Phase difference angle difference adjustable fourth-order voltage sensor

Abstract

The utility model relates to the technical field of power grid voltage measurement, especially four order voltage sensor of adjustable ratio difference angle difference, be used to improve medium voltage power grid voltage measurement precision, include: high pressure module is connected to the arc chamber upper end or lower end medium voltage power grid access point of circuit breaker through high pressure lead, to obtain medium voltage power grid voltage signal, high pressure module includes isolation transformer, the primary winding L1 of mutual inductor is set on the incoming line end or outgoing line end wire of isolation transformer, epoxy resin solid seal body, the whole solid seal of high pressure module, ratio difference angle difference adjusting circuit is connected to the output winding of isolation transformer through the aviation line of aviation socket, ratio difference angle difference adjusting circuit is integrated in the comprehensive debugging circuit in the pole switch box body on the telegraph pole, through adopting the combination of high pressure module, epoxy resin solid seal body and ratio difference angle difference adjusting circuit, the performance of voltage measurement has been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of power grid voltage measurement technology, and in particular to a fourth-order voltage sensor with adjustable ratio and angle difference. Background Technology

[0002] The power distribution network is a crucial foundation of the energy internet and a key link affecting the level of power supply services. With the large-scale integration of electric vehicles, distributed energy sources, microgrids, energy storage devices, and other facilities, as well as the development of the electricity market and the emergence of various electricity demands, higher requirements are placed on the security, economy, and adaptability of the power distribution network. It is imperative to build a first-class modern power distribution network that is highly reliable, interactive, and cost-effective. The intelligentization of the power distribution network relies on intelligent terminals. Based on the two-level power research institute's quality control platform for power distribution terminal equipment, a full life-cycle quality control system for power distribution automation equipment should be established. This system should strengthen three-level quality control for power distribution terminals and circuit breakers: network entry inspection, full inspection upon arrival, and operational evaluation. It should achieve online integration of inspection reports, operational data, and defect records, and conduct comparative analysis by batch, manufacturer, model, region, and cycle. Through quality evaluation, it should achieve full-process tracking of product quality, simultaneous accountability, and timely handling.

[0003] However, current voltage sensors used in solid-sealed terminals generally suffer from several technical bottlenecks. Specifically, the high-voltage capacitors in voltage sensors currently used in solid-sealed terminals are mostly film capacitors. These film capacitors have significant limitations: their operating temperature range is low, making it difficult to match the curing temperature of the epoxy resin used in the solid-sealed terminals. This mismatch often necessitates secondary sealing during manufacturing, increasing process complexity and production costs. More importantly, film capacitors exhibit significant temperature drift, meaning their measurement accuracy fluctuates significantly with changes in ambient temperature, making accurate voltage measurement difficult. Long-term temperature drift and mismatch issues also shorten the lifespan of film capacitors, consequently affecting the overall lifespan and reliability of the entire solid-sealed terminal. These problems severely restrict the accuracy and stability of medium-voltage power grid voltage measurement, failing to meet the demands of modern distribution networks for high-precision, high-reliability voltage measurement.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a fourth-order voltage sensor with adjustable ratio and angle differences.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fourth-order voltage sensor with adjustable ratio and angle difference, a high-voltage module, which is connected to the medium-voltage grid access point at the upper or lower end of the arc-extinguishing chamber of the circuit breaker through a high-voltage lead to obtain the medium-voltage grid voltage signal. The high-voltage module includes an isolation transformer, and the primary winding L1 of the current transformer is sleeved on the conductor at the input or output end of the isolation transformer.

[0007] An epoxy resin encapsulation body is used to completely encapsulate the high-voltage module.

[0008] The ratio and angle difference adjustment circuit is connected to the output winding of the isolation transformer via an aviation line from an aviation socket. The ratio and angle difference adjustment circuit is integrated into the comprehensive debugging circuit inside the pole-mounted switch box on the utility pole. The ratio and angle difference adjustment circuit includes the secondary winding L2 of the current transformer and the capacitor C2 connected in series to form the L2-C2 branch. A first adjustable resistor W1 is connected in parallel across the two ends of the secondary winding L2 of the current transformer, and a second adjustable resistor W2 is connected in parallel across the two ends of the L2-C2 branch.

[0009] This technical solution enables accurate acquisition, isolation and sealing of medium-voltage grid voltage signals, and effective adjustment of ratio and angle differences, thereby significantly improving voltage measurement accuracy and laying the foundation for subsequent refined compensation.

