CN215934157U - Line detection system of power distribution switch - Google Patents
Line detection system of power distribution switch Download PDFInfo
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- CN215934157U CN215934157U CN202121951850.1U CN202121951850U CN215934157U CN 215934157 U CN215934157 U CN 215934157U CN 202121951850 U CN202121951850 U CN 202121951850U CN 215934157 U CN215934157 U CN 215934157U
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Abstract
The application discloses distribution switch's line detection system includes: the switch assembly is arranged in the upper mounting cavity and is suitable for the cabinet body and a plurality of loads are respectively connected with the power output device in parallel; the detection module is connected with the switch assembly and is suitable for detecting electric signals of the input end and the output end of the switch assembly; the control module is installed in the cabinet body, is electrically connected with the detection module, and is suitable for controlling the switch assembly to open or close according to the electric signal change of the detection module. The beneficial effect of this application: the quantity of the switch assemblies in the access circuit can be adjusted according to the change condition of current in the circuit, so that the safety of the load in the whole circuit is protected, and meanwhile, when the load or the switch assemblies break down, the load with the fault can be disconnected while the normal work of the circuit is ensured, and the safety of the whole circuit is further improved.
Description
Technical Field
The application relates to the field of power equipment, in particular to a direct-current power distribution switch.
Background
With the rapid development of distributed photovoltaic, more distributed photovoltaic is connected to an urban power grid in the future, under the condition of the existing alternating current power distribution network, photovoltaic of direct current power generation needs to be connected through two-stage conversion of DC/DC and DC/AC, a large number of converters are inevitably introduced into the alternating current power distribution network, waste is caused, efficiency is reduced, and random fluctuation of the photovoltaic also has direct influence on the power grid. Therefore, how to connect the distributed photovoltaic into the power grid more effectively, conveniently and reliably becomes a difficult problem which needs to be solved urgently. The direct-current power distribution network can realize flexible access of distributed photovoltaic, the inversion process of DC/AC is omitted, the links of electric energy conversion are reduced, the energy utilization efficiency is improved, the investment cost is saved, and the problems are effectively solved. Meanwhile, the development of power electronic technology makes the direct current load have rapid development, for example, household appliances such as air conditioners, refrigerators and washing machines adopt power electronic frequency conversion technology, LED lighting, electric vehicle charging piles, mobile phones and the like need direct current driving, and the direct current driving needs to be carried out through the conversion of AC/DC or even AC/DC/AC in the traditional alternating current power network. The establishment of the direct-current distribution network can directly supply power to equipment without conversion, so that the development of direct-current load distributed power generation and energy storage also plays a great role in promoting the development of the direct-current distribution network.
However, in the current photovoltaic power generation, the solar radiation is related to weather conditions such as four seasons, day and night, cloudy and sunny conditions, so that the generated energy is unstable, and the following problems are easily caused in the photovoltaic direct current power distribution process:
(1) since the rated current of the single electric storage device or other load is a constant value, the single electric storage device or other load may be overloaded when the amount of electric power generation is excessively large.
(2) Because of the instability of the generated energy, the output current of the power generation device is also unstable, and the requirements on the stability and the safety of the direct current distribution switch are higher.
(3) Because the intelligent degree of current direct current distribution network is not high, can't in time prevent trouble or accident.
In order to solve the problems, the application provides an intelligent direct-current power distribution switch and a working method thereof.
Disclosure of Invention
One of them aim at of this application provides an intelligent direct current distribution switch, through intelligent control switching device's the opening and close to the realization protects the circuit.
One of the objectives of the present application is to provide a detection system for a power distribution switch, so as to realize intelligent control of the power distribution switch.
One of the objects of the present application is to provide a switching device capable of quickly breaking a circuit.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: an intelligent direct-current power distribution switch comprises a cabinet body, a switch device, a driving device and a monitoring system, wherein the cabinet body comprises an upper mounting cavity and a lower mounting cavity, the switch device is fixedly mounted in the upper mounting cavity through a mounting frame, the switch device comprises a driving shaft, a pair of connecting plate assemblies and a plurality of switch assemblies, the output ends and the input ends of the switch assemblies are respectively connected with the two connecting plate assemblies, so that the switch assemblies are mutually independent and connected in a circuit, and the driving shaft is matched with the switch assemblies; the driving device is fixedly connected with the mounting frame and is suitable for driving the driving shaft to rotate and/or axially move; the monitoring system is arranged in the lower mounting cavity and comprises a detection module and a control module, the detection module is electrically connected with the control module, the control module is electrically connected with the driving device, the detection module is suitable for detecting electric signals of the two connecting plate assemblies, so that the control module controls the starting of the driving device according to the detected electric signal changes, and further drives the driving shaft to control the opening or closing of the switch assemblies, it can be understood that the electric signals in the input end circuit of the switch assemblies can be detected through the detection module, the number of the switch assemblies in the access circuit is controlled according to the current in the circuit, and therefore the number of loads in the access circuit is adjusted, the protection of the loads is realized, and meanwhile, the fault of the loads can be judged according to the potential abnormity of the two ends of the switch assemblies, and the switch assembly connected with the fault load is disconnected, so that the safety of the whole circuit is further improved.
Preferably, the switch component comprises a supporting cover, a flashboard component and a pair of fixed contact rods, the supporting cover is fixedly connected with the inner wall of the mounting rack through a fixing seat, an inner cavity is arranged in the supporting cover, symmetrical positioning seats are arranged in the middle of the supporting cover along the radial direction, a through groove penetrating through the inner cavity is arranged on the side wall of the supporting cover, the plane of the through groove is perpendicular to the axis of the positioning seat, the flashboard component is arranged in the inner cavity and is in running fit with the positioning seat, the two fixed contact rods are respectively in sliding fit with the positioning sliding grooves at the two ends of the supporting cover, so that one end of each of the two fixed contact rods extends into the inner cavity, meanwhile, the other ends of the two fixed contact rods are respectively connected with the two connecting plate components, and the driving shaft penetrates through the positioning seat and is matched with the flashboard component, so that the driving shaft can axially move or rotate, the flashboard assembly is driven to be connected or disconnected with the two fixed contact rods, so that the switching-off or switching-on of the whole switch assembly is realized.
