High-voltage direct-current cable outdoor terminal

Abstract

The invention relates to an outdoor terminal of a high-voltage direct current cable, comprising upper fittings, insulating sleeves, lower fittings, insulating fillers, cables, lower conductor lead-out rods, connecting conductors, upper conductor lead-out rods, stress cones, insulating sleeves, and upper fittings . The lower fittings form a sealed chamber 1, which is filled with an insulating filler. The inner bottom of the sealed chamber 1 is provided with a sealed chamber 2. The lower end surface of the connecting conductor is connected to the top of the sealed chamber 2 through the lower conductor lead-out rod, and the lower conductor lead-out rod extends to In the second sealed chamber, the upper end surface of the connecting conductor is connected to the upper conductor lead-out rod, and the upper conductor lead-out rod passes through the upper fitting and protrudes; the cable passes through the lower fitting and extends into the second sealed chamber, and is connected to the lower conductor lead-out rod, and the cable is close to the lower part Part of the conductor lead-out rod is sheathed with a stress cone. The stress cone is set in the second sealing chamber, which effectively isolates the contact between the stress cone and the insulating filler, avoids the aging of the stress cone material caused by the contact, and realizes long-term operation with high stability.

Description

technical field [0001] The invention relates to an outdoor terminal of a high-voltage direct current cable, belonging to the technical field of high-voltage direct current power systems. Background technique [0002] my country is rich in secondary energy resources such as wind energy, solar energy, and tidal energy, and the best transmission method for generating electric energy from such energy is to use flexible high-voltage direct current transmission, because high-voltage direct current cables not only have twice the transmission capacity of AC cables, but also transmit electric energy The loss is only 40% of the AC cable, so the power transmission distance can be greatly extended. The outdoor terminal is an important connector at the end of the transmission and distribution line. It plays an important role in improving the electric field distribution at the end of the DC cable and connecting the cable with other power transmission and transformation equipment. [0003...

AI Technical Summary

Problems solved by technology

[0003] At present, my country has invested huge efforts in the development of high-voltage DC cables, and my country's DC cable manufacturing technology has developed rapidly. However, the development of DC cable accessories, especially the outdoor terminals of DC cables with a large amount of consumption, is relatively lagging behind, which has seriously restricted the development of my country's high-voltage DC power system.

The existing high-voltage DC cable outdoor terminals have many shortcomings. For example, the stress cone is generally made of rubber, and the insulating filler is generally silicone oil or polyisobutylene oil. If the stress cone is immersed in the insulating filler for a long time, it is easy to cause damage to the stress cone material. Aging, reducing electrical performance, long-term operation can easily cause insulation damage, and there are potential safety hazards; there are defects in the structural design, and the electric field strength of the external insulating bushing is large, which is prone to pollution accumulation, causing pollution flashover or even breakdown, and poor sealing, which affects the cable safe operation of the system

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