Low voltage switchgear and monitoring system

Abstract

The application discloses a kind of low-voltage complete switchgear and monitoring system, it is related to electrical equipment technical field, including: controller, with the electrical terminal of a plurality of electrical connections of controller, and the electrical resistance sensor of a one-to-one correspondence setting in electrical terminal;Controller and electrical resistance sensor are connected based on electrical connection circuit, electrical terminal is provided with isolation mechanism, and electrical terminal and electrical connection circuit are formed linkage arrangement based on isolation mechanism;When electrical terminal is in connection state, isolation mechanism is in open state, and electrical connection circuit forms conduction state based on the open state of isolation mechanism;When electrical terminal is in non-connection state, isolation mechanism is in closed state, and electrical connection circuit forms open state based on the closed state of isolation mechanism.The isolation mechanism is set in the position of electrical terminal, realizes the plastic package protection of electrical terminal, cooperates electrical resistance sensor to detect, improves the detection reliability and convenience of low-voltage complete switchgear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a low-voltage switchgear and monitoring system. BACKGROUND

[0002] The low-voltage switchgear refers to the switch control box of the complete equipment used in the voltage level of 380V and below, which is used for controlling the power transmission control between the power network and the low-voltage load. The current low-voltage switchgear mainly detects and calculates the power operation data of the high-voltage end and the load end, so as to realize the evaluation of the operation state of the low-voltage switchgear. The workload of operation is large, the detection data transmission has delay, and the protection and real-time detection of the connection state of the switch electrical terminal of the low-voltage switchgear are not involved. The device is prone to damage when the working load of the low-voltage switchgear increases. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art. The present application provides a low-voltage switchgear and monitoring system. An isolation mechanism is arranged at the electrical terminal position of the low-voltage switchgear to realize the plastic encapsulation protection of the electrical terminal. The connection state of the electrical terminal is detected by the resistance sensor to improve the detection reliability and convenience of the low-voltage switchgear.

[0004] The present application provides a low-voltage switchgear, which comprises a controller, a plurality of electrical terminals electrically connected with the controller, and a plurality of resistance sensors one-to-one corresponding arranged in the electrical terminals.

[0005] The controller and the resistance sensor are connected based on an electrical connection circuit. The electrical terminal is provided with an isolation mechanism. The electrical terminal and the electrical connection circuit are formed in a linkage arrangement based on the isolation mechanism.

[0006] When the electrical terminal is in a connected state, the isolation mechanism is in an open state, and the electrical connection circuit forms a conduction state based on the open state of the isolation mechanism.

[0007] When the electrical terminal is in a non-connected state, the isolation mechanism is in a closed state, and the electrical connection circuit forms an open circuit state based on the closed state of the isolation mechanism.

[0008] Further, the isolation mechanism comprises a silica gel composite isolation cover and a memory alloy spring, and the memory alloy spring is arranged in the silica gel composite isolation cover.

[0009] The silica gel composite isolation cover is provided with a containing groove, and the electrical terminal is located in the containing groove.

[0010] Further, the silica gel composite isolation cover is internally provided with a metal connecting rod, and when the silica gel composite isolation cover is in a folded state, the metal connecting rod is connected with the memory alloy spring in a compressed state.

[0011] The electrical connection circuit forms a conduction circuit based on the connection state of the metal connecting rod and the memory alloy spring.

[0012] Further, the elastic reset elastic force of the memory alloy spring is N1, and the value range of N1 is 5N≤N1≤7N.

[0013] The reset temperature of the memory alloy spring is T1, and the value range of T1 is 120℃≤T1≤150℃.

[0014] The high-temperature reset elastic force of the memory alloy spring is N2, and the value range of N2 is 10N≤N2≤15N.

[0015] Further, the controller is used for acquiring detection data of the resistance sensor, and generating a contact resistance dynamic curve of a corresponding electrical terminal according to the detection data.

[0016] Further, the low-voltage complete switch device further comprises a displacement sensor and a temperature sensor arranged in the isolation mechanism.

