CN115808255A - Early warning system and method for overheating of contacts in embedded high-voltage combined electrical appliance - Google Patents
Early warning system and method for overheating of contacts in embedded high-voltage combined electrical appliance Download PDFInfo
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Abstract
The invention belongs to the technical field of high-voltage combined electrical appliances with 72.5 kilovolt and above, and particularly relates to an embedded type high-voltage combined electrical appliance inner contact overheating early warning system and method. The invention is composed of a temperature sensing terminal, a signal repeater and a signal receiver; the temperature sensing terminal is used for converting the real-time sensed temperature into an electric signal and transmitting the electric signal in a low-frequency electromagnetic wave form; the signal repeater is used for receiving the signal transmitted by the temperature sensing terminal, amplifying the signal and transmitting the amplified signal to the signal receiver; the signal receiver is used for receiving the amplified signal and displaying the amplified signal. The invention has the advantages of small volume, high application value, strong anti-interference performance, large radiation power and wide application range. The temperature sensor can be embedded in a shielding case of the conductor contact, and can carry out real-time nondestructive monitoring on the temperature of the contact. The invention is suitable for real-time sensing and overheating early warning of the contact temperature of the high-voltage power equipment with the plum blossom contact or the similar plum blossom contact, and greatly reduces the occurrence rate of short-circuit accidents caused by overheating of the contact.
Description
Technical Field
The invention belongs to the technical field of high-voltage combined electric appliances with voltage levels of 72.5kV and above, and particularly relates to an early warning system and method for overheating of contacts in an embedded high-voltage combined electric appliance.
Background
A totally enclosed Gas Insulated switchgear (Gas Insulated switchgear, abbreviated as GIS) in which circuit breakers, disconnectors, grounding switches, voltage transformers, busbars and other equipment elements are enclosed in a metal casing and filled with SF of a certain pressure 6 The gas acts as an insulator. At present, GIS is widely used in power systems, and most of newly built substations are GIS substation combination electrical equipment. Originally, the metal enclosed type combined electrical apparatus becomes the first choice equipment for the construction of the transformer substation with the advantages of low failure rate, small maintenance amount, long overhaul period and the like. In practice, however, the main conductor of the enclosed busbar is present due to its long lengthThe contact of a plurality of contacts is connected, and the safety operation of the equipment is directly influenced by the contact quality of the contacts.
The function of the isolating switch is to provide an operating circuit when the power equipment normally operates, and when the loop is in power failure or maintenance, a reliable breakpoint is provided, and the safety of the equipment and the personnel is ensured. The isolating switch in the GIS is divided into a bus isolating switch and a line isolating switch according to the function, and is divided into an angle type isolating switch and a linear type isolating switch according to the structural form. The on-off operation of the isolating switch is realized by driving a transmission system by a motor, so that the on-off of the moving contact and the static contact of the isolating switch is realized.
The operation experience shows that the failure rate of the combined electrical equipment is not low due to the production process or field installation conditions, and the insulation flashover and poor contact of the contact are more. Once the combined electrical apparatus breaks down, will bring very big trouble and loss for the fault handling, not only maintenance cycle length influences the power supply, moreover if the improper secondary fault that still derives of processing, increase the processing degree of difficulty. If a 252kV GIS bus conductor has poor contact, the contact is overheated to melt metal, and finally three-phase short circuit is caused. The time for the pre-treatment and post-treatment of the accident is more than three months, and the economic loss and the investment of manpower and material resources are huge. According to statistics, about 2 bad contact accidents occur to the contact of the high-voltage combined electrical apparatus every year. The contact failure is caused by various reasons, such as loose contact spring, clamping stagnation of the driving contact, clamping stagnation of a transmission system of the operating mechanism and the like.
