A multi-voltage automatic switching device on the input side of a transformer

Abstract

The invention provides a multivoltage automatic switching device on the input side of a transformer. The multivoltage automatic switching device comprises a plurality of voltage monitoring relays, a plurality of contactors and a plurality of voltage gears, wherein the voltage monitoring relays are used for monitoring voltage between phases and can monitor the upper limit and the lower limit of voltage values; the contactors are respectively connected into corresponding main circuits of primary sides of the transformer; the first voltage gear corresponds to the first contactor, and the ith voltage gear corresponds to the ith contactor; the first voltage gear corresponds to the first voltage monitoring relay, and the jth voltage gear corresponds to the jth voltage monitoring relay; N is an integer not smaller than 2, i=2, 3, 4, ..., N, and j=2, 3, 4, ..., N. The multivoltage automatic switching device resolves the problems that offshore containers at present needs to be adapted to the wide supply voltage ranges of different production platforms or oil production boats, potential safety hazards are caused by manual operation, and operation is inconvenient.

Description

technical field [0001] The invention relates to a voltage automatic switching device, in particular to a three-phase multi-voltage automatic switching device below 690V. Background technique [0002] The main power supply on the oil production platform or oil production ship mostly comes from the generator set, and the platform or oil production ship generator set of different countries will have different power output. 660V and 690V power supply voltages are also available. When the offshore container service module is used as an office, laboratory, workshop or even a staff dormitory on a platform or an oil production ship, the internal electrical appliances mostly use the rated power frequency voltage, such as three-phase 380V, 400V and 415V, single-phase 220V, 230V or 240V. Therefore, when the power distribution room of the platform or oil production ship does not match the power supply of the container service module, the power supply voltage must be changed to a volta...

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Problems solved by technology

[0004] The disadvantage of this method is that it must be operated by qualified professional electricians or electrical engineers on the platform. In fact, when the container service module is in normal use, it is difficult for the operators in the box to meet this condition, and non-professional electricians do not realize it. The impact of incorrect voltage selection on subsequent equipment, resulting in damage to subsequent electrical equipment, especially when some container service modules such as positive pressure warehouses require relatively more complicated operations, the probability of problems is greater

According to current experience, every year some service modules have equipment damage due to this problem, and have to be withdrawn from the platform or production vessel for repair or even internal reconstruction

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