CN113029372A - Non-intrusive on-line monitoring and diagnosing system and method for switch cabinet - Google Patents
Non-intrusive on-line monitoring and diagnosing system and method for switch cabinet Download PDFInfo
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- CN113029372A CN113029372A CN202110138527.0A CN202110138527A CN113029372A CN 113029372 A CN113029372 A CN 113029372A CN 202110138527 A CN202110138527 A CN 202110138527A CN 113029372 A CN113029372 A CN 113029372A
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
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- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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Abstract
The invention discloses a non-intrusive on-line monitoring and diagnosing system and method for a switch cabinet, wherein the system comprises a plurality of non-intrusive temperature sensors and a background system, wherein the non-intrusive temperature sensors and the background system are distributed on the surface of a cabinet body of the switch cabinet; each non-intrusive temperature sensor is provided with a cold end face and a hot end face, is installed on the surface of the switch cabinet body, and the hot end face of the non-intrusive temperature sensor is in direct contact with the surface of the switch cabinet body; each non-intrusive temperature sensor is used for calculating the temperature of a lumped heat source of the switch cabinet according to the temperature of the hot end face, the temperature of the cold end face and a pre-configured non-intrusive algorithm model, and uploading the calculated temperature of the lumped heat source of the switch cabinet to a background system, so that the background system diagnoses the running state of the switch cabinet according to a fault diagnosis threshold value preset by the system. The invention can solve the problems of large quantity of sensors, complex installation engineering and the like in the prior art.
Description
Technical Field
The invention relates to temperature monitoring of a switch cabinet, in particular to a non-intrusive on-line monitoring and diagnosing system and method for the switch cabinet.
Background
In the traditional switch cabinet monitoring, a contact sensor or an infrared probe sensor is generally arranged at a corresponding part in the cabinet body of the switch cabinet to realize temperature monitoring in the switch cabinet. However, the switch cabinet is totally enclosed during operation, and high current and high voltage exist in the switch cabinet; when the sensor needs to be installed or maintained, the power supply of the switch cabinet needs to be disconnected and the switch cabinet needs to be opened, so that the installation and the replacement of the sensor can be realized. Therefore, compared with the traditional contact monitoring mode, the non-intrusive monitoring mode for the switch cabinet is relatively more convenient for installation and maintenance of the sensor. However, in the conventional non-intrusive monitoring of the switch cabinet, the temperature of the surface of the cabinet body of the switch cabinet is monitored by installing sensors at a plurality of key parts of the surface of the cabinet body of the switch cabinet, and meanwhile, the ambient temperature is monitored by arranging corresponding ambient temperature sensors, and the temperature of a lumped heat source in the switch cabinet is calculated by acquiring monitoring data of the plurality of ambient temperature sensors and combining a non-intrusive algorithm. In the method, a plurality of independent sensors are needed to respectively carry out corresponding monitoring, and once a certain environment temperature sensor is disconnected with a monitoring system, the calculation of the temperature of the lumped heat source of the switch cabinet cannot be realized; meanwhile, in many practical projects, due to the fact that the number of the environment temperature sensors is large, confusion and omission easily occur in installation, and the problems that monitoring results are wrong and the like are caused.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide a non-intrusive on-line monitoring and diagnosing system for a switch cabinet, which can solve the problems of the prior art, such as a large number of sensors and complicated installation engineering in the temperature monitoring of the switch cabinet.
The second objective of the present invention is to provide a non-intrusive online monitoring and diagnosing method for a switch cabinet, which can solve the problems of the prior art, such as a large number of sensors and complicated installation engineering in the temperature monitoring of the switch cabinet.
One of the purposes of the invention is realized by adopting the following technical scheme:
a non-intrusive on-line monitoring and diagnosing system for a switch cabinet comprises a plurality of non-intrusive temperature sensors and a background system, wherein the non-intrusive temperature sensors and the background system are distributed on the surface of a cabinet body of the switch cabinet; each non-intrusive temperature sensor is provided with a cold end face and a hot end face; each non-intrusive temperature sensor is arranged on the surface of the cabinet body of the switch cabinet, and the hot end surface of the non-intrusive temperature sensor is in direct contact with the surface of the cabinet body of the switch cabinet; each non-intrusive temperature sensor is in communication connection with the background system and used for calculating the temperature of a lumped heat source of the switch cabinet according to the temperature of the hot end face, the temperature of the cold end face and a pre-configured non-intrusive algorithm model and uploading the calculated temperature of the lumped heat source of the switch cabinet to the background system, so that the background system diagnoses the running state of the switch cabinet according to a fault diagnosis threshold preset by the system.
Further, each non-intrusive temperature sensor comprises a centralized control module; the centralized control module is in communication connection with the background system and is used for calculating the temperature of a lumped heat source of the switch cabinet according to the temperature of the hot end face and the temperature of the cold end face of each non-intrusive temperature sensor and the non-intrusive algorithm model;
wherein the lumped heat source temperature theta of the switch cabinet1(t) is:
wherein, theta2(t) is the temperature of the hot end face; theta3(t) is the temperature of the cold end face; a. the12The heat transfer thermal resistance coefficient between the lumped heat source and the hot end surface of the switch cabinet is constant; a. the23Is the heat transfer thermal resistance coefficient between the hot end surface and the cold end surface and is a constant; b is12The thermal capacitance coefficient is the sum of all substances in the hot end surface and the isothermal surface of the switch cabinet and is a constant; t is the sensor sampling time, then
Is the derivative of temperature with respect to time.
Furthermore, the non-intrusive temperature sensor also comprises a wireless communication module and a data storage module; the centralized control module is in communication connection with the background system through the wireless communication module; the data storage module is electrically connected with the centralized control module and is used for storing the configured non-intervention algorithm model, the temperature of the hot end face, the temperature of the cold end face, the calculated result data and the corresponding sampling time.
Further, the non-intrusive temperature sensor is a dual-probe temperature sensor; the double-probe temperature sensor is provided with a first hot end surface and a first cold end surface, and the first hot end surface and the first cold end surface are oppositely arranged at the upper end and the lower end of the double-probe temperature sensor; the first hot end face is a hot end face of the non-intrusive temperature sensor, and the first cold end face is a cold end face of the non-intrusive temperature sensor;
the double-probe temperature sensor is arranged on the surface of the switch cabinet body, and the first hot end surface is in direct contact with the surface of the switch cabinet body; the double-probe temperature sensor comprises a first hot end temperature probe, a cold end temperature probe and a power supply module;
the first hot end temperature probe is arranged between the first hot end surface and the surface of the switch cabinet body and is used for detecting the temperature of the first hot end surface; the cold end temperature probe is arranged on the first cold end surface and used for detecting the temperature of the first cold end surface; the first hot end temperature probe and the cold end temperature probe are respectively electrically connected with the centralized control module; the power supply module is electrically connected with the centralized control module and is used for providing power supply for the centralized control module; the centralized control module is used for simultaneously obtaining the temperature of the first hot end face through the first hot end temperature probe and the temperature of the first cold end face through the cold end face probe according to a preset time interval, recording sampling time, calculating the temperature of the lumped heat source of the switch cabinet according to the temperature of the first hot end face, the temperature of the first cold end face, the sampling time and a non-intrusive algorithm model configured by the double-probe temperature sensor, and transmitting the temperature of the lumped heat source to the background system.