[0017] The controller constructs a three-level diagnosis model based on the detection data of the displacement sensor, the temperature sensor and the resistance sensor.

[0018] The application provides a monitoring system of a low-voltage complete switch device, which is used for detecting the low-voltage complete switch device, and comprises:

[0019] A detection assembly is used for detecting connection state data of a plurality of electronic terminals of the low-voltage complete switch.

[0020] A controller is used for constructing a three-level diagnosis model according to the connection state data, and adjusting the connection state of the low-voltage complete switch according to the detection result of the three-level diagnosis model.

[0021] Further, the three-level diagnosis model comprises a displacement detection unit, a resistance detection unit and a temperature detection unit.

[0022] The displacement detection threshold of the displacement detection unit is D, and the value range of D is 0.3mm≤D≤0.5mm.

[0023] The resistance detection threshold of the resistance detection unit is R, and the value range of R is 3mΩ≤R≤5mΩ.

[0024] Further, the temperature detection unit is used to detect the temperature rising rate of the electrical terminal according to the temperature data of the electrical terminal and a differential equation, and adjust the working load of the electrical terminal according to the temperature rising rate.

[0025] Further, the differential equation is:

[0026] ;

[0027] Wherein, is the temperature rising rate, μ is a coefficient, I is the real-time temperature of the electrical terminal, and R is the working resistance of the electrical terminal.

[0028] The application provides a low-voltage complete switch device and a monitoring system. An isolation mechanism is arranged at the position of an electrical terminal of the low-voltage complete switch device. The mechanical action design of the isolation mechanism realizes the plastic encapsulation protection of the electrical terminal, and simultaneously realizes the detection connection of a controller and the electrical terminal. The connection state of the electrical terminal is detected by a detection mechanism such as a resistance sensor, so that the low-voltage complete switch device can be acquired in real time, and the detection reliability and convenience of the low-voltage complete switch device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0030] Figure 1 is a structural schematic diagram of the low-voltage complete switch device in the embodiment of the application;

[0031] Figure 2 is a structural schematic diagram of the load connection assembly of the low-voltage complete switch device in the embodiment of the application;

[0032] Figure 3 is a structural sectional view of the electrical terminal of the low-voltage complete switch device in the embodiment of the application;

[0033] Figure 4 is a structural sectional view of the connection state of the electrical terminal of the low-voltage complete switch device in the embodiment of the application;

[0034] Figure 5 is a structural schematic diagram of the component of the low-voltage complete switch device in the embodiment of the application;

[0035] Figure 6 is a monitoring system schematic diagram of the low-voltage complete switch device in the embodiment of the application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0037] Embodiment one:

[0038] With reference to Figures 1 to 5 The embodiment of the present application provides a low-voltage switchgear, which comprises a controller 100, a plurality of electrical terminals 21 electrically connected with the controller 100, and a plurality of resistance sensors one-to-one corresponding arranged in the electrical terminals 21. The controller 100 is an electronic module for receiving and processing sensor data and controlling the on-off of the circuit, which can be realized by a microprocessor or a programmable logic controller 100, for real-time analysis of the detection data of the resistance sensor and triggering the action of the isolation mechanism 22, so as to dynamically adjust the circuit state.

[0039] Further, the electrical terminal 21 is an interface component in the low-voltage switchgear 10, which is realized by a copper alloy or silver-plated metal piece material electrical column structure to realize the electrical connection between the low-voltage switchgear 10 and the external electrical equipment.

[0040] Further, the low-voltage switchgear 10 is provided with a load connection assembly 20, the connection end of the external electrical equipment is integrated in the load connection assembly 20, and a plurality of electrical terminals 21 are arranged in the load connection assembly 20. The plug-in connection state between the electrical terminals 21 of the low-voltage switchgear 10 and the external electrical equipment is realized through the plug-in cooperation state of the electrical terminals 21 and the corresponding interfaces in the load connection assembly 20.

