High-speed rail maintenance and management traction transformer ratio differential characteristic generation method and system

Abstract

The invention discloses a high-speed rail maintenance and management traction transformer ratio differential characteristic generation method and system, and relates to the technical field of traction transformer detection, and the method comprises the steps: obtaining the model and specification of a target object, and determining the ratio differential basic information of the target object in combination with the work information of the target object; and according to the ratio differential basic information of the target object, making a ratio differential characteristic basic graph of the target object. According to the method, the current condition of the target object is determined by sampling the transformer model specification and current of the target object in advance, then the test current is formulated according to the current condition of the target object, and the action interval of the target object is determined according to the performance condition of the test current in the target object; the braking and differential critical curve of the target object is determined according to the action interval of the target object, and then the performance of the target object is clearly known. Therefore, the defect that the performance of the traction transformer cannot be clearly mastered in the prior art is effectively overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of traction transformer detection, and in particular to a method and system for generating the ratio differential characteristics of a high-speed rail maintenance traction transformer. Background Art

[0002] There are many types of traction transformers in high-speed rail maintenance, and due to the differences in their internal structures, the diversity and complexity of the ratio differential protection principle, the technical requirements for testers are relatively high, and it is difficult to achieve a complete test. At the same time, the ratio differential protection test of the traction transformer in high-speed rail maintenance is limited by the tester's own operation level and the lack of thorough understanding of the protection principle. Usually, a single-phase current is simply loaded, and the protection device executes a differential action. Such an operation is random and cannot well grasp the performance of the traction transformer itself, and cannot provide effective reference for subsequent maintenance and management. Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcoming in the prior art that the performance of the traction transformer cannot be clearly grasped, and to propose a method and system for generating the ratio differential characteristics of a high-speed rail maintenance traction transformer.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention provides a method for generating the ratio differential characteristics of a high-speed rail maintenance traction transformer in the first aspect, including:

[0006] Obtain the model specifications of the target object, and combine the working information of the target object to determine the ratio differential basic information of the target object;

[0007] Make a basic diagram of the ratio differential characteristics of the target object according to the ratio differential basic information of the target object;

[0008] Determine the action interval test information of the target object according to the basic diagram of the ratio differential characteristics of the target object;

[0009] Transmit the action interval test information of the target object to the target object to obtain the action feedback information of the target object;

[0010] Determine the ratio differential characteristic action interval information of the target object according to the action feedback information of the target object;

[0011] Formulate the ratio differential characteristic diagram of the target object according to the ratio differential characteristic action interval information of the target object and in combination with the basic diagram of the ratio differential characteristics of the target object.

[0012] In some feasible solutions, the method for obtaining the action feedback information of the target object includes:

[0013] Determine the action sampling calculation current of the target object respectively according to the model specifications of the target object;

[0014] Determine the action sampling calculation current balance adjustment information of the target object according to the model specifications of the target object and in combination with the action sampling calculation current of the target object;

[0015] Process the action sampling calculation current of the target object respectively according to the current balance adjustment information of the target object to determine the action sampling output current of the target object;

[0016] Transmit the action sampling output current of the target object to the target object to determine the action actual measurement information of the target object;

[0017] Determine the action feedback information of the target object according to the action actual measurement information of the target object and in combination with the model specifications of the target object.

[0018] In some feasible solutions, the method for respectively determining the action sampling calculation current of the target object includes:

[0019] Process the three-phase data on the high-voltage side of the target object respectively:

[0020]

[0021] In Equation 1, are the calculation currents for differential and braking of phases A, B, and C on the high-voltage side of the target object respectively, are the sampling currents of phases A, B, and C on the high-voltage side of the target object respectively;

[0022] Process the real-time current data on the low-voltage side of the target object respectively:

[0023]

[0024] In Equation 2, are the sampling currents of phases T1 and F1 on the low-voltage side of the target object respectively, are the sampling currents of phases T2 and F2 on the low-voltage side of the target object respectively, is the calculation current for differential and braking of phases T1 and F1 on the low-voltage side of the target object, is the calculation current for differential and braking of phases T2 and F2 on the low-voltage side of the target object.

[0025] In some feasible solutions, the method for determining the action sampling calculation current balance adjustment information of the target object includes:

[0026] Taking the current on the high-voltage side of the target object as the reference, perform balance adjustment on the current on the low-voltage side of the target object, specifically:

[0027]

[0028] In Formulas 3 to 5, k is the turns ratio of the transformer winding of the target object, K pha is the balance coefficient of phase a of the transformer of the target object, K phb is the balance coefficient of phase b of the transformer of the target object, U E is the rated line voltage of the high-voltage side bus of the target object, U e is the rated voltage of the low-voltage side bus of the target object, n H is the transformation ratio of the current transformer on the high-voltage side, n La is the transformation ratio of the current transformer of phase a on the low-voltage side, n Lb is the transformation ratio of the current transformer of phase b on the low-voltage side.

