Voltage sensor for pole-mounted switch
By designing a voltage sensor for pole-mounted switches, employing an adjustable capacitor and a multi-stage filtering and amplification circuit, combined with a spiral seal and an insulating heat dissipation structure, the problems of large size, susceptibility to interference, and low measurement accuracy of traditional electromagnetic voltage transformers are solved, achieving high-precision voltage measurement and improved equipment stability.
Patent Information
- Application Number
- CN202520336889.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Traditional electromagnetic voltage transformers are large, heavy, and expensive. They are susceptible to electromagnetic interference and have limited measurement accuracy, making it difficult to meet the high-precision voltage measurement requirements of modern power systems. They also suffer from ferroresonance problems, which affect the safe and stable operation of power systems.
A voltage sensor for pole-mounted switches is designed. It adopts an insulating housing containing a sensing unit and a signal processing unit. The sensing unit consists of multiple series-connected capacitor elements, at least one of which is an adjustable capacitor. The signal processing unit includes a filter circuit and a multi-stage operational amplifier. The external sealing structure adopts a spiral sealing gasket. The insulating housing is equipped with heat dissipation fins and a buffer layer. The material is an insulating and fireproof material.
It achieves high-precision voltage measurement, adapts to different voltage scenarios, enhances the sealing and heat dissipation capabilities of the equipment, ensures stable and reliable operation in complex environments, prevents leakage and fire spread, and improves the safety and reliability of the power system.
Smart Images
Figure CN223624318U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pole-mounted switch technology, and more specifically, to a voltage sensor for pole-mounted switches. Background Technology
[0002] With the rapid development of smart grids, higher demands are being placed on the real-time monitoring and precise control of power systems. Pole-mounted switches, as key equipment in distribution networks, need to accurately acquire line voltage information to achieve real-time perception of the grid's operating status. Voltage sensors can collect voltage data in real time, providing crucial information for grid dispatching, fault diagnosis, and power quality analysis, thus contributing to the intelligent management and efficient operation of the power grid.
[0003] Traditional electromagnetic voltage transformers suffer from drawbacks such as large size, heavy weight, and high cost, making them inconvenient to install and maintain in pole-mounted switches. Furthermore, they are susceptible to electromagnetic interference and have limited measurement accuracy, failing to meet the high-precision voltage measurement requirements of modern power systems. In addition, electromagnetic voltage transformers also suffer from problems such as ferroresonance, which may affect the safe and stable operation of the power system. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a voltage sensor for pole-mounted switches that is stable in operation and easy to install.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a voltage sensor for a pole-mounted switch, comprising an insulating housing, an inlet assembly and an outlet assembly disposed on one side of the insulating housing, a sensing unit and a signal processing unit disposed inside the insulating housing, a sealing structure provided at the connection between the inlet / outlet assembly and the outside, the sealing structure comprising a sealing hole disposed inside the insulating housing and a sealing gasket disposed between the inlet / outlet assembly and the sealing hole, the sealing gasket having a spiral structure, the sealing hole being configured to deform the pressure portion on the sealing hole toward the center and fix the conductive component by squeezing the pressure portion on the sealing hole.
[0006] The present invention is further configured such that: the sensing unit is composed of a plurality of capacitor elements connected in series, and at least one of the capacitor elements is an adjustable capacitor.
[0007] The present invention is further configured such that: the adjustable capacitor includes a mounting frame, a moving plate and a fixed plate disposed on the mounting frame, a lead screw drive disposed on the mounting frame, and an external adjustment knob connected to the lead screw drive. By rotating the adjustment knob, the lead screw drive mechanism drives the moving plate to move relative to the fixed plate, thereby changing the capacitance value of the adjustable capacitor.
[0008] The present invention is further configured such that: the signal processing unit includes a filtering circuit and an amplification circuit; the filtering circuit adopts a bandpass filter to filter high-frequency noise and low-frequency interference signals in the voltage signal; and the amplification circuit is an amplification structure composed of multi-stage operational amplifiers.
[0009] The present invention is further configured such that: the outer surface of the insulating shell is provided with heat dissipation fins integrally molded by injection molding, and the heat dissipation fins are wavy in shape.
[0010] The present invention is further configured such that the sealing structure is made of insulating and fire-resistant materials.
[0011] The present invention is further configured such that: a buffer layer is provided inside the insulating housing to protect the sensing unit and the signal processing unit from vibration and impact.
[0012] The present invention is further configured such that the buffer layer is composed of insulating rubber distributed in a grid pattern.
