阅读说明：本技术 电抗器的匝间保护方法、装置及电子设备 (Reactor turn-to-turn protection method and device and electronic equipment ) 是由 陈辉 黄鑫 李成博 张磊 周启文 于 2020-05-14 设计创作，主要内容包括：本申请提出一种电抗器的匝间保护方法、装置、电子设备及计算机可读介质。该方法包括：分别获取电力系统中串联的两个或两组电抗器的端间电压；根据所述端间电压计算不平衡电压,并根据所述不平衡电压计算出动作电流；测量串联的两个或两组电抗器所在支路的实际电流；根据所述实际电流计算出制动电流；根据所述动作电流和所述制动电流进行差动保护。根据串联的两个或两组电抗器的端间产生的不平衡电压,以及电抗器的电流,经过一系列的信号处理之后获得制动电流和动作电流,进一步采用差动保护的方法来判断匝间故障。能够实现电抗器匝间故障的快速、准确判断,尤其对于不接地系统中的串并联电抗器以及相控电抗器具有较高的可靠性和灵敏性。(The application provides a turn-to-turn protection method and device of a reactor, electronic equipment and a computer readable medium. The method comprises the following steps: respectively acquiring end-to-end voltages of two or two groups of reactors connected in series in a power system; calculating unbalanced voltage according to the voltage between the ends, and calculating action current according to the unbalanced voltage; measuring actual current of a branch where two or two groups of reactors connected in series are located; calculating braking current according to the actual current; and carrying out differential protection according to the action current and the brake current. According to unbalanced voltage generated between the ends of two or two groups of reactors connected in series and the current of the reactors, braking current and action current are obtained after a series of signal processing, and turn-to-turn faults are further judged by adopting a differential protection method. The method can realize the rapid and accurate judgment of the turn-to-turn fault of the reactor, and has higher reliability and sensitivity particularly to a series-parallel reactor and a phase control reactor in an ungrounded system.)

1. A method for inter-turn protection of a reactor, comprising:

respectively acquiring end-to-end voltages of two or two groups of reactors connected in series in a power system;

calculating unbalanced voltage according to the voltage between the ends, and calculating action current according to the unbalanced voltage;

measuring actual current of a branch where two or two groups of reactors connected in series are located;

calculating braking current according to the actual current;

and carrying out differential protection according to the action current and the brake current.

2. The inter-turn protection method according to claim 1, wherein the obtaining of the inter-terminal voltages of two or two sets of reactors connected in series in the power system respectively comprises:

respectively measuring the head end voltage and the tail end voltage of the two or two groups of reactors, and calculating the voltage between the ends; or

And directly measuring the voltage between the two or two groups of reactors.

3. The inter-turn protection method according to claim 2, further comprising:

measuring the actual current using a current transformer;

the head end voltage and the tail end voltage are measured using a voltage transformer mounted end to ground or between reactor ends.

4. The inter-turn protection method according to claim 1, wherein calculating an unbalanced voltage from the terminal-to-terminal voltage comprises:

and taking the difference value between the voltages between the two or two groups of reactors as unbalanced voltage.

5. The inter-turn protection method according to claim 1, wherein calculating an action current from the unbalanced voltage comprises:

integrating the unbalanced voltage with time to obtain an integrated current;

fourier decomposition is performed on the integrated current, and the extracted fundamental wave effective value is used as the action current.

6. The inter-turn protection method according to claim 1, wherein calculating a braking current from the actual current comprises:

filtering and Fourier decomposing the actual current;

and taking the effective value of the fundamental component obtained after Fourier decomposition as the braking current.

7. The inter-turn protection method according to claim 1, wherein the differential protection comprises:

differential quick-break protection or proportional differential protection.

8. The turn-to-turn protection method according to claim 7, wherein the criterion of differential quick-break protection comprises:

wherein, I_dFor an operating current, I_rFor braking current, I_cdsdIs a differential quick-break current setting value.

9. The inter-turn protection method according to claim 7, wherein the criterion of the proportional differential protection comprises:

wherein, I_dFor an operating current, I_rFor braking current, k_dScaling factor setting (k) for proportional differential_d<1)，I_cdqdAnd setting a differential starting current value.

10. The inter-turn protection method according to claim 7, wherein performing differential protection based on the action current and the braking current comprises:

and when the action current and the brake current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and no locking condition exists, executing a differential protection action.

