CN113675819B - Inter-turn protection method and device of reactor and electronic equipment - Google Patents
Inter-turn protection method and device of reactor and electronic equipment Download PDFInfo
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- CN113675819B CN113675819B CN202010408513.1A CN202010408513A CN113675819B CN 113675819 B CN113675819 B CN 113675819B CN 202010408513 A CN202010408513 A CN 202010408513A CN 113675819 B CN113675819 B CN 113675819B
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- 238000001914 filtration Methods 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 14
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
- 238000012544 monitoring process Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
Abstract
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 obtaining the voltage between the ends of two or two groups of reactors connected in series in the power system; calculating unbalanced voltage according to the voltage between the terminals, and calculating action current according to the unbalanced voltage; measuring actual currents of branches where two or two groups of reactors connected in series are located; calculating a braking current according to the actual current; and performing differential protection according to the action current and the braking current. According to unbalanced voltage generated between two ends of two series reactors or two groups of reactors and current of the reactors, braking current and action current are obtained after a series of signal processing, and a differential protection method is further adopted to judge turn-to-turn faults. The method can realize rapid and accurate judgment of turn-to-turn faults of the reactor, and has higher reliability and sensitivity particularly for series-parallel reactors and phase-control reactors in ungrounded systems.
Description
Technical Field
The application relates to the field of protection of electric power system reactors, in particular to an inter-turn protection method of a reactor.
Background
Reactors are very common and very important devices in power systems, and are widely applied to reactive power compensation, fault current limiting, filter tuning, grounding and other occasions. To accommodate the needs of different applications, reactors have evolved into different types including hollow, iron-cored, dry, oil-immersed, naturally cooled, forced air cooled, etc. The basic structure of the reactor is similar, but is formed by winding one or more wires around a certain arc. Different inductance values can be obtained by adjusting parameters such as thickness of the wire, radius of the arc, number of turns of the winding, iron core and the like.
In operation, a reactor may fail for a variety of reasons, with an inter-turn short circuit failure being one of the most likely to occur and also the most difficult to detect. When the reactor has turn-to-turn faults, the inductance value of the reactor has small change, and correspondingly, the characteristic change of electric quantity such as current, voltage, magnetic field and the like of the support is also very small. In addition, the voltage in the power system also changes at any time, so that great difficulty is brought to the judgment of turn-to-turn faults.
The current method for judging the turn-to-turn faults mainly comprises a zero sequence component method, a magnetic field on-line monitoring method and the like. Wherein 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 the three phases of the reactor have no zero-sequence component when the turn-to-turn fault occurs. The magnetic field on-line monitoring method has a certain effect on the fixed switching reactor, but the monitoring equipment is expensive in cost and is not suitable for the controllable reactor with larger current change.
Disclosure of Invention
The application aims to provide a turn-to-turn protection method of a reactor, which is characterized in that a turn-to-turn fault is judged by adopting a differential protection method after a series of signal processing is carried out according to unbalanced voltage generated between two ends of two series reactors or current of the reactor. The method can realize rapid and accurate judgment of turn-to-turn faults of the reactor, and has higher reliability and sensitivity particularly for series-parallel reactors and phase-control reactors in ungrounded systems.
According to an aspect of the present application, there is provided an inter-turn protection method of a reactor, including:
respectively obtaining the voltage between the ends of two or two groups of reactors connected in series in the power system;
calculating unbalanced voltage according to the voltage between the terminals, and calculating action current according to the unbalanced voltage;
measuring actual currents of branches where two or two groups of reactors connected in series are located;
calculating a braking current according to the actual current;
and performing differential protection according to the action current and the braking current.
According to some embodiments of the present application, obtaining voltages between ends of two or two series reactors 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 two ends; or (b)
The voltage between the ends of the two or two groups of reactors is directly measured.
According to some embodiments of the 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 the reactor ends.
According to some embodiments of the application, calculating an unbalanced voltage from the inter-terminal voltage comprises:
the difference between the voltages between the ends of the two or two groups of reactors is taken as an unbalanced voltage.
According to some embodiments of the application, calculating the operating current from the unbalanced voltage comprises:
integrating the unbalanced voltage with time to obtain an integrated current;
and carrying out Fourier decomposition on the integrated current and taking the extracted fundamental wave effective value as an 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 fundamental wave component effective value obtained after Fourier decomposition as a braking current.
According to some embodiments of the application, the differential protection comprises:
differential quick-break protection or proportional differential protection.
