Protective device for protecting transformer against geomagnetically induced currents

A protection device and transformer technology, applied in the field of power transformers, to achieve the effects of reducing heating, minimizing loss, and reducing operating noise

Active Publication Date: 2017-06-16
西门子能源全球两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With existing protection devices, these high GIC currents can only be managed at great expense

Method used

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  • Protective device for protecting transformer against geomagnetically induced currents
  • Protective device for protecting transformer against geomagnetically induced currents
  • Protective device for protecting transformer against geomagnetically induced currents

Examples

Experimental program
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Effect test

Embodiment Construction

[0047] figure 1 The connection diagram of the first exemplary embodiment of the present invention is shown in a simplified diagram. Reference numeral 10 designates the protective device as a whole. This basically consists of a grounded transformer 1 which connects the three phases of a supply line 2 (LINE) to a transformer 4 with ground potential 11 . Transformer 4 is housed in substation 3 .

[0048] In the energy supply network 12, electrical energy is converted from the high-voltage network (750-110kV) to the medium-voltage network in the substation 3, or from the medium-voltage network (for example, 10-30kV) to the low-voltage network (with a voltage of Secondary power distribution network), the substation 3 is also called a substation, a power distribution station or a power distribution substation. The substation 3 comprises: at least one transformer with corresponding switching systems for the medium voltage network and the low voltage network; and protective devices...

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PUM

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Abstract

The invention relates to a protective device for protecting a transformer against geomagnetically induced currents. Specifically, the invention relates to a protective device for a transformer (4), the protective device being connected on the high-voltage side via supply lines (2) to a network (12) for transmission and distribution of electrical energy, wherein the transformer (4) includes a neutral grounding (13), where each supply line (2) is connected to ground (11) via a grounding transformer (1), and where the grounding transformer (1) includes a neutral point resistance (R0GIC) which is lower than the neutral point resistance (R0sub) of the neutral grounding (13), such that Geomagnetically Induced Current (GIC) flowing on the supply lines (2) is diverted to ground (11).

Description

technical field [0001] The present invention relates generally to the technical field of power transformers, in particular to a protection device for a transformer connected on the high voltage side to a network for transmission and distribution of electrical energy by means of a supply line, wherein the transformer With neutral grounding (neutral grounding). Background technique [0002] It is well known that power transformers conventionally used in energy transmission and distribution networks may be exposed to so-called Geomagnetically Induced Current (abbreviated as GIC hereinafter), which can exceed 100 A and cause a loss in the operating characteristics of the transformer. serious failure. [0003] GICs are caused by strong solar winds that generate temporary changes in Earth's magnetic field. If such a temporary change in the Earth's magnetic field passes through a conductor loop (including, for example, a line section of an energy distribution network and the grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/02H01F27/38H01F27/28H02H7/04
Inventor P.哈姆伯格
Owner 西门子能源全球两合公司
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