Electric quantity metering device

Abstract

The invention discloses an electric quantity metering device which comprises a gas tank, a metering chamber arranged on the gas tank, quick plugging heads installed on the two sides of the gas tank and wheels installed at the bottom of the gas tank. The gas tank is filled with insulating gas, and is provided with a current transformer and a voltage transformer connected with the high-voltage bus through a connecting piece; current and voltage signals output by the current transformer and the voltage transformer are transmitted to the metering chamber. And the rapid plugging head and the current transformer are concentrically installed, and the rapid plugging head is used for realizing rapid plugging type electrical connection between a three-phase power supply and a high-voltage component in the gas tank. According to the invention, the energy management requirement of a temporary power supply for line maintenance is met, and power failure loss can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to an electric quantity metering device. BACKGROUND

[0002] In recent years, with the continuous growth of social electricity consumption and the promotion of power distribution network upgrading, users' requirements for power supply quality are increasing. When the power supply bureau carries out maintenance and construction, leading to user power outage, the temporary access of mobile power generation vehicles and other emergency power supplies to the customer end distribution network (such as through bypass power supply or power generation vehicle direct power generation) has become one of the effective measures to ensure user electricity consumption.

[0003] In this process, the electricity consumption of high-supply high-metering and high-supply low-metering users needs to be accurately and timely recorded and summarized. This data can effectively supplement and correct the accounting and control of line maintenance costs. However, there are obvious technical pain points in the current emergency power supply metering field: on the one hand, existing emergency power generation vehicles generally lack special metering devices and cannot directly and accurately count power generation; on the other hand, even if a traditional emergency power supply metering table access scheme is used, it has the problems of large workload, many auxiliary equipment required, and long time-consuming when accessing and exiting, which not only seriously affects the normal production and life electricity consumption of users, but also causes economic losses to power supply companies and damages their corporate image in the public. Especially for the medium-voltage power generation vehicle power supply scene, although the current high-supply high-metering method meets the metering demand, the specific operation can only be realized by the following two methods, and both have defects: Accessing the power generation vehicle to the user's original medium-voltage metering cabinet: when operating, the original incoming line cabinet cable needs to be removed first, and then the power generation vehicle cable is connected, so that the power generation vehicle output current flows through the original metering cabinet to balance power supply and metering; Additional configuration of an independent medium-voltage metering cabinet: let the power generation vehicle output current flow through the newly added metering cabinet before supplying power to the user, but because the medium-voltage metering cabinet is large in size, additional vehicles need to be arranged for transportation each time.

[0004] The common problem of the above-mentioned emergency power supply metering related schemes (including no special device, traditional metering table access, and two high-supply high-metering methods in medium-voltage scenarios) is that they all greatly increase the workload of operating personnel and prolong the user power outage time, thereby expanding the economic losses caused to users due to power outage. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an accurate, reliable, efficient, and safe electric quantity metering device to meet the energy management needs of temporary power supply access and exit in line maintenance scenarios.

[0006] To solve the above technical problems, the present application provides an electric quantity metering device, which comprises a gas tank, a metering chamber arranged on the gas tank, quick plug-in heads installed on both sides of the gas tank, and wheels installed at the bottom of the gas tank. The gas box is filled with insulating gas and has a current transformer and a voltage transformer connected to the high-voltage busbar via a connector; the current and voltage signals output by the current transformer and the voltage transformer are transmitted to the metering chamber. The quick-connect head is installed concentrically with the current transformer to enable quick-connect electrical connection between the three-phase power supply and the high-voltage components inside the gas box.

[0007] Preferably, the quick-connect head specifically includes a connector, a self-locking sleeve, a sealing ring, an insulating sleeve, and a conductive rod; The connector is electrically connected to the front end of the conductive rod, and the rear end of the conductive rod is electrically connected to the connector inside the gas box; the self-locking sleeve is fitted between the connector and the sealing ring; the sealing ring is positioned between the self-locking sleeve and the insulating sleeve to achieve a seal between the quick-connect head and the gas box; the insulating sleeve wraps around the outer periphery of the conductive rod.

