A magnetic steel bar for lightning current measurement and its production process

Abstract

The invention provides a magnetic link for measuring lightning current and a production process of the magnetic link. The magnetic link is composed of a functional material and an auxiliary material. The functional material comprises LNG9, LNG10 and ferrite powder, and the auxiliary material comprises a high-valence chromium solution, epoxy powder and zinc stearate. The production process of the magnetic link comprises the following steps that 1, LNG9 and LNG 10 are smashed and ground to be prepared into powder of 100 mesh; 2, the LNG9, the LNG10, the ferrite powder and zinc stearate are prepared in proportion, and powder mixing is carried out; 3, the even powder obtained in the step 2 is placed in a chromium trioxide solution for passivating treatment; 4, the powder obtained after passivating treatment is weighed for compression moulding; 5, the formed magnetic link is baked and shaped for 120 min to 250 min at the temperature of 150 DEG C to 210 DEG C; 6, the surface of the magnetic link obtained in the step 5 is wrapped by a layer of epoxy powder solution, and standing and airing are carried out. The magnetic link is wider in measuring range for measuring the lightning current, better in linearity and smaller in measuring error, and the production process is simple, easy to achieve and suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to a power grid safety and protection application device in a power system, in particular to a magnetic steel rod used for lightning current measurement and a production process thereof. Background technique [0002] The high-voltage transmission lines in the power system have high erection heights, wide coverage, complex terrain, and are vulnerable to lightning strikes. It is urgent to do a good job in lightning protection for high-voltage lines. Lightning monitoring is the focus of lightning protection for high-voltage lines. The main content includes the detection of the lightning current amplitude when the line is struck by lightning and the discrimination of the type of line lightning fault. Through the measurement of the lightning current amplitude, the distribution law of the lightning current amplitude of the lightning strike line can be obtained, and the actual lightning withstand level of the line can be analyzed and calculat...

AI Technical Summary

Problems solved by technology

The lightning warning is realized through the lightning positioning system. Although the lightning can be well positioned, the measurement error of the lightning current is still uncertain.

There is also a Rogowski coil installed on the lightning rod of the tower to monitor the lightning current at the top of the tower, but because the cost of the Rogowski coil is relatively high, and a large number of lightning monitoring devices need to be arranged, the cost is relatively high

In addition, a large number of magnetic steel recorders (magnetic steel rods) are installed in the power system to monitor the amplitude of the lightning current. This method is simple and easy, and the cost is low, but the measurement error of the lightning current is relatively large, and the measurement range is limited. Too small to measure large-amplitude lightning currents and is easily affected by lightning waveforms

[0004] At present, the production of magnetic steel rods mostly uses magnetic materials such as ferrite and nickel steel, which are prepared by molding processes such as casting, strip cutting, powder melting and pressing, among which the magnetic steel rods with the best magnetic properties are made of Alnisi alloy powder ( 15% of aluminum, 24% of nickel, 4% of steel, 57% of iron) and epoxy powder are fused and pressed, but the obtained magnetic steel rod has the problems of small eddy current loss, large coercive force and difficulty in saturation

Images