[0041] Specifically, the controller 100 and the resistance sensor are connected based on an electrical connection circuit, the electrical terminal 21 is provided with an isolation mechanism 22, and the electrical terminal 21 and the electrical connection circuit are formed in linkage arrangement based on the isolation mechanism 22, so that the connection state of the electrical connection circuit and the electrical terminal 21 of the low-voltage switchgear is linked and moved. When the electrical terminal 21 is in the connection state, the electrical connection circuit is in the on state, and the controller 100 can obtain the resistance data when the electrical terminal 21 is in the working state.

[0042] When the electrical terminal 21 is in a connected state, the isolation mechanism 22 is in an open state, and the electrical connection circuit forms a conduction state based on the open state of the isolation mechanism 22; when the electrical terminal 21 is in a non-connected state, the isolation mechanism 22 is in a closed state, and the electrical connection circuit forms an open circuit state based on the closed state of the isolation mechanism 22. The mechanical action control of the connection state of the electrical terminal 21 is realized by the isolation mechanism 22, which cooperates with the electrical connection circuit, so that the resistance sensor can form a detection state synchronously when the electrical terminal 21 is in a plug-in working state, and the working resistance detection of the electrical terminal 21 in the working state can be realized.

[0043] The dynamic monitoring and automatic adjustment of the connection state of the electrical terminal 21 of the low-voltage complete switchgear 10 are realized. By detecting the change of the contact resistance in real time, the connection abnormality is identified in time. Combined with the physical isolation function of the isolation mechanism 22, the local temperature rise and arc discharge caused by poor contact are effectively prevented. This active monitoring and protection mechanism improves the operation reliability of the equipment, prolongs the service life, and reduces the maintenance cost. At the same time, by accurately positioning the abnormal terminal, timely maintenance is facilitated, the risk of unplanned power outage is reduced, and the stability and continuity of the power supply system are improved.

[0044] Specifically, the isolation mechanism 22 includes a silica gel composite isolation cover 221 and a memory alloy spring 223, and the memory alloy spring 223 is arranged in the silica gel composite isolation cover 221. In this embodiment, the memory alloy spring 223 refers to using memory alloy as the base material of the spring, so that the spring has the spring stretching and contracting deformation effect of mechanical properties to meet the reset operation of the silica gel composite isolation cover 221. At the same time, the memory alloy spring 223 has the self-adaptive deformation characteristic to change the internal structure form with temperature change, so that the spring can reset to the corresponding state.

[0045] The silica gel composite isolation cover 221 is provided with a containing groove, and the electrical terminal 21 is located in the containing groove. The depth of the containing groove can be 1.2-1.5 times the height of the electrical terminal 21 to realize the cladding protection of the electrical terminal 21, so that the silica gel composite isolation cover 221 can perform plastic package protection on the electrical terminal 21, reduce the contact between the electrical terminal 21 and the external environment when the electrical terminal 21 is in an idle state, and thereby reduce the risk of oxidation failure of the electrical terminal 21.

[0046] Further, when the electrical terminal 21 is in an idle state, the electrical terminal 21 is completely accommodated in the isolation mechanism 22, when the electrical terminal 21 is inserted into the corresponding interface position by the operator, the electrical terminal 21 is subjected to an external force, so that the silica gel composite isolation cover 221 can be folded, and the alloy memory spring is compressed under the action of the external force, the interface card of the electrical terminal 21 and the external device is in a matched state, so that the alloy memory spring can be kept in a compressed state, when the electrical terminal 21 is separated from the matched state, the silica gel composite isolation cover 221 can complete the reset operation based on the elastic reset of the memory alloy spring 223.

[0047] Further, the silica gel composite isolation cover 221 is in a cylindrical structure, and a plurality of creases are arranged on the outer side of the silica gel composite isolation cover 221, so that the silica gel composite isolation cover 221 can form a folded state based on the external force of the electrical terminal 21.

