35kV box-type transformer low-voltage side circuit breaker protection method

CN119627793AActive Publication Date: 2025-03-14HUANENG HUILI WIND POWER GENERATION CO LTD
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Patent Information

Application Number
CN202411520610.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-03-14
Estimated Expiration
2044-10-29

AI Technical Summary

Technical Problem

The excitation surge current generated by the 35kV box transformer when closing or reclosing may exceed the set value of the relay protection device, causing the protection device to malfunction and the circuit breaker to malfunction, causing the transformer to be shut down, affecting the stable operation of the power system.

Method used

By setting multiple feature indicators and running simulation models, the expected change curves of each feature indicator are generated, the first-level protection strategy is dynamically adjusted, and the risk of misoperation of the circuit breaker is reduced. Specific methods include building a gradient selection mechanism to avoid mismoving the circuit breaker due to transient excitation surge current.

Benefits of technology

It effectively reduces the risk of misoperation of the circuit breaker, ensures the safe operation of the transformer, and avoids shutdowns caused by misoperation and instability of the power system.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of box-type transformers, in particular to a protection method for a circuit breaker on the low-voltage side of a 35kV box-type transformer. Comprising the steps of generating a historical evaluation value according to equipment parameters and historical operation parameters, and constructing a plurality of adjustment periods according to the historical evaluation value; setting a first-level protection strategy in each adjustment period in sequence; and obtaining operation parameters of the circuit breaker according to a preset feedback time node, and judging whether a maintenance instruction is generated or not. According to the operation parameters of the circuit breaker, a plurality of characteristic indexes are set, and an expected change curve of each characteristic index is generated by establishing an operation simulation model, so that the state of the circuit breaker in each adjustment period is predicted, a corresponding primary protection strategy is dynamically adjusted, the maloperation risk of the circuit breaker is reduced, and the safe operation of a transformer is ensured.
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Citation Information

Patent Citations

  • Life cycle evaluation and fault early warning method for high-voltage circuit breaker

    CN110705038A

  • Online monitoring method and system for fault of high-voltage switch cabinet

    CN118473081A

  • High-capacity transformer protection system

    CN118473093A

  • Transformer protection circuit and method

    US20150311697A1

Cited By

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