Further, the criteria for differential quick-break protection include:
wherein I is d For the action current, I r For braking current, I cdqd Setting value for differential quick-break current.
Further, the criteria of the proportional differential protection include:
wherein I is d For the action current, I r For braking current, k d Setting value of proportionality coefficient for proportionality differential (k d <1)，I cdqd Setting the value for the differential starting current.
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 the reactor ends.
According to some embodiments of the application, differential protection from the action current and the braking current comprises:
and when the action current and the braking current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and have no locking condition, executing the differential protection action.
Further, the lockout condition includes:
one or more of the voltage transformer abnormality or exit, the current transformer abnormality, a branch switch or a knife in the power system being in a breaking position.
According to some embodiments of the 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 an inter-turn protection device of a series reactor, including:
the voltage acquisition module is used for respectively acquiring the voltages between the two ends of the two series-connected reactors or the two series-connected reactors 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 the branch circuit where the two series-connected or two groups of reactors 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 carrying out differential protection according to the action current and the braking current.
According to another aspect of the present application, there is provided an electronic device for reactor inter-turn protection, including:
one or more processors;
a storage means for storing one or more programs;
the 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 having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the inter-turn protection method described above.
The inter-turn protection method of the reactor provided by the application aims at solving the problems that the existing inter-turn fault judging method is not suitable for an ungrounded system or equipment and the cost is high, and the inter-turn fault is judged according to a differential protection method after a series of signal processing according to unbalanced voltage between the voltages between the ends of two or two groups of series reactors and the current of the reactor. The method has the characteristics of independence of three phases, decoupling judgment, no influence of unbalanced three-phase voltage and the like. The method has wide applicability to series-parallel reactors and phase control reactors in ungrounded systems. In addition, the inter-turn protection method has the advantages of high reliability, high sensitivity and wide application range, and can be used for rapidly and accurately detecting inter-turn faults of the reactor in engineering practical application, so that the expansion of accidents is avoided, the running stability of a power system is improved, and the equipment maintenance cost is reduced.
Additional aspects and advantages of the 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 application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application.
Fig. 1 shows a schematic diagram of the wiring of a reactor in a power line according to an example embodiment of the application.
Fig. 2 shows a schematic diagram of a connection of a reactor in a power line according to another exemplary embodiment of the application.
Fig. 3 shows a flow chart of a reactor inter-turn protection method according to an example embodiment of the application.
Fig. 4 is a schematic diagram of wiring for directly measuring a voltage between reactor terminals using a voltage transformer according to an example embodiment of the application.
Fig. 5 shows a reactor inter-turn protection method data processing flow diagram according to an example embodiment of the application.
Fig. 6 shows a reactor inter-turn protection action region diagram according to an example embodiment of the application.
Fig. 7 shows a block diagram of a reactor inter-turn protection device according to an example embodiment of the application.
Fig. 8 shows an electronic device composition block diagram for reactor inter-turn protection according to an example embodiment of the application.
Detailed Description
Example embodiments are described more fully below with reference to the accompanying drawings. However, the exemplary embodiments may 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, 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 application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not 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 element. Accordingly, a first component discussed below could be termed a second component without departing from the teachings of the present inventive concept. As used herein, the term "and/or" includes any one of the associated listed items and all combinations of one or more.
Those skilled in the art will appreciate that the drawings are schematic representations of example embodiments and may not be to scale. The modules or flow paths in the drawings are not necessarily required to practice the application and therefore should not be taken to limit the scope of the application.
Aiming at the problems that the prior inter-turn fault judging method is not suitable for an ungrounded system, the cost of monitoring equipment is high and the like, the inventor provides an inter-turn protection method of a reactor, and judges the inter-turn fault according to a differential protection method after a series of signal processing according to unbalanced voltage between voltages between two or two groups of series reactors and current of a branch where the reactor is located. The turn-to-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 scheme of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of the wiring of a reactor in a power line according to an example embodiment of the application.
As shown in fig. 1, two reactors L1 and L2 are connected in series in a loop. In the loop, the current flowing through the reactors L1 and L2 is denoted as I L . The head-end ground voltage of reactor L1 is denoted as U A The voltage to ground at the tail end is expressed as U nA . The head-end ground voltage of reactor L2 is denoted as U B The voltage to ground at the tail end is expressed as U nB 。
Fig. 2 shows a schematic diagram of a connection of a reactor in a power line according to another exemplary embodiment of the application.
