Temperature measurement sensor for stator core

Abstract

The utility model discloses a stator core temperature measurement sensor, which comprises a shell, a plurality of temperature sensing elements are arranged in the shell, wires of the plurality of temperature sensing elements are connected with a cable, the cable is provided with a shielding outgoing line, the shielding outgoing line is grounded, and the outer sides of the wires of the plurality of temperature sensing elements are sleeved with sleeves; according to the design, the accuracy and stability of temperature monitoring of the temperature sensing elements are ensured through the arrangement of the plurality of temperature sensing elements, and meanwhile, the temperature sensing elements, the wires and the like can be protected through the shell, the sleeve and other parts, so that the stability and accuracy of the temperature measurement sensor can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature measurement sensors, in particular to a stator core temperature measurement sensor. BACKGROUND

[0002] The RTD (Resistance Temperature Detector) is a temperature sensor that measures temperature by using the characteristic that the resistance value of a metal conductor changes with temperature. For stator core temperature measurement, it can accurately measure the temperature of the stator core, which is very important in the operation monitoring of electrical equipment.

[0003] The specific parts of a large generator set stator, such as the coil layers, stator core, and pressure plate, are usually designed to install a certain number of temperature sensors to monitor the temperature changes of these parts, so as to monitor whether the entire unit is in a normal and reliable operating state. After the unit has been running for a period of time, various factors such as vibration, heat generation, magnetic field, and electric field may cause the temperature measurement sensor to have faults such as broken resistance or large measurement error. This poses a great risk and hidden danger to the safe and reliable operation of the unit. In this case, in order to enable the temperature measurement sensor to continue monitoring the entire unit, a more stable and reliable sensor is needed, and therefore a stator core temperature measurement sensor needs to be designed. CONTENT OF THE INVENTION

[0004] The main purpose of the present application is to provide a stator core temperature measurement sensor to solve the problem of instability and frequent failure of existing temperature measurement sensors.

[0005] To achieve the above-mentioned purpose, the stator core temperature measurement sensor provided by the present application comprises a shell, a plurality of temperature sensing elements are arranged in the shell, a wire connecting cable of the plurality of temperature sensing elements, a shielding lead-out wire is arranged on the cable, the shielding lead-out wire is grounded, and a sleeve is sleeved outside the wire of the plurality of temperature sensing elements.

[0006] Optionally, the shell comprises a bottom plate and a cover plate, a recess is formed on the bottom plate corresponding to the temperature sensing element, the temperature sensing element is installed in the recess, and the cover plate is arranged outside the recess.

[0007] Optionally, the shell is a rectangular structure made of insulating material.

[0008] Optionally, the temperature sensing element is provided in two, and the temperature sensing element is a temperature sensing resistor.

[0009] Optionally, the temperature sensing resistor is a three-wire temperature sensing resistor.

[0010] Optionally, both of the temperature sensing elements are arranged near the first end in the shell, and the wire extends from the second end of the shell.

[0011] Optionally, the length of the shell is 130mm, the width of the shell is 16mm, the height of the shell is 6mm, and the length of the cable is 22m.

[0012] Optionally, one of the temperature sensing elements is arranged near the first end in the shell, and the other temperature sensing element is arranged near the second end in the shell, and the wire extends from the middle of the first end and the second end of the shell.

[0013] Optionally, a coating is arranged on the outer side of the shell, and the coating is used to reduce corona.

[0014] Optionally, the length of the shell is 200mm, the width of the shell is 24.2mm, the height of the shell is 3.5mm, and the length of the cable is 22m.

[0015] The technical scheme of the present application can protect the temperature sensing elements by arranging multiple temperature sensing elements in the shell, and can ensure the accuracy of the monitoring data by simultaneously monitoring the temperature of the multiple temperature sensing elements. In addition, one of the temperature sensing elements can be used for detection, and the others can be used as backups. When one of the temperature sensing elements fails, the other temperature sensing elements can replace the failed temperature sensing element to continue monitoring the temperature. The wires of the multiple temperature sensing elements are connected to a cable, and a shielding lead is arranged on the cable. The shielding lead is grounded and can resist electromagnetic interference. The wires of the multiple temperature sensing elements are sleeved with a sleeve, and the sleeve can stabilize, isolate and insulate the wires. The design of multiple temperature sensing elements ensures the accuracy and stability of temperature monitoring. In addition, the shell and the sleeve can protect the temperature sensing elements and the wires, thereby effectively improving the stability and accuracy of the temperature sensor. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a first embodiment of a stator core temperature sensor of the present application;

[0018] Figure 2Structure diagram of a second embodiment of a stator core temperature measuring sensor of the present application.

[0019] Explanation of reference numerals:

[0020] 1, housing; 101, cover plate; 102, adhesive layer; 103, bottom plate; 2, temperature sensing element; 201, lead wire; 3, cable; 301, shielded lead; 4, sleeve; 5, heat shrink tube.