Further, the non-intrusive temperature sensor is a temperature difference sensor; the temperature difference sensor comprises a thermoelectric generator, a voltage sampling circuit and a second hot end temperature probe; the thermoelectric generator is provided with a second hot end face and a second cold end face, and the second hot end face and the second cold end face are oppositely stacked; the second hot end face is a hot end face of the non-intrusive temperature sensor, and the second cold end face is a cold end face of the non-intrusive temperature sensor;
when the temperature difference sensor is arranged on the surface of the cabinet body of the switch cabinet, the second hot end surface is in direct contact with the surface of the cabinet body of the switch cabinet; the thermoelectric generator can generate output voltage by generating temperature difference between the second hot end surface and the second cold end surface; the centralized control module is electrically connected with the thermoelectric generator through a voltage sampling circuit and is used for acquiring the output voltage of the thermoelectric generator through the voltage sampling circuit;
the second hot end temperature probe is arranged between the second hot end surface and the surface of the switch cabinet body and is used for detecting the temperature of the second hot end surface; the centralized control module is electrically connected with the second hot end temperature probe and is used for acquiring the temperature of the second hot end face through the second hot end temperature probe; the centralized control module is used for simultaneously sampling the second hot end temperature probe according to a preset time interval to obtain the temperature of the second hot end face and the output voltage of the thermoelectric generator through the voltage sampling circuit, recording the sampling time, then obtaining the temperature difference between the second hot end face and the second cold end face and the temperature of the second cold end face according to the temperature of the second hot end face, the output voltage of the thermoelectric generator and the sampling time, and calculating the lumped heat source temperature of the switch cabinet according to the temperature of the second hot end face, the temperature of the second cold end face and a non-intrusive algorithm model configured by the temperature difference sensor and transmitting the lumped heat source temperature to the background system.
Further, the temperature difference sensor also comprises a rechargeable battery and a power supply management module; one end of the power management module is electrically connected with the rechargeable battery, and the other end of the power management module is electrically connected with the thermoelectric generator, and is used for acquiring electric energy generated by the thermoelectric generator and storing and/or charging the rechargeable battery; the power management module is electrically connected with the centralized control module and used for supplying power to the centralized control module; when the electric energy generated by the thermoelectric generator does not meet the electric energy required by the operation of the temperature difference sensor, the rechargeable battery supplies power to the centralized control module; when the electric energy generated by the thermoelectric generator supplies power for the centralized control module, the rechargeable battery does not supply power.
Further, the background system comprises an online monitoring diagnosis unit, a model management unit and a configuration unit; the online monitoring and diagnosing unit is used for receiving monitoring data sent by each non-intrusive temperature sensor and the calculated lumped heat source temperature of the switch cabinet, diagnosing the operation state of the switch cabinet according to a fault diagnosis threshold preset by the system and/or judging whether to give an alarm according to a diagnosis result; the model management unit is used for optimizing the model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor according to the initial monitoring data, the original equipment ledger information and the switch cabinet load historical data of each non-intrusive temperature sensor and in combination with the non-intrusive algorithm model to obtain corresponding optimized parameters; the configuration unit is used for managing the optimized model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor and sending the corresponding optimized model parameters to the corresponding non-intrusive temperature sensor, so that the model parameters of the non-intrusive algorithm model of the non-intrusive temperature sensor are updated.
Further, when the switch cabinet is changed, the background system optimizes the model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor.
The second purpose of the invention is realized by adopting the following technical scheme:
the invention relates to a non-intrusive on-line monitoring and diagnosing method for a switch cabinet, which is applied to a non-intrusive on-line monitoring and diagnosing system for the switch cabinet and is adopted as one of the purposes of the invention, wherein the monitoring and diagnosing method comprises the following steps:
the installation step: distributing a plurality of non-intrusive temperature sensors at the position of a temperature rise key point on the surface of a cabinet body of the switch cabinet, and simultaneously connecting each non-intrusive temperature sensor with a background system in a communication manner;
a calculation step: calculating the temperature of a lumped heat source of the switch cabinet by each non-intrusive temperature sensor according to the temperature of the hot end face and the temperature of the cold end face of the non-intrusive temperature sensor and a non-intrusive algorithm model which is configured in advance;
a diagnosis step: and uploading the calculated lumped heat source temperature of the switch cabinet to a background system, so that the background system diagnoses the operation state of the switch cabinet according to the lumped heat source temperature of the switch cabinet and a fault diagnosis threshold preset in the system.
Further, in the diagnosis step, the background system also judges whether to give an alarm according to the diagnosis result, and obtains a schematic diagram of temperature distribution in the switch cabinet according to the distribution position of each non-intrusive temperature sensor and the temperature of the lumped heat source of the switch cabinet.
Compared with the prior art, the invention has the beneficial effects that:
the non-intrusive temperature sensor is arranged on the surface of the cabinet body of the switch cabinet, and the non-intrusive temperature sensor is provided with a hot end face and a cold end face, so that the hot end face is directly contacted with the surface of the cabinet body of the switch cabinet; the temperature of the hot end face and the temperature of the cold end face of the non-intrusive temperature sensor are obtained, the temperature of the lumped heat source of the switch cabinet is calculated by combining a non-intrusive algorithm model configured in the non-intrusive temperature sensor, and the temperature is uploaded to a background system, so that the background system diagnoses the running state of the switch cabinet according to the temperature of the lumped heat source of the switch cabinet, and the on-line monitoring diagnosis of the switch cabinet is realized.
Drawings
FIG. 1 is a schematic diagram of a background system and a non-intrusive temperature sensor according to the present invention;
FIG. 2 is a schematic diagram of the dual probe temperature sensor of FIG. 1;
FIG. 3 is a schematic diagram of the dual probe temperature sensor and the background system shown in FIG. 1;
FIG. 4 is a schematic diagram of a heat transfer structure between the dual probe temperature sensor and the switch cabinet of FIG. 1;
FIG. 5 is a diagram of a measured temperature trend of a dual-probe temperature sensor in a cable chamber of a ring main unit;
FIG. 6 is a schematic view showing the construction of the temperature difference sensor of FIG. 1;
FIG. 7 is a schematic diagram of the temperature difference sensor and the background system in FIG. 1;
FIG. 8 is a schematic diagram of a heat transfer structure between a thermoelectric generator and a switch cabinet of the temperature difference sensor in FIG. 1;
FIG. 9 is a graph comparing the measured temperature difference at the cold and hot ends of the thermoelectric generator of FIG. 6 with the output voltage;
fig. 10 is a comparison graph of the calculated lumped heat source temperature and the measured temperature of the cable chamber of the ring main unit;
FIG. 11 is a comparison graph of the estimated lumped heat source temperature and the measured temperature of the cable chamber after model parameter optimization;
fig. 12 is a flowchart of a non-intrusive online monitoring and diagnosing method for a switch cabinet according to the present invention.
