Lightning arrester power frequency reference voltage test circuit and device

Abstract

The utility model relates to a lightning arrester power frequency reference voltage test circuit and device. The lightning arrester power frequency reference voltage test circuit comprises a power supply module, an inductance module and a capacitance module, the first end of the inductance module is connected with the output end of the power supply module, and the second end of the inductance module is connected with the first end of the capacitance module; the capacitor module is connected in parallel with the lightning arrester to be tested, the capacitor module comprises a capacitive component corresponding to the lightning arrester to be tested, and the capacitor module is used for keeping the resonant frequency of the lightning arrester power frequency reference voltage test circuit within a preset test range. The lightning arrester power frequency reference voltage test circuit and the lightning arrester power frequency reference voltage test device can improve the lightning arrester power frequency reference voltage test efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, in particular to a lightning arrester power frequency reference voltage test circuit and device. BACKGROUND

[0002] Lightning arrester is generally an AC gapless metal oxide lightning arrester, which uses zinc oxide resistor sheet with excellent non-linear voltage-current characteristics as the core component. The unique feature of this resistor sheet is that its resistance value will significantly decrease with the increase of applied voltage. Under the normal operating voltage of the power system, the lightning arrester maintains a high resistance state, effectively limiting the current flowing through the system. However, when the system is subjected to overvoltage impact, the resistance value of the resistor sheet decreases rapidly, thereby efficiently discharging overvoltage energy and protecting the power system from overvoltage damage. This non-linear response characteristic enables the metal oxide lightning arrester to absorb and conduct a large amount of current under high voltage impact, providing reliable overvoltage protection for the power system.

[0003] Power frequency reference voltage is one of the key parameters for measuring the performance of gapless metal oxide lightning arrester. It can directly reflect the aging and deterioration of the lightning arrester, and is an important indicator for evaluating the health status of the lightning arrester. According to the "GB 50150-2016 Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard", it is necessary to test the power frequency reference voltage of the lightning arrester to ensure that it can effectively play a role in overvoltage protection in the power system. Through testing, it can be verified whether the lightning arrester meets the design requirements, and the reliability and stability of its long-term operation can be evaluated.

[0004] The lightning arrester power frequency reference voltage test circuit in the prior art generally uses an inductive power frequency resonance test device for voltage boosting when testing the power frequency reference voltage of the lightning arrester. This device can generate a stable power frequency voltage to simulate the voltage environment of the lightning arrester in actual operation. First, connect the lightning arrester to the test device and ensure that the connection is firm and reliable. Then, start the test device and gradually increase the voltage to the specified resistive current value. In this process, the current change of the lightning arrester needs to be closely observed to ensure that it is within the normal operating range. When the current reaches the specified resistive current value, record the current voltage value. This voltage value is the power frequency reference voltage of the lightning arrester.

[0005] In the field application of the power system, especially in the handover process of electrical equipment, AC withstand voltage test is a key step to ensure the performance and safe operation of the equipment. However, due to the significant difference in capacity of various electrical equipment, the applicability of the inductive power frequency resonance test device is limited to a certain extent.

[0006] The device usually contains mechanical structures, and the size of the air gap needs to be adjusted by controlling the motor to change the size of the inductance, which is relatively complex in operation and has a relatively high failure rate. When facing high-voltage equipment, the inductance-adjustable power frequency resonance test device needs to be assembled with multiple reactors, which further increases the complexity of operation and the failure rate of the device. During assembly and disassembly, the exposed mechanical structure is easy to be damaged, affecting the test accuracy and reliability. In addition, due to the relatively low adaptability of the inductance-adjustable device, when facing electrical equipment of different capacities, multiple components may need to be replaced or adjusted to achieve the required resonance condition, which reduces the utilization rate of the device and increases the cost of manpower and resources. Utility model content

[0007] Therefore, it is necessary to provide a lightning arrester power frequency reference voltage test circuit and device capable of improving test efficiency.

[0008] In a first aspect, the present application provides a lightning arrester power frequency reference voltage test circuit, which comprises a power supply module, an inductance module and a capacitance module,

[0009] The first end of the inductance module is connected with the output end of the power supply module, and the second end of the inductance module is connected with the first end of the capacitance module; the capacitance module is connected in parallel with the lightning arrester to be tested, and the capacitance module comprises a capacitive component corresponding to the lightning arrester to be tested, and the capacitance module is used to keep the resonance frequency of the lightning arrester power frequency reference voltage test circuit within a preset test range.

