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Transient electrical impedance for current limiting of grid short circuit fault

A technology of short-circuit faults and transient electricity, applied in the field of power systems, can solve problems such as difficult large-scale application and promotion, and waste of electric energy, and achieve the effect of increasing the number of coil turns, ensuring stable operation, and increasing the overall impedance value

Active Publication Date: 2017-02-22
张健
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactor will have an impedance as high as several ohms to more than ten ohms during normal operation, and the power loss will be as high as hundreds of kilowatts, which will cause a great waste of electric energy, and it is difficult to apply it on a large scale.

Method used

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  • Transient electrical impedance for current limiting of grid short circuit fault
  • Transient electrical impedance for current limiting of grid short circuit fault
  • Transient electrical impedance for current limiting of grid short circuit fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: as figure 1 As shown, the present embodiment is a transient type electrical reactor for short-circuit fault current limiting of the power grid, which has an outer case 7, a main wire 2, an iron core 5 and a helical metal spring body 1, wherein the outer case 7 is filled with an insulating extinguisher. The arc medium 3, the main wire 2 pass through the casing box 7, the helical column metal spring body 1 is placed in the casing box 7, and the helical column metal spring body is connected in series to the main wire 2 (both ends of the spring body are respectively connected to the main wire ). The helical column metal spring body 1 has a built-in iron core 5, the iron core is covered with an inner sleeve 8, and the helical column metal spring body 1 is overcoated with an outer sleeve 9. The inner sleeve 8 and the outer sleeve 9 are made of high temperature resistant polymer, fluoroplastic or high temperature resistant ceramic material.

[0043] In this emb...

Embodiment 2

[0049] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that a spring tensioning device for tightening the metal spring body 1 of the helical column is added in this embodiment to increase the degree of compression of the spring body. Such as Figure 4 As shown, the spring tensioning device in this example includes a power-taking device 6 (such as a CT current transformer), a linear stretching electromagnet 10, a magnet pull rod 11 and a secondary spring 12, wherein the power-taking device 6 is a linear stretching type The electromagnet 10 supplies power, and the linear stretching electromagnet 10 is installed on one end of the metal spring body 1 of the helical column, and is fixed on the housing box 7. A magnet pull rod 11 is installed on the electromagnet, and the pull rod is connected to the metal spring of the helical column through a secondary spring 12. Body 1 is away from the electromagnet end.

[0050] During normal operation, the helical c...

Embodiment 3

[0051] Embodiment 3: as Figure 5 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that in this example, a spring telescopic operating mechanism for compressing and stretching the metal spring body 1 of the helical column is installed in the casing box 7, and this embodiment In the example, the helical column metal spring body 1 is a cylindrical helical compression spring with a rectangular section made of molybdenum metal. In this example, the spring telescopic operating mechanism includes main pull rod 13, auxiliary pull rod 14 and operating mechanism 15 (commercially available products, requiring action time less than 0.015 seconds, and its driving mode can be electromagnetic, spring, hydraulic, pneumatic, etc. One of the above types), wherein one end of the helical column metal spring body 1 is fixed to the housing box 7 through the main pull rod 13, and the other end is connected to the operating end of the operat...

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Abstract

The invention relates to a transient type electrical impedor used for grid short-circuit fault current limiting. The transient type electrical impedor used for grid short-circuit fault current limiting aims to be low in cost, rapid in action, safe and reliable so as to ensure stable operation of an electric system. According to the technical scheme, the transient type electrical impedor used for grid short-circuit fault current limiting is provided with a main wire and a shell casing, and is characterized in that the shell casing is internally provided with an iron core and a spiral column metal spring, the spiral column metal spring is connected to the main wire in series, the two ends of the spring are electrically connected with the main wire, the iron core is sleeved with the spiral column metal spring, the shell casing is filled with insulating arc-extinguishing media, the spiral column metal spring tightly retracts when a grid runs normally, the adjacent edges make tight contact with each other to form the barrel-shaped spiral column metal spring, and the spring extends to form a spiral coil when the grid short-circuit fault occurs.

Description

technical field [0001] The utility model relates to a transient electric reactor for electric network short-circuit fault current limiting. Applicable to power system. Background technique [0002] With the cross-regional interconnection of ultra-high voltage grids and the continuous operation of large-capacity supercritical generating units, the short-circuit current level of the power system is increasing day by day. The short-circuit current has exceeded the breaking capacity of the switch (such as 80KA or above), which makes the grid face the problem that there is no high-voltage circuit breaker to choose. In many 500KV grids, transformers have been operated separately in actual operation to reduce the impact current during short-circuit . Due to the lack of current limiting devices, short-circuit faults are seriously threatening the safe operation of the power grid. [0003] The short-circuit fault of the power system is very harmful to the normal operation of the hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 张健
Owner 张健