[0010] Furthermore, the high-voltage module also includes:

[0011] The resistor array is connected in series with the high-voltage lead to form the high-voltage voltage divider main circuit;

[0012] An isolation circuit board is connected to a resistor array via a fixed connector. The isolation transformer is integrated on the isolation circuit board. The isolation circuit board also integrates an overvoltage protection module consisting of a parallel discharge tube and a ceramic capacitor C1. One end of the input winding of the isolation transformer is connected to the overvoltage protection module, and the other end of the input winding is connected to the circuit breaker housing and grounded.

[0013] This technical solution enables high-voltage voltage division through a resistor array and effectively protects the isolation transformer through an overvoltage protection module on the isolation circuit board, thereby improving the safety and stability of the system.

[0014] More specifically, in some implementations, the resistor array consists of multiple cryogenic high-voltage resistors connected in series.

[0015] This technical solution can effectively reduce the temperature drift of the resistance array, thereby improving the accuracy and stability of the voltage divider and ensuring measurement accuracy under different ambient temperatures.

[0016] Preferably, the first adjustable resistor W1 achieves angle difference compensation by shunting current, and the second adjustable resistor W2 achieves ratio difference compensation by changing the output impedance.

[0017] This technical solution enables precise compensation for angle difference and ratio difference using adjustable resistors W1 and W2, respectively, thereby further improving the accuracy of voltage measurement and meeting the requirements of high-precision metering.

[0018] The epoxy resin sealant disclosed in this utility model is a one-time integral casting and sealing structure without a secondary potting interface.

[0019] This technical solution simplifies the manufacturing process, avoids the increased complexity and cost of secondary sealing, eliminates reliability issues that may arise from secondary potting interfaces, and improves the overall sealing performance and lifespan of the product.

[0020] Furthermore, the outer surface of the epoxy resin sealant is coated with silicone rubber.

[0021] This technical solution provides additional insulation and moisture protection for the solidified enclosure, enhancing its environmental adaptability and long-term operational reliability.

[0022] This utility model also includes a fixing component, which is installed on the outside of the epoxy resin seal and is used to fix the sensor to the circuit breaker housing and make the sensor grounding terminal connected to the ground.

[0023] This technical solution ensures the stable installation and reliable grounding of the sensor, guaranteeing the safe operation of the equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention significantly improves voltage measurement performance by combining a high-voltage module, an epoxy resin encapsulation body, and a specific angle difference adjustment circuit. First, this invention avoids reliance on thin-film capacitors, fundamentally solving their inherent temperature range limitations and temperature drift problems, ensuring the sensor maintains high-precision measurement over a wider range of ambient temperatures. Second, the epoxy resin encapsulation body provides overall encapsulation of the high-voltage module, particularly using a one-time integral casting encapsulation structure, eliminating the need for secondary encapsulation in existing technologies. This greatly simplifies the manufacturing process, reduces production costs, and significantly improves the overall sealing performance and long-term operational reliability of the product. Furthermore, the introduction of the specific angle difference adjustment circuit, using a first adjustable resistor W1 for angle difference compensation and a second adjustable resistor W2 for specific difference compensation, allows the sensor to accurately correct measurement errors, further improving voltage measurement accuracy. This precise compensation mechanism enables this invention to meet the stringent requirements of modern power distribution networks for high-precision, high-reliability voltage measurement, providing solid technical support for the construction of smart power distribution networks. Attached Figure Description

[0026] Figure 1Schematic diagram of the external structure of a fourth-order voltage sensor with adjustable ratio and angle difference. Figure 1 ;

[0027] Figure 2 Schematic diagram of the external structure of a fourth-order voltage sensor with adjustable ratio and angle difference. Figure 2 ;

[0028] Figure 3 Schematic diagram of a fourth-order voltage sensor with adjustable input line differential angle;

[0029] Figure 4 This is a schematic diagram of a fourth-order voltage sensor with adjustable differential angle on the output side.

[0030] In the diagram: 1. High-voltage lead; 2. Resistor busbar; 3. Fixing connector; 4. Isolation circuit board; 5. Aviation socket; 6. Epoxy resin; 7. Silicone rubber; 8. Fixing component. Detailed Implementation

[0031] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] Existing medium-voltage power grid voltage sensors commonly use a thin-film capacitor embedded in a solid-sealed electrode as the high-voltage capacitor for voltage measurement. However, the operating temperature range of the thin-film capacitor is relatively low, which is mismatched with the curing temperature of the epoxy resin used in the solid-sealed electrode. This can lead to thermal stress affecting the thin-film capacitor during the secondary sealing process. Furthermore, the thin-film capacitor exhibits significant temperature drift, making accurate voltage measurement difficult and resulting in a relatively short lifespan under long-term operation, thus affecting the overall lifespan and reliability of the entire solid-sealed electrode.