Preferably, the plurality of gate plate assemblies are in sliding sleeve connection with the driving shaft, the inner wall of each gate plate assembly is provided with a driving block, the side wall of the driving shaft is axially provided with a plurality of sections of communicated slide rail grooves, an axial projection included angle between every two adjacent slide rail grooves and the driving shaft is 45-90 degrees, meanwhile, the side wall of the driving shaft is also provided with a plurality of avoidance grooves at intervals along the circumferential direction, and the avoidance grooves are communicated with the slide rail grooves; the driving block is suitable for being correspondingly matched with the sliding rail groove and the avoidance groove;
when the driving shaft only moves axially, the driving block slides along the slide rail groove to drive each brake plate component to rotate in sequence to be connected or disconnected with the fixed contact rods at two ends; when the load in the circuit breaks down, the driving shaft moves axially and rotates, so that the driving blocks are correspondingly matched with the sliding rail groove and the avoidance groove respectively, the switch component connected with the fault load is driven to be switched off, and the safety of the whole circuit is guaranteed.
Preferably, the slide rail grooves comprise straight slide grooves and inclined slide grooves, the radian of the axial projection of each inclined slide groove on the driving shaft is pi/4-pi/2 rad, the adjacent slide rail grooves are communicated through the straight slide grooves and the inclined slide grooves, the axial length of each inclined slide groove is delta L, the number of the switch assemblies is n, the axial length of each straight slide groove is (n-1) delta L, and meanwhile, the spacing distance between the adjacent driving blocks is (n +1) delta L; therefore, when the driving shaft only moves axially, the flashboard assemblies can be driven to be sequentially connected or disconnected with the fixed contact rod through the gradual movement of the length delta L.
Preferably, the gate plate assembly comprises a support sleeve and a drive sleeve, the drive sleeve is fixedly mounted on the inner wall of the support sleeve, the drive sleeve is in rotating fit with the positioning seat, the drive block is arranged on the inner wall of the drive sleeve, two symmetrical pairs of movable gate plates are arranged on the outer side wall of the support sleeve, and a contact is arranged at the end part of the fixed contact rod, which is positioned in the inner cavity; when the flashboard assembly and the fixed contact rod are switched on, the two pairs of movable flashboards are respectively in press fit with the contacts at two ends; when the flashboard assembly and the fixed feeler lever are switched off, the two pairs of movable flashboards are respectively separated from the contacts at the two ends.
Preferably, the end face, opposite to the end face, of the positioning seat in the inner cavity is provided with a raceway groove, and the two ends of the driving sleeve are also provided with raceway grooves, so that when the driving sleeve is matched with the positioning seat, the driving sleeve is matched with the raceway grooves on the positioning seat to form a raceway, and a plurality of rolling bodies are installed in the raceway, so that the driving sleeve is matched with the positioning seat in a rolling manner, and abrasion between the driving sleeve and the positioning seat is reduced.
Preferably, the outer side wall of the movable flashboard is fixedly provided with a traction plate, the traction plate is provided with a traction groove, guide pins are fixedly arranged on two sides of the contact, the guide pins are suitable for being matched with the traction groove, so that when the movable flashboard is separated from the contact, the fixed contact rod is driven to axially move towards the direction far away from the contact through the sliding of the traction groove by the guide pins, and further the speed of the movable flashboard separated from the contact is increased, so that the opening effect of the switch assembly is improved.
Preferably, the traction groove comprises a traction chute and a traction arc groove, the traction chute is communicated with the traction arc groove through the tail end, and the traction arc groove is concentric with the support sleeve; when move the flashboard with when the contact breaks away from each other, the uide pin is through following it slides extremely to draw the chute, can drive decide the feeler lever and carry out axial displacement after keep motionless, thereby avoid deciding the feeler lever and take place the mistake and touch.
Preferably, the driving device comprises a rotary driving device and a telescopic driving device, the rotary driving device is fixedly mounted on one side of the mounting frame, an output end of the rotary driving device extends into the mounting frame and is connected with a spline shaft, a spline groove is formed in one end of the driving shaft, and the rotary driving device is matched with the spline shaft and the spline groove to drive the driving shaft to rotate; flexible drive arrangement fixed mounting in the opposite side of mounting bracket, flexible drive arrangement's output stretches into in the mounting bracket and be connected with the telescopic link, simultaneously the other end of drive shaft is provided with the spread groove, flexible drive arrangement passes through the telescopic link with the cooperation of spread groove can drive the drive shaft carries out axial displacement.
Preferably, the connecting plate assembly at the input end of the switch assembly comprises a connecting cable and a plurality of connecting plates, the connecting plates are connected in series through the connecting cable, and one connecting plate is connected with a connecting seat, so that the connecting plate assembly at the input end of the switch assembly can simultaneously connect the input ends of the switch assemblies with a circuit through the connecting seat, and meanwhile, the other connecting plates are also connected with sliding seats;
the connecting plate assembly positioned at the output end of the switch assembly comprises a plurality of connecting plates, one end of each connecting plate is correspondingly connected with the output end of one of the switch assemblies, and the other end of each connecting plate is connected with a load in a circuit, so that each switch assembly correspondingly controls the load in the circuit.
Preferably, the upper part of the rear side wall of the mounting rack is provided with a plurality of upper chutes, so that the connecting plate assembly positioned at the input end of the switch assembly is sequentially in sliding fit with the upper chutes through the connecting seat and the sliding seat; simultaneously the lower part of mounting bracket is provided with the baffle, and be provided with a plurality of lower spouts on the baffle, so that be located the switch module output link the board subassembly pass through the connecting seat in proper order with spout sliding fit down, thereby guarantee when the switch module carries out the separating brake, both ends decide the feeler lever and can smoothly carry out axial displacement.
