Three-phase sequence indicator and system

Abstract

The invention discloses a three-phase phase sequence indicator and system, wherein the three-phase phase sequence indicator comprises a controller, a GPS module, a phase sequence indicator light, a current sampling circuit, and a wireless communication module, all of which are connected to the controller, and also comprises a current sensor, which is connected to the current sampling circuit; the GPS module obtains satellite time and synchronizes it to the controller clock; the current sampling circuit senses and collects current through the current sensor, and regularly uploads it to a server through the wireless communication module; when an external interruption is caused by current zero crossing, the controller records the current zero crossing moment, and obtains the clock reference source current zero crossing moment and the power grid cycle from the server through the wireless communication module; the controller calculates the current phase angle difference according to the current zero crossing moment, the clock reference source current zero crossing moment and the power grid cycle, and identifies the current phase sequence at this time according to the relationship between the phase angle difference, the current direction and the phase sequence; the phase sequence indicator light identifies the current phase sequence through different colors.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary equipment of power systems, and in particular to a three-phase phase sequence indicator and a system thereof. Background Art

[0002] With the development of cities, urban facilities are becoming more and more complete, and the power cable power supply network is growing. The phase sequence identification of urban distribution network cables and the measurement of electrical quantities during operation are very important links in daily operation and maintenance. During cable installation or equipment acceptance, due to the complexity of the power supply network of the distribution system and the many line branches, if the phase sequence is inconsistent before and after construction or emergency repair, it will cause phase-to-phase short circuit when closing the loop. Direct power supply to users is likely to cause reversal and damage of three-phase equipment, causing damage to electrical equipment, and in serious cases, causing cross-level power grid accidents. Therefore, the following situations require confirmation that the phase and phase sequence are correct before power can be supplied: (1) Construction and maintenance of interconnected and transferable power lines, replacement of wires, reconnection of cables or making intermediate joints, and connection of jumpers. (2) Switches of newly commissioned interconnectable lines. (3) Reconnection of incoming power and busbars involving dual-power distribution stations. (4) Other construction and maintenance work that may cause disorder.

[0003] The traditional distribution network system phase check is done on the primary side after the construction and maintenance work is completed and the power is supplied. High voltage operation has a high risk factor. Some working spaces are small and the equipment in the cabinet is compactly arranged, which can easily cause equipment short circuit accidents. If it is a fully enclosed switch cabinet, the primary side cannot be phase checked. The power supply needs to be reversed to the outdoor pole switch. The operator climbs the pole and checks the phase on both sides of the pole switch, which not only increases the operation volume and work intensity, but also has a high risk factor. The biggest drawback of this method is that it cannot be operated outdoors in bad weather. If the phase and phase sequence of the phase check results are inconsistent, it is necessary to shut down the power again and reconnect, which will extend the power outage time and affect the normal production of users. In addition, for fully enclosed metal switch cabinets, the primary side cannot be phase checked after power is supplied.

[0004] During the phase checking of traditional distribution network cables, the entire cable testing process requires the staff at both ends of the cable to communicate at any time, and the communication method is mainly handheld devices or walkie-talkies. Because the distribution room or ring network station is sometimes underground, or the wireless signal is shielded due to building structure and location factors, it is difficult for the phase checking staff to communicate. Therefore, when encountering communication difficulties, multiple walkie-talkies are usually used as an intermediate link, and multiple staff members pass on the information step by step. The defects of doing so are: ① It is easy to make mistakes when passing on the information step by step. If a staff member in the middle link does not express clearly, it is easy to cause operational errors, which in serious cases will affect personal safety and equipment safety. ② Low work efficiency and long working hours. ③ The number of staff increases, and labor costs increase.

[0005] At present, there are two types of power data measurement methods: traditional contact measurement and non-contact measurement in the emerging field: contact measurement is the traditional method of measurement, that is, directly using the measuring instrument (voltage transformer) to contact the high-voltage electrical equipment to be measured, converting the primary voltage and current into secondary signals and transmitting them to the measuring instrument for conversion and display; non-contact, as the name implies, is that the measuring equipment does not directly contact the high-voltage electricity, and uses electromagnetic phenomena for detection and measurement. Because the contact measurement method requires the measuring equipment to contact the high-voltage equipment to be measured, this method is very dangerous under the influence of various environmental and human factors, and it cannot be carried out when the cable is energized. If the normal operation of the power grid is adversely affected by the detection, it will cause some unnecessary losses. Therefore, the contact measurement method cannot achieve real-time monitoring and inspection of the cable anytime and anywhere. Non-contact measurement overcomes the above shortcomings and provides the possibility for real-time monitoring and detection of high-voltage cables and equipment at any time and anywhere. Therefore, non-contact high-voltage signal measurement is slowly replacing the traditional contact measurement method and has become the main direction of current power detection development.

