State Monitoring Method and System for Series Current Limiting Reactor Based on Bypass Leakage Current

Abstract

Method and system for monitoring the state of a series current-limiting reactor based on bypass leakage current. A current sensor is used in the bypass to collect the bypass leakage current of the series reactor. Based on the bypass leakage current and by comprehensively using the in-station line current signal, an orthogonal decomposition method is used to estimate the terminal voltage vector of the series reactor and the current vector of the series reactor. According to the estimation of the reactor terminal voltage vector and the reactor current vector, the self-impedance of the reactor is calculated to determine the operating state of the reactor. The present invention can achieve non-invasive online monitoring and fault diagnosis of large-capacity series current-limiting reactors.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system equipment status monitoring, and particularly relates to a method and system for monitoring the status of a series current-limiting reactor based on bypass leakage current. Background Art

[0002] In a 500 kV extra-high voltage power grid, a series current-limiting reactor is a core device for limiting short-circuit current. To meet the requirements of line planning parameters, multiple reactor monomers are usually connected in series to form a complete set of devices to meet the series impedance requirements. At the same time, the series current-limiting reactor is also equipped with auxiliary devices such as coupling capacitors, voltage-limiting arresters, and GIS circuit breakers to achieve over-voltage protection and flexible access of equipment.

[0003] However, the series current-limiting reactor itself faces risks of faults such as inter-turn short circuits and winding deformations during operation, which may lead to equipment damage and even introduce system operation risks. In the prior art, typical monitoring methods for inter-turn short circuits of reactors, such as vibration signal analysis and temperature rise detection, require additional sensors to be installed or shutdown for maintenance, and are complex in operation and poor in real-time performance. In particular, for 500 kV large-capacity current-limiting reactors, the large structural size increases the difficulty of sensor layout, and the strong coil leakage magnetic field will also cause obvious interference to the sensors.

[0004] In fact, due to the need to suppress transient over-voltages, existing series current-limiting reactors usually have bypass arresters in parallel, and their leakage current contains rich equipment status information. Specifically, the resistance component in the arrester leakage current is directly related to the status of the arrester itself, and the capacitance component is directly related to the reactor terminal voltage. However, there is currently no research on the status monitoring of series reactors based on the information of bypass arrester leakage current.

[0005] Therefore, there is an urgent need for a method for monitoring the status of large-capacity series reactors that can reduce monitoring costs and potential safety hazards. Summary of the Invention

[0006] To address the deficiencies in the existing technologies, the present invention provides a method and system for monitoring the state of series current-limiting reactors based on bypass leakage current, enabling non-intrusive on-line monitoring and fault diagnosis of large-capacity series current-limiting reactors. The present invention mainly includes the following aspects: 1) Monitoring the leakage current of bypass arresters to non-intrusively obtain the voltage parameters of series reactors, and introducing a wireless power supply module to avoid installing additional sensors or additional power supply wiring, significantly reducing the monitoring cost and potential safety hazards; 2) Using orthogonal decomposition technology to eliminate the interference of the resistive component of the leakage current, and taking the capacitive component of the arrester leakage current as the core parameter to ensure that the reactor monitoring is not affected by the deterioration of the arrester itself and enhancing the robustness of the monitoring results; 3) Combining the series line current and the capacitive component of the leakage current of the shunt arrester of the reactor to obtain the power factor parameter of each reactor body, realizing the monitoring of the operating state of individual reactors.

[0007] The present invention adopts the following technical solutions.

[0008] The present invention provides a method for monitoring the state of series current-limiting reactors based on bypass leakage current. The series current-limiting reactor is composed of N sections of reactors connected in series. The monitoring method includes:

[0009] S1, setting a line current sensor on the line in the station where the series current-limiting reactor is located to measure the line current ; setting a leakage current sensor on the arrester branch parallel to each section of the series reactor to measure the bypass leakage current of each section of the series reactor ; Denote the measured value of the bypass leakage current of the th section of the series reactor;

[0010] S2, based on the bypass leakage current of each section of the series reactor, combining the line current in the station, estimating the phase angle of the voltage vector of each section of the series reactor terminal voltage, and the current vector of the series reactor; 、 respectively denote the estimated values of the voltage vector of the th section of the series reactor and the current vector of the reactor;

[0011] S3, according to the phase angle of the voltage vector estimated for each section of the series reactor terminal, the bypass leakage current vector and the reactor current vector, calculating the self-impedance value of each section of the series reactor;

[0012] S4, combining the impedance values of K sections of reactors to determine whether the series reactor is abnormal.

