Device and method for testing electric strength of dielectric fluid under inhomogeneous field

A technology of non-uniform field and electric strength, applied in the direction of testing dielectric strength, etc., can solve the problem of not finding non-uniform electric field liquid and so on

Inactive Publication Date: 2015-02-18
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no experimental device that systematically realizes the research on the breakdown characteristics of different types of non-uniform electric field liquids, and realizes the photoelectric information collection, analysis, and processing of the discharge process and the microscopic visibility of the evolution of the discharge channel.

Method used

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  • Device and method for testing electric strength of dielectric fluid under inhomogeneous field
  • Device and method for testing electric strength of dielectric fluid under inhomogeneous field
  • Device and method for testing electric strength of dielectric fluid under inhomogeneous field

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specific Embodiment approach 1

[0018] Specific implementation mode one: the following combination figure 1 and figure 2 Describe the present embodiment, the test device for the dielectric strength of the liquid dielectric under the non-uniform field described in the present embodiment, which includes a reaction vessel 1, the interior of the reaction vessel 1 is filled with a liquid dielectric 2, and the interior of the reaction vessel 1 is relatively provided with a needle-type high voltage Electrode 3 and ground electrode 4, the optical input end of optical fiber 5 is arranged at the gap between the discharge end of needle-type high-voltage electrode 3 and the arc receiving end of ground electrode 4, and the optical output end of optical fiber 5 is connected to the optical signal input end of photomultiplier tube 7 , the electrical signal output end of the photomultiplier tube 7 is connected to the display signal input end of the oscilloscope 8; the electrical signal output end of the photomultiplier tube...

specific Embodiment approach 2

[0025] Specific implementation mode two: the following combination image 3 To illustrate this embodiment, according to the method of the test device for the dielectric strength of a liquid dielectric under a non-uniform field described in Embodiment 1, the method includes the following steps:

[0026] Step 1: Turn on the high-voltage DC power supply 6, and the needle-type high-voltage electrode 3 discharges to the ground electrode 4 to form a non-uniform electric field;

[0027] Step 2, the light generated during the discharge process is received by the optical fiber 5, and the optical signal is converted into an electrical signal by the photomultiplier tube 7, and displayed on the oscilloscope 8;

[0028] Step 3, the controller 9 processes the received electrical signal, establishes a physical discharge model of the liquid dielectric 2, uses the finite element method to numerically solve the fluid dynamics model, and utilizes the inherent parameters of the liquid dielectric ...

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Abstract

The invention discloses a device and method for testing the electric strength of dielectric fluid under an inhomogeneous field, and belongs to the interdiscipline field of the high voltage technology and fluid mechanics. The device and method aim to solve the research problem that the breakdown characteristics of fluid under various sorts of inhomogeneous electric fields cannot be achieved through an existing technology. The device comprises a reaction vessel, the dielectric fluid, a pin type high voltage electrode, a grounding electrode, an optical fiber, a high voltage DC electric source, a photomultiplier, an oscilloscope and a controller. The method includes the steps that the pin type high voltage electrode is started to conduct discharging to the grounding electrode, so that an inhomogeneous electric field is formed; light generated in the discharging process is received by the optical fiber and is displayed on the oscilloscope; the controller processes a received electric signal, a dielectric liquid discharging physical model is established, a finite element method is used for conducting numerical solution on a fluid dynamic model, and corresponding assignment calculation is conducted on continuity equations of positive ions, negative ions and electrons; the change rule of space charges and electric field intensity in the discharging process of the dielectric fluid is expressed from the micro level.

Description

technical field [0001] The invention relates to an electric strength testing technology, which belongs to the interdisciplinary field of high voltage technology and fluid mechanics. Background technique [0002] With the increase of power system voltage, it is urgent to develop new dielectrics to meet the needs of power equipment insulation. At present, most of the power equipment such as power capacitors and transformers still use liquid dielectrics to enhance the electrical strength of the insulation system. Ensure the safety and reliability of power generation, transmission and consumption. Therefore, the in-depth exploration of liquid dielectric discharge phenomena can not only provide technical support and theoretical basis for the structural design of power equipment, but also expand the new field of liquid dielectric applications. [0003] Many scholars have done a lot of research work on the mechanism of liquid dielectric breakdown, but due to the complexity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 郑殿春赵大伟陈亭杨仁旭
Owner HARBIN UNIV OF SCI & TECH
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