Low-voltage uninterruptible meter replacement auxiliary device

Abstract

The utility model provides a low-voltage non-power-cut meter replacement auxiliary device, which comprises an auxiliary device body, and the auxiliary device body comprises a controller, and a metering chip and a relay which are electrically connected with the controller. The metering chip is electrically connected to three-phase power and zero and live wires of user single-phase power; the relays comprise a relay I, a relay II, a relay III, a relay IV, a relay V and a relay N; one ends of the relay I, the relay II, the relay III and the relay N are respectively connected to three-phase four wires of three-phase power, and the other end of the relay N is connected to a zero line terminal and a live line terminal of single-phase power of a user through the relay IV; and the other ends of the relay I, the relay II and the relay III are connected to a zero line terminal and a live line terminal through a relay V. When the device is used for replacing the electric energy meter, the relay in the device is closed, the single-phase power of a user is supplied by a closed relay line, and the user is not powered off, so that low-voltage meter replacement without power failure is realized.

Description

Technical Field

[0001] The utility model belongs to the field of power equipment, and particularly relates to an auxiliary device for replacing electricity meters without power interruption at low voltage. Background Art

[0002] In recent years, with the continuous improvement of China's economic development level, the electricity consumption of various domestic industries and residents has shown a steady growth trend. People's demand for electricity is getting higher and higher, the requirement for electricity consumption experience is getting higher and higher, and the requirement for power supply reliability is also increasing with the continuous improvement of living quality. For the replacement work of the electric energy metering device, it will inevitably cause the power outage of the backend user line, and the complex environment of the construction site and the number of work items will directly affect the power outage duration of the on-site users. Long-term power outage operation will bring a bad electricity consumption experience to users. At the same time, the process of disassembling and replacing the electricity meter is relatively troublesome, and there is a risk of incorrect wiring during the connection process of different phase lines. During the process of staff disassembling and installing equipment, there is also a possibility of touching the live part, which will directly affect the personal safety of the staff.

[0003] At present, the main problems existing in the current way of replacing electricity meters are as follows:

[0004] 1) It brings losses to users' electricity consumption when replacing the electricity meter. During the replacement cycle of the electricity meter, it will cause problems such as power outage for users and damage to user equipment, thus reducing the service quality;

[0005] 2) The replacement efficiency is low. Before replacing the electricity meter, it is necessary to notify users, which consumes a lot of manpower and material resources and has low work efficiency;

[0006] 3) The work quality is poor. During the process of replacing the electricity meter with power outage, there are problems of incorrect wiring and missing wiring, reducing the service quality and work efficiency.

[0007] Therefore, an auxiliary device that can perform the electricity meter replacement service without power interruption is provided to better improve the safety and reliability of customers' electricity consumption. Summary of the Invention

[0008] In order to solve the problem that replacing the electricity meter requires power outage operation, which seriously affects the user's electricity consumption experience, an auxiliary device for replacing electricity meters without power interruption at low voltage is provided.

[0009] The technical solution adopted by the utility model is as follows:

[0010] The utility model provides an auxiliary device for replacing electricity meters without power interruption at low voltage, including an auxiliary device body, and the auxiliary device body includes a metering chip, a relay, a controller, and a power supply module for providing power for the auxiliary device for replacing electricity meters without power interruption at low voltage;

[0011] The auxiliary device body is provided with an A-phase terminal, a B-phase terminal, a C-phase terminal and an N-phase terminal of a three-phase four-wire system for electrically connecting three-phase electricity, as well as a neutral wire terminal and a live wire terminal for electrically connecting the neutral and live wires of the user's single-phase electricity; the VA, VB, and VC channels of the metering chip are respectively electrically connected to the A-phase terminal, the B-phase terminal, and the C-phase terminal, the IC channel of the metering chip is electrically connected to the live wire terminal, and the IA channel of the metering chip is connected to the live wire terminal through a current transformer;

[0012] The relay includes Relay I, Relay II, Relay III, Relay IV, Relay V and Relay N; one end of Relay I is connected to the A-phase terminal, one end of Relay II is connected to the B-phase terminal, one end of Relay III is connected to the C-phase terminal, and one end of Relay N is connected to the N-phase terminal; the other end of Relay N is connected to the neutral wire terminal and the live wire terminal through Relay IV; the other ends of Relay I, Relay II and Relay III are connected to the neutral wire terminal and the live wire terminal through Relay V;

[0013] The controller is communicatively connected to the metering chip and is controllably connected to Relay I, Relay II, Relay III, Relay IV, Relay V and Relay N.