The main reasons for the above-mentioned failures are that the contact is in poor contact, resulting in the contact temperature being too high, and the metal is melted by the high temperature, and finally a short-circuit accident is formed. The real-time monitoring of the temperature of the contact inside the high-voltage combined electrical appliance is always a subject pursued by power workers, infrared imaging temperature measurement is generally carried out as nondestructive testing, when the contact inside the combined electrical appliance is locally overheated, the overheated part can be clearly observed through infrared imaging, and the temperature gradient presents obvious color difference change. But infrared imaging needs to go to the scene regularly, and in the interval period, if the contact head overheats, discovery opportunity is missed. If a temperature sensing system exists, the temperature of the contact can be sensed in real time, when the temperature rises to a critical value, early warning is given out, and power failure treatment measures are taken in time, so that short circuit power failure accidents caused by contact overheating can be avoided.
At present, various sensors for monitoring the contact temperature exist in the market, but most of the sensors are applied to the contact temperature monitoring of a 10kV-40.5kV high-voltage switch cabinet, and no finished product is applied to the practical monitoring of the contact temperature in a high-voltage combined electrical appliance with the voltage level of 72.5kV or above. The main reason for analyzing is that the metal shell of the high-voltage combined electrical apparatus is totally closed, and has strong electromagnetic wave shielding effect, so that the signal is difficult to transmit, and the technology is not well promoted all the time.
Disclosure of Invention
Aiming at the defects in the prior art, through long-term research and development and tests, the invention provides an early warning system and method for contact overheating in an embedded high-voltage combined electrical apparatus. The invention aims to realize the invention aims that in the operation process, the conductor contact comprises a disconnecting switch contact and a conductor bus contact, the temperature of the conductor contact is sensed in real time, and when the temperature of the contact is higher than an early warning threshold value, early warning is sent out.
The technical scheme adopted by the invention for realizing the purpose is as follows:
an early warning system for contact overheating in an embedded high-voltage combined electrical appliance comprises a temperature sensing terminal, a signal repeater and a signal receiver;
the temperature sensing terminal is used for converting the real-time sensed temperature into an electric signal and transmitting the electric signal in a low-frequency electromagnetic wave form;
the signal repeater is used for receiving the signal transmitted by the temperature sensing terminal, amplifying the signal and transmitting the amplified signal to the signal receiver;
the signal receiver is used for receiving the amplified signal and displaying the amplified signal.
Furthermore, the temperature sensing terminal comprises a fastening spring watchband and a signal emitter, wherein the signal emitter is packaged by polytetrafluoroethylene materials and is connected with the fastening spring watchband; the temperature sensing terminal is also provided with a switch.
Furthermore, the temperature sensing terminal is fixed on the plum blossom contact through a fastening spring watchband, and a sliding lock catch with adjustable length is arranged on the fastening spring watchband.
Furthermore, the signal emitter is arranged in a mode that the iron core is vertical to the direction of the magnetic field of the contact to be detected, magnetic lines of force penetrate through the iron core, induction voltage is formed on the secondary coil, and the secondary coil is sequentially connected with the current-limiting resistor, the current-limiting inductor and the energy-storing and voltage-stabilizing module to form a stable voltage source; the other end of the current-limiting inductor is connected with the signal conversion module through the switch; and the signal conversion module is provided with a constant current source and is connected with the data processing module and the signal amplification module.
Furthermore, the low-frequency high-power electromagnetic waves emitted by the temperature sensing terminal can penetrate through the contact shield and the aluminum casting shell of the combined electrical appliance of at least 6 mm.
Furthermore, the receiving terminal comprises an early warning system, converts the received electromagnetic wave signal into a temperature signal and displays the temperature signal on a screen in real time; under the condition that the load current changes little, if the temperature continuously rises for 5 days and the increasing temperature every day is less than 17 ℃, the early warning system sends out a warning signal for prompting; when the daily increase temperature is more than or equal to 17 ℃, the temperature of the contact reaches 105 ℃, the early warning system sends an early warning signal to prompt, and power failure treatment is needed; before power failure treatment, infrared temperature imaging detection, SF6 decomposition product detection and partial discharge electrical measurement of the combined electrical appliance shell are enhanced.
