CN118137432A - Fault disconnection method and device for transformer substation, electronic equipment and storage medium - Google Patents
Fault disconnection method and device for transformer substation, electronic equipment and storage medium Download PDFInfo
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- CN118137432A CN118137432A CN202410284238.5A CN202410284238A CN118137432A CN 118137432 A CN118137432 A CN 118137432A CN 202410284238 A CN202410284238 A CN 202410284238A CN 118137432 A CN118137432 A CN 118137432A
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Abstract
The application is suitable for the technical field of power and provides a fault disconnection method and device of a transformer substation, electronic equipment and a storage medium. The fault disconnection method of the transformer substation comprises the following steps: if the high-voltage side of the transformer substation fails, determining a first tide direction of the medium-voltage side of the transformer substation and determining a second tide direction of the low-voltage side of the transformer substation; and according to the first power flow direction and the second power flow direction, performing disconnection control on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer. According to the method, the power supply to be split can be selected from the power supply of the medium-voltage side of the transformer and the power supply of the low-voltage side of the transformer for splitting control according to the first power flow direction of the medium-voltage side of the transformer and the second power flow direction of the low-voltage side of the transformer, and the accuracy of the fault splitting method of the transformer substation is improved.
Description
Technical Field
The application belongs to the technical field of power, and particularly relates to a fault disconnection method and device for a transformer substation, electronic equipment and a storage medium.
Background
When the high-voltage side of the transformer substation breaks down, and the medium-voltage side and the low-voltage side of the transformer have distributed power supplies for continuously providing fault current, the fault current may further raise the offset voltage of the main transformer neutral point, and further may change the insulativity of the main transformer neutral point, so that potential safety hazards are brought.
At present, in order to solve the above problems, when a high-voltage side of a transformer substation fails, all power sources on the medium-voltage side and the low-voltage side of the transformer substation are subjected to disconnection control, which results in that the power sources capable of normally supplying power are also disconnected, so that the accuracy of the existing fault disconnection method of the transformer substation is low.
Disclosure of Invention
In view of the above, the embodiment of the application provides a fault disconnection method, a device, electronic equipment and a storage medium of a transformer substation, so as to solve the technical problem that the existing fault disconnection method of the transformer substation is low in accuracy.
In a first aspect, an embodiment of the present application provides a fault disconnection method of a substation, including:
If the high-voltage side of the transformer substation fails, determining a first tide direction of the medium-voltage side of the transformer substation and determining a second tide direction of the low-voltage side of the transformer substation;
and according to the first power flow direction and the second power flow direction, performing disconnection control on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer.
Optionally, whether the high-voltage side of the transformer fails is determined by:
acquiring the phase voltage of a high-voltage side voltage transformer of the transformer substation;
According to the phase voltage, determining the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer;
And determining whether the high-voltage side of the transformer fails according to the self-generated zero-sequence voltage and the external zero-sequence voltage.
Optionally, the determining whether the high-voltage side of the transformer fails according to the self-generated zero-sequence voltage and the external zero-sequence voltage includes:
and if the self-generated zero sequence voltage and the external zero sequence voltage are both larger than a preset voltage threshold value, determining that the high-voltage side of the transformer fails.
Optionally, the determining the first direction of flow of the medium voltage side of the transformer of the substation includes:
Acquiring a first voltage of a medium-voltage side voltage transformer and a first current of a medium-voltage side current transformer of the transformer substation;
Determining a first power direction of a voltage side in the transformer according to the first voltage and the first current;
And determining a first power flow direction of the pressure side in the transformer according to the first power direction.
Optionally, the determining the second direction of the flow of the low-voltage side of the transformer of the substation includes:
Acquiring a second voltage of a low-voltage side voltage transformer and a second current of a low-voltage side current transformer of the transformer substation;
determining a second power direction of the low-voltage side of the transformer according to the second voltage and the second current;
And determining a second power flow direction of the low-voltage side of the transformer according to the second power direction.
Optionally, the splitting control is performed on the power supply at the medium voltage side of the transformer and the power supply at the low voltage side of the transformer according to the first power flow direction and the second power flow direction, and the method includes:
If the first tide direction is the direction from the medium-voltage side bus to the transformer of the transformer substation, cutting off the power supply of the medium-voltage side of the transformer;
And if the second tide direction is the direction pointing to the transformer from the low-voltage side bus, cutting off the power supply of the low-voltage side of the transformer.
