CN111313302A - 35kV transformer substation - Google Patents

35kV transformer substation Download PDF

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Publication number
CN111313302A
CN111313302A CN202010242890.2A CN202010242890A CN111313302A CN 111313302 A CN111313302 A CN 111313302A CN 202010242890 A CN202010242890 A CN 202010242890A CN 111313302 A CN111313302 A CN 111313302A
Authority
CN
China
Prior art keywords
transformer
switch
substation according
substation
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010242890.2A
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Chinese (zh)
Inventor
沈灿然
胡兰馨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Dianji University
Original Assignee
Shanghai Dianji University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Dianji University filed Critical Shanghai Dianji University
Priority to CN202010242890.2A priority Critical patent/CN111313302A/en
Publication of CN111313302A publication Critical patent/CN111313302A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B7/00Enclosed substations, e.g. compact substations
    • H02B7/06Distribution substations, e.g. for urban network
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/20Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B5/00Non-enclosed substations; Substations with enclosed and non-enclosed equipment
    • H02B5/01Earthing arrangements, e.g. earthing rods

Abstract

The invention relates to a 35kV transformer substation which comprises a controller, a transformer, a 6kV switch, a 35kV switch and a capacitor, wherein the controller is connected with the transformer, the 6kV switch, the 35kV switch and the capacitor, the 6kV switch and the 35kV switch are connected with the transformer, the capacitor is connected with the 6kV switch, single-bus sectional wiring is adopted on the 6kV side, and internal bridge type wiring is adopted on the 35kV side. Compared with the prior art, the method meets the power utilization requirements of medium and small towns and rural areas with smaller power utilization capacity difference, more power utilization equipment and only one secondary load.

Description

35kV transformer substation
Technical Field
The invention relates to the field of transformer substation design, in particular to a 35kV transformer substation.
Background
In an electric power system, a 35kV transformer substation has the characteristics of convenience in overhaul, maintenance, operation and installation, short construction period, quickness in investment effectiveness, small investment scale and the like, and is suitable for areas with relatively small flow and small electric load. However, the design of the transformer substation is a complex content, such as main wiring design and electrical equipment selection, transformer arrangement design, arrangement design of switch cabinets, house plane and lightning protection grounding design, and the like, how to keep the safe and stable operation of the whole power supply network and meet the power consumption requirements of medium and small towns and rural areas is a problem which is urgently needed to be solved by the current 35kV transformer substation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a 35kV transformer substation.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a 35kV transformer substation, includes controller, transformer, 6kV switch, 35kV switch and condenser are connected to the controller, 6kV switch and 35kV switch connection transformer, 6kV switch is connected to the condenser, and the single bus segmentation wiring is adopted in the 6kV side, and the internal bridge formula wiring is adopted in the 35kV side.
The controller uses a need coefficient method to perform load calculation.
The plurality of capacitors are connected in parallel to the secondary side bus, and the controller performs capacitor switching according to different load conditions.
The transformer is an oil-immersed transformer.
The transformer has two, and each other is for subsequent use.
And the 35kV side adopts an LGJ-185 type steel core aluminum stranded wire.
And an LMY-80.10 type aluminum bus is adopted at the 6kV side.
The transformer adopts a grounding lightning protection net for overvoltage protection.
Compared with the prior art, the invention has the following advantages:
(1) the 6kV side adopts single bus sectional wiring, which has better power supply reliability and flexibility, is convenient for extension and can be used for a plurality of inlet and outlet wires of first and second-level loads; the 35kV side adopts an inner bridge type connection, so that two incoming lines and two incoming lines have stable load, and the power utilization requirements of small power utilization capacity difference, more power utilization equipment and only one or two-level load conditions in medium and small towns and rural areas are met.
(2) Two transformers are selected and used as dark standby transformers, and the requirements of loads on power supply reliability and power supply economy can be met.
(3) The transformer substation is designed in a planar arrangement mode, and the lightning protection and grounding integrated mode is adopted, so that the lightning protection effect is better.
(4) The whole transformer substation is safe, economic and reliable, convenient to overhaul and maintain, convenient to operate and install, short in construction period, quick in investment effect and small in investment scale, and has certain reference significance for further improving the optimal design application level of the electrical system of the transformer substation and the design application level of the electrical system of the transformer substation with higher voltage level.
(5) The oil-immersed transformer has good insulating property and heat conducting property, is low in price and is suitable for transformer substations of enterprises.
Drawings
FIG. 1 is an electrical main wiring diagram of the present invention;
fig. 2 is a plan view of a substation of the present invention;
FIG. 3 is a schematic diagram of a loop-type grounding according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides a 35kV transformer substation, which comprises a controller, a transformer, a 6kV switch, a 35kV switch and a capacitor, wherein the controller is connected with the transformer, the 6kV switch, the 35kV switch and the capacitor, the 6kV switch and the 35kV switch are connected with the transformer, the capacitor is connected with the 6kV switch, a single-bus sectional wiring is adopted on a 6kV side, an internal bridge type wiring is adopted on a 35kV side, and an electric main wiring diagram is shown in figure 1; the 6kV side adopts single-bus sectional wiring, has better power supply reliability and flexibility, is convenient to expand, can be used for a plurality of inlet and outlet wires of first-level and second-level loads, adopts internal bridge type wiring at the 35kV side, enables the loads of two inlet wires and two inlet wires to be more stable, and meets the power consumption requirements of medium and small towns and rural areas with smaller power consumption capacity difference, more power consumption equipment and only first-level and second-level load conditions.
Specifically, the method comprises the following steps:
a plurality of capacitors are connected in parallel with a secondary side bus, the controller switches the capacitors according to different load conditions to complete reactive power compensation, the capacitors are connected in parallel in the steady-state reactive power compensation equipment, and a centralized compensation mode is adopted, so that the instantaneous power factor meets the requirement,
the transformer is an oil-immersed transformer, has good insulating property and heat conducting property and low price, and is suitable for transformer substations of enterprises. The controller uses a required coefficient method for load calculation, and has the advantages of simple and convenient calculation, small error and wide application range. The two transformers are mutually standby, and can meet the requirements of loads on power supply reliability and power supply economy. And an LGJ-185 type steel core aluminum stranded wire is adopted on the 35kV side. And an LMY-80.10 type aluminum bus is adopted at the 6kV side.
The design process of the 35kV substation of this embodiment:
(1) and load calculation and reactive compensation, namely calculating the maximum load of the 35kV transformer substation in operation by using a demand coefficient method, and performing reactive compensation under the condition of insufficient power factor. (2) The main wiring is selected from a single bus section internal bridge wiring, and the transformer is selected from a suitable one in the market. (3) And calculating short-circuit current, namely calculating the short-circuit current on two sides of the transformer. (4) The selection of electrical equipment, the high-voltage side all adopt the form of cubical switchboard, check-up electrical apparatus under according to the short circuit condition during the selection equipment. (5)35kV transformer substation plane layout, economical and practical. (6) The grounding lightning protection mainly adopts a lightning protection net for lightning protection, and the grounding design adopts loop grounding. (7) And (4) designing drawings, including drawings such as an electrical appliance main wiring diagram, a transformer substation plane layout diagram, a lightning protection wiring map and the like.
The planar arrangement is shown in fig. 2, wherein the capacitor chamber is connected to the 6kV switch chamber and the main control chamber, the transformer is an oil-immersed transformer, which has good insulation property and heat conduction property, is suitable for normal environment, and is therefore placed outdoors.
As shown in fig. 3, the grounding type lightning protection network is a horizontal grounding body and a vertical grounding electrode as the grounding mode of the 35kV substation, wherein the horizontal grounding body is mainly used. The station adopts anti-static grounding and protective grounding, and metal components in the main control building are in equipotential connection with the protective grounding of a low-voltage power distribution system in the building. A plurality of grounding bodies are connected into a whole by flat steel to form a grounding grid, and the arrangement mode of the grounding grid is a loop mode. The ground body is driven into the ground in a loop mode around required equipment or building walls, so that the potential distribution is uniform, and the step voltage is reduced. The mode connection mode is reliable and high in safety performance.
The 35kV substation of the present embodiment has the following indicators: the three-phase short-circuit capacity on the 35kV side bus is 900MVA, the three-phase short-circuit capacity on the 6kV side bus is 700MVA, the relay protection time is not more than 2s, and the power factor is 0.9.

