Verification device for temperature control box of dry-type transformer

Abstract

The utility model discloses a verification device for a temperature control box of a dry-type transformer. The verification device comprises a thermodetector, a potentiometer unit and a power supply unit, the potentiometer unit is connected with a to-be-verified dry-type transformer temperature control box and the thermodetector. The power supply unit is connected with the thermodetector; the potentiometer unit is used for simulating the change of a temperature value so as to verify the protection function of the dry-type transformer temperature control box to be verified, and the thermodetector is used for displaying the temperature value. According to the utility model, the potentiometer unit is adopted to simulate a temperature value, and the dry-type transformer temperature control box to be verified triggers different protection functions based on the temperature value, such as a winding over-temperature alarm function, a winding over-temperature tripping function and an iron core over-temperature alarm function.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature controller calibration, and in particular relates to a calibration device for a dry-type transformer temperature control box. Background Art

[0002] Currently, temperature control box calibration methods include pulling out each protection relay to activate the corresponding protection output, or using a heat gun to heat the temperature probe. Pulling out the relay method is equivalent to only verifying the protection output circuit, but not the protection function board, which has the disadvantage of incomplete calibration. Using a heat gun to heat the transformer, the temperature will be different depending on the heating distance, making it difficult to control the temperature. More importantly, because the temperature probe is glued to a fixed position on the transformer, each time the heat gun is used to heat it, the glue needs to be removed. After the heat gun is used, it is easy to damage the probe and the temperature probe line, making it inconvenient to implement calibration. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a calibration device for a dry-type transformer temperature control box, and its operation method is simpler.

[0004] The utility model is realized through the following scheme:

[0005] A calibration device for a dry-type transformer temperature control box, comprising: a thermometer, a potentiometer unit and a power supply unit;

[0006] The potentiometer unit is connected to the temperature control box of the dry-type transformer to be calibrated and the thermometer;

[0007] The power supply unit is connected to the thermometer;

[0008] The potentiometer unit is used to simulate the change of the temperature value to verify the protection function of the dry-type transformer temperature control box to be verified, and the thermometer is used to display the temperature value.

[0009] As a further improvement of the present invention, the potentiometer unit includes: an A-phase potentiometer assembly, a B-phase potentiometer assembly, a C-phase potentiometer assembly, and an iron core potentiometer assembly, all of which are connected to the temperature control box of the dry-type transformer to be calibrated.

[0010] As a further improvement of the present invention, the A-phase potentiometer assembly, the B-phase potentiometer assembly, the C-phase potentiometer assembly, and the iron core potentiometer assembly are all triple coaxial potentiometers.

[0011] As a further improvement of the present invention, the A-phase potentiometer assembly includes: an A-phase first potentiometer, an A-phase second potentiometer, and an A-phase third potentiometer;

[0012] The fixed end of the first A-phase potentiometer, the fixed end of the second A-phase potentiometer, the sliding end of the first A-phase potentiometer, and the sliding end of the second A-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated;

[0013] The fixed end of the third A-phase potentiometer and the sliding end of the third A-phase potentiometer are connected to the temperature measuring instrument.

[0014] As a further improvement of the present invention, the B-phase potentiometer assembly includes: a B-phase first potentiometer, a B-phase second potentiometer, and a B-phase third potentiometer;

[0015] The fixed end of the first B-phase potentiometer, the fixed end of the second B-phase potentiometer, the sliding end of the first B-phase potentiometer, and the sliding end of the second B-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated;

[0016] The fixed end of the third B-phase potentiometer and the sliding end of the third B-phase potentiometer are connected to the thermometer.

[0017] As a further improvement of the present invention, the C-phase potentiometer assembly includes: the C-phase first potentiometer, the C-phase second potentiometer, and the C-phase third potentiometer;

[0018] The fixed end of the first C-phase potentiometer, the fixed end of the second C-phase potentiometer, the sliding end of the first C-phase potentiometer, and the sliding end of the second C-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated;

[0019] The fixed end of the C-phase third potentiometer and the sliding end of the C-phase third potentiometer are connected to the thermometer.