[0008] Preferably, the self-locking ferrule adopts a ball-bearing ferrule self-locking structure, the insulating sleeve is made of epoxy resin, the conductive rod is made of copper, and the sealing ring is made of silicone.

[0009] Preferably, the creepage distance from the conductor of the conductive rod to the mounting surface is 80mm, and the insertion and extraction force of the quick-release head is less than or equal to 200N.

[0010] Preferably, the insulating gas filled in the gas box is sulfur hexafluoride gas, and a pressure relief valve is provided on the back of the gas box; the pressure relief valve includes a pressure relief flange, a second sealing ring, a guide ring, and a thin plate; the pressure relief flange has a circular structure, the thin plate is placed on the inner step of the pressure relief flange, the second sealing ring is installed on the upper side of the thin plate and its surface is slightly higher than the end face of the pressure relief flange, and the guide ring and the pressure relief flange form a sealing groove to limit the second sealing ring.

[0011] Preferably, a pressure relief baffle is installed on the outside of the pressure relief valve; the pressure relief baffle has a structure that is closed from left to right and open from top to bottom, including a blocking plate and a side plate, and the blocking plate has a square structure.

[0012] Preferably, the metering chamber is equipped with a control board, a smart energy meter, a barometer, and a display screen; the control board is used to receive and preprocess the current and voltage signals output by the current transformer and voltage transformer before transmitting them to the smart energy meter; the smart energy meter is used to process the current and voltage signals to measure electrical energy; the barometer is used to monitor the pressure of the insulating gas in the gas tank; and the display screen is used to display the electrical energy data and the pressure status of the gas tank.

[0013] Preferably, the voltage transformer adopts a resistive voltage divider design, and the surfaces of the current transformer and the voltage transformer are insulated with high-performance epoxy resin casting.

[0014] Preferably, the phase spacing of the high-voltage busbars inside the gas box is 60mm, and the insulation distance between the high-voltage busbars and the gas box shell is 70mm.

[0015] Preferably, an air inlet is provided on one side of the bottom of the air box, which is connected to the inside of the air box, for filling the air box with insulating gas; a grounding stake is provided on the other side of the bottom of the air box for grounding protection of the device.

[0016] The implementation of this invention offers the following advantages: Compared to traditional medium-voltage metering cabinets, this invention, on the one hand, utilizes gas insulation combined with highly integrated voltage and current transformers, significantly reducing the size and weight of the device, facilitating vehicle transport and on-site operations; on the other hand, the quick-connect design of the incoming and outgoing lines replaces the traditional copper lug crimping, simplifying operation and enabling rapid connection, greatly improving work efficiency and shortening power outage time. Simultaneously, its fully insulated design ensures an IP68 waterproof rating after cable connection, effectively protecting the personal safety of operators; furthermore, the device also features overload, over-temperature, and poor grounding warning functions, ensuring operational safety from multiple dimensions. In summary, this invention not only meets the energy management needs of temporary power supplies for line maintenance but also reduces power outage losses. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of an electricity metering device according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of an electricity metering device according to an embodiment of the present invention.

[0020] Figure 3 This is a side view of the quick-plug head in an embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the quick-plug head in an embodiment of the present invention.

[0022] Figure 5 This is another three-dimensional structural diagram of the quick-plug head in an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of the pressure relief valve in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the assembly structure of the pressure relief valve and the pressure relief baffle in an embodiment of the present invention.

[0025] The attached diagram is labeled as follows: 1. Gas box; 11. Lifting ring; 12. Inflation port; 13. Grounding stake; 2. Metering chamber; 21. Control panel; 22. Electricity meter; 23. Pressure gauge; 24. Display screen; 3. Quick-connect plug; 31. Connector; 32. Self-locking sleeve; 33. First sealing ring; 34. Insulating sleeve; 35. Conductive rod; 4. Wheel; 5. Current transformer; 6. Voltage transformer; 7. Connector; 8. Pressure relief valve; 80. Opening; 81. Pressure relief flange; 82. Second sealing ring; 83. Guide ring; 84. Thin plate; 9. Pressure relief baffle; 91. Blocking plate; 92. Side plate. Detailed Implementation