[0021] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0025] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0026] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0027] Specific locations on the stator of large generator sets, such as between coil layers, the stator core, and the pressure plate, are typically equipped with a number of temperature sensors to monitor temperature changes and thus ensure the entire unit is operating reliably. After a period of operation, various factors such as vibration, heat generation, magnetic fields, and electric fields can cause temperature sensors to malfunction, leading to broken wires or large measurement errors. This poses a significant risk and hazard to the safe and reliable operation of the unit. Therefore, to ensure the temperature sensors can continue monitoring the entire unit, a more stable and reliable sensor is needed; hence, a stator core temperature sensor needs to be designed.

[0028] In view of this, this application proposes a stator core temperature sensor.

[0029] In the first embodiment of the stator core temperature sensor of this application, reference is made to... Figure 1The device includes: a housing 1, multiple temperature sensing elements 2 inside the housing 1, wires 201 of the multiple temperature sensing elements 2 connected to a cable 3, a shielded lead wire 301 on the cable 3, the shielded lead wire 301 being grounded, and a sleeve 4 covering the outside of the wires 201 of the multiple temperature sensing elements 2; the housing 1 can protect the temperature sensing elements 2, the multiple temperature sensing elements 2 can monitor the temperature simultaneously to ensure the accuracy of the monitoring data, or one of them can be used for detection while the others are used as backups. When one temperature sensing element 2 fails, the other temperature sensing elements 2 can take over the faulty temperature sensing element 2 and continue to monitor the temperature. The grounded shielded lead wire 301 can play a role in resisting electromagnetic interference, and the sleeve 4 can provide stable isolation and insulation for the wires 201.

[0030] refer to Figure 1 Heat shrink tubing 5 is fitted at the connection point between cable 3 and the wire 201 of temperature sensing element 2, as well as at the other end of cable 3, to protect the wire 201 and cable 3 and to provide high-temperature insulation.

[0031] refer to Figure 1 The housing 1 includes a base plate 103 and a cover plate 101. A groove is provided on the base plate 103 corresponding to the temperature sensing element 2. The temperature sensing element 2 is installed in the groove. The cover plate 101 is provided on the outside of the groove. The cover plate 101 and the base plate 103 are sealed together by an adhesive layer 102, which makes it easy to put the temperature sensing element 2 into the groove of the base plate 103 and seal the cover plate 101 and the base plate 103 together by the adhesive layer 102. This keeps the temperature sensing element 2 in a closed space in the housing 1, which can prevent external water, oxygen, dust and other substances from coming into contact with the temperature sensing element 2, thus providing better protection for the temperature sensing element 2.

[0032] Specifically, the housing 1 is a rectangular structure made of insulating and thermally conductive material, such as alumina ceramic or aluminum nitride ceramic. Both alumina ceramic and aluminum nitride ceramic have excellent electrical insulation properties, high thermal conductivity, and stable chemical properties. Among them, the housing 1 made of alumina ceramic can effectively prevent leakage under high voltage conditions, ensuring that the internal components of the temperature sensing resistor RTD are electrically isolated from the outside world. This provides a safe and reliable guarantee for core temperature measurement under high electric field strength conditions. It can effectively conduct the heat of the core to the temperature sensing element inside the RTD, making the temperature measurement response more timely and preventing measurement lag due to slow heat conduction. Thus, it can more accurately reflect the temperature change of the core.

[0033] refer to Figure 1 Two temperature sensing elements 2 are configured. Each temperature sensing element 2 is a temperature-sensing resistor. The two temperature sensing elements 2 can monitor the temperature simultaneously to ensure the accuracy of the monitoring data. Alternatively, one of them can be used for detection while the other is used as a backup. In addition, the configuration of two temperature sensing elements 2 can also avoid the problem of high sensor cost.

[0034] Specifically, the temperature sensing resistor is a three-wire type and conforms to the requirements of JB / T10500.1--2019 and JB / T10500.2--2019. Specifically, it can be:

[0035] Model: TST-PT100-2 / 3-426 / SY22 (Iron Core Temperature Measuring Resistor);

[0036] Accuracy class: Class B accuracy;

[0037] Wiring system: Three-wire system;

[0038] Insulation class: F (155℃);

[0039] Temperature range: 0℃~180℃;

[0040] Lead cable: 22 m in length, oil-resistant, high-temperature resistant, crack-resistant, power frequency interference resistant, corona resistant, and high insulation;

[0041] Insulation resistance: DC500V > 100MΩ;

[0042] Planar pressure resistance: 2MPa;

[0043] Withstand voltage: 50HZ, AC1500V.

