High voltage load switch-fuse combination switch

Abstract

The invention provides a high-voltage load switch-fuse combined switch. The combined switch comprises a load switch mechanism, a grounding switch mechanism, a grounding switch, a plurality of vacuum load switches and a plurality of high-voltage fuses, wherein the load switch mechanism is connected with the vacuum load switches and the grounding switch mechanism and is used for controlling disconnection or connection of a circuit by the vacuum load switches, the grounding switch mechanism is connected with the grounding switch and is used for controlling switch-off or switch-on of the grounding switch, the vacuum load switches are connected with a power distribution line and a high-voltage fuse and are used for controlling conduction or cutoff of electric energy of the circuit, the high-voltage fuse is connected with an external power utilization circuit and is used for cutting off electric energy input of the circuit when the circuit reaches a preset threshold value or triggering other high-voltage fuses to cut off the electric energy input of the circuit when the electric energy input of the circuit is cut off, and the grounding switch is connected with the vacuum load switches and the high-voltage fuse and is used for controlling the vacuum load switches and the high-voltage fuse to be connected with the ground by closing the grounding switch.

Description

technical field [0001] The invention relates to power distribution equipment in the field of power distribution, in particular to a high-voltage load switch-fuse combined switch for an integrated distribution type fully insulated power distribution station area. Background technique [0002] In the transformation process of urban and rural distribution networks, the large-scale construction and renovation of distribution stations has significantly improved the power supply capacity and quality of distribution stations; with the vigorous construction of smart distribution stations, the intelligent distribution stations The level of modernization has been further improved, meeting the new requirements of customers for power supply capacity, power supply quality and power supply services; with the development of distribution network standardization, in order to effectively improve the interchangeability and versatility of equipment in distribution stations, the The construction...

AI Technical Summary

Problems solved by technology

[0003] The construction of the distribution station area is a comprehensive and complex project. At present, there are the following problems in the construction and operation of the distribution station area: there are many on-site construction procedures and a long construction period; there are many on-site installation equipment and many equipment connections, resulting in a large on-site workload ;The construction process is easy to cause waste of materials; different installation technical specifications in various places lead to differences in station area construction and functional configuration, disorderly installation of old station area equipment, messy wiring, and poor visual perception; low power supply reliability, rust and aging of equipment after being exposed to the air It is difficult to solve problems such as being easily damaged by external forces, many high and low voltage exposed live parts, high failure rates of dropout fuses and isolating switches, lack of monitoring or even no monitoring in distribution station areas; uneconomical operation and maintenance, long and difficult operation and maintenance Large, inconvenient equipment replacement; large floor area, high construction cost

In particular, the high-voltage switches used in distribution stations are generally separated, with large volume, large floor space, and unreliable electrical insulation performance, which hinders the improvement of power supply reliability.

[0004] Conventional lines that are only protected by fuses often adopt a separate single-phase fuse protection structure layout. The load switch or circuit breaker that comes with the line does not have linkage protection with the same-phase fuse. When the line outlet current fails abnormally, the fault phase The line is cut off, and the non-faulty phase line is still running, resulting in the lack of phase operation of the distribution line. The long-term phase loss of the non-faulty cut-off line causes overload operation, which often causes thermal burnout and thermal failure of the electrical load.

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