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Resonance type current limiter based on insulator-metal phase change resistor

A metal phase change, insulator technology, applied in other resistor networks, resistors with negative temperature coefficients, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. problem, to achieve the effect of low loss, small steady-state impedance, and small steady-state impact

Inactive Publication Date: 2015-04-08
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arrester is used as the bypass circuit. Although the response speed is fast, the arrester has a certain residual voltage, and the loss is large when passing the short-circuit current.

Method used

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  • Resonance type current limiter based on insulator-metal phase change resistor
  • Resonance type current limiter based on insulator-metal phase change resistor
  • Resonance type current limiter based on insulator-metal phase change resistor

Examples

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The present invention adopts VO 2 , V 2 o 3 Resistor modules made of sheets, blocks or thin films of equal negative temperature coefficient phase change materials are combined in series and parallel to form insulator-metal phase change resistance Rpc, which is applied to series resonant fault current limiter, which can improve the rapidity and reliability of response. figure 1 VO shown 2 The change curve of material resistivity with temperature, it can be seen that VO 2 The phase transition temperature is between 320K-340K. When it is higher than the phase transition temperature, VO 2 The resistivity can be reduced by 4-5 orders of magnitude, from a semiconductor to a good conductor.

[0023] figure 2 Embodiment 1 of the present invention is a resonant current limiter based on an insulator-metal phase change material. The current...

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Abstract

Provided is a resonant current limiter based on an insulator-metal phase change resistor. The resistor (RPC) made of an insulator-metallic phase change material is in parallel connection with a capacitor (C), and then is in series connection with a reactor (L). While in normal operation, the phase change resistor (RPC) is in a high-resistance state, the current passing therethrough is low, the temperature rise is low, the current mainly flows through a circuit formed by the reactor (L) and the capacitor (C) in series connection, and the reactor (L) and the capacitor(C) form a serially connected resonant circuit which is in a low-impedance state and has small influence on a power grid system. When the power grid system breaks down and is short-circuited, the current flowing through the phase change resistor (RPC) is increased, the temperature is rapidly increased, and the insulator-metal phase change material undergoes phase change and enters a low-resistance state. The short-circuit current is transferred to the phase change resistor (RPC) branch from the capacitor (C) branch, the impedance of the power grid system is increased, and the short-circuit current is reduced. The insulator-metal phase change material is a negative-temperature coefficient insulator-metal phase change material of VO2, V2O3 and the like.

Description

technical field [0001] The invention relates to a series resonance type current limiter. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, power supply reliability and security. However, the transient stability of large power grids is more prominent, and one of the most importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
CPCH02H9/02H01C1/16H01C7/04
Inventor 肖立业邱清泉张志丰戴少涛林良真屈飞
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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