Special instrument for checking temperature of temperature control box of dry-type transformer

Abstract

The utility model discloses a special instrument for verifying the temperature of a temperature control box of a dry-type transformer, which relates to the technical field of temperature verification of temperature control boxes and comprises a sensor plug which is electrically plugged with the temperature control box of the dry-type transformer. A transmission line; the resistance adjustable device is connected with the sensor plug through a transmission line, and the resistance adjustable device is connected with the dry-type transformer temperature control box control panel through the transmission line and the sensor plug. According to the utility model, the resistance adjustable device is connected with the control panel of the temperature control box through the sensor plug and the transmission line, the resistance values connected to the A, B and C phases of the temperature control box and the iron core control loop are changed by adjusting the corresponding potentiometers, and the transformer temperature collected by the temperature sensor PT100 is simulated, so that the temperature control box displays the corresponding temperature values; the operation is convenient and fast, the control of 0.1 DEG C display of the temperature control box can be realized, and the adjustment precision is high.

Description

Technical Field

[0001] This utility model relates to the field of temperature calibration technology for temperature control boxes, and in particular to a special instrument for calibrating the temperature of a dry-type transformer temperature control box. Background Technology

[0002] The safe operation and service life of a dry-type transformer largely depend on the reliability of its winding insulation. Excessive transformer temperature can, at best, damage the insulation performance of the windings and reduce the transformer's lifespan; at worst, it can cause insulation breakdown, burnout, or even explosion. Therefore, high temperature is one of the main causes of transformer malfunction. To ensure the long-term stable operation of dry-type transformers, a temperature controller is needed to monitor and control the transformer's temperature in real time.

[0003] The main function of a transformer temperature controller is to monitor and control the temperature of the transformer, preventing it from overheating. A temperature control box is an automatic control device composed of temperature-sensing elements, a control circuit, and an output device. The temperature of the transformer windings and core is collected by a platinum resistance thermometer (PT100) and a thermistor (PTC), utilizing the basic principle that their resistance changes with temperature. Changes in winding temperature cause changes in their resistance. The temperature control box converts this resistance value into a voltage signal and sends it to the control circuit. The control circuit then compares this with preset temperature values. When the temperature of any one of the three phases (A, B, and C) of the transformer winding exceeds 130℃, the temperature control box issues an over-temperature alarm signal; when the temperature of any one of the three phases exceeds 150℃, the temperature control box issues an over-temperature trip signal and a trip command. When the transformer core temperature exceeds 130℃, the temperature control box issues an over-temperature alarm signal. Therefore, a transformer temperature controller can achieve real-time monitoring and automatic control of the transformer winding and core temperatures to ensure the safe and stable operation of the transformer.

[0004] The safe and stable operation of a transformer relies heavily on its temperature control box. To ensure the box functions correctly and issues alarm signals or trip commands when the transformer temperature reaches a certain threshold, regular calibration is necessary. However, currently, there are no dedicated testing instruments for calibrating the temperature of dry-type transformer temperature control boxes. Existing testing tools, such as manufacturer-provided test heads, suffer from inconvenient operation and poor temperature adjustment accuracy, failing to meet actual temperature control box calibration requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a special instrument for temperature calibration of dry-type transformer temperature control boxes, so as to solve the problem mentioned in the background art that there is no special testing instrument for temperature calibration of dry-type transformer temperature control boxes in the prior art.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A special instrument for temperature calibration of a dry-type transformer temperature control box, including

[0008] A sensor plug, which is electrically connected to the dry-type transformer temperature control box;

[0009] Transmission lines;

[0010] An adjustable resistance device is provided, which is connected to a sensor plug via a transmission line, and is also connected to the control board of the dry-type transformer temperature control box via the transmission line and the sensor plug.

[0011] Preferably, the sensor plug includes a housing and a circuit board disposed inside the housing. The end of the housing is also provided with a male plug that is electrically connected to the circuit board. The outside of the dry-type transformer temperature control box is provided with a female plug that is electrically connected to its internal control board. The male plug and the female plug are plugged into each other.

[0012] Preferably, the outer shell is made of ABS engineering plastic, the circuit board is a PCB printed circuit board, and the male plug is a DB25 wire bonding type male plug.

