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A kind of graphite resistor for neutral point of transformer

A transformer neutral point, graphite resistance technology, applied in the direction of resistors, resistance terminals/electrodes, electrical components, etc., can solve the problems of large short-circuit current, inability to install small reactances at the neutral point at the same time, complex system influence, etc., to achieve suppression The effect of DC bias, simple and reliable equipment, and simplified manufacturing process

Active Publication Date: 2016-08-03
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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AI Technical Summary

Problems solved by technology

[0002] At present, there are some methods to suppress DC current at home and abroad, such as the reverse current compensation method, but the control is complicated, the reliability is poor during operation, and it is easy to malfunction; High, the short-circuit current is large, and the influence of the device itself and the system is also relatively complicated, and it cannot be installed at the same time as the small reactance at the neutral point that limits the single-phase short-circuit current

Method used

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  • A kind of graphite resistor for neutral point of transformer
  • A kind of graphite resistor for neutral point of transformer
  • A kind of graphite resistor for neutral point of transformer

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Embodiment

[0023] A kind of graphite resistor for transformer neutral point, its structure is as follows figure 1 As shown, the manufacturing method provided by the present invention is composed of a lead-out terminal 1 , an electrode plate 2 , a graphite rod 3 , an insulating block 4 , an adhesive layer 5 , and a mounting base 6 .

[0024] Wherein, graphite rod 3 also can adopt graphite block, and its material selects suitable conductivity graphite powder to make according to user's requirement, and size is processed into the rod (block) material with smooth surface according to user's requirement, and graphite rod 3 along cuboid four sides Step-wise superimposition, the superimposed part is bonded with an adhesive layer 5 composed of high-temperature-resistant graphite conductive adhesive, and the two graphite layers are bonded and fixed with a high-temperature-resistant insulating block 4, and the insulating block 4 used can also be a quartz block , the two ends of the resistor are bo...

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Abstract

The invention relates to a graphite resistor for a transformer neutral point. The graphite resistor has a layer structure, wherein each layer is formed by laminating graphite rods or graphite blocks in a stepped mode along four surfaces of a cuboid and connecting the graphite rods or the graphite blocks in series; and all layers are adhered, supported and fixed by insulating blocks. Electrode plates are respectively arranged on the top of the resistor and at the bottom of the resistor, electrode leading-out ends are arranged on the electrode plates, and four bases for installation and fixing are arranged at the periphery of the bottom of the resistor. Compared with the prior art, the graphite resistor for the transformer neutral point has the advantages that resistance capacity is improved, and requirements on low resistance of the transformer neutral point are met. By adding the resistor to the transformer neutral point, direct current which flows through a main transformer neutral point can be effectively limited, and a transformer body and a system are slightly influenced and can be controlled. The graphite resistor adopts a simple operation mode and can be connected in series with a small reactor of the neutral point, and the problems of limitation on the direct current and single-phase short-circuit current can be simultaneously solved.

Description

technical field [0001] The invention relates to a power system transformer, in particular to a graphite resistor for a transformer neutral point. Background technique [0002] At present, there are some methods to suppress DC current at home and abroad, such as the reverse current compensation method, but the control is complicated, the reliability is poor during operation, and it is easy to malfunction; High, the short-circuit current is large, and the influence of the device itself and the system is relatively complicated, and it cannot be installed at the same time as the neutral point small reactance that limits the single-phase short-circuit current. [0003] In view of this, seeking a transformer neutral point DC bias suppression resistor has become the pursuit goal of those skilled in the art, and the manufacturing method of the resistor has also become the core of solving this problem. Contents of the invention [0004] The purpose of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C13/00H01C1/14
Inventor 李福兴
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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