Coil temperature measuring mechanism

Abstract

The utility model relates to the technical field of coil temperature measuring equipment, and discloses a coil temperature measuring mechanism, which comprises a stretching-in pipe, a platinum thermal resistance temperature sensor and two thermistor sensors are arranged in the stretching-in pipe, and a connecting cable of the platinum thermal resistance temperature sensor and the two thermistor sensors penetrates through the stretching-in pipe; scale marks are arranged on the outer wall of the stretching-in pipe. According to the utility model, the cable of the temperature measurement sensor and the sensor can be protected, the cable can be arranged at the same time, a worker can conveniently and accurately insert the cable into the corresponding detection depth by using the scale marks on the extension pipe, and the installation operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of coil temperature measuring equipment, in particular to a coil temperature measuring mechanism. Background Art

[0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment, etc. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Dry-type transformers have the advantages of strong short-circuit resistance, low maintenance workload, high operating efficiency, small size, and low noise. They are often used in places with high requirements for fire protection and explosion protection.

[0003] In order to ensure the safe operation of the existing dry-type transformer, a temperature sensor is installed at the coil of the transformer to monitor the coil temperature in real time, thereby monitoring the coil operation status. When the temperature is abnormal, the transformer can be directly shut down by the controller to ensure the safe use of the transformer. The existing dry-type transformer temperature sensor will set up multiple temperature sensors to monitor the temperature of the transformer and perform interlocking safety control. The commonly used one is to use a platinum thermal resistor temperature sensor as the main temperature measurement function, and two more thermistors are set up to perform interlocking control of the over-temperature alarm and over-temperature tripping of the control.

[0004] When installing the three temperature sensors of each coil, the applicant found that:

[0005] 1. Generally, the temperature sensor is directly inserted into the gap between the coil and the shell. The sensor and the sensor cable lack protective devices. The sensor and the connecting cable are easily scratched or damaged by collision. At the same time, the cables of the three sensors lack cable management devices, and the cables are crossed and messy.

[0006] 2. When installing existing sensors, it is difficult to accurately control the insertion depth of the sensor due to the easy bending of the cable, and the accuracy of the detection position cannot be guaranteed.

[0007] In order to solve the above-mentioned problems, a coil temperature measurement mechanism is proposed. Utility Model Content

[0008] The purpose of the utility model is to provide a coil temperature measuring mechanism in order to solve the above-mentioned problem.

[0009] The technical solution adopted by the utility model is as follows: a coil temperature measuring mechanism, comprising an insertion tube, the insertion tube is provided with a platinum thermal resistor temperature sensor and two thermistor sensors fixedly mounted on it, and the connecting cables of the platinum thermal resistor temperature sensor and the two thermistor output sensors pass through the insertion tube;

[0010] The outer wall of the insertion tube is provided with scale lines.

[0011] In a preferred embodiment, the insertion tube can be fixed on the dry-type transformer, and the insertion tube can be inserted into a gap between the coil and the housing of the dry-type transformer.

[0012] In a preferred embodiment, the insertion tube is made of insulating plastic material that is resistant to high temperature and high pressure.

[0013] In a preferred embodiment, the bottom end of the insertion tube is a closed structure.

[0014] In a preferred embodiment, the distance between the platinum thermal resistor temperature sensor and the two thermistor sensors and the bottom end of the insertion tube is greater than or equal to 160 mm.

[0015] In a preferred embodiment, a cable fixing head is fixedly mounted on the upper end of the insertion tube, and connecting cables of the platinum resistance temperature sensor and the two thermistor output sensors are passed through and locked on the cable fixing head.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] 1. In the utility model, the platinum thermal resistor temperature sensor and two thermistor sensors are arranged in the extension tube, so as to protect the temperature sensor body, and then the sensor cables are arranged in the extension tube, so as to protect the sensor cables, so as to avoid collision and scratch damage between the sensor and the transformer structure when personnel install the temperature measuring mechanism, and the use of the extension tube for wiring can realize the orderly wiring of the sensor cables and avoid the cables from crossing and being messy.

[0018] 2. In the utility model, the depth of the gap between the insertion tube and the coil and the shell is controlled by the scale line, so as to ensure the uniformity of the measurement position of the temperature sensor and improve the detection accuracy. In this way, there is no need for personnel to take dimensions for measurement, and the installation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram showing the installation position of the temperature measuring structure in the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the utility model from the front.

[0022] Markings in the figure: 1-insertion tube, 3-platinum resistance temperature sensor, 4-thermistor sensor, 5-scale line, 9-cable fixing head. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0024] The following will be combined Figure 1-Figure 3 A coil temperature measuring mechanism according to an embodiment of the utility model is described in detail.

[0025] Example:

[0026] The present invention provides a coil temperature measuring mechanism, referring to Figures 1 to 3 As shown, it includes an insertion tube 1, the bottom end of the insertion tube 1 is a closed structure, a platinum thermal resistor temperature sensor 3 and two thermistor sensors 4 are arranged in the insertion tube 1, and the connecting cables of the platinum thermal resistor temperature sensor 3 and the two thermistor sensors 4 pass through the insertion tube 1. In this structure, the heat of the coil is conducted into the insertion tube 1, and then the platinum thermal resistor temperature sensor 3 is used mainly to detect the temperature of the coil, and the other two thermistor sensors 4 are used to interlock the over-temperature alarm and over-temperature tripping of the control;

[0027] In the above structure, the platinum resistance temperature sensor 3 and two thermistor sensors 4 are arranged inside the insertion tube, and then the cables of the sensors are arranged in the insertion tube 1, so that the temperature sensor and the sensor cables can be protected, and orderly offline operation can be achieved to avoid cable crossing and disorder.