[0014] Based on the above, it further includes an input voltage wire and an air switch clamp wire; one end of the input voltage wire is used to access the three-phase four-wire of the three-phase electricity, and the other end is used to connect the A-phase terminal, B-phase terminal, C-phase terminal and N-phase terminal of the auxiliary device body; one end of the air switch clamp wire is used to access the live wire and the neutral wire of the user's single-phase electricity, and the other end is used to connect the live wire terminal and the neutral wire terminal of the auxiliary device body.

[0015] Based on the above, the input voltage wire includes four fully enclosed alligator clips respectively used to connect the three-phase four-wire of the three-phase electricity, four rubber wires, and a self-locking four-core socket male head used to connect the auxiliary device body; the four fully enclosed alligator clips are respectively connected to one end of the four rubber wires in one-to-one correspondence, the other ends of the four rubber wires are respectively connected to the four welding needles at the tail of the self-locking four-core socket male head in one-to-one correspondence, and the four welding needles at the tail of the self-locking four-core socket male head are connected to the four pin holes at its head in one-to-one correspondence; the four pin holes at the head of the self-locking four-core socket male head are respectively used to plug into the terminal posts of the A-phase terminal, B-phase terminal, C-phase terminal and N-phase terminal of the auxiliary device body.

[0016] Based on the above, the colors of the three fully enclosed alligator clips for connecting the A-phase, B-phase, and C-phase of the three-phase four-wire of the three-phase electricity are yellow, green, and red respectively, and the color of the fully enclosed alligator clip for connecting the N-phase of the three-phase four-wire of the three-phase electricity is black; the colors of the four rubber wires are yellow, green, white, and black respectively, and the four fully enclosed alligator clips of yellow, green, red, and black are respectively in one-to-one correspondence with the four rubber wires of yellow, green, white, and black.

[0017] Based on the above, the air switch clamp wire sleeve includes an air switch clamp for clamping on the user-side air switch in front of the electricity meter, a cable, and a self-locking 3+4 core socket male head for connecting the auxiliary device body; the air switch clamp includes a C-shaped clamp housing adapted to the front side of the air switch and a grounding clip; two copper columns spaced left and right are fixedly embedded on the front side of the lower clamp block of the C-shaped clamp housing, and a platinum resistor is pressed on the wire skin at the inner end contact of at least one copper column; a travel switch is provided on the upper clamp block of the C-shaped clamp housing, and the contact of the travel switch protrudes from the lower side of the upper clamp block of the C-shaped clamp housing; the seven welding needles at the tail of the self-locking 3+4 core socket male head are respectively connected in one-to-one correspondence with the two copper columns, a grounding clip, the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor through the cable, and the seven welding needles at the tail of the self-locking 3+4 core socket male head are connected in one-to-one correspondence with the seven pinholes at its head; the three pinholes at the head of the self-locking 3+4 core socket male head corresponding to the two copper columns and a grounding clip are respectively used for inserting the wiring terminals of the live wire terminal, neutral wire terminal, and ground wire terminal of the auxiliary device body; the other four pinholes at the head of the self-locking 3+4 core socket male head corresponding to the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor are respectively used for inserting the wiring terminals electrically connected to the I / O pins of the controller of the auxiliary device body.

[0018] Based on the above, the cable includes 3 14AWG rubber wires for connecting the self-locking 3+4 core socket male head with the two copper columns and a grounding clip; 4 22AWG rubber wires for connecting the self-locking 3+4 core socket male head with the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor.

[0019] Based on the above, the power supply module is powered by a lithium battery.

[0020] Based on the above, the metering chip uses the ADE9078ACPZ chip.

[0021] Based on the above, the controller uses the STM32F405RGT6 chip.