[0013] Further, step S2 specifically includes:

[0014] S201, Estimate the inductance current vector of the series reactor, and calculate the terminal voltage vector of the series reactor based on the inductance current vector and the phase angle;

[0015] S202, Take the phase angle of the terminal voltage vector of the series reactor as the orthogonal decomposition reference, decompose the bypass leakage current vector of the series reactor, and obtain the capacitive component and resistive component of the parallel bypass leakage current of the series reactor;

[0016] S203, Use the capacitive component vector of the parallel bypass leakage current to obtain the estimated value of the terminal voltage vector of the series reactor and the estimated value of the current vector of the series reactor after coordinate transformation.

[0017] Furthermore, step S201 specifically includes:

[0018] For the k-th section of the series reactor, ignore the self-resistance of the reactor, and set the inductance current vector to be the same as the in-station line current vector;

[0019] According to the voltage-current relationship of the inductor, we have:

[0020] ;

[0021] Wherein, is the vector form of the terminal voltage of the series reactor , is the vector form of the inductance current of the series reactor , is the inductance value of the k-th series reactor.

[0022] Furthermore, the specific steps of S202 include:

[0023] Let be the bypass leakage current vector, be the leading angle of the initial phase of the in-station line current, adjust the coordinate system so that the phase angle of the inductance voltage is 0 degrees, that is, multiply the vector by the coefficient ;

[0024] Then, coincides with the positive semi-axis of the real axis of the coordinate axis, and the imaginary part is zero; coincides with the negative semi-axis of the imaginary axis of the coordinate axis, and the real part is zero; Take the phase angle of the terminal voltage vector of the series reactor as the orthogonal decomposition reference;

[0025] Decompose the bypass leakage current vector of the series reactor to obtain:

[0026] ;

[0027] Wherein, is the shunt bypass leakage current of the series reactor, is the capacitive component of the shunt bypass leakage current of the series reactor, is the resistive component of the shunt bypass leakage current of the series reactor;

[0028] After the coordinate axis rotation, the real-axis part of the bypass leakage current vector corresponds to the resistive component, and the imaginary-axis part corresponds to the capacitive component, that is

[0029] ;

[0030] Among them, is the capacitive component vector of the shunt bypass leakage current of the series reactor, is the shunt bypass leakage current vector of the series reactor, is the leading angle of the initial phase of the in-station line current.

[0031] Furthermore, the specific steps of S203 include:

[0032] The inductor terminal voltage vector after coordinate transformation:

[0033] ;

[0034] And the inductor current vector after coordinate transformation:

[0035] ;

[0036] Among them, is the angular frequency of the power system, is the value of the bypass equivalent capacitance, is the shunt bypass leakage current vector in parallel at both ends of the th reactor, is the leading angle of the initial phase of the in-station line current, is the in-station line current vector, , is the total number of series reactors.

[0037] Furthermore, the impedance calculation formula is:

[0038] ;

[0039] Among them, is the reactance impedance of the th reactor, is the angular frequency of the power system, is the value of the bypass equivalent capacitance, is the shunt bypass leakage current vector in parallel at both ends of the th reactor, is the leading angle of the initial phase of the in-station line current, is the in-station line current vector, , is the number of reactors connected in series in total;

[0040] Let the average reactance impedance corresponding to the series reactors be denoted as and the minimum resistance impedance among the series reactors be denoted as Let the average impedance of each section of the series reactor during normal operation in the historical period be denoted as

[0041] ;

[0042] wherein, represents the trend fluctuation parameter, represents the sensitivity coefficient, which is set according to the actual situation; when ≥10%, it is determined that the series reactor is abnormal.

