CN114994471A - Heat accumulator insulation performance detection and protection device and method - Google Patents
Heat accumulator insulation performance detection and protection device and method Download PDFInfo
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- CN114994471A CN114994471A CN202210554092.2A CN202210554092A CN114994471A CN 114994471 A CN114994471 A CN 114994471A CN 202210554092 A CN202210554092 A CN 202210554092A CN 114994471 A CN114994471 A CN 114994471A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a heat accumulator insulation performance detection and protection device and a method, comprising the following steps: a plurality of detection points are arranged in the heat accumulator, each detection point is provided with a thermocouple, a preset temperature threshold value is set according to the principle that the thermocouple 11 outputs larger thermal electromotive force due to partial discharge, when the signal processing module 12 makes a difference between the temperature value obtained by the measurement of the large thermoelectromotive force and the temperature value at the corresponding moment on the preset temperature curve, and the absolute value of the difference exceeds the preset temperature threshold, the temperature value at the current moment fluctuates, when the fluctuation frequency of the temperature value acquired in the preset sampling period exceeds the preset frequency, the insulation performance of the heat accumulator is judged to be damaged, so that no additional equipment is needed on the basis of the original design, the functional expansion of thermocouple temperature measurement can be realized, the fault trip rate of a power supply system is greatly reduced, the equipment damage caused by partial electrical faults is avoided, and meanwhile, the detection means can also be used as the detection means of the heat accumulator insulation structure design.
Description
Technical Field
The invention relates to the field of new energy consumption, in particular to a heat accumulator insulation performance detection and protection device and method.
Background
The development and utilization of renewable energy sources are accelerated, the global energy Internet is constructed, and the method is a necessary way for promoting the energy revolution and realizing clean development. The renewable energy is accessed in a large area, so that the difficulty of peak regulation of a power grid is aggravated, phenomena of wind abandoning, light abandoning and the like are frequently caused, the waste of clean energy is serious, great challenges are brought to safe and stable operation of the conventional power system, and the development of an advanced and efficient large-scale energy type energy storage technology is urgently needed, so that the impact of the renewable energy on the power grid is effectively relieved, and the flexible regulation capability of the power grid is improved.
The solid electric heat storage device is one of the most effective schemes at present when used as an energy storage system to participate in the renewable energy consumption, the consumption capacity of a power grid to the renewable energy can be improved, the stability of the power grid is maintained, and the carbon emission caused by coal-fired heating in northern areas is reduced. The further improvement of the heat storage capacity of the solid electric heat storage device is the development direction of the solid electric heat storage device at present, and the increase of the voltage level and the increase of the input power are necessary means of the technical route. As the voltage levels increase, solid electrical thermal storage devices are more susceptible to electrical failures caused by insulation during operation, which can seriously affect the safe operation of the equipment.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to solve the problem of how to detect the insulation performance of the solid electric heat storage device in the prior art, so as to provide a heat storage body insulation performance detection and protection device and method.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a heat accumulator insulation performance detection apparatus, including: the heat storage device comprises a plurality of thermocouples and a signal processing module, wherein the hot end of each thermocouple is inserted into any gap in the heat accumulator, the cold end of each thermocouple is connected with the signal processing module, and the gap is a gap between two adjacent heat storage materials in the heat accumulator; the signal processing module acquires a temperature value corresponding to a thermoelectric potential analog signal output by the cold end of each thermocouple in real time, compares the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judges whether the acquired temperature value fluctuates or not; and when the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
In one embodiment, the signal processing module includes: the system comprises a signal conditioning unit, an analog-to-digital conversion unit and a judgment unit, wherein the input end of the signal conditioning unit is connected with the cold end of each thermocouple, and the output end of the signal conditioning unit is connected with the input end of the analog-to-digital conversion unit; the signal conditioning unit is used for amplifying, filtering and denoising the thermoelectric potential analog signal; the output end of the analog-to-digital conversion unit is connected with the input end of the judgment unit; the analog-to-digital conversion unit is used for converting the thermoelectric potential analog signal into a thermoelectric potential digital signal; the judgment unit calculates a corresponding temperature value based on the thermoelectric potential digital signal, compares the temperature value with a preset temperature threshold value, and judges that the insulation performance of the heat accumulator is damaged when the temperature value exceeds the preset temperature threshold value.
