CN113036714A - Method and device for inhibiting breaking fault of electromagnetic voltage transformer - Google Patents

Method and device for inhibiting breaking fault of electromagnetic voltage transformer Download PDF

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Publication number
CN113036714A
CN113036714A CN202011420639.7A CN202011420639A CN113036714A CN 113036714 A CN113036714 A CN 113036714A CN 202011420639 A CN202011420639 A CN 202011420639A CN 113036714 A CN113036714 A CN 113036714A
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CN
China
Prior art keywords
voltage transformer
fuse
electromagnetic voltage
electromagnetic
suppressed
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CN202011420639.7A
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Chinese (zh)
Inventor
王智晖
桂媛
徐兴全
杨亚奇
姚玉海
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State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Beijing Electric Power Co Ltd
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Priority to CN202011420639.7A priority Critical patent/CN113036714A/en
Publication of CN113036714A publication Critical patent/CN113036714A/en
Pending legal-status Critical Current

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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
    • H02H7/04—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 for transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H02H9/007—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions avoiding or damping oscillations, e.g. fenoresonance or travelling waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/028—Current limitation by detuning a series resonant circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Transformers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a method and a device for inhibiting an open-circuit fault of an electromagnetic voltage transformer, a storage medium and an electronic device. Wherein, the method comprises the following steps: acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; according to the cause of the open fuse of the electromagnetic voltage transformer, a suppression measure for suppressing the occurrence of the failure of the open fuse is determined. By adopting the technical scheme, the problem that corresponding inhibition measures cannot be adopted according to the historical data of the fault that the electromagnetic voltage transformer in the transformer substation has high-voltage fuse fusing in the related technology is solved.

Description

Method and device for inhibiting breaking fault of electromagnetic voltage transformer
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for suppressing a fail-safe fault of an electromagnetic voltage transformer, a storage medium, and an electronic apparatus.
Background
An electromagnetic voltage Transformer (PT) is an important device for measuring, metering and relaying voltage in a power grid. In order to protect PT and to avoid adverse effects of PT body failure or high-voltage side lead failure on the main system, a high-voltage fuse (also called high-voltage fuse) is generally installed at the high-voltage inlet of PT for isolation. The high-voltage fuse is used as a PT protection measure, has a simple structure, is convenient to overhaul and maintain, and is widely applied to a power grid below 110 kV.
In the actual operation process, the PT in the transformer substation often has the fault of high-voltage fuse fusing, so that the PT secondary side loses voltage and the zero sequence voltage is abnormally increased. Therefore, electric energy metering errors are caused, or false grounding alarm of a system is caused, malfunction of the zero sequence voltage protection relay is caused, and operating personnel adopt wrong handling measures to enlarge the accident range. On the other hand, the replacement of the PT high-voltage fuse is troublesome, and the expenditure of manpower and material resources is increased. The above situations are not favorable for the safe, reliable, stable and economic operation of the power grid, and need to be improved urgently.
Aiming at the problem that corresponding inhibition measures cannot be adopted according to the historical data of the fault that the electromagnetic voltage transformer in the transformer substation has high-voltage fuse fusing in the related technology, an effective solution is not provided.
Disclosure of Invention
The embodiment of the invention provides a method and a device for inhibiting a fuse-breaking fault of an electromagnetic voltage transformer, a storage medium and an electronic device, and aims to solve the problem that a corresponding inhibition measure cannot be adopted according to historical data of the fault that the electromagnetic voltage transformer in a transformer substation has high-voltage fuse-breaking.
According to an embodiment of the present invention, there is provided a method for suppressing an open-circuit fault of an electromagnetic voltage transformer, including: acquiring historical data of the broken fuse of an electromagnetic voltage transformer of a transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
Optionally, determining a suppression measure for suppressing the fault of the fuse breaker according to the cause of the fuse breaker of the electromagnetic voltage transformer includes: in the case that the cause of the open fuse is ferroresonance, the open fuse is suppressed by a secondary resonance elimination device or by a primary resonance elimination device; when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor; when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
Optionally, suppressing the cut-off fuse by a second harmonic elimination device, comprising: and connecting a first resistor in parallel with a high-voltage winding of the electromagnetic voltage transformer to inhibit the fuse from being disconnected, wherein the secondary resonance elimination device comprises: the first resistance.
Optionally, the grounding of the neutral point of the electromagnetic voltage transformer through a resistor to suppress the fuse breaking includes: and connecting a second resistor in series with a neutral point of the electromagnetic voltage transformer, and grounding the second resistor to inhibit the fuse from being disconnected, wherein the resistance value of the second resistor is smaller than a preset threshold value.
Optionally, the neutral point is grounded through an arc suppression coil to suppress the fuse break, including: an arc suppression coil is connected in series with a neutral point of the electromagnetic voltage transformer, and the arc suppression coil is grounded to suppress the fuse breaking.