As shown in fig. 2, two reactors L1 and L2 are directly connected 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 ground voltage of the reactor L1 is equal to the head end ground voltage of the reactor L2, and is the ground voltage of the connection point of the two reactors, denoted by U n 。
Fig. 3 shows a flow chart of a stator ground protection method according to an example embodiment of the application.
As shown in fig. 3, the inter-turn protection method of the reactor provided by the application comprises the following steps:
in step S110, the voltages between the ends of two reactors connected in series or two groups of reactors in the power system are obtained, respectively.
For the wiring scheme shown in fig. 1, the head-end voltage and the tail-end voltage of the two or more reactors may be measured, respectively, to calculate the voltage between the ends. According to some embodiments of the application, the head-end voltage and tail-end voltage may be measured using voltage transformers mounted end-to-ground or between reactor ends.
The head-end voltage and the tail-end voltage include: the first head-end voltage to ground, the first tail-end voltage to ground, the second head-end voltage to ground, and the second tail-end voltage to ground. 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 grounding voltage is the tail end grounding voltage U of the reactor L1 nA . The second head-end voltage to ground is the head-end voltage to ground U of the reactor L2 B . The second tail end grounding voltage is the tail end grounding voltage U of the reactor L2 nB . The specific process of the voltage between the terminals is as follows:
with a first head-end voltage to ground (head-end voltage to ground U of reactor L1 A ) With the first tail-end voltage to ground (tail-end voltage to ground U of reactor L1 nA ) As the first inter-terminal voltage, i.e., the inter-terminal voltage U of reactor L1 dA 。
With a second head-end voltage to ground (the head-end voltage to ground U of the reactor L2 B ) With the second tail-end ground voltage (tail-end ground voltage U of reactor L2) nB ) As the second terminal voltage, i.e. the terminal voltage U of reactor L2 dB 。
Furthermore, according to some embodiments of the present application, for the wiring scheme shown in FIG. 1, the voltage across the two or more sets of reactors, i.e., the first inter-terminal voltage U, may also be measured directly dA And a voltage U between the second terminals dB 。
For the wiring scheme shown in fig. 2, the head-end voltage and the tail-end voltage of the two or more sets of reactors are measured, respectively. 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 grounding voltage is the grounding voltage U of the connection point of the two reactors n . The second head end grounding voltage is the grounding voltage U of the connection point of the two reactors n . The second tail end grounding voltage is the tail end grounding voltage U of the reactor L2 B . First inter-terminal voltage U dA To ground for the first head endPressure U A With the first tail end to ground voltage U n Is a difference in (c). Voltage U between second ends dB Is the second head-end voltage to ground U n With the second tail end to ground voltage U B Is a difference in (c).
In step S120, an unbalanced voltage is calculated from the inter-terminal voltage, and an operating current is calculated from the unbalanced voltage.
Acquiring a first inter-terminal voltage U of an inductor L1 dA And the voltage U between the second end of the inductor L2 dB After that, first, the first inter-terminal voltage U dA With voltage U between second terminals dB As the unbalanced voltage U d . Unbalanced voltage U d Is an unbalanced voltage of the voltage between the two reactor terminals.
Next, for the unbalanced voltage U d 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 integral current, u is the unbalanced voltage, and L is the inductance value of the reactor.
Then, the fundamental wave effective value of the integrated current is extracted as an action current by adopting Fourier decomposition. The final output current is the action current I for differential protection by the extracted fundamental component effective value through Fourier decomposition d 。
In step S130, the actual currents of the branches in which the two or more series-connected reactors are located are 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 L After that, firstly, for the actual current I L Filtering and Fourier decomposition are carried out, and then the fundamental wave effective value obtained by the Fourier decomposition is taken as a braking current. After Fourier decomposition, the extracted fundamental wave effective value is the braking current I r 。
In step S150, differential protection is performed based on the operating current and the braking current. Processing to obtain action current I d And a braking current I r And then, adopting differential protection to carry out final action criterion. The differential protection includes differential quick-break protection or proportional differential protection.
For differential quick-break protection, the equation of motion is:
wherein I is d For the action current, I r For braking current, I cdsd Setting value for differential quick-break current.
For proportional differential protection, the equation of motion is:
wherein I is d For the action current, I r For braking current, k d Setting value of proportionality coefficient for proportionality differential (k d <1)，I cdqd Setting the value for the differential starting current.
Satisfying one of the proportional differential or differential quick-break indicates that the differential protection condition is satisfied. At this time, it is also necessary to determine whether other blocking conditions exist in the power line. Such as voltage transformer anomalies or withdrawals, current transformer anomalies, branch switches or knife-bars in the power system in one or more of the open positions.