[0043] The present invention also provides a state monitoring system for a series current-limiting reactor based on bypass leakage current, including a wireless power supply module, a signal acquisition module, an orthogonal decomposition module, and a reactor state evaluation module, characterized in that:

[0044] The wireless power supply module is divided into a ground part and a detection part, wherein the ground part is connected to the station power supply to realize wireless power supply and wireless communication from the ground part to the detection part;

[0045] The signal acquisition module is integrated inside the leakage current sensor in the bypass and is installed on the arrester base;

[0046] The orthogonal decomposition module estimates the reactor terminal voltage and reactor current parameters based on the bypass leakage current collected by itself and the in-station line current signal;

[0047] The reactor state evaluation module calculates the self-impedance of the reactor based on the voltage and current vectors calculated by the orthogonal decomposition module and determines whether the reactor is abnormal.

[0048] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the computer program is loaded into the processor, it implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current described above.

[0049] The present invention also provides a computer-readable storage medium storing a computer program, which when executed by a processor, implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current as described above.

[0050] The present invention also provides a computer program product including computer instructions for causing a computer to execute the method for monitoring the state of a series current-limiting reactor based on bypass leakage current as described above.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] 1) By monitoring the leakage current of the bypass arrester, the voltage parameters of the series reactor are obtained non-invasively, and a wireless power supply module is introduced to avoid installing additional sensors or additional power supply wiring, significantly reducing the monitoring cost and safety hazards.

[0053] 2) The orthogonal decomposition technology is used to eliminate the interference of the resistive component of the leakage current, and the capacitive component of the arrester leakage current is used as the core parameter to ensure that the reactor monitoring is not affected by the deterioration of the arrester itself and enhance the robustness of the monitoring results.

[0054] 3) By comprehensively considering the series line current and the capacitive component of the leakage current of the reactor shunt arrester, the power factor parameter of each reactor body is obtained to realize the monitoring of the operation state of the individual reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a flowchart of the method for monitoring the state of a series current-limiting reactor based on bypass leakage current of the present invention;

[0056] Figure 2 is an installation schematic diagram of the method for monitoring the state of a series current-limiting reactor based on bypass leakage current of the present invention;

[0057] Figure 3 is a schematic diagram of an equivalent mathematical model of the method for monitoring the state of a series current-limiting reactor based on bypass leakage current of the present invention;

[0058] Figure 4 is a system flowchart block diagram of the system for monitoring the state of a series current-limiting reactor based on bypass leakage current of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0060] The present invention proposes a method for monitoring the state of a series current-limiting reactor based on bypass leakage current, as Figure 1 shown. The series current-limiting reactor is composed of K sections of reactors connected in series. The specific steps are as follows.

[0061] S1. Install a line current sensor on the line in the station where the series current-limiting reactor is located to measure the line current ; install a leakage current sensor on the arrester branch parallel to each section of the series reactor to measure the bypass leakage current of each section of the series reactor ; denotes the measured value of the bypass leakage current of the th section of the series reactor.

[0062] The leakage current of the arrester connected in parallel to the bypass of the series current-limiting reactor contains rich equipment state information. By using a current sensor to collect this leakage current, key data related to the reactor can be obtained in a non-intrusive manner. Compared with the traditional monitoring method that requires installing additional sensors or shutting down for maintenance, this method is simple to operate and has strong real-time performance. By continuously collecting the leakage current, its changes can be captured in a timely manner, providing raw data for subsequent analysis and helping to quickly detect possible problems with the reactor.

[0063] Wireless power supply is provided for the series current-limiting reactor, including a ground part and a detection part; the ground part is connected to the station power supply to achieve wireless power supply and wireless communication from the ground part to the detection part; the installation schematic diagram is as Figure 2 shown.

[0064] By connecting the ground part to the station power supply to provide wireless power supply and communication to the detection part, the installation of additional sensors and complex power supply wiring are avoided. This not only significantly reduces the monitoring cost, reduces the investment in hardware equipment and wiring cost, but also eliminates the safety hazards brought by installing additional equipment. In the 500 kV ultra-high voltage power grid, reducing the installation of additional sensors can avoid monitoring errors caused by difficult sensor layout and interference from coil leakage magnetic field, ensure the stable operation of the monitoring system, and lay a foundation for accurately monitoring the state of the reactor subsequently.

