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Voltage check device

A technology of voltage detection and voltage, which is applied in the direction of measuring device, switchgear, switchgear setting, etc., can solve the problems of insulation damage and insulation resistance reduction, and achieve the effect of reliable suppression measures and prevention of insulation resistance reduction

Inactive Publication Date: 2006-11-08
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are problems such as insulation resistance reduction and insulation damage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] Hereinafter, a voltage detection device for gas-insulated equipment according to Embodiment 1 of the present invention will be described. figure 1 It is a schematic configuration diagram of the voltage detection device according to Embodiment 1 of the present invention.

[0039] The grounded metal container 1, which is a conductive container composed of conductive members, is filled with an insulating gas such as SF6 gas in a cylindrical casing constituting a gas insulated device such as a gas insulated switch.

[0040] A bus bar 2 , which is a high-voltage conductor to be detected, is arranged coaxially inside the grounded metal container 1 . The cylindrical intermediate electrode and the grounded metal container 1 are arranged coaxially between the grounded metal container 1 and the bus bar 2, and the grounded metal container 1 and the bus bar 2 are electrically insulated and installed. The intermediate electrode 3 is insulated and supported on the inner surface of ...

Embodiment approach 2

[0097] In the voltage detection device of the first embodiment described above, the resistor 21 is provided in the outer case 11 that accommodates the second capacitor 10 and the voltage sensor 12, but the configuration of the voltage detection device may also be as follows: Figure 10 . shown. That is, the resistor 21 can be inserted into the middle of the ground wire 22 connecting the outer box 11 and the grounded metal container 1 to be inserted into the conductive path leading to the grounded metal container 1 from the low voltage side of the second capacitor 10 . In addition, a lead wire 30 for grounding that is electrically connected to the outer case 11 and the ground line is provided. the rest of the composition and figure 1 The voltage detection device shown is the same.

[0098] Figure 11 express Figure 10 The equivalent circuit diagram of the voltage detection device is shown. Figure 11 C1~C4, L1~L4, R1, and R2 in the above-mentioned embodiment 1 figure ...

Embodiment approach 3

[0114] Hereinafter, the resistance value of the resonance suppressing resistor 21 used in the first and second embodiments described above will be described.

[0115] Generally, when the resistance value R is large, Q indicating the sensitivity of resonance occurring in a closed circuit can be expressed by the following equation.

[0116] Q=1 / R×√(L / C) …(6)

[0117] combine figure 2 The equivalent circuit becomes

[0118] L=L2+L3+L4, C=1 / (1 / C2+1 / C3), R=R2...(7)

[0119] Since the larger the Q, the larger the resonance, so the larger the resistance value of the resistor 21, the more the resonance in the closed circuit (1) can be suppressed.

[0120] However, if using figure 2 As described above, the voltage sharing ratio (voltage division ratio) is determined by the ratio of the impedance of C1 in the voltage detection device to the total impedance of the low-voltage side of C1. The larger the resistance value of the resistor 21, the better the effect of suppressing reson...

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Abstract

The present invention discloses a voltage detection device that suppresses the resonance phenomenon in a closed circuit including the capacitance between an intermediate electrode and a grounded metal container, and a capacitor for voltage detection, and prevents overshoots from occurring in each part of the closed circuit. Voltage. Its structure is made: a first capacitor composed of a grounded metal container (1) separated from the bus bar (2) by a predetermined distance and coaxially formed into a cylindrical intermediate electrode (3) and the grounded metal container (1); A voltage sensor (12) is applied to a voltage sensor (12) to detect the voltage of the bus (2) by applying the divided voltage between the second capacitor (10) for voltage detection. And the resistance (21) is arranged in the closed circuit (1) including the capacitance between the intermediate electrode (3) and the grounded metal container (1) and the second capacitor, and suppresses the resonance phenomenon in the closed circuit (1).

Description

technical field [0001] The invention relates to a voltage detection device, in particular to a voltage detection device applied to gas insulated equipment such as a gas insulated switchgear. Background technique [0002] Existing voltage detection devices used in gas-insulated equipment are shown below. Figure 22 It is a cross-sectional view showing the configuration of a conventional voltage detection device. [0003] like Figure 22 As shown, a grounded metal container 1 as a conductive container having a conductive member constitutes a cylindrical casing of a gas insulated device such as a gas insulated switch. A bus bar 2 as a high-voltage conductor is arranged coaxially inside the grounded metal container 1 . The cylindrical intermediate electrode 3 and the grounded metal container 1 are arranged coaxially between the grounded metal container 1 and the bus bar 2 , and installed so as to be electrically insulated from the grounded metal container 1 and the bus bar 2 , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/06G01R19/00
CPCH02B13/0356
Inventor 宫下信井波洁堀之内雄作羽马洋之伊东启太石垣一三伊藤文雄
Owner MITSUBISHI ELECTRIC CORP
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