[0022] Based on the above, the auxiliary device body also includes a power button for starting up, a display panel for displaying an operation interface, an operation panel with a connection button and a disconnection button, a flash chip for backing up the meter changing process data, and a USB interface for exporting the meter changing process data.

[0023] The utility model has substantial features and progress compared with the prior art, specifically:

[0024] 1. The low-voltage non-stop meter replacement auxiliary device of the utility model can assist in realizing non-stop meter replacement;

[0025] The phase sequence is measured by the metering chip, and then the relay corresponding to the phase sequence is controlled to be on and off. Even if the user's single-phase electricity L and N are connected in reverse order, the energy meter can be replaced normally.

[0026] In addition, when the air switch on the user side is disconnected and the electricity meter is replaced, the relay in the device is energized, and the user's single-phase electricity is supplied by the energized relay line, while the replaced meter part is not energized and the user does not stop power, thus realizing low-voltage and non-stop power meter replacement.

[0027] 2. The input voltage line of the utility model can effectively prevent leakage and has a high safety factor;

[0028] Use fully enclosed alligator clips of corresponding colors to clamp to the corresponding three-phase electrical phase lines, which can quickly connect the three-phase electricity to the auxiliary device body with high efficiency and no errors or omissions;

[0029] The self-locking four-core jack male connector is connected to the matching three-phase power input female connector on the auxiliary device body, which can effectively prevent leakage, improve the safety factor, and prevent wrong connection or missing connection.

[0030] 3. The utility model's air-opening clamp wire sleeve operation is simple, safe and reliable;

[0031] When in use, the C-type clamp housing is directly clamped on the air switch on the user side, so that the right copper column can contact the neutral wire terminal at the outlet end of the air switch on the user side, and the left copper column can contact the live wire terminal at the outlet end of the air switch on the user side. At the same time, the grounding clamp is grounded, which eliminates the potential safety hazard of permanent damage to the line due to skin breakage and short circuit, and will not cause phase-to-phase short circuit.

[0032] Then plug the self-locking 3+4-core male jack into the matching female jack on the auxiliary device body, so that the user's single-phase electricity can be connected to the auxiliary device body, and then disconnect the air switch on the user side to replace the electricity meter without power outage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a principle block diagram of the utility model.

[0034] Figure 2 It is a schematic structural diagram of the input voltage line of the present utility model.

[0035] Figure 3 It is Figure 2 the A-direction view of the male head of the self-locking four-core socket in

[0036] Figure 4 It is a schematic structural diagram of the wire sleeve of the air switch clamp of the present utility model.

[0037] Figure 5 It is Figure 4 the A-direction view of the male head of the self-locking 3+4-core socket in

[0038] Figure 6 It is Figure 4 the B-direction view of the C-type clamp housing in

[0039] In the figure: 1-1. Fully enclosed alligator clip; 1-2. Rubber wire; 1-3. Male head of self-locking four-core socket; 1-4. Pinhole at the head of the male head of self-locking four-core socket; 2-1. C-type clamp housing; 2-2. Grounding clip; 2-3. Cable; 2-4. Male head of self-locking 3+4-core socket; 2-5. Right copper post; 2-6. Left copper post; 2-7. Platinum resistance; 2-8. Travel switch; 2-9. Pinhole at the head of the male head of self-locking 3+4-core socket. Specific embodiments

[0040] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0041] Embodiment 1

[0042] As Figure 1 shown, this embodiment provides a low-voltage power-off-free meter replacement auxiliary device, including an auxiliary device body, an input voltage line and a wire sleeve of an air switch clamp.

[0043] The auxiliary device body includes a metering chip, a relay, a controller and a power supply module for providing power for the low-voltage power-off-free meter replacement auxiliary device. The auxiliary device body is arranged to electrically connect to the A-phase connection terminal, B-phase connection terminal, C-phase connection terminal and N-phase connection terminal of the three-phase four-wire for connecting three-phase electricity, and the neutral wire connection terminal and live wire connection terminal for electrically connecting the neutral and live wires of the user's single-phase electricity.