A method of operating a power distribution switch, comprising the monitoring system and the switchgear, the monitoring system comprising the detection module and the control module, the detection module being configured to detect an electrical signal of the switchgear and being electrically connected to the control module, while the control module is electrically connected to the driving device, the monitoring method comprising the steps of:
s100: firstly, switching on a switch assembly close to the side part to enable a load connected with the switch assembly to be conducted with a circuit, and at the moment, the detection module detects that the total current at the input end of the circuit is I and transmits a current signal to the control module;
s200: the control module is used for converting the total current I and the rated current I of the load according to the current signal0Carrying out comparison; when I < I0When the control module does not respond to the driving device; when (n-1) I0＜I＜nI0When the control module controls the telescopic driving device to move by (n-1) delta L length, so that (n-1) switch assemblies are switched on in sequence; when I > nI0When the control module is used, the control module controls the driving device to respond so as to enable all the switch assemblies to be switched off; wherein n represents the total number of switch assemblies, and n > 1;
when I < nI0And then, the following steps are continued:
s300: the detection module carries out potential detection on the input end and the output end of the switch-on switch assembly in S200, and the detected potential of the input end is
Detected output terminal potential of
And transmitting the detected voltage signal to the control module;
s400: the control module can obtain the partial pressure of each switch component according to the input voltage signal
Further obtaining the actual resistance value of each switch component
S500: the control module is used for comparing the actual resistance value R of each switch componentNWith its rated resistance value RN0By comparison, if R appearsNGreater than kRN0And k is a correction coefficient and represents that the load connected with the switch assembly or the switch assembly per se has a fault, and the control module controls the telescopic driving device and the rotary driving device to cooperatively respond to the fault loadThe switch component is opened, so that the safety of the whole circuit is protected.
Preferably, S400 further comprises the steps of:
s410: the control module divides the voltage of each switch component every unit time delta T
Recording to obtain two instantaneous partial voltages of each switch assembly at a distance of delta T
And
s420: the control module divides the voltage according to the instant voltage in S410
And
the voltage division increment of each switch component in each delta T time can be obtained
S430: the control module increases Q according to the continuous voltage divisiontCan be found as an approximation function f (q) for the partial pressure increase;
s440: the control module can calculate the voltage division value of each switch component at the next delta T time according to the obtained approximate function f (Q)
And the partial pressure value
The load is carried into the step S400 for calculation, and the step S500 is carried out according to the calculated value, so that the load can be switched off before reaching the complete fault, and the whole circuit is improvedAnd (4) safety.
Preferably, the value of the correction coefficient k is 1.1-1.5, and the unit time Δ T is 10-30 min.
Preferably, the monitoring system further comprises a communication module, wherein the communication module is electrically connected with the control module, so that when the switch assembly breaks down, the communication module sends a fault signal to a monitoring center to give an alarm.
Compared with the prior art, the beneficial effect of this application lies in:
(1) whole direct current distribution switch can be according to the change condition of electric current in the circuit to the quantity of switch module in the adjustment access circuit through drive arrangement's start-up, thereby the security of load in the whole circuit of protection, when the load breaks down simultaneously, through drive arrangement's cooperative response, can break off the load of trouble when guaranteeing that the circuit normally works, the security of further improvement whole circuit.
(2) When the switch module breaks off, carry out sliding fit through the guide pin on the traction groove on the movable flashboard and the contact of deciding the feeler lever to make the movable flashboard rotate the separating brake and simultaneously drive and decide the feeler lever and carry out axial displacement, thereby can accelerate the separating speed between movable flashboard and the fixed feeler lever when the separating brake, in order to realize the quick circuit break of switch module.
(3) Whole distribution switch detects the signal of telecommunication of access switch subassembly through monitoring system, and monitoring system can judge the required quantity of switch subassembly in the access circuit according to the signal of telecommunication that detects, can also come the fault situation of prejudgement load according to the signal of telecommunication of switch subassembly simultaneously to break off the load that is about to the trouble according to the result of prejudgement, thereby realize the intelligent real-time supervision to whole direct current distribution switch.
(4) According to the technical scheme, the intelligent degree of the photovoltaic direct-current power distribution network can be improved, reasonable distribution of electric quantity is achieved, meanwhile, when a load or an electric storage device breaks down due to power fluctuation or self aging, the fault part can be timely broken and the fault can be prevented in advance, and therefore safety and reliability of the power distribution network are guaranteed. In addition, the technical scheme of this application can also be applied to other distribution fields that can use the direct current distribution network such as wind power generation, energy storage station, new energy automobile charging station to realize the same effect.
Drawings
FIG. 1 is a schematic front view of the present invention
FIG. 2 is a schematic front view of the switch assembly of the present invention mounted in a mounting bracket;
FIG. 3 is a schematic view of the internal structure of the mounting bracket of the present invention;
FIG. 4 is a schematic structural diagram of the switching device of the present invention;
FIG. 5 is a schematic view of a portion of the drive shaft of the present invention;
FIG. 6 is a schematic view of another embodiment of the drive shaft of the present invention;
FIG. 7 is a schematic view showing an internal structure of a drive shaft according to the present invention;
FIG. 8 is an exploded view of the switch assembly of the present invention;
FIG. 9 is a schematic view showing the internal structure of the support cover according to the present invention;
FIG. 10 is a schematic structural view of a stationary trolley according to the present invention;
FIG. 11 is a schematic view of the shutter assembly of the present invention;
FIG. 12 is a partial cross-sectional view of the ram assembly of the present invention;
FIG. 13 is a schematic view of the overall internal structure of the present invention;
fig. 14 is a schematic structural diagram of the switching assembly in a closing state according to the present invention;
FIG. 15 is a schematic view of the operating state of the switch device of the present invention;
FIG. 16 is a schematic view of the drive shaft driving a plurality of switch assemblies of the present invention in operation;
FIG. 17 is a schematic view of the drive shaft driving the fail switch assembly to open the brake in accordance with the present invention;
FIG. 18 is a flow chart of the operation of the monitoring system of the present invention;
in the figure: the cabinet body 1, the upper mounting cavity 110, the lower mounting cavity 120, the rotary driving device 2, the spline shaft 201, the telescopic driving device 3, the telescopic rod 301, the mounting frame 4, the upper chute 410, the partition plate 41, the lower chute 420, the switching device 5, the driving shaft 51, the slide rail groove 510, the straight chute 5101, the inclined chute 5102, the first avoidance groove 5103, the second avoidance groove 5104, the third avoidance groove 5105, the fourth avoidance groove 5106, the fifth avoidance groove 5107, the sixth avoidance groove 5108, the spline groove 5109, the connecting groove 5110, the switch assembly 52, the support cover 521, the inner cavity 5210, the through groove 5211, the positioning chute 5212, the positioning seat 5213, the rolling groove 5214, the fixed contact rod 522, the connecting end 5221, the contact 5222, the guide pin 5223, the shutter assembly 523, the support sleeve 5231, the movable shutter 5232, the driving sleeve 5233, the driving block 5234, the traction plate 5235, the traction chute 5236, the traction arc groove 5237, the traction arc groove 53, the connecting plate 530, the connecting cable 531, the connecting plate 531, the sliding seat 5104, the sliding cable 5, the sliding groove 5104, the sliding groove 5210, the internal cavity 5211, the internal cavity 5210, the driving block and the internal cavity 5211, The connecting base 533, the fixing base 6, the rolling body 7, the monitoring system 8, the detecting module 81, the control module 82, and the communication module 83.