Optionally, the splitting control is performed on the power supply at the medium voltage side of the transformer and the power supply at the low voltage side of the transformer according to the first power flow direction and the second power flow direction, and the method includes:
Determining whether a bus PT wire breakage occurs on a high-voltage side bus of the transformer substation;
and if the bus PT is not disconnected on the high-voltage side bus, performing disconnection control on the power supply on the medium-voltage side of the transformer and the power supply on the low-voltage side of the transformer according to the first power flow direction and the second power flow direction.
In a second aspect, an embodiment of the present application provides a fault disconnection apparatus of a substation, including:
the power flow direction determining unit is used for determining a first power flow direction of a medium voltage side of a transformer of the transformer substation and determining a second power flow direction of a low voltage side of the transformer substation if the high voltage side of the transformer substation fails;
and the disconnection control unit is used for performing disconnection control on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer according to the first power flow direction and the second power flow direction.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements steps in a fault-disconnection method of a substation according to any of the first aspects, when the computer program is executed.
In a fourth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, which when executed by a processor implements the steps in a fault-disconnection method of a substation according to any of the first aspects above.
In a fifth aspect, an embodiment of the present application provides a computer program product, which, when run on a terminal device, causes the terminal device to perform the steps of the fault-disconnection method of a substation as described in any of the first aspects above.
The fault disconnection method, the fault disconnection device, the electronic equipment and the storage medium of the transformer substation provided by the embodiment of the application have the following beneficial effects:
In the fault splitting method for the transformer substation provided by the embodiment of the application, when the high-voltage side of the transformer substation breaks down, the first power flow direction of the medium-voltage side of the transformer substation is determined, the second power flow direction of the low-voltage side of the transformer substation is determined, and then the splitting control is performed on the power supply of the medium-voltage side of the transformer and the power supply of the low-voltage side of the transformer according to the first power flow direction and the second power flow direction. According to the fault splitting method of the transformer substation, the power supply to be split can be determined from the power supply of the medium-voltage side of the transformer and the power supply of the low-voltage side of the transformer according to the first power flow direction of the medium-voltage side of the transformer and the second power flow direction of the low-voltage side of the transformer, and then the power supply to be split is controlled, so that the power supply capable of normally supplying power is prevented from being split, and the accuracy of the fault splitting method of the transformer substation is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an implementation of a fault disconnection method of a transformer substation according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a fault disconnection system of a transformer substation according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a fault disconnection device of a transformer substation according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used in the embodiments of the application is for the purpose of describing particular embodiments of the application only, and is not intended to be limiting of the application. In the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more, and "at least one", "one or more" means one, two or more. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The execution main body of the fault disconnection method of the transformer substation provided by the embodiment of the application can be electronic equipment. The electronic equipment can be arranged in the transformer substation and can execute the steps of the fault disconnection method of the transformer substation.
The fault disconnection method of the transformer substation provided by the embodiment of the application can be applied to fault disconnection of the transformer substation. Specifically, when the fault splitting of the transformer substation is required, the steps of the fault splitting method of the transformer substation provided by the embodiment of the application can be executed through the electronic equipment, so that the power source to be split can be determined from the power source at the medium-voltage side of the transformer and the power source at the low-voltage side of the transformer, then the power source to be split is subjected to splitting control, the power source which can be normally supplied is prevented from being split, and finally the accuracy of the fault splitting method of the transformer substation is improved.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a fault separation method of a transformer substation according to an embodiment of the present application, where the fault separation method of the transformer substation may include S101 to S102, which are described in detail as follows:
in S101, if the transformer high-voltage side of the substation fails, a first direction of flow of the medium-voltage side of the transformer of the substation is determined, and a second direction of flow of the low-voltage side of the transformer of the substation is determined.
In the embodiment of the application, the electronic equipment can detect whether the high-voltage side of the transformer substation fails in real time.
In one possible implementation, the electronic device may determine whether the transformer high-voltage side of the substation is malfunctioning through steps a to c. The details are as follows:
In step a, the phase voltage of the high-side voltage transformer of the substation is obtained.
In the implementation mode, the electronic equipment can acquire the phase voltage of the high-voltage side voltage transformer of the transformer substation through the preset voltage acquisition device, so that the electronic equipment can acquire the phase voltage of the high-voltage side voltage transformer of the transformer substation.
In step b, the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer are determined according to the phase voltage.
