Eight-terminal voltammetry measuring method of direct current resistance

Abstract

The invention provides an eight-terminal voltammetry measuring method of direct current resistance, particularly comprising the following steps: connecting two measuring elements respectively at two ends of a measured power device, wherein the internal resistances of the four measuring elements are respectively R1, R2, R3 and R4, and the direct current resistance of the measured power device is Rs; respectively inputting direct current to two different measuring elements and sampling voltage therethrough, and working out six groups of resistances which respectively are Ru, Rv, Rw, Rx, Ry and Rz; getting the following equations according to the current route: Ru = R1 + R3, Rv = R2 + R4, Rw = R1 + Rs + R2, Rx = R1 + Rs + R4, Ry = R2 + Rs + R3, Rz = R3 + Rs + R4; gathering the equations to get that Rs = [Rw + Rx + Ry + Rz - 2(Ru + Rv)] / 4.The method has the advantages of ingenious design, simple operation step, convenient measurement and accurate measuring data.

Description

technical field [0001] The invention relates to a method for measuring direct current resistance, in particular to an eight-terminal button voltammetry method for measuring direct current resistance. Background technique [0002] Measuring DC resistance is a basic test item that many electrical equipment needs to carry out, such as power transformers, reactors, discharge coils, transmission lines, diversion contacts of many electrical equipment, etc.; the main purpose of measuring DC resistance is to check electrical equipment The welding quality of the connecting joints, whether there is a short circuit between the windings in the equipment with windings, whether the tap position of the equipment with a voltage tap changer is in good contact and whether the actual position of the tap changer is consistent with the indicated position, and whether the multi-strand wires are connected Check whether there are any broken strands in the winding cable. Therefore, DC resistance me...

AI Technical Summary

Problems solved by technology

[0007] However, in the process of measuring DC resistance by traditional four-terminal button voltammetry, its inherent error will have a great influence on the measurement data; In the process, the majority of test personnel have to do a lot of preparatory work in advance, such as removing all clamps and fastening bolts connected to the test object, grinding the measurement contact surface, increasing the contact area and contact pressure between the measuring element and the test object, etc. Measures, and then repeated measurements to minimize this error; these measures are implemented on site, because it often takes a lot of time, manpower, and material resources to remove and connect equipment leads, and if the staff is not careful in their work, It will also leave potential safety hazards in the lead connection parts of the equipment, and the effect is not very ideal; especially in the case of urgent repair work with relatively tight time requirements, when DC resistance measurement is required, the measurement work often makes mistakes because of the large measurement error , which in turn affects the correctness of the decision-making of the superior department;

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