[0048] Specifically, the silica gel composite isolation cover 221 is internally provided with a metal connecting rod 222, when the silica gel composite isolation cover 221 is in a folded state, the metal connecting rod 222 is connected with the memory alloy spring 223 in a compressed state, the metal connecting rod 222 and the memory alloy spring 223 are arranged in the electrical connection circuit, and the metal connecting rod 222 and the memory alloy spring 223 are arranged as the interface of the open circuit position of the electrical connection circuit, the metal connecting rod 222 can be arranged as the supporting structure of the silica gel composite isolation cover 221, when the silica gel composite isolation cover 221 is folded based on the external force, the metal connecting rod 222 moves to the direction of the memory alloy spring 223 based on the action of the external force, and the silica gel composite isolation cover 221 forms a folded state outside the metal connecting rod 222.

[0049] The electrical connection circuit forms a conduction circuit based on the connection state of the metal connecting rod 222 and the memory alloy spring 223. When the electrical terminal 21 is connected, the silica gel composite isolation cover 221 is driven into a folded state by an external mechanical force, at this time the memory alloy spring 223 is compressed to a preset stroke. The metal connecting rod 222 is displaced downward with the folding movement of the isolation cover until its end is in full contact with the compressed end surface of the spring. Due to the rigid conduction characteristics of the metal connecting rod 222, the local deformation of the spring end surface is limited within the contact area range, and the contact resistance can be stabilized between 3mΩ and 5mΩ. The electrical connection circuit forms a closed loop through the contact of the metal connecting rod 222 and the spring, avoiding the contact point offset or virtual connection problem caused by the spring deformation in the traditional scheme.

[0050] Specifically, the elastic reset elastic force of the memory alloy spring 223 is N1, and the value of N1 is in the range of 5N≤N1≤7N. The value of the elastic reset elastic force N1 is balanced to isolate the driving force and mechanical stress to achieve the action control of the isolation cover. For example, when N1 is 5N, when the electrical terminal 21 is electrically connected, and the extrusion action of the external force is above 5N, the silica gel composite isolation cover 221 starts to fold, the electrical terminal 21 can be exposed outside the isolation mechanism 22, and can be connected with the interface of the external device, and enters the working state.

[0051] The setting of the elastic reset elastic force can avoid the situation that the electrical terminal 21 is exposed due to accidental touch during daily maintenance, and ensures the plastic packaging protection effect of the silica gel composite isolation cover 221.

[0052] Specifically, the reset temperature of the memory alloy spring 223 is T1, and the value of T1 is in the range of 120℃≤T1≤150℃. When the working temperature of the electrical terminal 21 is higher than the reset temperature, the memory alloy spring 223 can reset and deform, so that the silica gel composite isolation cover 221 is closed to cut off the circuit. That is, the reset elastic force of the memory alloy spring 223 meets the required force for pulling out the electrical terminal 21, and realizes automatic pulling out of the electrical terminal 21.

[0053] Further, the high-temperature reset elastic force of the memory alloy spring 223 is N2, and the value of N2 is in the range of 10N≤N2≤15N, which can meet the pulling out operation requirement of the interface position of the electrical terminal 21 and the external electrical equipment.

[0054] Specifically, during the plugging process of the electrical terminal 21, when the extrusion force exceeds the set lower limit of N1, that is, 5N, the silica gel composite isolation cover 221 is compressed and folded, and the interface position of the electrical terminal 21 and the external electrical equipment is connected to form a conduction working state. The electrical connection circuit can form a conduction state based on the connection of the metal connecting rod 222 and the memory alloy spring 223, so that the controller 100 can form an electrical connection with the resistance sensor to meet the real-time detection of the working resistance of the electrical terminal 21.

[0055] When the temperature of the electrical terminal 21 rises to T1 due to abnormal load, in this embodiment, T1 is set to 120℃, the memory alloy spring 223 is triggered to reset and deform by heat, drives the isolation cover to unfold and close, and the electrical terminal 21 is disconnected from the interface position of the external electrical equipment, thereby forming an open circuit.

[0056] Specifically, the controller 100 is configured to acquire detection data of the resistance sensor and generate a dynamic curve of the contact resistance of the electrical terminal 21 according to the detection data. The detection data of the resistance sensor is acquired through periodic sampling, and the sampling frequency can be set to 10 Hz to 100 Hz, for example, the resistance value is collected at a frequency of 50 Hz. After the detection data is processed by an analog-to-digital conversion module, it is transmitted to the controller 100. The controller 100 has a built-in data processing algorithm that interpolates and fits the discrete resistance values in time sequence to generate a continuous curve.