In the figure: 1. a switch cabinet; 2. a dual probe temperature sensor; 3. a thermoelectric generator; 41. a first hot end face; 42. a second hot end face; 51. a first cold end face; 52. a second cold end face; 6. a cold end temperature probe; 71. a first hot end temperature probe; 72. a second hot end temperature probe; 8. a cold end surface heat sink; 9. a lumped heat source.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
According to the method, a temperature field distribution data model of the primary conductor in the switch cabinet in the temperature rise and heat dissipation process is established based on the heat transfer principle, and the mathematical model is verified based on experimental tests, so that optimized model parameters are obtained. The model determines the relationship between the temperatures of two different points of the installation position of the non-intrusive temperature sensor on the outer wall of the cabinet body of the switch cabinet and the temperature of the lumped heat source of the switch cabinet. Preferably, the lumped heat source temperature of the switchgear corresponds to the total thermal power of the switchgear, and the affected factors include: load current thermal power of a primary conductor, contact resistance thermal power, eddy current heating power of a ferromagnetic structural part, high-voltage medium loss thermal power, thermal power of a heater in a cabinet, starting of a cooling fan, cooling structure and material of a cabinet body, thermal balance time parameters and the like. For example, the fault heat generation is mainly caused by deterioration of the contact resistance. When the contact resistance is subjected to large fault sudden change, the temperature of the lumped heat source exceeds a normal controllable range. Therefore, the invention mainly comprises two parts, one part is used for detecting the temperature of the lumped heat source of the switch cabinet, the other part is used for carrying out fault diagnosis on the operation state of the switch cabinet according to the detected temperature of the lumped heat source of the switch cabinet, and when a fault occurs, related workers can be reminded to take corresponding measures in time.
As shown in fig. 1, the present invention provides a preferred embodiment, a non-intrusive on-line monitoring and diagnosing system for a switch cabinet, which includes a non-intrusive temperature sensor and a background system.
Wherein, non-intrusive temperature sensor has a plurality ofly, divides to locate on the cabinet body surface of cubical switchboard. More preferably, the plurality of non-intrusive temperature sensors are respectively arranged at corresponding key point positions on the surface of the cabinet body of the switch cabinet. For example, for a certain combination switch type gas insulated 630A ring main unit, the non-intrusive temperature sensor can be installed at the position of the critical point of temperature rise on the outer side of the cabinet wall of the cable chamber of the ring main unit or the outer wall of the gas box of the ring main unit. Therefore, each non-intrusive temperature sensor detects the temperature of the lumped heat source of the switch cabinet and transmits the temperature to the background system so as to detect the temperature of the lumped heat source of the switch cabinet, perform fault diagnosis and the like.
Preferably, each non-intrusive temperature sensor is provided with a cold end face and a hot end face. The hot end face is in contact with the surface of the switch cabinet body, and the cold end face is arranged on one side far away from the surface of the switch cabinet body and opposite to the hot end face. The temperature of the hot end face and the temperature of the cold end face are obtained, and the temperature of the lumped heat source of the switch cabinet is calculated by combining a non-intrusive algorithm model configured by a non-intrusive temperature sensor.
Preferably, the non-intrusive temperature sensor comprises a centralized control module, a data storage module and a wireless communication module. The centralized control module of each non-intrusive temperature sensor is in communication connection with the background system through the wireless communication module and is used for acquiring the temperature of the hot end face and/or the temperature of the cold end face, calculating the temperature of the lumped heat source of the switch cabinet by combining with a non-intrusive algorithm model of the centralized control module, and sending the temperature of the lumped heat source of the switch cabinet calculated to the background system, so that the background system can carry out fault diagnosis on the equipment running state of the switch cabinet according to the temperature of the lumped heat source sent by each non-intrusive temperature sensor and a preset threshold range.
Furthermore, when the centralized control module is in communication connection with the background system through the wireless communication module, the centralized control module is further configured to receive an instruction sent by the background system, and upload data such as measurement data, sampling time, calculation results and the like according to a required time period or frequency in the instruction.
Preferably, the data storage module is electrically connected to the centralized control module and is configured to store data such as configured non-intrusive algorithm model, measurement data, and estimation result, for example, store the non-intrusive algorithm model, the temperature of the hot end face, the temperature of the cold end face, the estimated lumped heat source temperature of the switchgear, and the estimated sampling time each time.
Preferably, the background system also judges whether to send out an alarm notification according to the diagnosis result of the operating state of the switch cabinet, and can remind relevant workers in time when a fault occurs, so that errors can be found in time, and the maintenance is facilitated. Preferably, the background system also displays a temperature distribution cloud picture of a primary conductor in the switch cabinet and the distribution position of each temperature sensor on the surface of the switch cabinet in a simulation mode according to the 3D model of the preset cabinet body of the switch cabinet, and displays the temperature distribution cloud picture and the distribution position of each temperature sensor on the surface of the switch cabinet to a tester in a visual mode.
Preferably, the model parameters differ for the non-intrusive algorithmic model due to differences in the cabinet type of the switchgear. In order to improve the accuracy of the calculation result of the non-intrusive temperature sensors, the model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor are optimized through the background system according to the cabinet type of the switch cabinet, and then the optimized model parameters are sent to the corresponding non-intrusive temperature sensors for configuration. Therefore, the non-intrusive temperature sensor can calculate the temperature of the lumped heat source of the switch cabinet according to the non-intrusive algorithm model after configuration optimization.
Preferably, the background system comprises an online monitoring diagnosis unit, a model management unit and a configuration unit. Each non-intrusive temperature sensor calculates the temperature of a lumped heat source of the switch cabinet according to the detection data of the non-intrusive temperature sensor and the non-intrusive algorithm model configured by the non-intrusive temperature sensor and uploads the temperature to the background system. Therefore, the online monitoring and diagnosing unit of the background system is used for carrying out fault diagnosis on the operation state of the switch cabinet by using the monitoring data of each non-intrusive temperature sensor, the calculated lumped heat source temperature result data of the switch cabinet and the set diagnosis threshold value in the system, and providing corresponding alarm functions of different levels according to the diagnosis result.