In one embodiment, the heat accumulator insulation performance detection apparatus further includes: and the alarm module is connected with the output end of the signal processing module, and alarms when the judgment unit judges that the insulation performance of the heat accumulator is damaged.
In one embodiment, the heat accumulator insulation performance detection apparatus further includes: and the communication module is connected with the output end of the signal processing module and is used for realizing data transmission between the signal processing module and the upper computer.
In one embodiment, the heat accumulator insulation performance detection apparatus further includes: and the power supply module is connected with the signal processing module and is used for supplying power to the signal processing module.
In a second aspect, an embodiment of the present invention provides a protection device for a heat storage body, including: the heat accumulator insulation performance detection device comprises a heat accumulator insulation performance detection device and a control module, wherein the input end of the control module is connected with the output end of a signal processing module; when the signal processing module judges that the insulation performance of the heat accumulator is damaged, the control module controls the power-off of the heat accumulator.
In a third aspect, an embodiment of the present invention provides a method for detecting insulation performance of a heat accumulator, including: acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator; comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not; when the temperature value at the current moment fluctuates, judging whether the fluctuation times of the temperature value acquired in a preset sampling period exceed the preset times or not; and when the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
In an embodiment, a process of comparing a temperature value at a current time with a temperature value at a corresponding time on a preset temperature curve and determining whether the obtained temperature value fluctuates includes: the temperature value at the current moment is differed from the temperature value at the corresponding moment on the preset temperature curve to obtain a temperature difference value; judging whether the absolute value of the temperature difference value exceeds a preset temperature threshold value or not; and when the absolute value of the temperature difference exceeds a preset temperature threshold value, judging that the obtained temperature value fluctuates.
In one embodiment, the heat accumulator insulation performance detection method further includes: when the heat accumulator insulation performance is damaged, an alarm signal is sent out.
In a fourth aspect, an embodiment of the present invention provides a method for protecting a heat storage body, including: acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator in real time; comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not; comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not; when the temperature value at the current moment fluctuates, judging whether the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times or not; and when the fluctuation frequency of the temperature value acquired in the preset sampling period exceeds the preset frequency, judging that the insulation performance of the heat accumulator is damaged, and controlling the power-off of the heat accumulator.
The technical scheme of the invention has the following advantages:
according to the heat accumulator insulation performance detection device provided by the invention, a plurality of detection points are arranged in a heat accumulator, each detection point is provided with a thermocouple, a preset temperature threshold value is set according to the principle that the thermocouple 11 outputs larger thermal electromotive force due to partial discharge, and when the temperature measured by a signal processing module 12 based on the larger thermal electromotive force exceeds the preset temperature threshold value, the insulation performance of the heat accumulator is judged to be damaged, so that the functional expansion of thermocouple temperature measurement can be realized without adding new equipment on the basis of the original design, the fault trip rate of a power supply system is greatly reduced, and the equipment damage caused by partial electrical faults is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1(a) is a view showing the internal structure of a heat storage body according to an embodiment of the present invention;
fig. 1(b) is a composition diagram of a specific example of a heat accumulator insulation performance detection apparatus according to an embodiment of the present invention;
fig. 2 is a composition diagram of another specific example of the heat accumulator insulation performance detection apparatus according to the embodiment of the invention;
fig. 3 is a composition diagram of another specific example of the heat accumulator insulation performance detection apparatus according to the embodiment of the invention;
fig. 4 is a composition diagram of another specific example of the heat accumulator insulation performance detection apparatus according to the embodiment of the invention;
fig. 5 is a composition diagram of another specific example of the heat accumulator insulation performance detection apparatus according to the embodiment of the invention;
FIG. 6 is a composition diagram showing a specific example of a heat accumulator protection apparatus according to an embodiment of the present invention;
fig. 7 is a flowchart of a specific example of a method for detecting the insulating property of a heat storage body according to an embodiment of the present invention.
