Combined space charge-thermally stimulated current time sharing measurement device and method thereof

Abstract

The invention relates to a combined space charge-thermally stimulated current time sharing measurement device and a method thereof. The device comprises a pulse module, a DC high voltage module, an electrode module and a data acquisition module, wherein the pulse module provides an excitation source for the electrode module and is used for converting a space charge signal into a vibration signal; the DC high voltage module provides an DC electric field for the electrode module and is used for polarizing a to-be-tested sample; the electrode module is connected with the pulse module and the DC high voltage module, temperature of the to-be-tested sample is controlled, and the space charge signal and the thermally stimulated current are further led out; the space charge signal and the thermally stimulated current of the electrode module are received by the data acquisition module and are further stored and processed. The measurement device is advantaged in that a four-electrode structure having an upper electrode, a lower electrode, a protection electrode and a current measurement electrode, and a single-pole double-throw switch are employed to carry out time sharing measurement for the space charge and the thermally stimulated current of one same to-be-tested sample, check and balance of liquid nitrogen and an electric heating loop are realized to control temperature of the to-be-tested sample, mutual interference and temperature control between two measurement modes can be solved, and combined measurement in a wide temperature scope is realized.

Description

technical field [0001] The invention relates to a technique in the field of physical measurement of solid media, in particular to a joint time-sharing measurement device and method for space charge-thermal stimulation current. Background technique [0002] Solid dielectric materials are widely used in power systems and other industries. For example, polyethylene insulated cables are widely used in power transmission in AC and DC systems due to their light structure, high operating temperature and environmental friendliness. However, under a high-voltage direct current electric field, polymers are very easy to accumulate space charges, resulting in electric field distortion, accompanied by problems such as thermal electron emission and electromechanical energy storage and release, which will accelerate insulation degradation and greatly reduce its service life. Therefore, the space charge measurement of solid media has always been an effective means to study the DC characteri...

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Problems solved by technology

[0008] Aiming at the defects of the prior art, such as the interference caused by the charge discharge of the piezoelectric sensor and the inaccurate measurement results caused by the temperature change, the present invention proposes a combined time-sharing measurement device and method for space charge-thermal stimulation current, using The four-electrode structure of the upper electrode, the lower electrode, the guard electrode and the current measurement electrode and the single-pole double-throw switch perform time-sharing measurement of the space charge and thermal stimulation current of the same sample to be tested, and overcome the mutual interference and temperature between the two measurements. control, reliable

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