[0006] In the current low-voltage distribution network, the current detection units are basically installed inside the substation and at the end of the line where the user is located, while there are few devices that can monitor the current at the key nodes in the middle of the cable line connecting them. With the access of a large number of distributed power sources and fluctuating loads such as electric vehicle charging, the operation mode and power flow distribution of the distribution network will also change significantly, which will bring severe challenges to the distribution network status monitoring, online fault identification and optimization scheduling. In order to more accurately monitor the operation status of the distribution network, it is imperative to add more measurement points in the distribution network. When performing three-phase measurement, at least three sets of current transformers need to be installed at the same time, which puts higher requirements on the volume, insulation strength and stability of the sensor. Therefore, the traditional electrical quantity measurement method has been difficult to meet the development needs of the distribution network. Research and invention of current sensors based on new principles are of great significance to promote the further development of smart grids.

[0007] In short, with the rapid development of power grid construction and the expansion of the areas through which transmission lines pass, the power grid operation and maintenance departments urgently need to study a non-contact phase sequence identification and power monitoring device to solve the current problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a three-phase phase sequence indicator and system that automatically detects the phase sequence of a three-phase transmission line and effectively displays it, in view of the defects in the prior art that the phase sequence identification of the power grid is inconsistent, incorrect, or the identification is faded and cannot be recognized.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] Provided is a three-phase phase sequence indicator, comprising a controller, and a GPS module, a phase sequence indicator light, a current sampling circuit, and a wireless communication module all connected to the controller. The three-phase phase sequence indicator also comprises a current sensor connected to the current sampling circuit;

[0011] The GPS module obtains satellite time and synchronizes it to the controller clock;

[0012] The current sampling circuit collects the current through the current sensor and regularly uploads it to the server through the wireless communication module;

[0013] When an external interruption is caused by current zero crossing, the controller records the current zero crossing time t1, and obtains the clock reference source current zero crossing time t0 and the grid cycle T from the server through the wireless communication module; the controller calculates the current phase angle difference according to the current zero crossing time t1, the clock reference source current zero crossing time t0 and the grid cycle T, and identifies the phase sequence of the line at this time according to the relationship between the phase angle difference, the current direction and the phase sequence;

[0014] The phase sequence indicator light identifies the phase sequence of the current through different colors.

[0015] According to the above technical solution, the controller identifies the phase sequence and stores the phase sequence in the Flash.

[0016] According to the above technical solution, the controller regularly identifies the phase sequence and automatically updates after the phase sequence changes.

[0017] According to the above technical solution, the controller performs hardware self-detection regularly and uploads the working status and fault information to the server through the wireless communication module.

[0018] According to the above technical solution, the three-phase phase sequence indicator also includes a charging circuit, and a solar panel and a rechargeable battery both connected to the charging circuit.

[0019] According to the above technical solution, the solar panel is a flexible panel.

[0020] The present invention also provides a three-phase phase sequence indication system, comprising a clock reference source, a plurality of three-phase phase sequence indicator groups, a cloud server and a user end;

[0021] The clock reference source is used to obtain satellite time, record the current zero-crossing moment when the line current passes through zero, and record the power grid cycle through the time difference between two zero-crossings, and then send the current zero-crossing moment and power grid cycle to the cloud server;

[0022] Each three-phase phase sequence indicator group includes a master phase sequence indicator and multiple slave phase sequence indicators; wherein the master phase sequence indicator is the three-phase phase sequence indicator in the above technical solution; both the master and slave phase sequence indicators include a radio frequency module, and the two communicate via radio frequency; when the current passes through zero, the master phase sequence indicator sends the local phase sequence and phase detection synchronization signal to the slave phase sequence indicator, and the slave phase sequence indicator starts timing from the receipt of the phase detection synchronization signal, records the time difference of the current passing through zero, calculates the phase angle difference based on the time difference, and determines its own phase sequence based on the relationship between the phase angle difference and the phase sequence of the master phase sequence indicator and displays it through the indicator light;

[0023] The user side monitors the current of each line through the cloud server.