[0044] The VA, VB, and VC channels of the metering chip are respectively electrically connected to the A-phase connection terminal, B-phase connection terminal, and C-phase connection terminal, the IC channel of the metering chip is electrically connected to the live wire connection terminal, and the IA channel of the metering chip is connected to the live wire connection terminal through a current transformer;

[0045] The relay includes Relay I, Relay II, Relay III, Relay IV, Relay V and Relay N. One end of Relay I is connected to the A-phase terminal, one end of Relay II is connected to the B-phase terminal, one end of Relay III is connected to the C-phase terminal, and one end of Relay N is connected to the N-phase terminal. The other end of Relay N is connected to the neutral terminal and the live terminal through Relay IV. The other ends of Relay I, Relay II and Relay III are connected to the neutral terminal and the live terminal through Relay V.

[0046] The controller is communicatively connected to the metering chip and is controllably connected to Relay I, Relay II, Relay III, Relay IV, Relay V and Relay N.

[0047] One end of the input voltage line is used to access the three-phase four-wire of the three-phase power supply, and the other end is used to connect to the A-phase terminal, B-phase terminal, C-phase terminal and N-phase terminal of the auxiliary device body.

[0048] One end of the air switch fixture wire is used to access the live wire and the neutral wire of the user's single-phase power supply, and the other end is used to connect to the live wire terminal and the neutral wire terminal of the auxiliary device body.

[0049] Specifically, the power supply module is powered by a lithium battery. The metering chip uses the ADE9078ACPZ chip. Figure 3 Figure 0000113 shows the pin function schematic diagram of the ADE9078ACPZ. This metering chip integrates 7 high-performance ADCs and 1 flexible DSP core. The VA, VB, and VC channels are the 19 / 20, 21 / 22, and 23 / 24 input pins of the metering chip respectively, and are used to judge the A, B, and C phase sequences of the three-phase power supply. The IA channel is the 7 / 8 input pin of the metering chip and is used for the current metering of the user's single-phase power supply. The IC channel is the 11 / 12 input pin of the metering chip respectively and is used to judge the phase of the user's single-phase power supply and the L, N sequence. The controller uses the STM32F405RGT6 chip.

[0050] Furthermore, the auxiliary device body further includes a power button for starting up, a display panel for operating interface display, an operation panel provided with a connection button and a detachment / disconnection button, a flash chip for backing up the data during the meter replacement process, and a USB interface for exporting the data during the meter replacement process.

[0051] The process of performing the power-off-free meter replacement operation based on the low-voltage power-off-free meter replacement auxiliary device described in this embodiment includes the following steps:

[0052] Step 1: Press the power button to start up the device. The device performs a self-check during startup, including: the battery level of the power supply module, the status of the four three-phase access relays (Relay I, Relay II, Relay III, Relay N), the status of the two single-phase LN conversion output relays (Relay IV, Relay V), and the status of the real-time clock, to ensure that the device starts up normally.

[0053] Step 2: After the startup check is normal, the device connects to three-phase power through the input voltage line and connects to the user's single-phase power through the air switch clamp wire.

[0054] Step 3: Read the test data of the VA, VB, and VC channels of the metering chip to determine the phase sequence of phases A, B, and C; read the test data of the IC channel of the metering chip to determine the phase of the user's single-phase power and the L, N sequence; the test data is displayed on the operation interface to confirm that the incoming and outgoing line statuses have been detected.

[0055] Step 4: Click the connection button on the operation panel. The device performs the suction action of the corresponding relay according to the phase sequence of phases A, B, and C tested by the metering chip, the phase of the user's single-phase power, and the L, N sequence.

[0056] If the zero and live wires of the user's single-phase power are reversed, Relays IV and V perform the suction action simultaneously to adjust the zero and live wire sequence; if the zero and live wires of the user's single-phase power are not reversed, Relays IV and V do not operate.

[0057] If the current phase of the user's single-phase power is phase A, Relay I with the suction phase of A is energized.

[0058] If the current phase of the user's single-phase power is phase B, Relay II with the suction phase of B is energized.

[0059] If the current phase of the user's single-phase power is phase C, Relay III with the suction phase of C is energized.

[0060] Step 5: With the device's relays in the suction state, disconnect the user-side air switch to perform the replacement service of the electricity meter. Among them, the meter replacement part is not powered, and the user does not lose power, realizing the replacement of the meter without power interruption at low voltage.