Further, the temperature sensing terminal comprises:
the signal conversion module is used for converting the temperature sensed by the thermistor into an electric signal;
the data processing module is used for calculating the temperature of the tulip contact and converting the analog quantity into the digital quantity;
the signal amplification module is used for further amplifying the received electric signal;
and the signal transmitting module is used for transmitting the amplified electric signals in the form of electromagnetic waves.
An early warning method for overheating of contacts in an embedded high-voltage combined electrical apparatus comprises the following steps:
when load current passes through the conductor, a magnetic field concentric with the conductor is generated, the iron core is arranged in a mode vertical to the direction of the magnetic field, magnetic lines of force pass through the iron core, alternating magnetic flux is induced in the iron core, and the whole circuit generates voltage;
when the system is in short circuit, the current in the magnetic field and the circuit is suddenly increased instantly, the current limiting resistor and the current limiting inductor play a role in limiting current, the current induced in the coil N is also changed along with the change of the load current, and the energy storage and voltage stabilization module stores the current induced in the loop, so that the voltage of the whole loop is stabilized at a fixed value to supply power to the signal conversion module; a constant current source in the signal conversion module sends out current with constant value, when the current is over the thermistor, voltage is generated on the thermistor, the signal conversion module collects voltage signals, and the resistance value at the moment is calculated by using ohm's law;
when the contact and the plum blossom contact finger contact the resistor, the temperature on the plum blossom contact finger gradually rises along with the change of load current, the resistance value of the thermistor is increased, the signal conversion module acquires a constantly changing voltage signal, converts the signal from analog quantity to digital quantity A/D conversion and transmits the signal to the data processing module, the data processing module processes the digital signal, calculates the actual contact temperature, transmits the signal to the signal transmitting module through the signal amplification module, and finally transmits the signal in the form of electromagnetic wave;
the signal transmitted by the temperature sensing terminal is further amplified through the signal repeater, and is received and displayed by the receiving terminal.
A computer device comprises a storage medium, a processor and a computer program which is stored on the storage medium and can run on the processor, wherein when the processor executes the computer program, the processor realizes any step of the method for early warning of contact overheating in an embedded high-voltage combined electrical appliance.
A computer storage medium is stored with a computer program, and the computer program is executed by a processor to realize any step of the method for early warning of contact overheating in an embedded high-voltage combined electrical apparatus.
The invention has the following beneficial effects and advantages:
the invention relates to an updating technology for state perception and real-time monitoring of power equipment, in particular to a monitoring system for real-time perception and overheating early warning of the temperature of a high-voltage combined electrical appliance internal conductor contact, which comprises an isolating switch contact, and is suitable for real-time perception and overheating early warning of the temperature of a high-voltage power equipment contact with a plum blossom contact or a similar plum blossom contact in the operation process, and can effectively prevent short-circuit accidents caused by melting of contact metal when the contact is overheated, so that the occurrence rate of the short-circuit accidents caused by overheating of the contact is remarkably reduced.
The invention belongs to the technical field of high-voltage combined electrical appliances with voltage class of 72.5kV and above, also belongs to the technical field of tank type circuit breakers, and is also suitable for overheating early warning of the temperature of contacts in switch cabinet equipment with voltage class of below 72.5 kV.
The invention has the advantages of small volume, high sensitivity, strong anti-interference performance, large radiation power, wide application range and high application value. The temperature sensing terminal can be embedded in the conductor contact shielding case, is glued by polytetrafluoroethylene insulating materials, is high temperature resistant, cannot influence the uniformity of an electric field in a high-voltage combined electrical appliance, and cannot generate partial discharge. The invention can also carry out nondestructive monitoring on the temperature of the contact in real time, and the monitoring period is adjusted according to the operation and maintenance requirements.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the overall structure of the early warning system of the present invention;
FIG. 2a is a front view of a contact temperature sensing terminal of the present invention;
FIG. 2b is a top view of FIG. 2 a;
FIG. 3 is a schematic view of a fastened spring wristband and signal transmitter according to the present invention;
FIG. 4 is a schematic diagram of a transmitter circuit of the present invention;
FIG. 5 is a schematic diagram of the connection of the early warning system of the present invention;
FIG. 6 is a schematic view of the construction of the shield of the present invention;
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a schematic structural diagram of a tulip contact finger of the present invention;
fig. 9 is a top view of fig. 8.
