Modular integrated smart measurement protection device

Abstract

The application provides a modular integrated intelligent measurement protection device, and relates to the field of smart grids.The modular integrated intelligent measurement protection device comprises a base, a conductive connector fixedly installed in the base, an arc-shaped conductive plate arranged on the outer side of the connector, an insulating sleeve fixedly embedded on the outer side of the conductive plate, an insulating column fixedly installed on the base, and a conductive column fixedly installed on the insulating column.The modular integrated intelligent measurement protection device, through the synergistic effect of the bimetallic strip, the conductive rod and the magnet, realizes overload gradual current limiting and complete power-off after threshold under the overload working condition of the measurement device, avoids the distortion of measurement data and the aging of components caused by overload, prevents the burning of the sampling circuit and the failure of the measurement function, guarantees the measurement accuracy and the service life of the equipment, and through the cooperation of the electromagnetic coil, the clamping block and the torsional spring, the circuit is quickly cut off under overvoltage, overvoltage breakdown of the core device is avoided, and permanent damage of the equipment is prevented.

Description

Technical Field

[0001] This invention relates to the field of smart grids, specifically to a modular integrated smart measurement and protection device. Background Technology

[0002] With the continuous development of smart grids and power electronics technologies, electrical parameter measurement, intelligent monitoring terminals, and power distribution protection equipment have become important components of electronic information and intelligent equipment. In intelligent power distribution systems, modular integrated intelligent measurement devices, as key equipment integrating data acquisition, status monitoring, and fault protection, are widely used in power distribution systems. Their measurement accuracy and operational reliability directly affect the stable operation of the power distribution system. Against the backdrop of the rapid development of the core electronics industry, intelligent electronic equipment, power electronic devices, and intelligent sensing and control are ushering in large-scale applications. Various power distribution scenarios have placed higher demands on the accuracy of electrical parameter measurement and the safety of equipment operation. The intelligent measurement device is the core module responsible for collecting and calculating electrical data, similar to a smart meter or power distribution monitoring unit. It acquires loop signals through current and voltage sampling elements, processes them through internal metering chips, and calculates and outputs parameters such as voltage, current, power, and energy in real time, realizing intelligent monitoring of the power distribution operation status.

[0003] In actual operation, overload and overvoltage are the two most frequent abnormal conditions for intelligent measuring devices. Under overload conditions, the circuit current continuously exceeds the rated range. The current flows through the internal sampling circuit and power supply module of the measuring device, generating a cumulative temperature rise. Long-term overheating will accelerate the aging of internal electrolytic capacitors, chips, and power electronic components, reducing the service life of the device. Under overvoltage conditions, the abnormal rise in grid voltage will be directly applied to the power input terminal of the measuring device, exceeding the voltage withstand range of the internal power electronic components. This can easily break down the voltage regulator chip, metering MCU, and voltage divider sampling circuit, causing permanent damage to the equipment. Therefore, there is an urgent need for a protection device that can adapt to the usage scenarios of the measuring device and assist the measuring device in measurement under overload and overvoltage conditions, so as to improve the overall protection level and operational stability of the power distribution switch control equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a modular integrated intelligent measurement protection device, which solves the problems of long-term overheating and easy damage to internal components of the measuring device under overload and overvoltage conditions.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a modular integrated intelligent measurement and protection device, comprising a base, a conductive connector fixedly installed inside the base, an arc-shaped conductive plate provided on the outside of the connector, an insulating sleeve fixedly embedded on the outside of the conductive plate, an insulating column fixedly installed on the base, a conductive column fixedly installed on the insulating column, a bimetallic sheet fixedly connected to the outside of the conductive column, and a conductive rod for contacting the conductive plate rotatably installed on the outside of the insulating column; In the initial state, the conductive post, bimetallic strip, conductive rod, conductive plate, and connector are connected in series in the circuit of the measuring device. When overloaded, the bimetallic strip controls the conductive rod to rotate around the insulating post as the axis through the connecting rod.

