A nonlinear neutral point grounding resistance complete set

Abstract

The present invention relates to the technical field of power equipment, and discloses a nonlinear neutral point grounding resistor assembly, comprising a cabinet, a disconnector, a fuse, and a current transformer, and further comprising a resistor module, wherein the resistor module comprises a plurality of conventional grounding sections and a transient compensation section; the conventional grounding section comprises a grounding resistor and a circuit breaker connected in series, the upper end of the grounding resistor being connected to the neutral point via a fuse, and the lower end of the circuit breaker being grounded; the transient compensation section comprises a compensation resistor, one end of the compensation resistor being connected between the grounding resistor and the circuit breaker of each conventional grounding section, and the other end being grounded; a short-circuit mechanism being connected in series between the compensation resistor and each grounding resistor, and both the grounding resistor and the compensation resistor being nonlinear resistors. The present invention can reduce the probability of a fuse blowing while meeting safety requirements. Even if a fuse of a group of conventional grounding sections blows and is isolated, the grounding resistor and the compensation resistor work together, making safety hazards less likely to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to a nonlinear neutral point grounding resistor complete set. Background Art

[0002] The nonlinear neutral grounding resistor system combines the advantages of high power supply security of an ineffectively grounded system with the low overvoltage levels of an effectively grounded system. It also eliminates single-phase arc grounding and resonance faults. Its core component is a nonlinear resistor. Connecting the nonlinear resistor between the system neutral point and ground creates a novel nonlinear resistor grounding method. This method fully utilizes the nonlinear resistor's excellent volt-ampere characteristics, large thermal capacity, and fast response speed. Setting its operating value at the system phase voltage level yields excellent results during operation. System overvoltage levels grounded by the nonlinear resistor are limited to the allowable insulation range, minimizing the likelihood of high voltage shocks to electrical equipment insulation and significantly reducing the probability of minor faults cascading into major failures (such as short-circuit faults caused by single-phase grounding). This significantly improves power supply reliability and safety. The device's zinc oxide valve plate assembly consists of multiple nonlinear resistors connected in parallel, each with identical volt-ampere characteristics. Each circuit is equipped with a special fuse to ensure the proper operation of the entire valve plate assembly.

[0003] However, nonlinear resistors are relatively expensive, and the number of nonlinear resistors required for larger capacity increases, which increases the cost of the equipment. In addition, when encountering a large overvoltage, the fuse will burn out. Although this will prevent the equipment from being burned and the grounding system can still be used normally, the nonlinear resistor in this line will be isolated, reducing the capacity of the system, which may easily cause safety hazards when high overvoltage occurs subsequently.

[0004] For example, the invention patent with publication number CN117767243A discloses an oxidative nonlinear neutral point grounding resistor device, comprising: an installation cabinet installed on the ground and provided with a cabinet door; a blocking switch installed above the middle of the installation cabinet, with the incoming line port of the blocking switch connected to the system neutral point; a nonlinear resistor installed below the middle of the installation cabinet, with the nonlinear resistor connected to the working ground; a protection mechanism connected between the blocking switch and the nonlinear resistor; and a control mechanism installed on the cabinet door, the control mechanism being connected to the protection mechanism and the control mechanism respectively; wherein the protection mechanism is used to protect the power distribution system from faults and also for excessive current in the circuit, the control mechanism is used to receive signals from the protection mechanism and the nonlinear resistor, and the control mechanism is also used to display information to the operator; the beneficial effects of this invention are: alarm function, high power supply reliability and high safety. In this technical solution, the protection mechanism is used to protect the power distribution system from faults and also for excessive current in the circuit.

