Solid State Capacitance Switch

Abstract

The invention discloses a solid-state capacitance-adjusting switch which comprises a switch (1), a first auxiliary switch (2), a second auxiliary switch (3) and an electronic switch combination electric appliance (4) which are connected in series. An anode of the switch (1) is connected with a cathode of the first auxiliary switch (2), the anode of the first auxiliary switch (2) and an anode of the second auxiliary switch (3) are in parallel connection with the electronic switch combination electric appliance (4), and a terminal B at the tail end of a transformer coil is formed in a stretching mode. A cathode of the second auxiliary switch (3) and the cathode of the first auxiliary switch (2) are in parallel connection with the other end of the electronic switch combination electric appliance (4), and a terminal A at the head end of the transformer coil is formed in a stretching mode. The switch is simple in structure, reliable in operation, capable of effectively protecting an on-load capacitance-adjusting power distribution transformer, free of regular maintenance, free of arc operation and capable of reducing accidents.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering and relates to a solid-state capacity adjustment switch, which is suitable for capacity adjustment during the operation of on-load capacity adjustment distribution transformers. Background technique [0002] The on-load capacity regulating distribution transformer is a new type of energy-saving transformer with two types of rated capacity. It can effectively solve the problems of strong seasonality of distribution network load, large peak-to-valley difference, and serious loss. It is currently widely used in rural and rural areas. Urban commercial areas, development zones, industrial areas and other areas with large load fluctuations. The capacity adjustment principle is mainly realized by changing the connection mode of the distribution transformer winding through the on-load capacity adjustment switch. At present, the existing capacity adjustment switches are mainly oil switches ...

AI Technical Summary

Problems solved by technology

At present, the existing capacity adjustment switches are mainly oil switches using traditional mechanical adjustment methods. Its structure is complex and bulky, and it is easy to generate arcs when switching the capacity of distribution transformers. It has the disadvantages of slow adjustment speed, low mechanical life, and poor reliability. Periodic power outage maintenance for insulating oil is not suitable for frequent operation; and the existing technology cannot reliably protect the distribution transformer when the capacity adjustment switch fails, especially when the transformer needs to be adjusted from small capacity to large capacity. If the tolerance is not successful, the distribution transformer can only work at a small capacity, and the transformer will be overloaded if it is light, and it will be burned and damaged if it is serious.

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