In the figure: the device comprises a fastening spring watchband 1, a temperature sensing terminal 2, a shielding case 3, a fastening spring 4, a plum blossom contact finger 5, a contact 6, a contact seat 7, a signal conversion module 8, a data processing module 9, a signal amplification module 10, a signal transmitting module 11, an iron core 12, a current limiting resistor 13, a current limiting inductor 14, an energy storage voltage stabilizing module 15, a thermistor 16, a switch 17, a constant current source 18, a coil N, a signal repeater 21, a repeater transmitting antenna 22, a signal receiving antenna 23, a signal display screen 24, a signal adjusting key 25, a signal receiver power plug 26, a high-voltage combined electrical apparatus bus 27, a signal 28 and a metal shell 29.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more detailed description of the present invention will be made in conjunction with the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The solution of some embodiments of the invention is described below with reference to fig. 1-9.
Example 1
The invention provides an embodiment, in particular to an overheating early warning system for a contact in an embedded high-voltage combined electrical appliance, which can sense the temperature of a conductor contact of the high-voltage combined electrical appliance in real time in the operation of the high-voltage combined electrical appliance and send out early warning when the temperature of the contact is higher than an early warning threshold value. The conductor contacts comprise isolation switch contacts.
As shown in fig. 1, fig. 1 is a schematic diagram of the overall structure of the early warning system of the present invention. The invention can be embedded in a conductor contact shielding case, and the system mainly comprises three parts, namely a temperature sensing terminal 2 as a first part, a signal repeater 21 as a second part and a signal receiver as a third part.
A first part: and (4) a temperature sensing terminal.
As shown in fig. 2, fig. 2a is a front view of the contact temperature sensing terminal of the present invention, and fig. 2b is a top view of fig. 2 a. The structure of the high-voltage combined electrical appliance contact is shown in figure 2, and the temperature sensing terminal 2 is used for early warning of contact overheating. This temperature perception terminal 2 passes through 1 fixed connection of fastening spring watchband on the plum blossom contact, utilizes the electromagnetic induction principle, becomes the power of temperature perception circuit work with the main magnetic field of leading conductor to have the energy storage function. The temperature sensing terminal 2 is glued by adopting a polytetrafluoroethylene insulating material, so that the uniformity of an electric field in the high-voltage combined electrical appliance cannot be influenced. When current flows through the conductor, the temperature sensing terminal 2 can sense the temperature of the plum-blossom-shaped contact finger 5 in real time, convert the temperature into an electric signal and emit the electric signal in the form of electromagnetic waves. The signal transmitted by the temperature sensing terminal 2 is further amplified by the repeater and then received and displayed by the receiving terminal. The plum blossom-shaped contact finger 5 is fixed on the contact seat 7 through three fastening springs 4, the shielding case 3 is sleeved on the plum blossom-shaped contact, namely, the system of the invention is embedded in the shielding case 3 and is connected by adopting polytetrafluoroethylene insulating material in a cementing way, and the shielding case 3 plays a role in shielding an electric field and homogenizing voltage. The contact 6 is inserted into the plum blossom contact finger 5 to realize electric connection and conduct current. If the contact 6 and the plum blossom contact finger 5 are in poor contact, the contact resistance of the contact and the plum blossom contact finger 5 is increased, the local temperature is increased under the action of load current, and when the temperature reaches the melting point of metal, the contact is melted, so that a short-circuit accident is caused.
