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Extra-high voltage transformer substation primary system design method

A design method and substation technology, applied in the power grid field, can solve problems such as large power supply radius, low voltage, and unstable power supply

Inactive Publication Date: 2021-04-20
株洲市智汇知识产权运营服务有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the existing UHV primary system, the power supply radius is too large, and the problem of low voltage is prone to occur
Provide a 110KV substation primary system design method to solve the problem of unstable power supply in daily power supply, too large power supply radius, and prone to low voltage

Method used

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  • Extra-high voltage transformer substation primary system design method
  • Extra-high voltage transformer substation primary system design method
  • Extra-high voltage transformer substation primary system design method

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Embodiment Construction

[0035] The present invention will be further described below in combination with specific embodiments.

[0036] 110KV substation primary system design method: including the following steps

[0037] S1. Calculate the system load and select the main transformer;

[0038] Calculate the electricity load for the year:

[0039]

[0040]

[0041] in:

[0042] S c ——Load calculation of substation design year

[0043] K t ——The simultaneous coefficient is 0.85

[0044] X%——The line loss rate is 10%

[0045] S' c = S c e m×n％

[0046] m——The planning period is 10 years

[0047] n——Annual load growth rate of 5%

[0048] S' c =16689.75×e 10×5％ =27516.7(KV·A)

[0049] The rated capacity of the main transformer is 2500KV·A.

[0050] S2. Select the wiring form, as shown in question 1; the selected wiring form is high-voltage side: single-bus connection; medium-voltage side: single-bus connection; low-voltage side: single-bus connection. The main wiring of this scheme i...

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Abstract

A transformer substation is an important component of an electric power system, directly affects safe and economic operation of the whole electric power system, and is a place for converting voltage and current, receiving electric energy and distributing electric energy in the electric power system. The invention provides a 110KV transformer substation primary system design method. The method comprises the following steps: calculating a system load, and selecting a main transformer; selecting a wiring form; calculating short-circuit current; selecting 110KV electrical equipment; configuring and setting relay protection; and designing lightning protection. The problems that power supply in a power supply area is unstable, the power supply radius is too large, and low voltage is prone to occurring are solved, on the premise that safety and reliability are guaranteed, proper electrical equipment is selected, a new technology is adopted, and the investment is saved.

Description

technical field [0001] The invention relates to the field of power grids, and more specifically, to a design method for a primary system of a high-voltage substation. Background technique [0002] A substation is a place in a power system that transforms voltage and current, receives electric energy and distributes electric energy. The substation in the power plant is a step-up substation, whose function is to boost the electric energy generated by the generator and feed it to the high-voltage grid. [0003] Class I substation: Refers to AC UHV substations, nuclear power, large energy bases (3 million kw and above) outbound and cross-regional (North China, Central China, East China, Northeast, Northwest) liaison 750 / 500 / 330kV substations. Class II substations: Refers to substations other than Class I substations, 750 / 500 / 330kV substations, power plant external transmission substations (1 million kW and above, 3 million kW or less) and cross-provincial contact 220kV substati...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02H7/26H02H9/04
Inventor 张铨豪
Owner 株洲市智汇知识产权运营服务有限责任公司
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