[0026] The following descriptions of various embodiments are based on the accompanying drawings, illustrating specific embodiments in which the present invention can be implemented. In the description of the present invention, it should be understood that the terms "longitudinal," "length," "circumferential," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] Please refer to the following at the same time Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an electricity metering device, including an air box 1, a metering chamber 2 disposed on the air box 1, quick-connect plugs 3 installed on both sides of the air box 1, and wheels 4 installed at the bottom of the air box 1; The gas box 1 is filled with insulating gas and has a current transformer 5 and a voltage transformer 6 connected to the high-voltage busbar via a connector 7; the current and voltage signals output by the current transformer 5 and the voltage transformer 6 are transmitted to the metering chamber 2. The quick-connect head 3 is installed concentrically with the current transformer 5 to achieve a quick-connect electrical connection between the three-phase power supply and the high-voltage components inside the gas box 1.

[0028] Specifically, the gas box 1 and the metering chamber 2 are arranged vertically, with the gas box 1 providing lower support for the metering chamber 2. The gas box 1 adopts a sealed design with a protection level of IP68; it is filled with SF6 gas with excellent insulation properties to isolate the high-voltage part from the external environment and prevent the external environment from affecting the internal high-voltage components (current transformer 5, voltage transformer 6, connector 7, etc.).

[0029] The current transformer 5 can be either a three-phase integrated unit or a single-phase unit, both with high-performance epoxy resin casting insulation on their surfaces. The voltage transformer 6 employs a resistance voltage divider design, significantly reducing the size and weight of the equipment compared to the tens of kilograms of traditional electromagnetic transformers. The voltage transformer 6 is connected to the high-voltage busbar via connector 7 to measure the system voltage; the current transformer 5 is concentrically mounted with the quick-connect connector 3 to measure the system current. As an example, the phase spacing of the high-voltage busbar is 60mm, and the insulation distance between the high-voltage busbar and the gas tank 1 shell is 70mm.

[0030] Lifting rings 11 are provided on the top left and right sides of the gas tank 1 for hoisting operations of the power metering device in this embodiment of the invention. This facilitates the handling, relocation, or installation of the entire power metering device using lifting equipment, adapting to the needs of mobile use scenarios. An inflation port 12 is provided on one side of the bottom of the gas tank 1, communicating with the interior of the gas tank 1, for filling the gas tank 1 with SF6 gas with excellent insulating properties, providing an insulating environment for the high-voltage components inside the gas tank. A grounding stake 13 is provided on the other side of the bottom of the gas tank 1 for grounding protection of the device, conducting any leakage current or induced charge that may be generated by the high-voltage components inside the gas tank 1 to the ground, preventing the device casing from becoming electrified, and ensuring the safety of operators and the stable operation of the equipment.

[0031] Metering room 2 is the core area for the control, power metering, and operational status monitoring of the device. It contains a control board 21, a smart power meter 22, a pressure gauge 23, and a display screen 24. Through their coordinated operation, they realize the functions of power data processing, gas tank status monitoring, and information visualization. The specific structure, installation method, and function of each component are as follows: The control board 21 adopts a PCB circuit board structure and is fixedly installed inside the metering chamber 2 near the top of the gas box 1 by bolts. This facilitates short-path wiring with the sealed aviation connector leading out from the gas box 1 and other components in the metering chamber 2, reducing signal transmission loss. One end of the control board 21 is connected to the sealed aviation connector via a wire, receiving the raw current and voltage analog signals transmitted from the two current transformers, and transmitting the pre-processed signals (such as filtering and voltage stabilization) to the smart energy meter 22. The other end establishes electrical connections with the smart energy meter 22, the pressure gauge 23, and the display screen 24, respectively, to realize bidirectional data transmission between the components (such as receiving the metering data from the smart energy meter 22 and the pressure monitoring data from the pressure gauge 23, and then sending the information to be displayed to the display screen 24).