[0020] As a further improvement of the present invention, the iron core potentiometer assembly includes: a first iron core potentiometer, a second iron core potentiometer, and a third iron core potentiometer;

[0021] The fixed end of the first iron core potentiometer, the fixed end of the second iron core potentiometer, the sliding end of the first iron core potentiometer, and the sliding end of the second iron core potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated;

[0022] The fixed end of the third iron core potentiometer and the sliding end of the third iron core potentiometer are connected to the thermometer.

[0023] As a further improvement of the present invention, the thermometer and the potentiometer unit are connected to the transformer temperature control box via a wiring plug.

[0024] As a further improvement of the present invention, the power supply unit includes: a battery and a switch;

[0025] The battery is connected to the thermometer via the switch.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: a potentiometer unit is used to simulate the temperature value, and the temperature control box of the dry-type transformer to be verified triggers different protection functions based on the temperature value, such as a winding over-temperature alarm function, a winding over-temperature tripping function, and an iron core over-temperature alarm function. At the same time, the real-time temperature is observed by a thermometer. If the temperature reaches the alarm or tripping temperature, the temperature control box of the dry-type transformer to be verified does not trigger the corresponding protection function, then it is proved that the temperature control box of the dry-type transformer to be verified has a fault. Based on this, the temperature control box of the dry-type transformer to be verified can be comprehensively verified, and the verification method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of the test system of the present invention;

[0029] Figure 2 This is the temperature conversion curve of the dry-type transformer temperature control box in the utility model;

[0030] Figure 3 This is a schematic structural diagram of the wiring plug of the present invention.

[0031] Marking instructions: 1. Thermometer; 2. Potentiometer unit; 21. A-phase potentiometer assembly; 22. B-phase potentiometer assembly; 23. C-phase potentiometer assembly; 24. Iron-core potentiometer assembly; 3. Power supply unit; 4. Wiring plug; 100. Dry-type transformer temperature control box to be calibrated. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0034] The utility model discloses a calibration device for a temperature control box of a dry-type transformer, such as Figure 1 As shown, it includes: a thermometer 1, a potentiometer unit 2 and a power supply unit 3; the potentiometer unit 2 is connected to the temperature control box of the dry-type transformer to be calibrated and the thermometer 1; the power supply unit 3 is connected to the thermometer 1; the potentiometer unit 2 is used to simulate the change of the temperature value to calibrate the protection function of the temperature control box of the dry-type transformer to be calibrated, and the thermometer 1 is used to display the temperature value.

[0035] The temperature inside the dry-type transformer temperature control box is automatically converted into temperature according to the resistance value. Based on this, when designing the calibration device, it is necessary to first select the potentiometer unit 2 with the appropriate resistance value, use the potentiometer to change the resistance value, and then convert the action curve of the dry-type transformer temperature control box itself to simulate the corresponding temperature value to control the temperature of the dry-type transformer temperature control box to make the protection action outlet, such as Figure 2 The figure shows the temperature conversion curve of the dry-type transformer temperature control box.

[0036] The thermometer 1 can also automatically convert the resistance value into temperature, which can be achieved by using some existing products on the market. The principle will not be described in detail here.

[0037] Furthermore, the potentiometer unit 2 includes: an A-phase potentiometer assembly 21, a B-phase potentiometer assembly 22, a C-phase potentiometer assembly 23, and an iron core potentiometer assembly 24, all of which are connected to the temperature control box of the dry-type transformer to be calibrated.

[0038] Preferably, the A-phase potentiometer assembly 21 , the B-phase potentiometer assembly 22 , the C-phase potentiometer assembly 23 , and the iron core potentiometer assembly 24 are all triple coaxial potentiometers.

