Transformer neutral point combination electric equipment

Abstract

The invention discloses a transformer neutral point combination electric equipment, comprising a base which is equipped with an insulation supporting column, a grounding column and a grounding diversion column, wherein the insulation supporting column is equipped with a high-voltage arm and a high-voltage electrode; the high-voltage arm is equipped with a fixed small contact; the grounding column is equipped with a grounding arm and a grounding electrode; the grounding arm is coupled with a grounding sleeve; the grounding sleeve is connected to an opening / closing regulation mechanism; the grounding diversion column is connected to a fixed large contact via a diversion plate; the grounding sleeve is equipped with a movable large contact; the grounding sleeve is passed through the fixed large contact; the end part of the grounding sleeve is correspondingly connected to the fixed small contact; and the movable large contact is correspondingly connected to the fixed large contact. The transformer neutral point combination electric equipment provided by the invention has the advantages that the fixed large contact, the diversion plate and the opening / closing regulation mechanism can be protected by setting a protection cover without changing the position of the diversion plate and the fixed large contact so as to reduce the corrosion caused by the pollutants in the atmosphere to the parts can be reduced, the device is used as a neutral point disconnecting switch; and when the device is in a closed state, the contact resistance of the circuit is more stable.

Description

technical field [0001] The invention relates to the field of electric power transmission technology, and is a transformer neutral point combined electrical device that combines the functions of individual equipment required by the current 110kV and 220kV transformer neutral points into an integrated device. Background technique [0002] According to the People's Republic of China Electric Power Industry Standard DL / T620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations", 110kV and 220kV power grids (hereinafter referred to as power grids) are effectively grounded grids, that is, in actual operation. The voltage to the ground (that is, the earth) is "0" or close to "0". The neutral point of this type of power grid must be effectively grounded. The grounding of the neutral point of the power grid is achieved through the grounding of the neutral point of the transformer in the power grid. In actual operation, the selective grounding operati...

AI Technical Summary

Problems solved by technology

[0005] 2. When this kind of power grid accidentally forms a local ungrounded power grid for some reason, and a single-phase ground fault occurs, under this abnormal working condition, the power grid may generate high power frequency overvoltage, which affects the safety of electrical equipment in the power grid. Therefore, according to the regulations of DL / T620-1997, the neutral point of the ungrounded transformer should be equipped with a rod-shaped air protection gap, also known as a rod gap.

Therefore, the overall weight is large and consumes a lot of porcelain resources

[0013] 3. The longitudinal length of the entire device is long after combination, which is not suitable for indoor and underground stations such as 110kV

[0014] 4. The GW13 series neutral point isolating switch is a double-rotary arm coupling structure, and the contact stability is not ideal.

[0015] 5. When the longitudinal arrangement length of the equipment reaches more than 3.5m, a double-pillar installation structure must be adopted, and the cost of foundation and pillars is high

However, this kind of transformer neutral point combined electrical device also has a disadvantage, that is, when the grounding bushing moves back and forth, the soft wire needs to move back and forth together with the grounding bushing, so the soft wire is not easy to fix, and it is not convenient for protection. Exposed to run in the air, the connection between the soft wire and the grounding guide column and the grounding bushing is easy to be polluted and corroded

In the event of severe meteorological disasters, the reliability of device operation will be reduced. At the same time, when the neutral point isolating switch is closed, the circuit resistance will increase, which may affect the normal operation of the entire device.

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