Preferably, due to the characteristics of different equipment types and the like of each switch cabinet, in order to ensure the accuracy of the measurement result, the model parameters of the non-intrusive algorithm model configured by each non-intrusive temperature sensor are optimized. The model management unit is used for receiving the original data of each non-intrusive temperature sensor, the original equipment ledger information and the load historical data of the switch cabinet, verifying and optimizing the model parameters of the non-intrusive algorithm model configured for each non-intrusive temperature sensor, and obtaining the optimized model parameters.
Preferably, when the cabinet type of the switch cabinet changes, after the non-intrusive temperature sensor installed on the switch cabinet is in communication connection with the background system, the non-intrusive temperature sensor transmits the detected original monitoring data and the sampling time to the background system. Meanwhile, the model management unit of the background system automatically acquires cabinet model parameters according to a preset cabinet equipment model of the switch cabinet, acquires original data of the temperature sensors, original equipment ledger information, equipment load data in the background system, acquired original monitoring data of the temperature sensors and sampling time, verifies and optimizes the model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor, and simultaneously sends the optimized model parameters to the configuration unit.
A configuration unit for managing model parameters of each non-intrusive temperature sensor. The configuration unit is used for storing the model parameters of each non-intrusive temperature sensor; and the non-intrusive temperature sensor is also used for generating a configuration instruction and sending the configuration instruction to the corresponding non-intrusive temperature sensor, so that the non-intrusive temperature sensor performs configuration updating on the model parameters of the non-intrusive algorithm model stored in the non-intrusive temperature sensor according to the configuration instruction. Wherein the configuration instructions include model parameters. Preferably, when the switch cabinet is changed, the background system optimizes the key model parameters, and then sends the optimized model parameters to the corresponding temperature sensors to reconfigure the model parameters. Wherein, the change can comprise the conditions of maintenance, modification, replacement, long-term shutdown and then electrified operation, etc.
Preferably, when the centralized control module calculates the lumped heat source temperature of the switch cabinet according to the cold end surface temperature, the hot end surface temperature and the non-intrusive algorithm model, the method specifically adopts the formula (1):
wherein, theta1(t) is the lumped heat source temperature of the switch cabinet; theta2(t) is the temperature of the hot end face; theta3(t) is the temperature of the cold end face; a. the12The thermal conductivity coefficient of thermal resistance between the lumped heat source and the hot end surface of the switch cabinet is constant; a. the23Is the heat transfer thermal resistance coefficient between the hot end surface and the cold end surface and is a constant; b is12The thermal capacitance coefficient is the sum of all substances in the hot end surface and the isothermal surface of the switch cabinet and is a constant; t is the sensor sampling time, then
Is the derivative of temperature with respect to time.
Wherein A is12、A23、B12Model parameters that are all non-intrusive algorithmic modelsThe numerical value is corresponding to the specification and the model of the switch cabinet, and can be obtained by solving an equation set to obtain a model parameter numerical value solution through a plurality of groups of experimental data through a previous experiment, solving the model parameter numerical value solution obtained through a plurality of experiments, and solving a statistical average value or performing function fitting optimization.
Preferably, A23The thermal conductivity coefficient of thermal resistance between the hot end face and the cold end face is the internal solidification characteristic physical quantity of the sensor, is extremely difficult to change and is generally a fixed constant.
B12For a switch cabinet with determined specification, B is the thermal capacity coefficient of the total of all substances in the hot end face isothermal surface of the switch cabinet12Changes are rare and are generally fixed constants.
A12The thermal conductivity coefficient of thermal resistance between the lumped heat source and the hot end face of the switch cabinet is easy to change when the switch cabinet is changed. Therefore, when the switch cabinet is changed, the parameter is a model parameter that needs to be optimized. Thus, for equation (1), i.e., for the entire non-intrusive algorithmic model, the model parameters A12The method is a key parameter of the formula (1), and when the model parameter of the non-intervention algorithm model is optimized, only the parameter needs to be optimized.
Preferably, the static working environment refers to a state where the physical quantity does not change with time, is static and is relatively ideal. Therefore, when the switch cabinet operates in a static operating environment, equation (1) can be converted into equation (2), specifically:
the static lumped heat source temperature is:
setting up
Then equation (2) is converted to equation (3):
θ1(t)＝θ2(t)+kΔθ23(t) (3)。
wherein k refers to model parameters of the simplified non-intrusive algorithm model.
Therefore, when the switch cabinet is changed, the model parameter k can be optimized through a background system. Specifically, according to the design principle of the power equipment, the maximum ampacity of the power equipment is limited by the actual maximum temperature of the power equipment, that is, the maximum ampacity of the power equipment has a corresponding relationship with the actual maximum temperature. Therefore, according to the mathematical model of the current heating and heat dissipation process, a model equation of the system in a static state can be obtained, which is specifically expressed as follows:
Δθ(t)＝kiI(t)2,Δθ(t)＝θ1(t)-θ0(t)
Δθe＝kiIe 2,Δθe＝θe-θ0(t)。
wherein, theta0(t) is the ambient temperature of the switchgear; theta1(t) is the lumped heat source temperature of the switch cabinet; thetaeThe method comprises the steps of providing a conductor temperature rated value in a switch cabinet and original design information of the switch cabinet; i iseThe current rating of the switch cabinet is the original design information of the switch cabinet; k is a radical ofiThe temperature rise coefficient of a theoretical lumped heat source for current heating; i (t) is the current value of a static condition. From the above equation, θe、IeThe original design information for the equipment in the switchgear is known; i (t), θ0(t) may be obtained from other backend systems or devices; k is a radical ofiThe temperature rise coefficient of the theoretical lumped heat source for current heating is a constant coefficient and can be obtained; therefore, the lumped heat source temperature theta of current heating can be calculated according to the equation1(t)。
When the working state of the switch cabinet is in a static condition, the temperature theta of the lumped heat source for heating the circuit is obtained1After (t), calculating a model parameter k according to the non-intrusive algorithm model and the temperature difference between the hot end face and the cold end face of the non-intrusive temperature sensor, specifically:
wherein, theta2(t)、θ3And (t) the temperature of the hot end face and the temperature of the cold end face of the non-intrusive temperature sensor are respectively obtained through the non-intrusive temperature sensor, so that the model parameter k can be obtained through calculation of the temperature of the hot end face and the temperature of the cold end face.
Due to the fact that
From the foregoing, when the order A23When the constant is not changed, the optimized A is obtained according to k12Therefore, the optimization of each parameter in the formula (1) is realized, and the optimized parameter is sent to each non-intrusive temperature sensor through a background system to update the model parameter of the non-intrusive algorithm model configured by the non-intrusive temperature sensor.