In this implementation manner, after the electronic device obtains the phase voltage of the high-voltage side voltage transformer of the transformer substation, the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer can be determined according to the obtained phase voltage of the high-voltage side voltage transformer of the transformer substation.
The specific manner of determining the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer according to the phase voltage of the high-voltage side voltage transformer can be set according to actual requirements, and is not limited herein.
In step c, determining whether the high-voltage side of the transformer has faults according to the self-generated zero-sequence voltage and the external zero-sequence voltage.
In this implementation manner, after determining the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer, the electronic device may determine whether the high-voltage side of the transformer has a fault according to the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer.
In some embodiments, if the electronic device determines that the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer are both greater than the preset voltage threshold, the electronic device may determine that the high-voltage side of the transformer has a fault.
The voltage threshold may be a zero-sequence overvoltage disconnection fixed value (a fixed value used for judging whether a zero-sequence overvoltage phenomenon occurs or not and performing disconnection control after the zero-sequence overvoltage phenomenon occurs), and the specific value of the voltage threshold may be set according to actual requirements.
After the electronic device determines that the transformer high-voltage side of the substation is faulty, the electronic device may determine a first power flow direction of the transformer medium-voltage side of the substation and determine a second power flow direction of the transformer low-voltage side of the substation.
In one possible implementation, the electronic device may determine the first direction of flow of the voltage side in the transformer of the substation through steps d to f. The details are as follows:
in step d, a first voltage of a medium voltage side voltage transformer and a first current of a medium voltage side current transformer of the substation are obtained.
In this implementation manner, when the electronic device needs to determine the first trend direction of the medium-voltage side of the transformer of the substation, the electronic device may collect the first voltage of the medium-voltage side voltage transformer of the substation through a preset voltage collecting device, and may collect the first current of the medium-voltage side current transformer of the substation through a preset current collecting device.
Specifically, the electronic device may collect, through a preset voltage collection device, a direction of a first voltage of the medium-voltage side voltage transformer of the substation, and may collect, through a preset current collection device, a direction of a first current of the medium-voltage side current transformer of the substation.
The types of the first voltage and the first current may be set according to actual requirements, which are not specifically limited herein.
In step e, a first power direction of the voltage side in the transformer is determined from the first voltage and the first current.
In this implementation manner, after the electronic device obtains the first voltage and the first current, the electronic device may determine, according to the first voltage and the first current, a first power direction of a voltage side in the transformer.
Specifically, after the electronic device obtains the first voltage and the first current, the electronic device may determine a first power direction of the voltage side in the transformer according to the direction of the first voltage and the direction of the first current.
In practical applications, the direction of the first voltage and the direction of the first current are the same, and the direction of the first voltage and the direction of the first current may be determined as the first power direction of the voltage side in the transformer.
For example, the direction of the first voltage and the direction of the first current may be both directions in which the medium-voltage side bus points to the transformer of the substation, and the first power direction of the medium-voltage side of the transformer may be determined as the direction in which the medium-voltage side bus points to the transformer of the substation; the direction of the first voltage and the direction of the first current may be directions in which the transformer of the transformer substation points to the medium-voltage side bus, and the first power direction of the medium-voltage side of the transformer may be determined as a direction in which the transformer of the transformer substation points to the medium-voltage side bus.
In step f, a first power flow direction of the pressure side in the transformer is determined based on the first power direction.
In this implementation manner, after determining the first power direction, the electronic device may determine, according to the first power direction, a first power flow direction of the voltage side in the transformer.
Specifically, after determining the first power direction, the electronic device may determine the first power direction as a first power flow direction of the voltage side in the transformer.
For example, if the first power direction of the medium-voltage side of the transformer is the direction in which the medium-voltage side bus points to the transformer of the substation, the first power flow direction of the medium-voltage side of the transformer is the direction in which the medium-voltage side bus points to the transformer of the substation; if the first power direction of the medium-voltage side of the transformer is the direction of the transformer substation pointing to the medium-voltage side bus, the first power flow direction of the medium-voltage side of the transformer is the direction of the transformer substation pointing to the medium-voltage side bus.
In one possible implementation, the electronic device may determine the second direction of flow of the low voltage side of the transformer of the substation through steps g to i. The details are as follows:
In step g, a second voltage of the low-side voltage transformer and a second current of the low-side current transformer of the substation are obtained.