[0013] The beneficial effects of this utility model are:
[0014] 1. The upper part of the insulating housing is equipped with an inlet assembly and an outlet assembly located on one side of the housing. This design fully considers the actual installation space and wiring requirements of the pole-mounted switch, contributing to the overall compactness and rational layout of the switch and enabling more functional integration within a limited space. The insulating housing also houses a sensing unit and a signal processing unit, preventing interference from external electric fields and avoiding the risk of leakage due to internal component failure, ensuring safe operation in high-voltage environments. Simultaneously, the sealing structure at the connection points between the inlet / outlet assemblies and the external environment is crucial. The sealing holes, combined with a spiral sealing gasket, effectively prevent the intrusion of dust, moisture, and impurities. Compared to ordinary sealing gaskets, the spiral sealing gasket creates a tighter fit during installation through spiral compression, enhancing sealing performance. Even in harsh outdoor environments, such as heavy rain and sandstorms, it ensures that internal components are not corroded, improving the reliability and service life of the equipment.
[0015] 2. The sensing unit consists of multiple capacitor elements connected in series, at least one of which is adjustable. This greatly enhances the adaptability of the voltage sensor to different voltage measurement scenarios. In actual power systems, the voltage of the lines connected to pole-mounted switches may fluctuate or vary depending on the application scenario. By rotating the external adjustment knob, the capacitance value of the adjustable capacitor can change the overall capacitance characteristics of the sensing unit, thereby accurately matching different voltage measurement requirements and ensuring high-precision voltage sensing data under various conditions. The unique structural design of the adjustable capacitor, which changes the capacitance value by moving the moving plate relative to the fixed plate through a screw drive, provides a powerful means to optimize the measurement range and accuracy. When measuring lower voltages, the adjustable capacitor increases its capacitance value, making the sensing unit more sensitive to low voltage changes and improving measurement accuracy; while when measuring higher voltages, the capacitance value decreases, ensuring that the sensing unit can still operate normally under high voltages without exceeding its range.
[0016] 3. The filtering circuit in the signal processing unit employs a bandpass filter, which can accurately filter out high-frequency noise and low-frequency interference signals in the voltage signal. In actual power system environments, various complex electromagnetic interferences exist. High-frequency noise may originate from nearby communication equipment, power electronic devices, etc., while low-frequency interference may originate from harmonics within the power system itself. The bandpass filter can, according to a set frequency range, allow only voltage signals of specific frequency bands to pass through, effectively removing interference from other frequency bands, thereby providing a clean and accurate voltage signal for subsequent signal processing and ensuring the reliability of measurement results. The amplification circuit, composed of multi-stage operational amplifiers, possesses powerful signal amplification capabilities. It can amplify the weak voltage signal after filtering stage by stage, amplifying it to an appropriate amplitude without signal distortion, thus improving the sensor's ability to process various voltage signals. The wave-shaped heat dissipation fins, integrally molded on the outer surface of the insulating shell, significantly enhance heat dissipation. The wave-shaped design increases the contact area between the heat dissipation fins and the air, more effectively transferring the heat generated inside the insulating shell to the surrounding air compared to traditional flat heat dissipation fins.
[0017] 4. The sealed structure is made of insulating material, providing additional electrical safety for the voltage sensor. In the high-voltage environment of the pole-mounted switch, excellent insulation performance prevents current leakage through the sealed parts, avoiding safety accidents caused by leakage and ensuring the safety of operators and surrounding equipment. Simultaneously, the insulation characteristics also help reduce the impact of external electromagnetic interference on the internal circuitry, ensuring the accuracy and stability of sensor measurements. The environment where the pole-mounted switch is located may have potential fire risks, such as short circuits or overloads caused by electrical faults that may generate high temperatures or open flames. The fire-resistant sealed structure can effectively prevent the spread of fire, reducing the damage to the sensor and surrounding equipment in the event of a fire, improving the safety and reliability of the entire power system, and ensuring the continuity of power supply. The pole-mounted switch is installed outdoors and may be affected by vibrations from wind, earthquakes, and vehicle traffic. The buffer layer inside the insulating housing is composed of grid-distributed insulating rubber, which can buffer vibrations and impacts in all directions, protecting the precision electronic components inside the sensing unit and signal processing unit, preventing loosening, damage, or breakage of connections due to vibration and impact, thereby ensuring that the sensor can operate stably and reliably in complex and changing environments. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the internal structure of the present invention;
[0019] Figure 2 This is a magnified view of point A;
[0020] Figure 3 This is a schematic diagram of an adjustable capacitor structure;
[0021] Figure 1-3 Reference numerals: 1. Insulating housing; 2. Inlet assembly; 3. Outlet assembly; 4. Sensing unit; 5. Signal processing unit; 6. Sealing hole; 7. Sealing gasket; 8. Adjustable capacitor; 9. Mounting bracket; 10. Moving plate; 11. Fixed plate; 12. Adjustment knob; 13. Heat dissipation fins; 14. Buffer layer. Detailed Implementation
[0022] Reference Figures 1 to 3 The embodiments of this utility model will be further described below.