Detailed Description
The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In a preferred embodiment of the present application, as shown in fig. 1 to 18, an intelligent dc power distribution switch includes a cabinet 1, a switching device 5, a driving device, and a monitoring system 8; wherein the cabinet body 1 comprises an upper mounting cavity 110 and a lower mounting cavity 120 inside, two switch devices 5 are provided, and are respectively arranged in the upper mounting cavity 110 of the cabinet body 1 through the mounting rack 4, the two switch devices 5 have the same structure and function, and respectively communicating with the positive circuit and the negative circuit, each switching device 5 specifically comprises a driving shaft 51, a pair of connecting plate assemblies 53 and a plurality of switching assemblies 52, the two connecting plate assemblies 53 respectively communicating with the input end and the output end of the circuit, while the two link plate assemblies 53 respectively connect the input terminals and the output terminals of the plurality of switch assemblies 52, so that a plurality of switch assemblies 52 are connected to the circuit independently, the specific number of switch assemblies 52 can be adjusted according to actual needs, for example, as shown in fig. 2, 4 and 15, the number of the switch assemblies 52 is three, and three switch assemblies 52 are vertically installed at regular intervals inside the mounting bracket 4. It can be understood that the circuit in the present application is composed of a power output device, a load and a dc distribution switch, wherein the positive circuit is composed of a positive output interface of the power output device, one of the switch devices 5 and a positive input interface of the load, wherein the negative circuit is composed of a negative output interface of the load, the other switch device 5 and a negative input interface of the power output device; the two switch devices 5 are respectively connected in series in the positive pole circuit and the negative pole circuit, and the open circuit or open circuit of the corresponding switch assembly 52 in the two switch devices 5 is one-to-one, so in the following embodiments, only one of the switch devices 5 needs to be explained. While the power output device may be a power generation device or other device having a similar function, the load may be an electrical storage device or other device having a similar function.
Wherein, the driving shaft 51 is transversely installed in the mounting frame 4 and is respectively matched with the three switch components 52; meanwhile, the driving device is fixedly connected with the mounting frame 4, and the output end of the driving device is connected with the end part of the driving shaft 51, so that the driving device can drive the driving shaft 51 to rotate or move axially.
Wherein, monitoring system 8 installs in the lower installation cavity 120 of the cabinet body 1, monitoring system 8 specifically includes detection module 81 and control module 82, detection module 81 is used for detecting the signal of telecommunication on two even board subassemblies 53, and detection module 81 is connected with control module 82 electricity, so that detection module 81 carries the signal of telecommunication that detects to control module 82, control module 82 still carries out the electricity with drive arrangement simultaneously and is connected, so that control module 82 controls drive arrangement's start-up according to the signal of telecommunication value of carrying, and then can drive three switch module 52 of drive shaft 51 control and carry out separating brake or combined brake. It can be understood that the total current at the input end of the switching device 5 can be detected by the detection module 81, and then the number of the switching elements 52 connected to the circuit can be controlled according to the detected current, so as to protect the safety of the load connected to the circuit, and meanwhile, whether the load connected to the switching element 52 or the switching element 52 itself has a fault can be judged according to the potential abnormality at the two ends of the switching element 52, and the switching element 52 with the fault or the load connected to the switching element having the fault is disconnected, so as to further improve the safety of the whole circuit.
It should be noted that the detection module 81 of this embodiment applies various sensors, and besides detecting a telecommunication number, it can also detect signals such as resistance and temperature rise, and so on, for more comprehensive monitoring, so as to improve the intelligent degree of this embodiment. In addition, the specific structure and operation principle of the detection module 81 are well known to those skilled in the art, and therefore are not specifically described in the present embodiment, but this does not prevent the technical features from being implied in the present application.
In one embodiment of the present application, as shown in fig. 3, 8, 9, 13 and 14, each of the three switch assemblies 52 includes a support cover 521, a shutter assembly 523 and a pair of fixed contact rods 522, wherein the upper and lower ends of the support cover 521 are respectively and fixedly sleeved with a fixed seat 6, so that the support cover 521 is fixedly connected with the inner wall of the mounting frame 4 through the fixed seats 6; an inner cavity 5210 is formed in the support cover 521, meanwhile, symmetrical positioning seats 5213 are radially arranged in the middle of the support cover 521, and the positioning seats 5213 penetrate through the side wall of the support cover 521, so that one end of each positioning seat 5213 extends into the inner cavity 5210, and therefore when the flashboard assembly 523 is installed in the inner cavity 5210, the flashboard assembly 523 is rotationally matched with the end parts of the two positioning seats 5213 through two ends; a through groove 5211 is further formed in the side wall of the support cover 521 in the vertical direction of the axis of the positioning seat 5213, the through groove 5211 penetrates through the inner cavity 5210, and meanwhile, two side ends of the through groove 5211 are flush with the end surface of the positioning seat 5213 extending into the inner cavity 5210, so that the gate plate assembly 523 can rotate around the axis of the positioning seat 5213 along the through groove 5211; two ends of the support cover 521 are also provided with positioning chutes 5212, the positioning chutes 5212 are communicated with the inner cavity 5210, the two fixed contact rods 522 are respectively in sliding fit with the positioning chutes 5212 at the two ends of the support cover 521, so that one end of each of the two fixed contact rods 522 extends into the inner cavity 5210 and is used for being matched with two ends of the gate plate assembly 523, and meanwhile, the other ends of the two fixed contact rods 522 are respectively correspondingly connected with the two connecting plate assemblies 53; the driving shaft 51 penetrates through the positioning seat 5213 and cooperates with the shutter assembly 523, so that the shutter assembly 523 is driven to be connected or disconnected with the two fixed contact rods 522 by the axial movement or rotation of the driving shaft 51, thereby realizing the opening or closing of the whole switch assembly 52.
