Transformer differential protection chip level relay control method, device and equipment
By analyzing the current signal's current indication and power ratio in transformer differential protection, the problem of low reliability in existing technologies is solved, achieving efficient and reliable differential protection judgment.
Patent Information
- Application Number
- CN202511191610.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2025-11-07
AI Technical Summary
Existing transformer differential protection methods suffer from low reliability in determining whether differential protection is needed, and are also computationally complex and inefficient.
By analyzing the current signal on the transformer side within the sampling period, the differential protection result of the transformer is determined using the current identifier, including determining the current signal identifier of the current sampling point and historical sampling points, and combining the power ratio to determine whether differential protection is required.
It improves the reliability and efficiency of transformer differential protection, simplifies the calculation process, reduces the possibility of errors, and allows for earlier action before a fault occurs, thus improving the operating speed of differential protection.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of transformer protection, in particular to a transformer differential protection chip-level relay control method, device and equipment. BACKGROUND
[0002] The transformer is one of the main primary equipments in the power system, and the internal fault of the transformer, especially the short-circuit fault, will cause damage to the transformer, and even burn the transformer, so the transformer needs to be protected, and the most important protection is the transformer differential protection.
[0003] At present, the transformer differential protection method is usually used to protect the transformer, but this method has the problem of low judgment reliability when judging whether the transformer needs differential protection. SUMMARY
[0004] Therefore, it is necessary to provide a transformer differential protection chip-level relay control method, device and equipment capable of improving the judgment reliability in view of the above technical problems.
[0005] In a first aspect, the present application provides a transformer differential protection chip-level relay control method. The method comprises:
[0006] For each transformer side of the transformer, a second flow indicator of the transformer side at a current sampling point is determined according to a first flow indicator of a current signal of each sampling point of the transformer side at a sampling period; each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point;
[0007] A third flow indicator of the transformer at the current sampling point is determined according to the second flow indicator of each transformer side corresponding to the current sampling point;
[0008] A differential protection result of the transformer is determined according to the third flow indicator and the third flow indicator of the transformer at each historical sampling point.
[0009] In one of the embodiments, the differential protection result of the transformer is determined according to the third flow indicator and the third flow indicator of the transformer at each historical sampling point, comprising:
[0010] A first number of continuous sampling points corresponding to the third flow indicator being 1 from the current sampling point is determined;
[0011] The differential protection result of the transformer is determined according to the first number.
[0012] In one of the embodiments, the differential protection result of the transformer is determined according to the first number, comprising:
[0013] determining a ratio of a sum of the power of each transformer side to a rated capacity of the transformer;
[0014] In a case where the first quantity is greater than a preset quantity threshold and the ratio is greater than a preset ratio threshold, determining that a differential protection result of the transformer is open to the differential protection of the transformer.
[0015] In one embodiment, the determining the second flow identification of each transformer side at the current sampling point according to the first flow identification of the current signal of each sampling point of the transformer side at one sampling period includes:
[0016] determining a second quantity of the first flow identification equal to 1 in the first flow identification of the current signal of each sampling point of the transformer side at the one sampling period;
[0017] if the second quantity is not less than one fourth of the quantity of the sampling points in the one sampling period, determining that the second flow identification of the transformer side at the current sampling point is 1.
[0018] In one embodiment, the current signal is a three-phase current signal, and the method further includes:
[0019] for each transformer side, determining a maximum current signal in the three-phase current signal collected by the transformer side at the current sampling point;
[0020] if the maximum current signal is greater than a preset current threshold, determining that the first flow identification of the current signal of the transformer side at the current sampling point is 1; the preset current threshold is determined according to a rated current.
[0021] In one embodiment, the determining the third flow identification of the transformer at the current sampling point according to the second flow identification of each transformer side at the current sampling point includes:
[0022] if at least one of the second flow identification of each transformer side at the current sampling point is 1, determining that the third flow identification of the transformer at the current sampling point is 1.