[0032] The control board 21 can also realize operation status coordination and protection functions. It monitors the stability of the working voltage and current signal of the smart energy meter 22 in real time. When an abnormal signal is detected (such as overcurrent or overvoltage), it can trigger an early warning signal through the built-in protection circuit (indirectly fed back to the display screen 24 to display a fault prompt); at the same time, it receives the pressure data of the pressure gauge 23. If the SF6 pressure in the gas tank 1 is lower than the preset safety threshold, it can assist in triggering a pressure abnormality reminder, prompting the operator to replenish the gas through the air inlet 12.

[0033] The smart energy meter 22 is the core metering component of the device. It adopts a digital meter structure that conforms to medium-voltage energy metering standards and is fixedly installed inside the metering chamber 2, adjacent to the control board 21, ensuring convenient and stable wire connection with the control board 21. The smart energy meter 22 receives pre-processed current and voltage signals transmitted from the control board 21 via wires. The internally integrated metering chip samples and performs analog-to-digital conversion (converting analog signals to digital signals) on both signals. Based on a preset energy metering algorithm (such as the active power integration method), it calculates real-time active power and cumulative energy consumption (unit: kWh), while simultaneously storing historical metering data (supporting at least 30 days of daily energy consumption records). The smart energy meter 22 has a built-in data interface compatible with the power supply department's metering system. Operators can connect to the interface via a dedicated data cable to read the cumulative energy data stored in the smart energy meter 22, providing accurate data for the power supply department to calculate user energy consumption during line maintenance and generate billing statements.

[0034] The pressure gauge 23 is a monitoring component for the SF6 gas pressure inside the gas box 1. Its detection end is connected to the inside of the gas box 1 through a metal conduit resistant to SF6 corrosion. It can collect the absolute pressure value of the SF6 gas inside the gas box 1 in real time and display the current pressure value directly through the deflection of the dial pointer or the display screen 24.

[0035] Display screen 24 is the information visualization output component of the device. It adopts a high-definition LCD screen or LED screen structure, which makes it convenient for operators to obtain the core measurement data and the gas box status data at the same time.

[0036] The quick-connect head 3 is arranged in three layers (top, middle, and bottom) on both sides of the air box 1. Its internal structure uses copper for airflow guidance, and its external structure is insulated with epoxy resin. It is sealed to the air box 1 via a silicone sealing ring and secured with bolts. Located on one side of the air box 1 (e.g., Figure 1 , 2 The quick-connect connector 3 (shown on the left side of gas box 1) serves as the connection conductor for the three-phase power input of gas box 1, i.e., the quick-input interface; located on the other side of gas box 1 (as shown on the left side of gas box 1) Figure 1 , 2 The quick-connect head 3 (shown on the right side of the gas box 1) serves as the connection conductor for the three-phase power output gas box 1, i.e., the quick output interface.

[0037] Specifically, please also refer to Figures 3-5 As shown, the quick-connect head 3 specifically includes a connector 31, a self-locking sleeve 32, a first sealing ring 33, an insulating sleeve 34, and a conductive rod 35. Through the electrical energy conduction of the connector 31 and the conductive rod 35, the quick fixation of the self-locking sleeve 32, the sealing protection of the first sealing ring 33, and the insulation isolation of the insulating sleeve 34, the quick connection / disconnection of the three-phase power supply is realized, while ensuring the sealing and insulation performance of the gas box 1.

[0038] The connector 31 is located at the front end of the quick-connect head 3 (facing the outside of the gas box 1) and has an interface structure adapted to the external three-phase power plug. Its interior is electrically connected to the front end of the conductive rod 35 by welding or crimping, and is used to receive the electrical energy input from the external three-phase power supply, providing an entry point for the power path to the high-voltage components (such as current transformer 5, voltage transformer 6, etc.) inside the gas box 1.

