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Method and device for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid

A technology of conductive fluid and magnetic fluid, which is applied in the direction of protection against overcurrent, relays and circuits using electrodynamic effects, etc., can solve problems such as gas injection, failure to be well resolved, and aging of solid electrodes, and achieve The effect of limiting arc generation

Inactive Publication Date: 2010-02-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the device must have strict airtightness, and the problems of solid electrode aging and gas injection caused by decomposition products and bubbles in the driving fluid have not been well resolved.

Method used

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  • Method and device for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid
  • Method and device for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid
  • Method and device for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid

Examples

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Embodiment 1

[0116] A self-resetting current-limiting circuit breaker using conductive fluid and magnetic fluid such as figure 1 As shown, the magnetic field generating device 6 adopts a third connection form as shown in FIG. The packaging shell 1 is made of ceramic material, and forms two identical airtight cavities with the separator 23, the solid-state electrode terminal 2, and the solid-state electrode terminal 24, and the size of each airtight cavity (length×width×height) is 40mm×20mm× 20mm, using MF03 magnetic fluid 3 produced by Beijing Shenran Magnetic Fluid Technology Co., Ltd., with a density of 1320kg / m 3 , the saturation magnetization is 450GS, liquid metal gallium is used as the conductive fluid 4, and its density is 5907kg / m 3 , inject equal volumes of liquid metal gallium and magnetic fluid into the closed cavity respectively, with the magnetic fluid on the top and gallium on the bottom, the total volume of the magnetic fluid and liquid metal gallium accounts for 90% of the...

Embodiment 2

[0120] A self-resetting current-limiting circuit breaker using conductive fluid and magnetic fluid such as figure 1 As shown, the current limiting circuit breaking device is used in combination with the voltage loss protection device, as shown in Figure 4(c), and the magnetic field generating device 6 adopts the second connection form, as shown in Figure 3(b), in this embodiment An electromagnet with a maximum magnetic induction intensity of 0.1T is selected as the magnetic field generating device 6 . The controlled circuit 8 is used as the primary coil of the transformer device 22, and the circuit where the magnetic field generator 6 is located is used as the secondary coil of the transformer device 22. The connection form of the potentiometer 11 and the fixed value resistor 12 is shown in Figure 3(b). The packaging shell 1 is made of glass material, and forms two identical airtight cavities with the separator 23, the solid-state electrode terminal 2, and the solid-state elec...

Embodiment 3

[0124] A self-resetting current-limiting circuit breaker using conductive fluid and magnetic fluid such as figure 1 As shown, the current limiting circuit breaking device is used in combination with the voltage loss protection device, as shown in Figure 4(c), the magnetic field generating device 6 adopts the first connection form, as shown in Figure 3(a), in this embodiment An electromagnet with a maximum magnetic induction of 0.3T is selected as the magnetic field generator 6, and the connection form of the potentiometer 11 is shown in Figure 3(a). The packaging shell 1 is made of epoxy resin material, and forms two identical airtight cavities with the separator 23, the solid electrode terminal 2, and the solid electrode terminal 24, and the size of each airtight cavity (length×width×height) is 40mm× 20mm×20mm, using MF03 magnetic fluid 3 produced by Beijing Shenran Magnetic Fluid Technology Co., Ltd., using liquid metal mercury as the conductive fluid 4, and its density is 1...

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Abstract

The invention provides a method and a device for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid, belonging to the electric and automatic control field. The device comprises a main body and an auxiliary body; an encapsulated casing of the main body forms a closed cavity with an outside solid electrode terminal; the cavity is filled with conductive fluid and magnetic fluid hierarchically; when the number of the cavity is more than one, the cavity is internally provided with clapboards which is provided with inside solid electrode terminals; the cavity volume is divided by the clapboards equally, and each cavity is filled with the conductive fluid and the magnetic fluid hierarchically; the auxiliary body comprises a magnetic field generating device and a temperature regulating device; the main body part and the magnetic field generating device are accessed into a controlled circuit; when fault current exists in the controlled circuit, themagnetic field generating device generates large enough gradient magnetic field to rapidly separate the magnetic fluid from the solid electrode terminal so as to realize rapid breaking of circuits. Asthe response time is in a millisecond level, the invention can effectively protect security of electronic equipment and solves the problems such as contact burning, difficult breaking and the like, and the device has the self-recovery function.

Description

technical field [0001] The invention belongs to the field of electrical and automatic control, and relates to the basic engineering and remote automatic control technology of electrical switchgear, in particular to a current limiting and circuit breaking method and device for high-voltage, medium-voltage or low-voltage switchgear. Background technique [0002] In recent years, with the rapid development of my country's petrochemical, mining, metallurgy, machinery, textile and other industries, the power consumption is increasing and concentrated. As the capacity of the power system increases year by year, the short-circuit capacity and short-circuit current level of the power grid are also increasing. As components such as switches and fuses of circuit protection devices that are increasingly used in electronic and electrical fields, their breaking capacity And the requirements for reliable operation are constantly increasing, which has become an important issue restricting ...

Claims

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Application Information

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IPC IPC(8): H02H3/08H01H53/08H01H29/28
Inventor 王强赵立佳尤岳杨洪凯赫冀成
Owner NORTHEASTERN UNIV
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