[0061] In other actual examples, the device can access the RS485 communication interfaces of the new and old electricity meters through the RS485 meter reading line to read the data of the new and old electricity meters.

[0062] Step 6: When the new electricity meter is replaced, push up the user-side air switch, then click the disconnection / disconnect button on the operation panel to disconnect each relay, and remove the input voltage line and the air switch clamp wire.

[0063] Step 7: Save the data during the electricity meter replacement process. The data is saved to the flash chip and can also be exported through the USB interface.

[0064] It is understandable that in this embodiment, the metering chip, the controller, and the relay are all conventional technologies, and their specific working principles will not be elaborated here; means such as power-on self-test, metering chip test data, and controlling the on / off of the relay belong to the conventional technologies in this field and do not involve new computer programs.

[0065] Embodiment 2

[0066] This embodiment provides a specific implementation solution for the input voltage line.

[0067] As Figure 2 and Figure 3 shown, the input voltage line includes four fully enclosed alligator clips 1-1 for connecting the three-phase four-wire of three-phase electricity respectively, four rubber wires 1-2, and a self-locking four-core socket male head 1-3 for connecting the auxiliary device body;

[0068] The four fully enclosed alligator clips 1-1 are respectively and correspondingly connected to one end of the four rubber wires 1-2, and the other ends of the four rubber wires 1-2 are respectively and correspondingly connected to four welding needles at the tail of the self-locking four-core socket male head 1-3, and the four welding needles at the tail of the self-locking four-core socket male head 1-3 are respectively and correspondingly connected to four pinholes 1-4 at its head;

[0069] The four pinholes 1-4 at the head of the self-locking four-core socket male head 1-3 are respectively used for plugging into the terminals of the A-phase wiring terminal, B-phase wiring terminal, C-phase wiring terminal, and N-phase wiring terminal of the auxiliary device body.

[0070] It can be understood that the auxiliary device body is provided with a three-phase power input female head corresponding to the self-locking four-core socket male head 1-3, and the three-phase power input female head includes terminals of the A-phase wiring terminal, B-phase wiring terminal, C-phase wiring terminal, and N-phase wiring terminal.

[0071] Specifically, the colors of the three fully enclosed alligator clips 1-1 for connecting the A-phase, B-phase, and C-phase of the three-phase four-wire of three-phase electricity are yellow, green, and red respectively, and the color of the fully enclosed alligator clip 1-1 for connecting the N-phase of the three-phase four-wire of three-phase electricity is black;

[0072] The colors of the four rubber wires 1-2 are yellow, green, white, and black respectively, and the four fully enclosed alligator clips 1-1 of yellow, green, red, and black correspond to the four rubber wires 1-2 of yellow, green, white, and black respectively.

[0073] In this embodiment, the fully enclosed alligator clip 1-1, the rubber wire 1-2, and the self-locking four-core socket male head 1-3 are all existing technologies, and their specific structures and working principles will not be elaborated here.

[0074] When the input voltage line of this embodiment is in use, the male head 1-3 of the self-locking four-core jack is correspondingly plugged into the three-phase power input female head on the auxiliary device body that matches it. Then, the three fully enclosed alligator clips 1-1 in yellow, green, and red are used to connect to the three phases A, B, and C respectively, and the black fully enclosed alligator clip 1-1 is used to connect to the N phase at the same time. The three phases are connected to the corresponding three pinholes 1-4 through the three rubber wires 1-2 in yellow, green, and white, and the N phase is connected to the remaining pinhole 1-4 through the black rubber wire 1-2. The four pinholes 1-4 then connect the three-phase power and the neutral wire to the three-phase power input female head, thus completing the connection of the three-phase power to the auxiliary device body. The three fully enclosed alligator clips 1-1 in yellow, green, and red do not distinguish the phase and can be connected in any order, with simple operation, safety and reliability. Using the fully enclosed alligator clips 1-1 can quickly connect the three-phase power to the auxiliary device body with high efficiency. The male head 1-3 of the self-locking four-core jack is connected to the three-phase power input female head on the auxiliary device body that matches it, effectively preventing electric leakage, improving the safety factor, and preventing wrong connection or missed connection.

