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Directional current based shutting method of high-speed switching device of industrial enterprise power supply,

A fast switching and current technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve problems such as interference in industrial enterprises, inability to lead out protection action contacts, and no protection, and achieve the effect of avoiding the expansion of accidents.

Active Publication Date: 2010-05-26
JIANGSU WISCOM TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the particularity of industrial enterprises, there may be no protection here, or the protection action contact cannot be drawn out, and industrial enterprises have serious interference, and there are certain hidden dangers in relying solely on external contact locking

Method used

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  • Directional current based shutting method of high-speed switching device of industrial enterprise power supply,
  • Directional current based shutting method of high-speed switching device of industrial enterprise power supply,
  • Directional current based shutting method of high-speed switching device of industrial enterprise power supply,

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Embodiment Construction

[0020] The invention integrates the directional current criterion, the negative sequence voltage criterion and the low voltage criterion into the fast switching device of the power supply to form a locking logic; during normal operation, the current amplitude at the incoming line switch is less than the rated value, and the direction flows to the working bus, and the working The busbar voltage amplitude is between 95% and 105%, and the phase sequence is positive sequence. When an asymmetric fault or a symmetrical fault occurs on the working bus and its equipment, the current amplitude increases, and the direction flows to the working bus, and a large negative sequence voltage or low voltage appears on the bus.

[0021] The current amplitude increase and direction flow to the working bus are taken as the main criterion for external power failure detection.

[0022] The bus negative sequence voltage and low voltage criteria are used as the means to prevent misjudgment.

[0023]...

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Abstract

The invention relates to a directional current based shutting method of a high-speed switching device of an industrial enterprise power supply, which is characterized in that a current amplitude is increased when a working bus and equipment of the working bus generate unsymmetrical faults or symmetrical fault symmetrical faults so as to obtain a fault current identification criterion, a criterion of directional current of a busbar incoming switch, which flows to the working bus, and a criterion of the working bus generating high negative sequence voltage or low working bus voltage; and a shutting logic is formed by identifying whether the faults are generated on the working bus and the load of the working bus. The invention forms the effective and reliable shutting method by optimally combining relative independent data and puts an emphasis on identifying the faults generated on the working bus positioned at the lower switching side of the industrial enterprise power supply and the loading equipment; in addition, under the fault condition, if the switching of the industrial enterprise power supply is falsely operated, a standby power supply can be arranged in the faults to aggravate accidents, thus the shutting method can effectively shut the switching under the condition of the faults through reasonably arrangement and ensure the safety.

Description

technical field [0001] The invention relates to a new locking method for a power supply fast switching device of an industrial enterprise, which is mainly applicable to the power switching device of medium and high voltage substations of industrial enterprises such as petrochemical, iron and steel, metallurgy, coal, etc. In case of failure, the power switching device is effectively blocked to avoid switching the backup power supply to the failure. Background technique [0002] Industrial enterprise substations generally adopt a dual power supply mode to improve power supply reliability. According to different operation modes, backup power is divided into hot backup and cold backup. When the working power supply has various abnormalities or failures that affect the normal operation of the production load, the backup power supply must be put into operation quickly to ensure the normal production. At present, the standby automatic switching device is usually used to switch be...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCY02B70/30Y04S20/20
Inventor 李杰宗洪良苗世华
Owner JIANGSU WISCOM TECHNOLOGY CO LTD
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