[0023] In a second aspect, the application also provides a transformer differential protection chip-level relay control device. The device includes:
[0024] a first determining module, configured to determine, for each transformer side of a transformer, a second flow identification of the transformer side at a current sampling point according to a first flow identification of a current signal of each sampling point of the transformer side at one sampling period; each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point;
[0025] a second determination module configured to determine a third flow identification of the transformer at the current sampling point according to the second flow identification of each transformer side at the current sampling point;
[0026] a third determination module configured to determine the differential protection result of the transformer according to the third flow identification and the third flow identification of the transformer at each historical sampling point.
[0027] In a third aspect, a computer device is provided, which includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of any of the above methods are implemented.
[0028] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the steps of any of the above methods are implemented.
[0029] In a fifth aspect, a computer program product is provided, which includes a computer program. When the computer program is executed by a processor, the steps of any of the above methods are implemented.
[0030] The transformer differential protection chip-level relay control method, device and equipment provided in the above embodiments determine the second flow identification of each transformer side at the current sampling point according to the first flow identification of the current signal of each sampling point of the transformer side in one sampling period, the sampling points include the current sampling point and a preset number of historical sampling points before the current sampling point, determine the third flow identification of the transformer at the current sampling point according to the second flow identification of each transformer side at the current sampling point, and determine the differential protection result of the transformer according to the third flow identification and the third flow identification of the transformer at each historical sampling point. In the embodiments, whether differential protection needs to be performed can be determined based on the current signals of multiple sampling points in a sampling period, without the participation of voltage, and the reliability of the determination is improved. BRIEF DESCRIPTION OF DRAWINGS
[0031] Figure 1 is an internal structure diagram of a computer device provided in the embodiments of the present application;
[0032] Figure 2 is a flowchart of a transformer differential protection chip-level relay control method provided in the embodiments of the present application;
[0033] Figure 3 is a flowchart of a differential protection result determination adjustment method provided in the embodiments of the present application;
[0034] Figure 4 is a flowchart of another differential protection result determination adjustment method provided in the embodiments of the present application;
[0035] Figure 5 is a flowchart of a second flow identification determination adjustment method provided by an embodiment of the present application;
[0036] Figure 6 is a flowchart of a first flow identification determination adjustment method provided by an embodiment of the present application;
[0037] Figure 7 is a flowchart of a transformer differential protection opening method provided by an embodiment of the present application;
[0038] Figure 8 is a structural block diagram of a transformer differential protection chip-level relay control device provided by an embodiment of the present application. DETAILED DESCRIPTION
[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.
[0040] The transformer is one of the main primary equipment in the power system. The internal fault of the transformer, especially the short circuit fault, will cause damage to the transformer, and even burn the transformer. Therefore, the transformer needs to be protected, and the most important protection is the transformer differential protection.
[0041] At present, the transformer differential protection method is usually used to protect the transformer. However, when judging whether the transformer needs differential protection, this method needs to rely on voltage and current to make the judgment, so there is a problem of low judgment reliability. Moreover, this judgment method is complex and has large calculation amount, thereby resulting in low judgment efficiency.
[0042] The transformer differential protection chip-level relay control method provided by the embodiments of the present application can be applied to the application environment as shown in Figure 1 . Figure 1 is an internal structure diagram of a computer device provided by an embodiment of the present application. The computer device can be a server, and its internal structure diagram can be as shown in Figure 1As shown in the figure. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with the external terminal through the network connection. The computer program is executed by the processor to implement a transformer differential protection chip-level relay control method.
[0043] Those skilled in the art can understand that, Figure 1 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.
[0044] In one embodiment, as Figure 2 shown, Figure 2 is a flowchart of a transformer differential protection chip-level relay control method provided by an embodiment of the present application. The method can be applied to a computer device in Figure 1 The method includes the following steps:
[0045] S201, for each transformer side of the transformer, according to the first flow indicator of the current signal of each sampling point of the transformer side in one sampling period, determine the second flow indicator of the transformer side at the current sampling point.
[0046] Among them, each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point.
[0047] In one embodiment, the microcomputer protection device can collect the three-phase current signals of each transformer side at each sampling point according to the preset sampling interval. For example, if the transformer can be connected to a maximum of 10 sides, a total of 30 current channels, the collected three-phase current signals of the i-th transformer side are s(i, k, 1), s(i, k, 2), s(i, k, 3). Among them, i=1,2,……,10.
