Closed-type temperature control solid medium electrical resistivity measurement device

Abstract

The invention discloses a closed-type temperature control solid medium electrical resistivity measurement device, which belongs to the technical field of electrical measurement. The device is formed by that a test cavity is respectively connected with a direct-current power supply, a feedback-type temperature controller, a diaphragm vacuum pump, a magnetic drive pump and a Picoammeter, wherein the test cavity is formed into a coaxial hollow cylinder by an inner cavity and an outer cavity, and the upper end of the test cavity is sealed by a cover plate; the outer cavity is provided with a heat conduction oil circulation loop and is used for carrying out oil bath temperature control on the inner cavity by the heat conduction oil in a cycling way; an electrode and a test object are arranged in the inner cavity. According to the closed-type temperature control solid medium electrical resistivity measurement device, the inner cavity is subjected to even convection by a circulating oil bath so as to guarantee that temperatures of all positions in the inner cavity are consistent and are stable and constant within a range of 1DEG C. Since a form that a rubber gasket is externally pressed is adopted, a favorable vacuum degree in the inner cavity is guaranteed, an influence on an electrical resistivity measurement process by external environment humidity is minimized, and the closed-type temperature control solid medium electrical resistivity measurement device has the advantages of accurate measurement result, high reliability and easiness in operation.

Description

technical field [0001] The invention belongs to the technical field of electrical measurement, in particular to a closed temperature-controlled solid medium resistivity measurement device. Background technique [0002] With the rapid development of high-voltage DC transmission technology in my country, the insulation problems of DC equipment such as converter transformers, GIS (Gas Insulated Combined Electrical Appliances), and GIL (Gas Insulated Transmission Lines) have also attracted much attention. Under the action of DC voltage, the insulating material divides the voltage according to the resistivity, and the resistivity becomes the key parameter to characterize its insulating performance. [0003] "GB / T 1410-2006 Test Method for Volume Resistivity and Surface Resistivity of Solid Insulating Materials" specifies the principle, method and precautions of solid material resistivity measurement in detail. However, the national standard does not take into account the influen...

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Problems solved by technology

The relevant technologies that have been published so far do not consider the influence of the temperature and humidity of the external environment on the resistivity of the test product, and the measurement results are not accurate enough, which leads to the loss of reference significance for the evaluation of the electrical performance of insulating materials.

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