Optionally, suppressing the cut-off fuse by a primary resonance elimination device, comprising: a nonlinear resistance harmonic elimination damping device is connected in series with the electromagnetic voltage transformer to restrain the cut-off fuse, wherein the primary harmonic elimination device comprises: the nonlinear resistance resonance elimination damping device is provided.
Optionally, when the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer, connecting an electromagnetic voltage transformer in series with the three-phase electromagnetic voltage transformer to ground to inhibit the fuse from being broken includes: and the three-phase electromagnetic voltage transformer is connected with a zero-sequence electromagnetic voltage transformer of a communication signal in series to form a four-phase electromagnetic voltage transformer to inhibit the fuse from being broken.
According to another embodiment of the present invention, there is also provided an apparatus for suppressing a tripping failure of an electromagnetic voltage transformer, including: the acquisition module is used for acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; the determination module is used for determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
Optionally, the determining module is further configured to suppress the open fuse by a second harmonic elimination device or by a first harmonic elimination device in a case that the cause of the open fuse is ferroresonance; when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor; when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
According to a further embodiment of the present invention, a computer-readable storage medium is also provided, in which a computer program is stored, wherein the computer program is configured to carry out the steps of any of the above-described method embodiments when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation is obtained, and the reason of the broken fuse of the electromagnetic voltage transformer is determined according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer. Specifically, historical data of the open fuse of the electromagnetic voltage transformer of the substation is acquired, the cause of the open fuse of the electromagnetic voltage transformer is determined based on the historical data, and a suppression measure for suppressing the occurrence of a failure of the open fuse is determined based on the cause of the open fuse of the electromagnetic voltage transformer. By adopting the technical scheme, the problem that corresponding inhibition measures cannot be adopted according to historical data of faults of high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation in the related technology is solved, the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a hardware configuration block diagram of a computer terminal of a method for suppressing an open-circuit fault of an electromagnetic voltage transformer according to an embodiment of the present invention;
fig. 2 is a flowchart of a method of suppressing an open-fuse failure of an electromagnetic voltage transformer according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a secondary harmonic elimination apparatus for suppressing electromagnetic potential transformer open-circuit in accordance with an embodiment of the present invention;
FIG. 4 is a circuit diagram of a secondary harmonic elimination apparatus for suppressing electromagnetic potential transformer open-circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of the principle of a secondary harmonic elimination apparatus suppressing electromagnetic potential transformer tripping in accordance with an embodiment of the present invention;
FIG. 6 is a circuit diagram of a neutral point grounded through a small resistance to inhibit electromagnetic voltage transformer tripping, according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a neutral point crowbar coil ground suppression electromagnetic voltage transformer fuse cutout in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of a 4-solenoid voltage transformer wiring method to inhibit tripping of a solenoid voltage transformer, according to an embodiment of the present invention;
fig. 9 is a block diagram showing a structure of an apparatus for suppressing a fail-safe fault of an electromagnetic type voltage transformer according to another embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The method provided by the embodiment of the application can be executed in a computer terminal or a similar device. Taking an example of the operation on a computer terminal, fig. 1 is a hardware configuration block diagram of the computer terminal of the method for suppressing the open-circuit fault of the electromagnetic voltage transformer according to the embodiment of the present invention. As shown in fig. 1, the computer terminal may include one or more processors 102 (only one is shown in fig. 1), wherein the processors 102 may include, but are not limited to, a Microprocessor (MPU) or a Programmable Logic Device (PLD), and a memory 104 for storing data, and in an exemplary embodiment, the computer terminal may further include a transmission device 106 for communication function and an input/output device 108. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration and is not intended to limit the structure of the computer terminal. For example, the computer terminal may also include more or fewer components than shown in FIG. 1, or have a different configuration with equivalent functionality to that shown in FIG. 1 or with more functionality than that shown in FIG. 1.