[0024] Following the above technical solution, the cloud server pushes various fault information of the monitoring points to the user end in the form of voice, text messages, and APP pop-up windows.

[0025] In accordance with the above technical solution, the system also includes a remote controller for waking up the three-phase phase sequence indicator or re-identifying the phase sequence.

[0026] Following the above technical solution, the cloud server determines whether the line is faulty based on the uploaded current information, and displays the status information of the clock reference source, and also displays the GPS position and current information of each of the three phase sequence indicators in the line.

[0027] The beneficial effects of the present invention are as follows: the present invention utilizes the non-contact measurement principle, combines wireless transmission technology, information technology and software technology, realizes online monitoring of electric energy parameters and phase sequence, can effectively monitor the phase sequence and some electric energy parameters of 380V-110kV cables and overhead lines of the distribution network, improves work efficiency, ensures the correct phase sequence of the distribution network lines and the safe and reliable operation of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0029] Figure 1 1 is a schematic structural diagram of a three-phase phase sequence indicator according to an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of a clock reference source according to an embodiment of the present invention;

[0031] Figure 3 1 is a schematic structural diagram of a main phase sequence indicator according to an embodiment of the present invention;

[0032] Figure 4 is a structural schematic diagram of a phase sequence indicator according to an embodiment of the present invention;

[0033] Figure 5It is a structural schematic diagram of a three-phase phase sequence indication system according to an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of a three-phase phase sequence indicator according to an embodiment of the present invention;

[0035] Figure 7 The explosion of the three-phase sequence indicator of the embodiment of the present invention Figure 1 ;

[0036] Figure 8 The explosion of the three-phase sequence indicator of the embodiment of the present invention Figure 2 ;

[0037] Fig. 9 This is a schematic diagram of the structure of the main support body of the embodiment of the present invention. Figure 1 ;

[0038] Fig.10 This is a schematic diagram of the structure of the main support body of the embodiment of the present invention. Figure 2 ;

[0039] Fig.11 This is a schematic diagram of the structure of the main support body of the embodiment of the present invention. Figure 3 . DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The three-phase phase sequence indicator of the embodiment of the present invention is as follows: Figure 1 As shown, it includes a controller 11, and a current sampling circuit 12, a phase sequence indicator light 13, a wireless communication module 14, and a GPS module 15 all connected to the controller. The three-phase phase sequence indicator also includes a current sensor 16 connected to the current sampling circuit 12. The wireless communication module can be implemented by a GPRS module.

[0042] The GPS module 15 acquires satellite time and synchronizes it to the controller clock.

[0043] The current sampling circuit 12 collects current through the current sensor 16 and regularly uploads it to the server through the wireless communication module 14. According to the time interval set by the server, the current can be collected at this interval and the current value can be uploaded to the server. The current is sensed by the current sensor 16, and the wire to be tested does not need to be stripped, thereby realizing non-contact current collection.

[0044] When the current zero crossing causes an external interruption, the controller 11 records the current zero crossing time t1, and obtains the clock reference source current zero crossing time t0 and the grid cycle T from the server through the wireless communication module (the clock reference source here is mainly used to obtain satellite time, and records the current zero crossing time t0 when the line current passes through zero, and records the grid cycle T through the time difference between two zero crossings, and then sends the current zero crossing time and the grid cycle to the cloud server; the clock reference source provides a phase angle clock reference for the phase sequence indicator within the same system, which can be stored and transferred through the cloud server and sent to the phase sequence indicator); the controller calculates the current phase angle difference based on the current zero crossing time t1, the clock reference source current zero crossing time t0 and the grid cycle T, and identifies the current phase sequence at this time based on the relationship between the phase angle difference, current direction and phase sequence.

