An sf6 gas insulated fully enclosed neutral point intelligent protection device

Abstract

The invention relates to the technical field of transformer neutral points, in particular to an SF6 gas-insulated totally-enclosed neutral point intelligent protection device which comprises a transformer main loop (1000) and a main grounding grid (2), and is characterized by also comprising a three-station isolating switch (13) of which the input end is communicated with the output end of the transformer main loop (1000). The three parallel output terminals of the three-station isolating switch (13) are respectively communicated with a lightning arrester loop (2000), a protection loop (3000)and a zero-sequence current loop (4000). The neutral point protection device is good in stability and high in environment adaptability.

Description

technical field [0001] The invention relates to the technical field of transformer neutral points, in particular to an SF6 gas-insulated fully enclosed neutral point intelligent protection device. Background technique [0002] At present, in the field of transformer technology, the traditional product structure is still used in the field of transformer AC neutral point complete protection devices. The device is generally composed of electrical components such as isolating switches, lightning arresters, protection gaps, and current transformers. Usually, there are the following problems: [0003] 1. At present, the protective device with lightning arrester cannot be tested for insulation; [0004] 2. The reliability of electronic components is not high in the natural environment, and the discharge gap is easily affected by the external environment, such as humidity, altitude and other factors. Therefore, even at the same voltage level, the electrode distance of the discharge ...

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Problems solved by technology

[0003] 1. At present, the protective device with lightning arrester cannot be tested for insulation;

[0004] 2. The reliability of electronic components is not high in the natural environment, and the discharge gap is easily affected by the external environment, such as humidity, altitude and other factors. Therefore, even at the same voltage level, the electrode distance of the discharge gap requires professionals Complicated calibration and adjustment according to the field use environment;

[0005] 3. Traditional open-type products are exposed to the air, and they are live equipment during operation, and a safe distance needs to be kept in accordance with the regulations of the corresponding voltage level;

[0006] 4. The product is exposed to the natural environment and is easily affected by the external environment, resulting in the product being vulnerable to damage, such as: sandstorm, salt spray, humidity, high and low temperature, altitude, animals, flammable and explosive materials, etc.;

[0007] 5. Separate factory and transportation, need to be equipped with installation bracket, need on-site assembly and debugging;

[0008] 6. Air is used as the insulation and arc extinguishing medium for arc exposure. The arc in the discharge gap is extinguished naturally, the arc burning time is long, and the arc energy is large, which is easy to cause fire or explosion, and is easy to cause damage to the power station, equipment and operation and maintenance personnel;

[0009] 7. The air-insulated open structure cannot be miniaturized and compact;

[0010] 8. Unable to realize online monitoring function and remote communication;

[0011] In addition, SF6 gas is used as an insulating and arc-extinguishing gas in electrical equipment. After a period of time, SF6 gas is consumed. In order to ensure the safety and stability of electrical equipment operation, it is necessary to make up for the consumed SF6, while the existing The method is mainly done manually, and the equipment itself cannot realize self-regulation; while the "consumption frequency" of SF6 gas needs to be tested during the commissioning stage, and traditional testing methods require repeated "pumping" and "inflating" steps, therefore, there are The test method is cumbersome; in addition, due to the aging of the equipment, during the later maintenance (for example: when adding SF6 gas), the metal impurities that fall off due to aging will enter the inflatable tube, which not only affects the efficiency of the later maintenance, but also if it cannot Timely discharge of this part of impurities will also affect the stability of maintenance equipment operation

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