[0033] For example, suppose a smart distribution network requires real-time, high-precision monitoring of medium-voltage lines to support automated control and fault diagnosis. If traditional thin-film capacitive voltage sensors are used, their measurement accuracy will significantly decrease under conditions of large ambient temperature fluctuations or prolonged operation and heat generation. This leads to distorted grid operation data, potentially causing misjudgments or control errors, severely impacting the safety, economy, and adaptability of the distribution network. Failure to address these issues will directly hinder the construction and development of smart distribution networks, failing to meet future demands for high-reliability, high-precision grid measurement.

[0034] To address this issue, this application proposes a fourth-order voltage sensor with adjustable specific and angle differences, aiming to effectively improve the voltage measurement accuracy of medium-voltage power grids and overcome the problems of large temperature drift and short lifespan of thin-film capacitors in existing technologies. By introducing core components such as a high-voltage module, an epoxy resin encapsulation body 6, and a specific and angle difference adjustment circuit, this sensor achieves accurate acquisition, reliable encapsulation, and error compensation of voltage signals, thereby significantly improving measurement accuracy and equipment lifespan.

[0035] To better understand the adjustable ratio and angle difference fourth-order voltage sensor disclosed in this embodiment, the key terms and implementation environment involved are first explained. This sensor is mainly used in medium-voltage power grid environments, and its core function is to accurately measure the voltage signal of the medium-voltage power grid. The high-voltage module is the interface between the sensor and the medium-voltage power grid, responsible for the initial processing of the high-voltage signal. The isolation transformer in the high-voltage module plays a role in electrical isolation and voltage transformation, ensuring the safety of the measurement system and effective signal transmission. The primary winding L1 of the current transformer is used to sense the current signal on the high-voltage side, providing auxiliary information for subsequent voltage measurement. The epoxy resin encapsulation body 6 is an insulating material used to encapsulate the high-voltage module as a whole, providing excellent insulation performance and mechanical protection. The ratio and angle difference adjustment circuit is one of the core innovations of this sensor. Its function is to accurately compensate for the ratio difference (amplitude error) and angle difference (phase error) of the voltage signal to eliminate measurement errors. This circuit is usually integrated into the integrated debugging circuit inside the pole-mounted switch box on the utility pole, facilitating on-site debugging and maintenance. The secondary winding L2 of the current transformer, the capacitor C2, the first adjustable resistor W1, and the second adjustable resistor W2 are key components of the ratio and angle difference adjustment circuit. They work together to achieve precise adjustment of the ratio and angle difference.

[0036] like Figures 1 to 3 The fourth-order voltage sensor with adjustable ratio and angle difference shown is used to improve the voltage measurement accuracy of medium-voltage power grids, and includes:

[0037] The high-voltage module is connected to the medium-voltage grid access point at the upper or lower end of the arc-extinguishing chamber of the circuit breaker via the high-voltage lead 1 to obtain the medium-voltage grid voltage signal. The high-voltage module includes an isolation transformer, and the primary winding L1 of the current transformer is sleeved on the conductor at the input or output end of the isolation transformer.

[0038] The epoxy resin encapsulation 6 encapsulates the entire high-voltage module.

[0039] The ratio and angle difference adjustment circuit is connected to the output winding of the isolation transformer via the aviation line of aviation socket 5. The ratio and angle difference adjustment circuit is integrated into the comprehensive debugging circuit in the pole-mounted switch box on the utility pole. The ratio and angle difference adjustment circuit includes the secondary winding L2 of the current transformer and the capacitor C2 connected in series to form the L2-C2 branch. The two ends of the secondary winding L2 of the current transformer are connected in parallel with the first adjustable resistor W1, and the two ends of the L2-C2 branch are connected in parallel with the second adjustable resistor W2.

[0040] The specificity and angle difference adjustment circuit is a key component of this sensor, and it is connected to the output winding of the isolation transformer via an aviation cable from aviation socket 5. This specificity and angle difference adjustment circuit is integrated into the comprehensive debugging circuit within the pole-mounted switch box on the utility pole, facilitating on-site installation, debugging, and maintenance.

