CN211236214U - Calibration device of whole inspection device of mutual inductor calibrator - Google Patents

Abstract

The utility model provides a calibration device of device is examined in order to mutual-inductor calibration instrument, including the device shell, be provided with the electric current check-up terminal and the voltage check-up terminal that convenient and mutual-inductor calibration instrument is connected on the device shell, still be provided with power access port, switch at the device shell, host computer communication interface and display screen, power access port connects the commercial power and is used for supplying power for the device, switch controlling means opens and closes, host computer communication interface is used for realizing the communication of device and host computer, the display screen is used for showing the calibration result. The utility model discloses optimization test step that can be very big, simplify the test process, improve automatic level, alleviate the reliability that testing personnel intensity of labour, improvement work efficiency, assurance standard volume passed.

Description

Calibration device of whole inspection device of mutual inductor calibrator

Technical Field

The utility model belongs to the whole device calibration field of examining of mutual-inductor calibrator especially relates to a whole calibrating device who examines device of mutual-inductor calibrator.

Background

The calibration of the whole detection device (the whole detection device for short) of the existing transformer calibrator adopts the whole detection device calibrator, and the test is based on the appendix D of JJG 169-. Namely a calibration method of the whole detection device of the transformer calibrator.

The method adopts a zero value method of indirect measurement (comparison measurement), namely a method for determining a measured value by changing a standard quantity to be equal to the measured value (namely, the difference value of the two is zero) in the measurement process. The use of this method has the following drawbacks:

1. the whole calibration method has the disadvantages of complicated steps, complex adjustment and extremely high requirement on testers.

2. Manual operation is adopted, automation cannot be realized, and calibration efficiency is low.

3. The method is easy to bring human errors, the whole equipment introduces too many uncertain factors of errors, and the reliability of the test result is not high.

4. When the adjustment fineness of the detected whole detection device is not enough or the internal impedance is too large, accurate calibration cannot be carried out.

5. The existing calibration equipment and the calibration method can not calibrate the impedance and the admittance loop of the whole detection device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a calibration device of device is examined in order to mutual-inductor calibrator, optimization test step that can be very big, simplify the test process, improve automatic level, alleviate the reliability that testing personnel intensity of labour, improvement work efficiency, assurance standard volume were passed.

The technical scheme of the utility model:

the utility model provides a calibration device of device is examined in order to mutual-inductor calibration instrument, includes the device shell, is provided with current check-up terminal and the voltage check-up terminal that convenient and mutual-inductor calibration instrument is connected on the device shell, still is provided with power access port, switch at the device shell, upper computer communication interface and display screen, power access port connects the commercial power and is used for supplying power for the device, switch controlling means opens and closes, upper computer communication interface is used for realizing the communication of device and host computer, the display screen is used for showing the calibration result.

Install the mainboard in the device shell, install power transformer, wave filter, communication connecting plate, power strip, analog board, digital board, current transformer and current voltage transformer on the mainboard respectively, power transformer communicates with power access port for change the commercial power into the direct current that is fit for the device to use, the wave filter is used for carrying out filtering operation with the direct current that passes through power transformer transform, install communication chip on the communication connecting plate, communication chip on the communication connecting plate and host computer communication interface connection for make mainboard and host computer time communication, install power chip on the power strip and be used for supplying power for each component on the mainboard, install the sampling chip on the analog board, install the processing chip on the digital board, current transformer and current voltage transformer are connected with the analog board, the analog board is connected with the digital board and used for converting the error current analog quantity into digital quantity and then sending the digital quantity into the digital board for processing.

The analog board is provided with an I/P converter for converting error current into error voltage, voltage signals passing through the I/P converter are input to an amplifying circuit for signal amplification, amplified signals pass through a filter circuit for filtering noise waves and then are conveyed to an A/D converter, the analog board is also provided with a second amplifying circuit for amplifying reference current, reference current signals amplified by the second amplifying circuit are conveyed to the second filter circuit for filtering and then are conveyed to the A/D converter after being amplified by a third amplifying circuit again, error voltage signals and reference current signals converted by the A/D converter are conveyed to a sampling calculation chip arranged on the digital board, and the sampling calculation chip calculates a ratio difference and a phase difference.

Compared with the prior art, the beneficial effects of the utility model are that: by adopting the electronic design, the automatic control and the automatic data transmission are realized, the adjustment of various gears by a tester is not needed, the test personnel is also not needed to judge whether to return to zero according to experience, and the test data is also not needed to be manually recorded and manually input. The method has the advantages of greatly optimizing test steps, simplifying test process, improving automation level, reducing labor intensity of testers, improving working efficiency and ensuring the reliability of standard quantity transmission. The impedance and admittance of the whole detection device can be calibrated.

Drawings

FIG. 1 is a schematic view of the connection between the whole inspection device and the calibration device of the instrument transformer calibrator of the present invention;

FIG. 2 is a schematic view of a housing of the calibrating device of the present invention;

FIG. 3 is a schematic view of the internal structure of the calibrating device of the present invention;

fig. 4 is a schematic diagram of the checking principle of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a calibration device of device is examined in order to mutual-inductor calibration instrument, includes device shell 1, is provided with current check-up terminal 2 and the voltage check-up terminal 3 that convenient and mutual-inductor calibration instrument is connected on device shell 1, still is provided with power access port 4, switch 5 at device shell 1, upper computer communication interface 6 and display screen 7, power access port 4 is connected the commercial power and is used for supplying power for the device, switch 5 controlling means open and close, upper computer communication interface 6 is used for realizing the communication of device and host computer, display screen 7 is used for showing the calibration result.