[0048] Alternatively, taking the i-th transformer side of the transformer as an example, the maximum value of the absolute value of the three-phase current signal of the transformer side at the current sampling point can be obtained. Compare the maximum value with the preset current threshold value. If the maximum value is greater than the preset current threshold value, the first flow indicator of the transformer side at the current sampling point is recorded as 1, that is, f1(i, k)=1; if the maximum value is not greater than the preset current threshold value, f1(i, k)=0.
[0049] In the embodiments of the present application, taking one transformer side of a transformer as an example, the first flow existence identifier of each sampling point of the transformer side in the above one sampling period can be obtained, and in the case that the first flow existence identifier of each sampling point meets the first preset condition, the second flow existence identifier of the transformer side at the current sampling point is recorded as 1, i.e. f2(i, k) = 1; otherwise, f2(i, k) = 0.
[0050] For example, the second number of sampling points meeting f1(i, k) = 1 in the first flow existence identifier of each sampling point of the transformer side in the above one sampling period can be counted, and then the second number is compared with the preset number threshold, if the second number is not less than the preset number threshold, the second flow existence identifier of the transformer side at the current sampling point is recorded as 1, i.e. f2(i, k) = 1; otherwise, f2(i, k) = 0. The preset number threshold can be, for example, one fourth of the number of sampling points in one sampling period, i.e. N / 4, where N is the number of sampling points in one sampling period.
[0051] S202, determining the third flow existence identifier of the transformer at the current sampling point according to the second flow existence identifier of each transformer side corresponding to the current sampling point.
[0052] For example, taking the transformer which can access up to 10 sides of 30 current as an example, 10 second flow existence identifiers can be determined at the current sampling point, which are respectively recorded as f2(1, k), f2(2, k), …, f2(10, k). In the case that the 10 second flow existence identifiers meet the second preset condition, the third flow existence identifier of the transformer at the current sampling point is recorded as 1, i.e. f3(k) = 1; otherwise, f3(k) = 0.
[0053] Optionally, the above-mentioned second preset condition can be, for example, that at least one of the 10 second flow existence identifiers is 1, then if at least one of the 10 second flow existence identifiers is 1, the third flow existence identifier of the transformer at the current sampling point is recorded as 1, i.e. f3(k) = 1; otherwise, f3(k) = 0.
[0054] S203, determining the differential protection result of the transformer according to the third flow existence identifier and the third flow existence identifier of the transformer at each historical sampling point.
[0055] In one embodiment, the first number f4(k) of sampling points satisfying f3(k)=1 from the current sampling point to the front in one sampling period is obtained. Then the first number f4(k) is compared with the preset number threshold NumSet. In the case that the first number f4(k) is greater than the preset number threshold NumSet, it is determined that the differential protection result of the transformer is open to the differential protection of the transformer. Otherwise, the second round of judgment is made based on the traditional differential protection method to improve the accuracy and reliability of the judgment.
[0056] Alternatively, the ratio f5(k) of the sum of the power of each transformer side to the rated capacity of the transformer is determined. In the case that the ratio f5(k) is greater than the preset ratio threshold PowSet, it is determined that the differential protection result of the transformer is open to the differential protection of the transformer.
[0057] It should be noted that only one of the above two judgment conditions is met, and the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0058] In the embodiment of the present application, for each transformer side of the transformer, the second flow indicator of the transformer side at the current sampling point is determined according to the first flow indicator of the current signal of each sampling point of the transformer side in one sampling period. Each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point. The third flow indicator of the transformer at the current sampling point is determined according to the second flow indicator of each transformer side at the current sampling point. The differential protection result of the transformer is determined according to the third flow indicator and the third flow indicator of the transformer at each historical sampling point. In the embodiment of the present application, whether differential protection judgment is needed can be determined based on the current signal of multiple sampling points in a sampling period, without the participation of voltage, which improves the reliability of the judgment. And the calculation process of the judgment is simplified, and the efficiency of the judgment is improved.
[0059] Further, since the present application determines whether to open before the transformer fails, the action speed of the differential protection is not affected at all. In addition, the power imbalance criterion is used as an auxiliary open criterion, which further improves the action speed of the differential protection in severe faults.