[0075] Preferably, the size of the fully enclosed alligator clip 1-1 is 75 mm, the rubber wire 1-2 is 14 AWG SJOW rubber wire; the male head 1-3 of the self-locking four-core jack is an M19 self-locking four-core jack, with a rated current of 15 A and a rated voltage of 300 V.

[0076] Embodiment 3

[0077] This embodiment provides a specific implementation scheme for the wire sleeving of the air switch clamp.

[0078] As Figures 4 - 6 shown, the wire sleeving of the air switch clamp includes an air switch clamp for clamping on the user-side air switch in front of the electric energy meter, a cable wire 2-3, and a self-locking 3+4-core jack male head 2-4 for connecting to the auxiliary device body;

[0079] The air switch clamp includes a C-shaped clamp housing 2-1 adapted to the front side of the air switch and a grounding clip 2-2;

[0080] On the front side of the lower clamp block of the C-shaped clamp housing 2-1, two copper columns (2-5, 2-6) spaced left and right are fixedly embedded, and a platinum resistor 2-7 is pressed on the wire skin at the inner end contact of at least one copper column;

[0081] The upper clamp block of the C-shaped clamp housing 2-1 is provided with a travel switch 2-8, and the contact of the travel switch 2-8 protrudes from the lower side of the upper clamp block of the C-shaped clamp housing;

[0082] The seven welding needles at the tail of the self-locking 3+4 core socket male head 2-4 are respectively connected to two copper posts (2-5, 2-6), a grounding clip 2-2, the common point of the travel switch 2-8, the normally open point of the travel switch 2-8, and both ends of the platinum resistor 2-7 through the cable, and the seven welding needles at the tail of the self-locking 3+4 core socket male head 2-4 are connected to the seven pin holes 2-9 at its head in one-to-one correspondence;

[0083] The three pin holes 2-9 at the head of the self-locking 3+4 core socket male head 2-4 corresponding to two copper posts (2-5, 2-6) and a grounding clip 2-2 are respectively used to plug the connection posts of the live wire terminal L, the neutral wire terminal N, and the grounding wire terminal GND of the auxiliary device body;

[0084] The other four pin holes 2-9 at the head of the self-locking 3+4 core socket male head 2-4 corresponding to the common point PT-1 of the travel switch 2-8, the normally open point PT-2 of the travel switch 2-8, and both ends (XC-1, XC-2) of the platinum resistor 2-7 are respectively used to plug the connection posts electrically connected to the I / O pins of the controller of the auxiliary device body.

[0085] The cable 2-3 includes 3 pieces of 14AWG rubber wires for connecting the self-locking 3+4 core socket male head 2-4 to two copper posts (2-5, 2-6) and a grounding clip 2-2; 4 pieces of 22AWG rubber wires for connecting the self-locking 3+4 core socket male head 2-4 to the common point PT-1 of the travel switch 2-8, the normally open point PT-2 of the travel switch 2-8, and both ends (XC-1, XC-2) of the platinum resistor 2-7.

[0086] Preferably, the self-locking 3+4 core socket male head 2-4 is an M19 self-locking 3+4 core socket male head, with a rated current of 15A / 3A and a rated voltage of 300V / 60V.

[0087] It can be understood that the auxiliary device body is provided with a female head corresponding to the self-locking 3+4 core socket male head 2-4, and the female head includes connection posts for the live wire terminal, the neutral wire terminal, the grounding wire terminal, and connection posts electrically connected to the I / O pins of the controller.