[0005] Conventional nonlinear neutral grounding resistor systems consist of multiple nonlinear resistors connected in parallel, each with identical volt-ampere characteristics. Each resistor is connected in series with a special fuse to ensure the proper operation of the entire valve assembly. However, when a large overvoltage occurs, the fuse blows. While this prevents damage to the equipment and allows the grounding system to function normally, it isolates the nonlinear resistor in that circuit, reducing the system's capacity and potentially posing a safety hazard in the event of a subsequent high-voltage overvoltage. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a nonlinear neutral point grounding resistor complete set.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a nonlinear neutral point grounding resistor complete set, comprising a cabinet, an isolating switch, a fuse, and a current transformer, and also comprising a resistance module, wherein the resistance module comprises a plurality of conventional grounding parts and a transient compensation part;

[0008] The conventional grounding part includes a grounding resistor and a circuit breaker connected in series, the upper end of the grounding resistor is connected to the neutral point through a fuse, and the lower end of the circuit breaker is grounded. The circuit breaker is used to break the circuit when the voltage is instantaneously increased;

[0009] The instantaneous compensation unit includes a compensation resistor, which is used to increase the resistance value of the grounding resistor during instantaneous voltage boost. One end of the compensation resistor is connected between the grounding resistor of each conventional grounding unit and the circuit breaker mechanism, and the other end is grounded. A short-circuit mechanism is connected in series between the compensation resistor and each grounding resistor. The short-circuit mechanism is used for short-circuiting during instantaneous voltage boost.

[0010] The grounding resistor and the compensation resistor are both non-linear resistors.

[0011] In order to further realize the present invention, the following technical solutions may be preferably used:

[0012] Preferably, the conventional grounding portion further includes a small resistor, and the rear end of the circuit breaker mechanism is connected in series with the small resistor and then grounded.

[0013] Preferably, the circuit breaker mechanism includes a contactor and a thermal relay connected in series.

[0014] Preferably, the short-circuit mechanism comprises a capacitor, and the capacitor is a liquid capacitor or a gas capacitor.

[0015] Preferably, the short-circuit mechanism further includes a discharge mechanism, and the discharge mechanism is used to discharge the capacitor after charging.

[0016] Preferably, the discharge mechanism includes a discharge resistor and a spring rod, the discharge resistor is connected in parallel to the capacitor, one end of the discharge resistor is connected to one end of the capacitor through a wire, and the other end of the discharge resistor is connected to the other end of the capacitor through the spring rod, the spring rod is made of elastic material, one end of the spring rod is connected to the discharge resistor, and the other end corresponds to the terminal of the capacitor.

[0017] Preferably, the discharge mechanism also includes a swinging mechanism, which is used to drive the spring rod to swing after the capacitor is charged. The swinging mechanism includes a push rod and an electromagnet. The push rod is laterally translated and arranged on the side of the spring rod close to the capacitor terminal. The push rod is provided with a spring. The spring drives the push rod to translate toward the spring rod, so that the upper end of the spring rod is separated from the capacitor terminal. The electromagnet is connected in parallel with the capacitor and is located on the side of the push rod away from the spring rod. When the electromagnet is energized, it drives the push rod to translate toward the side away from the spring rod.

[0018] Preferably, the swing mechanism further includes an adapter plate, which is vertically arranged between the spring rod and the terminal of the capacitor, the adapter plate is connected to the terminal of the capacitor, and the spring rod contacts the adapter plate when swinging.

[0019] Preferably, the push rod includes an insulating section and a magnetic section. The insulating section is in the shape of a flat plate made of insulating material. The insulating section is laterally slidably arranged on the adapter plate. The magnetic section is made of permanent magnetic material and is fixedly arranged on the side of the insulating section away from the elastic rod.

[0020] Preferably, the resistance module comprises a mounting frame, and the conventional grounding portion and the transient compensation portion are both fixedly mounted in the mounting frame.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention utilizes a resistor module composed of multiple conventional grounding sections and a transient compensation section. Utilizing the characteristics of nonlinear resistors and the coordination of a circuit-breaking mechanism and a short-circuiting mechanism, the present invention is able to meet the requirements of stable long-term operation while also rapidly responding to transient overvoltage conditions, thereby achieving a safe and reliable operation. One transient compensation section corresponds to all conventional grounding sections, reducing the use of nonlinear resistors while still meeting safety requirements. This not only reduces equipment costs but also reduces the probability of fuse blowout when encountering large overvoltages while still meeting safety requirements. Even if a group of conventional grounding sections is isolated by a fuse blown, the grounding resistor and compensation resistor can work together in the event of a subsequent high overvoltage, effectively increasing capacity and minimizing safety risks.