[0041] The adjustable ratio and angle difference fourth-order voltage sensor disclosed in this embodiment addresses the problems of existing technologies through the following working principle and the function of each component: First, the voltage signal from the medium-voltage power grid is introduced into the high-voltage module via the high-voltage lead 1. Inside the high-voltage module, an isolation transformer provides electrical isolation and preliminary voltage reduction for the high-voltage signal. Simultaneously, the primary winding L1 of the current transformer also participates in signal induction during this process. Thus, the high-voltage module can safely and effectively acquire the original voltage signal from the medium-voltage power grid. Subsequently, the entire high-voltage module is integrally cast and sealed with epoxy resin encapsulation 6 in a single process. This not only provides excellent insulation performance, effectively preventing the intrusion of moisture and dust, but also enhances the mechanical strength and environmental resistance of the device, thereby significantly extending the sensor's service life and avoiding the secondary sealing problem caused by temperature mismatch in traditional thin-film capacitors. Next, the voltage signal processed by the isolation transformer is transmitted to the ratio and angle difference adjustment circuit via the aviation line of the aviation socket 5. The ratio and angle difference adjustment circuit is cleverly integrated into the comprehensive debugging circuit within the pole-mounted switch box on the utility pole, making sensor installation and on-site debugging much more convenient. In the ratio and angle difference adjustment circuit, the secondary winding L2 of the current transformer is connected in series with capacitor C2 to form the L2-C2 branch, a structure that lays the foundation for subsequent error compensation. To achieve precise compensation of ratio and angle differences, a first adjustable resistor W1 is connected in parallel across the secondary winding L2 of the current transformer, its main function being to finely adjust the angle difference of the sensor through current shunting. Simultaneously, a second adjustable resistor W2 is connected in parallel across the L2-C2 branch, its main function being to change the output impedance, thereby achieving precise compensation of the sensor's ratio difference. By adjusting the first adjustable resistor W1 and the second adjustable resistor W2, the amplitude and phase errors generated by the sensor during measurement can be effectively corrected, ensuring that the output voltage signal is highly consistent with the actual grid voltage signal. The entire process enables the sensor to output a precisely compensated high-precision voltage signal, significantly improving the accuracy of medium-voltage grid voltage measurement and providing reliable data support for the operation and management of the smart grid.

[0042] In some embodiments described above in this application, the high-voltage module only mentions the isolation transformer and the primary winding L1 of the instrument transformer. In practical applications, directly connecting the medium-voltage grid voltage signal may face problems such as insufficient effective voltage division of the high-voltage signal and lack of necessary overvoltage protection, thereby affecting the stability of the measurement and the long-term safety of the equipment. Therefore, this application further proposes an optimization scheme for the high-voltage module, aiming to improve the reliability and safety of high-voltage signal processing by adding key components.

[0043] As one embodiment of this utility model, the high-voltage module further includes:

[0044] Resistor bar 2 is connected in series with high voltage lead 1 to form a high voltage divider main circuit;

[0045] The isolation circuit board 4 is connected to the resistor array 2 via the fixed connector 3. The isolation transformer is integrated on the isolation circuit board 4. The isolation circuit board 4 also integrates an overvoltage protection module consisting of parallel discharge tubes and ceramic capacitor C1. One end of the input winding of the isolation transformer is connected to the overvoltage protection module, and the other end of the input winding is connected to the circuit breaker housing and grounded.

[0046] The proposed solution introduces resistor array 2 to effectively divide the medium-voltage grid voltage signal, enabling the high-voltage signal to be safely and accurately converted into a voltage range suitable for the isolation transformer, thus solving the overload problem that may result from directly connecting the high-voltage signal. Simultaneously, by integrating an overvoltage protection module on the isolation circuit board 4, the module can respond rapidly to transient overvoltages in the grid. Through the synergistic action of the discharge tube and ceramic capacitor C1, the excessive voltage energy is discharged to ground, effectively protecting the isolation transformer and the entire sensor system from high-voltage surges, significantly improving the durability and operational safety of the equipment. The introduction of the isolation circuit board 4 provides a stable and integrated platform for these key high-voltage components, ensuring the reliability of electrical connections and the compactness of the overall structure.

[0047] As one embodiment of this utility model, the resistor array 2 is composed of multiple low-temperature drift high-voltage resistors connected in series.

