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Impulse characteristic simulation test device and method of grounding device

A grounding device and simulation test technology, which is applied in the direction of test ship construction and dielectric strength testing, can solve the problems of not being able to obtain the impact characteristics of the grounding device, not being able to better simulate the soil discharge process, and the amplitude of the impact current is small

Inactive Publication Date: 2011-12-28
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of the above two patents are: ① only the impact grounding impedance of the grounding device can be obtained, and other impact characteristics of the grounding device, such as the distribution of impact dispersion, etc.; The amplitude of the current is small, and it cannot simulate the soil discharge process when the actual lightning current spreads to the surrounding soil through the grounding device.
Therefore, it is impossible to obtain comprehensive and accurate impact characteristics of the grounding device

Method used

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  • Impulse characteristic simulation test device and method of grounding device
  • Impulse characteristic simulation test device and method of grounding device
  • Impulse characteristic simulation test device and method of grounding device

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Such as figure 1 ～ As shown in 5, a simulation test device for the impulse characteristics of a grounding device mainly includes an impulse current generator 1, a hemispherical test tank 13, an analog grounding device 14, a core-through current sensor 15, an impulse voltage divider 11, a broadband digital Oscilloscope 12 and coaxial shielded cable 16 and so on.

[0056] The impulse current generator 1 is a commercially available module, and the instantaneous amplitude is 8 ～ 200kA adjustable, wave front time 1.2 ～ 20 variable, wave tail time is 20 ～ 1000 Variable double exponential current wave. Impulse current generator 1 mainly includes: intelligent control system 2, voltage regulator 3, step-up transformer 4, silicon stack 5, wave modulation resistor 6, wave modulation inductor 7, pulse capacitor bank 8, pneumatic ignition ball gap 9, air compression Machine 10. The intelligent control system 2 is respectively connected with the voltage regulator 3 and the ...

Embodiment 2

[0064] A simulation test device for the impact characteristics of a grounding device is the same as in Embodiment 1, wherein: the pulse capacitor bank 8 is composed of 12 pulse capacitors of 30 μF connected in parallel, and every 3 pulse capacitors are connected in parallel to form a group. The hemispherical test tank 13 is a hemispherical shell with a diameter of 5 m and a steel plate whose outer wall is 2 mm thick. The non-magnetic skeleton 25 has an inner diameter of 5 cm, an outer diameter of 6 cm, and a cross-sectional diameter of 2 cm. The copper coil 27 is evenly wound on the circular non-magnetic skeleton 25 by a copper enameled wire with a wire diameter of 1.12mm, and the number of turns is 700 turns. A polymer insulating shell 26 with a thickness of 1 cm is cast on the surface of the core-through current sensor 15 .

Embodiment 3

[0066] A simulation test device for the impact characteristics of a grounding device is the same as in Embodiment 1, wherein: the pulse capacitor bank 8 is composed of 20 pulse capacitors of 100 μF connected in parallel, wherein every 2 pulse capacitors are connected in parallel to form a group. The hemispherical test tank 13 is a hemispherical shell with a diameter of 10 m and an outer wall made of a steel plate with a thickness of 3 mm. The non-magnetic skeleton 25 has an inner diameter of 10 cm, an outer diameter of 12 cm, and a cross-sectional diameter of 2 cm. The copper coil 27 is evenly wound on the circular non-magnetic skeleton 25 by a copper enameled wire with a wire diameter of 1.67mm, and the number of turns is 1000 turns. The surface of the core-through current sensor 15 is cast with a polymer insulating shell 26 with a thickness of 2 cm. The power supply of the broadband digital oscilloscope 12 is an offline UPS.

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Abstract

The invention provides an impact characteristic simulation test apparatus of an earthing device and a method thereof, and belongs to the simulation test field of the earthing device. The impact characteristic simulation test apparatus comprises an impact current generator, a semispherical test bath, a simulation earthing device, a core penetration type current sensor, an impact voltage divider, a wideband digital oscilloscope, a coaxial shielding cable and the like. According to the method, by employing the apparatus in the invention, an impact simulation test of the earthing device is carried out. According to the invention, a soil discharge process that a real lightning current goes through the earthing device and flows to surrounding soil is simulated accurately, and an impact earthing impedance of the earthing device and an impact flow rule of the earthing device are measured. The apparatus has the characteristics of high reliability, good security, low test cost and the like. The apparatus and the method can be widely applied to measurement of the impact impedance and the impact flow rule of the earthing device under an effect of a heavy impact current, and are especially suitable for measurement of the impact impedance and the impact flow rule of the earthing device under an effect of a lightning current.

Description

technical field [0001] The invention belongs to the technical field of simulation tests of grounding devices, and in particular relates to an impact characteristic simulation test device and a simulation test method of grounding devices. Background technique [0002] Studying the impact characteristics of the grounding device is of great significance to the safe and reliable operation of the power system. Measuring the impact characteristics of the grounding device by means of tests has always been an important means of grounding research. The simulation test using the impact characteristics of the grounding device can be accurate and reliable. The impact characteristics of the grounding device can be accurately measured, so as to guide the reasonable design and construction of the grounding device in the power system, and provide guarantee for the safe operation of the power system. [0003] Existing test devices and methods for the impact characteristics of grounding devic...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/16
Inventor 袁涛司马文霞杨庆雷超平廖瑞金杜林孙才新
Owner CHONGQING UNIV
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