The shielding cover 3 is a shielding cover of the tulip contact, is made of aluminum alloy materials, and is used for homogenizing an electric field inside the contact. The specific structure is shown in fig. 6 and 7, the shielding case 3 is an aluminum alloy case with a hollow upper and lower part, the diameter of the upper opening is matched with the inner diameter of the tulip contact, and the diameter of the lower opening is matched with the outer diameter of the tulip contact. The shielding case 3 is an existing product and is a standard component inside a combined electrical appliance manufacturing enterprise.
The specific structure of the plum blossom-shaped contact finger 5 is shown in fig. 8 and fig. 9, the plum blossom-shaped contact finger 5 is an existing product and is a standard component inside a combined electrical appliance manufacturing enterprise. A plurality of plum blossom contact fingers 5 are connected through a fastening spring 4 to form a plum blossom contact.
According to the requirement of the standard GB11022, when the temperature of the plum-blossom contact finger 5 rises to 105 ℃ due to poor contact, the early warning system gives a warning, and at the moment, power failure maintenance measures should be taken in time to avoid short-circuit accidents.
As shown in fig. 3, fig. 3 is a schematic view showing the construction of a fastened spring band and a signal transmitter of the present invention, which constitute a temperature sensing terminal 2. The temperature sensing terminal 2 is formed by packaging an internal circuit by polytetrafluoroethylene materials and is connected with the fastening spring watchband 1, and the fastening spring watchband 1 is provided with a sliding lock catch with adjustable length and is fastened according to the diameter of the plum blossom contact. Still be equipped with switch 17 on the temperature perception terminal 2, before temperature perception terminal 2 embedding plum blossom contact, open switch 17, temperature perception terminal 2 just is in operating condition.
As shown in fig. 4, fig. 4 is a schematic diagram of a transmitter circuit in the present invention. The function of the emitter is: when current flows through the conductor, the temperature sensing terminal 2 can sense the temperature of the plum-blossom-shaped contact finger 5 in real time, convert the temperature into an electric signal and emit the electric signal in the form of low-frequency electromagnetic waves. The signal emitter is arranged in a way that the iron core is vertical to the direction of the magnetic field, and the magnetic force line penetrates through the iron core to be sequentially connected with the current-limiting resistor, the current-limiting inductor and the energy-storing voltage-stabilizing module to play a role in limiting current; the other end of the current-limiting inductor is connected with the signal conversion module through a switch; and the signal conversion module is provided with a constant current source and is in wireless connection with the data processing module and the signal amplification module.
The specific implementation process of the transmitter is as follows: when a load current passes through the conductors, a magnetic field concentric with the conductors is generated, and the iron core 12 is arranged in a manner perpendicular to the direction of the magnetic field, so that magnetic lines of force can pass through the iron core 12 to induce an alternating magnetic flux in the iron core 12, thereby enabling the whole circuit to generate voltage. The number of turns of the iron core and the number of turns of the coil are set through calculation, and even when the rated current of the main conductor reaches 4000A, the power supply voltage of the temperature sensing terminal is still stable. When the system is short-circuited, the magnetic field suddenly increases instantaneously, the current in the circuit also suddenly increases instantaneously, and the current limiting resistor 13 and the current limiting inductor 14 play a role in limiting current at the moment, so that the loop current cannot suddenly change, and the circuit is burnt out. With the change of the load current, the current induced in the coil N also changes, and in order to obtain a stable voltage source, the energy storage and voltage stabilization module 15 stores the current induced in the loop, so that the voltage of the whole loop is stabilized at a fixed value, and thus, the signal conversion module 8 can be supplied with power. The signal conversion module 8 is provided with a constant current source 18, the constant current source 18 sends out a current i with a constant value, when i flows through the thermistor 16, a voltage is generated on the current i, the signal conversion module 8 collects the voltage signal, and the resistance value at the moment is obtained by using a relation formula of the resistor and the temperature.