Claims (8)

1. The utility model provides a 35kV transformer substation, includes controller, transformer, 6kV switch, 35kV switch and condenser are connected to the controller, 6kV switch and 35kV switch connection transformer, 6kV switch is connected to the condenser, its characterized in that, 6kV side adopts single bus-bar segmentation wiring, and 35kV side adopts interior bridge type wiring.
2. A 35kV substation according to claim 1, wherein the controller uses a demand coefficient method for load calculation.
3. A 35kV substation according to claim 1, wherein a plurality of the capacitors are connected in parallel to the secondary side bus, and the controller performs capacitor switching according to different load conditions.
4. A35 kV substation according to claim 1, characterized in that the transformer is an oil-immersed transformer.
5. A 35kV substation according to claim 1, wherein there are two transformers which are in standby.
6. A 35kV substation according to claim 1, wherein LGJ-185 type steel core aluminum stranded wire is used at the 35kV side.
7. A 35kV substation according to claim 1, characterized in that the 6kV side uses LMY-80.10 type aluminum bus.
8. A 35kV substation according to claim 1, wherein the transformer is overvoltage protected by a grounded lightning protection network.
CN202010242890.2A 2020-03-31 2020-03-31 35kV transformer substation Pending CN111313302A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010242890.2A CN111313302A (en) 2020-03-31 2020-03-31 35kV transformer substation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010242890.2A CN111313302A (en) 2020-03-31 2020-03-31 35kV transformer substation

Publications (1)

Publication Number Publication Date
CN111313302A true CN111313302A (en) 2020-06-19

Family

ID=71151677

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010242890.2A Pending CN111313302A (en) 2020-03-31 2020-03-31 35kV transformer substation

Country Status (1)

Country Link
CN (1) CN111313302A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201877684U (en) * 2010-11-08 2011-06-22 中国水电顾问集团华东勘测设计研究院 Single-busbar sectional wiring structure for isolating switch
CN104505758A (en) * 2014-12-16 2015-04-08 国家电网公司 Configuration method of 110kV outdoor flexible busbar improved half-high distribution device
CN204967265U (en) * 2015-10-16 2016-01-13 国网山东桓台县供电公司 Electric system of transformer substation
CN109149570A (en) * 2018-09-20 2019-01-04 国网江苏省电力有限公司镇江供电分公司 Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201877684U (en) * 2010-11-08 2011-06-22 中国水电顾问集团华东勘测设计研究院 Single-busbar sectional wiring structure for isolating switch
CN104505758A (en) * 2014-12-16 2015-04-08 国家电网公司 Configuration method of 110kV outdoor flexible busbar improved half-high distribution device
CN204967265U (en) * 2015-10-16 2016-01-13 国网山东桓台县供电公司 Electric system of transformer substation
CN109149570A (en) * 2018-09-20 2019-01-04 国网江苏省电力有限公司镇江供电分公司 Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李远: "35kV常规变电站电气二次设计", 《电工技术》 *

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