The memory 104 may be used to store a computer terminal program, for example, a software program and a module of an application software, such as a computer program corresponding to the method for suppressing the tripping failure of the electromagnetic voltage transformer in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to a computer terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the computer terminal. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In this embodiment, a method for suppressing an open-circuit fault of an electromagnetic voltage transformer is provided, and is applied to the computer terminal, and fig. 2 is a flowchart of a method for suppressing an open-circuit fault of an electromagnetic voltage transformer according to an embodiment of the present invention, where the flowchart includes the following steps:
step S202, acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
step S204, determining a suppression measure for suppressing the fault of the fuse break according to the fuse break reason of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
According to the invention, historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation is obtained, and the reason of the broken fuse of the electromagnetic voltage transformer is determined according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer. Specifically, historical data of the open fuse of the electromagnetic voltage transformer of the substation is acquired, the cause of the open fuse of the electromagnetic voltage transformer is determined based on the historical data, and a suppression measure for suppressing the occurrence of a failure of the open fuse is determined based on the cause of the open fuse of the electromagnetic voltage transformer. By adopting the technical scheme, the problem that corresponding inhibition measures cannot be adopted according to historical data of faults of high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation in the related technology is solved, the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
In step S204, determining a measure for suppressing the occurrence of a failure of the open fuse based on the cause of the open fuse of the electromagnetic voltage transformer includes: in the case that the cause of the open fuse is ferroresonance, the open fuse is suppressed by a secondary resonance elimination device or by a primary resonance elimination device; when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor; when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
The reasons for breaking the fuse of the electromagnetic voltage transformer are generally four: ferromagnetic resonance, low-frequency nonlinear oscillation, high voltage of the electromagnetic voltage transformer, and lightning strike of the electromagnetic voltage transformer. Since the electromagnetic voltage transformer is essentially high voltage of the electromagnetic voltage transformer when struck by lightning, the reasons for breaking the fuse of the electromagnetic voltage transformer can be considered as three: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of the electromagnetic voltage transformer. The electromagnetic voltage transformer has different reasons for breaking the fuse and has corresponding inhibition methods.
It should be noted that if the cause of the open fuse is ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse is suppressed by a secondary resonance elimination device, or the open fuse is suppressed by a primary resonance elimination device; if the cause of the fuse break is low-frequency nonlinear oscillation of an electromagnetic voltage transformer, suppressing the fuse break by grounding through a resistor at a neutral point of the electromagnetic voltage transformer; if the reason for the fuse break is the high voltage of the electromagnetic voltage transformer, the fuse break can be suppressed by grounding the neutral point through the arc suppression coil, or by grounding an electromagnetic voltage transformer in series with the three-phase electromagnetic voltage transformer. By the technical means, the problem of corresponding inhibition measures can be adopted according to the historical data of the fault of the high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation, so that the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
In an alternative embodiment, suppressing the open-circuit by a second harmonic elimination device comprises: and connecting a first resistor in parallel with a high-voltage winding of the electromagnetic voltage transformer to inhibit the fuse from being disconnected, wherein the secondary resonance elimination device comprises: the first resistance.
That is, when the cause of the open fuse is the ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse is suppressed by the secondary resonance elimination device. The second harmonic elimination device is used for restraining the fuse from being disconnected, namely a first resistor is connected in parallel with the high-voltage winding of the electromagnetic voltage transformer, and the mode that the first resistor is connected in parallel with the high-voltage winding of the electromagnetic voltage transformer is shown in fig. 3 and fig. 4. By adopting the secondary resonance elimination device, the power frequency ferromagnetic resonance can be effectively inhibited, and the overvoltage and the overcurrent are both inhibited.
In an alternative embodiment, the neutral point of the electromagnetic voltage transformer is grounded via a resistor to inhibit the open fuse, comprising: and connecting a second resistor in series with a neutral point of the electromagnetic voltage transformer, and grounding the second resistor to inhibit the fuse from being disconnected, wherein the resistance value of the second resistor is smaller than a preset threshold value.
That is, when the cause of the open fuse is the low frequency nonlinear oscillation of the electromagnetic voltage transformer, the open fuse is suppressed by being grounded through a resistance at the neutral point of the electromagnetic voltage transformer. The step of suppressing the fuse disconnection by grounding the neutral point of the electromagnetic voltage transformer via a resistor is to connect a second resistor in series with the neutral point of the electromagnetic voltage transformer and to ground via the second resistor to suppress the fuse disconnection. A second resistor is connected in series with the neutral point of the electromagnetic voltage transformer, and the second resistor is grounded to suppress the fuse breaking, see fig. 6. The neutral point is grounded through a small resistor, so that primary side overcurrent of the electromagnetic voltage transformer can be well inhibited, resonance and low-frequency nonlinear oscillation can be completely avoided, and fuse fusing is prevented.
In an alternative embodiment, the neutral point is grounded via an arc suppression coil to suppress the open fuse, comprising: an arc suppression coil is connected in series with a neutral point of the electromagnetic voltage transformer, and the arc suppression coil is grounded to suppress the fuse breaking.
That is, when the cause of the open fuse is the high voltage of the electromagnetic voltage transformer, the open fuse can be suppressed by grounding the neutral point through the arc suppression coil. The step of suppressing the fuse break through grounding of the neutral point through the arc suppression coil is to connect an arc suppression coil in series with the neutral point of the electromagnetic voltage transformer and to suppress the fuse break through grounding of the arc suppression coil. Fig. 7 shows a manner in which an arc suppression coil is connected in series to a neutral point of the electromagnetic voltage transformer and grounded via the arc suppression coil to suppress the fuse break. After the grounding mode that the system neutral point is grounded through the arc suppression coil is adopted, overvoltage and overcurrent with limited amplitude and three or four power frequency periods only appear in the high-voltage winding of the electromagnetic voltage transformer, and the safety of a high-voltage fuse of the electromagnetic voltage transformer and the safety of the electromagnetic voltage transformer can be ensured
In an alternative embodiment, said cut-off fuse is suppressed by a primary resonance elimination device comprising: a nonlinear resistance harmonic elimination damping device is connected in series with the electromagnetic voltage transformer to restrain the cut-off fuse, wherein the primary harmonic elimination device comprises: the nonlinear resistance resonance elimination damping device is provided.
