A temperature measuring device and measuring system for power transformer capable of online verification

Abstract

The present application discloses a temperature measuring device for an electric transformer that can be verified online, including a thermometer, a first sensor, a second sensor and a transmitter. The thermometer is used to detect and display the operating temperature of the electric transformer. The first sensor is used to detect the operating temperature of the electric transformer. The second sensor is used to detect the operating temperature of the electric transformer. The transmitter has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are respectively connected to the first sensor and the second sensor, and the transmitter is used to process and transmit the detection data of the first sensor and the second sensor. The temperature measuring device of the present application allows the inspector to compare the data of the transmitter with the data of the thermometer, realize periodic inspection under energized conditions, improve the efficiency and quality of periodic inspection, and solve the contradiction between the metrological verification cycle and the operation and maintenance inspection cycle of the substation.

Description

Technical Field

[0001] The present application relates to the technical field of power transformers, and in particular to a temperature measuring device and a measuring system for a power transformer capable of online verification. Background Art

[0002] The reliability of transformer thermal protection is closely related to the accuracy of the thermometer. How to accurately obtain the real transformer operating temperature data at the substation site and scientifically define the actual accuracy level of the thermometer in use is very important to ensure the safe operation of the transformer.

[0003] JJG 310-2002 "Pressure Thermometer Calibration Procedure" stipulates that the inspection cycle of thermometers shall not exceed one year. The uninterrupted and continuous operation conditions of substations do not support the transformer power outage to carry out thermometer inspection operations. Therefore, the Chinese power industry standard DL 1400-2015 "Regulations" stipulates that the transformer thermometer verification cycle is 6 years based on the 6-year maintenance cycle of the transformer. In practice, it is found that due to reasons such as fatigue of elastic element materials or chronic leakage of closed systems, at least 30% of domestic thermometers are already in a non-conforming state within the 6-year inspection cycle. It can be seen that there is a contradiction between the measurement verification cycle and the substation operation and maintenance cycle. The existing substation uninterrupted and continuous operation conditions do not support the transformer power outage to carry out thermometer inspection operations. The 6-year verification interval is too long for most domestic thermometers, which has caused a large number of pointer thermometers to work with defects, posing a risk to the safe operation of substations.

[0004] Application Contents

[0005] The present application provides a temperature measuring device and a measuring system for a power transformer that can be verified online, and can implement periodic inspection under energized conditions.

[0006] In a first aspect, an embodiment of the present application provides a temperature measuring device for an electric power transformer that can be verified online, comprising a thermometer, a first sensor, a second sensor, and a transmitter. The thermometer is used to detect and display the operating temperature of the electric power transformer. The first sensor is used to detect the operating temperature of the electric power transformer. The second sensor is used to detect the operating temperature of the electric power transformer. The transmitter has a first input terminal and a second input terminal, the first input terminal and the second input terminal are respectively connected to the first sensor and the second sensor, and the transmitter is used to process and transmit the detection data of the first sensor and the second sensor.

[0007] In some of the embodiments, the transmitter includes a storage module, and the storage module is used to store basic data of the first sensor and the second sensor at a plurality of preset temperature points respectively.

[0008] In some of the embodiments, the transmitter further includes a wireless communication module, and the wireless communication module is used for wirelessly transmitting the detection data and the basic data.

[0009] In some embodiments, the temperature measuring device for a power transformer further comprises a base, the base having a first connection end and a second connection end, the first connection end and the second connection end are connected to a first sensor and a second sensor respectively. The transmitter is detachably mounted on the base, and the first input end and the second input end are connected to the first connection end and the second connection end respectively.

[0010] In some embodiments, the thermometer comprises a pressure thermometer, and the first sensor and the second sensor each comprise a thermal resistor sensor.

[0011] In some embodiments, the first sensor includes a thin film thermal resistor sensor, and the second sensor includes a wire-wound thermal resistor sensor.

[0012] In some of these embodiments, the thermometer, the first sensor, and the second sensor are installed in the same area of ​​the power transformer.

[0013] In a second aspect, an embodiment of the present application provides a temperature measurement system for a power transformer, comprising a temperature measurement device for a power transformer in any of the above embodiments and a terminal. The terminal is connected to the temperature measurement device for a power transformer for communication, and the terminal is used to process and display the detection data of the temperature measurement device for a power transformer.

[0014] In some of the embodiments, the terminal has a calibration module, and the calibration module is used to calibrate the detection data according to the basic data.

[0015] In some of the embodiments, the terminal has a screening module, which is used to screen out basic data of a preset temperature point closest to the detection data, so that the calibration module calibrates the detection data according to the basic data screened by the screening module.

[0016] In some of the embodiments, the temperature measurement system for the power transformer further includes a standard resistor, and the number of the standard resistors is multiple, and each standard resistor is used to connect to the transmitter.