[0060] Reference Figure 3 , Figure 3 is a flowchart of a differential protection result determination adjustment method provided by the embodiment of the present application. The present embodiment relates to one possible implementation of how to determine the differential protection result of the transformer according to the third flow indicator and the third flow indicator of the transformer at each historical sampling point. Based on the above embodiment, S203 includes the following steps:
[0061] S301, determine a first quantity of continuous sampling points corresponding to the third flow identifier being 1 from the current sampling point.
[0062] In one embodiment, the first quantity of sampling points satisfying f3(k)=1 from the current sampling point in one sampling period can be counted to obtain the first quantity f4(k) of sampling points satisfying f3(k)=1.
[0063] S302, determine the differential protection result of the transformer according to the first quantity.
[0064] Optionally, the first quantity f4(k) can be compared with a preset quantity threshold NumSet, and in the case that the first quantity f4(k) is greater than the preset quantity threshold NumSet, the differential protection result of the transformer is determined to be open to the differential protection of the transformer. Otherwise, a second round of judgment is made based on the traditional differential protection method to improve the accuracy and reliability of the judgment.
[0065] Alternatively, the ratio f5(k) of the sum of the power of each transformer side to the rated capacity of the transformer can also be determined, and in the case that the first quantity f4(k) is greater than the preset quantity threshold NumSet and the ratio f5(k) is greater than a preset ratio threshold PowSet, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0066] In the embodiments of the present application, the first quantity of continuous sampling points corresponding to the third flow identifier being 1 from the current sampling point is determined, and the differential protection result of the transformer is determined according to the first quantity, so that whether differential protection needs to be judged can be determined based on the current signals of the multiple sampling points in the sampling period without the participation of voltage, thereby improving the reliability of the judgment.
[0067] Referring to Figure 4 , Figure 4 is a flowchart of another differential protection result determination and adjustment method provided by the embodiments of the present application. The present embodiment relates to one possible implementation manner of how to determine the differential protection result of the transformer according to the first quantity. On the basis of the above-mentioned embodiments, the S302 mentioned above includes the following steps:
[0068] S401, determine the ratio of the sum of the power of each transformer side to the rated capacity of the transformer.
[0069] S402, in the case that the first quantity is greater than the preset quantity threshold and the ratio is greater than the preset ratio threshold, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0070] Optionally, in the case that the ratio f5(k) is greater than the preset ratio threshold PowSet, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0071] Or, in the case that the first number f4(k) is greater than the preset number threshold NumSet, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0072] Or, in the case that the first number f4(k) is greater than the preset number threshold NumSet, and the ratio f5(k) is greater than the preset ratio threshold PowSet, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0073] That is, only one of the above two judgment conditions is met, and the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0074] In the embodiment of the application, the ratio of the sum of the power of each transformer side to the rated capacity of the transformer is determined; in the case that the first number is greater than the preset number threshold, and the ratio is greater than the preset ratio threshold, the differential protection result of the transformer is determined to be open to the differential protection of the transformer, so that whether differential protection needs to be performed can be determined based on only the current signals of the plurality of sampling points in the sampling period, without the participation of voltage, thereby improving the reliability of the judgment.
[0075] Reference Figure 5 , Figure 5 is a flowchart of a second flow identification determination and adjustment method provided by the embodiment of the application. The embodiment relates to a possible implementation manner of how to determine the second flow identification of the transformer side at the current sampling point according to the first flow identification of the current signal of each sampling point of the transformer side in a sampling period. On the basis of the above embodiment, S201 includes the following steps:
[0076] S501, determining a second number of first flow identifications equal to 1 in the first flow identification of the current signal of each sampling point of the transformer side in a sampling period.
[0077] For example, the second number of sampling points satisfying f1(i, k)=1 in the first flow identification of each sampling point of the transformer side in the above sampling period can be counted.
[0078] S502, if the second number is not less than one fourth of the number of sampling points in the sampling period, determining the second flow identification of the transformer side at the current sampling point to be 1.
[0079] In an embodiment, the first preset condition can be that the second number is not less than N / 4, and if the second number is not less than N / 4, the second flow identification of the transformer side at the current sampling point is recorded as 1, that is, f2(i, k)=1; otherwise, f2(i, k)=0.
