Thermometer calibration test bench
By designing a dedicated temperature gauge calibration test bench and employing a PLC controller and hook structure, simultaneous calibration of multiple transformer temperature gauges was achieved, improving calibration efficiency and solving the problem of low efficiency in existing technologies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-03-24
AI Technical Summary
Existing technologies for batch calibration of transformer thermometers are inefficient, as they cannot test multiple thermometers simultaneously, resulting in low calibration efficiency.
Design a temperature gauge calibration test bench. The bench is a dedicated test bench that suspends transformer temperature gauges via hooks. It is equipped with a PLC controller, expansion modules, digital input modules, signal board communication modules, and a PC human-machine interface to enable simultaneous calibration of multiple transformer temperature gauges.
It improves the calibration efficiency of large-volume transformer thermometers by using a quick-connect plug and hook structure to enable rapid positioning and testing of multiple thermometers, thus solving the inefficiency problem of single-unit calibration mode.
Smart Images
Figure CN224034810U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of temperature gauge calibration technology, and in particular relates to a temperature gauge calibration test bench. Background Technology
[0002] Transformer thermometers are important measuring instruments primarily used to monitor the operating status of transformers. Winding temperature plays a decisive role in the aging of insulation materials, and thermometers are used to measure the temperature of large and medium-sized transformers used in the system. Transformer thermometers are instruments used to measure and record temperature changes in transformer windings, and typically possess high accuracy and reliability.
[0003] The accuracy of a thermometer directly affects the accuracy and reliability of temperature measurements, therefore it is essential to maintain its good operating condition. Regular inspection of thermometers is crucial: Over long-term use, thermometers are affected by various factors such as environmental conditions, frequency of use, and transportation, leading to a decrease in accuracy. Therefore, thermometers require regular inspection to ensure their accuracy and stability, typically annually or semi-annually, depending on usage.
[0004] There are two methods for testing thermometers: self-test and calibration. Self-test involves comparing the measured temperature with a known temperature to determine the thermometer's accuracy. Calibration involves connecting the thermometer to a known accurate temperature measuring device and comparing their readings to determine its accuracy. Different types and accuracies of thermometers require different calibration methods; for example, high-precision thermometers need to be calibrated under constant temperature conditions.
[0005] Currently, the method for calibrating transformer temperature gauges in batches is to test them one by one, which is very inefficient. There is a need to design a device for calibrating transformer temperature gauges in batches. Utility Model Content
[0006] The purpose of this invention is to provide a temperature gauge calibration test bench that overcomes the shortcomings of existing technologies. It adopts a dedicated test bench that can test multiple transformer temperature gauges simultaneously. The transformer temperature gauges are held in a specific position on the test bench by hooks. The test bench panel is equipped with a quick-connect plug, which improves the efficiency of calibration tests for large batches of transformer temperature gauges.
[0007] To achieve the above objectives, this utility model employs the following technical solution:
[0008] The thermometer calibration test bench includes a housing, a panel, a PC human-machine interface, a standard electronic thermometer, and a constant temperature oil bath. An operating table is located below the panel. The panel is vertical and has several hooks along its upper edge. The hooks are shaped to match the suspension structure of the thermometers on the transformer under test. Each transformer thermometer has an aviation socket below its suspension position. The housing contains a PLC controller, which is equipped with an expansion module, a digital input module, and a signal board communication module. Hinged doors are located on the rear of the housing and below the operating table. An instrument panel is located below the panel, containing several sets of 4-86 type sockets and ammeters. Each transformer thermometer corresponds to one set of 86 type sockets and ammeters.
[0009] Furthermore, the PLC controller is a Siemens PLC CPU 1212C module controller.
[0010] Furthermore, the expansion module is a Siemens 6ES7212-1AE40-0XB0.
[0011] Furthermore, the model number of the signal board communication module is 6ES7241-1CH30-1XB0.
[0012] Furthermore, the digital input module is a Siemens 6ES7221-1BH32-0XB0.
[0013] Furthermore, the PC human-machine interface is a touch screen all-in-one machine, model Siemens WINCC.
[0014] Furthermore, the model number of the standard electronic thermometer is DM3068.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1) A dedicated test bench is used, which can test multiple transformer temperature gauges at the same time. The transformer temperature gauges are quickly positioned on the test bench via hooks and can maintain a specific position.