When the model parameters are optimized, the non-intrusive temperature sensor uploads the detected original temperature data to the background system, so that the background system optimizes the model parameters, sends the optimized model parameters to the non-intrusive temperature sensor, and configures and updates a non-intrusive algorithm model in the non-intrusive temperature sensor. Preferably, as shown in fig. 10, a comparison graph of the lumped heat source temperature estimated by the looped network cabinet cable chamber and the measured temperature is obtained. Fig. 11 is a comparison graph of the lumped heat source temperature and the measured temperature calculated by the looped network cabinet cable chamber after the model parameters are optimized. From the comparison, the reasonability of the model parameter optimization provided by the invention is verified that the lumped heat source temperature calculated after the model parameter optimization is closer to the actually measured temperature value.
The non-intrusive temperature sensor is also used for uploading the collected temperature data, the calculated lumped heat source data of the switch cabinet, the state information data of the sensor, the power supply use data, the configuration information data of the sensor, the sensor version and other information to the background system.
The non-intrusive temperature sensor is arranged on the surface of the cabinet body of the switch cabinet, so that the temperature of the lumped heat source in the cabinet can be monitored, meanwhile, the fault diagnosis can be carried out on the switch cabinet, an additional environment temperature sensor is not needed, the sensor is not needed to be installed in a power failure mode for primary power equipment, the construction process of monitoring engineering is greatly simplified, and the online monitoring and fault diagnosis of the temperature of the lumped heat source of the switch cabinet are optimized.
More preferably, the non-intrusive temperature sensor in the present embodiment is a dual-probe temperature sensor or a temperature difference sensor. Preferably, each non-intrusive temperature sensor can adopt a dual-probe temperature sensor and a temperature difference sensor.
When the non-intrusive temperature sensor is a dual-probe temperature sensor, as shown in fig. 2-3, the dual-probe temperature sensor includes a first hot-side temperature probe and a cold-side temperature probe. The double-probe temperature sensor is provided with a first hot end face and a first cold end face, and the first hot end face and the first cold end face are oppositely arranged at two ends of the double-probe temperature sensor. The first hot end face is the hot end face of the non-intrusive temperature sensor, and the first cold end face is the cold end face of the non-intrusive temperature sensor.
The first hot end temperature probe is arranged on a first hot end face of the double-probe temperature sensor and used for detecting the temperature of the first hot end face of the double-probe temperature sensor. The cold junction temperature probe is arranged on a first cold junction surface of the double-probe temperature sensor and used for monitoring the temperature of the first cold junction surface of the double-probe temperature sensor.
Specifically, as shown in fig. 4, a schematic diagram of a heat transfer structure between the dual-probe temperature sensor 2 and the switch cabinet 1 in this embodiment is shown. A lumped heat source 9 is present in the switchgear cabinet 1. The dual probe temperature sensor 2 is provided with a first hot end face 41 and a first cold end face 51. The dual-probe temperature sensor 2 is installed on the surface of the switch cabinet 1, the first hot end face 41 is in direct contact with the surface of the switch cabinet 1, and the first cold end face 51 is arranged on one side of the switch cabinet 1 far away from the cabinet body. The first hot end face 41 and the first cold end face 51 of the dual probe temperature sensor 2 are provided opposite to the upper and lower ends of the dual probe temperature sensor 2. And a first hot-end temperature probe 71 for detecting the temperature of the first hot end face 41 of the dual-probe temperature sensor 2. And the cold end temperature probe 6 is used for detecting the temperature of the first cold end surface 51 of the double-probe temperature sensor 2. When the switch cabinet 1 is in operation, the cabinet body temperature of the switch cabinet 1 rises due to heat generated by the switch cabinet 1. The temperature of the first hot end face 41 can be increased by contacting the first hot end face 41 with the cabinet body surface of the switch cabinet 1, and the first cold end face 51 is arranged on the side away from the cabinet body surface of the switch cabinet 1 and opposite to the first hot end face 41.
Preferably, the first hot end temperature probe and the cold end temperature probe are respectively electrically connected with the centralized control module. The centralized control module is configured to obtain the temperature of the first hot end face and the temperature of the first cold end face through the first hot end temperature probe and the cold end temperature probe, and calculate the lumped heat source temperature of the switchgear by combining a non-intrusive algorithm model pre-configured in the dual-probe temperature sensor, as shown in fig. 5, the temperature is an actually measured temperature trend diagram of the dual-probe temperature sensor of the cable chamber of the ring main unit.
In order to avoid calculation errors caused by sampling time difference, when the centralized control module acquires data of a first hot end temperature probe and a cold end temperature probe of the double-probe temperature sensor, the data needs to be synchronously acquired, and sampling time is recorded at the same time. Specifically, the centralized control module may simultaneously send sampling instructions to the first hot-end temperature probe and the cold-end temperature probe according to a preset time interval to obtain sampling data.
More preferably, the two temperature probes of the dual-probe temperature sensor in this embodiment are fixed and the same in structure and material, and are fixed and unchanged, and have the same heat conductivity, and when data is sampled, the sampling time of the two temperature probes is kept synchronous.
The dual probe temperature sensor also includes a power module. The power module is used for providing power for the centralized control module.
Preferably, the first hot end face and the first cold end face are structurally fixed, and a heat conduction material is arranged between the first hot end face and the first cold end face. The heat conduction material has stable heat conduction coefficient, is not influenced by external environment change, has the performances of interference resistance, ageing resistance and the like, and keeps the performances unchanged after long-time use. Preferably, the heat conduction material is a nylon + glass fiber composite material.
More preferably, in this embodiment, the first hot-end temperature probe and the cold-end temperature probe use high-precision temperature measurement components of the same type, so as to ensure the calculation precision of the temperature difference between the two ends.
Wherein, the temperature measurement precision error of the first hot end temperature probe and the cold end temperature probe is not more than +/-1 ℃. The centralized control module collects the temperature of the first hot end face through the first hot end temperature probe, the sampling time and the sampling period of the temperature collection of the first cold end face through the cold end temperature probe are the same, and the difference of a dynamic process is avoided. Preferably, the sampling period is 30 seconds/time. Meanwhile, the deviation of the sampling time points of the cold end temperature probe and the first hot end temperature probe is not more than +/-5 seconds.
By adopting the double-probe temperature sensor provided by the invention, two temperature probes are integrated, and the temperatures of the first cold end surface and the first hot end surface are respectively obtained, so that the detection of the ambient temperature is realized without an additional ambient temperature sensor, the number of sensors used in the engineering is reduced, and the engineering cost is saved. Meanwhile, the double-probe temperature sensor is arranged on the surface of the switch cabinet body, the sensor is not required to be installed in a power failure mode, the problems that in the prior art, when the sensor needs to be replaced, the power failure is required, the switch cabinet is opened to achieve the temperature of the sensor, the economic loss is caused and the like are solved, the construction process is greatly simplified, and the on-line monitoring of the switch cabinet is optimized.
