An intelligent non-electrical protection device and control method for an electric high-voltage switchgear

Abstract

The invention relates to an intelligent non-electricity protection device for a power high-voltage switch cabinet and a control method. The device comprises an infrared thermal imaging camera unit, a thermal imaging sensor unit, a display unit, an AD conversion unit, a control unit and a tripping circuit protection unit. The method comprises the steps as follows: the infrared thermal imaging camera unit obtains a running thermal imaging signal of equipment in the power high-voltage switch cabinet and transmits the running thermal imaging signal to the display unit and the AD conversion unit through the thermal imaging sensor unit respectively; and the control unit controls the tripping circuit protection unit according to the signal converted by the AC conversion unit. The intelligent non-electricity protection device can automatically control a tripping circuit of a breaker to act, cut off an incoming power supply of the breaker and prevent further deterioration and expansion of a serious overheat fault aiming at the condition that power high-voltage equipment in the power high-voltage switch cabinet is in the serious overheat fault, or a high-voltage wire, a wire clamp and a joint are in serious poor contact or the equipment is seriously affected with damp, so that safe operation of the power high-voltage switch cabinet and a power network is forcefully guaranteed.

Description

technical field [0001] The invention relates to a protection device for electric high-voltage equipment in an electric high-voltage switch cabinet, in particular to an intelligent non-electrical protection device and a control method for an electric high-voltage switch cabinet. Background technique [0002] The electric high-voltage equipment in the existing electric high-voltage switchgear will generate heat due to the action of electricity and magnetism during operation. For example, when the load increases sharply, the contact is seriously poor, the equipment is severely damp, or the equipment is seriously overheated, the temperature will be high. Rapid and sharp rise, especially when a sudden vicious overheating fault occurs, if the switching power supply is not cut off in time, it will cause a vicious accident in which the power high-voltage switchgear is burned and endangers the safe operation of the power grid. However, most of the existing protection devices for elec...

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Problems solved by technology

[0002] The electric high-voltage equipment in the existing electric high-voltage switchgear will generate heat due to the action of electricity and magnetism during operation. For example, when the load increases sharply, the contact is seriously poor, the equipment is severely damp, or the equipment is seriously overheated, the temperature will be high. Rapid and sharp rise, especially when a sudden vicious overheating fault occurs, if the switching power supply is not cut off in time, it will cause a vicious accident in which the power high-voltage switch cabinet is burned and endangers the safe operation of the power grid

However, most of the existing protection devices for electric high-voltage switchgears involve changes in electric and magnetic power signals. When the high-voltage equipment running in the high-voltage switchgear has an overheating fault, or is affected by moisture, or the equipment connector, wiring is loose, or the temperature rises due to poor contact, etc., the protection by the change of the electrical and magnetic power signals of the equipment is sometimes insensitive. Unreliable, the traditional method can only take power outages, measure the contact resistance of high-voltage equipment and joints to determine whether there is a heating fault during operation of the equipment, for outdoor high-voltage equipment, infrared temperature measurement is often used for non-contact temperature measurement, but power The high-voltage switchgear is closed and sealed, and the equipment and wiring in the cabinet have high-voltage electricity. The traditional contact-type temperature sensing and temperature measuring probes cannot directly contact the conductor surface with high-voltage electricity. Therefore, the traditional power high-voltage switchgear cannot Even if a temperature measuring probe wrapped in insulating material is used to touch the surface of a high-voltage electrical conductor, the heat conduction time will be seriously delayed because the insulating material is a poor conductor, resulting in temperature measurement or temperature rise. The protective effect is greatly reduced

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