[0006] An electromagnetic coil and a locking block are also installed on the base. The electromagnetic coil is used to connect in parallel to the power supply terminal of the measuring device, and the locking block is used to limit the conductive plate. When overvoltage occurs, the iron core inside the electromagnetic coil attracts the locking block and releases the locking block from the conductive plate, causing the conductive plate to rotate through the torsion spring.

[0007] Preferably, one end of both the connector and the conductive post is fixedly connected to a terminal block, the terminal block of which is used to connect an external lead wire, which is then connected in series with the power supply circuit of the measuring device.

[0008] Preferably, the conductive plate and the connector are rotatably connected and in contact with each other. An insulating sheet is fixedly connected to one end of the conductive plate and one end of the connector, and a torsion spring is fixedly installed between the two insulating sheets.

[0009] Preferably, the conductive rod includes a connecting ring, a conductive head, a telescopic rod A, and a telescopic rod B. The connecting ring is rotatably connected to the insulating column. The conductive head is installed at one end of the telescopic rod B. The connecting ring is fixedly installed between the telescopic rod A and the telescopic rod B. The conductive head is fixedly connected to the telescopic end of the telescopic rod B. The conductive head is adapted to the conductive plate, and the two are in contact with each other.

[0010] Preferably, the length of the telescopic rod A is greater than the length of the telescopic rod B.

[0011] Preferably, a magnet is fixedly connected to one end of the insulating sleeve, and the magnet is used to attract the conductive head when the conductive head approaches the magnet.

[0012] Preferably, both the fixed end and the telescopic end of the telescopic rod B are fixedly connected to an insulating plate, and a spring is fixedly connected between the two insulating plates.

[0013] Preferably, the connecting rod includes a conductive rotating head A and a rotating head B, which are in contact with each other and are rotatably connected. The rotating head A and the rotating head B are respectively fixedly connected to one end of the bimetallic strip and the telescopic rod A.

[0014] Preferably, the bimetallic strip is composed of a brass layer and an Invar layer. Under overload conditions, the bimetallic strip is heated and bent and deformed towards the side with the lower coefficient of expansion, and the conductive rod is driven to rotate through the connecting rod.

[0015] Preferably, one end of the conductive plate has a limiting groove, one end of the locking block has a protrusion that fits the limiting groove, and the protrusion of the locking block is made of insulating material. A fixing block is fixedly connected to the base, and an elastic sheet is fixedly connected to the fixing block. The free end of the elastic sheet is fixedly connected to the locking block.

[0016] Compared with existing technologies, this invention has the following advantages: Through the synergistic effect of the bimetallic strip, conductive rod, and magnet, under overload conditions of the measuring device, it achieves gradual overload current limiting and thresholding before complete power cut-off, avoiding measurement data distortion and component aging caused by overload, preventing sampling circuit burnout and measurement function failure, ensuring measurement accuracy and equipment lifespan. Utilizing the cooperation of electromagnetic coil, locking block, and torsion spring, it quickly cuts off the circuit during overvoltage, preventing overvoltage breakdown of core components and permanent equipment damage. At the same time, it avoids the problems of operating point shift and data jump caused by long-term high voltage. The combination of mechanical structure with thermal and electromagnetic induction provides more stable protection and features graded overload response (the smaller the overload, the larger the effective conductive length, avoiding false tripping due to slight overload), adapting to complex operating conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the conductive plate, bimetallic sheet, and conductive rod of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a cross-sectional view of the bimetallic sheet and conductive rod of the present invention from the front view. Figure 5 This is a schematic diagram of the conductive rod of the present invention; Figure 6 This is a partial cross-sectional view of the conductive plate of the present invention; Figure 7 This is an exploded view of the conductive plate and insulating sleeve of the present invention.