When the non-intrusive temperature sensor is a differential temperature sensor, as shown in fig. 6-7, the differential temperature sensor includes a thermoelectric generator. The thermoelectric generator is provided with a second hot end face and a second cold end face, wherein the second hot end face is a hot end face of the non-intrusive temperature sensor, and the second cold end face is a cold end face of the non-intrusive temperature sensor.
The second hot end face and the second cold end face of the thermoelectric generator are oppositely stacked. The temperature difference sensor is installed on the surface of the switch cabinet body, the second hot end face of the thermoelectric generator is in direct contact with the surface of the switch cabinet body, and the second cold end face is arranged on one side of the surface of the switch cabinet body far away from the switch cabinet.
When the switch cabinet is in the operation process, the temperature of the cabinet body of the switch cabinet is increased due to the fact that the switch cabinet can generate heat. Through with the cabinet body surface contact of the hot terminal surface of second and cubical switchboard, can make the temperature rise of the hot terminal surface of second for the hot terminal surface of second produces the difference in temperature with the second cold junction face, and semiconductor element in the thermoelectric generator produces corresponding output voltage. More preferably, the temperature difference sensor further comprises a voltage sampling circuit and a second hot-side temperature probe.
Preferably, one end of the voltage sampling circuit is electrically connected to the thermoelectric generator, and the other end of the voltage sampling circuit is electrically connected to the centralized control module, and is configured to obtain the output voltage of the thermoelectric generator and send the output voltage to the centralized control module.
And the second hot end temperature probe is arranged on the second hot end surface and used for detecting the temperature of the second hot end surface. Specifically, the second hot end temperature probe is arranged between the second hot end surface and the surface of the switch cabinet body.
Specifically, fig. 8 is a schematic diagram of a heat transfer structure between the thermoelectric generator 3 and the switch cabinet 1. Wherein a lumped heat source 9 is arranged in the switch cabinet 1. A second hot side temperature probe 72 is mounted to the second hot side 42 for sensing the temperature of the second hot side 42. Preferably, the centralized control module is electrically connected to the second hot end temperature probe 72, and is configured to obtain the temperature of the second hot end face 42 through the second hot end temperature probe 72. Further, a second hot end temperature probe 72 is arranged between the second hot end face 42 and the cabinet body surface of the switch cabinet 1. More preferably, the second cold end face 52 is provided with cold end face fins 8. The heat of the second cold end surface 52 is dissipated through the cold end surface cooling fins 8, so that the temperature difference between the second cold end surface 52 and the second hot end surface 42 can be ensured, and the power generation of the thermoelectric generator 3 is facilitated.
The thermoelectric generator in the embodiment adopts the standardized electric elements on the market, is manufactured by utilizing the thermoelectric seebeck effect principle, and when a temperature difference exists between two ends of the thermoelectric generator, the semiconductor output end of the thermoelectric generator can generate corresponding output voltage. As shown in fig. 9, which is a comparison graph of the measured temperature difference between the cold end and the hot end of the thermoelectric generator and the output voltage, it can be seen from the graph that the output voltage of the thermoelectric generator and the temperature difference between the cold end and the hot end of the thermoelectric generator are in a linear relationship, which can be specifically expressed by formula (1):
Us＝maΔθ23(t),Δθ23(t)＝θ2(t)-θ3(t) (9)。
wherein, UsIs the output voltage of the thermoelectric generator; theta2(t) is the temperature of the second hot end face; theta3(t) a temperature of the second cold end face; delta theta23(t) is the temperature difference of the second cold and hot end face; m is the number of semiconductors in the thermoelectric generator, and is known; a is the seebeck coefficient of the semiconductor in the thermoelectric generator, determined by the characteristics of the semiconductor in the thermoelectric generator, and is known.
It can be calculated according to equation (1):
temperature difference delta theta of cold and hot end faces of thermoelectric generator23(t) is:
temperature theta of the second cold end face of the thermoelectric generator3(t) is: theta3(t)＝θ2(t)-Δθ23(t) (11)。
Therefore, the invention utilizes the physical characteristics of the thermoelectric generator, only needs to detect the temperature of the second hot end surface, and then can calculate the temperature difference of the cold and hot end surfaces of the thermoelectric generator and the temperature of the second cold end surface by combining the output voltage of the thermoelectric generator, thereby avoiding the problem of asynchronism when two temperature measurement components are adopted to respectively detect the temperature of the second cold end surface and the temperature of the second hot end surface, simultaneously reducing the number of temperature measurement probes, saving the cost and reducing the size of the sensor.
Preferably, the temperature difference sensor comprises a rechargeable battery and a power management module, and the power management module is electrically connected with the centralized control module. Wherein, rechargeable battery provides the power for centralized control module. And the power supply management module is used for managing the power supply of the temperature difference sensor, for example, storing and managing the electric energy generated by the thermoelectric generator, and simultaneously charging the rechargeable battery. The temperature difference sensor of the embodiment is a dual-power sensor mainly taking electric energy. A thermoelectric generator is arranged in the temperature difference sensor and serves as a first power supply, and a rechargeable battery is also arranged in the temperature difference sensor and serves as a second power supply, so that the stable operation of the temperature difference sensor can be guaranteed. Specifically, when the temperature difference exists between the second cold end face and the second hot end face of the thermoelectric generator of the temperature difference sensor, the two ends of the thermoelectric generator generate corresponding potential difference (voltage), and then the voltage is transmitted to the power management circuit to be collected, converted and stored, and meanwhile, the thermoelectric generator can also be charged by the rechargeable battery, so that the thermoelectric generator of the temperature difference sensor can not generate electricity and provide electricity for the thermoelectric generator through the rechargeable battery. That is, in the case that the electric energy generated by the thermoelectric generator can satisfy the electric energy required for the operation of the temperature difference sensor, the temperature difference sensor is only powered by the electric energy generated by the thermoelectric generator; when the external environment temperature difference is too small, namely the temperature difference of the cold end and the hot end of the thermoelectric generator is too small, the electric energy generated by the thermoelectric generator cannot meet the electric energy required by the work of the temperature difference sensor, the temperature difference sensor is automatically switched to the rechargeable battery, the rechargeable battery supplies power for the temperature difference sensor, and therefore the continuous work of the temperature difference sensor under different environmental conditions is achieved. The temperature difference sensor can operate for a long time under the condition that no external power supply or rechargeable battery is available, the online service life of the temperature difference sensor is greatly prolonged, the temperature difference sensor is maintenance-free, and the temperature difference sensor is very suitable for an unattended operation mode in the power equipment industry.
