Load variation tracking automatic rated value breaker

A technology of load variation and rated value, applied in low-voltage electrical appliances, creating a high-level field, which can solve problems such as personal equipment accidents, circuit breaker overload protection out-of-control, fire, etc., and achieve the effects of high sensitivity, high safety performance, and high reliability.

Active Publication Date: 2011-06-29
张 世兴
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AI Technical Summary

Problems solved by technology

[0005] The basic principle for people to use circuit breakers is to select the rated value Ir of the circuit breaker according to the expected maximum load current In. However, according to the formula for calculating the safe load current of the circuit breaker, if the load current In is less than 81% of the rated value Ir, the circuit breaker The overload protection will be out of control. If the load current In is less than 67% of...

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  • Load variation tracking automatic rated value breaker
  • Load variation tracking automatic rated value breaker
  • Load variation tracking automatic rated value breaker

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Embodiment Construction

[0051] The following is a specific implementation in conjunction with the accompanying drawings to further illustrate the working principle of the automatic rating circuit breaker for tracking load changes and the execution steps of the single-chip microcomputer and program memory storage program of the electronic control system 4. A typical single-chip microcomputer generally consists of the following parts. : Microprocessor MCU, program memory and data memory, or general-purpose memory for program and data, multiple input / output ports, multiple A / D converters, multiple timers / counters, communication ports and other hardware resources are assembled.

[0052] Among them, the program memory is used to store the execution program and data of the instruction sequence. The microprocessor MCU completes the expected operation result by reading and executing the relevant execution program and data in the program memory. The input / output port is used to connect external hardware...

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Abstract

The invention belongs to the technical field of high/low voltage electrical apparatuses. A load variation tracking automatic rated value breaker mainly comprises a movable/fixed contact component 1, an electric tripping mechanism 2, an electric reclosing mechanism 3, an electronic control system 4, current sensors L1, L2 and L3, an electrical leakage sensor L4 and a grounding sensor L5, wherein a signal acquisition and processing system which consists of a load voltage detection circuit, a load current detection circuit and a load current phase detection circuit is used as a main information source; variation in acquired load voltage and load current is used as a main basis for judging and differentiating a working state and a fault state of the breaker; meanwhile, the phase of the acquired load current and a calculated power factor are also used as main bases for judging and differentiating the working state and the fault state of the breaker; and a tripping protection program and a rated value updating and setting program are accessed according to judgment results; thus, a high-flexibility and high-precision protection characteristic is achieved, and accidents and fire disasters are avoided.

Description

technical field [0001] The invention belongs to the technical field of high and low voltage electrical appliances Background technique [0002] Modern society is inseparable from electric energy. Circuit breakers occupy an extremely important position in power transmission and distribution, and have a very high market share. Circuit breakers mainly have two functions: switching and protection. The protection function is a very important function of circuit breakers. [0003] The protection function of the circuit breaker is realized based on the rated value. The load current In is compared with the rated value Ir, and the judgment is made based on the comparison result, and then it is selected whether to enter the overload or short-circuit protection state. Generally, its rated value and size specification have been customized before leaving the factory, and the user chooses according to the current specification, and cannot customize its current specification. Although the...

Claims

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Application Information

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IPC IPC(8): H01H71/74H02H3/02
CPCH02H3/006H02H3/347
Inventor 张世兴
Owner 张 世兴
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