[0080] In the embodiment of the present application, the second quantity of the first flow identifiers equal to 1 in the first flow identifiers of the current signals of the transformer side at each sampling point in a sampling period is determined; if the second quantity is not less than one fourth of the quantity of the sampling points in the sampling period, the second flow identifier of the transformer side at the current sampling point is determined as 1, so that the second flow identifier of the transformer side at the current sampling point can be determined based on simple judgment, the calculation process of the judgment is simplified, and the efficiency of the judgment is improved. Meanwhile, the possibility of error is reduced, and the reliability of the judgment is improved.
[0081] Referring to Figure 6 , Figure 6 is a flowchart of a first flow identifier determination and adjustment method provided by the embodiment of the present application. Based on the above embodiment, the method further includes the following steps:
[0082] S601, for each transformer side, the maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point is determined.
[0083] Optionally, taking the i th transformer side of the transformer as an example, the three-phase current signals s(i, k, 1), s(i, k, 2), s(i, k, 3) collected by the i th transformer side at the current sampling point are determined, and then the maximum value in the absolute values of s(i, k, 1), s(i, k, 2), s(i, k, 3) is determined, which is taken as the above maximum current signal.
[0084] S602, if the maximum current signal is greater than a preset current threshold, the first flow identifier of the current signal of the transformer side at the current sampling point is determined as 1.
[0085] The preset current threshold is determined according to the rated current.
[0086] For example, the maximum value can be compared with the preset current threshold, if the maximum value is greater than the preset current threshold, the first flow identifier of the transformer side at the current sampling point is recorded as 1, that is, f1(i, k)=1; if the maximum value is not greater than the preset current threshold, f1(i, k)=0 is recorded.
[0087] Optionally, a preset coefficient can be set, and the product of the preset coefficient and the rated current In is taken as the preset current threshold. For example, the preset coefficient is set to 0.8, and the preset current threshold is 0.8In.
[0088] In the embodiments of the present application, for each transformer side, the maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point is determined; if the maximum current signal is greater than the preset current threshold, the first flow identifier of the current signal of the transformer side at the current sampling point is determined to be 1; the preset current threshold is determined according to the rated current, so that the first flow identifier of the transformer side at the current sampling point can be determined based on a simple judgment, the calculation process of the judgment is simplified, the efficiency of the judgment is improved, the possibility of error is reduced, and the reliability of the judgment is improved.
[0089] On the basis of the above-mentioned embodiments, S202 includes the following steps:
[0090] If at least one of the second flow identifiers corresponding to each transformer side at the current sampling point is 1, the third flow identifier of the transformer at the current sampling point is determined to be 1.
[0091] For example, if the transformer can access up to 10 sides and 30 current channels, 10 second flow identifiers can be determined at the current sampling point, which are denoted as f2(1, k), f2(2, k), …, f2(10, k) respectively. If at least one of the 10 second flow identifiers is 1, the third flow identifier of the transformer at the current sampling point is denoted as 1, that is, f3(k)=1; otherwise, f3(k)=0.
[0092] In the embodiments of the present application, if at least one of the second flow identifiers corresponding to each transformer side at the current sampling point is 1, the third flow identifier of the transformer at the current sampling point is determined to be 1, so that the third flow identifier of the transformer at the current sampling point can be determined based on a simple judgment, the calculation process of the judgment is simplified, the efficiency of the judgment is improved, the possibility of error is reduced, and the reliability of the judgment is improved.
[0093] Reference Figure 7 , Figure 7 is a flowchart of a transformer differential protection opening method provided by the embodiments of the present application. The method includes the following steps:
[0094] S701, three-phase current signals collected by a transformer side at a current sampling point are obtained.
[0095] S702, if the maximum current signal in the three-phase current signals is greater than 0.8In, the first flow identifier f1(i, k) of the current signal of the transformer side at the current sampling point is determined to be 1.
[0096] S703, if the second number of the first flow identifiers equal to 1 in the first flow identifiers of N current signals of the transformer side in a sampling period is not less than N / 4, the second flow identifier f2(i, k) of the transformer side at the current sampling point is determined to be 1.
[0097] S704, if at least one of the second current-carrying identifiers corresponding to the current sampling point on each transformer side is 1, then the third current-carrying identifier f3(k) of the transformer at the current sampling point is determined to be 1.
