Polarity tester for metering device

Abstract

The invention belongs to the technical field of electrical equipment testing, and particularly relates to a polarity tester for a metering device. The tester comprises a power supply module, an input module, a test module, a display module and a control module which are installed in a box body. The power supply module comprises a power supply transformer, a rectifier bridge, a filter capacitor and a voltage stabilizer; the input module comprises a test line, an input interface, an amplifier and a filter; the test module comprises a voltage sensor and a comparator; the display module comprises a display screen, an indicating lamp and a button; the control module comprises a microcontroller and a relay; a heightening assembly is further arranged on the periphery of the box body and comprises a plurality of limiting cavities, a plurality of moving rods and rolling wheels installed at the bottom ends of the moving rods respectively. According to the tester, the polarity in the circuit can be accurately measured, the accuracy of a test result is ensured, the test result is displayed on the implementation screen, the polarity test can be quickly and efficiently carried out, and time and human resources are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment testing, and in particular relates to a polarity tester for a metering device. Background Art

[0002] The polarity of the current transformer determines the direction of the induced current in the secondary winding. Correct polarity connection can ensure the accuracy of the current direction, thereby ensuring the correct operation of the relay protection device and the instrument. If the polarity of the current transformer is connected incorrectly, it may cause the relay protection device to malfunction or refuse to operate, thereby affecting the operation monitoring and accident handling of the power system. Through polarity testing, the problem of wrong polarity connection can be discovered and corrected in time to avoid potential safety hazards. The polarity of the current transformer also affects the accuracy of electric energy metering. If the polarity is connected incorrectly, it may cause problems such as reverse pointing of active and reactive power meters, reversal of active and reactive energy meters, etc., thereby affecting the accuracy of electric energy metering. Therefore, whether a metering device polarity tester for performing polarity testing on current transformers can be set up is a problem to be solved urgently in the present invention. Summary of the invention

[0003] In view of this, the present invention provides a metering device polarity tester.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A metering device polarity tester, the tester comprising a power module, an input module, a test module, a display module and a control module installed in a box; The power supply module provides the power required for the test, including a power transformer, a rectifier bridge, a filter capacitor and a voltage stabilizer; The input module is used to receive an external DC signal to be tested and transmit it to the test module, and the input module includes a test line, an input interface, an amplifier and a filter; The test module is used to test and analyze the input DC signal, and includes a voltage sensor and a comparator; The display module is used to display the test results, including a display screen, indicator lights and buttons; The control module is used to control the working process of the tester, and comprises a microcontroller and a relay; A height-increasing assembly is also arranged around the box body, and the height-increasing assembly includes a plurality of limiting cavities, a plurality of shifting rods and rollers respectively installed at the bottom end of each of the shifting rods.

[0005] Furthermore, the plurality of limit cavities are respectively opened at the four corners of the box body, and the openings of the plurality of limit cavities are arranged downward; the plurality of shift rods are respectively installed in the limit cavities, and the top ends of the shift rods are connected to the inner tops of the limit cavities through elastic components.

[0006] Furthermore, at least one of the limiting cavities has a first opening; the shift rod has a plurality of second openings; an L-shaped threaded rod is used to penetrate the first opening and one of the second openings to limit the shift rod on the limiting cavity.

[0007] Furthermore, the plurality of rollers are connected as a whole via cross connecting rods.

[0008] Furthermore, a fixing block is fixedly provided on the upper surface of the cross-link, and the fixing block includes a first round rod and a second round rod fixed together longitudinally, the radial dimension of the first round rod is larger than the radial dimension of the second round rod, and the bottom end of the second round rod is fixed on the cross-link.

[0009] Furthermore, a card slot is movably installed on the periphery of the fixed block, a third opening is opened at the bottom end of the card slot, and the third opening of the card slot is connected to the second round rod of the fixed block; and an internal thread is arranged on the inner periphery of the card slot; a card block is arranged on the outer bottom of the box body, an external thread is arranged on the card block, and the card block is threadedly connected to the card slot.

[0010] Furthermore, the power supply module, the amplifier and filter in the input module, the voltage sensor and comparator, the microcontroller and the relay are all installed in a control slot in the box.

[0011] Furthermore, the display module is installed on the outer wall of the box; and the input interface is arranged on the box.

[0012] Furthermore, an insulating storage cavity is opened on one side of the box body.

[0013] Furthermore, a handle is fixed on the box body.