Under the condition that the contact resistance of the contact 6 and the plum blossom contact finger 5 is constant, the temperature on the plum blossom contact finger 5 changes along with the change of load current. Along with the rise of the temperature, the resistance value of the thermistor 16 is also increased, the signal conversion module 8 collects a constantly changing voltage signal, converts the signal from an analog quantity to a digital quantity (A/D conversion) and transmits the digital quantity to the data processing module 9, and the data processing module 9 processes the digital signal and corrects the digital signal by using a formula (1):
wherein Rt is the resistance of the thermistor at the temperature of T1; r 0 The thermistor is at T 2 Nominal resistance at ambient temperature; the B value is an important parameter of the thermistor; t is 1 And T 2 Refers to K degrees, kelvin temperature, K =273.15 (absolute temperature) + degrees celsius. From the equation (1), the actual temperature value T can be determined 1 I.e. by
The data processing module 9 calculates the actual contact temperature according to the formula (2), transmits the signal to the signal transmitting module 11 through the signal amplifying module 10, and finally transmits the signal in the form of electromagnetic wave. The signal amplification module 10 is an integrated amplification circuit, and the signal transmission module 11 is a spherical transmission antenna.
The temperature sensing terminal 2 includes:
and the signal conversion module 8 is used for converting the temperature sensed by the thermistor 16 into an electric signal.
And the data processing module 9 is used for calculating the temperature of the tulip contact and converting the analog quantity into the digital quantity.
And a signal amplifying module 10 for further amplifying the electrical signal.
And the signal transmitting module 11 is used for transmitting the electric signals in the form of electromagnetic waves.
A second part: a signal repeater 21. The part includes: signal repeater 21 and repeater transmit antenna are existing commercially available products.
As shown in fig. 5, fig. 5 is a schematic diagram of the connection of the early warning system in the present invention. The signal transmitted by the temperature sensing terminal 2 is further amplified by the signal repeater and is received and displayed by the signal receiving terminal. The early warning system is an algorithm in the receiving terminal, and the receiving terminal converts the received electromagnetic wave signals into temperature signals and displays the temperature signals on a screen in real time. Under the condition that the load current is not changed greatly, if the temperature continuously rises for 5 days and the increasing temperature per day is less than 17 ℃, sending an alarm signal for prompting; when the temperature of the contact reaches 105 ℃ when the daily increase temperature is more than or equal to 17 ℃, an early warning signal is sent to prompt that power failure treatment is needed.
The early warning system comprises a signal repeater 21, a repeater transmitting antenna 22, a signal receiving antenna 23, a signal display screen 24, a signal adjusting button 25 and a signal receiver power plug 26. The high-voltage combined electrical apparatus bus 27 is on the signal 28 that the contact temperature perception terminal station emission on the high-voltage combined electrical apparatus bus contact, there is metal casing 29 outside the said high-voltage combined electrical apparatus. After the temperature sensing terminal 2 senses the temperature of the contact, the signal is processed into an electromagnetic wave signal, since the frequency of the signal 28 is low and the power is high, the signal needs to be amplified by the repeater transmitting antenna 22, and the amplified signal is received by the signal receiving antenna 23 and displayed on the screen of the receiving terminal.
And a third part: a signal receiver. The part includes: a signal receiving antenna 23, a signal display screen 24, a signal adjusting button 25 and a signal receiver power plug 26.
Example 2
The invention also provides an embodiment, and provides an early warning method for overheating of contacts in an embedded high-voltage combined electrical apparatus, which comprises the following steps:
And 2, the temperature sensing terminal 2 senses the ambient temperature, and the signal transmitted by the temperature sensing terminal 2 is amplified through the signal repeater and is received and displayed by the receiving terminal.
And 3, adjusting the occurrence frequency of the signal according to the actual operation and maintenance conditions through the receiving terminal, such as transmitting once per week or transmitting once per month. The monitoring period can also be shortened according to the change of the load, such as under the condition of a large load, after the system is short-circuited, after the system is overhauled, and the like.
And 4, adjusting the early warning value of the temperature, wherein the maximum temperature of the silver-plated metal contact in SF6 gas is 105 ℃ according to the standard specification, and the temperature can be adjusted to be low or high.
