Volume resistivity test system under high temperature and high voltage

Abstract

The invention discloses a volume resistivity test system under a high temperature and a high voltage. The system comprises a direct-current high-voltage generator, a high resistance meter, a temperature control shielding box, and a test electrode in the temperature control shielding box, wherein the test electrode comprises two electrode plates placed in parallel with each other; a sample accommodating gap is disposed between the two electrode plates; a positive electrode of a direct-current output terminal of the direct-current high-voltage generator is connected to one of the electrode plates of the test electrode through a high-voltage lead; and the other electrode plate is connected to a test terminal of the high resistance meter; a protective resistor is connected in series to the high-voltage lead; a protection ring is disposed on an outer side of the electrode plate connected to the test terminal of the high resistance meter in an encircling manner; the temperature control shielding box comprises a metal shell and a temperature control module capable of changing the temperature in a box body; and a negative electrode of the direct-current output terminal of the direct-current high-voltage generator, the other electrode plate of the test electrode, the metal shell of the temperature control shielding box and a ground terminal of the high resistance meter are connected andgrounded. The volume resistivity test system under the high temperature and the high voltage disclosed by the invention can adapt to volume resistance measurement of an insulated sample under the high voltage, meanwhile the test environment temperature range is broadened, and the problems of single test temperature and noise signal interference are solved.

Description

technical field [0001] The invention relates to the technical field of electrical insulation testing, in particular to a volume resistivity testing system for insulating materials under high temperature and high pressure. Background technique [0002] Polymers have become indispensable materials in the electrical industry because of their excellent electrical properties, such as high resistivity, low dielectric loss, and high electrical breakdown strength. It is usually used to insulate the components of the electrical system from each other and from the ground. It is hoped that the material has as high a volume resistivity as possible. The volume resistivity of insulating materials often changes with the ambient temperature and applied electric field. For example, the cross-linked polyethylene used in the insulation layer of high-voltage DC cables has a very obvious change in volume resistivity with temperature and electric field, sometimes reaching several orders of magnit...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a volume resistivity test system under high temperature and high pressure, which can solve the problem of single test temperature and noise signal interference, can adapt to the volume resistance measurement of insulating samples under high temperature and high pressure, widen the test temperature range, and improve the accuracy of test results sex

Images