In this embodiment, as shown in fig. 5, 6, 11 and 15, three shutter assemblies 523 are slidably sleeved with a driving shaft 51, the inner walls of the three shutter assemblies 523 are provided with driving blocks 5234, the side walls of the driving shaft 51 are axially provided with slide rail grooves 510 corresponding to and communicated with the shutter assemblies 523 in number, the projection included angle between adjacent slide rail grooves 510 in the axial direction of the driving shaft 51 is 45 ° to 90 °, preferably 60 °, and the side walls of the driving shaft 51 are further provided with a plurality of avoidance grooves at intervals along the circumferential direction and the avoidance grooves are communicated with the slide rail grooves 510; the drive block 5234 is adapted to mate with the slide rail slot 510 and the escape slot;
when the output power in the circuit is too large and the number of loads connected into the circuit needs to be increased, the driving shaft 51 is driven by the driving device to only move axially, so that the driving block 5234 slides along the sliding rail groove 510 to drive a plurality of gate plate assemblies 523 to sequentially rotate to be connected with the fixed contact rods 522 at two ends, and the required number of switch assemblies 52 are switched into the circuit to ensure that a plurality of loads are simultaneously connected into the circuit to simultaneously store electricity, thereby reducing the storage pressure of a single load; when a load or a switch component 52 connected to a circuit breaks down, the driving block 5234 on each gate plate component 523 is respectively matched with the corresponding sliding rail groove 510 and the avoiding groove in a cooperative manner through the axial movement and the rotation of the driving shaft 51, so that the gate plate component 523 on the switch component 52 with the fault or connected with the fault load is disconnected from the fixed contact rods 522 at the two ends, and the load which works well is connected to the circuit through the switch component 52, so that the switch component 52 with the fault or connected with the fault load is switched off in the circuit, and the circuit can continue to work normally, and the safety of the whole circuit is improved.
Specifically, as shown in fig. 5 and 6, the slide rail grooves 510 include straight slide grooves 5101 and inclined slide grooves 5102, wherein the radian of the axial projection of the inclined slide grooves 5102 on the driving shaft 51 is pi/4-pi/2 rad, and adjacent slide rail grooves 510 are sequentially communicated through the straight slide grooves 5101 and the inclined slide grooves 5102; when the slide rail groove 510 is designed, the axial length of the inclined slide groove 5102 can be defined as Δ L, and further, according to the total number n of the switch assemblies 52, the axial length of the straight slide groove 5101 can be defined as (n-1) Δ L, and the spacing distance between the adjacent driving blocks 5234 is (n +1) Δ L; therefore, when the number of the switch assemblies 52 connected into the circuit needs to be increased, the driving shaft 51 is driven by the driving device to move gradually along the axial direction by the length of Δ L, so that the gate assemblies 523 can be driven to be connected with the fixed contact rod 522 sequentially.
In this embodiment, the specific operation principle of the driving shaft 51 driving the switching assembly 52 to open or close can be illustrated by fig. 16 and 17. As shown in fig. 16 and 17, the driving shaft 51 may be divided, and since the present application employs three switch assemblies 52, three slide rail grooves 510 are disposed on the driving shaft 51, and the three slide rail grooves 510 are sequentially illustrated as a section a, a section B, and a section C in fig. 16 and 17, in order to ensure the normal operation of the slide rail grooves 510, the driving shaft 51 is provided with a straight groove having a section D at the end of the slide rail groove 510, and the length of the straight groove having the section D is equal to the length of the slide rail groove 510; each slide rail groove 510 and the straight groove are equally divided into three small sections a, B and C, the length of each small section is delta L, in the sections A, B and C, the inclined sliding groove 5102 is located in the section a, and the straight sliding groove 5101 is located in the sections B and C; the avoidance groove comprises a first avoidance groove 5103, a second avoidance groove 5104, a third avoidance groove 5105, a fourth avoidance groove 5106, a fifth avoidance groove 5107 and a sixth avoidance groove 5108, the first avoidance groove 5103 is communicated with the head end of the section A along the anticlockwise direction (the right view direction of the driving shaft 51), the second avoidance groove 5104 is communicated with the junction of the sections B and C in the section B along the clockwise direction, the third avoidance groove 5105 is communicated with the junction of the sections a and B in the section B along the clockwise direction, the fourth avoidance groove 5106 and the fifth avoidance groove 5107 are respectively communicated with the junction of the sections a and B in the section C along the clockwise direction and the anticlockwise direction, the sixth avoidance groove 5108 is communicated with the junctions of the sections C and D along the clockwise direction, wherein the arcs of the first avoidance groove 5103, the second avoidance groove 5104, the third avoidance groove 5105, the fourth avoidance groove 5106 and the sixth avoidance groove 5108 are equal to L5104, while the arc of the fifth bypass groove 5107 is 2L, the driving block 5234 is replaced by a black dot in the figure, and the direction indicated by an arrow in the figure is the driving direction.
As shown in part (i) of fig. 16, at this time, the three switch assemblies 52 are in the open state, and from right to left, the three switch assemblies 52 are located at the boundary positions of the sections a and B, the boundary positions of the sections B and C in the section C, and the boundary positions of the sections a and B in the section D.
As shown in part (ii) of fig. 16, at this time, the driving shaft 51 is driven by the driving device to move axially leftward by a length Δ L, so that the switching assembly 52 located at the boundary position of the section a and the section B slides along the section a of the section a, and thus the switching assembly 52 is connected with the two-end contact rod 522 through the rotation of the shutter assembly 523 to implement closing; meanwhile, the switch component 52 positioned at the junction of the sections b and C in the section C slides along the section C in the section C and is still in a brake-off state; the switch assembly 52 located at the intersection of the segments a and b in segment D slides along the segment b in segment D and remains in the open state.