That is, when the cause of the open fuse is the ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse can be suppressed by the primary resonance elimination device. The primary harmonic elimination device is used for inhibiting the cut-off fuse, namely a nonlinear resistance harmonic elimination damping device is connected in series with the electromagnetic voltage transformer to inhibit the cut-off fuse. The cut-off fuse is restrained by a primary resonance elimination device, and in the process of restraining ferromagnetic resonance, a resonance eliminator needs to absorb a large amount of energy to generate large transient overvoltage which can endanger the insulation of a neutral point on the high-voltage side of the electromagnetic voltage transformer, so that when the primary resonance elimination resistor is used for restraining the fusing phenomenon of the high-voltage fuse, the full-insulation electromagnetic voltage transformer is adopted as far as possible, and a discharge gap is connected in parallel between the resonance eliminator and two ends of the resonance eliminator to protect the insulation of the neutral point on the high-voltage side of the electromagnetic voltage transformer.
In an alternative embodiment, in the case that the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer, connecting an electromagnetic voltage transformer in series with the three-phase electromagnetic voltage transformer to ground to suppress the open fuse includes: and the three-phase electromagnetic voltage transformer is connected with a zero-sequence electromagnetic voltage transformer of a communication signal in series to form a four-phase electromagnetic voltage transformer to inhibit the fuse from being broken.
That is, when the cause of the fuse break is the high voltage of the electromagnetic voltage transformer, an electromagnetic voltage transformer ground may be connected in series to the three-phase electromagnetic voltage transformer to suppress the fuse break. The three-phase electromagnetic voltage transformer is connected with an electromagnetic voltage transformer in series to be grounded so as to inhibit the fuse breaking, namely the three-phase electromagnetic voltage transformer is connected with a zero-sequence electromagnetic voltage transformer of a communication signal in series so as to form a four-phase electromagnetic voltage transformer to inhibit the fuse breaking. An electromagnetic voltage transformer is connected in series with the three-phase electromagnetic voltage transformer to be grounded so as to inhibit the fuse breaking, and the figure 8 shows that. The three-phase electromagnetic voltage transformer is connected with an electromagnetic voltage transformer in series to be grounded to inhibit the fuse from being broken, wherein most of zero-sequence voltage falls on the zero-sequence electromagnetic voltage transformer, the 3-phase electromagnetic voltage transformer cannot bear overvoltage, and meanwhile, because the inductive reactance occupancy ratio of the 3-phase electromagnetic voltage transformer is very small, the asymmetric saturation degree caused by the inconsistency of the 3-phase inductive reactance is avoided, and the saturation problem cannot be caused.
In order to better understand the technical scheme, the invention also provides an alternative embodiment for explaining the technical scheme.
In an alternative embodiment, fig. 3 is a circuit diagram (a) of the second harmonic elimination device for suppressing the electromagnetic voltage transformer fuse according to the embodiment of the present invention, and fig. 4 is a circuit diagram (b) of the second harmonic elimination device for suppressing the electromagnetic voltage transformer fuse according to the embodiment of the present invention, as shown in fig. 3 and fig. 4:
and connecting resistors at two ends of the open delta winding, which is equivalent to connecting a resistor in parallel with the high-voltage winding of the electromagnetic voltage transformer, wherein Req is K13r, and K13 is the transformation ratio between the primary winding and the open delta winding of the electromagnetic voltage transformer. The Req is connected with an excitation inductor of the electromagnetic voltage transformer in parallel, once ferromagnetic resonance occurs in a system, the effect of the inductor is small, resonance energy is released through a resistor, the smaller the connected resistor is, the smaller the influence of the nonlinear inductor on a circuit is, and the more the resonance can be inhibited.
Fig. 5 is a circuit diagram illustrating the principle of suppressing the electromagnetic voltage transformer fuse-breaking by the second harmonic elimination device according to the embodiment of the present invention, as shown in fig. 5:
the principle of the secondary resonance elimination device for inhibiting the electromagnetic voltage transformer from being broken is to acquire the zero sequence voltage amplitude of a system, and when the zero sequence voltage is detected to exceed a setting value, the system is considered to generate resonance, so that the open triangle of the electromagnetic voltage transformer is short-circuited through a resistor in a short time.
