Wire Exhibition 2024 Bulletin: The Key Role of Cable Switchgear in Efficient Operation
Switchgear is a finely assembled distribution device primarily designed to effectively control and protect cable circuits and equipment. Depending on the voltage level, it can be categorized into high-voltage (fixed type, draw-out type) and low-voltage (fixed type, drawer type) switchgear. Wire Exhibition 2024 has noted that various unexpected incidents can occur in daily operations, necessitating the use of monitoring systems to assist in monitoring the equipment and preventing accidents.
Wire Exhibition 2024 has learned that high-voltage cable switchgear mainly consists of busbar compartments, circuit breaker compartments, secondary control compartments, and feeder compartments, usually separated by steel plates. Low-voltage switchgear, on the other hand, is classified based on the installation method of its components.
The circuit breaker is the core of the switchgear, responsible for connecting and disconnecting the circuit, distributing electric power, and being able to withstand short-circuit currents and cut off fault lines. Switchgear is dominated by the circuit breaker, which, during operation, assembles related high and low voltage electrical components (including control, protection, and measuring devices), busbars, current-carrying conductors, insulators, etc., within a metal cabinet to receive and distribute electric power, as well as to control, protect, monitor, and measure circuits.
The operational temperature limits for switchgear range from a maximum of 40 degrees Celsius to a minimum of -5 degrees Celsius (down to -15 degrees Celsius in extremely cold regions). Excessive temperatures can reduce the conductivity of cable metals, increase resistance, cause surface oxidation, and shorten the lifespan of insulation parts. Conversely, excessively low temperatures may cause internal stress in insulation parts, leading to cracking.
The operational principles in cable system maintenance follow the "Five Prevention" procedures:
Preventing load splitting and isolating switches.
Preventing accidental disconnection or connection of circuit breakers, load switches, and contactors.
Preventing the connection of circuit breakers or load switches when the grounding switch is closed.
Preventing accidental grounding switch closure when the circuit is live.
Preventing unauthorized entry into live compartments.
These "Five Prevention" functions are crucial measures for power safety production, with their anti-error devices constantly being improved and perfected. High-voltage switchgear, a common type of metal-enclosed switchgear, plays a significant role in ensuring stable power supply and preventing power failures through its smooth operation.
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