In this implementation manner, when the electronic device needs to determine the second trend direction of the low-voltage side of the transformer of the substation, the electronic device may collect the second voltage of the low-voltage side voltage transformer of the substation through the preset voltage collecting device, and may collect the second current of the low-voltage side current transformer of the substation through the preset current collecting device.
Specifically, the electronic device may collect, through a preset voltage collection device, a direction of the second voltage of the low-voltage side voltage transformer of the substation, and may collect, through a preset current collection device, a direction of the second current of the low-voltage side current transformer of the substation.
The types of the second voltage and the second current may be set according to actual requirements, which are not specifically limited herein.
In step h, a second power direction of the low-voltage side of the transformer is determined from the second voltage and the second current.
In this implementation manner, after the electronic device obtains the second voltage and the second current, the electronic device may determine the second power direction of the low-voltage side of the transformer according to the second voltage and the second current.
Specifically, after the electronic device obtains the second voltage and the second current, the electronic device may determine a second power direction of the low-voltage side of the transformer according to the direction of the second voltage and the direction of the second current.
In practical applications, the direction of the second voltage and the direction of the second current are the same, and the direction of the second voltage and the direction of the second current may be determined as the second power direction of the low voltage side of the transformer.
For example, the direction of the second voltage and the direction of the second current may be both the direction in which the low-voltage side bus line points to the transformer of the substation, and the second power direction of the low-voltage side of the transformer may be determined as the direction in which the low-voltage side bus line points to the transformer of the substation; the direction of the second voltage and the direction of the second current may be directions in which the transformer of the transformer substation points to the low-voltage side bus bar, and the second power direction of the low-voltage side of the transformer may be determined as a direction in which the transformer of the transformer substation points to the low-voltage side bus bar.
In step i, a second power flow direction of the low voltage side of the transformer is determined based on the second power direction.
In this implementation manner, after determining the second power direction, the electronic device may determine the second power flow direction of the low-voltage side of the transformer according to the second power direction.
Specifically, after determining the second power direction, the electronic device may determine the second power direction as a second power flow direction of the low voltage side of the transformer.
For example, if the second power direction of the low-voltage side of the transformer is the direction in which the low-voltage side bus points to the transformer of the substation, the second power flow direction of the low-voltage side of the transformer is the direction in which the low-voltage side bus points to the transformer of the substation; if the second power direction of the low-voltage side of the transformer is the direction in which the transformer of the transformer substation points to the low-voltage side bus, the second power flow direction of the low-voltage side of the transformer is the direction in which the transformer of the transformer substation points to the low-voltage side bus.
In S102, the power supply on the medium voltage side of the transformer and the power supply on the low voltage side of the transformer are controlled to be separated according to the first and second directions of the power flow.
In the embodiment of the application, after the electronic equipment determines the first power flow direction of the medium-voltage side of the transformer and the second power flow direction of the low-voltage side of the transformer, the electronic equipment can perform disconnection control on the power supply of the medium-voltage side of the transformer according to the acquired first power flow direction and can perform disconnection control on the power supply of the low-voltage side of the transformer according to the acquired second power flow direction.
In one possible implementation, the splitting control of the power supply at the medium voltage side of the transformer and the power supply at the low voltage side of the transformer according to the first and second power flow directions may be implemented by steps j to k. The details are as follows:
In step j, if the first power flow direction is a direction from the medium-voltage side bus to the transformer of the substation, the power supply on the medium-voltage side of the transformer is cut off.
In this implementation manner, if the first power flow direction determined by the electronic device is the direction in which the medium voltage side bus points to the transformer of the transformer substation, the power output by the power supply at the medium voltage side of the transformer is greater than the power of the load at the medium voltage side of the transformer, that is, the surplus power exists at the medium voltage side of the transformer, and when the surplus power exists at the medium voltage side of the transformer, the surplus power at the medium voltage side of the transformer can be output to other sides through the transformer, that is, the power supply at the medium voltage side of the transformer can provide fault current, which may raise the offset voltage of the neutral point of the main transformer, and further may change the insulation property of the neutral point of the main transformer, thereby bringing a potential safety hazard.
Based on the first power flow direction determined by the electronic equipment is the direction that the medium voltage side bus points to the transformer of the transformer substation, the power supply of the medium voltage side of the transformer can be cut off, and potential safety hazards caused by the change of the insulativity of the main transformer neutral point can be avoided.