After the resonance occurs, if the energy absorber is instantaneously put in order to absorb the resonance energy, the resonance is immediately suppressed, C in fig. 5 is a large-capacity electrolytic capacitor, K1, K2, and K3 are contacts of the relay, D is a full-wave rectifier bridge, and R is a discharge resistor. The device is connected in parallel with two ends of an open-delta winding of the electromagnetic voltage transformer, and three relays are controlled by an integrated circuit. When the system normally operates, the voltage at two ends of an open triangle of the electromagnetic voltage transformer is zero, K2 and K3 are disconnected, K1 is closed, and the C charging state is maintained; when the resonant voltage at two ends of the open-delta winding of the electromagnetic voltage transformer is greater than 30V, K1 is opened, two relays are started by a double-D trigger, K3 and K2 are alternately closed, K3 is closed to discharge a capacitor C, and K2 is closed to connect the capacitor C to two ends of the open-delta in parallel for instant energy absorption and harmonic elimination; when the system is in single-phase grounding, K1 is turned on, and K2 and K3 are turned off after 3-9 times of alternate actions, so that a grounding signal is given.
Fig. 6 is a circuit diagram of an electromagnetic voltage transformer fuse cut-off suppressing by grounding a neutral point via a small resistance according to an embodiment of the present invention, as shown in fig. 6:
when a single-phase earth fault occurs, a small resistor participates in a zero-sequence loop, short-circuit current is large, and a breaker is needed to cut off a fault line in time. In the distribution network, because overhead line takes place single-phase earth fault and mostly is transient fault, can improve power supply reliability through reclosing, and cable run takes place single-phase earth fault and mostly is permanent earth fault, can not establish reclosing but the quick excision trouble circuit, and power supply reliability is guaranteed through setting up section switch or many return lines power supply.
The neutral point is grounded through a small resistor, so that the voltage offset of the neutral point of the system can be effectively fixed, the overvoltage level of the system is limited, on one hand, the overvoltage degree of two ends of a high-voltage winding of the electromagnetic voltage transformer can be reduced, and the harm of ferromagnetic resonance and low-frequency nonlinear oscillation is reduced, and the principle is similar to the principle that the neutral point governs the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer through an arc suppression coil; on the other hand, when the electric network is constructed, equipment with lower insulation level can be selected, so that investment is saved; and a zero sequence component principle can be adopted to form a relay protection rapid selection fault line, and the sensitivity is higher.
Fig. 7 is a circuit diagram of an electromagnetic voltage transformer fuse with a neutral point grounded through an arc suppression coil according to an embodiment of the invention, as shown in fig. 7:
the power system neutral point refers to the neutral point of the star-connected transformer or generator winding of the access system. The arc suppression coil is an inductance coil with an iron core, is connected between a neutral point of the transformer and the ground, is connected with the excitation winding of the electromagnetic voltage transformer in parallel, has the inductance value far smaller than that of the excitation winding of the electromagnetic voltage transformer, can enable redundant free charges on a ground capacitor to enter the ground through the arc suppression coil instead of the excitation inductance of the electromagnetic voltage transformer after single-phase grounding elimination, reduces the impact on the excitation inductance of the electromagnetic voltage transformer, and further effectively prevents the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer. In addition, the arc suppression coil L is small and is directly grounded similar to a system neutral point, so that the voltage offset of the system neutral point can be reduced, the overvoltage degree of the electromagnetic voltage transformer is reduced, the electromagnetic voltage transformer works in a linear region, and the current passing through a high-voltage winding of the electromagnetic voltage transformer is reduced.
In a distribution network below 110kV level in China, if the current of a single-phase earth fault point is small and an electric arc can be automatically extinguished, an ungrounded operation mode is adopted; if the value exceeds a certain value, the electric arc is continuously burnt and cannot be extinguished, a neutral point is grounded through an arc suppression coil, the capacitance current is compensated, and the residual current of a fault point is reduced, so that the electric arc is automatically extinguished. In a 10kV power distribution system, a 20A boundary is typical.
Fig. 8 is a circuit diagram of a primary resonance elimination device for suppressing electromagnetic potential transformer fuse-breaking according to an embodiment of the present invention, as shown in fig. 8:
the 4 electromagnetic voltage transformer wiring inhibition ferroresonance method is that a neutral point on a primary side of a 3-phase electromagnetic voltage transformer is grounded through a zero-sequence electromagnetic voltage transformer with the same type, and the residual windings are in short circuit to form a closed triangle. When single-phase grounding is carried out, the impedance converted to the high-voltage side is only leakage reactance X of the closed-end triangular short circuitlThe value of the voltage divider is small, so that the partial voltage of the electromagnetic voltage transformer is X when the single phase is groundedl/(Xl+3XT0) Wherein X isT0The inductive reactance of the zero-sequence electromagnetic voltage transformer under the phase voltage is realized. Therefore, most of the zero-sequence voltage falls on the zero-sequence electromagnetic voltage transformer, the 3-phase electromagnetic voltage transformer cannot bear overvoltage, and meanwhile, because the inductive reactance occupancy ratio of the 3-phase electromagnetic voltage transformer is very small, the asymmetric saturation degree caused by the inconsistency of the 3-phase inductive reactance is avoided, and the saturation problem cannot be caused.