Preferably, in this embodiment, the second hot end temperature probe is disposed between the second hot end surface and the surface of the switch cabinet body, and is used for detecting the temperature of the second hot end surface. No temperature sensing element is required at the second cold end face. This embodiment only adopts a second hot junction temperature probe to be used for measuring the temperature of second hot terminal surface and thermoelectric generator's output voltage to calculate the temperature difference of the cold and hot terminal surface of the thermoelectric generator and the temperature of the cold and hot terminal surface of second, combine the intrinsic physical properties of component to do the measurement calculation promptly, compare and adopt two independent temperature probe to obtain the temperature of second cold terminal surface respectively, the temperature of second hot terminal surface and obtain the mode of the temperature difference of the cold and hot terminal surface of thermoelectric generator, the system deviation that produces has avoided the performance difference between two independent components, provide the basis for realizing the high accuracy difference in temperature measurement.
More preferably, in this embodiment, the sampling period and the sampling time when the centralized control module samples the temperature of the second hot end face through the second hot end temperature probe and the sampling period and the sampling time when the output voltage of the thermoelectric generator is obtained through the voltage sampling circuit are all required to be kept synchronous, so as to avoid the difference of dynamic processes. Preferably, the sampling period is 30 seconds/time.
Preferably, by adopting the temperature difference sensor and the double-probe temperature sensor provided by the invention, an additional environment temperature sensor is not needed, and the sensor is installed without power failure of primary power equipment, so that the problems that in the prior art, when the sensor needs to be replaced, power failure is needed and the switch cabinet is opened to realize the temperature of the sensor, so that economic loss is caused and the like are solved, the construction process is greatly simplified, and the on-line monitoring of the switch cabinet is optimized.
Meanwhile, the temperature difference sensor and the double-probe temperature sensor can simultaneously monitor the temperature data of two different temperature points, so that the synchronism in the temperature sampling process is ensured, and the deviation caused by different point selection positions in the original engineering mode is optimized. Two independent temperature sensors in the prior art can be replaced by the temperature difference sensor or the double-probe temperature sensor, the total quantity of the sensors used in the engineering is reduced, and the engineering cost is saved.
The temperature difference sensor and the double-probe temperature sensor are internally provided with an ambient temperature algorithm, the position definitions of the hot end face and the cold end face are solidified in advance, and the functional positions of the sensors are not required to be set during engineering construction, so that the installation work of monitoring engineering is simplified, and the probability of configuration errors is reduced.
Preferably, the two-probe temperature sensor should not be too large in external dimensions. Similarly, the overall size of the temperature difference sensor is generally limited by the size of the cold end surface heat sink of the cold end surface of the thermoelectric generator. Therefore, in order to ensure the power taking capability of the temperature difference sensor, the size of the cold end surface cooling fin of the second cold end surface of the temperature difference sensor is as large as possible in the embodiment. Preferably, the overall size of the temperature difference sensor and the dual-probe temperature sensor in the embodiment is not more than 50mm × 50mm × 50 mm.
Preferably, the present invention further provides another embodiment, a non-intrusive online monitoring and diagnosing method for a switch cabinet, as shown in fig. 12, including the following steps:
and S1, distributing the non-intrusive temperature sensors at the position of a temperature rise key point on the surface of the cabinet body of the switch cabinet, and simultaneously connecting each non-intrusive temperature sensor with the background system in a communication manner.
And step S2, calculating the lumped heat source temperature of the switch cabinet by each non-intrusive temperature sensor according to the temperature of the hot end face and the temperature of the cold end face of the non-intrusive temperature sensor and a non-intrusive algorithm model which is configured in advance.
And step S3, uploading the calculated temperature of the lumped heat source of the switch cabinet to a background system, so that the background system diagnoses the operation state of the switch cabinet according to the temperature of the lumped heat source of the switch cabinet and a fault diagnosis threshold preset in the system.
Further, in step S3, the background system further determines whether to alarm according to the diagnosis result, and obtains a schematic diagram of temperature distribution in the switch cabinet according to the distribution position of each non-intrusive temperature sensor and the temperature of the lumped heat source of the switch cabinet.
Further, step S2 is preceded by: and each intrusive temperature sensor receives the model parameters of the non-intrusive algorithm model sent by the background system and performs configuration updating on the stored model parameters of the non-intrusive algorithm model.
Further, step S3 includes receiving an upload instruction sent by the background system, and uploading data stored in the background system according to the upload instruction.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A non-intrusive online monitoring and diagnosing system of a switch cabinet is characterized by comprising a plurality of non-intrusive temperature sensors and a background system, wherein the non-intrusive temperature sensors and the background system are distributed on the surface of a cabinet body of the switch cabinet; each non-intrusive temperature sensor is provided with a cold end face and a hot end face; each non-intrusive temperature sensor is arranged on the surface of the cabinet body of the switch cabinet, and the hot end surface of the non-intrusive temperature sensor is in direct contact with the surface of the cabinet body of the switch cabinet; each non-intrusive temperature sensor is in communication connection with the background system and used for calculating the temperature of a lumped heat source of the switch cabinet according to the temperature of the hot end face, the temperature of the cold end face and a pre-configured non-intrusive algorithm model and uploading the calculated temperature of the lumped heat source of the switch cabinet to the background system, so that the background system diagnoses the running state of the switch cabinet according to a fault diagnosis threshold preset by the system.
2. The non-intrusive on-line monitoring and diagnosing system of a switch cabinet as defined in claim 1, wherein each non-intrusive temperature sensor includes a centralized control module; the centralized control module is in communication connection with the background system and is used for calculating the temperature of a lumped heat source of the switch cabinet according to the temperature of the hot end face and the temperature of the cold end face of each non-intrusive temperature sensor and the non-intrusive algorithm model;
wherein the lumped heat source temperature theta of the switch cabinet1(t) is:
wherein, theta2(t) is the temperature of the hot end face; theta3(t) is the temperature of the cold end face; a. the12The heat transfer thermal resistance coefficient between the lumped heat source and the hot end surface of the switch cabinet is constant; a. the23Is the heat transfer thermal resistance coefficient between the hot end surface and the cold end surface and is a constant; b is12The thermal capacitance coefficient is the sum of all substances in the hot end surface and the isothermal surface of the switch cabinet and is a constant; t is the sensor sampling time, then
Is the derivative of temperature with respect to time.
3. The non-intrusive on-line monitoring and diagnosing system of a switch cabinet as defined in claim 2, wherein the non-intrusive temperature sensor further comprises a wireless communication module and a data storage module; the centralized control module is in communication connection with the background system through the wireless communication module; the data storage module is electrically connected with the centralized control module and is used for storing the configured non-intervention algorithm model, the temperature of the hot end face, the temperature of the cold end face, the calculated result data and the corresponding sampling time.