Reference numerals:
1-heat accumulator insulation performance detection device; 2-a control module; 11-a thermocouple; 12-a signal processing module; 13-an alarm module; 14-a communication module; 15-a power supply module; 121-a signal conditioning unit; 122-analog-to-digital conversion unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides a heat accumulator insulation performance detection apparatus, as shown in fig. 1(a), where a heat accumulator is composed of an insulating layer and a plurality of heat storage materials, and an electric heating alloy is used to heat the heat accumulator, as shown in fig. 1(b), the heat accumulator insulation performance detection apparatus includes: a plurality of thermocouples 11 and a signal processing module 12.
As shown in fig. 1(a) and 1(b), the hot end of each thermocouple 11 is inserted into any gap inside the heat accumulator, the cold end of each thermocouple 11 is connected with the signal processing module 12, the gap is a gap between two adjacent heat storage materials inside the heat accumulator, and the thermocouple needs to have a sufficient electrical insulation distance from the electrical heating alloy; the signal processing module 12 obtains a temperature value corresponding to the thermoelectric potential analog signal output by the cold end of each thermocouple 11 in real time, compares the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judges whether the obtained temperature value fluctuates; and when the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
Specifically, in the embodiment of the invention, a plurality of detection points are arranged in the heat accumulator, the hot end of a thermocouple 11 is inserted into one detection point at a gap between two adjacent heat storage materials at each detection point, the working principle of the thermocouple 11 is that two material conductors with different components form a closed loop, and when temperature gradients exist at the two ends, current passes through the loop to generate voltage.
Specifically, as the heat storage body is put into operation, the temperature inside the heat storage body will rise continuously, and the insulating property of the heat storage material inside the heat storage body is partially degraded by the rise in temperature. When the electric heating alloys in the thermal storage body are arranged too densely or the insulation distance between the electric heating alloys and the ground potential is insufficient, the voltage difference between two adjacent electric heating alloys is too large, and a partial discharge phenomenon is caused, at this time, the isolation layer (i.e., the heat storage material or the air) between the two electric potentials is not completely broken down, and the thermal inertia of the thermal storage body is large, so that the temperature of the thermal storage body cannot be suddenly changed, and therefore the thermal electromotive voltage generated by the adjacent thermocouple 11 due to the temperature influence is extremely low, but the thermocouple 11 generates a large thermal electromotive force due to the discharge influence of the adjacent high-voltage charged body, so that the temperature measured by the signal processing module 12 based on the large thermal electromotive force is severely fluctuated, in the embodiment of the present invention, a preset temperature threshold is set for the principle that the thermocouple 11 outputs a large thermal electromotive force due to local discharge, and the signal processing module 12 sets a preset temperature threshold based on the temperature value measured by the large thermal electromotive force corresponding to a preset temperature curve when the temperature measured by the large thermal electromotive force corresponds to the preset temperature curve And (3) making a difference between the temperature values, judging that the temperature value obtained at the current moment fluctuates when the absolute value of the difference value of the two temperature values exceeds the preset temperature threshold value, and judging that the insulation performance of the heat accumulator is damaged when the fluctuation times in a preset sampling period exceed the preset times.
It should be noted that the preset temperature curve in the embodiment of the present invention may be a curve described by historical measurement data, or may be a curve described by a quantity obtained by a large number of test experiments, and is not limited herein.
In one embodiment, as shown in fig. 2, the signal processing module 12 includes: a signal conditioning unit 121, an analog-to-digital conversion unit 122, and a judgment unit 123.
