Rotation speed measuring instrument calibration device

Abstract

The utility model provides a revolution speed measuring instrument verification device, which relates to the measuring instrument field, and comprises a first power supply, a revolution speed measuring instrument, a display, a test lead, a relay protection instrument, a second power supply and an insulation resistance tester, the relay protection instrument is connected with the revolution speed measuring instrument through the test lead, and the output voltage frequency of the relay protection instrument can be changed. And the analog rotating speed signal can be input to the rotating speed measuring instrument. According to the calibration device for the rotating speed measuring instrument, the output voltage frequency of the relay protection instrument is changed, a simulation rotating speed signal is input to the rotating speed measuring instrument, the output of the rotating speed measuring instrument can be displayed through the display device, and finally an error is calculated by comparing a numerical value on a display of the rotating speed measuring instrument with a set value of the relay protection instrument. Therefore, whether the rotating speed measuring instrument is qualified or not can be obtained, and the problems in the background technology are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instruments, in particular to a rotation speed measuring instrument calibration device. Background Art

[0002] The measuring instrument is a physical performance testing instrument used in the field of physics. It belongs to the category of physical performance testing instruments and is used to measure and test various physical quantities, such as voltage, pressure, and frequency. The speed measuring instrument is the most common monitoring instrument in industrial processes. It is mainly used for speed measurement of turbines in hydropower stations. Generally, single-chip microcomputer technology is used to centrally collect the speeds that need to be monitored, and display and process them. This instrument is widely used in various industrial automation systems in hydropower stations, metallurgy, chemical industry and other industries. It has strong functions, small size and high reliability. The turbine speed signal is mainly used for feedback adjustment of the speed governor. It controls the increase and decrease speed according to the monitoring instructions or PID instructions, changes the active power of the unit, meets the load requirements of the power grid, and ensures the stability of the power grid. The safe and stable operation of the speed measuring instrument plays an important role in turbine regulation.

[0003] Currently, there is a lack of specialized calibration equipment for speed measuring instruments. Failure to calibrate the measuring instrument will lead to errors in the measurement results. These errors may lead to inaccurate data, poor product quality, and excessively long measurement times. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a rotation speed measuring instrument calibration device, which solves the problems raised in the background technology.

[0005] Technical Solution

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions: a speed measuring instrument calibration device, including a first power supply, a speed measuring instrument, a display, a test wire, a relay protection instrument, a second power supply, and an insulation resistance tester. The relay protection instrument and the speed measuring instrument are connected through the test wire, the output voltage frequency of the relay protection instrument can be changed, the analog speed signal can be input to the speed measuring instrument, and the output of the speed measuring device can be displayed through a display device. A first wire is installed between the first power supply and the speed measuring instrument, a second wire is installed between the relay protection instrument and the second power supply, and a third wire is installed between the speed measuring instrument and the display.

[0007] Furthermore, the relay protection device is configured to output AC voltage, and the voltage amplitude is fixed at 10V.

[0008] Furthermore, the error is calculated by comparing the value on the display of the rotation speed measuring instrument with the set value of the relay protection instrument.

[0009] Furthermore, a fourth wire is installed between the insulation resistance tester and the rotation speed measuring instrument, and a wire is connected between the terminal lead of the rotation speed measuring instrument and its housing, and its insulation resistance is measured.

[0010] Furthermore, the relay protection instrument selects to output -Hz AC voltage according to the measuring range of the detector, and records the output value transmitted to the display by the speed measuring instrument for each frequency value output.

[0011] The beneficial effects of the utility model are:

[0012] 1. The speed measuring instrument calibration device changes the output voltage frequency of the relay protection instrument, and the simulated speed signal is input to the speed measuring instrument. The output of the speed measuring device can be displayed through the display device. Finally, by comparing the value on the speed measuring instrument display with the set value of the relay protection instrument to calculate the error, the qualification of the speed measuring instrument can be obtained, thereby solving the problem raised in the background technology.

[0013] 2. The speed measuring instrument calibration device, through the setting of the relay protection instrument, selects the output of 0-50Hz AC voltage according to the range of the detector, records the output value on the display of the speed measuring instrument for each frequency value output, connects the wire between the terminal of the speed measuring instrument and its casing, and measures its insulation resistance, compares the recorded data with the output of the relay protection instrument, calculates the data error, and draws the calibration conclusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a top view of the overall structure of the utility model.