[0010] In one embodiment, the lightning arrester to be tested in the lightning arrester power frequency reference voltage test circuit comprises an outdoor lightning arrester, and the capacitance module comprises a capacitive voltage transformer.

[0011] In one embodiment, the lightning arrester to be tested in the lightning arrester power frequency reference voltage test circuit comprises a tank lightning arrester, and the capacitance module comprises a gas insulated switch assembly.

[0012] In one embodiment, the capacitance module in the lightning arrester power frequency reference voltage test circuit further comprises a capacitor.

[0013] In one embodiment, the power supply module in the lightning arrester power frequency reference voltage test circuit comprises:

[0014] An alternating current power supply;

[0015] An excitation transformer, the low-voltage winding of the excitation transformer is connected with the alternating current power supply, and the output end of the high-voltage winding of the excitation transformer is connected with the first end of the inductance module.

[0016] In one of the embodiments, the inductor module in the power frequency reference voltage test circuit of the lightning arrester comprises: a reactor, a first end of the reactor is connected with an output end of the excitation transformer, and a second end of the reactor is connected with the lightning arrester to be tested and the capacitor module.

[0017] In one of the embodiments, the power frequency reference voltage test circuit of the lightning arrester further comprises: a voltage divider, the voltage divider is connected in parallel with the lightning arrester to be tested, and a first end of the voltage divider is connected with the second end of the inductor module.

[0018] In one of the embodiments, the power frequency reference voltage test circuit of the lightning arrester further comprises: a voltmeter, the voltmeter is connected in parallel with the voltage divider.

[0019] In one of the embodiments, the test range of the power frequency reference voltage test circuit of the lightning arrester is 48Hz to 62Hz.

[0020] In the second aspect, the application provides a power frequency reference voltage test device of a lightning arrester, which comprises the power frequency reference voltage test circuit of the lightning arrester according to the first aspect.

[0021] In the power frequency reference voltage test circuit and device of the lightning arrester, the power frequency reference voltage test circuit comprises: a power module, an inductor module and a capacitor module, wherein a first end of the inductor module is connected with an output end of the power module, and a second end of the inductor module is connected with a first end of the capacitor module; the capacitor module is connected in parallel with the lightning arrester to be tested, the capacitor module comprises a capacitive component corresponding to the lightning arrester to be tested, and the capacitor module is used for keeping the resonance frequency of the power frequency reference voltage test circuit of the lightning arrester within a preset test range. In this way, by using the capacitive properties of the lightning arrester to be tested and the surrounding electrical equipment as compensation capacitance, the resonance frequency of the power frequency reference voltage test circuit of the lightning arrester is adjusted to ensure that it meets the frequency requirement of the power frequency reference voltage test of the lightning arrester. The power frequency reference voltage test circuit of the lightning arrester in the embodiment can give the on-site test equipment extremely high flexibility and efficiency, can flexibly adjust the test frequency according to the actual demand, thereby eliminating the complexity and cost of separately configuring a special test device for lightning arrester test, and can improve the utilization efficiency of the on-site equipment, thereby improving the test efficiency of the power frequency reference voltage test circuit of the lightning arrester. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0023] Figure 1A structure diagram of an RLC series circuit provided for an embodiment is shown in FIG. 1.

[0024] Figure 2 A structure diagram of a power frequency reference voltage test circuit of a surge arrester provided for an embodiment is shown in FIG. 2.

[0025] Figure 3 A structure diagram of a power frequency reference voltage test circuit of a surge arrester provided for another embodiment is shown in FIG. 3. DETAILED DESCRIPTION

[0026] For the purpose of promoting an understanding of the present application, the present application will now be described in greater detail with reference to the relevant drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of the embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0028] It should be understood that the terms "first", "second" and the like used in the description and in the claims of the present application are used to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistor can be called a second resistor, and similarly, a second resistor can be called a first resistor, without departing from the scope of the present application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0029] It should be understood that "connection" in the following embodiments, if the circuits, modules, units and the like connected to each other have the transmission of electrical signals or data, should be understood as "electrical connection", "communication connection" and the like.

[0030] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "including" or "having" and the like, specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0031] It can be understood that in the module structure diagram provided in the following embodiments, "1" represents the first end of the corresponding circuit, "2" represents the second end of the corresponding circuit, and "3" represents the third end of the corresponding circuit.

