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Failure current limiter

A fault current, limiter technology, applied in electrical components, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The problem of large on-state loss, etc., can improve the utilization efficiency, meet the requirements of limiting fault current, and simplify the structure of the device.

Inactive Publication Date: 2007-10-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires more complex and reliable GTO drive and synchronous control technology, otherwise the device will not work properly
[0004] (2) The on-state loss of GTO is large
[0005] At present, the above two problems have not been well resolved, thus limiting the application of fault current limiters with this structure

Method used

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  • Failure current limiter
  • Failure current limiter

Examples

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Embodiment Construction

[0019] The fault current limiter proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0020] The circuit of the present invention is shown in Figure 2, wherein, 1 is the current limiting unit that works on the positive half cycle of the grid voltage, and 2 is the current limiting unit that works on the negative half cycle of the grid voltage; wherein, the current limiting unit that works on the positive half cycle of the grid voltage , including: two fast recovery diodes D1 and DP1 working in the positive half cycle of the grid voltage; a current limiting inductor LP1 and a current limiting resistor R1; a three-phase uncontrolled rectifier bridge RCT1 providing DC bias current for the current limiting circuit, and A voltage regulating transformer T1 that provides AC input for the three-phase uncontrolled rectifier bridge; wherein the fast recovery diode DP1, current-limiting inductor LP1, current-li...

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PUM

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Abstract

This invented fault current limiter comprises: two current-limting units working for positive half-period and negative half-period of power network voltage, which two having respectively two recovery diodes, a current-limiting inductance, a current-limiting ersistance, a three-phase non wave rectifier to apply dc bias current to limiting-circuit and a regulating transformer to apply ac niput to three phase non wave rectifier. In this invention, according different load, by regulating branch termnial of regulating transformer by vary output voltage of non wave rectifier, so varying dc bias current in limiting circuit, the normal working current passes no current-limiting inductance and resistance, while fault of short circuit, the current passes current-limitnig inductance and resistance, so, limiting current of short-circuit. Advantages are: lost cost diode being substituted for expensive controllable electric power electronic device, so lowering the cost of said product.

Description

technical field [0001] The invention belongs to the technical field of power equipment, and in particular relates to a fault current limiter without using controllable power electronic devices. Background technique [0002] A fault current limiter is a device used to limit fault current. At present, the more practical fault current limiter is shown in Figure 1. It is mainly composed of three parts: a fast-acting GTO switch (including the snubbing circuit SNB of the GTO switch), a current-limiting impedance L, and a zinc oxide arrester Y , In addition, there are a set of devices for detecting current and a set of control devices (not shown in the figure). The GTO switch is driven by the rising rate of the current, and can be turned into an off state within tens of microseconds, and can break a large current. When working normally, the GTO switch is in a fully conductive state; when a fault occurs, the GTO is disconnected quickly, and the fault current flows through the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 姜齐荣黄玮
Owner TSINGHUA UNIV
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