And 5, the system has a self-calibration function, and the self-calibration function can be started when the accuracy of the thermistor needs to be calibrated.
Example 3
The invention also provides an embodiment, which is an overheating early warning method for the contacts in the embedded high-voltage combined electrical apparatus, when the isolating switch is selected, the contact seat 7 is a static contact, and the contact 6 is a moving contact.
In specific implementation, the invention relates to an early warning method for overheating of contacts in an embedded high-voltage combined electrical apparatus, which comprises the following steps:
and 2, the temperature sensing terminal 2 senses the ambient temperature, and the signal transmitted by the temperature sensing terminal 2 is amplified through the signal repeater and is received and displayed by the receiving terminal.
And 3, adjusting the occurrence frequency of the signal according to the actual operation and maintenance conditions through the receiving terminal, such as transmitting once per week or transmitting once per month. The monitoring period can also be shortened according to the change of the load, such as under the condition of a large load, after the system is short-circuited, after the system is overhauled, and the like.
And 4, adjusting the early warning value of the temperature, wherein the maximum temperature of the silver-plated metal contact in SF6 gas is 105 ℃ according to the standard specification, and the temperature can be adjusted to be low or high.
And 5, carrying out self-calibration by the system, and starting a self-calibration function when the accuracy of the thermistor needs to be calibrated.
The other steps are the same as those in embodiment 1 or 2.
Example 4
Based on the same inventive concept, the embodiment of the present invention also provides a computer device, which includes a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. And when the processor executes the computer program, the steps of the method for early warning of contact overheating in any embedded high-voltage combined electrical appliance described in the embodiment 1, 2 or 3 are realized.
Example 5
Based on the same inventive concept, the embodiment of the present invention further provides a computer storage medium, where a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, the steps of the method for early warning of contact overheating in any one of the embedded high-voltage combined electrical appliances described in the embodiment 1, 2, or 3 are implemented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the present invention, the terms "connected" and "fixed" should be interpreted broadly, for example, the term "connected" may be a fixed connection, a detachable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be understood that the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description of the present specification, the description of "one embodiment," "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. An overheating early warning system for contacts in an embedded high-voltage combined electrical appliance is characterized in that: the system comprises a temperature sensing terminal, a signal repeater and a signal receiver;
the temperature sensing terminal is used for converting the real-time sensed temperature into an electric signal and transmitting the electric signal in a low-frequency electromagnetic wave form;
the signal repeater is used for receiving the signal transmitted by the temperature sensing terminal, amplifying the signal and transmitting the amplified signal to the signal receiver;
the signal receiver is used for receiving the amplified signal and displaying the amplified signal.
2. The early warning system for the overheating of the contact in the embedded high-voltage combined electrical appliance according to claim 1, which is characterized in that: the temperature sensing terminal comprises a fastening spring watchband and a signal emitter, and the signal emitter is packaged by a polytetrafluoroethylene material and connected with the fastening spring watchband; the temperature sensing terminal is also provided with a switch.
3. The system of claim 1, wherein the system comprises: the temperature sensing terminal is fixed on the plum blossom contact through a fastening spring watchband, and a sliding lock catch with adjustable length is arranged on the fastening spring watchband.
4. The system of claim 2, wherein the system comprises: the signal emitter is arranged in a way that the iron core is vertical to the magnetic field direction of the contact to be detected, magnetic lines of force penetrate through the iron core to form induced voltage on a secondary coil, and the secondary coil is sequentially connected with a current-limiting resistor, a current-limiting inductor and an energy-storing and voltage-stabilizing module to form a stable voltage source; the other end of the current-limiting inductor is connected with the signal conversion module through a switch; and the signal conversion module is provided with a constant current source and is connected with the data processing module and the signal amplification module.
5. The early warning system for the overheating of the contact in the embedded high-voltage combined electrical appliance according to claim 1, which is characterized in that: the low-frequency high-power electromagnetic waves emitted by the temperature sensing terminal can penetrate through the contact shielding cover and the aluminum casting shell of the combined electrical appliance of at least 6 mm.