[0032] Figure 1 is a structural schematic diagram of an RLC series circuit. As shown in Figure 1 , is the voltage across the circuit, is the current of the circuit, R is the resistance of the circuit, is the inductive reactance of the circuit, is the capacitive reactance of the circuit.

[0033] The impedance in the circuit is:

[0034] ;

[0035] The power supply voltage is:

[0036] .

[0037] Because:

[0038] ,

[0039] Therefore, when the frequency f in the circuit changes, the inductive reactance and the capacitive reactance also change, and the working state of the circuit also changes with the frequency change. When the circuit resonates,

[0040]

[0041] At this time, the loop frequency is:

[0042] .

[0043] It can be understood that in the variable-frequency resonant circuit, the test frequency mainly depends on the inductance L of the reactor and the capacitance C of the loop.

[0044] Figure 2 A structural schematic diagram of a power frequency reference voltage test circuit of a surge arrester is shown. As shown in Figure 2 , the power frequency reference voltage test circuit of the surge arrester provided in an embodiment includes a power supply module 100, an inductor module 200 and a capacitor module 300, wherein the first end of the inductor module is connected with the output end of the power supply module, and the second end of the inductor module is connected with the first end of the capacitor module; the capacitor module is connected in parallel with the surge arrester to be tested, the capacitor module includes a capacitive component corresponding to the surge arrester to be tested, and the capacitor module is used to keep the resonant frequency of the power frequency reference voltage test circuit of the surge arrester within a preset test range.

[0045] In Figure 2In the circuit shown, the inductance of the inductor module is L, and the total capacitance of the capacitor module is C. According to the characteristics of the RLC series circuit, when the lightning arrester power frequency reference voltage test circuit resonates, the resonance frequency is:

[0046] .

[0047] In one possible implementation, the power supply module includes: an alternating current power supply; an excitation transformer, a low-voltage winding of the excitation transformer being connected with the alternating current power supply, and an output end of a high-voltage winding of the excitation transformer being connected with a first end of the inductor module.

[0048] Among them, the alternating current power supply provides a stable alternating current and voltage, and provides input energy for the entire circuit. The output voltage of the alternating current power supply can be an industrial voltage of 220V or 380V, and the frequency corresponding to the output voltage value is fixed, usually 50Hz or 60Hz.

[0049] Among them, the excitation transformer is referred to as excitation transformer, and the working principle of the excitation transformer is based on electromagnetic induction. The turns ratio between the low-voltage winding and the high-voltage winding determines the transformation ratio, so as to raise the input lower voltage, such as 220V or 380V, to high voltage, which may reach several thousand volts or even tens of thousands of volts. The output voltage of the output end of the high-voltage winding of the excitation transformer is proportional to the transformation ratio, and the size of the output voltage can be accurately controlled by adjusting the transformation ratio of the excitation transformer, so as to obtain the test voltage required by the lightning arrester power frequency reference voltage test. The excitation transformer can also provide electrical isolation for the lightning arrester power frequency reference voltage test process, prevent the high-voltage side from affecting the low-voltage side, and thus improve the safety of the lightning arrester power frequency reference voltage test process.

[0050] As shown in Figure 2 , the alternating current power supply is boosted by the excitation transformer, and the output voltage U and the output current I of the excitation transformer high-voltage winding provide the output voltage and the output current for the inductor module. TX .

[0051] In the embodiments provided in the present application, the inductance of the high-voltage winding of the excitation transformer is mH level, and the inductance of the inductor module is H level, which is 10 3 orders of magnitude different, so the inductance of the high-voltage winding of the excitation transformer has little effect on the overall inductance of the lightning arrester power frequency reference voltage test circuit.

[0052] In one possible implementation, the inductor module includes: a reactor, a first end of the reactor being connected with the output end of the excitation transformer, and a second end of the reactor being connected with the lightning arrester to be tested and the capacitor module.

[0053] The reactor in series with the lightning arrester power frequency reference voltage test circuit can be used to limit the rapid change of current in the circuit, absorb part of the instantaneous current fluctuation, so that the voltage in the lightning arrester power frequency reference voltage test circuit is more stable, and the reactor can also filter high-frequency harmonics to avoid interference with the accuracy of the obtained power frequency reference voltage. The inductance of the reactor is fixed and cannot be adjusted, and the single inductance is usually several tens to two hundred H. Therefore, the control of the frequency mainly depends on the adjustment of the loop capacitance. The capacitance of the lightning arrester to be tested in the embodiment of the application is relatively small and can be ignored.

