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Anti-CT saturated sampling value differential protection of predicting CT linear transform area

A technology of linear transmission and differential protection, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as misjudgment, small harmonic content, system harmonic influence, etc., and achieve strong adaptability and fast action , high action sensitivity and reliability

Active Publication Date: 2008-05-21
NARI TECH CO LTD +1
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  • Claims
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AI Technical Summary

Problems solved by technology

However, this method is susceptible to the influence of system harmonics, and when the CT is deeply saturated, the content of harmonics becomes very small, which is easy to cause misjudgment

Method used

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  • Anti-CT saturated sampling value differential protection of predicting CT linear transform area
  • Anti-CT saturated sampling value differential protection of predicting CT linear transform area
  • Anti-CT saturated sampling value differential protection of predicting CT linear transform area

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Embodiment Construction

[0024] Figure 1 is a schematic diagram illustrating the periodicity of the linear transmission region in the present invention. When the CT is saturated, no matter how large the primary current is, the CT will not be saturated immediately, but there is a linear transmission region, which will also occur near the current zero crossing point. The linear transition area appears, and the linear transition area and the saturation area appear alternately in one cycle. The position of the linear transition area after one cycle can be predicted according to the currently known position of the CT linear transition area, and the predicted linear The differential criterion of sampled value is applied in the transition area to judge.

[0025] If it is an intra-area fault, since the CT does not have a linear transmission area at this time, the protection will operate.

[0026] For out-of-area faults, if the out-of-area fault develops into the area, the sampling value differential will act ...

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Abstract

The invention relates to an anti-CT saturation sampling value differential protection for predicting the CT linear transmission area, including: detecting the CT linear transmission area; predicting the linear transmission area after one cycle according to the currently known position of the linear transmission area location; in the predicted linear transmission area, apply the sampling value difference criterion to judge; if it is an internal fault, there is no linear transmission area, and the protection action; for an external fault, if it develops into the area, the sampling value difference If the fault is still outside the area, continue the above-mentioned protection judgment process of detecting the linear change area prediction, predicting the linear change area, and performing differential judgment of sampling values ​​in the predicted linear change area, and so on until Protective action or start return. The invention can judge the CT saturation, and can act quickly when the fault outside the zone is CT saturated and transfers to the zone; it is not affected by the degree of saturation; there is no limit to whether the CT is saturated when the fault is switched; it has high action sensitivity and reliability sex.

Description

technical field [0001] The invention relates to a power system detection and protection method, in particular to an anti-CT saturation sampling value differential protection for predicting CT linear transmission and change regions, and belongs to the technical field of power system automation control. Background technique [0002] In order to ensure the safe operation of the power system, necessary automatic protection devices, such as bus protection devices, must be equipped. In view of the fact that the current protection cannot act quickly for transitional faults in principle, it is necessary to have a criterion that can correctly distinguish CT saturation of external faults and internal faults and quickly judge transitional faults. [0003] In "Principles and Technologies of Relay Protection of High Voltage Power Grid" (Zhu Shengshi, China Electric Power Publishing House, July 2005, Chapter 14, Section 6 Bus Differential Protection) and "Principles of Relay Protection of...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 吴崇昊刘小宝戴魏
Owner NARI TECH CO LTD
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