[0013] Preferably, the transmission line has connectors at both ends for connecting to the sensor plug and the adjustable resistor, respectively. The connectors are GX16 wired aviation double-ended male and female connectors.

[0014] Preferably, the adjustable resistor device includes a junction box, a potentiometer, and a metal film resistor. The junction box has a mounting slot on its upper wall, the potentiometer is connected to the mounting slot, the metal film resistor is installed inside the junction box, and the potentiometer and the metal film resistor are connected by a wire.

[0015] Preferably, there are four potentiometers, each corresponding to a resistance value used to adjust the resistance values ​​connected to the A, B, and C phases of the temperature control box and the iron core control circuit, and the specification number of the potentiometers is 3590-2-102202.

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

[0017] This invention connects an adjustable resistance device to the temperature control box control board via a sensor plug and transmission line. By adjusting the corresponding potentiometer, the resistance values ​​connected to the A, B, and C phases and the iron core control circuit of the temperature control box are changed, simulating the transformer temperature collected by the PT100 temperature sensor, so that the temperature control box displays the corresponding temperature value. This achieves the purpose of verifying the alarm and tripping temperature of the temperature control box. The operation is convenient and quick, and the temperature control box can be controlled to display 0.1℃, with high adjustment accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external overall structure of a special instrument for temperature calibration of a dry-type transformer temperature control box;

[0019] Figure 2 A first-view structural schematic diagram of a special instrument for temperature calibration of a dry transformer temperature control box;

[0020] Figure 3 This is a schematic diagram of the adjustable resistance device of a special instrument for temperature calibration of a dry-type transformer temperature control box.

[0021] Figure 4 This is a circuit diagram of a special instrument for temperature calibration of a dry-type transformer temperature control box.

[0022] Figure 5 This is a schematic diagram of the front of the circuit board of a special instrument for temperature calibration of a dry-type transformer temperature control box.

[0023] Figure 6 This is a schematic diagram of the back of the circuit board of a special instrument for temperature calibration of a dry-type transformer temperature control box.

[0024] In the diagram: 1. Sensor plug; 11. Housing; 12. Circuit board; 13. Male plug; 2. Transmission line; 3. Adjustable resistor; 31. Junction box; 32. Potentiometer; 33. Metal film resistor. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] Please see Figures 1-6 As shown, this utility model is a special instrument for temperature calibration of a dry-type transformer temperature control box, including...

[0028] Sensor plug 1, which is electrically connected to the dry-type transformer temperature control box;

[0029] Transmission line 2;

[0030] The adjustable resistance device 3 is connected to the sensor plug 1 via a transmission line 2, and the adjustable resistance device 3 is connected to the control board of the dry-type transformer temperature control box via the transmission line 2 and the sensor plug 1.

[0031] The sensor plug 1 includes a housing 11 and a circuit board 12 disposed inside the housing 11. The end of the housing 11 is also provided with a male plug 13 that is electrically connected to the circuit board 12. The outside of the dry transformer temperature control box is provided with a female plug that is electrically connected to its internal control board. The male plug 13 is plugged into the female plug.

[0032] The outer shell 11 is made of ABS engineering plastic, the circuit board 12 is a PCB printed circuit board, and the male plug 13 is a DB25 wire bonding male plug.

[0033] The transmission line 2 is provided with connectors at both ends for connecting to the sensor plug 1 and the resistance adjustable device 3 respectively. The connectors are GX16 wired aviation double-ended male and female connectors.

[0034] The adjustable resistance device 3 includes a junction box 31, a potentiometer 32, and a metal film resistor 33. The junction box 31 has an installation slot on its upper wall. The potentiometer 32 is connected to the installation slot. The metal film resistor 33 is installed inside the junction box 31, and the potentiometer 32 and the metal film resistor 33 are connected by wires.

[0035] There are four potentiometers 32, which are respectively used to adjust the resistance values ​​of the A, B, and C phases of the temperature control box and the iron core control circuit. The specification number of the potentiometer 32 is 3590-2-102202.

[0036] The DB25 solderable male connector is a model of male connector 13 with 25 pins, which can be soldered to connect wires or cables to the connector.

