Detection method of arcing time of switchgear

Abstract

The invention relates to a detection device and a detection method for the arcing time of switchgear, and belongs to the technical field of power generation, transformation or distribution switchgear. The device includes a power supply, a stroke measurement module, a current measurement module, and a data acquisition and analysis module; the method includes: 1) the switchgear executes an operation command, the data acquisition and analysis module measures the voltage signal of the switchgear and the voltage signal output by the stroke measurement module, Calculate the opening distance of the switchgear according to the voltage signal and stroke signal of the switchgear; 2) The switchgear executes the operation command, the data acquisition and analysis module measures the voltage signal output by the current measurement module and the voltage signal output by the stroke measurement module, and calculates the corresponding Loop current signal and travel signal; 3) Calculate the arcing time of the switchgear according to the opening distance in step 1), the loop current signal and travel signal in step 2). The invention has simple operation, high measuring precision and is beneficial to the evaluation of the electric life of the switchgear.

Description

technical field [0001] The invention belongs to the technical field of power generation, transformation or distribution switchgear, and in particular relates to a detection method for arcing time of switchgear. Background technique [0002] When the switchgear is closed, pre-breakdown may occur between the dynamic and static contacts, and the time between the start of the arc burning and the contact of the dynamic and static contacts is the closing arcing time. When the switchgear is disconnected, an arc will be generated between the moving and static contacts, and the time between the start of the arc burning (arcing) and the extinguishing of the arc (arc extinguishing) is the opening arcing time. Arcing time is one of the main factors affecting the electrical life of high voltage switchgear. According to the current waveform, the three-phase closing arcing time and opening arcing time can be easily obtained. Therefore, the time for the arc to burn between the contacts ca...

AI Technical Summary

Problems solved by technology

However, this method has two disadvantages: one is that the electromagnetic interference on site is serious, and the measurement accuracy is low; the other is that this method can only measure the arcing time of the first split phase of the contact, and in actual application, it can only be assumed that the three phases start arcing at the same time. The error of the last two phases is at least 6.67ms

This method is accurate in measurement, but the fracture voltage of switchgear is usually not measured in field applications, especially high-voltage switchgear, so this method is mostly used in laboratory research, and the field is not practical

[0008] In summary, the current detection method of arcing time of switchgear is affected by the dispersion of operating time and on-site electromagnetic interference, and has disadvantages such as low measurement accuracy, high cost, or not suitable for on-site measurement.

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