[0098] S705, determine the first number f4(k) of consecutive sampling points corresponding to the third flow identifier 1 starting from the current sampling point.
[0099] S706, determine the ratio f5(k) of the sum of the power on each transformer side to the rated capacity of the transformer.
[0100] S707, if f4(k) is greater than a preset quantity threshold or f5(k) is greater than a preset ratio threshold, determine that the differential protection result of the transformer is to open the differential protection of the transformer.
[0101] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0102] Based on the same inventive concept, this application also provides a transformer differential protection chip-level relay control device for implementing the above-mentioned transformer differential protection chip-level relay control method. The solution provided by this device is similar to the implementation described in the above method. Therefore, the specific limitations of one or more embodiments of the transformer differential protection chip-level relay control device provided below can be found in the limitations of the transformer differential protection chip-level relay control method described above, and will not be repeated here.
[0103] In one embodiment, such as Figure 8 As shown, Figure 8 This is a structural block diagram of a transformer differential protection chip-level relay control device provided in an embodiment of this application. The device 800 includes:
[0104] The first determining module 801 is configured to determine, for each transformer side of the transformer, a second flow existence identifier of the transformer side at a current sampling point according to first flow existence identifiers of current signals of each sampling point of the transformer side in a sampling period; the sampling points include the current sampling point and a preset number of historical sampling points before the current sampling point.
[0105] The second determining module 802 is configured to determine a third flow existence identifier of the transformer at the current sampling point according to the second flow existence identifiers of each transformer side at the current sampling point.
[0106] The third determining module 803 is configured to determine a differential protection result of the transformer according to the third flow existence identifier and the third flow existence identifiers of the transformer at each historical sampling point.
[0107] In one of the embodiments, the third determining module 803 includes:
[0108] The first determining unit is configured to determine a first number of continuous sampling points corresponding to the third flow existence identifier being 1 from the current sampling point.
[0109] The second determining unit is configured to determine the differential protection result of the transformer according to the first number.
[0110] In one of the embodiments, the second determining unit is specifically configured to determine a ratio of a sum result of the power of each transformer side to a rated capacity of the transformer; and in a case where the first number is greater than a preset number threshold and the ratio is greater than a preset ratio threshold, determine that the differential protection result of the transformer is open to the differential protection of the transformer.
[0111] In one of the embodiments, the first determining module 801 includes:
[0112] The second determining unit is configured to determine a second number of the first flow existence identifiers equal to 1 in the first flow existence identifiers of the current signals of each sampling point of the transformer side in the sampling period.
[0113] The third determining unit is configured to determine that the second flow existence identifier of the transformer side at the current sampling point is 1 if the second number is not less than one fourth of the number of the sampling points in the sampling period.
[0114] In one of the embodiments, the apparatus 800 further includes:
[0115] The fourth determining module is configured to determine, for each transformer side, a maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point.
[0116] The fifth determining module is configured to determine that the first flow existence identifier of the current signal of the transformer side at the current sampling point is 1 if the maximum current signal is greater than a preset current threshold; the preset current threshold is determined according to a rated current.
[0117] In one of the embodiments, the second determining module 802 comprises:
[0118] A sixth determining module is configured to determine that the third flow existence identifier of the transformer at the current sampling point is 1 if at least one of the second flow existence identifiers corresponding to the transformer side at the current sampling point is 1.
[0119] The modules in the transformer differential protection chip-level relay control device can be realized by software, hardware, or a combination thereof. The modules can be embedded in or independent of the processor in the computer device in hardware form, or stored in the memory in the computer device in software form, so as to be called and executed by the processor.
[0120] In one of the embodiments, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the following steps:
[0121] For each transformer side of the transformer, a second flow existence identifier of the transformer side at a current sampling point is determined according to first flow existence identifiers of current signals of the transformer side at each sampling point in a sampling period, wherein the sampling points include the current sampling point and a preset number of historical sampling points before the current sampling point.
[0122] A third flow existence identifier of the transformer at the current sampling point is determined according to the second flow existence identifiers of the transformer side at the current sampling point.
[0123] A differential protection result of the transformer is determined according to the third flow existence identifier and the third flow existence identifiers of the transformer at each historical sampling point.