As shown in part (iii) of fig. 16, the driving shaft 51 is driven by the driving device to move axially leftward by a length Δ L, so that the switching assembly 52 located at the intersection of the segments a and b in segment a slides along the segment b in segment a and is still in the closed state; meanwhile, the switch component 52 located at the junction position of the section B and the section C slides along the section a of the section B, so that the switch component 52 is switched on by switching off; the switch assembly 52 located in the b and c segments of segment D slides along the c segment of segment D and remains in the open state.
As shown in part (iv) of fig. 16, at this time, the driving shaft 51 is driven by the driving device to axially move to the left again by the length Δ L, so that the switching assembly 52 located in the sections b and c in section a slides along the section c in section a and is still in the closing state; meanwhile, the switch component 52 located at the junction of the segment a and the segment B in the segment B slides along the segment B of the segment B and is still in a closing state; the switch assembly 52 located at the intersection of the sections C and D slides along the section a of the section C, so that the switch assembly 52 is switched on by switching off.
When a fault occurs in three loads or three switch assemblies 52, the result of the fault is that one fault occurs in three, that is, one switch assembly 52 needs to be opened in three switch assemblies 52, which has three possibilities, three switch assemblies 52 from right to left are represented by x, y and z, that is, the switch assemblies 52 capable of working normally in the fault can be represented by (x, y), (x, z) and (y, z); or two of three faults occur, i.e., two of the three switch assemblies 52 need to be opened, and there are three possible situations, i.e., the switch assemblies 52 that can function properly in the fault situation are denoted as (x), (y), and (z).
For (x), it is only necessary to move the driving shaft 51 to the state shown in part (ii) of fig. 16, and the switch assemblies 52 indicated by y and z are both in the open state.
For (y), the driving shaft 51 is moved to the state shown in (iii) of fig. 16, and then the counterclockwise rotation L arc shown in (v) of fig. 17 is performed, at this time, the switching component 52 shown by y is engaged with the third bypass groove 5105, the switching component 52 shown by z is engaged with the sixth bypass groove 5108, so that the switching component 52 shown by y is still in the closed state, the switching component 52 shown by z is still in the open state, and the switching component 52 shown by x is turned over by the driving of the side wall of the straight chute 5101, so that the switching component 52 shown by x is changed from the closed state to the open state.
For (z), the driving shaft 51 is moved to the state shown in fig. 16 (iv), and then the instantaneous needle rotation of 2L arc is performed as shown in fig. 17 (viii), and at this time, the switching component 52 shown by z is engaged with the fifth bypass groove 5107, so that the switching component 52 shown by z is in the closed state; meanwhile, the switching component 52 denoted by x is driven by the side wall of the first avoidance groove 5103 to turn over, so that the switching component 52 denoted by x is changed from closing to opening; the switching assembly 52 denoted by y is driven by the side wall of the straight chute 5101 to turn over, so that the switching assembly 52 denoted by y is changed from closing to opening.
For (x, y), three cases are also distinguished: x is independently switched on, y is independently switched on, and x and y are simultaneously switched on; wherein the separate closing of x and y is as shown above (x) and (y); when x and y are simultaneously turned on, the driving shaft 51 is simply moved to a state shown in part (iii) in fig. 16.
For (x, z), three cases are also distinguished: x is independently switched on, z is independently switched on, and x and z are simultaneously switched on; wherein the separate closing of x and z is as shown above (x) and (z); when x and z are simultaneously switched on, the driving shaft 51 is only required to move to the state shown in part (iv) in fig. 16, and then the clockwise rotation L arc shown in part (vii) in fig. 17 is performed, at this time, the switching component 52 shown by z is matched with the fifth bypass groove 5107, the switching component 52 shown by x is matched with the first bypass groove 5103, so that the switching components 52 shown by x and z are still in the switched-on state, and the switching component 52 shown by y is driven by the side wall of the straight chute 5101 in the section B to turn over, so that the switching component 52 shown by y is changed from switched-on to switched-off.
For (y, z), three cases are also distinguished: y is independently switched on, z is independently switched on, and y and z are simultaneously switched on; wherein y and z are independently switched on as shown in (y) and (z) above; when y and z are simultaneously switched on, the driving shaft 51 is driven to the state shown in part (iii) in fig. 16, and then anticlockwise rotation L radian shown in part (vi) in fig. 17 is performed, at this time, the switch component 52 shown by y is matched with the second avoidance groove 5104, and the switch component 52 shown by z is matched with the fourth avoidance groove 5106, so that the switch components 52 shown by y and z are still in the switched-on state; and the switching component 52 denoted by x is driven by the side wall of the straight chute 5101 in the section a to turn over, so that the switching component 52 denoted by x is changed from closing to opening.
In one embodiment of the present application, as shown in fig. 10, 11, 13 and 14, the gate plate assembly 523 includes a supporting sleeve 5231 and a driving sleeve 5233, wherein the driving sleeve 5233 is fixedly mounted on an inner wall of the supporting sleeve 5231, the driving sleeve 5233 is rotatably matched with the positioning seat 5213, a driving block 5234 is disposed on the inner wall of the driving sleeve 5233, two pairs of symmetrical movable gate plates 5232 are disposed on an outer side wall of the supporting sleeve 5231, and a closing gap is formed between each pair of movable gate plates 5232; meanwhile, one end of the fixed contact rod 522, which is located outside the inner cavity 5210, is a connection end 5221, the fixed contact rod 522 is connected with the connecting plate assembly 53 through the connection end 5221, and a contact 5222 is arranged at the end of the fixed contact rod 522, which is located inside the inner cavity 5210, so that when the gate plate assembly 523 and the fixed contact rod 522 are switched on, the contact 5222 is located in a switching-on gap through the rotation of the gate plate assembly 523, and then the two pairs of movable gate plates 5232 are respectively in compression fit with the contacts 5222 at the two ends; when the shutter member 523 is opened from the fixed contact rod 522, the two pairs of movable shutters 5232 are disengaged from the two end contacts 5222 by the reverse rotation of the shutter member 523.
