Ground wave partial discharge tester calibration device

Abstract

The utility model discloses a calibration device for a ground electric wave partial discharge tester, which comprises a ground electric wave partial discharge tester body and a sine wave signal generator arranged on one side of the ground electric wave partial discharge tester body. The TEV sensor is connected with the earth electric wave partial discharge instrument body and is arranged on the outer wall of one side of the signal injection cabinet; the signal injection cabinet is arranged on one side of the earth electric wave partial discharge instrument body; the high-frequency capacitor is arranged in the signal injection cabinet; the power amplifier is arranged on one side of the signal injection cabinet and is connected with the high-frequency capacitor and the sine wave signal generator; the grounding end is arranged on the outer wall of one side of the signal injection cabinet; the HFCT sensor is connected with the grounding end; the method can calibrate the earth electric wave partial discharge instrument body, is closer to the actual calibration method and actual use condition of the earth electric wave partial discharge instrument body, and greatly improves the reliability of the result of the earth electric wave partial discharge instrument body.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ground wave partial discharge tester technical field, specifically a ground wave partial discharge tester calibration device. BACKGROUND

[0002] Prior art: the sine signal generator output signal amplitude is adjusted to appropriate size and maintains unchangeable, the frequency of sine wave is changed between the cut-off frequency of the measured instrument, and the center frequency in the output signal constant region of the measured instrument is measured.

[0003] The frequency of the sine wave signal is reduced by 1MHz step, and the output voltage amplitude is unchanged, and the frequency point when the normalized output of the measured instrument is reduced to 0.501 (-6dB point) is found out, which is the measured lower limit cut-off frequency. The frequency of the sine wave signal is increased by 1MHz step, and the measured upper limit cut-off frequency is measured by the same method.

[0004] The prior art has the following disadvantages: the ground wave partial discharge tester calibration device is a device for calibrating the frequency band calibration, amplitude linearity error, sensitivity calibration and continuous working stability accuracy of the ground wave partial discharge tester. In actual use conditions, the ground wave partial discharge tester outputs a fixed frequency pulse signal through a sine signal generator, and the TEV sensor of the ground wave partial discharge tester is attached to the metal plate for measurement. Because it cannot truly simulate the normal working environment of the ground wave partial discharge tester, the accuracy of the measurement cannot be guaranteed. Therefore, the ground wave partial discharge tester calibration device is proposed to solve the above-mentioned problems. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a ground wave partial discharge tester calibration device to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A ground wave partial discharge tester calibration device, characterized by comprising:

[0008] The ground wave partial discharge tester body, the sine wave signal generator and the signal injection cabinet are provided with a high-frequency capacitor inside, and the high-frequency capacitor is electrically connected with the sine wave signal generator, one side of the signal injection cabinet is provided with a TEV sensor, and the TEV sensor is connected with the ground wave partial discharge tester body;

[0009] The power amplifier is arranged between the high-frequency capacitor and the sine wave signal generator;

[0010] As a further scheme of the utility model: the bottom side of signal injection cabinet is provided with grounding terminal, and the grounding terminal is connected with high frequency capacitor.

[0011] As a further scheme of the utility model: or the grounding terminal is connected with HFCT sensor, and the HFCT sensor is connected with ground electric wave partial discharge instrument body.

[0012] As a further scheme of the utility model: the ground electric wave partial discharge instrument body is electrically connected with sinusoidal wave signal generator through signal cable, and the ground electric wave partial discharge instrument body and sinusoidal wave signal generator are connected with metal plate through coaxial cable.

[0013] As a further scheme of the utility model: one side of the metal plate is provided with another TEV sensor, and the TEV sensor is connected with ground electric wave partial discharge instrument body.

[0014] As a further scheme of the utility model: the metal plate is installed in the inside of shell, and one side of the shell is provided with interface, the interface is connected with metal plate through wire, and one side wire is connected with resistance in series.