As shown in fig. 2, an input end of the signal conditioning unit 121 is connected to a cold end of each thermocouple 11, and an output end of the signal conditioning unit 121 is connected to an input end of the analog-to-digital conversion unit 122; the signal conditioning unit 121 is configured to amplify, filter, and denoise the thermoelectric voltage analog signal.
Specifically, the signal conditioning unit 121 according to the embodiment of the present invention may be composed of an amplifying circuit and a filtering circuit, where the basic element of the amplifying circuit may be an operational amplifier, and the filtering circuit may be a circuit commonly used in the prior art, for example: a differential low-pass filter and a common-mode filter, which are not limited herein.
As shown in fig. 2, the output end of the analog-to-digital conversion unit 122 is connected with the input end of the judgment unit 123; the analog-to-digital conversion unit 122 is used to convert the thermoelectric-potential analog signal into a thermoelectric-potential digital signal.
Specifically, in the embodiment of the present invention, a digital filter may be further disposed between the analog-to-digital conversion unit 122 and the determination unit 123, so as to filter the thermoelectric-voltage digital signal again, and further improve the detection accuracy.
As shown in fig. 2, the judgment unit 123 calculates a corresponding temperature value based on the thermoelectric-voltage digital signal, compares the temperature value with a preset temperature threshold, and judges that the insulation performance of the heat storage body is damaged when the temperature value exceeds the preset temperature threshold.
Specifically, the determining unit 123 according to the embodiment of the present invention is a digital chip, and the chip can be manually inputted with a preset temperature threshold by a detection person, and the preset temperature threshold can be set according to performance parameters of each material inside the heat storage body, which is not limited herein. In addition, in the embodiment of the present invention, the analog-to-digital conversion unit 122 may be omitted, and the signal conditioning unit 121 may be directly connected to the determination unit 123, but in this connection manner, if the determination unit 123 is an analog circuit, it is necessary to use a voltage corresponding to a preset temperature threshold as a reference voltage of the determination unit 123, and the determination unit 123 determines whether the thermoelectric-voltage analog signal exceeds the reference voltage, and when the thermoelectric-voltage analog signal exceeds the reference voltage, it determines that the insulation performance of the heat storage body is damaged.
It should be noted that, the embodiment of the present invention utilizes the thermocouple 11 having the hot end and the cold end, but when other types of thermocouples 11 can be used, the insulation performance detection apparatus and method provided by the embodiment of the present invention can still be used, and are not limited herein.
In one embodiment, as shown in fig. 3, the heat accumulator insulation performance detection apparatus further includes: and the alarm module 13 is connected with the output end of the signal processing module 12, and when the signal processing module 12 judges that the insulation performance of the heat accumulator is damaged, the alarm module 13 gives an alarm.
The alarm module 13 of the embodiment of the present invention may be a display unit or a sound unit, and when the alarm module is a display unit, the display unit may be a light display (for example, a light emitting diode) or an LED screen display, and when the alarm module is a sound unit, the display unit may be a buzzer alarm, but the examples are only given, and the present invention is not limited thereto.
In one embodiment, as shown in fig. 4, the heat accumulator insulation performance detection apparatus further includes: and the communication module 14, the communication module 14 is connected with the output end of the signal processing module 12, and the communication module 14 is used for realizing data transmission between the signal processing module 12 and an upper computer.
Specifically, the inspector can transmit parameters such as a preset temperature threshold, a preset number of times, a preset temperature curve to the signal processing module 12 through the upper computer to configure, start and stop the work of the signal processing module 12, and the signal processing module 12 can transmit parameters such as the temperature corresponding to the detected thermoelectric potential digital signal, the heat accumulator insulation performance and the like to the upper computer.
In one embodiment, as shown in fig. 5, the heat accumulator insulation performance detection apparatus further includes: and the power supply module 15 is connected with the signal processing module 12, and the power supply module 15 is used for supplying power to the signal processing module 12.