[0023] 2. The conventional grounding part of the present invention is connected in series with a small resistor at the rear end of the circuit-breaking mechanism. If an overvoltage is triggered, the small resistor can share part of the current, reduce the residual pressure and accelerate the energy discharge, forming a hierarchical protection mechanism. If an excessively high overvoltage is triggered, the current rises sharply, and the circuit-breaking mechanism and the short-circuit mechanism work, connecting the compensation resistor while also disconnecting the small resistor to avoid excessive current burning the small resistor.

[0024] 3. The present invention discharges the capacitor through the discharge mechanism to avoid the capacitor being fully charged and affecting the judgment of the short-circuit mechanism, while also ensuring that the capacitor always maintains the function of absorbing resonant energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a transverse cross-sectional view of the present invention.

[0027] Figure 3 Schematic diagram of the structure of the resistance module of the present invention.

[0028] Figure 4 It is a front view of the resistance module of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the discharge mechanism of the present invention.

[0030] Figure 6 It is a structural cross-sectional view of the discharge mechanism of the present invention.

[0031] Figure 7 It is a schematic structural diagram of the push rod of the present invention.

[0032] The accompanying drawings are:

[0033] 1-cabinet; 2-grounding resistor; 3-compensating resistor; 4-small resistor; 5-contactor; 6-thermal relay; 7-capacitor; 8-discharge resistor; 9-spring rod; 10-push rod; 11-electromagnet; 12-spring; 13-adapter plate; 14-mounting frame; 101-insulating section; 102-magnetic section. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] Conventional nonlinear neutral grounding resistor systems consist of multiple nonlinear resistors connected in parallel, each with identical volt-ampere characteristics. Each circuit is inline with a custom fuse to ensure the proper operation of the entire valve assembly. However, nonlinear resistors are expensive, and larger capacity requires more nonlinear resistors, increasing equipment cost. Furthermore, when a large overvoltage occurs, the fuse blows. While this prevents damage to the equipment and allows the grounding system to function normally, it isolates the nonlinear resistor in that circuit, reducing the system capacity and potentially posing a safety hazard in the event of a subsequent high-voltage overvoltage.

[0038] Reference Figures 1-4 This embodiment discloses a nonlinear neutral point grounding resistor complete device, including a cabinet 1, an isolating switch, a fuse and a current transformer, and also includes a resistance module, which includes several conventional grounding parts and a transient compensation part;

[0039] The conventional grounding part includes a grounding resistor 2 and a circuit breaker mechanism connected in series. The upper end of the grounding resistor 2 is connected to the neutral point through a fuse, and the lower end of the circuit breaker mechanism is grounded. The circuit breaker mechanism is used to disconnect the circuit when the voltage is instantaneously increased.

[0040] The transient compensation unit includes a compensation resistor 3, which is used to increase the resistance value of the grounding resistor 2 during transient voltage boost. One end of the compensation resistor 3 is connected between the grounding resistor 2 of each conventional grounding unit and the circuit breaker mechanism, and the other end is grounded. A short-circuit mechanism is connected in series between the compensation resistor 3 and each grounding resistor 2. The short-circuit mechanism is used to short-circuit during transient voltage boost.

[0041] The grounding resistor 2 and the compensation resistor 3 are both non-linear resistors.

[0042] The circuit breaker mechanism includes a contactor 5 and a thermal relay 6 connected in series. When the conventional grounding part is instantaneously boosted, the resistance value of the grounding resistor 2 decreases sharply, the current of the conventional grounding part increases, and the thermal relay 6 is overloaded, causing the contactor 5 to break the circuit. The thermal relay 6 adopts a bimetallic thermal overload relay.

[0043] The short-circuit mechanism includes a capacitor 7, which is a self-healing parallel capacitor 7. The capacitor 7 blocks current normally, and the grounding resistor 2 is not connected to the compensation resistor 3. When the conventional grounding part is instantaneously boosted, the resistance value of the grounding resistor 2 decreases sharply, and the current of the conventional grounding part increases, breaking down the capacitor 7 to short-circuit the capacitor 7, and the grounding resistor 2 is connected to the compensation resistor 3.