[0039] The A-phase potentiometer assembly 21 includes: an A-phase first potentiometer R11, an A-phase second potentiometer R11, and an A-phase third potentiometer R13; the fixed end of the A-phase first potentiometer R11, the fixed end of the A-phase second potentiometer R12, the sliding end of the A-phase first potentiometer R11, and the sliding end of the A-phase second potentiometer R12 are connected to the temperature control box of the dry-type transformer to be calibrated; the fixed end of the A-phase third potentiometer R13 and the sliding end of the A-phase third potentiometer R13 are connected to the thermometer 1.

[0040] The B-phase potentiometer assembly 22 includes: a B-phase first potentiometer R21, a B-phase second potentiometer R22, and a B-phase third potentiometer R23; the fixed end of the B-phase first potentiometer R21, the fixed end of the B-phase second potentiometer R22, the sliding end of the B-phase first potentiometer R21, and the sliding end of the B-phase second potentiometer R22 are connected to the temperature control box of the dry-type transformer to be calibrated; the fixed end of the B-phase third potentiometer R23 and the sliding end of the B-phase third potentiometer R23 are connected to the thermometer 1.

[0041] The C-phase potentiometer assembly 23 includes: a C-phase first potentiometer R31, a C-phase second potentiometer R32, and a C-phase third potentiometer R33; the fixed end of the C-phase first potentiometer R31, the fixed end of the C-phase second potentiometer R32, the sliding end of the C-phase first potentiometer R31, and the sliding end of the C-phase second potentiometer R32 are connected to the temperature control box of the dry-type transformer to be calibrated; the fixed end of the C-phase third potentiometer R33 and the sliding end of the C-phase third potentiometer R33 are connected to the thermometer 1.

[0042] The iron core potentiometer assembly 24 includes: a first iron core potentiometer R41, a second iron core potentiometer R42, and a third iron core potentiometer R43; the fixed end of the first iron core potentiometer R41, the fixed end of the second iron core potentiometer R42, the sliding end of the first iron core potentiometer R41, and the sliding end of the second iron core potentiometer R42 are connected to the temperature control box 100 of the dry-type transformer to be calibrated; the fixed end of the third iron core potentiometer R43 and the sliding end of the third iron core potentiometer R43 are connected to the thermometer 1.

[0043] Considering that the temperature of each phase inside the dry-type transformer temperature control box requires two resistance values, in the present invention, the dry-type transformer temperature control box 100 to be checked is connected to two potentiometers when implementing each function check.

[0044] like Figure 3 As shown, the thermometer 1 and the potentiometer unit 2 are connected to the transformer temperature control box via a wiring plug 4. Specifically, a 25-pin wiring plug 4 is used to meet the connection between the calibration device and the temperature control box of the dry-type transformer to be calibrated.

[0045] The power supply unit 3 includes: a battery E and a switch K; the battery E is connected to the thermometer 1 via the switch K. The battery E is a rechargeable battery, which is charged by an external charger, and the thermometer 1 is turned on / off controlled by the switch K.

[0046] Next, the present invention will be further described in conjunction with the specific implementation process, as follows:

[0047] 1. Connect the calibration device to the temperature control box of the dry-type transformer to be calibrated through a 25-pin wiring plug.

[0048] 2. Using phase A as an example, adjust the potentiometer assembly for phase A (maintain the other three temperature groups below 90°C). Increase the temperature by turning the knob clockwise. Turn the knob slowly. Note that because the temperature control box for the dry-type transformer being tested has a 10-second delay between each setpoint, turning the knob too quickly may result in the temperature display not being the actual alarm value. Especially when the temperature approaches the alarm threshold, increase the temperature more slowly to avoid skipping the actual alarm threshold. When the displayed temperature reaches 90°C, the fan starts the alarm. At 130°C, the winding overtemperature alarm occurs. At 150°C, the winding overtemperature trip occurs. Real-time temperature readings can be read with a thermometer. If the displayed temperature exceeds 90°C but the fan does not start the alarm, or if the displayed temperature exceeds 130°C but the winding overtemperature alarm does not occur, or if the displayed temperature exceeds 150°C but the winding overtemperature trip does not occur, a fault has occurred.