According to the invention, historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation is obtained, and the reason of the broken fuse of the electromagnetic voltage transformer is determined according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer. Specifically, historical data of the open fuse of the electromagnetic voltage transformer of the substation is acquired, the cause of the open fuse of the electromagnetic voltage transformer is determined based on the historical data, and a suppression measure for suppressing the occurrence of a failure of the open fuse is determined based on the cause of the open fuse of the electromagnetic voltage transformer. By adopting the technical scheme, the problem that corresponding inhibition measures cannot be adopted according to historical data of faults of high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation in the related technology is solved, the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device) to execute the methods described in the embodiments of the present application.
The present embodiment further provides a device for suppressing a tripping failure of an electromagnetic voltage transformer, where the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device that has been given is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 9 is a block diagram showing a structure of an open-fail suppressing apparatus for an electromagnetic type voltage transformer according to another embodiment of the present invention; as shown in fig. 9, includes:
an obtaining module 90, configured to obtain historical data of an open fuse of an electromagnetic voltage transformer of a substation, and determine a cause of the open fuse of the electromagnetic voltage transformer according to the historical data, where the cause of the open fuse of the electromagnetic voltage transformer at least includes one of: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
a determining module 92, configured to determine, according to a cause of an open fuse of the electromagnetic voltage transformer, a suppression measure for suppressing a fault of the open fuse, where the suppression measure includes at least one of: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
According to the invention, historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation is obtained, and the reason of the broken fuse of the electromagnetic voltage transformer is determined according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer; determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer. Specifically, historical data of the open fuse of the electromagnetic voltage transformer of the substation is acquired, the cause of the open fuse of the electromagnetic voltage transformer is determined based on the historical data, and a suppression measure for suppressing the occurrence of a failure of the open fuse is determined based on the cause of the open fuse of the electromagnetic voltage transformer. By adopting the technical scheme, the problem that corresponding inhibition measures cannot be adopted according to historical data of faults of high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation in the related technology is solved, the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
Optionally, the determining module 92 is further configured to suppress the open fuse by a second harmonic elimination device or by a first harmonic elimination device in a case that the cause of the open fuse is ferroresonance; when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor; when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
The reasons for breaking the fuse of the electromagnetic voltage transformer are generally four: ferromagnetic resonance, low-frequency nonlinear oscillation, high voltage of the electromagnetic voltage transformer, and lightning strike of the electromagnetic voltage transformer. Since the electromagnetic voltage transformer is essentially high voltage of the electromagnetic voltage transformer when struck by lightning, the reasons for breaking the fuse of the electromagnetic voltage transformer can be considered as three: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of the electromagnetic voltage transformer. The electromagnetic voltage transformer has different reasons for breaking the fuse and has corresponding inhibition methods.
It should be noted that if the cause of the open fuse is ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse is suppressed by a secondary resonance elimination device, or the open fuse is suppressed by a primary resonance elimination device; if the cause of the fuse break is low-frequency nonlinear oscillation of an electromagnetic voltage transformer, suppressing the fuse break by grounding through a resistor at a neutral point of the electromagnetic voltage transformer; if the reason for the fuse break is the high voltage of the electromagnetic voltage transformer, the fuse break can be suppressed by grounding the neutral point through the arc suppression coil, or by grounding an electromagnetic voltage transformer in series with the three-phase electromagnetic voltage transformer. By the technical means, the problem of corresponding inhibition measures can be adopted according to the historical data of the fault of the high-voltage fuse fusing of the electromagnetic voltage transformer in the transformer substation, so that the high-voltage fuse fusing phenomenon of the electromagnetic voltage transformer is reduced or avoided, the safe operation of a power grid and equipment can be ensured, and the loss is reduced.
Optionally, the determining module 92 is further configured to connect a first resistor in parallel to a high-voltage winding of the electromagnetic voltage transformer to suppress the open circuit, where the second harmonic elimination apparatus includes: the first resistance.
That is, when the cause of the open fuse is the ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse is suppressed by the secondary resonance elimination device. The second harmonic elimination device is used for restraining the fuse from being disconnected, namely a first resistor is connected in parallel with the high-voltage winding of the electromagnetic voltage transformer, and the mode that the first resistor is connected in parallel with the high-voltage winding of the electromagnetic voltage transformer is shown in fig. 3 and fig. 4. By adopting the secondary resonance elimination device, the power frequency ferromagnetic resonance can be effectively inhibited, and the overvoltage and the overcurrent are both inhibited.