11. The inter-turn protection method according to claim 10, wherein said latch-up condition comprises:

the voltage transformer is abnormal or withdrawn, the current transformer is abnormal, and a branch switch or a knife switch in the power system is in a switch-off position.

12. The inter-turn protection method according to claim 1, wherein at least one of the two sets of reactors comprises:

more than two reactors connected in series.

13. An inter-turn protection device for a series reactor, comprising:

the voltage acquisition module is used for respectively acquiring the voltage between the ends of two or two groups of reactors connected in series in the power system;

the action current calculation module is used for calculating unbalanced voltage according to the voltage between the terminals and calculating action current according to the unbalanced voltage;

the current acquisition module is used for measuring the actual current of a branch where two or two groups of reactors connected in series are located;

the braking current calculation module is used for calculating braking current according to the actual current;

and the differential protection module is used for performing differential protection according to the action current and the brake current.

14. An electronic device for series reactor turn-to-turn protection, comprising:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the inter-turn protection method of any one of claims 1-12.

15. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the inter-turn protection method according to any one of claims 1 to 12.

Technical Field

The application relates to the field of protection of electric reactors of power systems, in particular to a turn-to-turn protection method of an electric reactor.

Background

The reactor is a very common and very important device in an electric power system, and is widely applied to occasions such as reactive power compensation, fault current limiting, filter tuning and grounding. In order to meet the requirements of different occasions, reactors are developed into different types, including hollow, iron-core, dry, oil-immersed, natural cooling, forced air cooling and the like. The basic structure of reactors is similar and is made by winding one or more wires around a circular arc. Different inductance values can be obtained by adjusting the thickness of the lead, the radius of the arc, the number of turns of the winding, the iron core and other parameters.

During operation of a reactor, a fault occurs for various reasons, wherein a turn-to-turn short circuit fault is one of the most likely and difficult faults to detect of the reactor. When the reactor has turn-to-turn fault, the inductance value of the reactor changes very little, and correspondingly, the characteristic changes of electric quantities such as the current, the voltage, the magnetic field and the like of the branch circuit are also very little. In addition, the voltage in the power system also changes at any time, which makes it difficult to determine the turn-to-turn fault.

The current method for judging turn-to-turn faults mainly comprises a zero-order component method, a magnetic field online monitoring method and the like. The zero sequence component method can only be applied to a high-voltage grounding system. For an ungrounded system, the zero sequence component method cannot be applied because three phases of the reactor have no zero sequence component during turn-to-turn fault. The magnetic field on-line monitoring method has a certain effect on the fixed switching type reactor, but the monitoring equipment is expensive in manufacturing cost and is not suitable for the controllable reactor with large current change.

Disclosure of Invention

The application aims to provide a turn-to-turn protection method of a reactor, which judges turn-to-turn faults by adopting a differential protection method after a series of signal processing is carried out according to unbalanced voltage generated between the ends of two or two groups of reactors connected in series and the current of the reactors. The method can realize the rapid and accurate judgment of the turn-to-turn fault of the reactor, and has higher reliability and sensitivity particularly to a series-parallel reactor and a phase control reactor in an ungrounded system.

According to an aspect of the present application, there is provided a turn-to-turn protection method of a reactor, including:

respectively acquiring end-to-end voltages of two or two groups of reactors connected in series in a power system;

calculating unbalanced voltage according to the voltage between the ends, and calculating action current according to the unbalanced voltage;

measuring actual current of a branch where two or two groups of reactors connected in series are located;

calculating braking current according to the actual current;

and carrying out differential protection according to the action current and the brake current.

According to some embodiments of the present application, acquiring inter-terminal voltages of two or two sets of reactors connected in series in a power system, respectively, includes:

respectively measuring the head end voltage and the tail end voltage of the two or two groups of reactors, and calculating the voltage between the ends; or

And directly measuring the voltage between the two or two groups of reactors.

According to some embodiments of the present application, the actual current is measured using a current transformer; the head end voltage and the tail end voltage are measured using a voltage transformer mounted end to ground or between reactor ends.

According to some embodiments of the application, calculating an unbalanced voltage from the inter-terminal voltage comprises:

and taking the difference value between the voltages between the two or two groups of reactors as unbalanced voltage.

According to some embodiments of the application, calculating an action current from the unbalanced voltage comprises:

integrating the unbalanced voltage with time to obtain an integrated current;

fourier decomposition is performed on the integrated current, and the extracted fundamental wave effective value is used as the action current.

