Direct-current cable space charge measuring system

Abstract

The invention provides a direct-current cable space charge measuring system which comprises a space charge measuring unit, a heating unit, a temperature control unit, a high-voltage direct-current power source and a pulse generator. The space charge measuring unit, the heating unit and the temperature control unit are all arranged on a direct-current cable, and both the high-voltage direct-current power source and the pulse generator are connected with the direct-current cable through direct-current cable terminals. Through the coupled current heating direct-current cable, a temperature field which transmits heat from inside to inside and from a cable core to a cable insulation shell is realized, the actual working conditions of the direct-current cable are simulated, and a sensor is prevented from bearing high temperature through a heat insulation layer.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a DC cable space charge measurement system. Background technique [0002] The electroacoustic pulse method is a widely used space charge measurement method. The electroacoustic pulse method can observe the space charge accumulation behavior of DC cable insulation under high DC field strength. Since cables usually run at different temperatures, and the core of the cable will reach a temperature of 90°C when running at full load, it is of great practical significance to measure the space charge at different temperatures. [0003] The current space charge measurement system based on the electroacoustic pulse method usually uses a constant temperature source installed on the lower electrode to heat the cable by means of temperature field heat transfer. The invention patent with application number 201010216866.8 discloses a temperature-controllable PEA space charge...

AI Technical Summary

Problems solved by technology

This method of using a high temperature source to generate high temperature and using temperature field conduction heating, because the heating source is usually placed in the lower electrode, the sensor must withstand high temperature, and this heating method is heated from the outside to the inside, which is different from the actual cable from the inside to the outside. The heat transfer process is different, which affects the accuracy of the sensor and makes the measurement situation inconsistent with the actual situation, resulting in inaccurate measurement results

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