6. The early warning system for the overheating of the contact in the embedded high-voltage combined electrical appliance according to claim 1, which is characterized in that: the receiving terminal comprises an early warning system, converts the received electromagnetic wave signals into temperature signals and displays the temperature signals on a screen in real time; under the condition that the load current changes little, if the temperature continuously rises for 5 days and the increasing temperature every day is less than 17 ℃, the early warning system sends out warning signal prompt; when the daily increase temperature is more than or equal to 17 ℃, the temperature of the contact reaches 105 ℃, the early warning system sends an early warning signal to prompt, and power failure treatment is needed.
7. The early warning system for the overheating of the contact in the embedded high-voltage combined electrical appliance according to claim 1, which is characterized in that: the temperature sensing terminal includes:
the signal conversion module is used for converting the temperature sensed by the thermistor into an electric signal;
the data processing module is used for calculating the temperature of the tulip contact and converting the analog quantity into the digital quantity;
the signal amplification module is used for further amplifying the received electric signal;
and the signal transmitting module is used for transmitting the amplified electric signals in the form of electromagnetic waves.
8. An early warning method for overheating of contacts in an embedded high-voltage combined electrical appliance is characterized by comprising the following steps: the method comprises the following steps:
when load current passes through the conductor, a magnetic field concentric with the conductor is generated, the iron core is arranged in a mode vertical to the direction of the magnetic field, magnetic lines of force pass through the iron core, alternating magnetic flux is induced in the iron core, and the whole circuit generates voltage;
when the system is in short circuit, the current in the magnetic field and the circuit is suddenly increased instantly, the current limiting resistor and the current limiting inductor play a role in limiting current, the current induced in the coil N is also changed along with the change of the load current, and the energy storage and voltage stabilization module stores the current induced in the loop, so that the voltage of the whole loop is stabilized at a fixed value to supply power to the signal conversion module; a constant current source in the signal conversion module sends out a current with a constant value, when the current passes through the thermistor, a voltage is generated on the thermistor, the signal conversion module collects a voltage signal, and the current resistance value is obtained by using ohm's law;
when the contact and the plum blossom contact finger contact the resistor, the temperature on the plum blossom contact finger gradually rises along with the change of load current, the resistance value of the thermistor is increased, the signal conversion module acquires a constantly changing voltage signal, converts the signal from analog quantity to digital quantity A/D conversion and transmits the signal to the data processing module, the data processing module processes the digital signal, calculates the actual contact temperature, transmits the signal to the signal transmitting module through the signal amplifying module, and finally transmits the signal in the form of electromagnetic wave;
the signal transmitted by the temperature sensing terminal is further amplified through the signal repeater, and is received and displayed by the receiving terminal.
9. A computer device comprising a storage medium, a processor and a computer program stored on the storage medium and operable on the processor, wherein the processor executes the computer program to implement the steps of the method for early warning of contact overheating in an embedded high-voltage combined electrical apparatus according to any one of claims 1 to 8.
10. A computer storage medium, comprising: the computer storage medium stores a computer program, and the computer program when executed by a processor implements the steps of the method for early warning of overheating of contacts in an embedded high-voltage combined electrical apparatus according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211543275.0A CN115808255A (en) | 2022-12-02 | 2022-12-02 | Early warning system and method for overheating of contacts in embedded high-voltage combined electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211543275.0A CN115808255A (en) | 2022-12-02 | 2022-12-02 | Early warning system and method for overheating of contacts in embedded high-voltage combined electrical appliance |
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| Publication Number | Publication Date |
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| CN115808255A true CN115808255A (en) | 2023-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211543275.0A Pending CN115808255A (en) | 2022-12-02 | 2022-12-02 | Early warning system and method for overheating of contacts in embedded high-voltage combined electrical appliance |
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| Country | Link |
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| CN (1) | CN115808255A (en) |
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2022
- 2022-12-02 CN CN202211543275.0A patent/CN115808255A/en active Pending
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