[0015] As a further scheme of the utility model: the metal plate is galvanized iron plate.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The ground electric wave partial discharge tester calibration device can calibrate the ground electric wave partial discharge instrument body, is closer to the actual calibration method and actual use condition of the ground electric wave partial discharge instrument body, and greatly improves the reliability of ground electric wave partial discharge instrument body result. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is voltage sensor tester frequency band calibration wiring diagram of the utility model.

[0019] Figure 2 It is current sensor tester frequency band calibration wiring diagram of the utility model.

[0020] Figure 3 It is frequency band test wiring diagram of the utility model.

[0021] Figure 4 It is metal plate structure schematic view of the utility model.

[0022] Wherein: 1, the ground wave local discharge instrument body; 2, sine wave signal generator; 3, TEV sensor; 4, signal injection cabinet; 5, high-frequency capacitor; 6, ground terminal; 7, HFCT sensor; 8, power amplifier; 9, shell; 10, metal plate; 11, wire; 12, resistance; 13, interface. DETAILED DESCRIPTION

[0023] Example one

[0024] As Figure 1 shown, a ground wave local partial discharge tester calibration device, comprising: ground wave local discharge instrument body 1, sine wave signal generator 2 and signal injection cabinet 4, the inside of signal injection cabinet 4 is provided with high-frequency capacitor 5, and high-frequency capacitor 5 is electrically connected with sine wave signal generator 2, one side of signal injection cabinet 4 is provided with TEV sensor 3, and TEV sensor 3 is connected with ground wave local discharge instrument body 1; power amplifier 8 is arranged between high-frequency capacitor 5 and sine wave signal generator 2; the bottom side of signal injection cabinet 4 is provided with ground terminal 6, and ground terminal 6 is connected with high-frequency capacitor 5, the shell of signal injection cabinet 4 is also grounded, which is suitable for voltage sensor tester frequency band calibration in this embodiment.

[0025] Example two

[0026] As Figure 2 shown, a ground wave local partial discharge tester calibration device, comprising: ground wave local discharge instrument body 1, sine wave signal generator 2 and signal injection cabinet 4, the inside of signal injection cabinet 4 is provided with high-frequency capacitor 5, and high-frequency capacitor 5 is electrically connected with sine wave signal generator 2, power amplifier 8 is arranged between high-frequency capacitor 5 and sine wave signal generator 2; the bottom side of signal injection cabinet 4 is provided with ground terminal 6, and ground terminal 6 is connected with high-frequency capacitor 5, the shell of signal injection cabinet 4 is also grounded, the other end of ground terminal 6 is connected with HFCT sensor 7, and HFCT sensor 7 is connected with ground wave local discharge instrument body 1, which is suitable for current sensor tester frequency band calibration in this embodiment.

[0027] Further, referring to Figure 3 , Figure 4, the ground electric wave partial discharge tester body 1 is electrically connected with the sinusoidal wave signal generator 2 through a signal cable, and the ground electric wave partial discharge tester body 1 and the sinusoidal wave signal generator 2 are connected with the metal plate 10 through a coaxial cable; one side of the metal plate 10 is provided with another TEV sensor 3, and the TEV sensor 3 is connected with the ground electric wave partial discharge tester body 1; the metal plate 10 is installed in the inside of the shell 9, and one side of the shell 9 is provided with an interface 13, the interface 13 is connected with the metal plate 10 through a wire 11, and one side of the wire 11 is connected with a resistor 12 in series; the metal plate 10 is a galvanized iron plate, the galvanized iron plate is 300mm long, 300mm wide and 3mm thick (the corners are preferably treated in a circular arc shape).

