10kv medium voltage metal-enclosed switchgear explosion-proof cabinet

Abstract

The invention provides a 10kV medium voltage metal-enclosed switchgear explosion-proof cabinet, wherein a lightning arrester, a protection fuse core and a voltage transformer of the cabinet are respectively installed in a novel cabinet with an independent closed compartment and are provided with an independent pressure relief channel. The technology can be used for the newly-increased explosion-proof cabinet structure transformation of existing busbar equipment cabinets in substations and power distribution rooms, and can also recommend the power grid as a standard program. The promotion of this technology increases the operational security of the medium voltage complete switchgear.

Description

technical field [0001] The invention relates to the field of medium-voltage power distribution equipment, and more specifically, to a flameproof cabinet for 10kV medium-voltage metal-enclosed switchgear. Background technique [0002] In the failure of medium-voltage switchgear, it is a common phenomenon that the primary components of the main circuit are damaged by overvoltage or electrical performance attenuation, especially the failure rate of voltage transformers and arresters remains high. Operational data show that overvoltage caused by atmospheric conditions such as lightning induction will use various lightning protection devices to eliminate or reduce the damage in order to prevent its damage. However, if the parameters and models of the lightning arrester are not well selected, it will not be able to fully protect the line system. In the long-term high-load state of the system, the zinc oxide arrester is gradually aging, and there is a danger of bursting due to heat...

AI Technical Summary

Problems solved by technology

Operational data show that overvoltage caused by atmospheric conditions such as lightning induction will use various lightning protection devices to eliminate or reduce the damage in order to prevent its damage. However, if the parameters and models of the lightning arrester are not well selected, it will not be able to fully protect the line system. In the long-term high-load state of the system, the zinc oxide arrester is gradually aging, and there is a danger of bursting due to heat generation; in the power system, the internal overvoltage has a high frequency and the most harmful is the ferromagnetic resonance overvoltage. When the system capacitance is large, it is easy to The formation of high-frequency resonance makes the voltage transformer coil rise to the maximum, and it is very easy to cause insulation breakdown of the voltage transformer protection device, resulting in subsequent short-circuit faults and even severe arcing accidents inside the equipment.

[0003] However, the structural design of the 10kV bus equipment cabinet in operation is not scientific, and the protection level of the internal arcing fault of the equipment is extremely low. In the compartment, when one of the components fails, an interlock reaction will occur, causing the fault to expand and causing a strong internal arcing accident of the equipment. If it is serious, it will cause damage to the busbar, resulting in a power outage of the system, which will have a huge impact

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