[0045] The calculation formula of phase angle difference θ is:

[0046]

[0047] Where % represents the remainder operation, (t1-t0)%T represents the remainder of the difference between the current zero-crossing time t1 and the clock reference source current zero-crossing time t0 divided by the grid period T. The relationship between the phase angle difference and the phase and current direction is:

[0048] Phase angle difference Phase sequence Current direction 0～27 A + 33～87 C - 93～147 B + 153～207 A - 213～257 C + 273～327 B - 333～360 A +

[0049] The judgment of whether the current passes through zero can be realized by a comparator, and an interruption of the current passing through zero is provided (the same is true in other embodiments below). The phase sequence indicator light 13 identifies the phase sequence of the current by different colors. The phase sequence indicator light 13 can be implemented by a plurality of high-brightness LED lights of different colors. For example, the ABC phases are identified by yellow, green, and red colors, and the blue color indicates that the phase is not determined.

[0050] Furthermore, the controller 11 identifies the phase sequence and stores the phase sequence in the Flash, so that the phases of the relevant lines can be displayed even in the event of a power outage.

[0051] Furthermore, the controller 11 regularly identifies the phase sequence, automatically updates after the line phase sequence changes, and automatically changes the phase display.

[0052] The controller 11 performs hardware self-detection regularly and uploads the working status and fault information to the server via the wireless communication module 14 .

[0053] In order to improve the battery life, the three-phase phase sequence indicator also includes a charging circuit, and a solar panel and a rechargeable battery connected to the charging circuit. The solar panel continuously charges the rechargeable battery to ensure that the phase sequence indicator can work uninterruptedly without an external power supply even if it works for a long time. Among them, the solar panel is a flexible panel. The shell of the phase sequence indicator can be set as a transparent cylindrical shell, and the flexible solar panel is arranged on the cylindrical wall to better collect sunlight.

[0054] The three-phase phase sequence indication system of the embodiment of the present invention can automatically detect the phase sequence of the three-phase transmission line. According to needs, the phase sequence change can be set to automatically update, and the power outage phase sequence can be maintained. Furthermore, a high-brightness LED can be used to display the phase sequence, truly realizing a power transmission and distribution auxiliary tool with unified phase sequence display for the entire network, solving the pain points of inconsistent and incorrect phase sequence identification in the current power grid, and faded and unrecognizable identification.

[0055] like Figure 5 As shown, the entire system includes a clock reference source 501, multiple phase sequence indicator groups 5021, 5022, ... 502n, and also includes a cloud server 503 and user terminals 5041, 5042, ... 504n.

[0056] The clock reference source 501 is used to obtain satellite time, record the current zero-crossing moment when the line current passes through zero, and record the power grid cycle through the time difference between two zero-crossings, and then send the current zero-crossing moment and the power grid cycle to the cloud server; the clock reference source provides a phase angle clock reference for the phase sequence indicator within the same system, and is stored and transferred through the cloud server and sent to the phase sequence indicator. The phase sequence indicator can identify the line phase and display it based on the acquired line current, phase angle and clock reference.

[0057] like Figure 2 As shown, the clock reference source 501 includes a controller 201, a current sampling circuit 202, a phase sequence indicator light 203, a wireless communication module 204, and a GPS module 205. The wireless communication module 204 can be implemented by a GPRS module. The clock reference source 501 obtains satellite time through the GPS module 205 and synchronizes it to the clock of the controller 201; when the current passes through zero, the current sampling current 202 records the moment t0 of the current passing through zero, and records the power grid cycle T through the time difference between the two zero crossings, and uploads the moment t0 of the current passing through zero and the power grid cycle T to the cloud server 503 through the GPRS module.

[0058] Each three-phase phase sequence indicator group includes a main phase sequence indicator and multiple slave phase sequence indicators; wherein the main phase sequence indicator is the three-phase phase sequence indicator in the above embodiment. Both the master and slave phase sequence indicators include a radio frequency module, and the two communicate via radio frequency; when the current passes through zero, the main phase sequence indicator sends the local phase sequence and phase detection synchronization signal to the slave phase sequence indicator, and the slave phase sequence indicator starts timing from the receipt of the phase detection synchronization signal, records the time difference of the current passing through zero, calculates the phase angle difference based on the time difference, and determines its own phase sequence based on the relationship between the phase angle difference and the phase sequence of the main phase sequence indicator and displays it through the indicator light.

