Device for connecting GIS and transformer

Abstract

The invention discloses a device for connecting a GIS and a transformer, which comprises three single-phase cylinders and an oil-gas sleeve. The end part of each single-phase cylinder is fixedly connected with a corrugated pipe, the oil-gas sleeve is integrally and horizontally arranged, one end of the oil-gas sleeve is connected with the transformer, and the other end of the oil-gas sleeve extends into the single-phase cylinder through the corrugated pipe. A first flange is arranged on the outer side of the oil-gas sleeve, one side of the first flange is fixed to the transformer, and the other side of the first flange is fixedly connected with the corrugated pipe. A main conductor and a connecting conductor are arranged in the single-phase cylinder, one end of the main conductor is installed at the end of the single-phase cylinder, the other end of the main conductor is connected with the connecting conductor through a flexible connecting piece, a connector base is installed on the connecting conductor, and the end of a live conductor in the oil-gas sleeve is inserted into the connector base and electrically connected with the connecting conductor. According to the oil-gas sleeve horizontal outgoing line, the oil-gas sleeve and the main conductor are connected through flexible connection, so that vibration transmitted to a GIS from a transformer is weakened, fatigue damage of the oil-gas sleeve is effectively avoided, and the service life of the oil-gas sleeve is prolonged.

Description

technical field [0001] The invention belongs to the technical field of high-voltage switches, in particular to a device for connecting GIS and a transformer. Background technique [0002] There are generally three connection methods between gas-insulated fully enclosed combined electrical appliances (GIS) and transformers. One is the connection between GIS and transformers through outlet bushings and steel strands. This connection structure is large in size and occupies a large area; Connecting the transformer, this connection method is expensive and occupies a large area; the third is that the GIS uses sulfur hexafluoride (SF 6 ) gas branch bus barrel, oil and gas bushings are directly connected to the transformer, but in this connection, the oil and gas bushings are installed vertically, and filled with sulfur hexafluoride (SF 6 ) The length of the branch bus barrel of the gas is longer, the cost is also high, and the volume is also larger. [0003] Nowadays, the urban l...

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Problems solved by technology

[0002] There are generally three connection methods between gas-insulated fully enclosed combined electrical appliances (GIS) and transformers. One is the connection between GIS and transformers through outlet bushings and steel strands. This connection structure is large in size and occupies a large area; Connecting the transformer, this connection method is expensive and occupies a large area; the third is that the GIS uses sulfur hexafluoride (SF 6 ) gas branch bus barrel, oil and gas bushings are directly connected to the transformer, but in this connection, the oil and gas bushings are installed vertically, and filled with sulfur hexafluoride (SF 6 ) The length of the branch busbar of the gas is longer, the cost is also high, and the volume is also larger

[0003] Nowadays, the urban land is tight, and the substation requires a small footprint. If the GIS is directly connected to the transformer horizontally, the butt branch busbar barrel is extremely short, which can reduce the floor space. The main reason is that when the transformer is energized and running, the magnetostriction caused by the alternating magnetic flux in the iron core will cause the transformer to vibrate up and down, so that the oil-gas bushing connected to the transformer will also vibrate up and down.

If the oil and gas casing is installed horizontally, the movement of the end of the oil and gas casing connected to the GIS is restricted, which means that a force perpendicular to the axis of the oil and gas casing is added to this end, causing fatigue damage to the oil and gas casing and shortening the length of the oil and gas casing. The life of the tube; and the vibration will also be transmitted to the GIS, affecting the life and sealing performance of the contact fingers in the GIS

In addition, the three-phase center distance of the transformer and the GIS three-phase center distance are prone to manufacturing errors, which also makes the docking difficult

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