[0057] Further, the horizontal axis of the resistance dynamic curve is the time axis, and the time resolution can be set to 0.1 seconds to 1 second. The vertical axis is the resistance value, and the range covers 0Ω to 100mΩ. During the generation of the resistance dynamic curve, a sliding window algorithm is used to filter abnormal data, and the window length can be set to 5 to 10 sampling points, so that the resistance detection value of the resistance dynamic curve can be recorded directly. When the electrical terminal 21 is in a connected state, the isolation mechanism 22 is opened to make the electrical connection circuit conductive, and the resistance sensor measures the contact interface resistance value in real time. The controller 100 receives the resistance data through the electrical connection circuit and stores the data points in the cache area based on a preset time interval. The data processing algorithm calls the cubic spline interpolation method to convert the discrete data into a smooth curve, and calculates the resistance change rate of adjacent time points. When the curve shows that the resistance value fluctuates more than a set threshold within 1 second, for example, the fluctuation amplitude exceeds 20% of the reference value, the controller 100 triggers a warning signal. The dynamic curve data is associated with the opening and closing state of the isolation mechanism 22. The resistance change is continuously recorded during the conduction of the circuit, and the data acquisition is automatically paused when the circuit is disconnected.

[0058] Further, by setting a threshold value, the working resistance of the electrical terminal 21 is detected and analyzed to determine whether the working resistance of the electrical terminal 21 can meet the normal working requirements of the electrical terminal 21, and whether the working resistance is within the resistance value range of the running state under the normal working load of the electrical terminal 21, thereby avoiding the problem of incorrect operation of the electrical terminal 21.

[0059] Specifically, the low-voltage switchgear 10 further comprises a displacement sensor and a temperature sensor arranged in the isolation mechanism 22. The controller 100 constructs a three-level diagnostic model based on the detection data of the displacement sensor, temperature sensor and resistance sensor, that is, the working resistance, displacement data and temperature data of the electrical terminal 21 are detected in sequence, and the working state of the electrical terminal 21 is detected in multiple dimensions, which can improve the detection reliability and stability of the detection state of the electrical terminal 21.

[0060] The displacement sensor can be installed on the folding area of the silica gel composite isolation cover 221 or the deformation path of the memory alloy spring 223, for capturing the displacement amount when the isolation mechanism 22 acts, and the detection range of the displacement amount can be 0.1-1 mm. The displacement detection can be realized by using a Hall sensor, which can improve the reliability of displacement data detection between related elements in the isolation mechanism 22.

[0061] The temperature sensor can be arranged at the contact point of the electrical terminal 21 or the surface of the memory alloy spring 223, and the temperature detection range can be 100-200°C. The controller 100 inputs the displacement signal output by the displacement sensor, the temperature signal output by the temperature sensor, and the resistance signal output by the resistance sensor into the preset three-level diagnosis model for sequential analysis. The working state of the electrical terminal 21 is processed by hierarchical detection to ensure progressive detection of the connection state, working resistance, and working temperature of the electrical terminal 21. The output results of each module are combined to generate a comprehensive diagnosis conclusion by a weighting algorithm or logical operation.

[0062] Further, when the displacement data exceeds the preset threshold, the mechanical state judgment module triggers an alarm signal, and the thermal stability evaluation module judges whether the temperature rise of the contact point is caused by abnormal displacement based on the temperature data, to improve the accuracy of the controller 100 in detecting the working state of the electrical terminal 21.

[0063] Specifically, according to the three-level diagnosis model, the working resistance, displacement data, and temperature data of the electrical terminal 21 are comprehensively analyzed to perform real-time risk assessment on the working state of the electrical terminal 21, and corresponding management adjustment measures are taken according to the risk assessment data of the electrical terminal 21.