[0048] Low-temperature drift high-voltage resistors are resistive elements whose resistance drifts minimally with temperature changes. They are typically manufactured using special materials and processes to ensure high stability under varying temperature conditions. High-voltage resistors, on the other hand, can withstand high voltages without breakdown or performance degradation. By connecting multiple such resistors in series, high voltage can be effectively distributed, further improving the overall voltage withstand capability and stability of the resistor array.

[0049] The solution presented in this application effectively solves the problem of resistance value drift caused by temperature changes in traditional resistors by designing resistor array 2 as a series connection of multiple low-temperature-drift high-voltage resistors. Due to the low-temperature-drift characteristic, the overall resistance value of resistor array 2 remains highly stable over a wide temperature range, thus ensuring that the voltage division ratio accuracy of the high-voltage divider main circuit is unaffected by ambient temperature fluctuations. Furthermore, the series connection of multiple high-voltage resistors disperses the high voltage, reducing the voltage stress on individual resistors and further improving the reliability and long-term stability of the entire high-voltage module.

[0050] In one embodiment of this utility model, the first adjustable resistor W1 achieves angle difference compensation by current shunting, and the second adjustable resistor W2 changes the output impedance to achieve ratio difference compensation.

[0051] The first adjustable resistor W1 achieves phase difference compensation through current shunting. This means that by adjusting the resistance value of the first adjustable resistor W1, the phase of the current flowing through the secondary winding L2 of the transformer can be changed, thereby achieving precise phase difference compensation. Specifically, when the phase difference to be compensated is large, the resistance value of the first adjustable resistor W1 can be decreased to increase the current shunting, thereby increasing the adjustment range of the current phase; conversely, when the phase difference to be compensated is small, the resistance value of the first adjustable resistor W1 can be increased to decrease the current shunting, thereby decreasing the adjustment range of the current phase.

[0052] The second adjustable resistor W2 alters the output impedance to achieve ratio difference compensation. This means that by adjusting the resistance value of the second adjustable resistor W2, the output impedance of the ratio difference / angle difference adjustment circuit can be changed, thereby achieving precise ratio difference compensation. Specifically, when the ratio difference to be compensated is large, the resistance value of the second adjustable resistor W2 can be decreased to reduce the output impedance, thereby increasing the amplitude of the output voltage; conversely, when the ratio difference to be compensated is small, the resistance value of the second adjustable resistor W2 can be increased to increase the output impedance, thereby decreasing the amplitude of the output voltage.

[0053] The solution in this application utilizes the shunting effect of the first adjustable resistor W1 to precisely adjust the current phase, thereby compensating for the diagonal difference. Simultaneously, by adjusting the output impedance through the second adjustable resistor W2, the amplitude of the output voltage can be precisely adjusted, thus compensating for the ratio difference. Through the synergistic effect of the two adjustable resistors, independent adjustment of the diagonal and ratio differences can be achieved, thereby improving the measurement accuracy of the voltage sensor.

[0054] As one embodiment of this utility model, the epoxy resin sealant 6 is a one-time integral casting and sealing structure without a secondary potting interface.

[0055] The one-time integral casting and sealing structure refers to the complete encapsulation of the high-voltage module by epoxy resin in a single casting process, eliminating the need for subsequent secondary potting operations. This structure avoids interface problems that may arise from multiple potting processes, ensuring the integrity and insulation of the sealed body.

[0056] As one embodiment of this utility model, the epoxy resin encapsulant 6 is coated with silicone rubber 7.

[0057] The primary function of the epoxy resin encapsulation 6 is to insulate and protect the high-voltage module from external environmental factors. However, epoxy resin itself may age and crack due to factors such as ultraviolet radiation and temperature changes during long-term use, thus affecting its protective effect. Silicone rubber 7, on the other hand, is a polymer material with excellent weather resistance, high and low temperature resistance, and electrical insulation. By coating the epoxy resin encapsulation 6 with a layer of silicone rubber 7, direct corrosion of the epoxy resin by the external environment can be effectively prevented, its aging process can be slowed down, and its service life can be improved. Furthermore, silicone rubber 7 also has a certain buffering effect, which can reduce the impact of external impacts on the epoxy resin encapsulation 6, further improving the reliability of the sensor.

