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Shielding voltage dividing device

A low-voltage, internal high-voltage technology, applied in the direction of voltage divider, etc., can solve the problems of small diameter, high height of high-voltage resistance, large ground stray capacitance, etc.

Pending Publication Date: 2021-11-30
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unit is the external electric field of the voltage equalizing resistor divider. The higher the voltage, the larger the outer diameter of the resistor divider. Therefore, when the rated voltage of the resistor divider exceeds 1000kV, a segmented resistor divider is generally used. The high-voltage resistor runs through the entire height of the voltage divider, and its diameter is small. The limitation of the voltage level is mainly the insulation of the resistance wire itself. The disadvantage is that the height of the high-voltage resistor is high, and the stray capacitance to the ground is large. Stray capacitance compensation, but the high-frequency response characteristics cannot meet the standard requirements

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Embodiment 1

[0044] The embodiment of the first aspect of the present invention provides a schematic circuit diagram of a shielding voltage dividing device.

[0045] refer to figure 1 . The shielded voltage divider consists of a damping resistor R d , high voltage resistors, low voltage resistors and measuring equipment.

[0046] Among them, high voltage resistors can be divided into internal high voltage resistors R 11 and the external high voltage resistor R 12 ; Low voltage resistance can be divided into internal low voltage resistance R 21 and the external low voltage resistor R 22 . Inner high voltage resistor R 11 and the internal low voltage resistor R 21 The conversion branch is formed in series, and the external high-voltage resistor R 12 and the external low voltage resistor R 22 Connected in series to form a shielded branch. In traditional equipment, there is only the structure of the conversion branch. By setting the shielding branch, the high-frequency response char...

Embodiment 2

[0049] refer to figure 2 , according to some preferred embodiments of the present application, the shielding voltage dividing device described in the present application further includes: a first matching resistor R M1 and the second matching resistor R M2 . Among them, the first matching resistor R M1 Connected to the inner core wire of the signal output terminal; the second matching resistor R M2 Set at the end of the coaxial cable, one end is connected to the inner core wire of the coaxial cable, and the other end is connected to the mesh conductive layer of the coaxial cable.

[0050] The first matching resistor R M1 The sum of the resistance value of the inner layer and the low-voltage resistance of the inner layer is equal to the characteristic impedance of the radio frequency coaxial cable; this structure can reduce the waveform distortion caused by the refraction and reflection of the traveling wave transmitted inside the coaxial cable.

[0051] The second matchi...

Embodiment 3

[0053] refer to image 3 , the embodiment of the third aspect of the present application provides a specific implementation manner of a shielding voltage divider.

[0054] The equipment includes an upper flange 100, an epoxy glass fiber reinforced plastic outer cylinder 200, a lower flange 300, an inner high voltage resistor 401, an outer high voltage resistor 402, an insulating inner tube 501, an insulating outer tube 502, a lower metal connector 503, a first matching Resistor 600, inner low voltage resistor 701, outer low voltage resistor 702, low voltage metal shell 800, cable connector 900.

[0055] The upper flange 100, the epoxy glass fiber reinforced plastic outer cylinder 200 and the lower flange 300 constitute the insulating shell of the device, and the lower flange 300 is grounded. The lower flange 300 is grounded to facilitate the connection of lines, and the function of external insulation is undertaken by the epoxy glass fiber reinforced plastic outer cylinder 20...

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Abstract

The invention discloses a shielding voltage dividing device which comprises a damping resistor, high-voltage resistors and low-voltage resistors, the high-voltage resistors are divided into an inner high-voltage resistor and an outer high-voltage resistor, the low-voltage resistors are also divided into an inner low-voltage resistor and an outer low-voltage resistor, and the outer high-voltage resistor and the outer low-voltage resistor are connected in series to form a shielding branch. According to the structure, the high-frequency response characteristic of a measurement path is improved. Besides, a first matched resistor and a second matched resistor are additionally arranged on the coaxial cable of the measuring equipment, and the first matched resistor and the second matched resistor are arranged at the two ends of the coaxial cable respectively and used for reducing waveform distortion caused by refraction and reflection of traveling waves transmitted in the cable.

Description

technical field [0001] The invention relates to the technical field of high voltage measurement, in particular to a shielding voltage dividing device. Background technique [0002] The impulse voltage measuring device is the key measuring equipment for the impulse voltage withstand test of electrical equipment. Its measurement accuracy directly affects the safety and economy of electrical equipment, and the effective method to ensure the accuracy and consistency of the value is the traceability of the value. Traceability of measurement results to national or international standards through an unbroken chain of specified uncertainties. In recent years, with the continuous development of measurement technology and the continuous improvement of quality management system, and the export volume of my country's measurement equipment is increasing day by day, various enterprises and research institutes pay more attention to the traceability of the peak value and time parameters of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/04
CPCG01R15/04
Inventor 龙兆芝周峰李文婷殷小东刘少波范佳威胡康敏涂琛李明刘柯耿志辉宗贤伟
Owner CHINA ELECTRIC POWER RES INST