[0059] Multiple user terminals monitor the current of each line through the cloud server 503. The cloud server 503 can determine whether the line is faulty based on the uploaded current information. If the current of a single line exceeds the set threshold, it can be determined to be a ground short circuit; if the current of two / three lines exceeds the threshold, it can be determined to be a phase-to-phase short circuit.

[0060] The cloud server pushes various fault information of monitoring points to the user end through voice, text messages, and APP pop-up windows, including overcurrent (overload), ground short circuit, phase-to-phase short circuit, etc.

[0061] The main phase sequence indicator is mainly used to calculate the phase angle difference between the clock reference source and the indicator to determine the phase of the current. Since it is necessary to communicate with the slave phase sequence indicator, a radio frequency module is added. Figure 3 As shown, the main phase sequence indicator includes a controller 301, a current sampling circuit 302, a phase sequence indicator light 303, a wireless communication module 304, a GPS module 305, a radio frequency module 306, and a current sensor 307. The wireless communication module 304 can be implemented by a GPRS module.

[0062] Specifically, the main phase sequence indicator mainly obtains satellite time through the GPS module and synchronizes it to the single-chip computer clock (the controller can be implemented by the single-chip computer); when the current zero-crossing causes an external interruption, the current sampling circuit 302 records the time t1 when the current crosses zero, and obtains the clock reference source current zero-crossing time t0 and the grid cycle T from the cloud server through the GPRS module, and calculates the phase angle difference (see the above embodiment for details). Finally, the phase sequence ABC is determined according to the relationship between the current direction, the phase angle difference and the phase sequence. When the current crosses zero, the main phase sequence indicator sends the local phase X and the phase detection synchronization signal to the slave phase sequence indicator through the current sampling circuit 302 through the radio frequency module 306.

[0063] From the phase sequence indicator Figure 4 As shown, the system includes a controller 401, a current sampling circuit 402, a phase sequence indicator light 403, a radio frequency module 404, and a current sensor 405. The timing starts from when the phase sequence indicator receives the phase detection synchronization signal through the radio frequency module 404, and the current sampling circuit 402 detects the current zero crossing and records the time difference t diff , the calculation formula of phase angle difference is:

[0064]

[0065] Where % is the remainder operation and T is the power grid period.

[0066] The relationship between the phase angle difference, phase, and current direction is as follows:

[0067] Phase angle difference Phase sequence 90～150 X+1 210～260 X+2

[0068] Among them, X is the host phase, and X+1 is the phase after the host phase. For example, if the host phase is B, then X+1 is the C phase, and X+2 is the A phase.

[0069] Furthermore, the system also includes a remote controller (not shown in the figure) for waking up the master and slave phase sequence indicators or re-identifying the phase sequence.

[0070] In order to achieve lower power consumption and effective phase sequence display function, the master and slave phase sequence indicators wake up once every period of time (such as 5s), and are in sleep mode at other times. After waking up, the master phase sequence indicator waits for a certain period of time (such as 20ms) and then sends a synchronous clock signal before sleeping. The slave phase sequence indicator sleeps after receiving the sleep signal. The slave phase sequence indicator waits for more than a certain period of time (such as 5.2s) before returning to sleep. Due to the manufacturing error of the crystal oscillator and the relationship between temperature drift, the sleep time of the master and slave phase sequence indicators is likely to be inconsistent. The slave phase sequence indicator modifies its own sleep time according to the time it waits for the host each time to ensure effective communication signal reception and shorter wake-up time.

[0071] After the remote control is pressed, the power display module of the remote control will display whether the battery is out of power and needs to be replaced, and send display / re-phase identification data through the RF module at fixed intervals (such as 1ms). Press the remote control until the three indicator lights light up and then release it, and the remote control will automatically power off. The main phase sequence indicator and the slave phase sequence indicator can receive the data sent by the remote control at the wake-up interval (such as every 5s). When receiving the display data, the main phase sequence indicator and the slave phase sequence indicator lights light up for phase display; when receiving the re-phase identification data, the main phase sequence indicator performs the process described in the first section. After successful identification, the host light lights up and simulates the remote control to send display data to the slave phase sequence indicator, and then immediately sends a phase identification synchronization signal. The slave phase sequence indicator performs the process described in the second section. After the identification is completed, the phase display is updated immediately. If the main phase sequence indicator fails to identify the phase sequence, a blue light will be displayed. After the light goes out, you can press the remote control to try again.

