In China's power system, the 6 kV, 10 kV, and 35 kV grids generally adopt a neutral-point ungrounded operation mode. The distribution voltage side of the main transformer in the grid is usually connected in delta configuration, which provides no neutral point for connecting a grounding resistor.When a single-phase ground fault occurs in a neutral-point ungrounded system, the line-to-line voltage triangle remains symmetrical, causing minimal impact on user operations. Moreover, when the capacitiv
12/03/2025
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Units with a capacity of 300MW and above are usually connected in a generator-transformer unit configuration and connected to the power system through the circuit breaker on the high-voltage side of the transformer. During the normal operation of the unit, the circuit breaker may trip automatically due to various reasons. Operators must make correct judgments and take timely measures to ensure the safe operation of the unit.1. Causes of Automatic Circuit Breaker Tripping Tripping due to relay pr
11/27/2025
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1.Analysis of the Structure and Working Principle of GN30 DisconnectorThe GN30 disconnector is a high-voltage switching device primarily used in indoor power systems to open and close circuits under voltage but no-load conditions. It is suitable for power systems with a rated voltage of 12 kV and AC frequency of 50 Hz or lower. The GN30 disconnector can be used either in conjunction with high-voltage switchgear or as a standalone unit. Featuring a compact structure, simple operation, and high re
11/17/2025
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