[0054] In Figure 2 In the lightning arrester power frequency reference voltage test circuit shown in the figure, the input end of the reactor provides an output voltage U and an output current I TX for the output end of the high-voltage winding. C The output current corresponding to the reactor is I

[0055] When selecting the reactor in the lightning arrester power frequency reference voltage test circuit, the specific site conditions need to be considered. If there are fewer capacitive components available in the capacitance module, a reactor with larger inductance can be used. On the contrary, if there are more capacitive components available in the capacitance module, the required inductance can be accurately calculated according to the capacitance properties of these capacitive components, or the switching combination of each capacitive component in the capacitance module can be determined according to the required inductance. In addition, the rated voltage, current and thermal stability of the reactor also need to be considered to ensure that it can withstand the voltage and current load in the lightning arrester power frequency reference voltage test process.

[0056] In one possible implementation, the lightning arrester power frequency reference voltage test circuit further includes a voltage divider, which is connected in parallel with the lightning arrester to be tested, and the first end of the voltage divider is connected with the second end of the inductance module.

[0057] The voltage divider is used to divide the high-voltage signal output by the second end of the inductance module into a lower signal, so that the measuring instrument can safely and stably read.

[0058] For example, a voltage divider can consist of the following main parts: a high-voltage resistor or capacitor section, located at the high-voltage end of the voltage divider, which withstands high voltage and is used to decompose a portion of the high voltage and guide it to the low-voltage section. A resistive voltage divider uses high-resistance resistors in series to divide the voltage, while a capacitive voltage divider utilizes the reactance of a capacitor to achieve voltage division; a low-voltage resistor or capacitor section, located at the low-voltage end of the voltage divider, connected in series with the high-voltage section, whose resistance or capacitance value is designed proportionally to that of the high-voltage section, used to decompose the high-voltage signal into a measurable range; a protective structure, including insulating media such as epoxy resin, insulating oil, and a shielding cover, used to prevent electric shock and leakage, and to ensure the safe operation of the voltage divider, especially in high-voltage environments; output terminals, located at the low-voltage end, used to connect measuring equipment, such as oscilloscopes, voltmeters, or digital acquisition devices; and a housing, typically made of metal or insulating material, providing mechanical protection and electrical shielding.

[0059] In one possible implementation, such as Figure 2 As shown, the voltage divider is a capacitive voltage divider. The first terminal of the high-voltage capacitor section is connected to the second terminal of the inductor module and also to one end of the surge arrester under test. The second terminal of the high-voltage capacitor section is connected to the first terminal of the low-voltage capacitor section of the voltage divider, and the second terminal of the low-voltage capacitor section is grounded. The capacitance of the voltage divider is typically several thousand pF. The surge arrester power frequency reference voltage test circuit also includes a voltmeter, which is connected in parallel with the voltage divider.

[0060] In this circuit, a voltmeter can be connected in parallel with the low-voltage capacitor section of the voltage divider to obtain the measured voltage corresponding to the low-voltage capacitor section of the voltage divider in the surge arrester power frequency reference voltage test circuit. Based on the measured voltage and the proportional coefficient of the voltage divider, the voltage across the surge arrester under test can be calculated, and thus the power frequency reference voltage of the surge arrester under test can be determined.

[0061] For example, suppose a surge arrester power frequency reference voltage test circuit has the following parameters: the inductor module includes a single reactor with an inductance of 200H, and the voltage divider capacitance is 3000pF. Then, the resonant frequency of the surge arrester power frequency reference voltage test circuit at resonance is approximately 205Hz. However, this is far from the test range required for surge arrester power frequency reference voltage testing.

[0062] In one possible implementation, the resonant frequency of the surge arrester power frequency reference voltage test circuit corresponds to a test range of 48Hz to 62Hz.

[0063] Figure 3 A schematic diagram of a surge arrester power frequency reference voltage test circuit provided in one embodiment of this application is shown. (See also...) Figure 3 In one possible implementation, the surge arrester under test includes an outdoor surge arrester, and the capacitor module includes a capacitive voltage transformer. In this implementation, Figure 3The compensation device in the above-mentioned is a capacitance type voltage transformer.