[0014] The beneficial effects of the present invention are: Provide stable power supply. The power supply module can provide stable and reliable power supply to ensure the stability of power supply during the test process, thereby improving the accuracy and reliability of the test; receive and transmit electrical signals. The input module can receive external DC signals to be tested and transmit them to the test module to ensure accurate signal transmission; test and analyze electrical signals. The test module can test and analyze the input DC signals, including test circuits, voltage sensors and comparators, thereby achieving comprehensive testing and analysis of electrical signals; display test results. The display module can display test results, including a display screen, indicator lights and buttons, which are convenient for users to view and operate; control the workflow of the tester. The control module can control the workflow of the tester, including a microcontroller and relays, to achieve intelligent control of the tester; height-increasing components are arranged around the box, including multiple limit cavities, multiple shift rods and rollers installed at the bottom of each shift rod, which can adjust the overall height of the tester. The tester can be easily moved by pulling the handle during walking transportation, thereby saving effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the present invention.

[0016] Figure 2 It is a rear view schematic diagram of the present invention.

[0017] Figure 3 It is a cross-sectional view of the present invention.

[0018] Figure 4 It is a schematic diagram of the state after the box door is opened.

[0019] Figure 5 is a perspective view of the present invention (showing only the heightened components).

[0020] Figure 6 It is an enlarged schematic diagram of the cross connecting rod of the present invention.

[0021] Figure 7 It is an enlarged schematic diagram of the fixing block of the present invention. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0024] It should be noted that in the present application, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0025] like Figure 1-7 As shown, a polarity tester for a metering device comprises a power module, an input module, a test module, a display module 2 and a control module installed in a box body 1.

[0026] The power module provides the power required for the test, including a power transformer, a rectifier bridge, a filter capacitor and a voltage stabilizer. The power transformer converts the input AC voltage into the required DC voltage. It uses the principle of electromagnetic induction to induce an AC voltage with the same frequency in the secondary winding, and then converts this AC voltage into a DC voltage through a rectifier bridge. The filter capacitor is used to smooth voltage fluctuations, and the voltage stabilizer is used to maintain the stability of the output voltage.

[0027] The input module is used to receive an external DC signal to be tested and transmit it to the test module. The input module includes a test line, an input interface 3, an amplifier and a filter. The input interface 3 is used to receive an external signal, the amplifier is used to amplify the input external signal, and the filter is used to remove noise from the input external signal.

[0028] The test module is used to test and analyze the input DC signal, including a voltage sensor and a comparator. The voltage sensor is used to sense the voltage data state of the object under test. The comparator is used to compare the input test signal with a preset threshold value, specifically, the input test signal is compared with the preset threshold value. The comparator will output a corresponding signal according to the comparison result. If the test signal is greater than the preset threshold value, the comparator will output a high-level signal; if the test signal is less than the preset threshold value, the comparator will output a low-level signal. The setting of the threshold should be carried out according to specific test requirements and standards. The output signal of the comparator can be received and displayed by the display module 2 via the control module so that the user can view the test results.

[0029] The display module 2 includes a display screen, an indicator light and a button assembly. The display module 2 is used to display the test results, including a display screen, an indicator light and a button. The display screen is used to display the test results, the indicator light is used to indicate the test status, and the button is used to control the display content. The button includes a power switch button. In addition, the display module 2 is installed on the outer wall of the box 1; the input interface 3 is arranged on the box 1, and the input interface 3, that is, two wiring heads are respectively connected to the external current transformer to detect the voltage value.

[0030] The control module is used to control the working process of the tester, and includes a microcontroller and a relay. The microcontroller is used to execute the control program, and the relay is used to control the on and off of the circuit.

[0031] The power module, the amplifier and filter in the input module, the voltage sensor and comparator, the microcontroller and the relay are all installed in the control slot 4 in the box 1.

[0032] A height-increasing assembly is also arranged around the box body 1 , and the height-increasing assembly includes four limit cavities 5 , four shift rods 6 , and rollers 10 respectively installed at the bottom end of each shift rod 6 .

[0033] The four limiting cavities 5 are respectively opened at the four corners of the box body 1, and the openings of the four limiting cavities 5 are arranged downward. The four shift rods 6 are respectively installed in the limiting cavities 5 one by one, and the top of the shift rod 6 is connected to the inner top of the limiting cavity 5 through the elastic component 7. In this embodiment, the elastic component 7 is a spring.

[0034] There is a first opening 8 on a limiting cavity 5 . Five second openings 9 are formed on the shift rod 6 corresponding to the limiting cavity 5 . An L-shaped threaded rod 17 is used to penetrate the first opening 8 and one of the second openings 9 to limit the shift rod 6 on the limiting cavity 5 .

[0035] The four rollers 10 are connected as a whole via a cross link 11 , and this arrangement can ensure that the four shift rods 6 can be extended and retracted synchronously.