[0017] According to an embodiment of the present application, a temperature measuring device for an electric transformer that can be verified online is provided, comprising a thermometer, a first sensor, a second sensor and a transmitter. The thermometer is used to detect and display the operating temperature of the electric transformer. The first sensor is used to detect the operating temperature of the electric transformer. The second sensor is used to detect the operating temperature of the electric transformer. The transmitter has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are respectively connected to the first sensor and the second sensor, and the transmitter is used to process and transmit the detection data of the first sensor and the second sensor. The temperature measuring device of the present application enables the inspector to compare the data of the transmitter with the data of the thermometer, realize periodic inspection under energized conditions, improve the efficiency and quality of periodic inspection, and solve the contradiction between the metrological verification cycle and the operation and maintenance inspection cycle of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the temperature measuring device in the embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the connection between the transmitter and the base in the embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of the temperature measurement system in the embodiment of the present application;

[0022] Figure 4 Schematic diagram of the connection between the transmitter and the standard resistance box in the embodiment of the present application.

[0023] Implementation Method

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the partial embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] See also Figure 1-4 The embodiment of the present application provides a temperature measuring device 10 for a power transformer that can be verified online. The power transformer can be a digital twin power transformer. The temperature measuring device 10 includes a thermometer 11, a first sensor 12, a second sensor 13 and a transmitter 14.

[0026] The thermometer 11 is used to detect and display the operating temperature of the power transformer. The thermometer 11 may include a pressure thermometer 11 , in which case the thermometer 11 may include a meter 110 and a temperature bulb 111 .

[0027] The first sensor 12 is used to detect the operating temperature of the power transformer. The first sensor 12 may include a thermal resistance sensor. In this case, the first sensor 12 may include a thin film thermal resistance sensor, for example, a thin film platinum resistance sensor. There may be multiple first sensors 12, and the connection method of each first sensor 12 is the same.

[0028] The second sensor 13 is used to detect the operating temperature of the power transformer. The second sensor 13 may include a thermal resistor sensor. In this case, the second sensor 13 may include a wire-wound thermal resistor sensor, for example, a wire-wound platinum resistor sensor. The number of the second sensors 13 may be multiple, and the connection method of each second sensor 13 is the same.

[0029] It should be noted that the thermometer 11 , the first sensor 12 and the second sensor 13 may be installed in the same area of ​​the power transformer.

[0030] The transmitter 14 has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are connected to the first sensor 12 and the second sensor 13 respectively. The transmitter 14 is used to process and transmit the detection data of the first sensor 12 and the second sensor 13. Among them, the detection data of the first sensor 12 and the second sensor 13 are both resistance values, which can be converted into 4mA~20mA analog current signals by the transmitter 14 and then transmitted to the remote control room through the line, and the remote control room displays the corresponding temperature value, or can be wirelessly transmitted to the smart terminal 20 through the transmitter 14, and the corresponding temperature value is displayed by the smart terminal 20. The detection data can be directly transmitted to the cloud server 30, or transmitted to the cloud server 30 through the smart terminal 20.

[0031] The transmitter 14 may include a storage module, which is used to store basic data of the first sensor 12 and the second sensor 13 at multiple preset temperature points. The basic data of the first sensor 12 and the second sensor 13 are both resistance values, which can be converted into 4mA-20mA analog current signals by the transmitter 14 and then transmitted to the remote control room via the line, and the remote control room displays the corresponding temperature value, or can be wirelessly transmitted to the smart terminal 20 via the transmitter 14, and the corresponding temperature value is displayed by the smart terminal 20.

[0032] For the basic data of the first sensor 12, an example is given as follows: the resistance value of the thin film thermal resistance sensor under the temperature field conditions of 80° C., 90° C., and 100° C. respectively. For the basic data of the second sensor 13, an example is given as follows: the resistance value of the wire-wound platinum resistance sensor under the temperature field conditions of 80° C., 90° C., and 100° C. respectively. The storage of the above basic data can be completed before the transmitter 14 leaves the factory.

[0033] The transmitter 14 may further include a wireless communication module, which is used to wirelessly transmit the detection data and basic data. The wireless communication method may be Bluetooth, wifi, mobile communication, etc., which is not limited in this application.

[0034] The temperature measuring device 10 for power transformer further comprises a base 15, which has a first connection end and a second connection end, and the first connection end and the second connection end are respectively connected to the first sensor 12 and the second sensor 13. The base 15 can be installed on the power transformer via a T35 standard rail.

[0035] Under the above conditions, the transmitter 14 is detachably mounted on the base 15, and the first input terminal and the second input terminal are connected to the first connection terminal and the second connection terminal respectively. The transmitter 14 can be pluggable and installed on the base 15. In this case, the transmitter 14 can have multiple plugs, and the base 15 can have multiple jacks corresponding to the plugs one by one. The plugs are inserted into the jacks to achieve pluggable installation. The above arrangement allows the transmitter 14 to be removed under power-on conditions, and the transmitter 14 can be calibrated using a standard resistance box 40, and the transmitter 14 can be inserted after calibration.