[0064] The outdoor type surge arrester is composed of a surge arrester core, which can be a zinc oxide varistor; an insulating sheath, such as a silicone rubber or a porcelain sheath; a top cover and a base. The outdoor type surge arrester is usually directly exposed to the environment, and relies on its own insulating sheath to isolate from the environment. Under normal operating voltage, the zinc oxide varistor in the surge arrester shows a high resistance state. When an overvoltage occurs, the zinc oxide varistor rapidly reduces the resistance value, discharges the overvoltage to the ground, and limits the amplitude of the overvoltage. After the overvoltage disappears, the zinc oxide varistor returns to the high resistance state. For the outdoor type surge arrester, a capacitance type voltage transformer (CVT) bypassed therefrom can be used to achieve compensation of the capacitance. The CVT itself contains a voltage dividing capacitor and an inductive winding, and can be used as part of a surge arrester power frequency reference voltage test circuit to provide an additional capacitance value.

[0065] In a possible implementation, the surge arrester to be tested comprises a tank type surge arrester, and the capacitance module comprises a gas insulated switchgear (GIS) assembly. In this implementation, Figure 3 The compensation device in the above-mentioned is a GIS assembly.

[0066] The tank type surge arrester is a product matched with a gas insulated switchgear. Usually, the tank type surge arrester is installed at the transformer end of a GIS bus and a transformer directly connected to the GIS pipeline. The internal core of the tank type surge arrester is also a zinc oxide varistor, but is packaged in a metal tank filled with SF6 gas (sulfur hexafluoride). Usually integrated with the GIS in the same closed structure, these components are packaged in a metal housing filled with SF6 gas, and are used to achieve functions such as breaking, isolation, protection and measurement of high voltage power. The GIS has the characteristics of compactness, reliability, high insulation performance, etc., and is widely used in high voltage and extra-high voltage power systems, especially in space-limited substations or environments with high requirements. The GIS assembly in the substation can include circuit breakers, disconnectors, grounding switches, current transformers, and voltage transformers. For example, when the GIS assembly is used for compensation, the number of GIS segments used for compensation can be adjusted by controlling the opening and closing state of the circuit breaker, and then the total capacitance is adjusted to achieve the desired compensation effect.

[0067] In a possible implementation, the capacitance module further comprises a capacitor. If there is no capacitive component around the surge arrester to be tested that can be used for compensation of the capacitance, or the capacitance of the capacitive component is insufficient for capacitance compensation, and the resonant frequency of the surge arrester power frequency reference voltage test circuit needs to be maintained within a preset test range, then the independently equipped capacitor will become a necessary compensation approach. In this implementation, Figure 3The compensation device in the above-mentioned embodiment is a capacitor. The capacitor in the embodiment should consider factors such as voltage withstand level, capacity error and resonant frequency to ensure that it can meet the test requirements.

[0068] Optionally, Figure 3 The compensation device in the above-mentioned embodiment is other electrical equipment near the lightning arrester to be tested, and the withstand voltage level of the compensation device must exceed the power frequency reference voltage specified for the lightning arrester to be tested.

[0069] In the embodiment, the capacitance properties of the lightning arrester to be tested and the surrounding electrical equipment are used as compensation capacitance to adjust the resonant frequency of the lightning arrester power frequency reference voltage test circuit, so as to ensure that it meets the frequency requirements of the lightning arrester power frequency reference voltage test. The lightning arrester power frequency reference voltage test circuit in the embodiment can give the on-site test equipment extremely high flexibility and efficiency, and can flexibly adjust the test frequency according to actual needs, thereby eliminating the cumbersome and cost of separately configuring special test equipment for lightning arrester testing, and improving the utilization efficiency of on-site equipment, thereby improving the test efficiency of the lightning arrester power frequency reference voltage test circuit.

[0070] In an exemplary embodiment, the lightning arrester to be tested and the compensation device are correctly connected according to the lightning arrester power frequency reference voltage test circuit provided in the above-mentioned embodiment, and the voltage is started after the connection is checked. During the connection process, it should be ensured that the connection between all devices is firm and reliable to avoid measurement errors or device damage caused by poor contact.

[0071] According to the provisions of the lightning arrester technical conditions, when the voltage is applied to the resistive current to reach the specified value, the voltage value at this time is recorded, which is the power frequency reference voltage of the lightning arrester. During the measurement process, the accuracy and accuracy of the voltmeter and other measuring devices should be ensured to ensure the reliability of the measurement results. At the same time, attention should also be paid to the state of the lightning arrester to be tested during the test process, such as whether there is abnormal sound, discharge phenomenon, etc., so as to timely discover and handle potential problems.

