Safety Rules for Overhead Lines

1 Overview of Power Transmission and Distribution Lines1.1 Key Characteristics of Power Transmission and Distribution Lines High Maintenance Difficulty: This is mainly due to the wide area covered by power transmission and distribution lines, the harsh terrain of the laying areas, and the impact of seasonal climate changes, all of which contribute to difficult maintenance. High Requirement for Operational Reliability: The reliable operation of power transmission and distribution lines is closely

I. What is a Grid Voltage Overvoltage Fault?Grid voltage overvoltage refers to a phenomenon in power systems or circuits where the voltage exceeds the normal operating range.Generally, under power frequency, if the RMS (Root Mean Square) value of the AC voltage rises to more than 10% above the rated value and lasts for more than 1 minute, it can be determined as a grid voltage overvoltage fault.For example, in China’s common 380V three-phase grid system, if the voltage exceeds 418V and persists

Transformers are the "unsung heroes" of the modern world. These seemingly unremarkable devices, either hidden on utility poles or installed in substations, play an indispensable role in the power grid system—it is through them that electrical energy can be efficiently converted, transmitted, and utilized. Today, as humanity stands at the crossroads of an accelerating transformation in the energy landscape, recognizing the transformative potential of transformers and exploring how they will shape

1. Types of Faults on Power LinesPhase-to-Phase Faults: Three-phase short circuit Two-phase short circuitGround Faults: Single-phase to ground fault Two-phase to ground fault Three-phase to ground fault2. Definition of Relay Protection DevicesWhen an abnormality or fault occurs in a component of a power system, relay protection devices are those that can quickly and selectively isolate the faulty or abnormal component from the system, ensuring the continued normal operation of the remaining heal