[0018] The components are as follows: 1. Base; 2. Connector; 3. Conductive plate; 4. Insulating sleeve; 5. Insulating column; 6. Conductive column; 7. Bimetallic strip; 8. Conductive rod; 801. Connecting ring; 802. Conductive head; 803. Telescopic rod A; 804. Telescopic rod B; 9. Electromagnetic coil; 10. Locking block; 11. Terminal; 12. Insulating sheet; 13. Magnet; 14. Insulating plate; 15. Connecting rod; 16. Limiting groove; 17. Elastic sheet. Detailed Implementation

[0019] like Figures 1-7 As shown, a modular integrated intelligent measurement and protection device includes a base 1, a conductive connector 2 fixedly installed inside the base 1, an arc-shaped conductive plate 3 on the outside of the connector 2, an insulating sleeve 4 fixedly embedded on the outside of the conductive plate 3, an insulating post 5 fixedly installed on the base 1, a conductive post 6 fixedly installed on the insulating post 5, a bimetallic strip 7 fixedly connected to the outside of the conductive post 6, and a conductive rod 8 for contacting the conductive plate 3 rotatably installed on the outside of the insulating post 5. The bimetallic strip 7 is composed of two metal materials with different coefficients of thermal expansion, a brass layer and an Invar layer. Under overload conditions, the bimetallic strip 7 is heated and bent and deformed towards the side with the lower coefficient of thermal expansion, and drives the conductive rod 8 to rotate through the connecting rod 15.

[0020] Both connector 2 and conductive post 6 are fixedly connected to one end of a terminal 11. The terminal of terminal 11 is used to connect an external lead wire, which is connected in series to the power supply circuit of the measuring device. By setting terminal 11 on connector 2 and conductive post 6, it is convenient to connect the protection device in series to the power supply circuit of the measuring device, so that conductive post 6, bimetallic strip 7, conductive rod 8, conductive plate 3 and connector 2 form a series conductive structure with the measuring device. Conductive plate 3 and connector 2 are rotatably connected and in contact with each other. One end of conductive plate 3 and one end of connector 2 are fixedly connected to an insulating sheet 12. A torsion spring is fixedly installed between the two insulating sheets 12. Conductive plate 3 and connector 2 are rotatably connected and cooperate with the torsion spring through the insulating sheet 12. In case of overvoltage, the spring force of the torsion spring can realize the rotation of conductive plate 3, so that conductive plate 3 automatically disengages from conductive head 802.

[0021] In the initial state, the conductive post 6, bimetallic strip 7, conductive rod 8, conductive plate 3, and connector 2 are connected in series in the circuit of the measuring device. When overloaded, the bimetallic strip 7 controls the conductive rod 8 to rotate around the insulating post 5 as the axis through the connecting rod 15.

[0022] An electromagnetic coil 9 and a locking block 10 are also installed on the base 1. The electromagnetic coil 9 is used to connect in parallel to the power supply terminal of the measuring device. The locking block 10 is used to limit the conductive plate 3. When overvoltage occurs, the iron core inside the electromagnetic coil 9 attracts the locking block 10 and releases the locking block 10 from the conductive plate 3. The conductive plate 3 rotates through a torsion spring. A limiting groove 16 is opened at one end of the conductive plate 3. One end of the locking block 10 has a protrusion that matches the limiting groove 16. The protrusion of the locking block 10 is made of insulating material. A fixing block is fixedly connected to the base 1. An elastic sheet 17 is fixedly connected to the fixing block. The free end of the elastic sheet 17 is fixedly connected to the locking block 10.

[0023] The conductive rod 8 includes a connecting ring 801, a conductive head 802, a telescopic rod A803, and a telescopic rod B804. The connecting ring 801 is rotatably connected to the insulating column 5. The conductive head 802 is installed at one end of the telescopic rod B804. The connecting ring 801 is fixedly installed between the telescopic rod A803 and the telescopic rod B804. The conductive head 802 is fixedly connected to the telescopic end of the telescopic rod B804. The conductive head 802 is compatible with the conductive plate 3, and the two are in contact with each other. The cross-section of the conductive head 802 is U-shaped. The U-shaped conductive head 802 has a stronger compatibility with the arc-shaped conductive plate 3, resulting in a larger contact area and lower contact resistance. The length of the telescopic rod A803 is greater than the length of the telescopic rod B804. Utilizing the lever principle, when the bimetallic strip 7 bends, it is easier for the telescopic rod B804 to drive the telescopic rod A803 to rotate. One end of the insulating sleeve 4... A magnet 13 is fixedly connected. When the conductive head 802 approaches the magnet 13, the magnet 13 attracts the conductive head 802, causing the conductive head 802 to completely detach from the conductive plate 3 and contact the conductive head 802 with the insulating sleeve 4. Both the fixed end and the telescopic end of the telescopic rod B804 are fixedly connected to the insulating plate 14. A spring is fixedly connected between the two insulating plates 14. The spring applies a force close to the conductive plate 3 to the telescopic end of the telescopic rod B804, so that the conductive head 802 is in close contact with the conductive plate 3. This allows the conductive head 802 to be attracted and positioned when it moves to the position where it is about to disconnect. The connecting rod 15 includes a conductive rotating head A and a rotating head B, which are in contact with each other and are rotatably connected. The rotating head A and the rotating head B are fixedly connected to the bimetallic strip 7 and one end of the telescopic rod A803, respectively.