[0039] The self-locking sleeve 32 is fitted onto the outer periphery between the connector 31 and the first sealing ring 33. As an example, the self-locking sleeve 32 employs a ball-bearing sleeve self-locking structure. When an external three-phase power plug is inserted into the connector 31, the balls inside the self-locking sleeve 32 engage with the slots of the plug / connector, quickly achieving self-locking fixation between the plug and connector. When pulled out, the self-locking is released by applying reverse force. This structure ensures the stability of the connection during insertion and removal, and the insertion / removal force is ≤200N, facilitating quick power connection or disconnection by operators and significantly shortening the temporary power switching time.

[0040] The first sealing ring 33 is an annular structure and is located at the connection between the self-locking sleeve 32 and the insulating sleeve 34. It is made of silicone. During assembly, the first sealing ring 33 fits tightly against the housing of the quick-connect head 3 and the insulating sleeve 34, forming a sealing layer between the quick-connect head 3 and the mounting surface of the gas box 1. This prevents the leakage of SF6 gas inside the gas box 1 and blocks moisture, dust, and other contaminants from the external environment from entering the gas box 1, ensuring that the gas box 1 achieves an IP68 sealing protection level and providing a stable insulation environment for the internal high-voltage components.

[0041] The insulating sleeve 34, made of epoxy resin, wraps around the outer periphery of the conductive rod 35, extending rearward from the location of the first sealing ring 33 into the interior of the gas box 1. Utilizing the excellent insulating properties of epoxy resin, the insulating sleeve 34 electrically isolates the conductive rod 35 from the metal housing of the quick-connect head 3 and other components inside the gas box 1, ensuring that there is no risk of leakage when high-voltage electricity is transmitted within the conductive rod 35; at the same time, it ensures that the creepage distance from the conductor of the conductive rod 35 to the mounting surface reaches 80mm, meeting the insulation creepage requirements of medium-voltage electrical equipment.

[0042] The conductive rod 35 is made of copper and is arranged along the central axis of the quick-connect head 3. Its front end is electrically connected to the connector 31, and its rear end extends into the gas box 1 and is electrically connected to the connector 7 (a copper component used to connect the high-voltage busbar or voltage transformer) inside the gas box 1, so as to realize the conduction of electrical energy from the external three-phase power supply to the high-voltage components inside the gas box 1.

[0043] Please refer to again Figure 6 As shown, in the power metering device of this embodiment, a pressure relief valve 8 is also provided on the back of the gas tank 1, which is used to quickly relieve pressure when the internal pressure of the gas tank 1 rises abnormally, while ensuring the sealing performance under normal operating conditions. The pressure relief valve 8 includes a pressure relief flange 81, a second sealing ring 82, a guide ring 83, and a thin plate 84.

[0044] The pressure relief flange 81 is the main supporting component of the pressure relief valve 8. It is made of stainless steel, has a circular structure, and an outer diameter ranging from 150mm to 200mm. The pressure relief flange 81 is fastened to the pressure relief hole on the back of the air box 1 by fasteners (such as bolts). It serves as the mounting base for the entire pressure relief valve 8, provides a supporting carrier for the second sealing ring 82, guide ring 83, and thin plate 84, and ensures the structural strength and stability of the connection with the air box 1.

[0045] The thin plate 84 is made of stainless steel with a thickness of 0.2mm to 0.3mm and is placed horizontally on the step inside the pressure relief flange 81. Under normal operating conditions, the thin plate 84 bears the pressure of the SF6 gas inside the gas box 1 and remains intact to block the communication between the inside and outside of the gas box 1. When abnormal high pressure is generated inside the gas box 1 due to a fault (such as arc discharge or abnormal heating of components causing rapid expansion of SF6 gas), the thin plate 84 will rupture because the pressure it bears exceeds its mechanical limit, allowing the high-pressure gas inside the gas box 1 to be quickly released to the outside, preventing more serious damage to the gas box 1 due to excessive pressure, and protecting the operators from high-pressure hazards.

