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Improved method for selecting high-voltage circuit breaker in power transformation and distribution system

A technology for high-voltage circuit breakers and power distribution systems, which is applied to circuit breaker testing, instruments, and electrical measurement. It can solve the problems of traditional calculation methods, such as complicated calculation process and no clear quantitative calculation method, so that the calculation process is simple and clear. , high accuracy and accurate calculation results

Active Publication Date: 2017-12-22
鞍钢集团工程技术有限公司
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Problems solved by technology

[0034] The calculation process of the traditional calculation method is complicated, and the time constant T in the system is a The determination of a value does not give a clear quantitative calculation method, but the estimation method or look-up table method is used, and there is a large error

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  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system
  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system
  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system

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specific Embodiment

[0203] New 2030mm cold rolling production line project, including: one acid rolling-rolling mill combined unit, two continuous annealing units, one electro-galvanizing unit, one hot-dip galvanizing unit, one heavy coil inspection unit, one heavy coil splitting unit, one semi-automatic packaging The unit and corresponding public and auxiliary facilities form an annual production scale of 2.1 million tons.

[0204] Build a 110 / 10kV general step-down substation, five 10kV main power rooms, namely: 110 / 10kV cold rolling total step-down substation, continuous rolling main power room, pickling main power room, 1# continuous annealing line main Electrical room, main electrical room of 2# continuous withdrawal line and main electrical room of net ring pumping station.

[0205] The voltage level of the main step-down substation is 110 / 10kV, and there are three 63MVA main transformers. The 110kV side is a line transformer group and the 10kV side is a single-bus section.

[0206] The shor...

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Abstract

The invention provides an improved method for selecting a high-voltage circuit breaker in a power transformation and distribution system, which summarizes a relationship between a periodic component and a direct current component of breaking short-circuit current and improves a calculation formula for the breaking capacity of the circuit breaker. Different from the traditional calculation method, the improved method respectively calculates the periodic component and the direct current component of the short-circuit current and then compares with breaking current of the circuit breaker so as to judge whether the breaking current of the circuit breaker can meet requirements or not. The time-periodic component relationship which is relatively simple and easy to search and calculate is found out by using a relational expression, a value range of a time constant in a power distribution system is deduced, and a calculation method is provided; and the breaking capacity of the circuit breaker is determined through comparing the breaking time. The improved method is simple and clear in calculation process, the original calculation data is easy to obtain, and the calculation result is accurate. Electrical equipment with a high performance-cost ratio can be accurately selected because the accuracy is substantially improved.

Description

technical field [0001] The invention relates to the technical field of medium and high voltage power distribution, in particular to an improved method for selecting a high voltage circuit breaker in a power transformation and distribution system. Background technique [0002] The selection of distribution circuit breakers, the breaking capacity of short-circuit current is one of the most important technical indicators. At present, the main selection methods are as follows: [0003] 1. The selection method given in the "Handbook of Electric Power Design for Iron and Steel Enterprises" is as follows: [0004] The circuit breaker of the power distribution system should be selected according to the breaking capacity to meet the requirements of the following formula: [0005] S dn ≥S" or I dn ≥I" [0006] In the formula, S dn ―The rated breaking capacity of the equipment, MVA; [0007] S"—short-circuit capacity at the fault location, MVA; [0008] I dn ―Rated breaking cu...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3274
Inventor 郑伟李鹏巴月娥许伟宋刚季维鸿高贵军郑诗源富钢滕站
Owner 鞍钢集团工程技术有限公司
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