[0064] Further, when the risk index of the risk assessment data is 0.5-1.0, the controller 100 can perform a pre-warning operation on the electrical terminal 21, so that the operating personnel can detect and maintain the electrical terminal 21; when the risk index of the risk assessment data is 1.0-2.0, the controller 100 can start a protection delay for the electrical terminal 21, and simultaneously broadcast a prompt such as "please confirm the switch interlocking state" through voice, so that the operating personnel can check and handle the connection state of the corresponding electrical terminal 21 in time; when the risk index of the risk assessment data is >2.0, the electrical terminal 21 is forcibly disconnected by triggering a relay, and the electrical terminal 21 is physically isolated based on the isolation mechanism 22, so that the operating personnel can perform maintenance and detection.

[0065] The embodiment of the present application provides a low-voltage switchgear 10, which is characterized in that an isolation mechanism 22 is arranged at the position of an electrical terminal 21 of the low-voltage switchgear 10, the mechanical action of the isolation mechanism 22 is designed to realize the plastic encapsulation protection of the electrical terminal 21, and meanwhile realizes the detection connection of a controller 100 and the electrical terminal 21, and the connection state of the electrical terminal 21 is detected by cooperating with a resistance sensor and other detection mechanisms, so that the low-voltage switchgear 10 can be acquired in real time, and the detection reliability and convenience of the low-voltage switchgear 10 are improved.

[0066] Embodiment two:

[0067] Please refer to Figure 6 The embodiment of the present application provides a monitoring system of a low-voltage switchgear 10, and the monitoring system comprises:

[0068] The detection assembly 200 is used for detecting the connection state data of a plurality of electronic terminals of the low-voltage switchgear, and is provided with a resistance detection unit 201, a displacement detection unit 203 and a temperature detection unit 202; the resistance detection unit 201 detects the working resistance of the connection state of the electrical terminal 21 by using a resistance sensor, and when the electrical terminal 21 is electrically connected with an external electrical equipment, the resistance sensor can be triggered to detect the working resistance of the electrical terminal 21 in real time, so that the controller 100 analyzes whether the working resistance of the electrical terminal 21 meets the normal operation requirement.

[0069] The displacement detection unit 203 is used for detecting the relative displacement state of the isolation mechanism 22 of the electrical terminal 21, and the isolation mechanism 22 of the electrical terminal 21 realizes the locking of the connection state of the electrical terminal 21 based on a mechanical connection structure; the displacement data of the component state of the isolation mechanism 22 is detected by using a displacement sensor, so that the connection state of the electrical terminal 21 is detected in real time.

[0070] The controller 100 is used for constructing a three-level diagnosis model according to the connection state data, and adjusting the connection state of the low-voltage switchgear according to the detection result of the three-level diagnosis model; the resistance, displacement and temperature data of the electrical terminal 21 are detected in sequence by using the three-level diagnosis model, so that the connection state of the electrical terminal 21 is detected in stages, and the accuracy of the working state detection of the electrical terminal 21 can be improved.

[0071] Specifically, the three-level diagnosis model comprises the displacement detection unit 203, the resistance detection unit 201 and the temperature detection unit 202.

[0072] The displacement detection threshold of the displacement detection unit 203 is D, the value range of D is: 0.3mm≤D≤0.5mm, the displacement detection threshold is the detection threshold of the displacement deviation of the isolation mechanism 22, if the displacement deviation is greater than the displacement detection threshold, it is judged that the electrical terminal 21 is in a virtual connection state, and the staff is prompted by setting an alarm to detect and maintain the electrical terminal 21, so as to ensure that the electrical terminal 21 can be in a correct connection state, thereby meeting the working load demand of the low-voltage complete switch device 10.

[0073] The resistance detection threshold of the resistance detection unit 201 is R, the value range of R is: 3mΩ≤R≤5mΩ, when the resistance detection unit 201 detects the working resistance of the electrical terminal 21 as R, the working connection state of the electrical terminal 21 is in a deteriorated connection state, and the working connection state of the electrical terminal 21 cannot meet the working steady connection demand, so the electrical terminal 21 needs to be maintained.