[0028] It should be noted that the above-mentioned platinum thermistor temperature sensor 3 and the two thermistor sensors 4 are electrically connected to the temperature controller with model number LD-B10-220FC through connecting cables, and the platinum thermistor temperature sensor 3 and the two thermistor sensors 4 are both existing equipment. The model of the platinum thermistor temperature sensor 3 is PT100, and the models of the two thermistor sensors 4 are PTC130 and PTC1150 respectively.

[0029] refer to Figures 1 to 3 As shown, the insertion tube 1 can be fixed on the dry-type transformer, and the insertion tube 1 can be inserted into the gap between the coil and the shell of the dry-type transformer. The outer wall of the insertion tube 1 is provided with a scale line 5. This structure uses the scale line 5 to control the depth of the gap between the insertion tube 1 and the shell, thereby ensuring the uniformity of the measurement position of the temperature sensor and improving the detection accuracy. In this way, there is no need for personnel to take dimensions for measurement, and installation is more convenient.

[0030] refer to Figures 1 to 3As shown, the insertion tube 1 is made of insulating plastic material resistant to high temperature and high pressure, which ensures the insulation and high temperature resistance of the insertion tube 1, thereby meeting the detection requirements of the coil in a high temperature environment.

[0031] refer to Figures 1 to 3 As shown, the distance between the platinum thermal resistor temperature sensor 3 and the two thermistor sensors 4 and the bottom end of the insertion tube is greater than or equal to 160 mm. The above structure ensures the creepage distance between the conductor of the sensor 3 and the coil to avoid discharge and damage to the sensor.

[0032] refer to Figures 1 to 3 As shown, a cable fixing head 9 is fixedly installed on the upper end of the insertion tube 1, and the connecting cables of the platinum resistance temperature sensor 3 and the two thermistor sensors 4 are passed through and locked and fixed on the cable fixing head 9. This structure utilizes the cable fixing head 9 to seal the upper end of the insertion tube 1 and lock the cable of the sensor at the same time, thereby preventing the cable from being pulled and causing the sensor and the connecting cable to be torn and detached.

[0033] It should be noted that the cable fixing head 9 is an existing electrical device, which adopts an M-type cable fixing head. The main structure consists of a locking nut, a seal, a plastic clamping claw, a main body, a protective ring and a nut. The main structure has been disclosed and is not improved, so it is not introduced in detail here.

[0034] It should be noted that the temperature measuring mechanism disclosed in the above embodiment is applied to the coil temperature measurement of a dry-type transformer, and belongs to the field of transformer temperature measuring equipment.

[0035] The implementation principle of a coil temperature measurement mechanism of the embodiment of the present application is as follows: in actual use, the platinum thermal resistor temperature sensor 3 and the two thermistor sensors 4 are arranged in the insertion tube 18 to protect the temperature sensor body, and then the cables of the sensors are arranged in the insertion tube 1, so that the sensor cables can be protected and orderly cable management can be achieved to avoid cable crossing and disorder;

[0036] The upper end of the insertion tube 1 is sealed with the wire fixing head 9, and the cable of the sensor is locked at the same time, so as to prevent the cable from being pulled and causing the sensor and the connecting cable to tear and fall off;

[0037] During installation, the scale line 5 is used to control the depth of the gap between the insertion tube 1 and the coil and the shell, thereby ensuring the uniformity of the measurement position of the temperature sensor and improving the detection accuracy. In this way, there is no need for personnel to take dimensions for measurement, and installation is more convenient.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coil temperature measuring mechanism, comprising an insertion tube (1), characterized in that: A platinum thermal resistor temperature sensor (3) and two thermistor sensors (4) are arranged inside the insertion tube (1), and connecting cables of the platinum thermal resistor temperature sensor (3) and the two thermistor sensors (4) pass through the insertion tube (1); The outer wall of the insertion tube (1) is provided with scale lines (5).

2. A coil temperature measuring mechanism as claimed in claim 1, characterized in that: The insertion tube (1) can be fixed on a dry-type transformer, and the insertion tube (1) can be inserted into a gap between a coil and a shell of the dry-type transformer.

3. A coil temperature measuring mechanism as claimed in claim 1, characterized in that: The insertion tube (1) is made of insulating plastic material that is resistant to high temperature and high pressure.

4. A coil temperature measuring mechanism as claimed in claim 1, characterized in that: The bottom end of the insertion tube (1) is a closed structure.

5. A coil temperature measuring mechanism as claimed in claim 1, characterized in that: The distance between the platinum thermal resistor temperature sensor (3) and the two thermistor sensors (4) and the bottom end of the insertion tube is greater than or equal to 160 mm.

6. A coil temperature measuring mechanism as claimed in claim 1, characterized in that: A cable fixing head (9) is fixedly mounted on the upper end of the insertion tube (1), and connecting cables of the platinum thermal resistor temperature sensor (3) and the two thermistor sensors (4) are passed through and locked on the cable fixing head (9).

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