In step k, if the second power flow direction is the direction from the low-voltage side bus to the transformer, the power supply on the low-voltage side of the transformer is cut off.
In this implementation manner, if the second power flow direction determined by the electronic device is the direction in which the low-voltage side bus points to the transformer of the transformer substation, the power output by the power supply at the low-voltage side of the transformer is greater than the power of the load at the low-voltage side of the transformer, that is, the residual power exists at the low-voltage side of the transformer, and when the residual power exists at the low-voltage side of the transformer, the residual power at the low-voltage side of the transformer can be output to other sides through the transformer, that is, the power supply at the low-voltage side of the transformer can provide fault current, which may raise the offset voltage of the neutral point of the main transformer, and further may change the insulation property of the neutral point of the main transformer, thereby bringing a potential safety hazard.
Based on the method, the second power flow direction determined by the electronic equipment is the direction of the low-voltage side bus to the transformer of the transformer substation, and the power supply of the low-voltage side of the transformer can be cut off, so that potential safety hazards caused by the change of the insulativity of the main transformer neutral point can be avoided.
In addition, after the electronic equipment determines that the high-voltage side of the transformer substation fails, the electronic equipment can also perform disconnection control on the power supply of the high-voltage side of the transformer. Specifically, after determining that the transformer high-voltage side of the transformer substation fails, the electronic device may cut off the power supply of the transformer high-voltage side.
In practical applications, the electronic device may cut off the corresponding power supply by sending a trip command to the corresponding interval. Specifically, the electronic device may cut off the power supply of the high voltage side of the transformer by sending a trip command to the interval between the high voltage side of the transformer and the power supply of the high voltage side of the transformer; the electronic device may cut off the power supply of the medium voltage side of the transformer by sending a trip command to the interval between the medium voltage side of the transformer and the power supply of the medium voltage side of the transformer; the electronic device may cut off the power supply of the low voltage side of the transformer by sending a trip command to the interval between the low voltage side of the transformer and the power supply of the low voltage side of the transformer.
In practical application, a bus voltage transformer (Potential Transformer, PT) of a high-voltage side bus of a transformer substation may be disconnected, when the bus PT is disconnected, the electronic equipment can determine that the high-voltage side of the transformer substation is misjudged to be faulty, and if the electronic equipment determines that the high-voltage side of the transformer substation is misjudged to be faulty, the electronic equipment can not need to perform disconnection control on a power supply of a medium-voltage side of the transformer and a power supply of a low-voltage side of the transformer.
Based on this, the electronic device can first determine whether the bus PT of the high-voltage side bus of the substation is broken. Specifically, the electronic device can collect the position of the secondary air-break switch of the high-voltage side voltage transformer, and determine whether the bus PT of the high-voltage side bus of the transformer substation is broken according to the position of the secondary air-break switch of the high-voltage side voltage transformer.
And if the bus PT is not disconnected on the high-voltage side bus, performing disconnection control on the power supply on the medium-voltage side of the transformer and the power supply on the low-voltage side of the transformer according to the first tide direction and the second tide direction.
If the bus PT of the high-voltage side bus breaks, the step of disconnecting and controlling the power supply of the medium-voltage side of the transformer and the power supply of the low-voltage side of the transformer according to the first tide direction and the second tide direction is not executed.
As can be seen from the above, in the fault disconnection method of the transformer substation provided by the embodiment of the present application, when the high voltage side of the transformer substation fails, the first power flow direction of the medium voltage side of the transformer substation is determined, the second power flow direction of the low voltage side of the transformer substation is determined, and then the disconnection control is performed on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer according to the first power flow direction and the second power flow direction. According to the fault splitting method of the transformer substation, the power supply to be split can be determined from the power supply of the medium-voltage side of the transformer and the power supply of the low-voltage side of the transformer according to the first power flow direction of the medium-voltage side of the transformer and the second power flow direction of the low-voltage side of the transformer, and then the power supply to be split is controlled, so that the power supply capable of normally supplying power is prevented from being split, and the accuracy of the fault splitting method of the transformer substation is improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a fault disconnection system of a transformer substation according to an embodiment of the present application. The following describes a fault disconnection method of the substation according to the embodiment corresponding to fig. 1 with reference to fig. 2.