[0029] In some feasible solutions, the method for determining the action sampling output current of the target object includes:

[0030] The differential current calculation formula of the target object is:

[0031]

[0032] The braking current calculation formula of the target object is:

[0033]

[0034] In Formulas 6 and 7, is the differential current of phase A of the target object, is the braking current of phase A of the target object; is the differential current of phase B of the target object, is the braking current of phase B; is the differential current of phase C of the target object, is the braking current of phase C;

[0035] According to Formulas 6 and 7, determine the action sampling output current of the target object respectively.

[0036] In some feasible solutions, the method for formulating the ratio differential characteristic diagram of the target object includes:

[0037] According to the action feedback information of at least two different target objects, and in combination with the ratio differential basic information of the target object, determine the braking interval and differential interval of the target object;

[0038] According to the braking interval and differential interval of the target object, and in combination with the action measured information of multiple different target objects, determine the ratio differential characteristic action interval of the target object;

[0039] Determine the action distribution of the target object based on the ratio differential characteristic basic diagram of the target object, in combination with the braking interval and differential interval of the target object, as well as the ratio differential characteristic action interval of the target object;

[0040] Based on the action distribution of the target object and in combination with the ratio differential characteristic basic diagram of the target object, determine the ratio differential characteristic diagram of the target object.

[0041] In some feasible solutions, the method for determining the braking interval and differential interval of the target object includes:

[0042] Determine the ratio differential protection action equation of the target object according to the model specification of the target object and the working information of the target object:

[0043]

[0044] In Equation 8, I CDN is any one of the differential currents of the three phases of the target object, I ZDN is any one of the braking currents of the three phases of the target object, I CD>N is the setting value of the ratio differential starting current of any one of the three phases of the target object, I A1 、I A2 are respectively the setting values of the first-stage and second-stage braking currents of any one of the three phases, K res1 、K res2 are two-stage ratio coefficients;

[0045] According to Equation 8, determine the braking interval and differential interval of the target object respectively.

[0046] In some feasible solutions, the method for determining the action distribution of the target object includes:

[0047] Determine the braking current interval of the target object according to the braking interval and differential interval of the target object;

[0048] According to the braking current interval of the target object and in combination with the action measured information of the target object, determine at least two differential action change situations of the target object;

[0049] According to the differential action change situation of the target object, use the dichotomy method to determine the action boundary curve of the target object;

[0050] According to the action boundary curve of the target object, determine the ratio differential characteristic action interval.

[0051] In some feasible solutions, the method for determining the ratio differential characteristic action interval includes:

[0052] Determine the search interval range of the target object according to the braking interval and differential interval of the target object;

[0053] Based on the search range of the target object and combined with the ratio differential basic information of the target object, determine the starting value of the search braking of the target object, and determine the action sampling output current of the starting value of the search braking;

[0054] Transmit the action sampling output current of the starting value of the search braking of the target object into the target object to determine the action measured information of the target object;

[0055] Repeat the above steps using the dichotomy method until the action measured information of the target object meets the differential action critical point, and determine the action boundary curve of the target object.

[0056] The present invention also provides a system for generating the ratio differential characteristics of a high-speed railway maintenance traction transformer in the second aspect. It adopts a method for generating the ratio differential characteristics of a high-speed railway maintenance traction transformer as described in any one of the first aspect. The generating system further includes:

[0057] A sampling module, which is used to determine the ratio differential basic information of the target object;

[0058] An action feedback module, which is used to obtain the action feedback information of the target object;

[0059] A graphic generation module, which is used to formulate the ratio differential characteristic diagram of the target object according to the ratio differential characteristic action interval information of the target object and combined with the ratio differential characteristic basic diagram of the target object.

[0060] The beneficial effects of the present invention are:

[0061] The present invention first samples the transformer model specifications of the target object and the current, determines the current situation of the target object, then formulates the test current according to the current situation of the target object, determines the action interval of the target object according to the performance of the test current on the target object, determines the braking and differential critical curves of the target object according to the action interval of the target object, and then clearly understands the performance of the target object. That is, it effectively solves the shortcoming in the above-mentioned existing technology that the performance of the traction transformer cannot be clearly grasped. Description of the Drawings

[0062] Figure 1 It is the overall flow schematic diagram of a method for generating the ratio differential characteristics of a high-speed railway maintenance traction transformer provided in the embodiment of the present invention;

[0063] Figure 2 It is the partial flow schematic diagram of a method for generating the ratio differential characteristics of a high-speed railway maintenance traction transformer provided in the embodiment of the present invention;