[0072] The embodiment in the application also provides a lightning arrester power frequency reference voltage test device, which comprises the lightning arrester power frequency reference voltage test circuit provided in the above-mentioned embodiment.

[0073] In one of the embodiments, the lightning arrester to be tested in the lightning arrester power frequency reference voltage test circuit comprises an outdoor lightning arrester, and the capacitance module comprises a capacitive voltage transformer.

[0074] In one of the embodiments, the lightning arrester to be tested in the lightning arrester power frequency reference voltage test circuit comprises a tank lightning arrester, and the capacitance module comprises a gas insulated switch assembly.

[0075] In one of the embodiments, the capacitance module in the lightning arrester power frequency reference voltage test circuit further comprises a capacitor.

[0076] In one of the embodiments, the power module in the power frequency reference voltage test circuit of the lightning arrester comprises: an AC power supply; an excitation transformer, a low-voltage winding of the excitation transformer being connected with the AC power supply, and an output end of a high-voltage winding of the excitation transformer being connected with a first end of an inductor module.

[0077] In one of the embodiments, the inductor module in the power frequency reference voltage test circuit of the lightning arrester comprises: a reactor, a first end of the reactor being connected with an output end of the excitation transformer, and a second end of the reactor being connected with the lightning arrester to be tested and a capacitor module.

[0078] In one of the embodiments, the power frequency reference voltage test circuit of the lightning arrester further comprises: a voltage divider, the voltage divider being connected in parallel with the lightning arrester to be tested, and a first end of the voltage divider being connected with a second end of the inductor module.

[0079] In one of the embodiments, the power frequency reference voltage test circuit of the lightning arrester further comprises: a voltmeter, the voltmeter being connected in parallel with the voltage divider.

[0080] In one of the embodiments, the test range of the power frequency reference voltage test circuit of the lightning arrester is 48Hz to 62Hz.

[0081] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", "ideal embodiments", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0082] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present specification.

[0083] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A power frequency reference voltage test circuit for a surge arrester, characterized by, The power frequency reference voltage test circuit of the lightning arrester comprises a power module, an inductor module and a capacitor module, The first end of the inductor module is connected with the output end of the power module, and the second end of the inductor module is connected with the first end of the capacitor module; the capacitor module is connected in parallel with the lightning arrester to be tested, the capacitor module comprises a capacitive component corresponding to the lightning arrester to be tested, and the capacitor module is used for keeping the resonance frequency of the power frequency reference voltage test circuit of the lightning arrester within a preset test range.

2. The power frequency reference voltage test circuit for a surge arrester according to claim 1, characterized by, The lightning arrester to be tested comprises an outdoor lightning arrester, and the capacitor module comprises a capacitive voltage transformer.

3. The power frequency reference voltage test circuit for a surge arrester of claim 1, wherein, The lightning arrester to be tested comprises a tank lightning arrester, and the capacitor module comprises a gas insulated switch assembly.

4. The power frequency reference voltage test circuit for a surge arrester according to any one of claims 1 to 3, characterized in that, The capacitor module further comprises a capacitor.

5. The power frequency reference voltage test circuit for a surge arrester of claim 1, wherein, The power module comprises: an alternating current power supply; an excitation transformer, a low-voltage winding of the excitation transformer being connected with the alternating current power supply, and an output end of a high-voltage winding of the excitation transformer being connected with the first end of the inductor module.

6. The power frequency reference voltage test circuit for a surge arrester of claim 5, wherein, The inductor module comprises a reactor, a first end of the reactor being connected with the output end of the excitation transformer, and a second end of the reactor being connected with the lightning arrester to be tested and the capacitor module.

7. The power frequency reference voltage test circuit for a surge arrester of claim 1, wherein, The power frequency reference voltage test circuit of the lightning arrester further comprises a voltage divider connected in parallel with the lightning arrester to be tested, and a first end of the voltage divider being connected with the second end of the inductor module.

8. The power frequency reference voltage test circuit for a surge arrester according to claim 7, characterized by, The power frequency reference voltage test circuit of the lightning arrester further comprises a voltmeter connected in parallel with the voltage divider.

9. The power frequency reference voltage test circuit for a surge arrester of claim 1, wherein, The test range is 48Hz to 62Hz.

10. A power frequency reference voltage testing device for a surge arrester, characterized in that, The power frequency reference voltage test device of the lightning arrester comprises the power frequency reference voltage test circuit of the lightning arrester according to any one of claims 1 to 9.

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