According to some embodiments of the application, calculating a braking current from the actual current comprises:

filtering and Fourier decomposing the actual current;

and taking the effective value of the fundamental component obtained after Fourier decomposition as the braking current.

According to some embodiments of the application, the differential protection comprises:

differential quick-break protection or proportional differential protection.

Further, the criterion of the differential quick-break protection comprises:

wherein, I_dFor an operating current, I_rFor braking current, I_cdqdIs a differential quick-break current setting value.

Further, the criterion of the proportional differential protection comprises:

wherein, I_dFor an operating current, I_rFor braking current, k_dScaling factor setting (k) for proportional differential_d<1)，I_cdqdAnd setting a differential starting current value.

According to some embodiments of the application, the inter-turn protection method further comprises:

measuring the actual current using a current transformer;

the head end voltage and the tail end voltage are measured using a voltage transformer mounted end to ground or between reactor ends.

According to some embodiments of the application, differential protection according to the action current and the braking current comprises:

and when the action current and the brake current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and no locking condition exists, executing a differential protection action.

Further, the lockout condition includes:

the voltage transformer is abnormal or withdrawn, the current transformer is abnormal, and a branch switch or a knife switch in the power system is in a switch-off position.

According to some embodiments of the present application, at least one of the two sets of reactors comprises:

more than two reactors connected in series.

According to another aspect of the present application, there is provided a turn-to-turn protection device of a series reactor, including:

the voltage acquisition module is used for respectively acquiring the voltage between the ends of two or two groups of reactors connected in series in the power system;

the action current calculation module is used for calculating unbalanced voltage according to the voltage between the terminals and calculating action current according to the unbalanced voltage;

the current acquisition module is used for measuring the actual current of a branch where two or two groups of reactors connected in series are located;

the braking current calculation module is used for calculating braking current according to the actual current;

and the differential protection module is used for performing differential protection according to the action current and the brake current.

According to another aspect of the present application, there is provided an electronic device for reactor turn-to-turn protection, including:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the inter-turn protection method described above.

According to another aspect of the present application, there is provided a computer-readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the inter-turn protection method described above.

According to the inter-turn protection method of the reactor, aiming at the problems that the existing inter-turn fault judgment method is not suitable for an ungrounded system or the equipment is high in cost and the like, the inter-turn fault is judged according to a differential protection method after a series of signal processing is carried out on unbalanced voltage between end-to-end voltages of two or two groups of series reactors and current of the reactor. The method has the characteristics of three-phase independence, decoupling judgment, no influence of three-phase voltage unbalance and the like. The method has wide applicability particularly to series-parallel reactors and phase control reactors in ungrounded systems. In addition, the turn-to-turn protection method has the advantages of high reliability, high sensitivity and wide application range, can quickly and accurately detect the turn-to-turn fault of the reactor in the practical engineering application, avoids the expansion of accidents, improves the running stability of a power system, and reduces the maintenance cost of equipment.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.

Fig. 1 shows a wiring schematic diagram of a reactor in an electric power line according to an example embodiment of the present application.

Fig. 2 shows a schematic wiring diagram of a reactor in an electric power line according to another example embodiment of the present application.

FIG. 3 shows a flow chart of a reactor turn-to-turn protection method according to an example embodiment of the application.

FIG. 4 is a schematic diagram of a direct measurement of voltage across reactor terminals using a voltage transformer according to an example embodiment of the present application.

FIG. 5 shows a data processing flow chart of a reactor turn-to-turn protection method according to an example embodiment of the application.

Figure 6 shows a diagram of a reactor turn-to-turn protection action area according to an example embodiment of the present application.

Fig. 7 shows a block diagram of a reactor inter-turn protection device according to an example embodiment of the present application.

FIG. 8 shows a block diagram of an electronic device composition of reactor turn-to-turn protection according to an example embodiment of the present application.

Detailed Description

Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Those skilled in the art will appreciate that the drawings are merely schematic representations of exemplary embodiments, which may not be to scale. The blocks or flows in the drawings are not necessarily required to practice the present application and therefore should not be used to limit the scope of the present application.