[0024] By connecting the conductive post 6, bimetallic strip 7, conductive rod 8, conductive plate 3, and connector 2 in series to the circuit of the measuring device, thermal induction protection under overload conditions is achieved; at the same time, the electromagnetic coil 9, in conjunction with the locking block 10 and torsion spring, achieves rapid tripping under overvoltage conditions, enabling the device to have both overload protection and overvoltage protection functions. It has a high degree of structural integration and reliable operation, and can effectively assist the measuring device in avoiding damage under abnormal conditions.

[0025] This device serves as a protective structure for the measuring device, assisting its measurement operation. It provides overload protection by connecting in series to the measuring device's power supply circuit and overvoltage protection by connecting in parallel to the power supply terminal. Under abnormal operating conditions, it reliably disconnects dangerous circuits, preventing damage to the measuring device due to overload overheating or overvoltage breakdown, thus ensuring the device's lifespan. Intelligent measuring devices are primarily used in power distribution systems to collect and monitor voltage, current, and power parameters of power distribution lines in real time. They are crucial terminal devices for intelligent monitoring, data acquisition, and operational status management of power distribution systems. This protection device, as an auxiliary protection unit for the intelligent measuring device, is closely integrated with the power distribution system and the measuring device. It can be directly integrated into the power distribution circuit, distribution cabinet, or distribution terminal. In practical applications, the protection device connects to the power supply line of the power distribution system via a connector, forming a series and parallel connection with the intelligent measuring device. This ensures stable operation of the measuring device when the power distribution system is supplying power normally. When an overload or overvoltage abnormality occurs in the power distribution system, the protection device can quickly disconnect the abnormal circuit, preventing faulty electrical energy from directly impacting the measuring device, thereby ensuring the overall operational safety of the power distribution system.

[0026] In use, under normal operating conditions, the conductive post 6, bimetallic strip 7, conductive rod 8, conductive plate 3, and connector 2 form a series circuit, constituting a conductive loop with the measuring device. The spring on the telescopic rod B804 always applies a clamping force to the conductive head 802, ensuring that the U-shaped conductive head 802 and the arc-shaped conductive plate 3 are tightly fitted, resulting in a large contact area and low contact resistance. This ensures stable current transmission, avoids localized heating caused by poor contact, and ensures normal measurement and operation of the measuring device. The locking block 10 is inserted into the limiting groove 16 of the conductive plate 3 under the action of the elastic sheet 17, forming a mechanical limit on the conductive plate 3, keeping it in the conductive position and preventing malfunction.

[0027] Under overload conditions, when an overload occurs in the circuit, the current flows through the bimetallic strip 7, causing it to heat up. Since the bimetallic strip 7 is composed of two materials with significantly different coefficients of thermal expansion, brass and Invar, it will bend and deform uniformly towards the side with the lower coefficient of thermal expansion after being heated. This deformation is smoothly transmitted through the connecting rod 15 formed by rotating head A and rotating head B, pushing the conductive rod 8 to rotate slowly around the insulating column 5 as the axis. During this process, the conductive head 802 slides along the surface of the arc-shaped conductive plate 3 and does not immediately cut off the circuit. Instead, it changes the effective conductive length of the conductive plate 3 according to the degree of overload. The smaller the overload, the smaller the bending amplitude of the bimetallic strip 7, the shorter the movement distance of the conductive head 802, the larger the effective conductive length of the conductive plate 3, the smaller the change in circuit resistance, and the device maintains conduction, which can avoid frequent tripping due to slight overload and ensure continuous operation of the measuring device. The larger the overload, the larger the bending amplitude of the bimetallic strip 7, the longer the movement distance of the conductive head 802 along the conductive plate 3, the smaller the effective conductive length of the conductive plate 3, and the corresponding increase in circuit resistance, further limiting the continuous impact of excessive current on the measuring device and achieving progressive current limiting protection.