[0065] S2. Based on the bypass leakage current of each section of the series reactor, and integrating the line current in the station, estimate the terminal voltage vector of each section of the series reactor The phase angle, and the current vector of the series reactor ; 、 respectively represent the estimated values of the terminal voltage vector and the reactor current vector of the k-th segment of the series reactor. The specific steps are as follows:

[0066] S201. For the k-th segment of the series reactor, ignoring the self-resistance of the reactor, consider the following relationship:

[0067] ;

[0068] where, is the angular frequency of the power system, is the inductance value of the series reactor, is the equivalent capacitance of the parallel bypass of the series reactor, is the equivalent resistance of the parallel bypass of the series reactor, is the total number of series-connected reactors, is the capacitance value of the coupling capacitor;

[0069] Therefore, there is an inductance current vector:

[0070] ;

[0071] where, is the vector form of the inductance current of the series reactor of, is the vector form of the in-station line current of.

[0072] According to the voltage-current relationship of the inductor, there is:

[0073] ;

[0074] where, is the vector form of the terminal voltage of the series reactor of, is the vector form of the inductance current of the series reactor of, is the inductance value of the k-th series reactor.

[0075] S202. In order to use the inductance voltage as the orthogonal decomposition reference, let be the bypass leakage current vector, be the leading angle of the initial phase of the in-station line current, adjust the coordinate system so that the phase angle of the inductance voltage is 0 degrees, that is, multiply the vector by the coefficient ;

[0076] Then, coincides with the positive half-axis of the real axis of the coordinate axis, and the imaginary part is zero; coincides with the negative semi-axis of the imaginary axis of the coordinate axis and has a real part of zero; the phase angle of the terminal voltage vector of the series reactor is used as the reference for orthogonal decomposition;

[0077] Decompose the bypass leakage current vector of the series reactor to obtain:

[0078] ;

[0079] where, is the parallel bypass leakage current of the series reactor, is the capacitive component of the parallel bypass leakage current of the series reactor, is the resistive component of the parallel bypass leakage current of the series reactor;

[0080] After the coordinate axis rotation, the real-axis part of the bypass leakage current vector corresponds to the resistive component, and the imaginary-axis part corresponds to the capacitive component, that is

[0081] ;

[0082] where, is the capacitive component vector of the parallel bypass leakage current of the series reactor, is the parallel bypass leakage current vector of the series reactor, is the leading angle of the initial phase angle of the in-station line current.

[0083] S203, the inductor terminal voltage vector after coordinate transformation:

[0084] ;

[0085] And the inductor current vector after coordinate transformation:

[0086] ;

[0087] where, is the angular frequency of the power system, is the value of the bypass equivalent capacitance, is the th bypass leakage current vector in parallel at both ends of the reactor, is the leading angle of the initial phase angle of the in-station line current, is the in-station line current vector, , is the number of all series-connected reactors.

[0088] By using the orthogonal decomposition method to decompose the arrester leakage current vector with the voltage vector at both ends of the series reactor as the reference, the interference of the resistive component of the leakage current can be effectively eliminated, and the capacitive component directly related to the reactor terminal voltage can be extracted. Taking the capacitive component as the core parameter and combining the in-station line current signal to estimate the reactor terminal voltage vector and current vector ensures that the monitoring result is not affected by the deterioration of the arrester itself, enhancing the robustness of the monitoring result. Even if problems such as aging occur in the arrester, it does not affect the accurate assessment of the reactor status, making the monitoring more reliable.

[0089] S4. According to the reactor terminal voltage vector and the reactor current vector, calculate the impedance of the reactor itself. When the impedance parameter shows an obvious trend change, it indicates that the reactor is abnormal; the system flow block diagram is as Figure 4 shown. The impedance calculation formula is:

[0090] ;

[0091] Among them, is the th reactance impedance, is the angular frequency of the power system, is the value of the bypass equivalent capacitance, is the th bypass leakage current vector in parallel at both ends of the reactor, is 90 degrees ahead of the initial phase angle of the in-station line current, is the in-station line current vector, , is the total number of series reactors.

