Ultralow frequency and oscillatory wave integrated partial-discharge-free cable performance detection device

A partial discharge cable and detection device technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of wasting time and resources, different tolerances, and high costs, reducing corona, increasing insulation distance, reducing effect of influence

Pending Publication Date: 2020-01-17
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In practical applications, the ultra-low frequency withstand voltage testing equipment and the cable oscillatory wave testing equipment are separate equipment, which are independently tested. The disadvantages of separate testing of the two sets of equipment are large size, large footprint, high cost, waste of time and resources, but due to Ultra-low frequency withstand voltage testing equipment and cable oscillatory wave testing equipment have different tolerances to partial discharge phenomena. There is no precedent for combining the two testing equipment to overcome this defect in the prior art

Method used

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  • Ultralow frequency and oscillatory wave integrated partial-discharge-free cable performance detection device
  • Ultralow frequency and oscillatory wave integrated partial-discharge-free cable performance detection device
  • Ultralow frequency and oscillatory wave integrated partial-discharge-free cable performance detection device

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specific Embodiment approach 1

[0030] Specific implementation mode one: the following combination figure 1 and figure 2 This embodiment is described. The ultra-low frequency and oscillatory wave two-in-one PD-free cable performance detection device in this embodiment includes an inductor L, a switch 1, a current source 2, a control system 3, a shielding box 4, a layer separator 8 and base 10;

[0031] The layer partition 8 is erected above the base 10 and divides the vertical space into upper and lower parts. The inductor L is installed on the layer partition 8 in the upper space, and the switch 1, current source 2, control system 3 and shielding box 4 are installed in the lower space. on the base 10;

[0032] The current source 2 and the control system 3 are stacked together, and the projection position on the base 10 coincides with the projection position of the inductance L on the base 10; the switch 1 is composed of a plurality of single switches stacked, and a shielding box 4 is arranged under the s...

specific Embodiment approach 2

[0050] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the inductance L is a cylinder hollowed out in the middle, and the edges of the cylinder are rounded.

[0051] Considering that the voltage is too high in this embodiment, the radius of curvature is increased as much as possible, and the edges of the cylinder are all rounded to prevent tip discharge.

specific Embodiment approach 3

[0052] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the inductance L adopts segmental continuous winding method, the segments are connected in series, the distance between segments is 2 cm, and the inductance is 0.3H-0.4H.

[0053] The inductor is wound with enamelled copper wire with a diameter of 1m, and epoxy resin is vacuum poured. In order to reduce the parasitic capacitance of the inductor, the segmented continuous winding method is adopted.

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Abstract

The invention discloses an ultralow frequency and oscillatory wave integrated partial-discharge-free cable performance detection device, belongs to the field of power cable test, and aims to design acable oscillatory wave partial discharge detection technology or an ultra-low frequency detection two-in-one device to realize cable partial discharge detection. The device comprises an inductor L, aswitch, a current source, a control system, a shielding box, a layer partition plate and a base, the layer partition plate is erected over the base and divides the vertical space into an upper part and a lower part, the inductor L is installed on the layer partition plate of the upper space, and the switch, the current source, the control system and the shielding box are installed on the base of the lower space. The current source and the control system are stacked together, and the projection position of the current source on the base coincides with that of the inductor L on the base. The switch is formed by stacking a plurality of single switches, the shielding box is arranged under the switch, and the projection position of the switch on the base is located in front of the projection position of the inductor L on the base; and the inductor L is electrically connected with the tested cable.

Description

technical field [0001] The invention belongs to the field of power cable testing and relates to equipment for testing cable performance. Background technique [0002] With the continuous development of the economy, the urban power infrastructure has continued to develop rapidly in recent years. High-voltage transmission cable lines are more and more used because of their safety, reliability, space-saving and city-beautifying features, which meet the development requirements of urbanization and modernization. The performance test of the cable includes the withstand voltage test and the internal defect test. Since the high-voltage cross-linked cable is tightly wrapped in layers, it is impossible to observe with the naked eye whether there are hidden defects such as cracks inside. Therefore, the performance test commonly used for existing cables The methods are ultra-low frequency withstand voltage detection technology (withstand voltage test) and cable oscillatory wave partia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 张德文朱学成张洪达朱广城冯海涛尚书磊梁建权许敏虎张朋张可心陈世玉
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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