[0036] A fixing block 12 is welded to the upper surface of the cross link 11. The fixing block 12 includes a first round rod 13 and a second round rod 14 which are longitudinally fixed together. The radial dimension of the first round rod 13 is larger than the radial dimension of the second round rod 14. The bottom end of the second round rod 14 is fixed to the cross link 11.

[0037] The outer periphery of the fixing block 12 is movably provided with a slot 18, and the bottom end of the slot 18 is provided with a third opening, and the third opening of the slot 18 is connected to the second round rod 14 of the fixing block 12. The inner periphery of the slot 18 is provided with an internal thread; the outer bottom of the box body 1 is provided with a block, and the block is provided with an external thread, and the block is threadedly connected to the slot. A handle 15 is fixed to the box body 1.

[0038] An insulating storage cavity 16 is provided on one side of the box body 1. The insulating storage cavity 16 can be used to store other accessories required for the test, making the test site more tidy and orderly, and reducing the risk of confusion and loss.

[0039] When the tester needs to be moved, first rotate the slot to separate the slot from the block, and then rotate the L-shaped threaded rod to cancel the limit of the shift rod 6 in the limit cavity 5; by stretching the shift rod 6, the tester as a whole is at a height that is more suitable for the user, and then rotate the L-shaped threaded rod to connect the first opening 8 and a second opening 9 to limit the shift rod 6; the tester can be easily moved by pushing the push-pull handle 15.

[0040] When the tester needs to be stored or the height of the tester needs to be lowered, first rotate the L-shaped threaded rod to cancel the limit of the shift rod 6, and then partially retract the shift rod 6 into the limit cavity 5; rotate the L-shaped threaded rod again to limit the shift rod 6. In addition, when you want to further fix the height of the tester at this time, you can rotate the slot to limit the card block in the slot.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A measuring device polarity tester, characterized in that: The tester comprises a power module, an input module, a test module, a display module and a control module installed in a box; The power supply module provides the power required for the test, including a power transformer, a rectifier bridge, a filter capacitor and a voltage stabilizer; The input module is used to receive an external DC signal to be tested and transmit it to the test module, and the input module includes a test line, an input interface, an amplifier and a filter; The test module is used to test and analyze the input DC signal, and includes a voltage sensor and a comparator; The display module is used to display the test results, including a display screen, indicator lights and buttons; The control module is used to control the working process of the tester, and comprises a microcontroller and a relay; A height-increasing assembly is also arranged around the box body, and the height-increasing assembly includes a plurality of limiting cavities, a plurality of shifting rods and rollers respectively installed at the bottom end of each of the shifting rods.

2. A measuring device polarity tester according to claim 1, characterized in that: The plurality of limit cavities are respectively opened at the four corners of the box body, and the openings of the plurality of limit cavities are arranged downward; the plurality of shift rods are respectively installed through the limit cavities, and the top ends of the shift rods are connected to the inner tops of the limit cavities through elastic components.

3. A measuring device polarity tester according to claim 2, characterized in that: There is at least one of the limiting cavities with a first opening; the shifting rod is provided with a plurality of second openings; an L-shaped threaded rod is used to penetrate the first opening and one of the second openings to limit the shifting rod on the limiting cavity.

4. A measuring device polarity tester according to claim 3, characterized in that: The plurality of rollers are connected as a whole via cross connecting rods.

5. A measuring device polarity tester according to claim 4, characterized in that: A fixing block is fixedly provided on the upper surface of the cross connecting rod, and the fixing block includes a first round rod and a second round rod fixed together longitudinally, the radial dimension of the first round rod is larger than the radial dimension of the second round rod, and the bottom end of the second round rod is fixed on the cross connecting rod.

6. A measuring device polarity tester according to claim 5, characterized in that: A card slot is movably installed on the periphery of the fixed block, a third opening is opened at the bottom end of the card slot, and the third opening of the card slot is connected to the second round rod of the fixed block; and an internal thread is arranged on the inner periphery of the card slot; a card block is arranged on the outer bottom of the box body, and an external thread is arranged on the card block, and the card block is threadedly connected to the card slot.

7. A measuring device polarity tester according to claim 6, characterized in that: The power supply module, the amplifier and filter in the input module, the voltage sensor and comparator, the microcontroller and the relay are all installed in the control slot in the box.

8. A measuring device polarity tester according to claim 7, characterized in that: The display module is installed on the outer wall of the box; the input interface is arranged on the box.

9. A measuring device polarity tester according to claim 8, characterized in that: An insulating storage cavity is provided on one side of the box body.

10. A polarity tester for a metering device according to claim 9, characterized in that: A handle is fixed on the box body.

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