Intelligent switched four-station load switch with double power supplies

Abstract

The invention relates to the switch technical field, in particular to an intelligent switched switch with double power supplies, comprising a switch cabinet. A first power supply line inlet contact, a second power supply line inlet contact, a line outlet contact, a switching mechanism and an opening and closing mechanism are arranged on the switch cabinet. The switching mechanism is provided witha movable contact and is capable of switching the movable contact between the first power supply line inlet contact and the second power supply line inlet contactrespectively. The opening and closingmechanism is arranged under the movable contact and matched with the movable contact. The opening and closing mechanism comprises a second movable contact matched with the movable contact. The lower end of the second movable contact is movably connected with the line outlet contact. In the invention, the switching process between the first power supply and the second power supply is in intelligent automatic control without the operation of people; the power supply instantaneity of the switch is ensured; the power supply reliability of the power supplies is improved; and simultaneously, the switch disclosed by the invention is simple in structure, convenient for maintenance and repair and also very safe for overhaul.

Description

technical field [0001] The invention relates to the technical field of switches, in particular to a 10kv-20kv dual power supply intelligent switching four-position load switch. Background technique [0002] In the power network, many users have high requirements on the reliability of power supply, such as coal mines, oil refineries, etc. Once a power outage occurs in these units, it will bring major economic losses or even casualties to the unit, so the power supply system of these units In all of them, a backup power supply is required. When the main power supply fails, the backup power supply must be put into use immediately, so it is necessary to switch between the main power supply and the backup power supply through a dual power supply switching mechanism; [0003] At present, the domestic dual power supply switching mechanism uses at least two circuit breakers, and connects the incoming line end of each circuit breaker to a power supply, and then connects the outgoing ...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic dual power supply switching mechanism uses at least two circuit breakers, and connects the incoming line end of each circuit breaker to a power supply, and then connects the outgoing line ends of the two circuit breakers together, and realizes the alignment through the electrical interlocking device. Switching between the main power supply and the backup power supply, the disadvantage of this dual power supply switching mechanism is that it has poor reliability and may cause serious accidents. For example, when the main power supply circuit is powered off for routine maintenance, the main power supply connection may be disconnected The coil in the circuit breaker is burned out, but the circuit in the circuit breaker is still in the open state. At this time, another circuit breaker in the dual power supply switching mechanism of the medium will immediately connect to the backup power supply to continue supplying power, which will cause the original should The cut-off main power supply circuit is also charged, which can easily lead to electric shock accidents for maintenance personnel who overhaul the main power circuit. In addition, since two circuit breakers need to be purchased, the investment is relatively large and the structure is complicated, inconvenient for maintenance and high in investment costs.

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