[0092] Denote the average reactance impedance corresponding to series reactors as , denote the minimum resistance impedance among series reactors as , and denote the average impedance of each section of series reactors during normal operation in the historical period as , then:

[0093] ;

[0094] Among them, represents the trend fluctuation parameter, represents the sensitivity coefficient, which is set according to the actual situation; when ≥10%, it is judged that the series reactor is abnormal. In order to ensure avoiding misjudgment while having enough sensitivity to capture the effective abnormal changes in the reactor status, the value range of is set between [1, 3]. Within this range, when the impedance value of the reactor does not change particularly violently, a smaller Values, such as 1 or 1.5, where the difference in the resistance of each reactor in the system is small, and an excessive power exponent will cause an overresponse and result in misjudgment; when the impedance value of the reactor changes significantly but is still within an acceptable range, = 2 can be selected, which gives a greater "amplification effect" to the impedance difference of the reactor, making the system more sensitive to larger deviations and not overly responsive to minor differences; when extreme faults occur in the reactor or the impedance difference is particularly significant, a larger can enhance the detection ability for these anomalies. For example, when = 3, in this case, the response to the abnormal reactor will be very sensitive, and it can quickly judge and respond to the abnormal reactor.

[0095] Calculate the self-impedance of the reactor based on the estimated voltage and current vectors, and judge whether the reactor is abnormal by setting the trend fluctuation parameter. This method realizes the precise monitoring of the operation state of individual reactors. Comparing and analyzing the average reactance impedance and the minimum resistance impedance of multiple series reactors can keenly detect the change trend of the reactor impedance. Once the trend fluctuation parameter exceeds 10%, potential faults existing in the reactor can be detected in time. For example, inter-turn short circuits will cause changes in the reactor impedance, thus realizing the early diagnosis of faults and ensuring the safe and stable operation of the power grid.

[0096] The present invention also proposes a series current-limiting reactor state monitoring system based on bypass leakage current, including a wireless power supply module, a signal acquisition module, an orthogonal decomposition module, and a reactor state evaluation module, as shown in Figure 4 Figure 4 as follows:

[0097] The wireless power supply module is divided into a ground part and a detection part. The ground part is connected to the station service power, and ultrasonic or microwave power supply technology, etc. is used to realize wireless power supply and wireless communication from the ground part to the detection part;

[0098] The signal acquisition module is integrated inside the bypass leakage current sensor and installed on the arrester base;

[0099] The orthogonal decomposition module estimates the terminal voltage and current parameters of the reactor based on the bypass leakage current collected by itself and the line current signal in the station;

[0100] The reactor state evaluation module calculates the self-impedance of the reactor according to the voltage and current vectors calculated by the orthogonal decomposition module. When the impedance parameter changes significantly in trend, it indicates that the reactor is abnormal.

[0101] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the computer program is loaded into the processor, it implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current as described above.

[0102] The present invention also provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, it implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current as described above.

[0103] The present invention also provides a computer program product comprising computer instructions for causing a computer to execute the method for monitoring the state of a series current-limiting reactor based on bypass leakage current as described above.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A method for monitoring the state of a series current-limiting reactor based on bypass leakage current, wherein the series current-limiting reactor is formed by connecting K sections of reactors in series, and is characterized in that, The monitoring method includes: S1. Install a line current sensor on the in-station line where the series current-limiting reactor is located to measure the line current ; Install a leakage current sensor on the arrester branch parallel to each section of the series reactor to measure the bypass leakage current of each section of the series reactor ; Denote the measured value of the bypass leakage current of the S2, based on the bypass leakage current of each series reactor , combined with the line current in the substation , estimate the phase angle of the voltage vector at the end of each series reactor , as well as the current vector of the series reactor ; 、 respectively represent the estimated values of the voltage vector at the end of the series reactor in the S3. Based on the phase angle of the estimated voltage vector, the bypass leakage current vector, and the reactor current vector at each end of the series reactor, calculate the self-impedance value of each section of the series reactor. S4. Comprehensive the impedance values of K sections of reactors to determine whether the series reactor is abnormal.

