High-frequency voltage and superposed power-frequency current type cable accessory aging test device

Abstract

The invention discloses a high-frequency voltage and superposed power-frequency current type cable accessory aging test device and relates to the technical field of power cable aging and detection techniques thereof. The cable accessory aging test device comprises a high-frequency test voltage generating unit, a high-frequency voltage test loop unit, a power-frequency load current simulation and generation unit and an insulating information monitoring unit. The high-frequency test voltage generating unit generates a high-frequency strong electrical field, and then an XLPE cable accessory is subjected to the high-frequency electrical aging treatment. The power-frequency load current simulation and generation unit generates heat in the high-frequency voltage test loop unit, and then the XLPE cable accessory is subjected to the thermal aging treatment. The above two units work simultaneously to simulate the actual operating condition of the XLPE cable accessory. The insulating information monitoring unit adopts the non-invasive monitoring method, so that the state monitoring for the insulating characteristic parameters of the medium-voltage XLPE cable accessory is realized.

Description

technical field [0001] The invention belongs to the technical field of power cable aging and detection thereof, and in particular relates to a cable accessory aging test device in which high-frequency voltage is superimposed on power frequency current. Background technique [0002] In recent years, with the continuous expansion of power system capacity, the complexity of power user equipment has increased, especially the proportion of some large-capacity nonlinear loads in the total system load has continued to increase, and the harmonic problem of power systems has become increasingly prominent . Under the action of harmonics containing many high-frequency components, the insulation problem of power equipment becomes more serious, leading to abnormal aging and damage of equipment prematurely. At present, there are a large number of medium-voltage XLPE cable terminals in operation in the power grid, and cable terminal accidents are the main cause of cable line tripping acci...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of the output capacity of the high-frequency excitation transformer, it is difficult for the high-frequency excitation transformer to simultaneously output the load current that can simulate the actual operating conditions when providing high-frequency and high voltage during the aging test

At present, the design ideas of high-frequency electrical aging test devices at home and abroad mostly use high-frequency voltage generators combined with light, external heat and other methods, and it is difficult to realize the insulation accelerated aging test of cable accessories under the combined action of high-frequency strong electric field and power frequency load current.

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