In one embodiment of the present application, as shown in fig. 8, 9 and 11, the opposite end surfaces of the positioning seat 5213 in the inner cavity 5210 are provided with the track grooves 5214, and both ends of the driving sleeve 5233 are also provided with the track grooves 5214, so that when the driving sleeve 5233 is matched with the positioning seat 5213, the driving sleeve 5233 and the track grooves 5214 on the positioning seat 5213 are matched with each other to form a raceway, and a plurality of rolling bodies 7 are installed in the raceway, so that the driving sleeve 5233 and the positioning seat 5213 are in rolling fit, and therefore, the wear between the driving sleeve 5233 and the positioning seat 5213 is reduced.
In one embodiment of the present application, as shown in fig. 10 to 14, the outer side wall of the movable gate 5232 is fixedly provided with a pulling plate 5235, and a pulling groove is formed in the pulling plate 5235, and the two sides of the contact 5222 are fixedly provided with a guiding pin 5223, and the guiding pin 5223 is adapted to cooperate with the pulling groove, so that when the movable gate 5232 and the contact 5222 are disengaged from each other, the guiding pin 5223 slides along the pulling groove to drive the fixed contact rod 522 to axially move in a direction away from the contact 5222, thereby increasing the separation speed of the movable gate 5232 and the contact 5222, and improving the opening efficiency of the switch assembly 52.
In this embodiment, as shown in fig. 14, the pulling groove specifically includes a pulling chute 5236 and a pulling arc groove 5237, wherein the pulling chute 5236 is communicated with the pulling arc groove 5237 by the end, and the pulling arc groove 5237 is concentric with the support sleeve 5231, while both ends of the pulling chute 5236 and the pulling arc groove 5237 are communicated with the side wall of the pulling plate 5235; when the movable shutter 5232 and the contact 5222 are disengaged from each other, the guide pin 5223 first drives the fixed contact rod 522 to move axially by sliding along the pull chute 5236, then as the movable shutter 5232 continues to rotate, the guide pin 5223 slides into the pull arc groove 5237, and the fixed contact rod 522 is axially kept stationary by sliding the guide pin 5223 along the pull arc groove 5237, so that the fixed contact rod 522 is prevented from being touched by mistake.
In one embodiment of the present application, as shown in fig. 2, 4 and 7, the driving device includes a rotary driving device 2 and a telescopic driving device 3, wherein the rotary driving device 2 may be a motor or other device with similar function, the rotary driving device 2 is fixedly installed on one side of the mounting frame 4, an output end of the rotary driving device 2 extends into the mounting frame 4 and is connected with a spline shaft 201, and one end of the driving shaft 51 is provided with a spline groove 5109, so that the rotary driving device 2 drives the driving shaft 51 to rotate through the cooperation of the spline shaft 201 and the spline groove 5109; telescopic driving device 3 can be the pneumatic cylinder, pneumatic cylinder or other device that has similar function, telescopic driving device 3 fixed mounting is in the opposite side of mounting bracket 4, and telescopic driving device 3's output stretches into in mounting bracket 4 and is connected with telescopic link 301, and drive shaft 51's the other end is provided with spread groove 5110 simultaneously, so that telescopic driving device 3 passes through telescopic link 301 and spread groove 5110's cooperation, can drive shaft 51 and carry out axial displacement.
In one embodiment of the present application, as shown in fig. 4, the connecting plate assembly 53 includes connecting plates 530 equal in number to the switch assemblies 52, and the connecting plate assembly 53 at the input end of the switch assembly 52 further includes a connecting cable 531, so that three connecting plates 530 at the upper end of the switch assembly 52 are connected in series through the connecting cable 531, the connecting plate 530 at the upper end of the switch assembly 52 is connected to the input end of each switch assembly 52, one of the three connecting plates 530 is communicated with a connecting seat 533, and sliding seats 532 are fixed to the two remaining connecting plates 530, so that the connecting plate assembly 53 at the upper end of the switch assembly 52 is communicated with the power output device through the connecting seats 533; and the three connection plates 530 of the link plate assembly 53 at the output end of the switch assembly 52 are independent of each other, and one end of each connection plate 530 is connected to the output end of the corresponding switch assembly 52, the other end of each connection plate 530 is connected to a load, so that the entire switching device 5 is connected in series in the circuit, and each switch assembly 52 is connected in the circuit independently of each other, so that communication between each load and the power output device is controlled.
In this embodiment, as shown in fig. 3, the upper portion of the rear sidewall of the mounting bracket 4 is provided with the upper sliding grooves 410 corresponding to the number of the connecting plates 530, so that the connecting plate assembly 53 at the input end of the switch assembly 52 is sequentially in sliding fit with the upper sliding grooves 410 through the connecting seats 533 and the sliding seats 532; meanwhile, the partition plate 41 is arranged on the lower portion of the mounting frame 4, and the lower sliding grooves 420 corresponding to the connecting plates 530 in number are formed in the partition plate 41, so that the connecting plate assembly 53 at the output end of the switch assembly 52 is in sliding fit with the lower sliding grooves 420 in sequence through the connecting seat 533, and therefore when the switch assembly 52 is switched off, the fixed contact rods 522 at the two ends can move axially smoothly.
The present application further provides an operating method applied to the above-mentioned dc power distribution switch, as shown in fig. 18, including a monitoring system 8 and a switching device 5, where the monitoring system 8 includes a detection module 81 and a control module 82, the detection module 81 is used to detect an electrical signal of the switching device 5, and the detection module 81 is electrically connected to the control module 82, and the control module 82 is also electrically connected to a driving device, so that the control module 82 responds to the driving device according to the detected electrical signal; the specific working method comprises the following steps:
s100: when the power output device needs to generate power, the switch assembly 52 close to the side part is switched on to enable a load connected with the switch assembly 52 to be conducted with a circuit, so that the power output device is stored through the load, and at the moment, the detection module 81 detects that the total current at the input end of the circuit is I and transmits a current signal to the control module 82;
s200: the control module 82 compares the total current I with the rated current I of the load according to the current signal0Carrying out comparison; when I < I0When so, the control module 82 does not respond to the drive; when (n-1) I0＜I＜nI0When n is greater than 1, the control module 82 controls the telescopic driving device 3 to drive the driving shaft 51 to move by (n-1) Δ L length, so that (n-1) switch assemblies 52 are switched on in sequence; when I > nI0Meanwhile, the control module 82 controls the driving device to respond, so that all the switch assemblies 52 are switched off and alarm is given; where n represents the total number of switch assemblies 52, and n > 1;
when I < nI0And then, the following steps are continued:
s300: the detection module 81 performs potential detection on the input end and the output end of the switching component 52 switched on in S200, and the detected input end potential is
Detection of an output terminal potential of
And transmits the detected voltage signal to the control module 82; where N is used to denote any of the switch assemblies 52;
s400: the control module 82 may derive the voltage division for each switch assembly 52 based on the input voltage signal
To obtain the actual resistance value of each switch assembly 52
S500: the control module 82 will physically block each switch assembly 52Value RNWith its rated resistance value RN0By comparison, if R appearsNGreater than kRN0And k is a correction coefficient and indicates that the switch assembly 52 itself or a load connected in series with the switch assembly 52 has a fault, at this time, the control module 82 controls the telescopic driving device 3 and the rotary driving device 2 to cooperatively respond so as to open the switch assembly 52, thereby protecting the safety of the whole circuit. It will be appreciated that controlling the telescopic drive 3 and the rotary drive 2 in cooperation in response to the operation of the drive shaft 51 is as described above.