[0124] In one of the embodiments, the processor executes the computer program to further implement the following steps:
[0125] A first number of continuous sampling points corresponding to the third flow existence identifier being 1 is determined from the current sampling point.
[0126] The differential protection result of the transformer is determined according to the first number.
[0127] In one of the embodiments, the processor executes the computer program to further implement the following steps:
[0128] A ratio of a sum of powers of the transformer sides to a rated capacity of the transformer is determined.
[0129] In a case where the first number is greater than a preset number threshold and the ratio is greater than a preset ratio threshold, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0130] In one embodiment, the processor, when executing the computer program, also implements the following steps:
[0131] determining a second number of first flow indicators equal to 1 in the first flow indicators of the current signals of the transformer side at each sampling point in a sampling period;
[0132] if the second number is not less than one fourth of the number of sampling points in the sampling period, determining that the second flow indicator of the transformer side at the current sampling point is 1.
[0133] In one embodiment, the processor, when executing the computer program, also implements the following steps:
[0134] for each transformer side, determining a maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point;
[0135] if the maximum current signal is greater than a preset current threshold, determining that the first flow indicator of the transformer side at the current sampling point is 1; the preset current threshold is determined according to the rated current.
[0136] In one embodiment, the processor, when executing the computer program, also implements the following steps:
[0137] if at least one of the second flow indicators corresponding to the current sampling point of each transformer side is 1, determining that the third flow indicator of the transformer at the current sampling point is 1.
[0138] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the following steps:
[0139] for each transformer side of the transformer, determining a second flow indicator of the transformer side at the current sampling point according to first flow indicators of the current signals of the transformer side at each sampling point in a sampling period; each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point;
[0140] determining a third flow indicator of the transformer at the current sampling point according to the second flow indicators corresponding to the current sampling point of each transformer side;
[0141] determining a differential protection result of the transformer according to the third flow indicator and the third flow indicators of the transformer at each historical sampling point.
[0142] In one embodiment, the computer program, when executed by the processor, also implements the following steps:
[0143] determining a first number of continuous sampling points corresponding to the third flow indicator being 1 from the current sampling point;
[0144] determining a differential protection result of the transformer according to the first number.
[0145] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:
[0146] determining a ratio of a sum of the power of each transformer side to a rated capacity of the transformer;
[0147] in a case that the first number is greater than a preset number threshold and the ratio is greater than a preset ratio threshold, determining that a differential protection result of the transformer is open to the differential protection of the transformer.
[0148] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:
[0149] determining a second number of first flow identifiers equal to 1 in the first flow identifiers of the current signals of each sampling point of each transformer side in a sampling period;
[0150] if the second number is not less than one fourth of the number of sampling points in the sampling period, determining that the second flow identifier of the transformer side at the current sampling point is 1.
[0151] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:
[0152] for each transformer side, determining a maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point;
[0153] if the maximum current signal is greater than a preset current threshold, determining that the first flow identifier of the current signal of the transformer side at the current sampling point is 1; the preset current threshold is determined according to a rated current.
[0154] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:
[0155] if at least one of the second flow identifiers corresponding to the current sampling point of each transformer side is 1, determining that the third flow identifier of the transformer at the current sampling point is 1.
[0156] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:
[0157] for each transformer side of the transformer, determining a second flow identifier of the transformer side at the current sampling point according to first flow identifiers of current signals of each sampling point of the transformer side in a sampling period; each sampling point includes the current sampling point and a preset number of historical sampling points before the current sampling point;
[0158] determining a third flow identifier of the transformer at the current sampling point according to the second flow identifiers corresponding to the current sampling point of each transformer side;
[0159] According to the third flow identification, the third flow identification of the transformer at each historical sampling point, the differential protection result of the transformer is determined.
[0160] In one embodiment, the computer program, when executed by the processor, further implements the following steps:
[0161] Determine the first number of continuous sampling points corresponding to the third flow identification being 1 from the current sampling point;
[0162] According to the first number, the differential protection result of the transformer is determined.
