Device for insulation monitoring and fault positioning of direct-current line

Abstract

The invention discloses a device for DC (direct-current) line insulation monitoring and fault positioning, and the device comprises a display card bottom plate, a cooling fan, and a cooling fin, the bottom of the display card bottom plate is provided with a mainboard connecting groove, the right side of the display card bottom plate is provided with an external power interface, and a temperature detection sensor is disposed below a DVI control chip. A DVI interface is arranged on the left side of the DVI control chip, the TVOUT interface is arranged below the DVI interface, a VGA interface isarranged below the TVOUT interface, and the cooling fin is installed on the right side of the DVI control chip. The evaporation refrigeration principle is used for cooling a computer display card, andthe problem that a computer cannot normally operate due to the high temperature is solved; the temperature of the computer display card can be detected, temperature information can be fed back to a frequency converter through the temperature detection sensor, the frequency converter changes the rotating speed of a motor according to the received information, and the motor drives the cooling fan to rotate for cooling.

Description

technical field [0001] The invention relates to a DC line system in the field of electrical engineering, in particular to a device for DC line insulation monitoring and fault location. Background technique [0002] In the DC line using IT grounding method, unipolar grounding will automatically generate a small grounding current, which generally will not affect personnel or equipment, and has high safety. However, if the single-point ground fault is not eliminated in time and effectively, human contact or ground faults occur in other poles in the system, which is the so-called "two-point ground fault", which may cause electric shock accidents or electrical fires, posing safety hazards and threatening Safety of personnel and equipment. For this reason, IT grounding systems generally require the use of insulation monitoring devices to monitor the insulation of lines and equipment in the system. In the case of abnormal ground insulation, alarms and other measures are taken to p...

AI Technical Summary

Problems solved by technology

However, when the system structure is relatively complex and there are many branches, the AC excitation generated by multiple insulation monitoring devices in different positions propagates and distributes in the system at the same time, mutual aliasing interference, insulation performance monitoring and fault line selection are difficult. may be affected, and may have a certain impact on the power quality of the system

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