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Transformer pre-magnetizing device and pre-magnetizing method thereof

A pre-magnetization and transformer technology, applied in circuit devices, magnetic objects, circuits, etc., can solve the problems of inability to maneuver, lack of flexibility, and bulky size, and achieve the purpose of reducing floor space, wide application, and suppressing inrush current. Effect

Inactive Publication Date: 2014-02-19
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

[0004] 1. Temporary external transformers for offshore operation devices have a certain degree of fluidity, and traditional technical solutions cannot meet the requirements of each temporary external transformer
[0005] 2. Large size, large footprint
[0006] 3. Fixed shape, lack of flexibility, unable to maneuver

Method used

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  • Transformer pre-magnetizing device and pre-magnetizing method thereof

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Embodiment Construction

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. And the features in the embodiments can be combined with each other.

[0028] The core of the present invention is to provide a transformer pre-magnetizing device, which is suitable for limiting the excitation inrush current when a large transformer in a three-phase three-wire power supply system is put into a small-capacity power grid, and the primary side of the transformer is connected in a delta connection, so that the transformer and the power grid are connected Protection, especially suitable for power systems of offshore operating devices.

[0029] Take the top drive transformer in the drilling part of the offshore platform as an example: its rated voltage is 400V, rated current is 577.4A, and rated capacity is 400kVA...

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Abstract

The invention discloses a transformer pre-magnetizing device and a pre-magnetizing method of the transformer pre-magnetizing device. The transformer pre-magnetizing device comprises an intelligent main open circuit device, a transformer input end switch device, a pre-magnetizing switch device, a pre-magnetizing slide rheostat and a control circuit. One end of the intelligent main open circuit device is connected with a main input circuit, the other end of the intelligent main open circuit device is connected with one end of the pre-magnetizing switch device and one end of the transformer input end switch device, the other end of the pre-magnetizing switch device is connected with one end of the pre-magnetizing slide rheostat, the other end of the transformer input end switch device and the other end of the pre-magnetizing slide rheostat are connected with a primary side of a transformer, and the control circuit controls the switching motions of the transformer input end switch device and the pre-magnetizing switch device. The invention further discloses the pre-magnetizing method with the transformer pre-magnetizing device adopted. The transformer pre-magnetizing device can limit an excitation surge current when the large-sized transformer is applied to a small-capacity power grid in a power supply system, so that the transformer and the power grid are protected.

Description

technical field [0001] The invention belongs to the technical field of safe power supply, and in particular relates to a transformer pre-magnetization device and a pre-magnetization method for a power system of an offshore operation device. Background technique [0002] With the increasingly heavy offshore operation tasks, the capacity of the power grid of offshore operation devices often cannot meet the power demand of many temporary operation tasks. Therefore, temporary transformers must be added to supply power for corresponding equipment. The excitation inrush current generated when the temporary transformer is connected to the power grid with no load will cause the protection device to malfunction and the high-order harmonics in the inrush current will damage the sensitive power electronic devices in the power grid. A large voltage drop affects the normal operation of other equipment in the power system. [0003] Among the existing technical solutions, only the series ...

Claims

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Application Information

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IPC IPC(8): H01F13/00H02J3/00
Inventor 崔嵘张万兵熊永功戴毅庄凌志武国营杨波王文俊傅剑峰黄启宇王居亲张林华
Owner CHINA NAT OFFSHORE OIL CORP
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