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YBCO high-temperature superconducting strip-based short circuit fault current limiter

A technology for high-temperature superconducting strips and short-circuit faults, which is applied in the usage of superconductor elements, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., and can solve problems such as technical difficulty and high cost of bias power supply , to achieve the effects of easy implementation, small steady-state impact, and high reliability

Inactive Publication Date: 2010-06-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

At the same time, the current flowing through the bias power supply is often 2 to 3 times the grid current, and must meet the requirements of the current change in the non-fault state and the fault state. Therefore, the realization of the bias power supply has certain technical difficulties and high requirements. cost

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  • YBCO high-temperature superconducting strip-based short circuit fault current limiter
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  • YBCO high-temperature superconducting strip-based short circuit fault current limiter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0022] Such as figure 2 As shown, the specific embodiment 1 of the present invention is a single-phase short-circuit fault current limiter. The short circuit fault current limiter consists of a first diode D 1 , the second diode D 2 , the third diode D 3 and the fourth diode D 4 Composed of rectifier bridge, protection diode Ds, protection resistor Rs and high temperature superconducting coil SL. where the first diode D 1 and the second diode D 2 The connection point is the first AC terminal A, the third diode D 3 and the fourth diode D 4 The connection point is the second AC terminal B, the first diode D 1 and the third diode D 3 The connection point is the first DC terminal M, the second diode D 2 and the fourth diode D 4 The connection point of is the second DC terminal N. The series circuit of the protection diode Ds and the protect...

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Abstract

The invention discloses a YBCO high-temperature superconducting strip-based short circuit fault current limiter. The direct current end of a diode rectifier bridge of a current limiter is connected in parallel with a current limiting coil; and the current limiting coil is formed by winding a YBCO high-temperature superconducting strip. The current limiting coil has the characteristic of a direct current reactor. When a power grid is in a steady state, the current limiter has no influence on the power grid. Once a short circuit fault happens, when a fault current passes through the current limiting coil, the YBCO high-temperature superconducting strip quenches to generate resistance to realize fault current limiting. The superconducting current limiter of the invention can realize automatic fault triggering and automatic current limiting, and can automatically generate current limiting impedance with different intensities according to the intensities of the fault current. The current limiter has strong current limiting capability and little influence on the steady state of the power grid.

Description

technical field [0001] The invention relates to a fault current limiter for a transmission and distribution network, in particular to a short-circuit fault current limiter based on YBCO high-temperature superconducting tape. 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, powe...

Claims

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Application Information

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IPC IPC(8): H02H9/02
CPCY02E40/69Y02E40/60
Inventor 张志丰张京业周义刚戴少涛肖立业
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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