[0074] Further, the resistance detection unit 201 is also provided with a resistance upper limit detection threshold, when the resistance value obtained by the resistance detection unit 201 detecting the electrical terminal 21 is greater than the resistance upper limit detection threshold, the electrical connection terminal is in a failure connection state, that is, the connection state of the electrical terminal 21 cannot meet the working load demand of the low-voltage complete switch device 10, the controller 100 adjusts the working load by starting the standby line in time, and generates alarm information to notify the operator to maintain and update in real time, so as to improve the accuracy of the maintenance of the electrical terminal 21.

[0075] Specifically, the temperature detection unit 202 is used to detect the temperature rise rate of the electrical terminal 21 according to the temperature data of the electrical terminal 21 and the differential equation, and adjust the working load of the electrical terminal 21 according to the temperature rise rate, the temperature detection unit 202 detects the real-time working temperature of the electrical terminal 21 based on the temperature sensor, and combines the real-time working resistance of the electrical terminal 21 to calculate the temperature rise rate of the electrical terminal 21, so as to obtain the temperature rise data of the electrical terminal 21, so as to measure the working state of the electrical terminal 21.

[0076] Specifically, the differential equation is:

[0077] ;

[0078] Wherein, is the temperature rise rate, μ is the coefficient, I is the real-time temperature of the electrical terminal 21, and R is the working resistance of the electrical terminal 21.

[0079] Specifically, the real-time temperature I in the differential equation is detected by a temperature sensor, the working resistance R is detected by a resistance sensor, the coefficient μ is calibrated and set according to the material of the electrical terminal 21 and the working environment parameters, and can be set according to the experience of the staff, which is not limited here. The calculation process of the temperature rise rate can be configured to be dynamically updated, for example, the differential equation operation is performed once every 0.5 seconds, so that the temperature detection unit 202 can continuously track the thermal state change of the electrical terminal 21. When the temperature rise rate is greater than 1℃ / s, the controller 100 performs a load reduction operation on the electrical terminal 21, and specifically, a backup line can be enabled to shunt, so as to reduce the working current of the corresponding electrical terminal 21, thereby reducing the working load of the electrical terminal 21, while meeting the normal operation demand of the load end of the low-voltage complete switchgear 10.

[0080] Specifically, the temperature detection unit 202 quantifies the product relationship between the real-time temperature I and the working resistance R as the temperature rise rate dT / dt through the differential equation, and the temperature square term amplifies the growth trend of the temperature rise rate in the high-temperature state. When the temperature rise rate exceeds the preset threshold, the working load of the electrical terminal 21 is automatically reduced to realize the electrical protection of the electrical terminal 21. In this process, the real-time measurement value of the working resistance R is updated to the differential equation in synchronization, so as to ensure that the internal loss change is timely reflected in the calculation result of the temperature rise rate. By combining the theoretical model with the real-time detection data, the temperature rise trend of the electrical terminal 21 is accurately predicted, and the response time of the load adjustment is shortened to within 1 second, avoiding the overload risk caused by the lag of temperature data in the traditional scheme. Therefore, the working state stability of the electrical terminal 21 is improved, and the equipment damage probability is effectively reduced.

[0081] The embodiment of the present application provides a monitoring system of a low-voltage complete switchgear 10, which detects the electrical terminal 21 of the low-voltage complete switchgear 10 in stages through the resistance detection unit 201, the displacement detection unit 203 and the temperature detection unit 202, can accurately obtain the working state of the electrical terminal 21 of the low-voltage complete switchgear 10, sets the isolation mechanism 22 at the position of the electrical terminal 21 of the low-voltage complete switchgear 10, realizes the plastic encapsulation protection of the electrical terminal 21 through the mechanical action design of the isolation mechanism 22, and simultaneously realizes the detection connection of the controller 100 and the electrical terminal 21, cooperates with the detection mechanism such as the resistance sensor to detect the connection state of the electrical terminal 21, can realize the real-time acquisition of the low-voltage complete switchgear 10, and improves the detection reliability and convenience of the low-voltage complete switchgear 10.

