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High-capacity intelligent high-speed switch

A fast-switching, large-capacity technology, applied in the field of power high-voltage switches, can solve the problems of long time required for fault removal, shortened equipment life, slow current rise, etc., and achieves the effect of convenient industrial realization, simple structure and reduced harm.

Active Publication Date: 2015-04-15
DALIAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The existing detection device mainly detects the amplitude of the short-circuit current. Due to the non-periodic component of rapid decay in the short-circuit current and the influence of various factors such as the magnetic saturation of the transformer in the detection link, only when the short-circuit current is much greater than the rated value In order to accurately judge the short-circuit fault; and due to the influence of the line impedance and the initial state of the short-circuit, the current rise rate at the initial stage of the short-circuit fault is relatively slow, and it takes a long time to judge the threshold; in addition, the opening of the existing circuit breaker operating mechanism Time up to 60~200 ms , resulting in a long time for fault removal, long-term short-circuit current will cause serious damage to the system, so as to shorten the service life of the equipment in the system

Method used

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Embodiment Construction

[0016] Such as figure 1 As shown: the present invention is the same as the prior art, the three-phase power line is connected to the load through switches such as circuit breakers, and a current transformer is connected to the output line of the three-phase power supply, and the switches such as the circuit breaker are driven by a fast operating mechanism, which can be quickly The operating mechanism is controlled by the central processing unit. The difference from the prior art is that the output of the transformer is connected to the three-phase current sampling signal processing circuit, and the three-phase current sampling signal processing circuit is connected to the central processing unit. The three-phase current sampling signal processing circuit is connected to the central processing unit. The current sampling signal processing circuit processes the signal obtained at each sampling point and sends it to the central processing unit for the significance test of the regr...

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Abstract

The invention discloses a high-capacity intelligent high-speed switch which is capable of rapidly disjointing a circuit when a short circuit failure happens. The high-capacity intelligent high-speed switch comprises a current transformer, a rapid operating mechanism and a central processing unit which controls the rapid operating mechanism. An output circuit of the current transformer is connected with a three-phase current sampling signal processing circuit. The three-phase current sampling signal processing circuit is connected with the central processing unit. The three-phase current sampling signal processing circuit processes an obtained signal of a sampling site and sends the signal to the central processing circuit to conduct significance test of a regression equation. When a test result is lower than a set value for successive two times, the central processing unit outputs a brake separating signal to the rapid operating mechanism.

Description

technical field [0001] The invention belongs to the field of electric high-voltage switches, and in particular relates to a large-capacity intelligent fast switch capable of quickly breaking a circuit when a short-circuit fault occurs. Background technique [0002] Short-circuit fault is one of the most serious working conditions in the power system. When a short-circuit fault occurs in the power system, the short circuit needs to break the circuit immediately to protect other equipment connected to the system. Currently, circuit breakers are set up that need to break the circuit immediately to protect other equipment connected to the system. At present, some circuit breakers are equipped with an electromagnetic repulsion mechanism or a permanent magnet mechanism as the drive device. When the detection device detects a short-circuit fault, it outputs a control signal to the operating mechanism, so that the static repulsion coil and the dynamic repulsion of the electromagneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08
Inventor 段雄英董恩源邹积岩廖敏夫黄智慧王永兴
Owner DALIAN UNIV OF TECH
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