings, so that the rated current of the low-voltage windings is 8000A, the rated current of the low-voltage bushings is 4000A, and other parameters are the same as those of the conventional transformer.

In another embodiment, fig. 4 shows another structural connection diagram of a double low-voltage bushing transformer, which uses a split-winding transformer having one set of high-voltage and medium-voltage windings and two sets of low-voltage windings, and correspondingly having one set of high-voltage winding, medium-voltage winding and two sets of low-voltage windings, and the three-phase ends of the two sets of low-voltage windings are a1, b1, c1 and a2, b2, c 2.

Referring to fig. 2, the first 10kV bus 1AM is connected to an input end of the first 10-return outgoing line cabinet through a feeder, the second 10kV bus 1BM is connected to an input end of the second 10-return outgoing line cabinet through a feeder, the third 10kV bus 2AM is connected to an input end of the third 10-return outgoing line cabinet through a feeder, the fourth 10kV bus 2BM is connected to an input end of the fourth 10-return outgoing line cabinet through a feeder, the fifth 10kV bus 3AM is connected to an input end of the fifth 10-return outgoing line cabinet through a feeder, the sixth 10kV bus 3BM is connected to an input end of the sixth 10-return outgoing line cabinet through a feeder, the seventh 10kV bus 4AM is connected to an input end of the seventh 10-return outgoing line cabinet through a feeder, and the eighth 10kV bus 4BM is connected to an input end of the eighth 10-return outgoing line cabinet through a feeder.

In a specific embodiment, the main transformer of the substation is 4x240MVA or 4x180MVA, and the outgoing line of 220kV is 6 loops, the outgoing line of 110kV is 14 loops, and the outgoing line of 10kV is 80 loops. 220kV adopts two buses or two branch section wiring of two buses, and 110kV adopts two branch section wiring of two buses, and 10kV adopts two bus segmentation wiring. 2 times of low-voltage side of each transformer are output, one section of bus is respectively input, 10 times of 10kV outgoing line is carried by each section of bus to form double-bus wiring, and circuit breakers are adopted for segmenting among 4 main transformer low-voltage side buses, so that double-bus segmented wiring is formed. 4 main transformers total 8 sections of buses, and each section of bus is respectively connected with 10-circuit 10kV outgoing lines, so the 10kV outgoing lines total 80 circuits, and the number of the outgoing lines is greatly increased compared with that of 30-circuit outgoing lines of a typical transformer substation.

In one embodiment, the main transformer is of the type SFSZ11-240000/220, and the capacity ratio is 240: 240: 160MVA (100: 100:66.6), rated current of a low-voltage winding 8000A, double low-voltage bushings, rated current of a low-voltage bushing 4000A, and other parameters are the same as those of a conventional transformer.

As shown in fig. 2, the first 10kV bus 1AM is connected to the first capacitor c1 through a fifteenth breaker and line, the second 10kV bus 1BM is connected to the second capacitor c2 through a sixteenth breaker and line, the third 10kV bus 2AM is connected to the third capacitor c3 through a seventeenth breaker and line, the fourth 10kV bus 2BM is connected to the fourth capacitor c4 through an eighteenth breaker and line, the fifth 10kV bus 3AM is connected to the fifth capacitor c5 through a nineteenth breaker and line, the sixth 10kV bus 3BM is connected to the sixth capacitor c6 through a twentieth breaker and line, the seventh 10kV bus 4AM is connected to the seventh capacitor c7 through a twenty-first breaker and line, and the eighth 10kV bus 4BM is connected to the eighth capacitor c8 through a twelfth breaker and line.

As shown in fig. 2, first 10kV bus 1AM is further connected with first PT cabinet PT1, first 10kV bus 1AM is further connected with first PT cabinet PT1, second 10kV bus 1BM is further connected with second PT cabinet PT2, third 10kV bus 2AM is further connected with third PT cabinet PT3, fourth 10kV bus 2BM is further connected with fourth PT cabinet PT4, fifth 10kV bus 3AM is further connected with fifth PT cabinet PT5, sixth 10kV bus 3BM is further connected with sixth PT cabinet PT6, seventh 10kV bus 4AM is further connected with seventh PT cabinet PT7, eighth 10kV bus 4BM is further connected with eighth PT cabinet 8.

As shown in FIG. 2, the first to eighth 10kV buses are also connected with the ground GND1-GND8 correspondingly.

