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Electric network element operation overvoltage virtual earthing protection device

A technology of operating overvoltage and virtual grounding, which is applied in the direction of emergency protection circuit devices, emergency protection circuit devices, and electrical components used to limit overcurrent/overvoltage. Can not fundamentally solve problems such as operating overvoltage

Inactive Publication Date: 2007-12-05
张安斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the power transmission and distribution system, the switching or closing operation of components in the power grid, including transformers, motors, reactors, lines, capacitors, etc., is the most common operation in the system. This operation stimulates energy conversion and causes transients The increase in voltage produces overvoltage, which endangers the insulation of equipment, especially the overvoltage impact damage to cable lines, causing hidden dangers in operation safety
[0003] At present, there are zinc oxide overvoltage protectors and capacitor discharge coils for the overvoltage protection of these components in the power grid, but none of them can fundamentally solve the problem of operating overvoltage.

Method used

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  • Electric network element operation overvoltage virtual earthing protection device
  • Electric network element operation overvoltage virtual earthing protection device
  • Electric network element operation overvoltage virtual earthing protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] As shown in Figure 1-4, DL in the figure is the grid component control switch. When the transformer is installed with grid component operation overvoltage virtual grounding protection, the virtual grounding impedance is pure resistance. The equivalent circuit is shown in Figure 1-5, R' is the equivalent value of the virtual grounding resistance R to the primary side, Figure 1-5(a) is the equivalent circuit diagram of the transformer neutral point directly grounded, Figure 1-5(b ) is the equivalent diagram of the circuit with the neutral point of the transformer not grounded. It can be seen from the figure that when the no-load transformer is turned off, the virtual grounding resistance provides a channel for the energy stored in the no-load transformer winding to discharge, preventing the overvoltage generated by the no-load transformer from being turned off, and preventing the overvoltage due to overvoltage The contacts of the circuit breaker are re-ignited to damage t...

Embodiment 2

[0091] As shown in Figure 2-7, DL in the figure is the control switch of the power grid element. When the power grid element is installed on the line to operate the overvoltage virtual ground protection, the virtual ground impedance is pure resistance. energy, forming periodic oscillations to generate overvoltage, the overvoltage virtual ground protection device operated by grid components provides a discharge channel for oscillation energy, and the impedance Z in the virtual ground protection device operated by grid components quickly consumes the energy excited by closing, so from It fundamentally prevents the overvoltage of the no-load line closing; when the no-load line is cut off, the energy stored in the line-to-ground capacitor and the voltage on the capacitor cannot change suddenly. As mentioned above, a high overvoltage will be generated. The voltage virtual grounding protection device quickly absorbs and consumes the energy stored in the ground capacitance, so that th...

Embodiment 3

[0093] As shown in Figure 2-8, DL in the figure is the control switch of the power grid components. The overvoltage virtual grounding protection device of the power grid components is used to prevent the overvoltage of the reactive power compensation capacitor bank operation. The virtual grounding impedance is an adjustable resistance, and the input of the reactive power compensation capacitor The energy excited by closing is quickly absorbed and consumed by the overvoltage virtual ground protection device operated by the power grid components, preventing the generation of overvoltage on closing; High breaking overvoltage, power grid component operating overvoltage virtual grounding protection device quickly absorbs the energy stored in the reactive power compensation capacitor, fundamentally eliminating the operating overvoltage of the breaking capacitor. The three-phase fundamental wave voltage is added to 0 at the opening, and under normal conditions, the overvoltage virtual g...

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PUM

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Abstract

The invention relates to an electrical network part switching surge hypothesized ground protection installment, its characteristic is that establishes hypothesized grounding transformer on the end of the electrical network part, a side three-phase winding of the hypothesized grounding transformer separately turns on various phase lines which the part corresponds, its head and tail of the two side three-phase winding forms the series connected, the hatch installs between the any neighboring two phase windings, the two ends of the hatch stride connects the impedance to form the hypothesized earth, or directly short connects the hath to form the triangle connection on the two side of the hypothesized grounding transformer, forms the draining channel of excitation energy when the electrical network part operates. The invention has eliminated the cause of the switching surge, thus has fundamentally prevented the production of any switching surge, reliably protected the system insulation.

Description

technical field [0001] The invention relates to an overvoltage protection device applied in a power grid, more specifically a device for implementing protection against operating overvoltages of various power grid components including transformers, motors, reactors, lines, capacitors, etc. in the power grid. Background technique [0002] In the power transmission and distribution system, the switching or closing operation of components in the power grid, including transformers, motors, reactors, lines, capacitors, etc., is the most common operation in the system. This operation stimulates energy conversion and causes transients The increase of voltage produces overvoltage, which endangers the insulation of equipment, especially the overvoltage impact damage to cable lines, causing hidden dangers in operation safety. [0003] At present, there are zinc oxide overvoltage protectors and capacitor discharge coils for the overvoltage protection of these components in the power gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 张云一张安斌
Owner 张安斌