Meanwhile, step S400 of this embodiment further includes the following steps:
s410: the control module 82 divides the voltage of each switching element 52 every unit time Δ T
The recording is performed so as to obtain two instantaneous partial voltages of each switching element 52 at a distance Δ T
And
wherein t represents any time;
s420: the control module 82 divides the voltage according to the instant in S410
And
the voltage division increment of each switch component 52 at each delta T time can be obtained
S430: the control module 82 increments Q based on the successive voltage divisionstCan be found as an approximation function f (q) for the partial pressure increase; it will be appreciated that the approximation function f (q) may be selected based on actual measured data dispersion, for example by least squares or the like.
S440: the control module 82 may calculate the voltage division value of each switching element 52 at the time after the next Δ T time according to the obtained approximation function f (q)
And the partial pressure value
The operation is carried out in step S400, and step S500 is performed according to the calculated value, so that the load or the switching element 52 can be switched off before the load or the switching element reaches a complete failure, thereby improving the safety of the whole circuit.
It can be understood that the fault process of the load or the switch component 52 is a process of changing into a variable quantity to a variable quantity, and the switch component 52 is switched off when the load or the switch component 52 reaches the fault variable quantity, which has a great safety hazard, but the application can predict the fault variable quantity process of the load or the switch component 52 through the approximate function f (q), so as to switch off the load or the switch component 52 before the fault variable quantity process reaches the fault variable quantity, thereby effectively improving the safety of the circuit.
In the embodiment, the value of the correction coefficient k is 1.1-1.5, and the unit time delta T is 10-30 min.
In this embodiment, as shown in fig. 18, the monitoring system 8 further includes a communication module 83, and the communication module 83 is electrically connected to the control module 82, so that when the monitoring system 8 monitors that the switch assembly 52 or the load has a fault, the communication module 83 sends a fault signal to the monitoring center to alarm.
In the present embodiment, the detection module 81 includes a hall sensor, so that the detection module 81 detects a current as well as a potential in the circuit by the hall sensor.
It is understood that, according to the voltage division principle of the series circuit, when the fault determination of the load is performed, the fault condition of the load may be determined according to the potential change across the switching member 52 for the convenience of detection.
The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.
Claims (6)
1. A line detection system for a power distribution switch, comprising:
the refrigerator comprises a cabinet body, wherein an upper mounting cavity and a lower mounting cavity are arranged in the cabinet body;
a plurality of switch assemblies mounted within the upper mounting cavity, the switch assemblies adapted to connect a plurality of loads in parallel with a power output device, respectively;
the detection module is connected with the switch assembly and is suitable for detecting electric signals of the input end and the output end of the switch assembly; and
the control module is installed in the lower installation cavity, is electrically connected with the detection module and is suitable for controlling the switch assembly to switch off or switch on according to the electric signal change of the detection module.
2. The line detection system for a power distribution switch of claim 1, wherein: the detection module is suitable for detecting the total current input into the switch components, so that the control module controls the number of the switch components in the access circuit according to the total current, and further controls the number of loads in the access circuit.
3. The line detection system for a power distribution switch of claim 2, wherein: the detection module is further suitable for detecting electric potentials at two ends of each switch assembly, so that the control module can be used for switching off the switch assemblies with abnormal electric potentials.
4. A line sensing system for a power distribution switch as defined in claim 3, wherein: the upper mounting cavity is internally provided with a driving device, the driving device is electrically connected with the control module, and the driving device is suitable for being matched with the switch assembly through a driving shaft, so that the control module controls the driving device to switch off or switch on the switch assembly according to the electric signal of the detection module.
5. The line detection system for a power distribution switch of claim 4, wherein: and a communication module is further installed in the lower installation cavity and electrically connected with the control module, so that when the detection module detects that the potential of the switch assembly is abnormal, the control module controls the communication module to generate an alarm signal to a monitoring center.
6. A line sensing system for a power distribution switch according to any of claims 1 to 5, wherein: the detection module comprises a plurality of Hall sensors which are correspondingly connected with the input end and the output end of the switch assembly, so that the detection module detects the total current input into the switch assembly and the electric potential at two ends of each switch assembly through the Hall sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121951850.1U CN215934157U (en) | 2021-08-19 | 2021-08-19 | Line detection system of power distribution switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121951850.1U CN215934157U (en) | 2021-08-19 | 2021-08-19 | Line detection system of power distribution switch |
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| Publication Number | Publication Date |
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| CN215934157U true CN215934157U (en) | 2022-03-01 |
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| CN202121951850.1U Active CN215934157U (en) | 2021-08-19 | 2021-08-19 | Line detection system of power distribution switch |
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- 2021-08-19 CN CN202121951850.1U patent/CN215934157U/en active Active
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Assignee: Ningbo Tianzhi Electric Technology Co.,Ltd. Assignor: NINGBO TIANAN SMART GRID TECHNOLOGY CO.,LTD. Contract record no.: X2023980053427 Denomination of utility model: A Line Detection System for Distribution Switches Granted publication date: 20220301 License type: Common License Record date: 20231221 |