The fault splitting system of the transformer substation provided by the embodiment of the application can comprise other station buses 1, a wire inlet switch 2, a wire inlet switch 3, a hydropower or thermal power supply 4, a high-voltage side bus 5, a transformer high-voltage side switch 6, a high-voltage side voltage transformer 7, a transformer high-voltage side current transformer 8, a transformer 9, a transformer middle-voltage side switch 10, a transformer middle-voltage side current transformer 11, a middle-voltage side voltage transformer 12, a middle-voltage side bus 13, a distributed power supply 14, a transformer low-voltage side current transformer 15, a low-voltage side voltage transformer 16, a transformer low-voltage side switch 17, a low-voltage side bus 18 and a distributed power supply 19.
The transformer 9 is connected with the high-side bus 5 of the transformer substation through the high-side switch 6 of the transformer, the transformer 9 is connected with the medium-voltage side bus 13 of the transformer substation through the medium-side switch 10 of the transformer, and the transformer 9 is connected with the low-voltage side bus 18 of the transformer substation through the low-side switch 17 of the transformer.
The high-voltage side bus 5 is connected with other station buses 1 through the inlet wire switch 2 and the inlet wire switch 3, and the high-voltage side bus 5 is connected with a hydroelectric or thermal power supply 4, and the high-voltage side voltage transformer 7 is arranged on the high-voltage side bus 5.
The medium-voltage side bus 13 is provided with a distributed power supply 14 and other load circuits; the medium voltage side voltage transformer 12 is mounted on the medium voltage side bus bar 13.
The low-voltage side bus 18 is provided with a distributed power supply 19 and other load lines; the low side voltage transformer 16 is mounted on the low side bus bar 18.
The high-voltage side current transformer 8 of the transformer is arranged between the high-side switch 6 of the transformer and the transformer 9; the transformer medium-voltage side current transformer 11 is arranged between the transformer medium-voltage side switch 10 and the transformer 9; the transformer low side current transformer 15 is arranged between the transformer low side switch 17 and the transformer 9.
The electronic equipment can acquire the phase voltage of the high-voltage side voltage transformer 7, then determine the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer 7 according to the phase voltage of the high-voltage side voltage transformer 7, and if the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer 7 are both greater than the zero sequence overvoltage disconnection fixed value, the electronic equipment can determine that the high-voltage side of the transformer has faults.
Then, the electronic device can determine whether the bus PT is disconnected from the high-voltage side bus 5, if the bus PT is disconnected from the high-voltage side bus 5, the electronic device can determine that the high-voltage side of the transformer substation is misjudged to be faulty, and if the bus PT is not disconnected from the high-voltage side bus 5, the electronic device can determine that the high-voltage side of the transformer is indeed faulty.
After the electronic device determines that the high-voltage side of the transformer does fail, the electronic device may collect the first voltage of the medium-voltage side voltage transformer 12 and the first current of the medium-voltage side current transformer 11 of the transformer, determine a first power direction of the medium-voltage side of the transformer according to the first voltage and the first current, and determine a first power flow direction of the medium-voltage side of the transformer. If the determined first power flow direction is the direction in which the medium voltage side bus 13 is directed to the transformer 9, a trip command is sent to the medium voltage side switch 10 of the transformer to perform disconnection control on the medium voltage side power supply (i.e., the distributed power supply 14) of the transformer.
After the electronic device determines that the high-voltage side of the transformer does fail, the electronic device may collect the second voltage of the low-voltage side voltage transformer 16 and the second current of the low-voltage side current transformer 15, determine a second power direction of the low-voltage side of the transformer according to the second voltage and the second current, and determine a second power flow direction of the low-voltage side of the transformer. If the determined second power flow direction is the direction in which the low-voltage side bus 18 is directed to the transformer 9, a trip command is sent to the transformer low-side switch 17 to perform disconnection control on the power source (i.e., the distributed power source 19) on the low-voltage side of the transformer.
After the electronic device determines that the high-voltage side of the transformer does fail, the electronic device can also perform disconnection control on the hydroelectric or thermal power supply 4.
In the prior art, when it is determined that the high-voltage side of the transformer fails, the distributed power supply 14 and the distributed power supply 19 are controlled in a splitting manner, and compared with the prior art, the fault splitting method for the transformer substation provided by the embodiment of the application can determine whether the distributed power supply 14 needs to be controlled in a splitting manner according to the first power flow direction of the medium-voltage side of the transformer, and determine whether the distributed power supply 19 needs to be controlled in a splitting manner according to the second power flow direction of the low-voltage side of the transformer, so that the accuracy of the fault splitting method for the transformer substation is improved.