[0072] When in sleep mode, the controller and RF module of the main phase sequence indicator work in a low power consumption state, and the current sampling circuit, phase sequence indicator light, GPS module and GPRS module directly cut off the power supply, achieving very low standby power consumption.

[0073] When only the main phase sequence indicator or the slave phase sequence indicator is phase-detected, the current sampling circuit needs to be powered. When only the main phase sequence indicator needs phase-detected, the GPS module and GPRS module need to be powered. When only the remote control is pressed to control the light to turn on, the phase indicator light needs to be powered. The power consumption is still low in the awake state.

[0074] In a preferred embodiment of the present invention, the clock reference source 501 uploads the grid cycle T at the time t0 when the current crosses zero every 10 seconds, and uploads the state data of the reference source every minute.

[0075] The status data includes: geographic location information obtained through the GPS module, GPS signal strength, GPRS signal strength, current value collected through the current sampling circuit, working status information of the main phase sequence indicator and other status data.

[0076] After the main phase sequence indicator is powered on, it will delay for a period of time (such as 2 minutes) to update the phase sequence and upload the status data, and calculate the number of wake-up times required for the next phase sequence update based on the clock. It will be reduced by 1 each time it is woken up. When it is reduced to 0, the phase sequence will be updated and the status data will be uploaded, and the number of wake-up times required for the next phase sequence update will be calculated.

[0077] The status data includes: geographic location information obtained through the GPS module, GPS signal strength, GPRS signal strength, current value collected through the current sampling circuit, working status information of the main phase sequence indicator and other status data.

[0078] When the rechargeable battery is fully charged, the solar cell will provide power, which will cause the battery overvoltage protection and cause the main circuit voltage to rise. When it is detected that the battery voltage is greater than the preset value, the microcontroller and radio frequency will no longer sleep and will consume power. When the voltage drops to the preset value, they will return to normal sleep.

[0079] like Figure 6 , 7 As shown in Figures 8 and 9, in one embodiment of the present invention, a three-phase phase sequence indicator (or clock reference source) comprises a housing 3, a main support body 5 and a base 2. The housing 3 is a transparent shell and is detachably mounted on the main support body 5. A clamping member 6 is provided on the main support body 5. The clamping member 6 is mainly used to clamp cables.

[0080] A solar panel 12, a rechargeable battery 4, and a circuit board 11 are arranged in the main support body 5. The solar panel 12 is a flexible board arranged along the inner wall of the housing 3. The circuit board 11 is fixed on the base 2 and is provided with a charging circuit. The solar panel 12 and the rechargeable battery 4 are both connected to the charging circuit. The solar panel 12 continuously charges the rechargeable battery 4, ensuring that the three-phase phase sequence indicator can work uninterruptedly without an external power supply even if it works for a long time.

[0081] The circuit board 11 also includes a main board circuit, which is connected to the charging circuit. The main board circuit includes a microprocessor, a GPS / Beidou communication receiving module, a signal indicator light, a recording / sampling circuit, and a wireless communication module, all of which are connected to the microprocessor. The main circuit board 11 also includes a current sensor, which is connected to the recording / sampling circuit. When the current passes through zero, the three-phase phase sequence indicator obtains the phase-discrimination synchronization signal through the recording / sampling circuit and starts timing, detects the current zero crossing, records the time difference, and calculates the phase angle difference. The phase sequence is determined according to the relationship between the phase angle difference and the phase and current direction. When the current is abnormal, it indicates and uploads the fault information to the background server.

[0082] Furthermore, the carriers of the various components inside the main support body 5 are designed to be stretched as a whole without an inner cavity, thus ensuring smooth processing and demoulding.

[0083] Specifically, the main support body 5 includes a fixed support portion, an expansion portion and a sealing portion.

[0084] like Fig. 9 , 10 As shown, the fixed support part is symmetrically provided with fixing holes 55 for fixing the clamping member 6. The fixing holes 55 can be designed as square holes. The symmetrically designed square holes are used to connect the sheet metal clamping members and fix the three-phase phase sequence indicator, and the square hole design is convenient for filling glue. A battery box 51 is also provided in the fixed support part, in which the rechargeable battery 4 is fixed. The battery box 51 is designed with a specific length, width and height ratio according to the size of the rechargeable battery 4 to ensure that the rechargeable battery 4 is easy to fix and not easy to fall off. In a preferred embodiment of the present invention, the fixed support part can be designed as a cylindrical structure, so that the solar panel 12 has enough space while ensuring that there is enough space inside.