[0044] During normal operation, the neutral point voltage is very low, the grounding resistor 2 is in a high resistance state, and the current flowing through it is very small. It is basically in an open circuit state, which is equivalent to being ungrounded. The ungrounded power supply mode has the characteristics of high reliability and good safety.

[0045] If an overvoltage is triggered, the neutral point voltage will increase at the same time, and the grounding resistor 2 will be in a conductive state, limiting the voltage within the set range, and the circuit breaker mechanism will not work;

[0046] If an excessively high overvoltage is triggered, the current rises sharply, the circuit breaker mechanism operates to open the circuit, and the short-circuit mechanism operates to short-circuit. The grounding resistor 2 is connected to the compensation resistor 3 to increase the resistance value, ensuring that the overvoltage of the system is limited to less than 2 times.

[0047] By utilizing the characteristics of nonlinear resistors and the coordination of a circuit-breaking mechanism and a short-circuiting mechanism, the present invention can both meet the requirements of stable long-term operation and rapidly respond to transient overvoltage conditions, thereby achieving a safe and reliable operation. One transient compensation unit corresponds to all conventional grounding units, reducing the number of nonlinear resistors used while still meeting safety requirements. This not only reduces equipment costs but also reduces the probability of fuse blowout when encountering large overvoltages while still meeting safety requirements. Even if a group of conventional grounding units is isolated by a blown fuse, subsequent high-overvoltage conditions can be achieved by combining grounding resistor 2 and compensation resistor 3, effectively increasing capacity instantaneously and minimizing safety risks.

[0048] Example 2

[0049] The resistance value of a nonlinear resistor decreases sharply as the voltage increases, but sometimes a certain resistance value is required between the resistor and the grounding point.

[0050] Reference Figure 3 and Figure 4 This embodiment is optimized based on the first embodiment. The conventional grounding portion further includes a small resistor 4. The rear end of the circuit breaker mechanism is connected in series with the small resistor 4 and then grounded. The small resistor 4 is a gold aluminum shell resistor with a resistance value of 5 ohms and a power of 100W, which is not easy to burn out.

[0051] If an overvoltage is triggered, the neutral point voltage will increase at the same time, and the grounding resistor 2 will be in a conducting state, limiting the voltage within the set range. The current will not be too large to burn the small resistor 4, and the circuit breaker will not work. The small resistor 4 can share part of the current, reduce the residual voltage and accelerate the energy discharge, forming a hierarchical protection mechanism.

[0052] If an overvoltage is too high, the current rises sharply and the circuit breaker works to cut off the circuit to prevent the small resistor 4 from being burned by excessive current. At the same time, the short-circuit mechanism works to short-circuit and the grounding resistor 2 is connected to the compensation resistor 3 to increase the resistance value, ensuring that the overvoltage of the system is limited to less than 2 times.

[0053] When resonance occurs, the huge energy capacity of grounding resistor 2 quickly absorbs the resonant energy, while the small resistor 4 provides additional damping. The combination of the two can effectively eliminate ferromagnetic resonance and line-break resonance overvoltage.

[0054] When a single-phase arc grounding occurs, the grounding resistor 2 absorbs the grounding charge energy and limits the arc recovery voltage in time, prompting the arc to extinguish quickly, and the small resistor 4 shortens the reignition time by discharging the residual load.

[0055] Example 3

[0056] In the technical solution of the first embodiment, the capacitor 7 will be continuously charged. After charging, it not only affects the determination of the short-circuit mechanism, but also reduces the effect of absorbing the resonance energy.

[0057] Reference Figure 5 and Figure 6 The short-circuit mechanism also includes a discharge mechanism, which is used to discharge the capacitor 7 after it is charged.

[0058] The discharge mechanism includes a discharge resistor 8 and a spring rod 9. The discharge resistor 8 is connected in parallel to the capacitor 7. One end of the discharge resistor 8 is connected to one end of the capacitor 7 through a wire, and the other end of the discharge resistor 8 is connected to the other end of the capacitor 7 through the spring rod 9. The spring rod 9 is made of elastic material. One end of the spring rod 9 is connected to the discharge resistor 8, and the other end corresponds to the terminal of the capacitor 7. The spring rod 9 swings under the elastic force, so that the discharge resistor 8 and the capacitor 7 are in short contact multiple times.