Specifically, the power supply module of the embodiment of the present invention mainly supplies power to the signal processing module 12 and each unit inside the signal processing module, and it can be understood that the power supply module may be connected to an external power source such as a commercial power source, an alternating current power source, a direct current power source, and the like, and a circuit in the power supply module is not limited to a rectifier circuit, a DC-DC circuit, and the like, and is not limited herein.
Example 2
An embodiment of the present invention provides a protection device for a heat storage body, as shown in fig. 6, including: the heat accumulator insulation performance detection device 1 and the control module 2 according to embodiment 1, wherein an input end of the control module 2 is connected to an output end of the signal processing module 12, and when the signal processing module 12 determines that the heat accumulator insulation performance is damaged, the control module controls the power off of the heat accumulator.
Specifically, in the embodiment of the present invention, a plurality of detection points are arranged inside a heat storage body, a hot end of one thermocouple 11 is inserted into one detection point at a gap between two adjacent heat storage materials at each detection point, a cold end of each thermocouple 11 is connected with a signal processing module 12, when the arrangement of the electric heating alloys inside the heat storage body is too dense or the insulation distance from the ground potential is insufficient, the voltage difference between the two adjacent electric heating alloys is too large, which results in a partial discharge phenomenon, the thermocouple 11 can generate a large thermal electromotive force due to the influence of the discharge of the adjacent high-voltage charged body, so that the temperature measured by the signal processing module 12 based on the large thermal electromotive force fluctuates sharply, when the temperature value measured by the signal processing module 12 based on the large thermal electromotive force differs from the temperature value at the corresponding time on a preset temperature curve, and the absolute value of the difference between the two exceeds the preset temperature threshold, and judging that the temperature value acquired at the current moment fluctuates, judging that the insulation performance of the heat accumulator is damaged when the fluctuation frequency in a preset sampling period exceeds a preset frequency, and controlling the power-off of the heat accumulator by the control module 2 according to the judgment result of the signal processing module 12 so as to avoid the damage and insulation breakdown in the heat accumulator.
Example 3
An embodiment of the present invention provides a method for detecting insulation performance of a heat accumulator, as shown in fig. 7, including:
step S11: and acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator in real time.
Step S12: and comparing the temperature value at the current moment with the temperature value at the corresponding moment on the preset temperature curve, and judging whether the obtained temperature value fluctuates. .
Step S13: when the temperature value at the current moment fluctuates, whether the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times is judged.
Step S14: and when the fluctuation times of the temperature values acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
Specifically, based on the heat accumulator insulation performance detection device provided in embodiment 1, in the embodiment of the present invention, a plurality of detection points are arranged in the heat accumulator, a gap between two adjacent heat storage materials in each detection point is inserted into a hot end of a thermocouple, a cold end of each thermocouple is connected to a signal processing module, when the electric heating alloys in the heat accumulator are arranged too densely or the insulation distance from the ground potential is insufficient, the voltage difference between the two adjacent electric heating alloys is too large, which causes a partial discharge phenomenon, the thermocouple generates a large thermal electromotive force due to the discharge influence of the adjacent high-voltage charged body, so that the temperature measured by the signal processing module based on the large thermal electromotive force fluctuates sharply, and when the temperature measured by the signal processing module based on the large thermal electromotive force is different from the temperature value at the corresponding time on the preset temperature curve, when the absolute value of the difference value of the two exceeds the preset temperature threshold value, the temperature value obtained at the current moment is judged to fluctuate, and when the fluctuation times within the preset sampling period exceed the preset times, the insulation performance of the heat accumulator can be judged to be damaged.
In addition, the technical scheme disclosed in the embodiment of the invention is a device and a method for judging the insulation performance in the heat accumulator in a thermocouple-assisted manner, but the partial discharge phenomenon is caused by the overlarge voltage difference between two adjacent electric heating alloys, so that the partial discharge detection can be carried out in the heat accumulator, and when the discharge voltage or current exceeds a threshold value, the insulation performance of the heat accumulator is judged to be damaged.