[0036] In a second aspect, an embodiment of the present application provides a temperature measurement system 1 for a power transformer, comprising a temperature measurement device 10 for a power transformer and a terminal 20 in any of the above embodiments.

[0037] The terminal 20 is connected to the temperature measuring device 10 for the power transformer in communication, and the terminal 20 is used to process and display the detection data of the temperature measuring device 10 for the power transformer. The terminal 20 is specifically a smart terminal, which can be an electronic product such as a mobile phone, a tablet computer, and a computer. The smart terminal 20 can retrieve data in the cloud server 30. The smart terminal 20 can cyclically display the detection data of the first sensor 12 and the second sensor 13.

[0038] The terminal 20 may have a calibration module, which is used to calibrate the detection data according to the basic data. The terminal 20 may have a screening module, which is used to screen out the basic data of the preset temperature point closest to the detection data, so that the calibration module calibrates the detection data according to the basic data screened by the screening module.

[0039] Through the above settings, the calibration method can be as follows: the detection data T1 of the thin film platinum resistance sensor and the detection data T2 of the wire-wound thermal resistor sensor are read through the intelligent terminal 20, and the difference between the two sets of data △=T1-T2 can be obtained. The basic data T1' of the thin film platinum resistance sensor and the basic data T2' of the wire-wound thermal resistor sensor at the preset temperature point closest to the detection data stored in the storage module are retrieved by the intelligent terminal 20, and the difference between the two sets of data △'=T1'-T2' can be obtained. After online comparison, the drift amount δ=△-△' of the platinum resistance sensors obtained by the two manufacturing processes can be obtained. The intelligent terminal 20 automatically calibrates the detection data T1 of the first sensor 12 and the detection data T2 of the second sensor 13 according to the drift amount.

[0040] The above arrangement enables the virtual standard device composed of the first sensor 12, the second sensor 13, the transmitter 14, and the terminal 20 to be automatically calibrated in real time under the operating environment conditions, and can be equivalent to the standard device after calibration.

[0041] The temperature measurement system 1 for power transformer may further include a plurality of standard resistors, each of which is used to connect to the transmitter 14. All standard resistors may be concentrated in a standard resistor box 40.

[0042] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A temperature measurement system for a power transformer, characterized in that: include: Temperature measuring devices for power transformers; and A terminal is connected to the temperature measuring device for the power transformer for communication, and the terminal is used to process and display the detection data of the temperature measuring device for the power transformer; Among them, the temperature measuring device for power transformers includes: Thermometer, used to detect and display the operating temperature of the power transformer; A first sensor, for detecting the operating temperature of the power transformer; a second sensor for detecting an operating temperature of the power transformer; and A transmitter having a first input end and a second input end, wherein the first input end and the second input end are respectively connected to the first sensor and the second sensor, and the transmitter is used to process and transmit detection data of the first sensor and the second sensor; A base having a first connection end and a second connection end, wherein the first connection end and the second connection end are connected to the first sensor and the second sensor respectively; wherein the transmitter is detachably mounted on the base, and the first input end and the second input end are connected to the first connection end and the second connection end respectively; wherein the thermometer, the first sensor and the second sensor are installed in the same area of ​​the power transformer; The transmitter includes a storage module, and the storage module is used to store basic data of the first sensor and the second sensor at a plurality of preset temperature points respectively; The first sensor comprises a thin film thermal resistor sensor, and the second sensor comprises a wire-wound thermal resistor sensor; The terminal has a calibration module, and the calibration module is used to calibrate the detection data according to the basic data; The calibration method is as follows: read the detection data T1 of the thin film thermal resistor sensor and the detection data T2 of the wire-wound thermal resistor sensor through the terminal, and obtain the difference △=T1-T2 between the two sets of data; retrieve the basic data T1' of the thin film thermal resistor sensor and the basic data T2' of the wire-wound thermal resistor sensor at the preset temperature point closest to the detection data stored in the storage module through the terminal, and obtain the difference △'=T1'-T2' between the two sets of data; obtain the drift δ=△-△' of the thermal resistor sensors obtained by the two manufacturing processes after online comparison; the terminal automatically calibrates the detection data T1 of the first sensor and the detection data T2 of the second sensor according to the drift δ.

2. The temperature measurement system for a power transformer according to claim 1, characterized in that: The terminal has a screening module, and the screening module is used to screen out the basic data of the preset temperature point closest to the detection data, so that the calibration module calibrates the detection data according to the basic data screened by the screening module.

3. The temperature measurement system for a power transformer according to claim 1, characterized in that: Also includes: There are multiple standard resistors, each of which is used to connect to the transmitter.

4. The temperature measurement system for a power transformer according to claim 1, characterized in that: The transmitter further comprises a wireless communication module, and the wireless communication module is used for wirelessly transmitting the detection data and the basic data.

5. The temperature measurement system for a power transformer according to claim 1, characterized in that: The thermometer comprises a pressure thermometer.

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