What are the common faults of load switches?
Felix Spark
Field: Failure and maintenance
China
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Analysis of Abnormal Causes of High-Voltage Cable Grounding Circulation and Typical Cases
I. Introduction to Cable Grounding Loop CurrentCables rated 110 kV and above use a single-core structure. The alternating magnetic field generated by the operating current induces a voltage on the metallic sheath. If the sheath forms a closed circuit through the earth, a grounding loop current will flow on the metallic sheath. Excessive grounding loop current (loop current exceeding 50 A, more than 20% of the load current, or a ratio of maximum-to-minimum phase current greater than 3) not only a
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Repair of high-voltage cable metallic sheaths
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Working Principle and Arc Extinction Mechanism of Magnetic Blowout Device in DC Circuit Breakers
The arc extinguishing system of a DC circuit breaker is crucial for the safe operation of equipment, as the arc generated during current interruption can damage contacts and compromise insulation.In AC systems, the current naturally passes through zero twice per cycle, and AC circuit breakers take full advantage of these zero-crossing points to extinguish the arc.However, DC systems lack natural current zero crossings, making arc extinction significantly more difficult for DC circuit breakers. T
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Analysis of Common Operational Fault Causes in Smart Electricity Meters
With the continuous development of smart grids, smart electricity meters are being increasingly widely applied, and various types of operational faults in smart meters are frequently encountered in energy measurement work. This paper analyzes the causes of smart meter failures and proposes corresponding solutions, using several actual operational fault cases as examples.1. Black ScreenA black screen refers to a powered meter with no display, which is the most commonly occurring fault in field-op
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