In an embodiment, the process of obtaining the temperature value corresponding to the thermoelectric-voltage analog signal includes:
amplifying, filtering and denoising the thermoelectric potential analog signal; converting the thermoelectric potential analog signal into a thermoelectric potential digital signal; based on the thermoelectric potential digital signal, a corresponding temperature value is calculated.
Specifically, in order to accurately judge whether the insulation performance of the heat accumulator is damaged, a series of filtering processes are required to be performed on the thermoelectric-voltage analog signal, and the filtering is not limited to common-mode filtering, low-pass filtering and the like.
In a specific embodiment, the process of comparing the temperature value at the current moment with the temperature value at the corresponding moment on the preset temperature curve and determining whether the obtained temperature value fluctuates includes: the temperature value at the current moment is differed from the temperature value at the corresponding moment on the preset temperature curve to obtain a temperature difference value; judging whether the absolute value of the temperature difference value exceeds a preset temperature threshold value or not; and when the absolute value of the temperature difference exceeds a preset temperature threshold value, judging that the obtained temperature value fluctuates. The preset temperature curve may be a curve described by historical measurement data, or a curve described by a quantity obtained by a large number of test experiments, and is not limited herein.
In a specific embodiment, the method further comprises: when the heat accumulator insulation performance is damaged, an alarm signal is sent out, wherein the alarm signal is not limited to sound and light alarm.
Example 4
The embodiment of the invention provides a method for protecting a heat accumulator, which comprises the following steps: acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator in real time; comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not; comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not; when the temperature value at the current moment fluctuates, judging whether the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times or not; and when the fluctuation frequency of the temperature value acquired in the preset sampling period exceeds the preset frequency, judging that the insulation performance of the heat accumulator is damaged, and controlling the power-off of the heat accumulator.
Specifically, in the embodiment of the invention, a plurality of detection points are arranged in a heat accumulator, a hot end of a thermocouple is inserted into one detection point at a gap between two adjacent heat storage materials at each detection point, a cold end of each thermocouple is connected with a signal processing module, when the arrangement of electric heating alloys in the heat accumulator is too dense or the insulation distance between the electric heating alloys and ground potential is insufficient, the voltage difference between the two adjacent electric heating alloys is too large to cause a local discharge phenomenon, the thermocouple can generate larger thermal electromotive force due to the discharge influence of an adjacent high-voltage charged body, so that the temperature measured by the signal processing module based on the larger thermal electromotive force is severely fluctuated, when the temperature value measured by the signal processing module based on the larger thermal electromotive force is different from the temperature value at the corresponding moment on a preset temperature curve, and the absolute value of the difference value of the two temperature values exceeds the preset temperature threshold value, the temperature value obtained at the current moment is judged to fluctuate, when the fluctuation times in the preset sampling period exceed the preset times, the insulation performance of the heat accumulator can be judged to be damaged, and the control module controls the power-off of the heat accumulator according to the judgment result of the signal processing module, so that the damage of the heat accumulator is avoided.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A heat accumulator insulating property detection device is characterized by comprising: a plurality of thermocouples and a signal processing module, wherein,
the hot end of each thermocouple is inserted into any gap in the heat accumulator, the cold end of each thermocouple is connected with the signal processing module, and the gap is a gap between two adjacent heat storage materials in the heat accumulator;
the signal processing module acquires a temperature value corresponding to a thermoelectric potential analog signal output by the cold end of each thermocouple in real time, compares the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judges whether the acquired temperature value fluctuates or not; and when the fluctuation times of the temperature values acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
2. The heat accumulator insulation performance detection apparatus according to claim 1, wherein the signal processing module includes: a signal conditioning unit, an analog-to-digital conversion unit and a judgment unit, wherein,
the input end of the signal conditioning unit is connected with the cold end of each thermocouple, and the output end of the signal conditioning unit is connected with the input end of the analog-to-digital conversion unit; the signal conditioning unit is used for amplifying, filtering and denoising the thermoelectric potential analog signal;
the output end of the analog-to-digital conversion unit is connected with the input end of the judgment unit; the analog-to-digital conversion unit is used for converting the thermoelectric potential analog signal into a thermoelectric potential digital signal;
and the judging unit calculates a corresponding temperature value based on the thermoelectric potential digital signal, compares the temperature value with the preset temperature threshold value, and judges that the insulation performance of the heat accumulator is damaged when the temperature value exceeds the preset temperature threshold value.