[0028] Specifically, the amplitude of the output signal of the sinusoidal wave signal generator 2 is adjusted to an appropriate size and maintained unchanged, the frequency of the sinusoidal wave signal generator 2 is changed, the frequency at which the amplitude of the signal measured by the ground electric wave partial discharge tester body 1 is maximum is found out, the amplitude reading of the ground electric wave partial discharge tester body 1 is recorded, and this is taken as the frequency reference. The frequency of the sinusoidal wave signal is reduced, and the amplitude of the output voltage of the sinusoidal wave signal generator 2 is kept unchanged, the frequency point at which the amplitude of the ground electric wave partial discharge tester body 1 is reduced to 0.5 times the display value and reduced by 6dB is found out, and this point is the measured lower limit frequency; then the frequency of the sinusoidal wave signal is increased, and the measured upper limit frequency is found out in the same way; the ground electric wave partial discharge tester body 1 can be calibrated, which is closer to the actual calibration method and actual use of the ground electric wave partial discharge tester body 1, and greatly improves the reliability of the results of the ground electric wave partial discharge tester body 1.

[0029] The above embodiment discloses a ground electric wave partial discharge tester calibration device, the amplitude of the output signal of the sinusoidal wave signal generator 2 is adjusted to an appropriate size and maintained unchanged, the frequency of the sinusoidal wave signal generator 2 is changed, the frequency at which the amplitude of the signal measured by the ground electric wave partial discharge tester body 1 is maximum is found out, the amplitude reading of the ground electric wave partial discharge tester body 1 is recorded, and this is taken as the frequency reference. The frequency of the sinusoidal wave signal is reduced, and the amplitude of the output voltage of the sinusoidal wave signal generator 2 is kept unchanged, the frequency point at which the amplitude of the ground electric wave partial discharge tester body 1 is reduced to 0.5 times the display value and reduced by 6dB is found out, and this point is the measured lower limit frequency; then the frequency of the sinusoidal wave signal is increased, and the measured upper limit frequency is found out in the same way; the error of the upper and lower limit frequencies is calculated according to formula (1):

[0030]

[0031] In the formula:

[0032] γ f is the error of the upper and lower limit frequencies;

[0033] f B is the upper and lower limit nominal frequencies of the instrument to be calibrated;

[0034] f is the measured upper and lower limit frequencies of the instrument to be calibrated.

[0035] The above merely illustrates the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A geoelectric wave partial discharge tester calibration device, characterized in that, Include: The ground wave local emission instrument body (1), sine wave signal generator (2) and signal injection cabinet (4), the inside of signal injection cabinet (4) is provided with high frequency capacitor (5), and high frequency capacitor (5) is connected with sine wave signal generator (2), one side of signal injection cabinet (4) is provided with TEV sensor (3), and TEV sensor (3) is connected with ground wave local emission instrument body (1); Power amplifier (8) is arranged between high frequency capacitor (5) and sine wave signal generator (2).

2. The geoelectric wave partial discharge tester calibration device of claim 1, wherein, The bottom side of the signal injection cabinet (4) is provided with a grounding terminal (6), and the grounding terminal (6) is connected with the high frequency capacitor (5).

3. The geoelectric wave partial discharge tester calibration device of claim 2, wherein, Or the grounding terminal (6) is connected with the HFCT sensor (7), and the HFCT sensor (7) is connected with the ground wave local emission instrument body (1).

4. The geoelectric wave partial discharge tester calibration device of claim 1, wherein, The ground wave local emission instrument body (1) is electrically connected with the sine wave signal generator (2) through a signal cable, and the ground wave local emission instrument body (1) and the sine wave signal generator (2) are connected with the metal plate (10) through a coaxial cable.

5. The geoelectric wave partial discharge tester calibration device of claim 4, wherein, One side of the metal plate (10) is provided with another TEV sensor (3), and the TEV sensor (3) is connected with the ground wave local emission instrument body (1).

6. The geoelectric wave partial discharge tester calibration device of claim 4, wherein, The metal plate (10) is installed in the inside of the shell (9), and one side of the shell (9) is provided with an interface (13), the interface (13) is connected with the metal plate (10) through a wire (11), and one side of the wire (11) is connected with a resistor (12) in series.

7. The geoelectric wave partial discharge tester calibration device of claim 4, wherein, The metal plate (10) is a galvanized iron plate.

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