[0046] The second sealing ring 82 is an annular sealing component, installed on the upper side of the thin plate 84. After assembly, the surface of the second sealing ring 82 is slightly higher than the end face of the pressure relief flange 81. When the pressure relief valve 8 is fastened to the pressure relief hole of the gas box 1 through the pressure relief flange 81, the second sealing ring 82 will be squeezed and deformed, thereby forming a sealing layer between the mating surfaces of the pressure relief flange 81 and the pressure relief hole of the gas box 1, realizing bidirectional sealing of the pressure relief hole of the gas box 1—preventing the leakage of SF6 gas inside the gas box 1 under normal operating conditions, and blocking external moisture, dust, etc. from entering the interior of the gas box 1, thus ensuring the sealing performance of the gas box 1.

[0047] The guide ring 83, made of aluminum alloy, is installed on the upper side of the second sealing ring 82, forming a sealing groove structure together with the pressure relief flange 81. This sealing groove limits the displacement of the second sealing ring 82 during installation or under pressure, ensuring that the second sealing ring 82 is always in the preset sealing position, thereby stably ensuring the airtightness of the pressure relief valve 8 and preventing sealing failure due to displacement of the second sealing ring 82.

[0048] For example Figure 7 As shown, a pressure relief baffle 9 is also installed on the outside of the pressure relief valve 8 to guide the flow of hot air when the air box 1 malfunctions and releases pressure, thus protecting the safety of the operators. The pressure relief baffle 9 is a frame structure that is closed on both sides and extends vertically, including a baffle plate 91 and a side plate 92. It is fastened to the outside of the pressure relief valve 8 with fasteners (such as bolts and nuts) to form a stable connection with the back structure of the air box 1. The baffle plate 91 is made of 3mm thick stainless steel and has a square structure with a side length ranging from 180mm to 250mm (which can be adjusted according to the size of the air box 1 and the specifications of the pressure relief valve 8). It serves as the main component for blocking hot air. The side plate 92 is vertically connected to both sides of the baffle plate 91, and together with the baffle plate 91, they enclose the left and right sides of the pressure relief baffle 9, leaving only the vertical through opening 80.

[0049] When a malfunction occurs inside the gas chamber 1 (such as arc discharge or abnormal heating of components causing a sharp increase in internal pressure), the pressure relief valve 8 is activated (the internal thin plate 84 breaks, achieving pressure relief). High-pressure hot air inside the gas chamber 1 is released outwards through the pressure relief valve 8. At this time, the pressure relief baffle 9, through its left-right enclosed and top-bottom penetrating structure, guides and restricts the released hot air: the design of the side plates 92, which enclose the left and right sides, prevents the hot air from diffusing towards the front of the gas chamber 1 (the direction where operators usually stay); and the top-bottom penetrating opening 80 guides the hot air to move mainly in the vertical direction (upward or downward discharge), thereby preventing high-temperature, high-pressure gas from being directly sprayed onto the operators directly in front of the gas chamber, effectively reducing the risk of injury and ensuring operational safety.

[0050] The air box 1 of this invention is designed with a pressure of 0.07 MPa. The pressure relief valve 8 does not operate when the pressure is 1.3 times the design pressure, but can reliably relieve pressure when it is 2.3 times the design pressure, thereby fully ensuring the safety of the equipment and operators.

[0051] The bottom of the air box 1 is equipped with four wheels 4, specifically outward-facing wheels, to facilitate the movement of the device.

[0052] As a further improvement of this invention, a temperature sensor is added to the connection between the connector 7 and the quick-connect head 3 inside the gas box 1. The temperature value is received by the wireless processor and sent to the corresponding instrument, which can realize real-time monitoring of the temperature rise inside the gas box 1 and prevent safety accidents that may be caused by excessive temperature rise.

[0053] The power metering device of this invention is a medium- and high-voltage power equipment. As an example, its rated voltage is 10kV, rated current is 400A, and its external dimensions are length × width × height = 500 × 250 × 600 (mm), with a weight of less than 40kg. Because it uses SF6, a good insulating gas, as the main insulating medium, it can achieve miniaturization and high safety performance.