[0028] When the overload exceeds the safety threshold, the conductive head 802 slides to a position close to the insulating sleeve 4. The magnet 13 on the insulating sleeve 4 generates a magnetic attraction force on the conductive head 802, overcoming the spring pressure and firmly holding the conductive head 802 at the insulating sleeve 4, so that the conductive head 802 is completely separated from the conductive plate 3 and the circuit is completely disconnected. This method of first sliding to limit the current and then attracting to cut off the power not only avoids the malfunction of instantaneous overload, but also can quickly and completely cut off the power in the event of severe overload, preventing the measuring device from experiencing parameter drift, component aging, or even burning out the sampling circuit due to long-term overheating, thus protecting the measurement accuracy and equipment life.

[0029] Under overvoltage conditions, since the electromagnetic coil 9 is connected in parallel to the power supply terminal of the measuring device, when the mains voltage rises abnormally to the overvoltage threshold, the electromagnetic coil 9 generates sufficient electromagnetic attraction to attract the locking block 10 and overcome the force of the elastic sheet 17, causing the insulating protrusion of the locking block 10 to disengage from the limiting groove 16 of the conductive plate 3, releasing the limiting constraint on the conductive plate 3. Under the elastic action of the torsion spring, the conductive plate 3 rotates around the connector 2 and quickly separates from the conductive head 802, directly cutting off the power supply circuit. This avoids overvoltage breakdown of the voltage regulator chip, metering MCU, and voltage divider sampling circuit, preventing permanent damage to the measuring device. The limiting part adopts an insulating structure, which can avoid the risk of leakage and short circuit, further improving the reliability of protection.

[0030] It should be noted that overload and overvoltage are the two most frequent abnormal operating conditions in the actual operation of intelligent measuring devices, which have a long-term impact on equipment reliability and measurement accuracy. Common effects of overload on measuring devices include: the loop current continuously exceeding the rated range; current flowing through the internal sampling circuit and power supply module of the measuring device generates cumulative temperature rise, causing drift in the parameters of the sampling resistor, transformer, and core components, resulting in distortion of current and power measurement data; simultaneously, long-term overheating accelerates the aging of internal electrolytic capacitors, chips, and power electronic components, reducing the device's lifespan, and in severe cases, can burn out the sampling circuit, causing complete failure of the measurement function; under overvoltage conditions, an abnormal increase in mains voltage is directly applied to the power input terminal of the measuring device, exceeding the voltage withstand range of internal components. Overload and overvoltage conditions can easily damage the voltage regulator chip, metering MCU, and voltage divider sampling circuit of the measuring device, causing permanent damage. Even if the breakdown threshold is not reached, prolonged high voltage can cause the device's operating point to shift, resulting in data jumps and display abnormalities. This device, as an auxiliary protection unit for the measuring device, can respond promptly and perform protective actions when the measuring device circuit experiences overload or overvoltage abnormalities. By cutting off the abnormal power supply circuit, it prevents overload temperature rise and overvoltage impact from directly affecting the internal components of the measuring device, effectively preventing problems such as sampling circuit burnout, chip breakdown, and parameter drift. This helps the measuring device maintain a stable and reliable working state, ensuring measurement accuracy and service life, and improving the overall system safety of the measuring device under overvoltage and overload conditions.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular integrated intelligent measurement and protection device, characterized in that: Includes a base (1), a conductive connector (2) is fixedly installed inside the base (1), an arc-shaped conductive plate (3) is provided on the outside of the connector (2), an insulating sleeve (4) is fixedly embedded on the outside of the conductive plate (3), an insulating column (5) is fixedly installed on the base (1), a conductive column (6) is fixedly installed on the insulating column (5), a bimetallic strip (7) is fixedly connected to the outside of the conductive column (6), and a conductive rod (8) for contacting the conductive plate (3) is rotatably installed on the outside of the insulating column (5). In the initial state, the conductive post (6), bimetallic strip (7), conductive rod (8), conductive plate (3) and connector (2) are connected in series in the circuit of the measuring device. When overloaded, the bimetallic strip (7) controls the conductive rod (8) to rotate around the insulating post (5) through the connecting rod (15). An electromagnetic coil (9) and a locking block (10) are also installed on the base (1). The electromagnetic coil (9) is used to connect in parallel to the power supply terminal of the measuring device. The locking block (10) is used to limit the conductive plate (3). When there is overvoltage, the iron core inside the electromagnetic coil (9) attracts the locking block (10) and releases the locking block (10) from the conductive plate (3). The conductive plate (3) rotates through the torsion spring.