A mainboard 10 is arranged in the device shell 1, a power transformer 11, a filter 12, a communication connecting board 13, a power board 14, an analog board 15, a digital board 16, a current transformer 18 and a current-voltage transformer 17 are respectively arranged on the mainboard 10, the power transformer 11 is communicated with a power access port 4 and is used for converting commercial power into direct current suitable for being used by the device, the filter 12 is used for filtering the direct current converted by the power transformer 11, a communication chip is arranged on the communication connecting board 13, the communication chip on the communication connecting board 13 is connected with a communication interface 6 of an upper computer and is used for enabling the mainboard 10 to be in time communication with the upper computer, the power chip is arranged on the power board 14 and is used for supplying power to each element on the mainboard 10, a sampling chip is arranged on the analog board 15, and a processing chip is arranged on the digital, the current transformer 18 and the current voltage transformer 17 are connected with the analog board 15 to collect analog quantity of error current, and the analog board 15 is connected with the digital board 16 to convert the analog quantity of error current into digital quantity and send the digital quantity to the digital board 16 for processing.

The analog board 15 is provided with an I/P converter 100 for converting error current into error voltage, a voltage signal passing through the I/P converter 100 is input to an amplifying circuit 101 for signal amplification, the amplified signal is filtered by a filter circuit 102 to remove noise and then is transmitted to an A/D converter 103, the analog board 15 is also provided with a second amplifying circuit 105 for amplifying reference current, the reference current signal amplified by the second amplifying circuit 105 is transmitted to a second filter circuit 106 for filtering, then is amplified by a third amplifying circuit 107 again and is transmitted to the A/D converter 103, the error voltage signal and the reference current signal converted by the A/D converter 103 are transmitted to a sampling calculation chip 104 arranged on a digital board 16, and the sampling calculation chip 104 calculates a ratio difference and a phase difference.

When the novel whole checking device calibrator is adopted to check the whole checking device of the mutual inductor calibrator, if a current loop is calibrated firstly, the IP and the Delta I are connected into the whole checking device calibrator IP and the Delta I, the whole checking device calibrator is controlled by utilizing the upper computer software to enter a corresponding CT calibration interface, the input of the whole checking device corresponds to an error value, the whole checking device calibrator directly reads out the error value and uploads the error value to the upper computer software for storage, and then the next error point is measured. This is done until all error points have been measured. And finally, the upper computer software can judge whether the error is exceeded or not according to the uploaded data. And finally, a conclusion is given, whether the calibration of the instrument checking device of the mutual inductor is qualified or not is judged, and a corresponding certificate is issued automatically.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. The utility model provides a calibration device of device is examined in order to mutual-inductor calibration appearance, a serial communication port, including device shell (1), be provided with current check terminal (2) and voltage check terminal (3) that convenient and mutual-inductor calibration appearance is connected on device shell (1), still be provided with power access port (4), switch (5) at device shell (1), host computer communication interface (6) and display screen (7), power access port (4) are connected the commercial power and are used for supplying power for the device, switch (5) controlling means open and close, host computer communication interface (6) are used for realizing the communication of device and host computer, display screen (7) are used for showing the calibration result.

2. The calibration device of the instrument transformer calibrator whole inspection device according to claim 1, wherein a main board (10) is installed in the device housing (1), a power transformer (11), a filter (12), a communication connection board (13), a power board (14), an analog board (15), a digital board (16), a current transformer (18) and a current-voltage transformer (17) are respectively installed on the main board (10), the power transformer (11) is communicated with the power access port (4) for converting commercial power into direct current suitable for the device, the filter (12) is used for filtering the direct current converted by the power transformer (11), a communication chip is installed on the communication connection board (13), the communication chip on the communication connection board (13) is connected with the upper computer communication interface (6), the device is used for enabling a main board (10) to be in time communication with an upper computer, a power chip is installed on the power board (14) and used for supplying power to all elements on the main board (10), a sampling chip is installed on the analog board (15), a processing chip is installed on the digital board (16), the current transformer (18) and the current-voltage transformer (17) are connected with the analog board (15) and used for collecting analog quantity of error current, and the analog board (15) is connected with the digital board (16) and used for converting the analog quantity of the error current into digital quantity and then sending the digital quantity into the digital board (16) for processing.

3. The calibration device of the instrument transformer calibration instrument checking device according to claim 2, wherein an I/P converter (100) for converting an error current into an error voltage is installed on the analog board (15), a voltage signal passing through the I/P converter (100) is inputted to the amplifying circuit (101) for signal amplification, the amplified signal is filtered by the filtering circuit (102) for noise elimination and then is transmitted to the a/D converter (103), a second amplifying circuit (105) for amplifying a reference current is also installed on the analog board (15), the reference current signal amplified by the second amplifying circuit (105) is transmitted to the second filtering circuit (106) for filtering and then is amplified again by the third amplifying circuit (107) and then is transmitted to the a/D converter (103), and the error voltage signal and the reference current signal converted by the a/D converter (103) are transmitted to the digital board (16) ) The sampling calculation chip (104) calculates the ratio difference and the phase difference.

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