[0023] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0024] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0025] Figures 1 to 3 The voltage sensor for a pole-mounted switch shown includes an insulating housing 1. An inlet assembly 2 and an outlet assembly 3 are located on one side of the insulating housing 1. This design fully considers the actual installation space and wiring requirements of the pole-mounted switch, helping to improve the overall compactness and layout rationality of the switch and achieving more functional integration within a limited space. The insulating housing 1 also houses a sensing unit 4 and a signal processing unit 5, preventing interference from external electric fields to the internal circuitry and avoiding leakage risks caused by internal component failures, ensuring safe operation in high-voltage environments. A sealing structure is provided at the connection point between the inlet / outlet assembly 3 and the external environment. This sealing structure includes a sealing hole 6 located within the insulating housing 1 and a sealing gasket 7 located between the inlet / outlet assembly 3 and the sealing hole 6. The sealing gasket 7 has a spiral structure. The sealing hole 6 is configured to deform the pressure-bearing portion towards the center and hold the conductive component in place by squeezing the pressure-bearing portion on the sealing hole 6. The sealing hole 6, in conjunction with the spiral sealing gasket 7, effectively prevents the intrusion of dust, moisture, impurities, etc. Compared to ordinary gaskets, the spiral-shaped sealing gasket 7 creates a tighter fit during installation through spiral compression, enhancing sealing performance. Even in harsh outdoor environments, such as heavy rain and sandstorms, it protects internal components from corrosion, improving equipment reliability and lifespan.
[0026] The sensing unit 4 consists of several capacitor elements connected in series, at least one of which is an adjustable capacitor 8. This greatly improves the adaptability of the voltage sensor to different voltage measurement scenarios. In actual power systems, the voltage of the line connected to the pole-mounted switch may fluctuate or vary depending on the application scenario. By rotating the external adjustment knob 12, the capacitance value of the adjustable capacitor 8 can be changed to alter the overall capacitance characteristics of the sensing unit 4, thereby accurately matching different voltage measurement requirements and ensuring high-precision voltage sensing data can be obtained under various conditions.
[0027] The adjustable capacitor 8 includes a mounting frame 9, a movable plate 10 and a fixed plate 11 mounted on the mounting frame 9, a lead screw drive mounted on the mounting frame 9, and an external adjustment knob 12 connected to the lead screw drive. By rotating the adjustment knob 12, the lead screw drive mechanism moves the movable plate 10 relative to the fixed plate 11, thereby changing the capacitance value of the adjustable capacitor 8. This provides a powerful means to optimize the measurement range and accuracy. When measuring lower voltages, the capacitance value of the adjustable capacitor 8 is increased, making the sensing unit 4 more sensitive to low voltage changes and improving measurement accuracy. When measuring higher voltages, the capacitance value is decreased to ensure that the sensing unit 4 can still work normally under high voltages without exceeding the measurement range.
[0028] The signal processing unit 5 includes a filtering circuit and an amplification circuit. The filtering circuit uses a bandpass filter, which can accurately filter out high-frequency noise and low-frequency interference signals in the voltage signal. In actual power system environments, there are various complex electromagnetic interferences. High-frequency noise may come from nearby communication equipment, power electronic devices, etc., while low-frequency interference may originate from harmonics within the power system itself. The bandpass filter can allow only voltage signals of specific frequency bands to pass through according to a set frequency range, effectively removing interference from other frequency bands, thereby providing a clean and accurate voltage signal for subsequent signal processing and ensuring the reliability of the measurement results. The amplification circuit is an amplification structure composed of multi-stage operational amplifiers, possessing powerful signal amplification capabilities. It can amplify the weak voltage signal after filtering stage by stage, amplifying it to an appropriate amplitude without ensuring signal distortion, thus improving the sensor's ability to process various voltage signals.
