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Brake current determination method and device, computer equipment and readable storage medium

A braking current and determination method technology, which is applied in the field of transformers, can solve problems such as inability to reliably brake differential currents, differential protection malfunctions, and affect reliable operation of transformers, so as to avoid differential protection malfunctions and improve braking performance. capacity, effects that improve stability and reliability

Active Publication Date: 2021-02-02
上海思源弘瑞自动化有限公司
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Problems solved by technology

Therefore, when an external ground fault occurs, if there is a problem with the transmission characteristics of the current transformer, and the fault zero-sequence current is not considered in the calculation of the braking current, it may not be possible to reliably brake the differential current, which will cause poor The malfunction of the automatic protection will affect the reliable operation of the transformer

Method used

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  • Brake current determination method and device, computer equipment and readable storage medium
  • Brake current determination method and device, computer equipment and readable storage medium
  • Brake current determination method and device, computer equipment and readable storage medium

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0034] figure 1 It is a schematic flow chart of a braking current determination method in an embodiment, such as figure 1 As shown, in one embodiment, a braking current determination method applied to transformer protection includes:

[0035] Step S120: Obtain currents on each side of the transformer and zero-sequence current components.

[0036] Specifically, the asymmetrical operation of the power system and the single-phase-to-ground fault are the main reasons for the generation of zero-sequence current. Und...

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Abstract

The invention discloses a brake current determination method and device, a computer equipment and a readable storage medium. The brake current determination method is applied to transformer protectionand comprises the steps: obtaining a current and zero-sequence current components of each side of a transformer; and determining a brake current according to the current of each side of the transformer and the zero-sequence current components. According to the method, a calculation method of incompletely filtering a zero-sequence current is adopted, the influence of the zero-sequence current components is considered when the brake current is calculated, a brake capability of the transformer in an out-of-zone grounding fault is effectively improved, and the sensitivity of differential protection is not influenced when an internal fault occurs; and when the out-of-zone grounding fault occurs, a condition of differential protection misoperation caused by a difference of transmission and transformation characteristics of a current transformer can be effectively avoided so that the stability and the reliability of the transformer are improved.

Description

technical field [0001] Embodiments of the present invention relate to transformer technology, and in particular to a braking current determination method, device, computer equipment and storage medium. Background technique [0002] In the power system, the longitudinal differential protection is the main protection commonly used in transformers, which can reflect the internal phase-to-phase short-circuit, single-phase grounding and inter-turn short-circuit faults of the transformer, and has high sensitivity. The longitudinal difference protection mainly calculates the data collected by the current transformers on each side of the transformer to obtain the corresponding differential current and braking current. Therefore, the steady state and transient characteristics of the current transformer are very important for the longitudinal difference protection. However, the transfer characteristics of general current transformers will have certain defects, and at the same time, fa...

Claims

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Application Information

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IPC IPC(8): H02H7/045H02H1/00
CPCH02H7/045H02H1/0092
Inventor 陈可友刘扬王红燕
Owner 上海思源弘瑞自动化有限公司
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