3. The heat accumulator insulation performance detection apparatus according to claim 2, characterized by further comprising:
and the alarm module is connected with the output end of the signal processing module, and alarms when the signal processing module judges that the heat accumulator is damaged in insulating property.
4. The heat accumulator insulation performance detection apparatus according to claim 2, characterized by further comprising:
and the communication module is connected with the output end of the signal processing module and is used for realizing data transmission between the signal processing module and an upper computer.
5. The heat accumulator insulation performance detection apparatus according to claim 2, characterized by further comprising:
and the power supply module is connected with the signal processing module and is used for supplying power to the signal processing module.
6. A protection device for a heat storage body, comprising: the heat accumulator insulation performance detection apparatus, the control module, of any one of claims 1 to 5, wherein,
the input end of the control module is connected with the output end of the signal processing module;
when the signal processing module judges that the insulation performance of the heat accumulator is damaged, the control module controls the power of the heat accumulator to be cut off.
7. A method for detecting the insulating property of a heat accumulator is characterized by comprising the following steps:
acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator in real time;
comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not;
when the temperature value at the current moment fluctuates, judging whether the fluctuation times of the temperature value acquired in a preset sampling period exceed the preset times or not;
and when the fluctuation times of the temperature values acquired in the preset sampling period exceed the preset times, judging that the insulation performance of the heat accumulator is damaged.
8. The method for detecting the insulation performance of the heat accumulator according to claim 7, wherein the step of comparing the temperature value at the current time with the temperature value at the corresponding time on the preset temperature curve and determining whether the obtained temperature value fluctuates comprises:
subtracting the temperature value at the current moment from the temperature value at the corresponding moment on the preset temperature curve to obtain a temperature difference value;
judging whether the absolute value of the temperature difference value exceeds a preset temperature threshold value or not;
and when the absolute value of the temperature difference value exceeds a preset temperature threshold value, judging that the obtained temperature value fluctuates.
9. The heat accumulator insulation performance detection method according to claim 7, further comprising:
and when the insulation performance of the heat accumulator is damaged, an alarm signal is sent out.
10. A method of protecting a thermal mass, comprising:
acquiring temperature values corresponding to thermoelectric potential analog signals of a plurality of positions in the heat accumulator in real time;
comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not;
comparing the temperature value at the current moment with the temperature value at the corresponding moment on a preset temperature curve, and judging whether the obtained temperature value fluctuates or not;
when the temperature value at the current moment fluctuates, judging whether the fluctuation times of the temperature value acquired in the preset sampling period exceed the preset times or not;
and when the fluctuation frequency of the temperature value acquired in the preset sampling period exceeds the preset frequency, judging that the insulation performance of the heat accumulator is damaged, and controlling the power-off of the heat accumulator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117406047A (en) * | 2023-12-14 | 2024-01-16 | 国网山西省电力公司太原供电公司 | Partial discharge state on-line monitoring system of power equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117406047A (en) * | 2023-12-14 | 2024-01-16 | 国网山西省电力公司太原供电公司 | Partial discharge state on-line monitoring system of power equipment |
| CN117406047B (en) * | 2023-12-14 | 2024-02-23 | 国网山西省电力公司太原供电公司 | Partial discharge state on-line monitoring system of power equipment |
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