Aiming at the problems that the existing turn-to-turn fault judgment method is not suitable for an ungrounded system, monitoring equipment is high in manufacturing cost and the like, the inventor provides a turn-to-turn protection method of a reactor, and the turn-to-turn fault is judged according to the unbalanced voltage between the end-to-end voltages of two or two groups of series reactors and the current of a branch circuit where the reactor is located after a series of signal processing and a differential protection method. The inter-turn protection method has the advantages of high reliability, high sensitivity, wide application range and the like, and is particularly suitable for series-parallel reactors and phase control reactors in low-voltage ungrounded systems.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a wiring schematic diagram of a reactor in an electric power line according to an example embodiment of the present application.

As shown in fig. 1, two reactors L1 and L2 are connected in series in the loop. In the loop, the current flowing through reactors L1 and L2 is denoted as I_L. The head end of reactor L1 is shown as U with respect to ground voltage_AAnd tail-end voltage to ground is represented as U_nA. The head end of reactor L2 is shown as U with respect to ground voltage_BAnd tail-end voltage to ground is represented as U_nB。

Fig. 2 shows a schematic wiring diagram of a reactor in an electric power line according to another example embodiment of the present application.

As shown in fig. 2, two reactors L1 and L2 are connected directly in series in the loop. Wherein the tail end of the reactor L1 is directly connected with the head end of the reactor L2. At this time, the tail end of reactor L1 and the head end of reactor L2 are groundedEqual, voltage to ground, denoted U, for both reactor junctions_n。

Fig. 3 shows a flow chart of a stator ground protection method according to an example embodiment of the present application.

As shown in fig. 3, the present application provides a method for inter-turn protection of a reactor, including:

in step S110, inter-terminal voltages of two or two sets of reactors connected in series in the power system are acquired, respectively.

For the connection mode shown in fig. 1, the head end voltage and the tail end voltage of the two or two groups of reactors can be measured respectively, and the inter-terminal voltage can be calculated. According to some embodiments of the application, the head end voltage and the tail end voltage may be measured using a voltage transformer mounted end to ground or between reactor ends.

The head end voltage and the tail end voltage include: the first head end is connected with the ground voltage, the first tail end is connected with the ground voltage, the second head end is connected with the ground voltage, and the second tail end is connected with the ground voltage. Wherein the first head end voltage to ground is the head end voltage to ground U of the reactor L1_A. The first tail end voltage to ground is the tail end voltage to ground U of the reactor L1_nA. The second head end to ground voltage is the head end to ground voltage U of reactor L2_B. The second tail end voltage to ground is the tail end voltage to ground U of the reactor L2_nB. The specific process of the inter-terminal voltage is as follows:

with a first head end to ground voltage (head end to ground voltage U of reactor L1)_A) To the first tail-end ground voltage (tail-end ground voltage U of reactor L1)_nA) Is taken as a first terminal-to-terminal voltage, i.e., the terminal-to-terminal voltage U of the reactor L1_dA。

With a second head end to ground voltage (head end to ground voltage U of reactor L2)_B) And the second tail end voltage to ground (tail end voltage to ground U of reactor L2)_nB) Is taken as a second inter-terminal voltage, i.e., inter-terminal voltage U of reactor L2_dB。

Furthermore, according to some embodiments of the present application, for the connection mode shown in fig. 1, it is also possible to directly measure the inter-terminal voltage of the two or two sets of reactors, i.e. the first inter-terminal voltageU_dAAnd a second terminal voltage U_dB。

For the wiring scheme shown in fig. 2, the head end voltage and the tail end voltage of the two or two sets of reactors are measured separately. Wherein the first head end voltage to ground is the head end voltage to ground U of the reactor L1_A. The first tail end is the voltage to earth U of two reactor connection points_n. The second head end is the voltage to earth U of the connection point of the two reactors_n. The second tail end voltage to ground is the tail end voltage to ground U of the reactor L2_B. First inter-terminal voltage U_dAFor a first head end to ground voltage U_AAnd a first tail end to ground voltage U_nThe difference of (a). Voltage U between the second terminals_dBFor the second head end to ground voltage U_nAnd the second tail end to ground voltage U_BThe difference of (a).

In step S120, an unbalanced voltage is calculated from the inter-terminal voltage, and an operating current is calculated from the unbalanced voltage.

Obtaining a first terminal-to-terminal voltage U of inductor L1_dAAnd a voltage U between the second terminals of the inductor L2_dBThen, first, the first inter-terminal voltage U is applied_dAAnd a voltage U between the second terminal_dBAs the unbalanced voltage U_d. Unbalanced voltage U_dIs the unbalanced voltage of the voltage between the two reactor terminals.