The transformer substation comprises a first double-low-voltage sleeve transformer, a second double-low-voltage sleeve transformer, a third double-low-voltage sleeve transformer and a fourth double-low-voltage sleeve transformer, wherein two low-voltage sleeves of each main transformer are connected to the low-voltage side of the transformer in parallel, 2 loops of low-voltage sleeves of each main transformer are output, a section of bus is respectively input, double-bus wiring is formed, and each section of bus is respectively connected with a 10-loop 10kV outgoing line. According to the embodiment of the invention, by increasing the number of the low-voltage outgoing line loops, the power supply capacity of the low-voltage side is improved, the power supply capacity of the 220kV transformer substation is expanded, the 220kV network is contacted, the power supply capacity of the 110kV network is ensured, and meanwhile, sufficient power supply can be provided for peripheral loads. In addition, by constructing the transformer substation, the number of distribution points of the transformer substations in the central district of the city can be reduced, and the structure and investment planning of a power grid are optimized.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. A220 kV transformer substation is characterized by comprising a first double-low-voltage sleeve main transformer, a second double-low-voltage sleeve main transformer, a third double-low-voltage sleeve main transformer and a fourth double-low-voltage sleeve main transformer, wherein two double low-voltage sleeves of the first double-low-voltage sleeve main transformer are connected to the 10kV side of the first double-low-voltage sleeve main transformer in parallel, two double low-voltage sleeves of the second double-low-voltage sleeve main transformer are connected to the 10kV side of the second double-low-voltage sleeve main transformer in parallel, two double low-voltage sleeves of the third double-low-voltage sleeve main transformer are connected to the 10kV side of the third double-low-voltage sleeve main transformer in parallel, two double low-voltage sleeves of the fourth double-low-voltage sleeve main transformer are connected to the 10kV side of the fourth double-low-voltage sleeve main transformer in parallel, and the 10kV side of the first double-low-voltage sleeve main transformer is connected with a first 10kV bus through, the 10kV side of the first double-low-voltage sleeve main transformer is also connected with a second 10kV bus through a second circuit breaker and a line, the 10kV side of the second double-low-voltage sleeve main transformer is connected with a third 10kV bus through a third circuit breaker and a line, the 10kV side of the second double-low-voltage sleeve main transformer is also connected with a fourth 10kV bus through a fourth circuit breaker and a line, the 10kV side of the third double-low-voltage sleeve main transformer is connected with a fifth 10kV bus through a fifth circuit breaker and a line, the 10kV side of the third double-low-voltage sleeve main transformer is also connected with a sixth 10kV bus through a sixth circuit breaker and a line, the 10kV side of the fourth double-low-voltage sleeve main transformer is connected with a seventh 10kV bus through a seventh circuit breaker and a line, the 10kV side of the fourth double-low-voltage sleeve main transformer is also connected with an eighth 10kV bus through an eighth circuit breaker and a line, first 10kV generating line passes through ninth circuit breaker and tie line and is connected with third 10kV generating line, third 10kV generating line passes through tenth circuit breaker and tie line and is connected with fifth 10kV generating line, fifth 10kV generating line passes through eleventh circuit breaker and tie line and is connected with seventh 10kV generating line, and second 10kV generating line passes through twelfth circuit breaker and tie line and is connected with fourth 10kV generating line, fourth 10kV generating line passes through thirteenth circuit breaker and tie line and is connected with sixth 10kV generating line, sixth 10kV generating line passes through fourteenth circuit breaker and tie line and is connected with eighth 10kV generating line.

2. The substation of claim 1, wherein:

the first 10kV bus is connected with the input end of the first 10-return outlet cabinet through a feeder line, the second 10kV bus is connected with the input end of the second 10-return outlet cabinet through a feeder line, the third 10kV bus is connected with the input end of the third 10-return outlet cabinet through a feeder line, the fourth 10kV bus is connected with the input end of the fourth 10-return outlet cabinet through a feeder line, the fifth 10kV bus is connected with the input end of the fifth 10-return outlet cabinet through a feeder line, the sixth 10kV bus is connected with the input end of the sixth 10-return outlet cabinet through a feeder line, the seventh 10kV bus is connected with the input end of the seventh 10-return outlet cabinet through a feeder line, and the eighth 10kV bus is connected with the input end of the eighth 10-return outlet cabinet through a feeder line.

3. A substation according to claim 2, characterized in that:

the capacity ratios of the first double-low-voltage sleeve main transformer, the second double-low-voltage sleeve main transformer, the third double-low-voltage sleeve main transformer and the fourth double-low-voltage sleeve main transformer are all 240: 240: 160 MVA.

4. A substation according to claim 3, characterized in that:

rated currents of low-voltage windings of the first double-low-voltage sleeve main transformer, the second double-low-voltage sleeve main transformer, the third double-low-voltage sleeve main transformer and the fourth double-low-voltage sleeve main transformer are 8000A, and rated current of each low-voltage sleeve is 4000A.

5. A substation according to claim 4, characterized in that:

first 10kV generating line is connected with first condenser through fifteenth circuit breaker and circuit, second 10kV generating line is connected with the second condenser through sixteenth circuit breaker and circuit, third 10kV generating line is connected with the third condenser through seventeenth circuit breaker and circuit, fourth 10kV generating line is connected with the fourth condenser through eighteenth circuit breaker and circuit, fifth 10kV generating line is connected with the fifth condenser through nineteenth circuit breaker and circuit, sixth 10kV generating line is connected with the sixth condenser through twentieth circuit breaker and circuit, seventh 10kV generating line is connected with the seventh condenser through twenty-first circuit breaker and circuit, eighth 10kV generating line is connected with the eighth condenser through twenty-twelfth circuit breaker and circuit.

6. A substation according to claim 5, characterized in that:

the first double-low-voltage bushing main transformer, the second double-low-voltage bushing main transformer, the third double-low-voltage bushing main transformer and the fourth double-low-voltage bushing main transformer are SFSZ11-240000/220 in model.