Based on the fault splitting method of the transformer substation provided by the embodiment, the embodiment of the application further provides a fault splitting device of the transformer substation for implementing the embodiment of the method, please refer to fig. 3, and fig. 3 is a schematic structural diagram of the fault splitting device of the transformer substation provided by the embodiment of the application. As shown in fig. 3, the fault disconnection apparatus 30 of the substation may include: the flow direction determining unit 31 and the disambiguation control unit 32. Wherein:
The flow direction determining unit 31 is configured to determine a first flow direction of a transformer medium voltage side of the transformer of the substation and determine a second flow direction of a transformer low voltage side of the transformer of the substation when the transformer high voltage side of the transformer of the substation fails.
The disconnection control unit 32 is configured to perform disconnection control on the power supply on the medium voltage side of the transformer and the power supply on the low voltage side of the transformer according to the first and second power flow directions.
Optionally, the fault disconnection device 30 of the substation may further include a fault determination unit. Wherein:
the fault determination unit is specifically configured to:
Acquiring the phase voltage of a high-voltage side voltage transformer of a transformer substation;
According to the phase voltage, determining the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer;
And determining whether the high-voltage side of the transformer fails according to the self-generated zero-sequence voltage and the external zero-sequence voltage.
Optionally, the fault determining unit is specifically configured to:
and if the self-generated zero sequence voltage and the external zero sequence voltage are both larger than the preset voltage threshold value, determining that the high-voltage side of the transformer fails.
Optionally, the power flow direction determining unit 31 is specifically configured to:
Acquiring a first voltage of a medium-voltage side voltage transformer and a first current of a medium-voltage side current transformer of a transformer substation;
Determining a first power direction of a voltage side in the transformer according to the first voltage and the first current;
and determining a first power flow direction of the voltage side in the transformer according to the first power direction.
Optionally, the power flow direction determining unit 31 is specifically configured to:
Acquiring a second voltage of a low-voltage side voltage transformer and a second current of a low-voltage side current transformer of the transformer substation;
determining a second power direction of the low-voltage side of the transformer according to the second voltage and the second current;
and determining a second power flow direction of the low-voltage side of the transformer according to the second power direction.
Optionally, the splitting control unit 32 is specifically configured to:
If the first tide direction is the direction from the medium-voltage side bus to the transformer of the transformer substation, cutting off the power supply of the medium-voltage side of the transformer;
And if the second tide direction is the direction from the low-voltage side bus to the transformer, cutting off the power supply of the low-voltage side of the transformer.
Optionally, the splitting control unit 32 is specifically configured to:
Determining whether a bus PT wire breakage occurs on a high-voltage side bus of the transformer substation;
If the bus PT is not broken, the disconnection control is performed on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer according to the first tide direction and the second tide direction.
It should be noted that, because the content of information interaction and execution process between the above units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to the method embodiment specifically, and will not be described herein again.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the application. As shown in fig. 4, the electronic device 4 provided in this embodiment may include: a processor 40, a memory 41 and a computer program 42 stored in the memory 41 and executable on the processor 40, for example a program corresponding to a fault-disconnection method of a substation. The steps in the embodiment of the fault separation method applied to the substation described above are implemented when the processor 40 executes the computer program 42, for example S101 to S102 shown in fig. 1. Or the processor 40 when executing the computer program 42, implements the functions of the modules/units of the fault-splitting device embodiment of the substation described above, such as the functions of the units 31-32 shown in fig. 3.
By way of example, the computer program 42 may be partitioned into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing particular functions for describing the execution of the computer program 42 in the electronic device 4. For example, the computer program 42 may be divided into a power flow direction determining unit and a disconnection controlling unit, and the specific functions of each unit are described with reference to the corresponding embodiment of fig. 3, which is not repeated herein.
It will be appreciated by those skilled in the art that fig. 4 is merely an example of the electronic device 4 and is not limiting of the electronic device 4 and may include more or fewer components than shown, or certain components may be combined, or different components.
The processor 40 may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application Specific Integrated Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the electronic device 4, such as a hard disk or a memory of the electronic device 4. The memory 41 may also be an external storage device of the electronic device 4, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, or a flash memory card (FLASH CARD) provided on the electronic device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the electronic device 4. The memory 41 is used to store computer programs and other programs and data required by the electronic device. The memory 41 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units is illustrated, and in practical application, the above-mentioned functional allocation may be performed by different functional units according to needs, that is, the internal structure of the fault separation device of the substation is divided into different functional units, so as to perform all or part of the above-mentioned functions. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when executed by a processor, performs the steps of the respective method embodiments described above.