And when the action current and the braking current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and have no locking condition, executing the differential protection action. And finally, sending out a signal of turn-to-turn protection action.
In addition, the inter-turn protection method of the reactor is also applicable to 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 inter-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 wiring for directly measuring a voltage between reactor terminals using a voltage transformer according to an example embodiment of the application.
For the wiring mode shown in fig. 1, the voltage transformer is connected according to the wiring mode shown in fig. 4, so that the voltage between the ends of the reactors L1 and L2 can be directly measured. The ground voltage of the head end and the tail end does not need to be measured respectively, and then the ground voltage is obtained through calculation.
Fig. 5 shows a reactor inter-turn protection method data processing flow diagram according to an example embodiment of the application.
In the flow of the turn-to-turn protection method shown in fig. 3, the braking current and the action current are calculated from the measurement of the current of the reactor, the voltage to the ground at the head end and the voltage to the ground at the tail end, and the data processing process is shown in fig. 5.
Firstly, according to the voltage U to the ground of the head end of the reactor L1 A And tail end ground voltage U nA Calculating the voltage U between the L1 ends of the reactors by the difference value dA . According to the head-end voltage to ground U of the reactor L2 B And tail end ground voltage U nB Difference value calculation is performed to calculate the voltage U between the ends of the reactor L2 dB . Then, the voltage U between the L1 ends of the reactor is further increased dA And a voltage U between ends of the reactor L2 dB Calculating the unbalanced voltage U of the voltage between the two reactor ends by the difference value d . Integrating the unbalanced voltage to obtain a current value, extracting the effective value of the fundamental component by Fourier decomposition, and finally outputting an action current I for differential protection d 。
Actually measured current I on reactor L Extracting effective value of fundamental component by filtering and Fourier decomposition to obtain braking current I for differential protection r 。
Fig. 6 shows a reactor inter-turn protection action region diagram according to an example embodiment of the application.
The inter-turn of the reactor provided by the applicationIn the protection method, as shown in fig. 6, the operation current I is used d (ordinate) and brake current I r (abscissa) the protection region of the inter-turn protection method can be divided into three regions: an inactive zone, an active zone, and a braking zone. When the reactor is in the braking zone, the inter-turn fault does not reach the 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 the data is abnormal or that the protection is locked out. Due to the action current I d Not exceeding the braking current I r And therefore does not enter the inactive area.
Fig. 7 shows a block diagram of a reactor inter-turn protection device according to an example embodiment of the application.
According to an exemplary embodiment of the present application, the present application also provides an inter-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 braking current calculation module 440 and a differential protection module 450. Wherein:
the voltage acquisition module 410 is configured to acquire voltages between two or two series reactors in the power system. According to some embodiments of the application, the head-end voltage and the tail-end voltage of the two or more sets of reactors may be measured using voltage transformers, respectively. And respectively carrying out difference value calculation on the head end voltage and the tail end voltage of the two or two groups of reactors to obtain the respective end voltage. According to other embodiments of the application, the voltage between the two or more sets of reactors may also be measured directly using a voltage transformer.
The operation current calculation module 420 is configured to calculate an unbalanced voltage according to the voltage between the terminals, and calculate an operation current according to the unbalanced voltage. And (3) carrying out difference on the voltages between the two or two groups of reactors to calculate the unbalanced voltage between the two or two groups of reactors. The unbalanced voltage is integrated to obtain a current value, and then the effective value of the fundamental component in the current value is extracted through Fourier decomposition, so that the action current for differential protection can be obtained.
The current acquisition module 430 is configured to measure actual currents of branches where two or two series reactors are located. According to other embodiments of the application, the current in the reactor may also be measured directly using a current transformer.
A brake current calculation module 440 for calculating a brake current based on the actual current. The actual measured current on the reactor is filtered and Fourier decomposed to extract the effective value of the fundamental wave component, and the braking current for differential protection can be obtained.
The differential protection module 450 is configured to perform differential protection according to the operating current and the braking current. After the action current and the braking current are obtained, the inter-turn fault judgment can be carried out by adopting differential quick-break protection or proportional differential protection. And when the action current and the braking current meet the criterion of differential quick-break protection or the criterion of proportional differential protection and have no locking condition, executing differential protection action.
Fig. 8 shows an electronic device composition block diagram for reactor inter-turn protection according to an example embodiment of the application.
The application also provides an electronic device 700 for inter-turn protection of the reactor. The control device 700 shown in fig. 8 is only an example, and should not impose any limitation on the functions and 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 connecting the different system components, including the memory unit 720 and the processing unit 710, etc.