Next, the unbalanced voltage U is applied_dAnd integrating the time to obtain an integrated current. Specifically, the integration operation may be performed according to the following formula:

wherein I is the obtained integrated current, u is the unbalanced voltage, and L is an inductance value of the reactor.

Then, the effective value of the fundamental wave of the integrated current is extracted as an operating current by Fourier decomposition. The effective value of the fundamental component extracted by Fourier decomposition, and the final output current is the operating current I for differential protection_d。

In step S130, the actual current of the branch where two or two sets of reactors are connected in series is measured. According to some embodiments of the application, the actual current I may be measured using a current transformer_L。

In step S140, a braking current is calculated from the actual current. Obtaining the actual current I_LThen, the actual current I is firstly measured_LAnd carrying out filtering and Fourier decomposition, and then taking the effective value of the fundamental wave obtained by the Fourier decomposition as the braking current. After Fourier decomposition, the extracted effective value of the fundamental wave is the brake current I_r。

In step S150, differential protection is performed according to the operating current and the braking current. Processing to obtain an operating current I_dAnd a braking current I_rAnd finally, judging the action by adopting differential protection. The differential protection comprises differential quick-break protection or proportional differential protection.

For differential quick-break protection, the action equation is as follows:

wherein, I_dFor an operating current, I_rFor braking current, I_cdsdIs a differential quick-break current setting value.

For proportional differential protection, the action equation is as follows:

wherein, I_dFor an operating current, I_rFor braking current, k_dScaling factor setting (k) for proportional differential_d<1)，I_cdqdAnd setting a differential starting current value.

When one of the proportional differential and the differential quick break is satisfied, the differential protection condition is satisfied. At this time, it is also necessary to determine whether or not another lock-out condition exists in the power line. Such as one or more of a voltage transformer exception or exit, a current transformer exception, a branch switch or a disconnector in the power system being in a tripped position.

And when the action current and the brake current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and no locking condition exists, executing a differential protection action. Finally, the turn-to-turn protection action is signaled.

In addition, the reactor turn-to-turn protection method provided by the application is also suitable for the situation that more than two reactors are connected in series. When more than two reactors are connected in series in the loop, the reactors can be divided into two groups, and the two groups of reactors are equivalent to two reactors for turn-to-turn protection. At least one of the two groups of reactors comprises more than two reactors connected in series.

FIG. 4 is a schematic diagram of a direct measurement of voltage across reactor terminals using a voltage transformer according to an example embodiment of the present application.

For the wiring mode shown in fig. 1, a voltage transformer is connected in the wiring mode shown in fig. 4, and the voltage between the terminals of the reactors L1 and L2 can be directly measured. The voltages to earth at the head end and the tail end do not need to be measured respectively and then are obtained through calculation.

FIG. 5 shows a data processing flow chart of a reactor turn-to-turn protection method according to an example embodiment of the application.

In the turn-to-turn protection method flow shown in fig. 3, the braking current and the action current are calculated from the current of the reactor, the voltage to ground at the head end and the voltage to ground at the tail end, and the data processing process is shown in fig. 5.

Firstly, according to the voltage U to ground at the head end of the reactor L1_AAnd tail-end voltage to ground U_nACalculating the voltage U between the ends of the reactor L1 by the difference_dA. According to the voltage U to ground of the head end of the reactor L2_BAnd tail-end voltage to ground U_nBAnd calculating the voltage U between the ends of the reactor L2 by the difference_dB. Then, the voltage U between the terminals of the reactor L1 is further applied_dAAnd the voltage U between the terminals of the reactor L2_dBCalculating the unbalanced voltage U of the voltage between the two reactor terminals by difference_d. The unbalanced voltage is appliedIntegrating to obtain current value, Fourier decomposing to extract effective value of fundamental component, and outputting final action current I for differential protection_d。

Current I actually measured on the reactor_LExtracting the effective value of the fundamental component in the brake current I for differential protection by filtering and Fourier decomposition to obtain the brake current I for differential protection_r。

Figure 6 shows a diagram of a reactor turn-to-turn protection action area according to an example embodiment of the present application.

In the inter-turn protection method of the reactor provided by the invention, as shown in FIG. 6, according to the operating current I_d(ordinate) and brake current I_r(abscissa), the protection zone of the inter-turn protection method can be divided into three zones: null, action and braking zones. When the reactor is in a braking zone, the turn-to-turn fault does not reach a setting value, and the reactor can continue to operate stably. The action zone comprises a proportional differential action zone and a differential quick-break action zone, and the two action zones are partially overlapped. The invalid region indicates that data is abnormal or that protection is blocked. Due to the action current I_dWill not exceed the braking current I_rAnd thus does not enter the null area.