[0054] Compared with existing technologies, the beneficial effects of this invention are as follows: Firstly, the invention employs gas insulation combined with highly integrated voltage and current transformers, greatly reducing the size and weight of the device, facilitating vehicle transport and on-site operations. Secondly, the quick-connect design of the incoming and outgoing lines replaces the traditional copper lug crimping, simplifying operation and enabling rapid connection, significantly improving work efficiency and shortening power outage time. Simultaneously, its fully insulated design ensures an IP68 waterproof rating after cable connection, effectively protecting the personal safety of operators. Furthermore, the device also features overload, over-temperature, and poor grounding warning functions, ensuring operational safety from multiple dimensions. In summary, this invention not only meets the energy management needs of temporary power supplies for line maintenance but also reduces power outage losses.

[0055] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A power metering device, characterized in that, It includes an air box, a metering chamber disposed on the air box, quick-connect plugs mounted on both sides of the air box, and wheels mounted on the bottom of the air box; The gas box is filled with insulating gas and has a current transformer and a voltage transformer connected to the high-voltage busbar via a connector; the current and voltage signals output by the current transformer and the voltage transformer are transmitted to the metering chamber. The quick-connect plug is installed concentrically with the current transformer to enable quick-connect electrical connection between the three-phase power supply and the high-voltage components inside the gas box.

2. The power metering device according to claim 1, characterized in that, The quick-connect head specifically includes a connector, a self-locking sleeve, a sealing ring, an insulating sleeve, and a conductive rod; The connector is electrically connected to the front end of the conductive rod, and the rear end of the conductive rod is electrically connected to the connector inside the gas box; the self-locking sleeve is fitted between the connector and the sealing ring; the sealing ring is positioned between the self-locking sleeve and the insulating sleeve to achieve a seal between the quick-connect head and the gas box; the insulating sleeve wraps around the outer periphery of the conductive rod.

3. The power metering device according to claim 2, characterized in that, The self-locking ferrule adopts a ball-bearing ferrule self-locking structure, the insulating sleeve is made of epoxy resin, the conductive rod is made of copper, and the sealing ring is made of silicone.

4. The power metering device according to claim 2, characterized in that, The creepage distance from the conductor of the conductive rod to the mounting surface is 80mm, and the insertion and extraction force of the quick-release head is less than or equal to 200N.

5. The power metering device according to claim 1, characterized in that, The gas box is filled with sulfur hexafluoride gas as insulating gas, and a pressure relief valve is provided on the back of the gas box. The pressure relief valve includes a pressure relief flange, a second sealing ring, a guide ring, and a thin plate. The pressure relief flange has a circular structure, and the thin plate is placed on the inner step of the pressure relief flange. The second sealing ring is installed on the upper side of the thin plate and its surface is slightly higher than the end face of the pressure relief flange. The guide ring and the pressure relief flange form a sealing groove to limit the second sealing ring.

6. The power metering device according to claim 5, characterized in that, A pressure relief baffle is installed on the outside of the pressure relief valve; the pressure relief baffle has a structure that is closed from left to right and open from top to bottom, including a blocking plate and a side plate, and the blocking plate has a square structure.

7. The power metering device according to claim 1, characterized in that, The metering room is equipped with a control board, a smart energy meter, a barometer, and a display screen; the control board is used to receive and preprocess the current and voltage signals output by the current transformer and voltage transformer before transmitting them to the smart energy meter; the smart energy meter is used to process the current and voltage signals to measure electrical energy. The pressure gauge is used to monitor the pressure of the insulating gas inside the gas tank; the display screen is used to display electrical energy data and the pressure status of the gas tank.

8. The power metering device according to claim 7, characterized in that, The voltage transformer adopts a resistive voltage divider design, and the surfaces of the current transformer and the voltage transformer are insulated with high-performance epoxy resin casting.

9. The power metering device according to claim 1, characterized in that, The phase spacing of the high-voltage busbars inside the gas box is 60mm, and the insulation distance between the high-voltage busbars and the gas box shell is 70mm.

10. The power metering device according to claim 1, characterized in that, An air inlet is provided on one side of the bottom of the air box, which is connected to the inside of the air box and is used to fill the air box with insulating gas; a grounding stake is provided on the other side of the bottom of the air box for grounding protection of the device.

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