[0085] Furthermore, the sealing portion is provided with a thread 54, which is threadedly connected to the housing 3 and is squeezed and sealed with the housing 3 by a waterproof sealing ring 13. The waterproof sealing ring can be a rubber ring.

[0086] The extension part is an extension platform, on which aviation plug mounting holes 52 and 53 are provided for mounting aviation connectors, which connect the circuit board 11 with the external communication port through the aviation connectors; the mounting holes of the extension part can be sealed with glue to prevent moisture from penetrating from the mounting holes. The purpose of adopting the design of the extension platform is to transmit data between the internal circuit and the external communication, and at the same time, the space is large enough to facilitate the installation of aviation connectors and sealing. The extension platform can adopt a concave design to prevent demoulding problems.

[0087] The transparent shell 3 has the functions of windproof, waterproof, light transmission and resistance to certain pressure. Transparent UV-resistant material can be used. Considering the impact during transportation and installation and the effect of strong ultraviolet rays on the plastic molecular structure in the open air environment, weather-resistant and UV-resistant material is used. This material has good light transmittance and can transmit most of the pipelines, so that the internal circuit board can absorb enough energy to power the battery, and at the same time transmit the internal signal light so that it can be absorbed by the outside world. The shell 3 can be interlocked and sealed with the main support body 5 and the waterproof gasket through the threaded structure to prevent water vapor in the air from entering the interior and corroding the electronic components, and it is also waterproof and dustproof.

[0088] Furthermore, the expansion part of the embodiment of the present invention is provided with two aviation connectors, one aviation connector 9 is externally connected to the external GPS antenna, and the other aviation connector 10 is connected to the current sensor. In the embodiment of the present invention, a 6mm aviation plug and a 12mm aviation plug are provided, and both aviation connectors are external extensions, providing data transmission channels between the internal circuit and the outside. The 6mm aviation plug is externally connected to the external GPS antenna. The 12mm aviation plug is externally connected to the current sensor.

[0089] The rechargeable battery 4 provides power for the internal circuit board 11. In this embodiment, the rechargeable battery 4 is a lithium battery, which has the advantages of intelligence, high efficiency, safety, long-lasting power supply, and mature technology.

[0090] Furthermore, in a preferred embodiment of the present invention, Fig. 9 , 10 As shown, the main support body 5 is also provided with a first notch 56, and the base 2 is provided with a second notch (not shown in the figure); the main support body 5 is also provided with a solar baffle 1, and the solar panel 12 is fixed on the solar baffle 1 through the first notch 56 and the second notch. The solar baffle 1 mainly positions, supports and fixes the solar panel 12. At the same time, the second notch on the main support body 5 and the base 2 is used to fix the solar panel 12 so that it fits the outer wall of the main support body 5.

[0091] Furthermore, in another embodiment of the present invention, Fig.11 As shown, the solar baffle 1 is a left-right asymmetrical structure to prevent installation errors. The support height design of the solar baffle 1 provides maximum space for the solar panel 12 while supporting the base 2 to prevent the solar panel 12 from being squeezed during installation. The main support body 5 is also provided with a plurality of evenly distributed reinforcing ribs 57 (four are provided in the embodiment of the present invention). The reinforcing ribs 57 are mainly used to reinforce the cylindrical wall of the main support body 5, and also support the circuit board 11, that is, the circuit board 11 is placed on a small platform formed on the top of a plurality of reinforcing ribs. Furthermore, a positioning block 58 may be provided on the top of one or more of the reinforcing ribs to position the circuit board 11.

[0092] The housing 3 and the main support body 5 are both cylindrical, and the interior of the base 2 is funnel-shaped. The circular design cooperates with the main support body 5 to make the internal circuit board 11 fit on the base 2 to prevent loose rotation. The funnel-shaped design can withstand the pressure from the periphery and center of the circuit board 11, so that the circuit board 11 is evenly stressed, and the circuit board 11 is prevented from bending and deforming and damaging the circuit. A square hole (consistent with the shape of the signal indicator light) is also opened in the middle of the base 2, which is used for positioning and as a divergent channel for the light source. The funnel-shaped design is used to concentrate the light in a certain direction for easy observation with the naked eye.