The storage unit 720 stores program codes that can be executed by the processing unit 710, so that the processing unit 710 performs the methods according to the above-described embodiments of the present application described in the present specification.
The memory unit 720 may include readable media in the form of volatile memory units, such as Random Access Memory (RAM) 7201 and/or cache memory 7202, and may further include Read Only Memory (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 or some combination of which may include an implementation of a network environment.
Bus 730 may be a bus representing 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.), one or more devices that enable a user to interact with the electronic device 700, and/or any device (e.g., router, modem, etc.) that enables the electronic device 700 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 750. Also, electronic device 700 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through network adapter 760. Network adapter 760 may communicate with other modules of electronic device 700 via bus 730. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 700, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
Furthermore, the present application provides a computer-readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the inter-turn protection method of 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. And the three phases are independent and decoupled, so that the influence of unbalanced three-phase voltage is avoided. The method has wide applicability 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 engineering practical application, turn-to-turn faults of the reactor can be detected rapidly 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 is apparent that the above examples are only illustrative of the present application and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present application.
Claims (12)
1. An inter-turn protection method of a reactor, comprising:
respectively obtaining the voltage between the ends of two or two groups of reactors connected in series in the power system;
calculating an unbalanced voltage according to the voltage between the terminals, and calculating an action current according to the unbalanced voltage, wherein:
taking the difference value between the voltages between the two ends of the two or two groups of reactors as unbalanced voltage;
integrating the unbalanced voltage with time to obtain an integrated current;
performing Fourier decomposition on the integrated current and taking the extracted fundamental wave effective value as an action current;
measuring actual currents of branches where two or two groups of reactors connected in series are located;
calculating a braking current according to the actual current, wherein:
filtering and fourier decomposing the actual current;
taking the fundamental wave component effective value obtained after Fourier decomposition as a braking current;
and performing differential protection according to the action current and the braking current.
2. The method of claim 1, wherein the step of obtaining the voltages between the ends of two 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 two ends; or (b)
The voltage between the ends of the two or two groups of reactors is directly measured.
3. The inter-turn protection method of 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 the reactor ends.
4. The inter-turn protection method of claim 3, wherein the differential protection comprises:
differential quick-break protection or proportional differential protection.
5. The inter-turn protection method according to claim 4, wherein the criteria for differential quick-break protection comprises:
wherein I is d For the action current, I r For braking current, I cdsd Setting value for differential quick-break current.
6. The inter-turn protection method according to claim 4, wherein the criteria for proportional differential protection include:
wherein I is d For the action current, I r For braking current, k d Setting value of proportionality coefficient for proportionality differential (k d <1)，I cdqd Setting the value for the differential starting current.
7. The inter-turn protection method according to claim 4, wherein differential protection based on the operating current and the braking current includes:
and when the action current and the braking current meet the criterion of the differential quick-break protection or the criterion of the proportional differential protection and have no locking condition, executing the differential protection action.
8. The inter-turn protection method of claim 7, wherein the lockout condition comprises:
one or more of the voltage transformer abnormality or exit, the current transformer abnormality, a branch switch or a knife in the power system being in a breaking position.
9. The inter-turn protection method of claim 1, wherein at least one of the two sets of reactors comprises:
more than two reactors connected in series.
10. An inter-turn protection device for a series reactor, comprising:
the voltage acquisition module is used for respectively acquiring the voltages between the two ends of the two series-connected reactors or the two series-connected reactors 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, wherein:
taking the difference value between the voltages between the two ends of the two or two groups of reactors as unbalanced voltage;
integrating the unbalanced voltage with time to obtain an integrated current;
performing Fourier decomposition on the integrated current and taking the extracted fundamental wave effective value as an action current;
the current acquisition module is used for measuring the actual current of the branch circuit where the two series-connected or two groups of reactors are located;
the braking current calculation module is used for calculating braking current according to the actual current, wherein:
filtering and fourier decomposing the actual current;
taking the fundamental wave component effective value obtained after Fourier decomposition as a braking current;
and the differential protection module is used for carrying out differential protection according to the action current and the braking current.
11. An electronic device for series reactor turn-to-turn protection, comprising:
one or more processors;
a storage means for storing one or more programs;
when executed by the one or more processors, causes the one or more processors to implement the inter-turn protection method as recited in any of claims 1-9.
12. A computer readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements an inter-turn protection method as claimed in any one of claims 1-9.
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