Optionally, the determining module 92 is further configured to connect a second resistor in series to a neutral point of the electromagnetic voltage transformer, and suppress the fuse breaking by grounding the second resistor, where a resistance value of the second resistor is smaller than a preset threshold.
That is, when the cause of the open fuse is the low frequency nonlinear oscillation of the electromagnetic voltage transformer, the open fuse is suppressed by being grounded through a resistance at the neutral point of the electromagnetic voltage transformer. The step of suppressing the fuse disconnection by grounding the neutral point of the electromagnetic voltage transformer via a resistor is to connect a second resistor in series with the neutral point of the electromagnetic voltage transformer and to ground via the second resistor to suppress the fuse disconnection. A second resistor is connected in series with the neutral point of the electromagnetic voltage transformer, and the second resistor is grounded to suppress the fuse breaking, see fig. 6. The neutral point is grounded through a small resistor, so that primary side overcurrent of the electromagnetic voltage transformer can be well inhibited, resonance and low-frequency nonlinear oscillation can be completely avoided, and fuse fusing is prevented.
Optionally, the determining module 92 is further configured to connect an arc suppression coil in series to a neutral point of the electromagnetic voltage transformer, and suppress the fuse break by grounding the arc suppression coil.
That is, when the cause of the open fuse is the high voltage of the electromagnetic voltage transformer, the open fuse can be suppressed by grounding the neutral point through the arc suppression coil. The step of suppressing the fuse break through grounding of the neutral point through the arc suppression coil is to connect an arc suppression coil in series with the neutral point of the electromagnetic voltage transformer and to suppress the fuse break through grounding of the arc suppression coil. Fig. 7 shows a manner in which an arc suppression coil is connected in series to a neutral point of the electromagnetic voltage transformer and grounded via the arc suppression coil to suppress the fuse break. After the grounding mode that the system neutral point is grounded through the arc suppression coil is adopted, overvoltage and overcurrent with limited amplitude and three or four power frequency periods only appear in the high-voltage winding of the electromagnetic voltage transformer, and the safety of a high-voltage fuse of the electromagnetic voltage transformer and the safety of the electromagnetic voltage transformer can be ensured
Optionally, the determining module 92 is further configured to connect a nonlinear resistance resonance elimination damping device in series with the electromagnetic voltage transformer to suppress the open circuit, where the primary resonance elimination apparatus includes: the nonlinear resistance resonance elimination damping device is provided.
That is, when the cause of the open fuse is the ferromagnetic resonance of the electromagnetic voltage transformer, the open fuse can be suppressed by the primary resonance elimination device. The primary harmonic elimination device is used for inhibiting the cut-off fuse, namely a nonlinear resistance harmonic elimination damping device is connected in series with the electromagnetic voltage transformer to inhibit the cut-off fuse. The cut-off fuse is restrained by a primary resonance elimination device, and in the process of restraining ferromagnetic resonance, a resonance eliminator needs to absorb a large amount of energy to generate large transient overvoltage which can endanger the insulation of a neutral point on the high-voltage side of the electromagnetic voltage transformer, so that when the primary resonance elimination resistor is used for restraining the fusing phenomenon of the high-voltage fuse, the full-insulation electromagnetic voltage transformer is adopted as far as possible, and a discharge gap is connected in parallel between the resonance eliminator and two ends of the resonance eliminator to protect the insulation of the neutral point on the high-voltage side of the electromagnetic voltage transformer.
Optionally, the determining module 92 is further configured to connect a zero-sequence electromagnetic voltage transformer of a communication signal in series with the three-phase electromagnetic voltage transformer to form a four-phase electromagnetic voltage transformer to suppress the fuse cut.