2. The method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to claim 1, wherein: Step S2 specifically includes: S201, estimate the inductance current vector of the series reactor, and calculate the terminal voltage vector of the series reactor based on the inductance current vector and the phase angle thereof; S202, taking the phase angle of the terminal voltage vector of the series reactor as the orthogonal decomposition reference, decompose the bypass leakage current vector of the series reactor to obtain the capacitive component and the resistive component of the parallel bypass leakage current of the series reactor; S203. Utilize the capacitive component vector of the parallel bypass leakage current to obtain the estimated values of the series reactor terminal voltage vector and the series reactor current vector after coordinate transformation.

3. The method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to claim 2, wherein: Step S201 specifically includes: For the k-th section of the series reactor, ignore the self-resistance of the reactor and set the inductive current vector to be the same as the in-station line current vector. According to the voltage-current relationship of the inductor, there is: ； Among them, is the vector form of the terminal voltage of the series reactor , is the vector form of the inductive current of the series reactor , is the inductance value of the k-th series reactor.

4. The method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to claim 2, wherein: The specific steps of S202 include: Let be the bypass leakage current vector, be the leading angle of the initial phase angle of the in-station line current. Adjust the coordinate system so that the phase angle of the inductor voltage is 0 degrees, that is, multiply the vector by the coefficient ; Then, coincides with the positive real axis of the coordinate axis and has a zero imaginary part; coincides with the negative imaginary axis of the coordinate axis and has a zero real part; the phase angle of the terminal voltage vector of the series reactor is used as the orthogonal decomposition reference; Decompose the bypass leakage current vector of the series reactor to obtain: ； Among them, is the shunt bypass leakage current of the series reactor, is the capacitive component of the shunt bypass leakage current of the series reactor, is the resistive component of the shunt bypass leakage current of the series reactor; After the coordinate axes are rotated, the real-axis part of the bypass leakage current vector corresponds to the resistive component, and the imaginary-axis part corresponds to the capacitive component, that is ； Among them, is the capacitive component vector of the parallel bypass leakage current of the series reactor, is the parallel bypass leakage current vector of the series reactor, is the leading angle of the initial phase angle of the in-station line current.

5. The method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to claim 2, wherein: The specific steps of S203 include: The inductive terminal voltage vector after coordinate transformation: ； And the inductive current vector after coordinate transformation: ； Among them, is the angular frequency of the power system, is the bypass equivalent capacitance value, is the vector of the bypass leakage current shunted across the two ends of the th reactor, is the leading angle of the initial phase of the in-station line current, is the vector of the in-station line current, , is the number of all series-connected reactors.

6. The method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to claim 1, wherein: The impedance calculation formula is: ； Among them, is the th reactance impedance, is the angular frequency of the power system, is the value of the bypass equivalent capacitance, is the th bypass leakage current vector in parallel at both ends of the reactor, is the leading angle of the initial phase of the in-station line current, is the in-station line current vector, , is the number of reactors connected in series in total; Denote the average reactance impedance corresponding to the series reactors as ; denote the minimum resistance impedance among the series reactors as ; denote the average impedance during normal operation of each section of series reactors in the historical period as ; then: ； Among them, represents the trend fluctuation parameter, represents the sensitivity coefficient, which is set according to the actual situation; when ≥ 10%, it is determined that the series reactor is abnormal.

7. A state monitoring system for a series current-limiting reactor based on bypass leakage current using the method according to any one of claims 1-6, comprising a wireless power supply module, a signal acquisition module, an orthogonal decomposition module, and a reactor state evaluation module, wherein: The wireless power supply module is divided into a ground part and a detection part, wherein the ground part is connected to the station power supply to realize wireless power supply and wireless communication from the ground part to the detection part. The signal acquisition module is integrated inside the bypass leakage current sensor and installed on the arrester base. The orthogonal decomposition module estimates the reactor terminal voltage and the reactor current parameters based on the bypass leakage current collected by itself and the in-station line current signal. The reactor state evaluation module calculates the self-impedance of the reactor based on the voltage and current vectors calculated by the orthogonal decomposition module and determines whether the reactor is abnormal.

8. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to any one of claims 1-6.

10. A computer program product, characterized in that, It includes computer instructions for causing a computer to execute the method for monitoring the state of a series current-limiting reactor based on bypass leakage current according to any one of claims 1-6.

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