[0059] Example 4

[0060] In the third embodiment, the spring rod 9 keeps swinging, but the capacitor 7 is not always in a state that needs to be discharged. The continuous swinging of the spring rod 9 will reduce its own service life and easily cause the capacitor 7 to malfunction. Therefore, the spring rod 9 needs to work after the capacitor 7 is fully charged.

[0061] Reference Figure 5 and Figure 6This embodiment is optimized on the basis of the third embodiment, and further refines the structure of the discharge mechanism. The discharge mechanism also includes a swing mechanism, which is used to drive the spring rod 9 to swing after the capacitor 7 is charged. The swing mechanism includes a push rod 10 and an electromagnet 11. The push rod 10 is arranged on the side of the spring rod 9 close to the terminal of the capacitor 7 for horizontal translation. The push rod 10 is provided with a spring 12. The spring 12 drives the push rod 10 to translate toward the spring rod 9, so that the upper end of the spring rod 9 is separated from the terminal of the capacitor 7. The electromagnet 11 is connected in parallel with the capacitor 7 and is located away from the push rod 10. On one side of the elastic rod 9, the electromagnet 11 drives the push rod 10 to move horizontally to the side away from the elastic rod 9 after being energized; when the capacitor 7 is not charged or the charge is small, the suction force of the electromagnet 11 on the push rod 10 is less than the pulling force of the spring 12 on the elastic rod 9, and the elastic rod 9 is separated from the capacitor 7. When the capacitor 7 is fully charged or charged to a large extent, the suction force of the electromagnet 11 on the push rod 10 is greater than the pulling force of the spring 12 on the elastic rod 9, and the elastic rod 9 is hit by its own elastic force against the terminal of the capacitor 7 and keeps swinging and contacting. At the same time, the electromagnet 11 can also continue to consume the electrical energy in the capacitor 7.

[0062] Example 5

[0063] Although the swing mechanism in the fourth embodiment enables the spring rod 9 to work after the capacitor 7 is charged, the terminals of the capacitor 7 are relatively small, and the spring rod 9 is likely to miss the terminals of the capacitor 7 during the swinging process. In addition, when the electromagnet 11 drives the push rod 10 to move horizontally, the speed of the push rod 10 is sometimes not high, which cannot provide a large swinging force for the spring rod 9, reducing the number of swings of the spring rod 9, resulting in insufficient discharge of the capacitor 7.

[0064] Reference Figure 5-Figure 7 In this embodiment, the swing mechanism also includes an adapter plate 13, which is vertically arranged between the spring rod 9 and the terminal of the capacitor 7. The adapter plate 13 is connected to the terminal of the capacitor 7, and the spring rod 9 contacts the adapter plate 13 when it swings.

[0065] The push rod 10 includes an insulating section 101 and a magnetic section 102. The insulating section 101 is a flat plate made of an insulating material and is laterally slidably disposed on the adapter plate 13. The magnetic section 102 is made of a permanent magnetic material and is fixedly disposed on the side of the insulating section 101 away from the elastic rod 9.

[0066] When the capacitor 7 is not charged or the charge is small, the suction force of the electromagnet 11 on the push rod 10 is less than the sum of the pulling force of the spring 12 on the elastic rod 9 and the suction force of the magnetic section 102 on the adapter plate 13, and the elastic rod 9 is separated from the adapter plate 13. When the capacitor 7 is fully charged or charged to a large extent, the suction force of the electromagnet 11 on the push rod 10 is greater than the sum of the pulling force of the spring 12 on the elastic rod 9 and the suction force of the magnetic section 102 on the adapter plate 13, and the elastic rod 9 swings rapidly under its own elastic force to hit the adapter plate 13 and continues to swing in contact.

[0067] The adapter plate 13 is used to increase the area of ​​the capacitor 7 connected to the electric column corresponding to the elastic rod 9, ensuring that the elastic rod 9 can effectively connect to the capacitor 7 when it swings. At the same time, the suction force of the magnetic section 102 on the adapter plate 13 is a constant value. The electromagnet 11 will only drive the push rod 10 to move rapidly when the suction force on the push rod 10 is greater than a certain value, so that the elastic rod 9 has a greater swing force.

