Strong Short-Circuit Withstand Capability of Oil-Immersed Transformers

30 Jan 2024
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Oil-immersed transformers
are essential equipment in power systems, and their strong short-circuit withstand capability is a critical characteristic for ensuring the safe and stable operation of the power grid. This article focuses on discussing the key factors that contribute to the strong short-circuit withstand capability of oil-immersed transformers and their significant role in power systems.


High-Quality Insulation Materials:

The use of high-quality insulation materials is crucial in ensuring the strong short-circuit withstand capability of oil-immersed transformers. Insulation materials such as insulation paper and insulation layers should possess excellent insulation performance and mechanical strength. High-strength insulation paper and insulation layers with superior insulation properties effectively prevent short-circuit currents and provide sufficient arc resistance during short-circuit events.


Proper Design and Manufacturing Standards:

Proper design and adherence to strict manufacturing standards are essential for ensuring the strong short-circuit withstand capability of oil-immersed transformers. The design should include adequate insulation distances and structures to prevent arc discharges and short-circuit currents. Strict manufacturing standards ensure that internal components and connection structures of the transformer have sufficient strength and withstand capability to withstand the high currents and voltage stresses generated during short-circuit events.


Configuration of Protective Devices:

The appropriate configuration of protective devices is crucial in enhancing the short-circuit withstand capability of oil-immersed transformers. Short-circuit protection devices such as differential protection and overcurrent protection devices quickly detect short-circuit faults and isolate the faulty circuit, preventing current overloads and further damage to the transformer.


Regular Maintenance and Testing:

Regular maintenance and testing are key to maintaining the strong short-circuit withstand capability of oil-immersed transformers. Regular inspections of insulation materials' condition and insulation resistance, as well as the detection of internal partial discharges, help identify potential failures and aging issues of insulation materials, enabling timely repairs and ensuring the transformer's optimal performance.


System-Level Protection Strategies:

In addition to the transformer's own protective devices, implementing system-level protection strategies is an important measure in improving the short-circuit withstand capability of oil-immersed transformers. System-level protection measures include proper system grounding, accurate short-circuit current calculations and analysis, and the use of reliable protective devices and automatic circuit breakers.


Oil-immersed transformers possess a strong short-circuit withstand capability, playing a critical role in the safe operation of power systems. By selecting high-quality insulation materials, proper design and manufacturing practices, configuration of appropriate protective devices, regular maintenance and testing, and implementation of system-level protection strategies, oil-immersed transformers can effectively withstand short-circuit faults and ensure the stability of the power grid. The strong short-circuit withstand capability reduces the risk of failures and enhances the reliability and safety of power systems.

oil immersed power transformer
oil immersed hermetically sealed type transformer

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