[0093] Furthermore, the clamping member 6 includes a base 8, a sheet metal part and a pressure spring 7. The base 8 is a V-shaped structure, and anti-slip limit strips are symmetrically provided on the two inclined surfaces of the V-shaped structure; the sheet metal part is a tuning fork shape, and the pressure spring 7 is fixed on the sheet metal part. The pressure spring 7 presses the cable against the base 8, so that the three-phase phase sequence indicator is fixed on the cable.

[0094] In the embodiment of the present invention, the sheet metal part adopts a tuning fork-shaped design to increase the contact surface with the glue and ensure its reliability. The pressure spring 7 is used to press the cable against the base 8 to keep its position fixed. The base 8 adopts a V-shaped structure design and cooperates with the spring to keep the cable position in the middle to prevent sliding and phase tilt. The rough surface structure design increases friction.

[0095] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A three-phase phase sequence indication system, characterized in that: It includes a clock reference source, multiple three-phase phase sequence indicator groups, a cloud server and a user end; The clock reference source is used to obtain satellite time, record the current zero-crossing moment when the line current passes through zero, and record the power grid cycle through the time difference between two zero-crossings, and then send the current zero-crossing moment and power grid cycle to the cloud server; Each three-phase phase sequence indicator group includes a master phase sequence indicator and multiple slave phase sequence indicators; wherein, both the master and slave phase sequence indicators include radio frequency modules, and the two communicate via radio frequency; when the current passes through zero, the master phase sequence indicator sends the local phase sequence and phase detection synchronization signal to the slave phase sequence indicator, and the slave phase sequence indicator starts timing from receiving the phase detection synchronization signal, records the time difference of the current passing through zero, calculates the phase angle difference based on the time difference, and determines its own phase sequence based on the relationship between the phase angle difference and the phase sequence of the master phase sequence indicator and displays it through the indicator light; The user side monitors the current of each line through the cloud server; The main phase sequence indicator includes a controller, a GPS module, a phase sequence indicator light, a current sampling circuit, and a wireless communication module, all of which are connected to the controller. The main phase sequence indicator also includes a current sensor, which is connected to the current sampling circuit. The GPS module obtains satellite time and synchronizes it to the controller clock; The current sampling circuit collects the current through the current sensor and regularly uploads it to the server through the wireless communication module; When an external interruption is caused by current zero crossing, the controller records the current zero crossing time t1, and obtains the clock reference source current zero crossing time t0 and the grid cycle T from the server through the wireless communication module; the controller calculates the current phase angle difference according to the current zero crossing time t1, the clock reference source current zero crossing time t0 and the grid cycle T, and identifies the current phase sequence at this time according to the relationship between the phase angle difference, the current direction and the phase sequence; The phase sequence indicator lights use different colors to identify the phase sequence of the circuit.

2. The three-phase sequence indication system according to claim 1, characterized in that: The cloud server pushes various fault information of monitoring points to the user end through voice, text messages, and APP pop-up windows.

3. The three-phase sequence indication system according to claim 1, characterized in that: The system also includes a remote controller for waking up the three-phase phase sequence indicator group to work or re-identifying the phase sequence.

4. The three-phase sequence indication system according to claim 1, characterized in that: The cloud server determines whether a line fault occurs based on the uploaded current information and displays the status information of the clock reference source. It also displays the GPS position and current information of each of the three phase sequence indicators in the line.

5. The three-phase sequence indication system according to claim 1, characterized in that: After the controller identifies the phase sequence, it stores the phase sequence in the Flash.

6. The three-phase sequence indication system according to claim 1, characterized in that: The controller identifies the phase sequence regularly and automatically updates when the phase sequence changes.

7. The three-phase sequence indication system according to claim 1, characterized in that: The controller performs hardware self-test regularly and uploads the working status and fault information to the server through the wireless communication module.

8. The three-phase phase sequence indication system according to any one of claims 1 to 7, characterized in that: The three-phase phase sequence indication system also includes a charging circuit, and a solar panel and a charging battery both connected to the charging circuit.

9. The three-phase sequence indication system according to claim 8, characterized in that: The solar panels are flexible panels.

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