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Short-circuit current suppression device based on phase change resistor

A phase change resistance, short-circuit current technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Disadvantages and other problems, to achieve the effect of reducing the degree of voltage sag, reducing the breaking capacity requirements, and improving the continuity of electricity consumption

Pending Publication Date: 2021-04-30
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JINHUA POWER SUPPLY CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large short-circuit current will cause a large amount of heat to be generated by the power distribution equipment. When the heat cannot be dissipated in time, the equipment may be damaged or even burned due to high temperature; It will generate extremely strong electric power, which will cause great impact damage to the equipment;
[0005] (2) Excessive short-circuit current is not good for breaking the circuit breaker;
[0006] (3) Cause losses to users: short-circuit faults cause voltage sags, affect the continuity of power consumption of sensitive loads, and bring economic losses to users
[0008] (1) Superconducting fault current limiter: the current is less than the superconducting critical current during normal operation, so the voltage drop of the superconducting material is close to zero, and the system loss is also very small. When the fault current level exceeds a certain threshold, the short-circuit current is controlled by the superconducting The conductive part is transferred to the non-superconducting part, the heat generation causes the superconductor to be in a quench state, the current limiting / current unit quickly becomes a high impedance state, and the fault current can be effectively suppressed, but the superconducting fault current limiter must be equipped with a large capacity cooling unit
[0009] (2) Magnetically controlled fault current limiter: use the saturated and unsaturated state switching of the current limiter core to realize short-circuit current limitation. The traditional winding magnetic saturation fault current limiter has relatively large steady-state operating loss, which may affect power transmission. The normal operation of the line, and the DC bias capability of the DC bias winding is highly required
The fault current limiter only consists of a fast switch and a reactor. It has simple structure, mature technology, low manufacturing cost, close to zero operating loss, and small footprint. The disadvantage is that the fast switch has a large breaking current and cannot be quickly reset after the fault is cleared.

Method used

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  • Short-circuit current suppression device based on phase change resistor
  • Short-circuit current suppression device based on phase change resistor
  • Short-circuit current suppression device based on phase change resistor

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Embodiment Construction

[0027] Such as figure 1 , figure 2 , image 3 and Figure 4 As shown, a short-circuit current suppression device based on phase change resistance is applied in distribution line 1, figure 1 The direction of the middle arrow indicates the current direction, and the distribution line includes a current transformer 2, including a phase-change resistor 3 connected in series on the distribution line 1, and the phase-change resistor 3 includes a phase-change layer 31 and electrodes arranged at both ends of the phase-change layer 32. The electrode is connected with a pulse signal that triggers the transition of the phase change layer from crystalline state to amorphous state, and the envelope of the pulse signal is proportional to the current of the power distribution line, and the duty of the pulse signal is The ratio is inversely proportional to the magnitude of the current in the distribution line.

[0028] By connecting a phase-change resistor 3 in series on the distribution...

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Abstract

The invention relates to a short-circuit current suppression device based on a phase-change resistor, the device comprises the phase-change resistor connected in series on a distribution line, the phase-change resistor comprises a phase-change layer and an electrode, and the electrode is connected with a pulse signal, and the device has the advantages that the phase-change resistor is connected in series on the distribution line and comprises the phase-change layer, the phase change layer is easy to realize conversion from a crystalline state to an amorphous state, so that the resistance of the phase change resistor is changed, the current of the distribution line is changed, the short-circuit level of the distribution line can be effectively reduced, the damage of the heat effect and the electrodynamic effect of short-circuit current to distribution equipment is reduced; the requirement on the breaking capacity of a circuit breaker can be reduced, the voltage sag degree caused by a short-circuit fault can be reduced before a fault loop of the circuit breaker is cut off, the power utilization continuity of a sensitive load is improved, and economic loss brought to a user is reduced.

Description

technical field [0001] The invention relates to a short-circuit current suppression device based on phase-change resistance. Background technique [0002] The distribution network is an important part of the power system. In the entire power system, the distribution network has the largest scale, the widest distribution and the most diversity. Its high-quality and reliable continuous power supply greatly affects the quality of power consumption of users and social economy. Coordinated development and social harmony. The occurrence of faults destroys the normal operation of the power grid, and the most influential ones are various short-circuit faults. In recent years, with the continuous increase of power supply load, the power system has gradually changed the previous isolated operation mode, and the close interconnection of major power grids has increased the short-circuit current, which has greatly affected the safe and stable operation of the power grid. impact, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 赵寿生崔建业张波赵冠军姚晖苏毅方张一航方旭光朱泽厅陈州浩邵先军童力金超徐洁黄洁敏林恺丰杨昶宇俞勤政卢鸣凯吴昊
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JINHUA POWER SUPPLY CO
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