[0068] Example 6

[0069] In the above embodiment, each component is installed separately, which is not conducive to current installation and debugging.

[0070] Reference Figures 1-4 In this embodiment, the resistance module includes a mounting frame 14, and the conventional grounding portion and the transient compensation portion are fixedly installed in the mounting frame 14. A modular design is adopted, and all components of the resistance module are pre-installed in the mounting frame 14 to facilitate on-site installation and debugging.

[0071] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A nonlinear neutral point grounding resistor complete set, comprising a cabinet (1), an isolating switch, a fuse and a current transformer, characterized in that: Also included is a resistance module, the resistance module including a plurality of conventional grounding parts and a transient compensation part; The conventional grounding portion comprises a grounding resistor (2) and a circuit breaker mechanism connected in series, the upper end of the grounding resistor (2) is connected to the neutral point via a fuse, the lower end of the circuit breaker mechanism is grounded, and the circuit breaker mechanism is used to break the circuit during instantaneous voltage increase; The instantaneous compensation part includes a compensation resistor (3) which is used to increase the resistance value of the grounding resistor (2) during instantaneous voltage boosting. One end of the compensation resistor (3) is connected between the grounding resistor (2) of each conventional grounding part and the circuit breaker mechanism, and the other end is grounded. A short-circuit mechanism is connected in series between the compensation resistor (3) and each grounding resistor (2). The short-circuit mechanism is used to short-circuit during instantaneous voltage boosting. The grounding resistor (2) and the compensation resistor (3) are both non-linear resistors; The short-circuit mechanism comprises a capacitor (7), and the capacitor (7) is a liquid capacitor or a gas capacitor; The short-circuit mechanism further comprises a discharge mechanism, which is used to discharge the capacitor (7) after charging; The discharge mechanism comprises a discharge resistor (8) and a spring rod (9), wherein the discharge resistor (8) is connected in parallel to the capacitor (7), one end of the discharge resistor (8) is connected to one end of the capacitor (7) via a wire, and the other end of the discharge resistor (8) is connected to the other end of the capacitor (7) via the spring rod (9), wherein the spring rod (9) is made of an elastic material, one end of the spring rod (9) is connected to the discharge resistor (8), and the other end corresponds to the terminal of the capacitor (7); The discharge mechanism further includes a swing mechanism, which is used to drive the spring rod (9) to swing after the capacitor (7) is charged. The swing mechanism includes a push rod (10) and an electromagnet (11). The push rod (10) is arranged to be laterally translated on a side of the spring rod (9) close to the capacitor (7) terminal. The push rod (10) is provided with a spring (12). The spring (12) drives the push rod (10) to move toward the spring rod (9) so that the upper end of the spring rod (9) is separated from the capacitor (7) terminal.

2. A nonlinear neutral point grounding resistor complete set according to claim 1, characterized in that: The conventional grounding portion further comprises a small resistor (4), and the rear end of the circuit breaker mechanism is connected in series with the small resistor (4) and then grounded.

3. The nonlinear neutral point grounding resistor complete set according to claim 1, characterized in that: The circuit breaker mechanism comprises a contactor (5) and a thermal relay (6) connected in series.

4. The nonlinear neutral point grounding resistor complete set according to claim 1, characterized in that: The swing mechanism further includes an adapter plate (13), which is vertically arranged between the spring rod (9) and the terminal of the capacitor (7). The adapter plate (13) is connected to the terminal of the capacitor (7), and the spring rod (9) contacts the adapter plate (13) when swinging.

5. The nonlinear neutral point grounding resistor complete set according to claim 4, characterized in that: The push rod (10) comprises an insulating section (101) and a magnetic section (102), wherein the insulating section (101) is in the shape of a flat plate made of an insulating material, and the insulating section (101) is arranged to slide laterally on the adapter plate (13), and the magnetic section (102) is made of a permanent magnetic material and is fixedly arranged on a side of the insulating section (101) away from the elastic rod (9).

6. A nonlinear neutral point grounding resistor complete set according to any one of claims 1 to 5, characterized in that: The resistance module comprises a mounting frame (14), and the conventional grounding portion and the transient compensation portion are both fixedly mounted in the mounting frame (14).

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