2. The modular integrated intelligent measurement and protection device according to claim 1, characterized in that: One end of the connector (2) and the conductive post (6) are fixedly connected to a terminal (11). The terminal of the terminal (11) is used to connect an external lead wire, which is connected in series to the power supply circuit of the measuring device.

3. The modular integrated intelligent measurement and protection device according to claim 1, characterized in that: The conductive plate (3) and the connector (2) are rotatably connected and in contact with each other. An insulating sheet (12) is fixedly connected to one end of the conductive plate (3) and one end of the connector (2). A torsion spring is fixedly installed between the two insulating sheets (12).

4. The modular integrated intelligent measurement and protection device according to claim 1, characterized in that: The conductive rod (8) includes a connecting ring (801), a conductive head (802), a telescopic rod A (803), and a telescopic rod B (804). The connecting ring (801) is rotatably connected to the insulating column (5). The conductive head (802) is installed at one end of the telescopic rod B (804). The connecting ring (801) is fixedly installed between the telescopic rod A (803) and the telescopic rod B (804). The conductive head (802) is fixedly connected to the telescopic end of the telescopic rod B (804). The conductive head (802) is adapted to the conductive plate (3), and the two are in contact with each other.

5. The modular integrated intelligent measurement and protection device according to claim 4, characterized in that: The length of telescopic rod A (803) is greater than the length of telescopic rod B (804).

6. The modular integrated intelligent measurement and protection device according to claim 4, characterized in that: One end of the insulating sleeve (4) is fixedly connected to a magnet (13). When the conductive head (802) approaches the magnet (13), the magnet (13) is used to attract the conductive head (802).

7. The modular integrated intelligent measurement and protection device according to claim 4, characterized in that: Both the fixed end and the telescopic end of the telescopic rod B (804) are fixedly connected to an insulating plate (14), and a spring is fixedly connected between the two insulating plates (14).

8. The modular integrated intelligent measurement and protection device according to claim 4, characterized in that: The connecting rod (15) includes a conductive rotating head A and a rotating head B, which are in contact with each other and are rotatably connected. The rotating head A and the rotating head B are respectively fixedly connected to one end of the bimetallic strip (7) and the telescopic rod A (803).

9. The modular integrated intelligent measurement and protection device according to claim 1, characterized in that: The bimetallic strip (7) is composed of a brass layer and an Invar layer. Under overload conditions, the bimetallic strip (7) is heated and bent and deformed to the side with a low coefficient of expansion, and drives the conductive rod (8) to rotate through the connecting rod (15).

10. The modular integrated intelligent measurement and protection device according to claim 1, characterized in that: One end of the conductive plate (3) is provided with a limiting groove (16), and one end of the card block (10) has a protrusion that adapts to the limiting groove (16). The protrusion of the card block (10) is made of insulating material. A fixing block is fixedly connected to the base (1), and an elastic sheet (17) is fixedly connected to the fixing block. The free end of the elastic sheet (17) is fixedly connected to the card block (10).

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