[0037] As can be seen from the above, the adjustable resistance device 3 is connected to the temperature control box control board through the sensor plug 1 and the transmission line 2. By adjusting the corresponding potentiometer 32, the resistance values ​​connected to the A, B, C phases and the iron core control circuit of the temperature control box are changed, simulating the transformer temperature collected by the temperature sensor PT100, so that the temperature control box displays the corresponding temperature value, so as to achieve the purpose of verifying the alarm and trip temperature of the temperature control box. The operation is convenient and quick, and the temperature control box can be controlled to display 0.1℃, with high adjustment accuracy.

[0038] Example 2:

[0039] Depend on Figures 1-6 As can be seen, the calibration instrument is installed according to the schematic diagram. The junction box 31 has dimensions of 158*90*46mm. After assembly, the male plug 13 is connected to the female plug on the outside of the dry-type transformer temperature control box, which is electrically connected to its internal control board. Then, by rotating the four potentiometers 32, the resistance values ​​connected to the A, B, and C phases and the core control circuit of the temperature control box are changed, so that the temperature control box displays the corresponding temperature value, thereby achieving the purpose of calibrating the alarm and trip temperature of the temperature control box. The test results are shown in Table 1, which is the calibration table for the alarm and trip temperature of the temperature control box.

[0040] Test Project standard 1st time 2nd time 3rd accuracy Phase A over-temperature alarm 130℃ 130.1℃ 130.2℃ 130.1℃ 100％ Phase B over-temperature alarm 130℃ 130.2℃ 130.2℃ 130.1℃ 100％ C-phase over-temperature alarm 130℃ 130.1℃ 130.2℃ 130.3℃ 100％ Iron core over-temperature alarm 130℃ 130.2℃ 130.3℃ 130.3℃ 100％ Phase A overheating tripped the circuit breaker. 150℃ 150.2℃ 150.3℃ 150.1℃ 100％ Phase B overheating tripped the circuit breaker. 150℃ 150.2℃ 150.2℃ 150.1℃ 100％ C-phase overheating tripped the circuit breaker. 150℃ 150.3℃ 150.1℃ 150.2℃ 100％

[0041] All of the above test results met the standards and requirements.

[0042] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A special instrument for temperature calibration of a dry-type transformer temperature control box, characterized in that: Sensor plug (1) is electrically connected with dry transformer temperature control box, and transmission line (2) is arranged between sensor plug (1) and dry transformer temperature control box. Resistance adjustable device (3) is connected with sensor plug (1) through transmission line (2), and resistance adjustable device (3) is connected with dry transformer temperature control box control panel through transmission line (2) and sensor plug (1). Resistance adjustable device (3) includes junction box (31), potentiometer (32) and metal film resistor (33), the upper wall of junction box (31) is provided with mounting slot hole, potentiometer (32) is connected with mounting slot hole, metal film resistor (33) is installed in the inside of junction box (31), and potentiometer (32) and metal film resistor (33) are connected through wires.

2. The temperature calibration instrument for dry-type transformer temperature control box according to claim 1, characterized in that: Sensor plug (1) includes shell (11) and circuit board (12) arranged in the inside of shell (11), the end of shell (11) is further provided with male plug (13) electrically connected with circuit board (12), the outside of dry transformer temperature control box is provided with female plug electrically connected with the inside control panel, male plug (13) is inserted and connected with female plug.

3. The temperature calibration instrument for dry-type transformer temperature control box according to claim 2, characterized in that: The material of shell (11) is ABS engineering plastic, the circuit board (12) is PCB printed circuit board, and the model of male plug (13) is DB25 soldering wire type male plug.

4. The temperature calibration instrument for dry-type transformer temperature control box according to claim 1, characterized in that: The two ends of transmission line (2) are provided with connectors respectively connected with sensor plug (1) and resistance adjustable device (3), and the model of connector is GX16 wire aviation double-head male and female connector.

5. The temperature calibration instrument for dry-type transformer temperature control box according to claim 1, characterized in that: Potentiometer (32) is provided with four, four potentiometers (32) are respectively used for adjusting resistance value connected with A, B, C phase and iron core control loop of temperature control box, and the specification number of potentiometer (32) is 3590-2-102 202.

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