[0029] The outer surface of the insulating shell 1 is provided with an injection-molded heat dissipation fin 13. The heat dissipation fin 13 is wavy in shape, which increases the contact area between the heat dissipation fin 13 and the air. Compared with the traditional flat heat dissipation fin 13, it can more effectively transfer the heat generated inside the insulating shell 1 to the surrounding air.
[0030] The sealing structure is made of insulating and fire-resistant materials. The use of insulating materials provides additional electrical safety for the voltage sensor. In the high-voltage environment of the pole-mounted switch, excellent insulation prevents current leakage through the sealing area, avoiding safety accidents caused by leakage and ensuring the safety of operators and surrounding equipment. Simultaneously, the insulation properties also help reduce the impact of external electromagnetic interference on the internal circuitry, ensuring the accuracy and stability of sensor measurements. The environment where the pole-mounted switch is located may have potential fire risks, such as short circuits or overloads caused by electrical faults that may generate high temperatures or open flames. The fire-resistant sealing structure effectively prevents the spread of fire, reduces the damage to the sensor and surrounding equipment in the event of a fire, improves the safety and reliability of the entire power system, and ensures the continuity of power supply.
[0031] The insulating housing 1 is further provided with a buffer layer 14 to protect the sensing unit 4 and the signal processing unit 5 from vibration and impact. The buffer layer 14 is composed of insulating rubber in a grid pattern. The pole-mounted switch is installed outdoors and may be affected by vibrations caused by wind, earthquakes, vehicle traffic, etc. The buffer layer 14 in the insulating housing 1 is composed of insulating rubber in a grid pattern, which can buffer vibration and impact in all directions, protect the precision electronic components inside the sensing unit 4 and the signal processing unit 5, and prevent the components from loosening, being damaged or the connection points from breaking due to vibration and impact. This ensures that the sensor can still work stably and reliably in complex and changing environments.
[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A voltage sensor for a pole-mounted switch, comprising an insulating housing (1), characterized in that, The upper end of the insulating housing (1) is provided with an inlet assembly (2) and an outlet assembly (3) provided on one side of the insulating housing (1). The insulating housing (1) is also provided with a sensing unit (4) and a signal processing unit (5). The inlet and outlet assemblies (3) are provided with a sealing structure at the connection with the outside. The sealing structure includes a sealing hole (6) provided in the insulating housing (1) and a sealing gasket (7) provided between the inlet and outlet assemblies (3) and the sealing hole (6). The sealing gasket (7) has a spiral structure. The sealing hole (6) is configured to deform the pressure part on the sealing hole (6) towards the center and fix the conductive component by squeezing the pressure part on the sealing hole (6).
2. The voltage sensor for a pole-mounted switch according to claim 1, characterized in that, The sensing unit (4) consists of several capacitor elements connected in series, at least one of which is an adjustable capacitor (8).
3. A voltage sensor for a pole-mounted switch according to claim 2, characterized in that, The adjustable capacitor (8) includes a mounting frame (9), a movable plate (10) and a fixed plate (11) mounted on the mounting frame (9), a screw drive mounted on the mounting frame (9), and an external adjustment knob (12) connected to the screw drive. By rotating the adjustment knob (12), the screw drive mechanism drives the movable plate (10) to move relative to the fixed plate (11), thereby changing the capacitance value of the adjustable capacitor (8).
4. A voltage sensor for a pole-mounted switch according to claim 1, characterized in that, The signal processing unit (5) includes a filtering circuit and an amplification circuit. The filtering circuit uses a bandpass filter to filter high-frequency noise and low-frequency interference signals in the voltage signal. The amplification circuit is an amplification structure composed of multi-stage operational amplifiers.
5. A voltage sensor for a pole-mounted switch according to claim 1, characterized in that, The outer surface of the insulating shell (1) is provided with heat dissipation fins (13) integrally molded by injection molding, and the heat dissipation fins (13) are wavy in shape.
6. A voltage sensor for a pole-mounted switch according to claim 1, characterized in that, The sealing structure is made of insulating and fire-resistant materials.
7. A voltage sensor for a pole-mounted switch according to claim 1, characterized in that, The insulating housing (1) is also provided with a buffer layer (14) to protect the sensing unit (4) and the signal processing unit (5) from vibration and impact.
8. A voltage sensor for a pole-mounted switch according to claim 7, characterized in that, The buffer layer (14) is composed of insulating rubber distributed in a grid pattern.