The embodiments of the present application provide a computer program product for causing a terminal device to carry out the steps of the respective method embodiments described above when the computer program product is run on the terminal device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A fault-disconnection method of a substation, comprising:
If the high-voltage side of the transformer substation fails, determining a first tide direction of the medium-voltage side of the transformer substation and determining a second tide direction of the low-voltage side of the transformer substation;
and according to the first power flow direction and the second power flow direction, performing disconnection control on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer.
2. The method of claim 1, wherein whether the transformer high-voltage side fails is determined by:
acquiring the phase voltage of a high-voltage side voltage transformer of the transformer substation;
According to the phase voltage, determining the self-generated zero sequence voltage and the external zero sequence voltage of the high-voltage side voltage transformer;
And determining whether the high-voltage side of the transformer fails according to the self-generated zero-sequence voltage and the external zero-sequence voltage.
3. The method of claim 2, wherein determining whether the transformer high-voltage side has failed based on the self-generated zero-sequence voltage and the external zero-sequence voltage comprises:
and if the self-generated zero sequence voltage and the external zero sequence voltage are both larger than a preset voltage threshold value, determining that the high-voltage side of the transformer fails.
4. The method of claim 1, wherein the determining a first direction of flow of a transformer medium voltage side of the substation comprises:
Acquiring a first voltage of a medium-voltage side voltage transformer and a first current of a medium-voltage side current transformer of the transformer substation;
Determining a first power direction of a voltage side in the transformer according to the first voltage and the first current;
And determining a first power flow direction of the pressure side in the transformer according to the first power direction.
5. The method of claim 1, wherein the determining a second direction of flow of the transformer low-voltage side of the substation comprises:
Acquiring a second voltage of a low-voltage side voltage transformer and a second current of a low-voltage side current transformer of the transformer substation;
determining a second power direction of the low-voltage side of the transformer according to the second voltage and the second current;
And determining a second power flow direction of the low-voltage side of the transformer according to the second power direction.
6. The method of claim 1, wherein the splitting control of the power supply on the medium voltage side of the transformer and the power supply on the low voltage side of the transformer according to the first and second power flow directions comprises:
If the first tide direction is the direction from the medium-voltage side bus to the transformer of the transformer substation, cutting off the power supply of the medium-voltage side of the transformer;
And if the second tide direction is the direction pointing to the transformer from the low-voltage side bus, cutting off the power supply of the low-voltage side of the transformer.
7. The method according to any one of claims 1 to 6, wherein the splitting control of the power supply on the medium voltage side of the transformer and the power supply on the low voltage side of the transformer according to the first and second power flow directions comprises:
Determining whether a bus PT wire breakage occurs on a high-voltage side bus of the transformer substation;
and if the bus PT is not disconnected on the high-voltage side bus, performing disconnection control on the power supply on the medium-voltage side of the transformer and the power supply on the low-voltage side of the transformer according to the first power flow direction and the second power flow direction.
8. A fault-disconnection apparatus of a substation, characterized by comprising:
the power flow direction determining unit is used for determining a first power flow direction of a medium voltage side of a transformer of the transformer substation and determining a second power flow direction of a low voltage side of the transformer substation if the high voltage side of the transformer substation fails;
and the disconnection control unit is used for performing disconnection control on the power supply of the medium voltage side of the transformer and the power supply of the low voltage side of the transformer according to the first power flow direction and the second power flow direction.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the fault-splitting method of the substation according to any of claims 1-7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the fault-disconnection method of a substation according to any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410284238.5A CN118137432A (en) | 2024-03-13 | 2024-03-13 | Fault disconnection method and device for transformer substation, electronic equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410284238.5A CN118137432A (en) | 2024-03-13 | 2024-03-13 | Fault disconnection method and device for transformer substation, electronic equipment and storage medium |
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| Publication Number | Publication Date |
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| CN118137432A true CN118137432A (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410284238.5A Pending CN118137432A (en) | 2024-03-13 | 2024-03-13 | Fault disconnection method and device for transformer substation, electronic equipment and storage medium |
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| Country | Link |
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| CN (1) | CN118137432A (en) |
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