[0082] In addition, the low-voltage complete switch device and the monitoring system provided by the embodiment of the application are described in detail, and the principle and implementation manner of the application are described by using specific examples in this paper. The above description of the embodiments is only used to help understand the method of the application and the core idea thereof. Meanwhile, for those skilled in the art, the specific implementation manner and the application range can be changed according to the idea of the application. In summary, the content of the specification should not be understood as a limitation of the application.

Claims

1. Low voltage switchgear assembly, characterized in that The low-voltage complete switch device comprises a controller, a plurality of electrical terminals electrically connected with the controller, and a plurality of resistance sensors one-to-one corresponding arranged in the electrical terminals; The controller and the resistance sensors are connected based on an electrical connection circuit, the electrical terminals are provided with an isolation mechanism, and the electrical terminals and the electrical connection circuit form a linkage arrangement based on the isolation mechanism; When the electrical terminals are in a connected state, the isolation mechanism is in an open state, and the electrical connection circuit forms a conduction state based on the open state of the isolation mechanism; When the electrical terminals are in a non-connected state, the isolation mechanism is in a closed state, and the electrical connection circuit forms an open circuit state based on the closed state of the isolation mechanism; The isolation mechanism comprises a silica gel composite isolation cover and a memory alloy spring, and the memory alloy spring is arranged in the silica gel composite isolation cover; The silica gel composite isolation cover is provided with a containing groove, and the electrical terminals are located in the containing groove; A metal connecting rod is arranged inside the silica gel composite isolation cover, and when the silica gel composite isolation cover is in a folded state, the metal connecting rod is connected with the memory alloy spring in a compressed state; The electrical connection circuit forms a conduction circuit based on the connection state of the metal connecting rod and the memory alloy spring.

2. Low voltage switchgear assembly according to claim 1, characterized in that The elastic reset elastic force of the memory alloy spring is N1, and the value range of N1 is 5N≤N1≤7N; The reset temperature of the memory alloy spring is T1, and the value range of T1 is 120℃≤T1≤150℃; The high-temperature reset elastic force of the memory alloy spring is N2, and the value range of N2 is 10N≤N2≤15N.

3. Low voltage switchgear assembly according to claim 1, characterized in that The controller is used for acquiring detection data of the resistance sensors and generating a contact resistance dynamic curve of the corresponding electrical terminals according to the detection data.

4. Low voltage switchgear assembly according to claim 1, characterized in that The low-voltage complete switch device further comprises a displacement sensor and a temperature sensor arranged in the isolation mechanism; The controller constructs a three-level diagnosis model based on the detection data of the displacement sensor, the temperature sensor and the resistance sensor.

5. A monitoring system of a low voltage switchgear assembly, characterized by The monitoring system is used for detecting the low-voltage complete switch device according to any one of claims 1 to 4, and the monitoring system comprises: A detection assembly for detecting connection state data of a plurality of electronic terminals of a low-voltage complete switch; A controller for constructing a three-level diagnosis model according to the connection state data and adjusting the connection state of the low-voltage complete switch according to the detection result of the three-level diagnosis model.

6. The monitoring system of low voltage switchgear according to claim 5, characterized in that, The three-level diagnosis model comprises a displacement detection unit, a resistance detection unit and a temperature detection unit; The displacement detection threshold of the displacement detection unit is D, and the value range of D is 0.3mm≤D≤0.5mm; The resistance detection threshold of the resistance detection unit is R, and the value range of R is 3mΩ≤R≤5mΩ.

7. The monitoring system of low voltage switchgear according to claim 6, characterized in that, The temperature detection unit is used for detecting the temperature rise rate of the electrical terminals according to the temperature data of the electrical terminals combined with a differential equation, and adjusting the working load of the electrical terminals according to the temperature rise rate.

8. The monitoring system of low voltage switchgear according to claim 7, characterized in that, The differential equation is: ； wherein is the temperature rise rate, μ is a coefficient, I is the real-time temperature of the electrical terminal, and R is the operating resistance of the electrical terminal.

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