Overvoltage suppression protector suitable for 10kV distribution transformer

A distribution transformer and overvoltage technology, applied in the field of lightning arresters, to achieve the effect of reducing current, avoiding lightning strike damage, and suppressing current from sudden change

CN110137907AInactive Publication Date: 2019-08-16ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-08-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an overvoltage suppression protector suitable for a 10kV distribution transformer, and relates to the technical field of power distribution. The overvoltage suppression protector comprises a high-voltage-side arrester (M), a low-voltage-side arrester (N), an overvoltage suppressor (Y), and a grounding resistor (Rd). By utilizing the characteristic of an inductor coil to prevent the current from being abruptly changed, the high-frequency current flowing through the inductor coil is reduced, thereby reducing the leakage ground current. The inductor coil is connected in series with a Rogowski coil. By means of the function of the Rogowski coil for acquiring the high-frequency current signal, the high-frequency current waveform is recorded. Further, the Rogowski coil has a certain capability of suppressing overvoltage, suppresses an overvoltage rise inside the distribution transformer together with the inductor coil connected in series, thereby protecting the distribution transformer against lightning stroke.
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Description

technical field

[0001] The invention relates to the technical field of lightning arresters, in particular to an overvoltage suppressing protector suitable for 10kV distribution transformers. Background technique

[0002] Compared with the high-voltage level transmission network, the insulation level of the distribution network is low, and the probability of accidents in the distribution network caused by lightning overvoltage is relatively high. In order to increase the reliability of power supply, the distribution network generally adopts the neutral point non-effective grounding method, which also brings about the problem of high overvoltage level in the distribution network, and the insulation of distribution transformers caused by lightning and positive and negative conversion overvoltages often occurs. Breakdown, frequent blowing of high-voltage fuses, damage to lightning arresters and other accidents.

[0003] Lightning damage to transformers is mainly caused by forwa...

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the term "inner" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used , is only for the convenience of describing the present invention and simplifying the description, but does not indicate or i...