Closing mode selection method, device and storage medium of cascaded transformer

A method selection and storage medium technology, applied in the field of transformer closing, can solve the problems of large excitation inrush current, affecting system stability, etc., and achieve the effect of reducing the closing excitation inrush current

Active Publication Date: 2020-11-06
STATE GRID BEIJING ELECTRIC POWER +1
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Problems solved by technology

[0007] Embodiments of the present invention provide a method, device and storage medium for selecting a closing mode of a cascaded transformer, so as to at least solve the problem in the related art that a large excitation inrush current is generated during the closing operation of various cascaded transformers, which affects system stability The problem

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  • Closing mode selection method, device and storage medium of cascaded transformer
  • Closing mode selection method, device and storage medium of cascaded transformer
  • Closing mode selection method, device and storage medium of cascaded transformer

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Embodiment Construction

[0033] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0034] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

[0035] At present, the closing operations of cascaded transformers in the start-up process of the emergency power supply system mainly include transformer cascading no-load closing, secondary transformer on-load closing, transformer cascading on-load closing, and two transformers and load closing step by step. Waiting for several kinds, but these kinds of operations will bring about the problem of excessive closing excitation inrush current. A single ...

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Abstract

The invention provides a switching-on mode selection method of cascade transformers and a switching-on mode selection device of cascade transformers. The method comprises the following steps that: excitation surge current values outputted by a primary transformer under more than two switching-on modes of the cascade transformers are determined by using a pre-established transformer switching-on operation mathematical model under a condition that input voltages are constant; and one of the more than two switching-on modes of the cascade transformers is selected according to the determined excitation surge current values. With the switching-on mode selection method and deice of the cascade transformers of the invention adopted, the problem that system stability is influenced by large excitation surge current generated during the switching-on operation of various cascaded transformers in the prior art can be solved, and an optimal switching-on operation mode enables the reduction of switching-on excitation surge current can be obtained.

Description

technical field [0001] The invention relates to a transformer closing technology, in particular to a method, device and storage medium for selecting a closing mode of a cascaded transformer. Background technique [0002] In order to improve the reliability of power supply to power users and reduce the impact of power supply failure on the normal life of users, emergency power supply will generally be provided for power users separately. When supplying power to power users, in case of mains power failure, the backup power supply will be used for emergency power supply, and the backup power supply must be used for emergency power supply. To start the emergency power supply system, the cascaded transformers in the system structure need to be closed. The cascaded transformer closing inrush current generated during this operation not only directly affects the closing operation scheme, but also the excessive excitation inrush current is likely to cause the transformer differential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/0073H02J2203/20
Inventor 刘若溪车瑶吴迪刘宏亮袁小溪杨青青
Owner STATE GRID BEIJING ELECTRIC POWER
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