[0088] When the air switch clamp wire set of this embodiment is in use, the upper clamp block and the lower clamp block of the C-shaped clamp housing 2-1 are directly clamped on the user-side air switch, that is, the upper clamp block and the lower clamp block of the C-shaped clamp housing 2-1 are clamped on the front end of the user-side air switch. The right copper column 2-5 and the left copper column 2-6 are respectively inserted into the screw mounting holes of the zero-line and live-line terminal blocks at the lower front outlet end of the user-side air switch, so that the right copper column 2-5 contacts the zero-line terminal block of the user-side air switch outlet end, and the left copper column 2-6 contacts the live-line terminal block of the user-side air switch outlet end. At the same time, the grounding clip 2-2 is grounded. After the C-shaped clamp housing 2-1 is clamped to the user-side air switch and in place, the contact (ball) of the travel switch 2-8 is squeezed up to make the normally open point of the travel switch 2-8 closed. Then, the self-locking 3+4 core jack male head 2-4 is correspondingly plugged into the matching female head on the auxiliary device body. Furthermore, the zero line and the live line at the outlet end of the user-side air switch are respectively connected to the auxiliary device body, realizing the connection of the user's single-phase electricity to the auxiliary device body. When the user-side air switch is disconnected, the electricity meter can be replaced without power outage, with simple operation, safety and reliability, convenience and speed, and high efficiency.

[0089] Among them, when the normally open point of the travel switch 2-8 is closed, the travel switch 2-8 is connected to the controller in the auxiliary device body through the cable 2-3 and the self-locking 3+4 core jack male head 2-4. The controller collects the change of the switching value of the travel switch 2-8 to determine whether the clamp is securely installed.

[0090] At the same time, both ends of the platinum resistor 2-7 are connected to the controller in the auxiliary device body through the cable 2-3 and the self-locking 3+4 core jack male head 2-4. The controller can detect the temperature at the inner end contact of the copper column by detecting the resistance value of the platinum resistor 2-7, and can determine the temperature of the cable in the operation of the auxiliary device body. When the temperature exceeds the temperature rise alarm threshold, the alarm device in the auxiliary device body gives an alarm reminder and protects the operators.

[0091] The grounding clip 2-2, the self-locking 3+4 core jack male head 2-4, the travel switch 2-8, the platinum resistor 2-7 and the alarm device are all conventional technologies, and their specific structures and working principles will not be elaborated here. The detection here belongs to the conventional technology in this field, utilizing the inherent application functions of the travel switch 2-8 and the platinum resistor 2-7, and does not involve new computer programs.

[0092] The grounding clip 2-2 of this embodiment is a fully enclosed alligator clip, and a 14AWG rubber wire connected to the grounding clip 2-2 is led out from the C-shaped clamp housing 2-1.

[0093] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily conceive of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. A low-voltage power-off-free meter replacement auxiliary device, comprising an auxiliary device body, characterized in that, The auxiliary device body includes a metering chip, a relay, a controller, and a power supply module for supplying power to the low-voltage power-off meter replacement auxiliary device; The auxiliary device body is provided with an A-phase terminal, a B-phase terminal, a C-phase terminal, and an N-phase terminal of a three-phase four-wire for electrically connecting three-phase electricity, as well as a neutral wire terminal and a live wire terminal for electrically connecting the neutral and live wires of the user's single-phase electricity; The VA, VB, and VC channels of the metering chip are respectively electrically connected to the A-phase terminal, the B-phase terminal, and the C-phase terminal, the IC channel of the metering chip is electrically connected to the live wire terminal, and the IA channel of the metering chip is connected to the live wire terminal through a current transformer; The relay includes Relay I, Relay II, Relay III, Relay IV, Relay V, and Relay N; One end of Relay I is connected to the A-phase terminal, one end of Relay II is connected to the B-phase terminal, one end of Relay III is connected to the C-phase terminal, and one end of Relay N is connected to the N-phase terminal; The other end of Relay N is connected to the neutral wire terminal and the live wire terminal through Relay IV; The other ends of Relay I, Relay II, and Relay III are connected to the neutral wire terminal and the live wire terminal through Relay V; The controller is communicatively connected to the metering chip and is controllably connected to Relay I, Relay II, Relay III, Relay IV, Relay V, and Relay N.

2. The low-voltage power-off-free meter replacement auxiliary device according to claim 1, wherein: It further includes an input voltage wire and an air switch clamp wire; One end of the input voltage wire is used to access the three-phase four-wire of three-phase electricity, and the other end is used to connect the A-phase terminal, B-phase terminal, C-phase terminal, and N-phase terminal of the auxiliary device body; One end of the air switch clamp wire is used to access the live wire and neutral wire of the user's single-phase electricity, and the other end is used to connect the live wire terminal and neutral wire terminal of the auxiliary device body.