[0044] refer to Figure 1 Both temperature sensing elements 2 are located near the first end of the housing 1. The wire 201 extends from the second end of the housing 1, so that the two temperature sensing elements 2 can simultaneously monitor the temperature change at similar locations. Since the two temperature sensing elements 2 are relatively close, they can almost simultaneously sense the external heat temperature, and the monitored temperatures are almost the same.

[0045] Specifically, the length of housing 1 is 130mm, the width of housing 1 is 16mm, the height of housing 1 is 6mm, and the length of cable 3 is 22m. The size of housing 1 can adapt to the corresponding wire groove of the iron core. The length of cable 3 allows cable 3 to be led out from the ventilation groove to the outside of the iron core and then to the ring plate on the base without intermediate transfer, and can directly reach the terminal box on the outer wall of the base.

[0046] In the second embodiment of the stator core temperature sensor of this application, reference is made to... Figure 2Compared to the solution in the first embodiment, the difference lies in that: one temperature sensing element 2 is located near the first end inside the housing 1, and the other temperature sensing element 2 is located near the second end inside the housing 1. The wire 201 extends from the middle position between the first end and the second end of the housing 1. This allows the two temperature sensing elements 2 to monitor temperature changes at two relatively far locations. Since the distance between the two temperature sensing elements 2 is relatively far, the time and stability of the two temperature sensing elements 2 in sensing external heat and temperature will differ. It is necessary to estimate the temperature at the location of the other temperature sensing element 2 based on the distance between the two temperature sensing elements 2. At the same time, the two temperature sensing elements 2 can also monitor temperature changes over a wider range. In addition, when one section of the housing 1 is subjected to external force, the temperature sensing element 2 located at the other end of the housing 1 can still work normally.

[0047] Specifically, the outer side of the housing 1 is covered with a coating, which is an anti-corona paint. The coating can reduce corona phenomena and prevent the main insulation from being electro-corroded.

[0048] Specifically, the length of housing 1 is 200mm, the width of housing 1 is 24.2mm, the height of housing 1 is 3.5mm, and the length of cable 3 is 22m. The dimensions of housing 1 are matched with the installation dimensions of the corresponding wire groove of the iron core. The length of cable 3 allows cable 3 to be led out from the ventilation groove to the outside of the iron core and then to the ring plate on the base without intermediate transfer, and can reach the terminal box on the outer wall of the base directly.

[0049] This application's technical solution incorporates multiple temperature-sensing elements within a housing. The housing protects these elements, allowing for simultaneous temperature monitoring to ensure data accuracy. Alternatively, one element can perform the monitoring while others serve as backups. If one element fails, the others can take over and continue monitoring. The wires connecting the multiple elements are connected by a cable with shielded leads that are grounded to prevent electromagnetic interference. The wires are also encased in a sheath for stable isolation and insulation. This design, by incorporating multiple temperature-sensing elements, ensures accurate and stable temperature monitoring. Furthermore, the housing and sheaths protect the elements and wires, effectively improving the stability and accuracy of the temperature sensor.

[0050] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A stator core temperature sensor, characterized in that, include: The housing contains multiple temperature sensing elements, and the wires of the multiple temperature sensing elements are connected to a cable. The cable is provided with a shielded lead wire, which is grounded. The wires of the multiple temperature sensing elements are fitted with a sleeve.

2. The stator core temperature sensor as described in claim 1, characterized in that, The housing includes a base plate and a cover plate. A groove is provided on the base plate corresponding to the temperature sensing element. The temperature sensing element is installed in the groove. The cover plate is disposed on the outside of the groove. The cover plate and the base plate are sealed together by an adhesive layer.

3. The stator core temperature sensor as described in claim 1, characterized in that, The shell is a rectangular structure made of insulating material.

4. The stator core temperature sensor as described in claim 3, characterized in that, The temperature sensing element is configured as two elements, and the temperature sensing element is a temperature sensing resistor.

5. The stator core temperature sensor as described in claim 4, characterized in that, The temperature sensing resistor is a three-wire temperature sensing resistor.

6. The stator core temperature sensor as described in claim 4, characterized in that, Both temperature sensing elements are located near the first end inside the housing, and the wire extends from the second end of the housing.

7. The stator core temperature sensor as described in claim 6, characterized in that, The housing has a length of 130mm, a width of 16mm, a height of 6mm, and a cable length of 22m.

8. The stator core temperature sensor as described in claim 4, characterized in that, One of the temperature sensing elements is located near the first end inside the housing, and the other temperature sensing element is located near the second end inside the housing. The wire extends from the middle position between the first end and the second end of the housing.

9. The stator core temperature sensor as described in claim 8, characterized in that, The outer side of the housing is covered with a coating that reduces corona discharge.

10. The stator core temperature sensor as described in claim 9, characterized in that, The length of the housing is 200mm, the width of the housing is 24.2mm, the height of the housing is 3.5mm, and the length of the cable is 22m.

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