That is, when the cause of the fuse break is the high voltage of the electromagnetic voltage transformer, an electromagnetic voltage transformer ground may be connected in series to the three-phase electromagnetic voltage transformer to suppress the fuse break. The three-phase electromagnetic voltage transformer is connected with an electromagnetic voltage transformer in series to be grounded so as to inhibit the fuse breaking, namely the three-phase electromagnetic voltage transformer is connected with a zero-sequence electromagnetic voltage transformer of a communication signal in series so as to form a four-phase electromagnetic voltage transformer to inhibit the fuse breaking. An electromagnetic voltage transformer is connected in series with the three-phase electromagnetic voltage transformer to be grounded so as to inhibit the fuse breaking, and the figure 8 shows that. The three-phase electromagnetic voltage transformer is connected with an electromagnetic voltage transformer in series to be grounded to inhibit the fuse from being broken, wherein most of zero-sequence voltage falls on the zero-sequence electromagnetic voltage transformer, the 3-phase electromagnetic voltage transformer cannot bear overvoltage, and meanwhile, because the inductive reactance occupancy ratio of the 3-phase electromagnetic voltage transformer is very small, the asymmetric saturation degree caused by the inconsistency of the 3-phase inductive reactance is avoided, and the saturation problem cannot be caused.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
and S2, determining a suppression measure for suppressing the fault of the fuse protector according to the fuse protector breaking reason of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
and S2, determining a suppression measure for suppressing the fault of the fuse protector according to the fuse protector breaking reason of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
Optionally, in this option, the specific examples in this embodiment may refer to the examples described in the foregoing embodiment and optional implementation, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A method for suppressing an open-circuit fault of an electromagnetic voltage transformer is characterized by comprising the following steps:
acquiring historical data of the broken fuse of an electromagnetic voltage transformer of a transformer substation, and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
2. The method according to claim 1, wherein determining a suppression measure for suppressing the occurrence of a failure of the open fuse based on the cause of the open fuse of the electromagnetic voltage transformer comprises:
in the case that the cause of the open fuse is ferroresonance, the open fuse is suppressed by a secondary resonance elimination device or by a primary resonance elimination device;
when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor;
when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
3. The method of claim 1, wherein suppressing the open fuse by a second harmonic elimination device comprises:
and connecting a first resistor in parallel with a high-voltage winding of the electromagnetic voltage transformer to inhibit the fuse from being disconnected, wherein the secondary resonance elimination device comprises: the first resistance.
4. The method of claim 1, wherein the neutral point of the electromagnetic voltage transformer is grounded via a resistor to inhibit the open fuse, comprising:
and connecting a second resistor in series with a neutral point of the electromagnetic voltage transformer, and grounding the second resistor to inhibit the fuse from being disconnected, wherein the resistance value of the second resistor is smaller than a preset threshold value.
5. The method of claim 1, wherein grounding the neutral point through a crowbar coil suppresses the open fuse, comprising:
an arc suppression coil is connected in series with a neutral point of the electromagnetic voltage transformer, and the arc suppression coil is grounded to suppress the fuse breaking.
6. The method of claim 1, wherein suppressing the open-circuit fuse by a primary harmonic elimination device comprises:
a nonlinear resistance harmonic elimination damping device is connected in series with the electromagnetic voltage transformer to restrain the cut-off fuse, wherein the primary harmonic elimination device comprises: the nonlinear resistance resonance elimination damping device is provided.
7. The method of claim 1, wherein, in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer, connecting an electromagnetic voltage transformer ground in series with the three-phase electromagnetic voltage transformer to inhibit the open fuse comprises:
and the three-phase electromagnetic voltage transformer is connected with a zero-sequence electromagnetic voltage transformer of a communication signal in series to form a four-phase electromagnetic voltage transformer to inhibit the fuse from being broken.
8. An apparatus for suppressing a fail-safe fault of an electromagnetic voltage transformer, comprising:
the acquisition module is used for acquiring historical data of the broken fuse of the electromagnetic voltage transformer of the transformer substation and determining the reason of the broken fuse of the electromagnetic voltage transformer according to the historical data, wherein the reason of the broken fuse of the electromagnetic voltage transformer at least comprises one of the following reasons: ferromagnetic resonance, low-frequency nonlinear oscillation and high voltage of an electromagnetic voltage transformer;
the determination module is used for determining a suppression measure for suppressing the fault of the fuse protector according to the cause of the fuse protector of the electromagnetic voltage transformer, wherein the suppression measure at least comprises one of the following measures: the disconnection is suppressed by a secondary resonance elimination device, the disconnection is suppressed by a primary resonance elimination device, the disconnection is suppressed by grounding a neutral point of the electromagnetic voltage transformer via a resistor, the disconnection is suppressed by grounding the neutral point via an arc suppression coil, and the disconnection is suppressed by connecting one electromagnetic voltage transformer to ground in series in the three-phase electromagnetic voltage transformer in the case where the electromagnetic voltage transformer is a three-phase electromagnetic voltage transformer.
9. The method of claim 8, wherein the determining module is further configured to suppress the open-fuse by a second harmonic elimination device or by a first harmonic elimination device if the cause of the open-fuse is ferroresonance; when the reason of the fuse breaking is low-frequency nonlinear oscillation, the fuse breaking is suppressed by grounding a neutral point of the electromagnetic voltage transformer through a resistor; when the cause of the fuse break is a high voltage of the electromagnetic voltage transformer, the fuse break is suppressed by grounding the neutral point through an arc suppression coil, or by grounding an electromagnetic voltage transformer connected in series to the three-phase electromagnetic voltage transformer.
10. A computer-readable storage medium, comprising a stored program, wherein the program is operable to perform the method of any one of claims 1 to 6.
11. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method of any of claims 1 to 6 by means of the computer program.
CN202011420639.7A 2020-12-07 2020-12-07 Method and device for inhibiting breaking fault of electromagnetic voltage transformer Pending CN113036714A (en)

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