3. The low-voltage power-off-free meter replacement auxiliary device according to claim 2, characterized in that: The input voltage wire includes four fully enclosed alligator clips respectively used to connect the three-phase four-wire of three-phase electricity, four rubber wires, and a self-locking four-core socket male head for connecting the auxiliary device body; The four fully enclosed alligator clips are respectively connected to one end of the four rubber wires in one-to-one correspondence, the other ends of the four rubber wires are respectively connected to the four welding needles at the tail of the self-locking four-core socket male head in one-to-one correspondence, and the four welding needles at the tail of the self-locking four-core socket male head are connected to the four pin holes at its head in one-to-one correspondence; The four pin holes at the head of the self-locking four-core socket male head are respectively used to plug the wiring posts of the A-phase terminal, B-phase terminal, C-phase terminal, and N-phase terminal of the auxiliary device body.

4. The low-voltage power-off meter replacement auxiliary device according to claim 3, characterized in that: The colors of the three fully enclosed alligator clips for connecting the A-phase, B-phase, and C-phase of the three-phase four-wire of three-phase electricity are yellow, green, and red respectively, and the color of the fully enclosed alligator clip for connecting the N-phase of the three-phase four-wire of three-phase electricity is black; The colors of the four rubber wires are yellow, green, white, and black respectively, and the four fully enclosed alligator clips of yellow, green, red, and black are respectively in one-to-one correspondence with the four rubber wires of yellow, green, white, and black.

5. The low-voltage power-off-free meter replacement auxiliary device according to claim 2, characterized in that: The air switch clamp wire set includes an air switch clamp for clamping on the user-side air switch in front of the electricity meter, a cable, and a self-locking 3+4 core jack male head for connecting the auxiliary device body; The air switch clamp includes a C-type clamp housing adapted to the front side of the air switch and a grounding clip; On the front side of the lower clamping block of the C-type clamp housing, two copper columns are fixedly embedded at intervals left and right, and a platinum resistor is pressed on the wire skin at the inner end contact of at least one copper column; The upper clamping block of the C-type clamp housing is provided with a travel switch, and the contact of the travel switch protrudes from the lower side of the upper clamping block of the C-type clamp housing; The seven welding needles at the tail of the self-locking 3+4 core jack male head are respectively connected to the two copper columns, a grounding clip, the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor through the cable, and the seven welding needles at the tail of the self-locking 3+4 core jack male head are connected to the seven pin holes at its head in one-to-one correspondence; The three pin holes at the head of the self-locking 3+4 core jack male head corresponding to the two copper columns and a grounding clip are respectively used for plugging the connection posts of the live wire terminal, neutral wire terminal, and ground wire terminal of the auxiliary device body; The other four pin holes at the head of the self-locking 3+4 core jack male head corresponding to the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor are respectively used for plugging the connection posts electrically connected to the I / O pins of the controller of the auxiliary device body.

6. The low-voltage power-off-free meter replacement auxiliary device according to claim 5, characterized in that: The cable includes 3 pieces of 14AWG rubber wires for connecting the self-locking 3+4 core jack male head to the two copper columns and a grounding clip; 4 pieces of 22AWG rubber wires for connecting the self-locking 3+4 core jack male head to the common point of the travel switch, the normally open point of the travel switch, and both ends of the platinum resistor.

7. The low-voltage power-on meter replacement auxiliary device according to any one of claims 1-6, characterized in that: The power supply module is powered by a lithium battery.

8. The low-voltage power-off-free meter replacement auxiliary device according to any one of claims 1-6, characterized in that: The metering chip uses the ADE9078ACPZ chip.

9. The low-voltage power-off-free meter replacement auxiliary device according to any one of claims 1-6, characterized in that: The controller uses the STM32F405RGT6 chip.

10. The low-voltage power-off-free meter replacement auxiliary device according to any one of claims 1-6, characterized in that: The auxiliary device body further includes a power button for starting up, a display panel for operating interface display, an operation panel provided with connection buttons and detachment / disconnection buttons, a flash chip for backing up the data during the meter replacement process, and a USB interface for exporting the data during the meter replacement process.

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