4. The non-intrusive on-line monitoring and diagnosing system of a switch cabinet as defined in claim 2, wherein the non-intrusive temperature sensor is a dual-probe temperature sensor; the double-probe temperature sensor is provided with a first hot end surface and a first cold end surface, and the first hot end surface and the first cold end surface are oppositely arranged at the upper end and the lower end of the double-probe temperature sensor; the first hot end face is a hot end face of the non-intrusive temperature sensor, and the first cold end face is a cold end face of the non-intrusive temperature sensor;
the double-probe temperature sensor is arranged on the surface of the switch cabinet body, and the first hot end surface is in direct contact with the surface of the switch cabinet body; the double-probe temperature sensor comprises a first hot end temperature probe, a cold end temperature probe and a power supply module;
the first hot end temperature probe is arranged between the first hot end surface and the surface of the switch cabinet body and is used for detecting the temperature of the first hot end surface; the cold end temperature probe is arranged on the first cold end surface and used for detecting the temperature of the first cold end surface; the first hot end temperature probe and the cold end temperature probe are respectively electrically connected with the centralized control module; the power supply module is electrically connected with the centralized control module and is used for providing power supply for the centralized control module; the centralized control module is used for simultaneously obtaining the temperature of the first hot end face through the first hot end temperature probe and the temperature of the first cold end face through the cold end face probe according to a preset time interval, recording sampling time, calculating the temperature of the lumped heat source of the switch cabinet according to the temperature of the first hot end face, the temperature of the first cold end face, the sampling time and a non-intrusive algorithm model configured by the double-probe temperature sensor, and transmitting the temperature of the lumped heat source to the background system.
5. The non-intrusive on-line monitoring and diagnosing system of a switch cabinet as defined in claim 2, wherein the non-intrusive temperature sensor is a temperature difference sensor; the temperature difference sensor comprises a thermoelectric generator, a voltage sampling circuit and a second hot end temperature probe; the thermoelectric generator is provided with a second hot end face and a second cold end face, and the second hot end face and the second cold end face are oppositely stacked; the second hot end face is a hot end face of the non-intrusive temperature sensor, and the second cold end face is a cold end face of the non-intrusive temperature sensor;
when the temperature difference sensor is arranged on the surface of the cabinet body of the switch cabinet, the second hot end surface is in direct contact with the surface of the cabinet body of the switch cabinet; the thermoelectric generator can generate output voltage by generating temperature difference between the second hot end surface and the second cold end surface; the centralized control module is electrically connected with the thermoelectric generator through a voltage sampling circuit and is used for acquiring the output voltage of the thermoelectric generator through the voltage sampling circuit;
the second hot end temperature probe is arranged between the second hot end surface and the surface of the switch cabinet body and is used for detecting the temperature of the second hot end surface; the centralized control module is electrically connected with the second hot end temperature probe and is used for acquiring the temperature of the second hot end face through the second hot end temperature probe; the centralized control module is used for simultaneously sampling the second hot end temperature probe according to a preset time interval to obtain the temperature of the second hot end face and the output voltage of the thermoelectric generator through the voltage sampling circuit, recording the sampling time, then obtaining the temperature difference between the second hot end face and the second cold end face and the temperature of the second cold end face according to the temperature of the second hot end face, the output voltage of the thermoelectric generator and the sampling time, and calculating the lumped heat source temperature of the switch cabinet according to the temperature of the second hot end face, the temperature of the second cold end face and a non-intrusive algorithm model configured by the temperature difference sensor and transmitting the lumped heat source temperature to the background system.
6. The non-intrusive on-line monitoring and diagnosis system for switch cabinets of claim 5, wherein the temperature difference sensor further comprises a rechargeable battery and a power management module; one end of the power management module is electrically connected with the rechargeable battery, and the other end of the power management module is electrically connected with the thermoelectric generator, and is used for acquiring electric energy generated by the thermoelectric generator and storing and/or charging the rechargeable battery; the power management module is electrically connected with the centralized control module and used for supplying power to the centralized control module; when the electric energy generated by the thermoelectric generator does not meet the electric energy required by the operation of the temperature difference sensor, the rechargeable battery supplies power to the centralized control module; when the electric energy generated by the thermoelectric generator supplies power for the centralized control module, the rechargeable battery does not supply power.
7. The non-intrusive on-line monitoring and diagnosing system of the switch cabinet as claimed in claim 1, wherein the background system comprises an on-line monitoring and diagnosing unit, a model management unit and a configuration unit; the online monitoring and diagnosing unit is used for receiving monitoring data sent by each non-intrusive temperature sensor and the calculated lumped heat source temperature of the switch cabinet, diagnosing the operation state of the switch cabinet according to a fault diagnosis threshold preset by the system and/or judging whether to give an alarm according to a diagnosis result; the model management unit is used for optimizing the model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor according to the initial monitoring data, the original equipment ledger information and the switch cabinet load historical data of each non-intrusive temperature sensor and in combination with the non-intrusive algorithm model to obtain corresponding optimized parameters; the configuration unit is used for managing the optimized model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor and sending the corresponding optimized model parameters to the corresponding non-intrusive temperature sensor, so that the model parameters of the non-intrusive algorithm model of the non-intrusive temperature sensor are updated.
8. The system of claim 7, wherein the back-office system optimizes model parameters of the non-intrusive algorithm model of each non-intrusive temperature sensor when the switch cabinet is changed.
9. A non-intrusive on-line monitoring and diagnosing method for a switch cabinet, which is applied to the non-intrusive on-line monitoring and diagnosing system for the switch cabinet as claimed in any one of claims 1 to 8, the monitoring and diagnosing method comprising:
the installation step: distributing a plurality of non-intrusive temperature sensors at the position of a temperature rise key point on the surface of a cabinet body of the switch cabinet, and simultaneously connecting each non-intrusive temperature sensor with a background system in a communication manner;
a calculation step: calculating the temperature of a lumped heat source of the switch cabinet by each non-intrusive temperature sensor according to the temperature of the hot end face and the temperature of the cold end face of the non-intrusive temperature sensor and a non-intrusive algorithm model which is configured in advance;
a diagnosis step: and uploading the calculated lumped heat source temperature of the switch cabinet to a background system, so that the background system diagnoses the operation state of the switch cabinet according to the lumped heat source temperature of the switch cabinet and a fault diagnosis threshold preset in the system.
10. The non-intrusive online monitoring and diagnosing method for the switch cabinet according to claim 9, wherein in the diagnosing step, the background system further determines whether to alarm or not according to the diagnosing result, and obtains a schematic temperature distribution diagram in the switch cabinet according to the distribution position of each non-intrusive temperature sensor and the temperature of a lumped heat source of the switch cabinet.
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| CN117309169A (en) * | 2023-11-29 | 2023-12-29 | 珠海格力电器股份有限公司 | Temperature monitoring alarm device, method and temperature monitoring equipment |
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| CN117309169A (en) * | 2023-11-29 | 2023-12-29 | 珠海格力电器股份有限公司 | Temperature monitoring alarm device, method and temperature monitoring equipment |
| CN117309169B (en) * | 2023-11-29 | 2024-04-05 | 珠海格力电器股份有限公司 | Temperature monitoring alarm device, method and temperature monitoring equipment |
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