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Novel lightning-protection technology used for neutral-point grounding system power grid

A lightning protection technology and power grid technology, applied in the field of super-energy capacity lightning protection, to achieve the effects of low operating voltage, reduced insulation requirements, and great economic benefits

Inactive Publication Date: 2015-03-25
深圳可雷可科技股份有限公司
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AI Technical Summary

Problems solved by technology

[0004] The patent of this invention uses material technology to solve the difficult problems of electrical engineering, and solves the problem that the existing arrester only protects against a single lightning overvoltage through the ZnO valve plate with high energy capacity and low field strength and the SiC valve plate with high energy capacity

Method used

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  • Novel lightning-protection technology used for neutral-point grounding system power grid
  • Novel lightning-protection technology used for neutral-point grounding system power grid

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Embodiment Construction

[0011] exist figure 1 In , the ZnO and SiC composite circuit configuration diagram of the three-phase AC power grid with a new lightning protection device installed in A, B, and C.

[0012] The patent of the invention connects three sets of high-voltage ZnO nonlinear resistors 3, 6, and 9 in parallel with three sets of high-energy SiC and high-energy ZnO nonlinear resistors 1, 2, 4, 5, 7, and 8 respectively in series to form a star connection. , its connection point is directly grounded, this circuit can effectively absorb transient overvoltage energy, suppress its overvoltage and clamp lightning and other transient overvoltage effects.

[0013] exist figure 2 Among them, the configuration diagram of ZnO and SiC non-linear resistor composite circuit with single-phase AC to ground, the function is the same as above.

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Abstract

The invention discloses a high-capacity lightning-protection technology applied to a power grid. The high-capacity lightning-protection technology is characterized in that three high-voltage ZnO nonlinear resistors (3, 6 and 9) are connected with three circuits formed by connecting high-capacity SiC nonlinear resistors (2, 5 and 8) with high-voltage ZnO nonlinear resistors (1, 4 and 7) in series in parallel, a star connection mode is adopted for connection, then the transient-state overvoltage and the instant overvoltage are suppressed through a lightning arrester in the mode that a connecting point 10 is directly grounded, and the overvoltage total-protection effect is achieved. By means of a novel lightning protection device manufactured with the high-capacity lightning-protection technology, an existing lightning protection device can be effectively replaced, the total protection effect on the overvoltage inside the power grid and the overvoltage outside the power grid is achieved, the requirement for insulation of electrical appliances is effectively lowered, and great economic benefits are brought to the society.

Description

technical field [0001] The invention patent is a super-capacity lightning protection technology applied to the power grid. Background technique [0002] At present, metal oxide surge arresters are the main products for power grid lightning protection and overvoltage protection. The ZnO non-linear resistors used in metal oxide arresters are high-field-strength, low-capacity valves, which can only provide limited protection against transient overvoltages generated by lightning strikes, and are susceptible to thermal collapse and explosion due to transient overvoltages. Therefore, in order to avoid transient overvoltage, the threshold voltage of commonly used arresters is relatively high, which often exceeds the insulation level of some electrical equipment. Often, the arrester has not yet operated, and the weak insulation equipment has been damaged or burned. [0003] The power grid urgently needs a new type of surge arrester technology that can take into account the insulati...

Claims

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Application Information

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IPC IPC(8): H02H9/04
Inventor 甘爱华胡鹏飞
Owner 深圳可雷可科技股份有限公司
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