[0058] Specifically, silicone rubber 7 coats the outer surface of the epoxy resin encapsulant 6, forming an additional protective layer. This silicone rubber 7 effectively blocks the corrosion of the epoxy resin by ultraviolet rays, moisture, and chemicals, thereby slowing down the aging rate of the epoxy resin. At the same time, silicone rubber 7 has good elasticity, allowing it to adapt to the expansion and contraction of the epoxy resin caused by temperature changes, preventing it from cracking due to stress concentration. Furthermore, silicone rubber 7 also has a certain shock absorption effect, absorbing external impact energy and protecting the internal high-voltage modules from damage.

[0059] As one embodiment of this utility model, it also includes a fixing member 8, which is installed on the outside of the epoxy resin seal 6 and is used to fix the sensor to the circuit breaker housing and make the sensor grounding terminal connected to the ground.

[0060] The function of the fastener 8 is to provide a stable installation method, preventing the sensor from shifting or loosening due to vibration, external forces, or other factors. Specifically, the fastener 8 can be made of metal, such as stainless steel or aluminum alloy, to ensure its strength and corrosion resistance. The design of the fastener 8 needs to consider the connection method with the epoxy resin sealant 6 and the circuit breaker housing, such as fixing by bolts, clips, etc. In addition, the fastener 8 also needs to have good conductivity to ensure effective conduction between the sensor grounding terminal and the earth, thereby avoiding potential drift and electromagnetic interference.

[0061] The solution proposed in this application achieves reliable fixation and effective grounding of the sensor to the circuit breaker housing by installing a fixing component 8 on the outside of the epoxy resin encapsulation body 6. This design not only improves the installation stability and reliability of the sensor but also reduces measurement errors and safety risks caused by improper installation. By reliably fixing the sensor to the circuit breaker housing with the fixing component 8 and ensuring that the grounding terminal is connected to the earth, it effectively prevents the sensor from loosening due to vibration or external force, thereby guaranteeing the accuracy and stability of voltage signal acquisition. Simultaneously, good grounding reduces electromagnetic interference, improves the sensor's anti-interference capability, and further enhances measurement accuracy.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection claimed by this utility model, which is defined by the appended claims and their equivalents.

Claims

1. A fourth-order voltage sensor with adjustable ratio and angle difference, used to improve the voltage measurement accuracy of medium-voltage power grids, characterized in that, include: The high-voltage module is connected to the medium-voltage grid access point at the upper or lower end of the arc-extinguishing chamber of the circuit breaker via a high-voltage lead (1) to obtain the medium-voltage grid voltage signal. The high-voltage module includes an isolation transformer, and the primary winding L1 of the current transformer is sleeved on the conductor at the input or output end of the isolation transformer. An epoxy resin encapsulation (6) is used to encapsulate the entire high-voltage module. The ratio and angle difference adjustment circuit is connected to the output winding of the isolation transformer via the aviation line of the aviation socket (5). The ratio and angle difference adjustment circuit is integrated into the comprehensive debugging circuit in the pole-mounted switch box on the utility pole. The ratio and angle difference adjustment circuit includes the secondary winding L2 of the current transformer and the capacitor C2 connected in series to form the L2-C2 branch. The two ends of the secondary winding L2 of the current transformer are connected in parallel with a first adjustable resistor W1, and the two ends of the L2-C2 branch are connected in parallel with a second adjustable resistor W2.

2. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 1, characterized in that, The high-voltage module also includes: The resistor array (2) is connected in series with the high voltage lead (1) to form a high voltage divider main circuit; The isolation circuit board (4) is connected to the resistor array (2) through the fixed connector (3). The isolation transformer is integrated on the isolation circuit board (4). The isolation circuit board (4) also integrates an overvoltage protection module consisting of parallel discharge tubes and ceramic capacitor C1. One end of the input winding of the isolation transformer is connected to the overvoltage protection module, and the other end of the input winding is connected to the circuit breaker housing and grounded.

3. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 2, characterized in that, The resistor array (2) is composed of multiple low-temperature drift high-voltage resistors connected in series.

4. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 1, characterized in that, The first adjustable resistor W1 achieves angle difference compensation by shunting current, and the second adjustable resistor W2 achieves ratio difference compensation by changing the output impedance.

5. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 1, characterized in that, The epoxy resin sealant (6) is a one-time integral casting and sealing structure without a secondary potting interface.

6. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 5, characterized in that, The epoxy resin sealant (6) is coated with silicone rubber (7).

7. The fourth-order voltage sensor with adjustable ratio and angle difference according to claim 1, characterized in that, It also includes a fixing element (8), which is installed on the outside of the epoxy resin seal (6) to fix the sensor to the circuit breaker housing and make the sensor grounding terminal connected to the ground.

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