Fig. 7 shows a block diagram of a reactor inter-turn protection device according to an example embodiment of the present application.

According to an example embodiment of the present application, the present application also provides a turn-to-turn protection device 400 of a reactor, including: the device comprises a voltage acquisition module 410, an action current calculation module 420, a current acquisition module 430, a brake current calculation module 440 and a differential protection module 450. Wherein:

the voltage obtaining module 410 is configured to obtain voltages between two or two sets of reactors connected in series in the power system. According to some embodiments of the application, a voltage transformer may be used to measure the head end voltage and the tail end voltage of the two or two sets of reactors, respectively. And respectively calculating the voltage between the two ends by performing difference on the head end voltage and the tail end voltage of the two or two groups of reactors. According to other embodiments of the present application, the inter-terminal voltage of the two or two sets of reactors may also be directly measured using a voltage transformer.

And an action current calculation module 420, configured to calculate an unbalanced voltage according to the inter-terminal voltage, and calculate an action current according to the unbalanced voltage. And calculating the unbalanced voltage between the two or two groups of reactors by carrying out difference on the voltages between the two or two groups of reactors. The unbalanced voltage is integrated to obtain a current value, and then effective values of fundamental wave components in the current value are extracted through Fourier decomposition, so that the action current for differential protection can be obtained.

And the current obtaining module 430 is used for measuring the actual current of the branch where the two or two groups of reactors connected in series are located. According to other embodiments of the present application, the current in the reactor may also be measured directly using a current transformer.

And a braking current calculating module 440, configured to calculate a braking current according to the actual current. The current actually measured by the reactor is filtered and subjected to Fourier decomposition, and the effective value of the fundamental component in the current is extracted, so that the braking current for differential protection can be obtained.

And a differential protection module 450, configured to perform differential protection according to the action current and the braking current. After the action current and the braking current are obtained, the turn-to-turn fault can be judged by adopting differential quick-break protection or proportional differential protection. And when the action current and the brake current meet the criterion of differential quick-break protection or the criterion of proportional differential protection and no locking condition exists, executing differential protection action.

FIG. 8 shows a block diagram of an electronic device composition of reactor turn-to-turn protection according to an example embodiment of the present application.

The present application further provides an electronic device 700 for reactor turn-to-turn protection. The control device 700 shown in fig. 8 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

As shown in fig. 8, the control device 700 is in the form of a general purpose computing device. The components of the control device 700 may include, but are not limited to: at least one processing unit 710, at least one memory unit 720, a bus 730 that couples various system components including the memory unit 720 and the processing unit 710, and the like.

The storage unit 720 stores program codes, which can be executed by the processing unit 710 to cause the processing unit 710 to execute the methods according to the above-mentioned embodiments of the present application described in the present specification.

The storage unit 720 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)7201 and/or a cache memory unit 7202, and may further include a read only memory unit (ROM) 7203.

The storage unit 720 may also include a program/utility 7204 having a set (at least one) of program modules 7205, such program modules 7205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.

Bus 730 may be any representation of one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

The electronic device 700 may also communicate with one or more external devices 7001 (e.g., touch screen, keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 700, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 700 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 750. Also, the electronic device 700 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) via the network adapter 760. The network adapter 760 may communicate with other modules of the electronic device 700 via the bus 730. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.

Furthermore, the present application also provides a computer-readable medium, on which a computer program is stored, wherein the program is implemented, when being executed by a processor, to implement the inter-turn protection method for a reactor described above.

The inter-turn protection method of the reactor is suitable for occasions where two or more reactors are connected in series. The three phases are independent and the decoupling judgment is carried out, so that the influence of the unbalance of the three-phase voltage is avoided. The method has wide applicability particularly to series-parallel reactors and phase control reactors in ungrounded systems. In addition, the turn-to-turn protection method has the advantages of high reliability, high sensitivity, wide application range and the like. In practical engineering application, turn-to-turn faults of the reactor can be detected quickly and accurately, and accident expansion is avoided, so that the running stability of a power system is improved, and the equipment maintenance cost is reduced.

It should be understood that the above examples are only for clearly illustrating the present application and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention may be made without departing from the spirit or scope of the invention.