Peripherally loaded sensor for grounding grid round steel bar corrosion detection

Abstract

The invention discloses a peripherally loaded sensor for grounding grid round steel bar corrosion detection, belongs to the field of non-destructive testing, and particularly relates to an ultrasonic guided wave sensor using ultrasonic guided wave to detect corrosion of a grounding grid round steel bar in a power system. The sensor comprises 8-16 sensor units, wherein each sensor unit consists of a sensor housing (1), a slider (3) embedded inside the sensor housing (1), a pair of springs (2) between the sensor housing (1) and the slider (3), a pair of positioning pins (4) of the positioning slider (3), a piezoelectric sheet (6), a protective layer (7) used for supporting and protecting the piezoelectric sheet (6), a lead (5) of the positive pole and the negative pole of the piezoelectric sheet (6), a lining material (8) between the protective layer (7) and the slider (3) and a shaft pin (9) used for connecting the plurality of the sensor units. When in actual use, 8-16 sensor units are used for comprising the sensor to realize a loading manner that the sensor is uniformly distributed at the peripheral of the round steel bar in the circumference direction; and the sensor can be applied to non-destructive testing of commonly used model grounding grid steel bars with diameter of Phi 14-28 mm.

Description

technical field [0001] The utility model relates to a circumferential side loading sensor for detecting the corrosion of a round steel rod of a grounding grid, belonging to the field of non-destructive testing, and specifically relates to a special ultrasonic guided wave sensor for detecting corrosion of a round steel rod of a grounding grid in a power system by using an ultrasonic guided wave. Background technique [0002] The substation grounding grid is an important facility to ensure the safe and reliable operation of the power system. It not only provides a common reference potential for various electrical equipment in the substation, but also quickly discharges the fault current when the system fails. The substation grounding grid usually adopts a grid format. The materials used for the grounding grid laid in my country are mainly galvanized round steel rods or galvanized flat steel bars. The grid spacing is generally 6-12m, the buried depth is about 0.6-0.8m, and the a...

AI Technical Summary

Problems solved by technology

Although these methods can achieve excavation-free inspection of grounding grid faults, the real-time performance of grounding grid fault detection is not good. During the monitoring, professionals are required to adjust the measurement nodes in real time and perform multiple measurements based on the initial collected data. The generalization of this measurement method is limited

[0007] In 2005, Michaloudaki and other scholars published the article "Diagnosis of breaks in substitutions grounding grid by using the electromagnetic method" in "Magnetics", which used the method of electromagnetic field to detect the fracture position of the grounding grid conductor, but the corrosion degree of the unbroken grounding grid cannot be determined

At present, no one at home and abroad has conducted relevant research on piezoelectric sensor excitation ultrasonic detection of ground grid conductor corrosion

Images