[0016] Among them: 1. First power supply; 2. Speed ​​measuring instrument; 3. Display; 4. Test wire; 5. Relay protection instrument; 6. Second power supply; 7. Insulation resistance tester; 8. First wire; 9. Second wire; 10. Third wire; 11. Fourth wire. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-Figure 2A speed measuring instrument calibration device includes a first power supply 1, a speed measuring instrument 2, a display 3, a test wire 4, a relay protection instrument 5, a second power supply 6, and an insulation resistance tester 7. The power supply is mainly used to supply power to the speed measuring instrument 2 and the relay protection instrument. The relay protection instrument 5 is a new type of intelligent testing instrument, which is mainly used for testing and researching various types of electromagnetic, integrated circuit and microcomputer protection relays and protection systems of various voltage levels, and has the flexible control capability of voltage and current amplitude, phase frequency, and has a dedicated test module for various relays and protections. It is an essential tool for pre-commissioning and regular inspection of protection devices of power grassroots units. The value on the display 3 of the speed measuring instrument 2 is compared with the set value of the relay protection instrument 5 to calculate the error. A fourth wire 11 is installed between the insulation resistance tester 7 and the speed measuring instrument 2. A wire is connected between the terminal outlet of the measuring instrument 2 and its casing, and its insulation resistance is measured. The relay protection instrument 5 and the speed measuring instrument 2 are connected through a test wire 4. The output voltage frequency of the relay protection instrument 5 can be changed. The relay protection instrument 5 is set to AC voltage output, and the voltage amplitude is fixed at 10V. The relay protection instrument 5 selects to output an AC voltage of 0-50Hz according to the range of the detector, and each time a frequency value is output, the output value transmitted to the display 3 by the speed measuring instrument 2 is recorded. The analog speed signal can be input into the speed measuring instrument 2, and the output of the speed measuring device can be displayed through the display device. A first wire 8 is installed between the first power supply 1 and the speed measuring instrument 2, a second wire 9 is installed between the relay protection instrument 5 and the second power supply 6, and a third wire 10 is installed between the speed measuring instrument 2 and the display 3.

[0019] When in use, first connect the speed meter 2 to the power supply, check that the device is operating well and the digital display on the display 3 is normal, connect the relay protection device 5 to the power supply, check that the equipment is operating normally, connect the voltage output terminal of the relay protection device 5 to the input terminal of the speed meter 2 through the test wire 4, check that each device is connected normally, change the frequency output value of the relay protection device 5, record the value on the display 3 of the speed meter 2, and finally calculate the error to obtain the accuracy of the speed meter 2, and connect the insulation resistance tester 7 to the speed meter 2 through the fourth wire 11.

[0020] Then, before calibrating the tachometer 2, first connect the first power supply 1, power it on, check that the equipment and display 3 are operating normally, realize the voltage output function through the relay protection device 5, and freely adjust the output frequency, insert one end of the prepared test wire 4 into the voltage output terminal of the relay protection device 5, and connect the other end to the input terminal of the tachometer 2.

[0021] Next, after checking that the first wire 8, the second wire 9, the third wire 10, the test wire 4 and the device are normal, the calibration begins. After the test begins, the relay protection instrument 5 is set, and the output of 0-50Hz AC voltage is selected according to the range of the detector. Each time a frequency value is output, the output value on the display 3 of the speed measuring instrument 2 is recorded. Generally, at least 100 measuring points should be selected for calibration, or the accuracy of other measuring points used for calibration should be increased according to the actual use of the power plant.

[0022] Finally, connect a wire between the terminal lead of the speed measuring instrument 2 and its casing, and measure its insulation resistance. Compare the recorded data with the output of the relay protection instrument 5, calculate the data error, and draw a verification conclusion.

[0023] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rotation speed measuring instrument calibration device, characterized in that: The invention comprises a first power supply (1), a rotation speed measuring instrument (2), a display (3), a test lead (4), a relay protection instrument (5), a second power supply (6), and an insulation resistance tester (7); the relay protection instrument (5) and the rotation speed measuring instrument (2) are connected via the test lead (4); the output voltage frequency of the relay protection instrument (5) can be changed; the analog rotation speed signal can be input to the rotation speed measuring instrument (2); the output of the rotation speed measuring instrument can be displayed via a display device; a first lead (8) is installed between the first power supply (1) and the rotation speed measuring instrument (2); a second lead (9) is installed between the relay protection instrument (5) and the second power supply (6); and a third lead (10) is installed between the rotation speed measuring instrument (2) and the display (3).

2. A rotation speed measuring instrument calibration device according to claim 1, characterized in that: The relay protection device (5) is configured to output an alternating voltage, and the voltage amplitude is fixed at 10V.

3. A rotation speed measuring instrument calibration device according to claim 1, characterized in that: The error is calculated by comparing the value on the display of the rotation speed measuring instrument (2) with the set value of the relay protection instrument (5).

4. A rotation speed measuring instrument calibration device according to claim 1, characterized in that: A fourth wire (11) is installed between the insulation resistance tester (7) and the rotation speed measuring instrument (2), and a wire is connected between the terminal lead of the rotation speed measuring instrument (2) and its housing to measure its insulation resistance.

5. The rotation speed measuring instrument calibration device according to claim 1, characterized in that: The relay protection device (5) selects to output an AC voltage of 0-50 Hz according to the measuring range of the detector, and records the output value transmitted by the rotation speed measuring device (2) to the display (3) for each frequency value output.

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