[0017] 2) The test bench is equipped with a quick-connect plug, which can significantly improve the testing efficiency of large batches of transformer temperature gauges and solve the problem of inefficiency in the calibration mode of a single transformer temperature gauge. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0019] Figure 2 yes Figure 1 The left view;
[0020] Figure 3 yes Figure 1 Rear view;
[0021] Figure 4 This is a wiring diagram of the PLC controller according to an embodiment of this utility model.
[0022] In the diagram: 1-box, 2-panel, 3-operating table, 4-hook, 5-thermometer for transformer under test, 6-aviation socket, 7-instrument panel, 8-type 86 socket, 9-ammeter, 10-standard electronic thermometer, 11-wiring hole, 20-constant temperature oil bath, 21-PC human-machine interface. Detailed Implementation
[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.
[0025] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.
[0026] See Figure 1-4 This is a schematic diagram of the structure of an embodiment of the thermometer calibration test bench of this utility model, including a box body 1, a panel 2, a PC human-machine interface 21, a standard electronic thermometer 10 and a constant temperature oil bath 20. An operating table 3 is provided below the panel 2. The panel 2 is a vertical panel 2. Several hooks 4 are provided along the upper edge of the panel 2. The shape of the hooks 4 matches the suspension structure of the transformer thermometer 5 to be tested. An aviation socket 6 is provided below each suspension position of the transformer thermometer 5.
[0027] The enclosure 1 houses a PLC controller, which is equipped with an expansion module, a digital input module, and a signal board communication module. Hinged doors are located on the rear of enclosure 1 and below the control panel 3. An instrument panel 7 is located below the control panel 2, and the instrument panel 7 has several sets of 86-type sockets 8 and ammeters 9. Each transformer temperature gauge 5 corresponds to one set of 86-type sockets 8 and ammeters 9. Three wiring holes 11 are located on the rear of enclosure 1, and each wiring hole 11 is fitted with a rubber plug.
[0028] In this embodiment, the PLC controller is a Siemens PLC CPU 1212C module controller. The expansion module is a Siemens 6ES7212-1AE40-0XB0. The signal board communication module is a 6ES7241-1CH30-1XB0. The digital input module is a Siemens 6ES7221-1BH32-0XB0. The PC human-machine interface is a touch screen all-in-one machine, model Siemens WINCC.
[0029] The standard electronic thermometer 10 is model DM3068. The constant temperature oil bath is model DC-301511.
[0030] In operation, the thermometer of the transformer under test is first fixed on the test bench, allowing for the testing of 1-4 units at a time. The temperature sensing element of the thermometer 5 is inserted into the test hole of the constant temperature oil bath 20. Then, the PC human-machine interface 21, the housing 1, the standard electronic thermometer 10, and the constant temperature oil bath 20 are powered on. After the system starts up, the test curve for the thermometer 5 is set on the PC human-machine interface 21 of the control system. After setting, the start test button is clicked, and the test system controls the constant temperature oil bath to heat up and cool down according to the set curve. When the temperature reaches the preset calibration point, the temperatures of the thermometer 5 and the standard electronic thermometer 10 are recorded, completing the test of the transformer thermometer.
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. Temperature gauge calibration test bench, characterized in that, The box, the panel, the PC man-machine interface, the standard electronic temperature table and the constant temperature oil bath box are included, the operation table is arranged below the panel, the panel is a vertical panel, a plurality of hooks are arranged along the panel, the shape of the hook is matched with the suspension structure of the transformer temperature table to be measured, and an aviation socket is arranged below each transformer temperature table suspension position; the PLC controller is arranged in the box, the PLC controller is connected with an expansion module, a digital quantity input module and a signal plate communication module in a matched mode; the rear side of the box and the lower side of the operation table are both provided with a vertical hinged door; the panel is provided with a panel below the panel, and a plurality of groups of 86 type sockets and ammeters are arranged on the panel, and each transformer temperature table corresponds to a group of 86 type sockets and ammeters.
2. The temperature meter calibration test bench of claim 1, wherein, The PLC controller is a Siemens PLC CPU 1212C module controller.
3. The temperature meter calibration test bench of claim 1, wherein, The expansion module is a Siemens 6ES7212-1AE40-0XB0.
4. The temperature meter calibration test bench of claim 1, wherein, The signal plate communication module is a 6ES7241-1CH30-1XB0.
5. The temperature meter calibration test stand of claim 1, wherein, The digital quantity input module is a Siemens 6ES7221-1BH32-0XB0.
6. The temperature meter calibration test stand of claim 1, wherein, The PC man-machine interface is a touch all-in-one machine, and the model is a Siemens WINCC.
7. The temperature meter calibration test stand of claim 1, wherein, The model of the standard electronic temperature table is DM3068.