T/XJBX 0110-2025 Low-voltage electrical system short-circuit protection configuration specification

Scope

Low-voltage electrical systems are widely used in industrial, building, municipal, and civilian facilities. The safety and reliability of their operation directly affect the normal functioning of equipment and the safety of personnel. Short-circuit faults are one of the most common and dangerous types of faults in low-voltage electrical systems. If the protection configuration is not reasonable, it may lead to equipment damage, electrical fires, and even major safety accidents. With the continuous expansion of the scale of electrical systems and the continuous improvement of automation levels, traditional short-circuit protection methods have become difficult to meet the requirements of modern electrical systems for safety, selectivity, and reliability. In engineering practice, there are still problems such as improper selection of protection devices, unreasonable settings, and a lack of coordination between protection devices. This not only weakens the system's ability to resist short-circuit faults, but also may expand the scope of power outages and reduce power supply reliability. The International Electrotechnical Commission (IEC) and related domestic standard systems have put forward principled requirements for short-circuit protection in low-voltage electrical systems, but there is still a lack of unified, systematic, and actionable configuration specifications in practical applications. Therefore, the purpose of formulating this document is to standardize the configuration methods of short-circuit protection in low-voltage electrical systems, clarify the technical requirements for the selection and setting of protection devices, enhance the coordination and selectivity between devices, and ensure that the electrical system can quickly and effectively remove fault points when short-circuit faults occur, reducing the impact of accidents. This document is applicable to units engaged in the design, construction, operation, and maintenance of low-voltage electr

Development Information

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