[0163] In one embodiment, the computer program, when executed by the processor, further implements the following steps:
[0164] Determine the ratio of the sum of the power of each transformer side to the rated capacity of the transformer;
[0165] If the first number is greater than the preset number threshold, and the ratio is greater than the preset ratio threshold, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
[0166] In one embodiment, the computer program, when executed by the processor, further implements the following steps:
[0167] Determine the second number of the first flow identification equal to 1 in the first flow identification of the current signal of each sampling point of the transformer side in a sampling period;
[0168] If the second number is not less than one fourth of the number of sampling points in a sampling period, the second flow identification of the transformer side at the current sampling point is determined to be 1.
[0169] In one embodiment, the computer program, when executed by the processor, further implements the following steps:
[0170] For each transformer side, determine the maximum current signal in the three-phase current signal collected by the transformer side at the current sampling point;
[0171] If the maximum current signal is greater than a preset current threshold, the first flow identification of the current signal of the transformer side at the current sampling point is determined to be 1; the preset current threshold is determined according to the rated current.
[0172] In one embodiment, the computer program, when executed by the processor, further implements the following steps:
[0173] If at least one of the second flow identification corresponding to the current sampling point of each transformer side is 1, the third flow identification of the transformer at the current sampling point is determined to be 1.
[0174] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.
[0175] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.
[0176] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A transformer differential protection chip-level relay control method, characterized by, The method comprises: For each transformer side of a transformer, a second flow indicator of the transformer side at a current sampling point is determined according to a first flow indicator of current signals of each sampling point of the transformer side in a sampling period; each of the sampling points comprises the current sampling point and a preset number of historical sampling points before the current sampling point; A third flow indicator of the transformer at the current sampling point is determined according to the second flow indicators of each of the transformer sides at the current sampling point; A differential protection result of the transformer is determined according to the third flow indicator and the third flow indicators of the transformer at each of the historical sampling points.
2. The method of claim 1, wherein, The determination of the differential protection result of the transformer according to the third flow indicator and the third flow indicators of the transformer at each of the historical sampling points comprises: A first number of continuous sampling points corresponding to the third flow indicator being 1 is determined from the current sampling point; The differential protection result of the transformer is determined according to the first number.
3. The method of claim 2, wherein, The determination of the differential protection result of the transformer according to the first number comprises: A ratio of a sum of powers of each of the transformer sides to a rated capacity of the transformer is determined; In a case where the first number is greater than a preset number threshold and the ratio is greater than a preset ratio threshold, the differential protection result of the transformer is determined to be open to the differential protection of the transformer.
4. The method according to any one of claims 1 to 3, characterized in that, The determination of the second flow indicator of the transformer side at the current sampling point according to the first flow indicators of the current signals of each sampling point of the transformer side in the sampling period comprises: A second number of the first flow indicators equal to 1 in the first flow indicators of the current signals of each sampling point of the transformer side in the sampling period is determined; If the second number is not less than one fourth of the number of sampling points in the sampling period, the second flow indicator of the transformer side at the current sampling point is determined to be 1.
5. The method of claim 4, wherein, The current signals are three-phase current signals, and the method further comprises: For each of the transformer sides, a maximum current signal in the three-phase current signals collected by the transformer side at the current sampling point is determined; If the maximum current signal is greater than a preset current threshold, the first flow indicator of the current signal of the transformer side at the current sampling point is determined to be 1; the preset current threshold is determined according to a rated current.
6. The method according to any one of claims 1 to 3, characterized in that, The determination of the third flow indicator of the transformer at the current sampling point according to the second flow indicators of each of the transformer sides at the current sampling point comprises: If at least one of the second flow indicators of each of the transformer sides at the current sampling point is 1, the third flow indicator of the transformer at the current sampling point is determined to be 1.
7. A transformer differential protection chip level relay control device, characterized by, The apparatus comprises: A first determination module is configured to determine, for each transformer side of a transformer, a second flow indicator of the transformer side at a current sampling point according to a first flow indicator of current signals of each sampling point of the transformer side in a sampling period; each of the sampling points comprises the current sampling point and a preset number of historical sampling points before the current sampling point; A second determining module is configured to determine a third flow identification of the transformer at the current sampling point according to a second flow identification corresponding to the current sampling point of each transformer side; A third determining module is configured to determine a differential protection result of the transformer according to the third flow identification and third flow identifications of the transformer at the historical sampling points. 8.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-7. The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.