[0049] 3. Follow this method to make phase B, phase C and iron core.

[0050] 4. After the verification is completed, connect the transformer temperature control box back to the transformer.

[0051] The utility model changes the calibration mode of the temperature control box of the dry-type transformer from qualitative calibration to quantitative calibration, which can improve the operation quality, and the calibration method is more reasonable, accurate and effective in calibrating the protection function board of the temperature control box.

[0052] Compared with the calibration method of the prior art, the utility model has a simpler operation method, can improve the operation efficiency, is easier to operate, and can achieve the calibration purpose by simply rotating the knob. The operation is more efficient and the time for calibrating the temperature control box under the same conditions can be saved by half.

[0053] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A calibration device for a dry-type transformer temperature control box, characterized in that: include: Thermometer, potentiometer unit and power supply unit; The potentiometer unit is connected to the temperature control box of the dry-type transformer to be calibrated and the thermometer; The power supply unit is connected to the thermometer; The potentiometer unit is used to simulate the change of the temperature value to verify the protection function of the dry-type transformer temperature control box to be verified, and the thermometer is used to display the temperature value.

2. The verification device according to claim 1, wherein: The potentiometer unit includes: an A-phase potentiometer assembly, a B-phase potentiometer assembly, a C-phase potentiometer assembly, and an iron core potentiometer assembly, all of which are connected to a temperature control box of a dry-type transformer to be calibrated.

3. The verification device according to claim 2, characterized in that: The A-phase potentiometer assembly, the B-phase potentiometer assembly, the C-phase potentiometer assembly, and the iron core potentiometer assembly are all triple coaxial potentiometers.

4. The verification device according to claim 3, characterized in that: The A-phase potentiometer assembly includes: a first A-phase potentiometer, a second A-phase potentiometer, and a third A-phase potentiometer; The fixed end of the first A-phase potentiometer, the fixed end of the second A-phase potentiometer, the sliding end of the first A-phase potentiometer, and the sliding end of the second A-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated; The fixed end of the third A-phase potentiometer and the sliding end of the third A-phase potentiometer are connected to the thermometer.

5. The verification device according to claim 3, wherein: The B-phase potentiometer assembly includes: a B-phase first potentiometer, a B-phase second potentiometer, and a B-phase third potentiometer; The fixed end of the first B-phase potentiometer, the fixed end of the second B-phase potentiometer, the sliding end of the first B-phase potentiometer, and the sliding end of the second B-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated; The fixed end of the third B-phase potentiometer and the sliding end of the third B-phase potentiometer are connected to the thermometer.

6. The verification device according to claim 3, characterized in that: The C-phase potentiometer assembly includes: a C-phase first potentiometer, a C-phase second potentiometer, and a C-phase third potentiometer; The fixed end of the first C-phase potentiometer, the fixed end of the second C-phase potentiometer, the sliding end of the first C-phase potentiometer, and the sliding end of the second C-phase potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated; The fixed end of the C-phase third potentiometer and the sliding end of the C-phase third potentiometer are connected to the thermometer.

7. The verification device according to claim 3, characterized in that: The iron core potentiometer assembly includes: a first iron core potentiometer, a second iron core potentiometer, and a third iron core potentiometer; The fixed end of the first iron core potentiometer, the fixed end of the second iron core potentiometer, the sliding end of the first iron core potentiometer, and the sliding end of the second iron core potentiometer are connected to the temperature control box of the dry-type transformer to be calibrated; The fixed end of the third iron core potentiometer and the sliding end of the third iron core potentiometer are connected to the thermometer.

8. The verification device according to claim 1, wherein: The thermometer and the potentiometer unit are connected to the transformer temperature control box via a wiring plug.

9. The calibration device according to claim 1, wherein: The power supply unit includes: a battery and a switch; The battery is connected to the thermometer via the switch.

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