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Direct current current-limiting device of neutral point of grounding transformer

A technology of grounding transformers and direct current, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Neutral point inflow and other problems, to achieve the effect of simple structure, simplified structure and reduced volume

Active Publication Date: 2009-07-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Although this method is simple in principle, it also has many disadvantages: a. It cannot completely suppress the inflow of DC from the neutral point; Conditions, soil moisture content, mineral content, buried metal and many other influencing factors cannot be fully calculated
The common disadvantage of these two schemes is that they are equipped with a thyristor shutdown circuit with a complex structure, and the structure of the first scheme is more complicated due to the existence of a diode rectifier bridge.

Method used

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  • Direct current current-limiting device of neutral point of grounding transformer

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0014] Such as figure 1 As shown, the current suppression device 1 of the present invention includes a capacitor C1, switches K2, K3, a trigger circuit 2 and n groups of parallel bidirectional thyristor solid-state switches S1, S2,..., Sn, wherein n is the number of parallel bidirectional thyristor solid-state switches, n ≥1. In the figure, T is a transformer, and switch K1 is a direct grounding knife switch for the neutral point of the transformer.

[0015] The switch K2 is connected in parallel at both ends of the neutral point grounding switch K1 of the transformer T, and is a switching switch for suppressing the DC current device at the neutral point of the transformer;

[0016] Capacitor C1 is connected in parallel at both ends of switch K2. Under the normal working condition of the device, it prevents DC current from flowing from the ground to the n...

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Abstract

The invention discloses a neutral point direct current suppressing device of a grounding transformer, which belongs to the technical field of electrical engineering. The device is characterized in that it contains a DC blocking capacitor, a thyristor solid-state switch directly connected in parallel with both ends of the DC blocking capacitor, a trigger unit thereof, a current limiting reactor and a bypass switch. The invention can effectively suppress the transformer neutral point direct current caused by high-voltage direct current transmission or geomagnetic storm, and avoid problems such as harmonic increase, noise increase, overheating and possible protection malfunction caused by direct current bias of the transformer. The invention can omit the uncontrolled rectification part, so that the structure is simplified and the cost is reduced; the turn-off structure of the anti-parallel thyristor is simple, and no external reverse voltage is needed.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a neutral point direct current suppression device for a grounding transformer. Background technique [0002] High-voltage direct current transmission (HVDC) is more and more used in my country, and it plays a very active role in the interconnection of regional power systems, but it also brings some new problems, for example, the transformer DC caused by the asymmetric operation of HVDC. Bias problem. Therefore, it is necessary to develop a device that can inhibit the DC current from flowing into the neutral point of the transformer, so as to effectively avoid the DC bias phenomenon of the transformer. When the HVDC operates in the unipolar ground return line or the bipolar asymmetric operation mode, there is a DC potential near the ground electrode, which is related to the magnitude of the current delivered by the HVDC and the soil resistivity there. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/04H02H9/02
Inventor 毛承雄陆继明王升王丹
Owner HUAZHONG UNIV OF SCI & TECH
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