[0064] Figure 3It is the basic diagram of the ratio differential characteristic of a method for generating the ratio differential characteristic of a high-speed railway maintenance traction transformer provided in an embodiment of the present invention;

[0065] Figure 4 It is the ratio differential characteristic diagram of a method for generating the ratio differential characteristic of a high-speed railway maintenance traction transformer provided in an embodiment of the present invention. Specific embodiments

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0067] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0068] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0070] Refer to Figures 1 to 4, in order to solve the above-mentioned drawbacks in the prior art that the performance of the traction transformer cannot be clearly grasped, in this embodiment of the present invention, a method for generating the ratio differential characteristic of a high-speed rail maintenance traction transformer is provided in the first aspect. The generation method determines the current situation of the target object by pre-sampling the transformer model specifications of the target object and the current, and then formulates a test current according to the current situation of the target object. According to the performance of the test current on the target object, the action interval of the target object is determined. According to the action interval of the target object, the braking and differential critical curves of the target object are determined, and then the performance of the target object is clearly understood. That is, it effectively solves the above-mentioned drawbacks in the prior art that the performance of the traction transformer cannot be clearly grasped.

[0071] Specifically, the generation method includes: obtaining the model specifications of the target object and combining the working information of the target object to determine the basic ratio differential information of the target object; that is, the current performance and the current action state of the target object can be determined based on the current high-voltage side and low-voltage side current data of the target object. Then, according to the basic ratio differential information of the target object, a basic ratio differential characteristic diagram of the target object is made; that is, the current situation of the ratio differential protection action characteristic of the target object can be determined according to the specification model, current performance and current action state of the target object. Then, according to the basic ratio differential characteristic diagram of the target object, the action interval test information of the target object is determined; that is, here, according to the current situation of the ratio differential protection action characteristic of the target object, the calculation current data for calculating the subsequent differential and braking boundary curves of its performance can be pre-formulated. Then, the action interval test information of the target object is respectively sent to the target object to obtain the action feedback information of the target object; that is, here, the calculation current data for calculating the subsequent differential and braking boundary curves of its performance is input into the target object, and the action performance of the target object in different calculation current data is respectively determined, such as whether the protection device in the target object brakes, differentiates or is between the two. That is, here, according to the action feedback information of the target object, the ratio differential characteristic action interval information of the target object is determined; finally, according to the ratio differential characteristic action interval information of the target object and combining the basic ratio differential characteristic diagram of the target object, the ratio differential characteristic diagram of the target object is formulated.

[0072] In this embodiment, for the convenience of understanding how to determine the action feedback information of the target object, the following description is provided. Specifically, the method for obtaining the action feedback information of the target object includes: directly determining the action sampling calculation current of the target object according to the model specifications of the target object; then, according to the model specifications of the target object and in combination with the action sampling calculation current of the target object, determining the action sampling calculation current balance adjustment information of the target object; then, according to the current balance adjustment information of the target object, respectively processing the action sampling calculation current of the target object to determine the action sampling output current of the target object; delivering the action sampling output current of the target object to the target object to determine the action measured information of the target object; and according to the action measured information of the target object and in combination with the model specifications of the target object, determining the action feedback information of the target object.

[0073] Specifically, the method for respectively determining the action sampling calculation current of the target object includes:

[0074] Respectively processing the three-phase data on the high-voltage side of the target object:

[0075]

[0076] In Equation 1, are respectively the calculation currents of phases A, B, and C on the high-voltage side of the target object participating in differential and braking, are respectively the sampling currents of phases A, B, and C on the high-voltage side of the target object;

[0077] Respectively processing the real-time current data on the low-voltage side of the target object:

[0078]

[0079] In Equation 2, are respectively the sampling currents of phases T1 and F1 on the low-voltage side of the target object, are respectively the sampling currents of phases T2 and F2 on the low-voltage side of the target object, is the calculation current of phases T1 and F1 on the low-voltage side of the target object participating in differential and braking, is the calculation current of phases T2 and F2 on the low-voltage side of the target object participating in differential and braking;

[0080] In this embodiment, for the convenience of formulating the corresponding action sampling calculation current balance adjustment information according to the model specifications of the target object, specifically, the method for determining the action sampling calculation current balance adjustment information of the target object includes:

[0081] Taking the current on the high-voltage side of the target object as a reference, performing balance adjustment on the current on the low-voltage side of the target object, specifically:

[0082]

[0083] In Equations 3 to 5, k is the turns ratio of the transformer winding of the target object, K pha is the balance coefficient of phase a of the transformer of the target object, K phb is the balance coefficient of phase b of the transformer of the target object, U E is the rated line voltage of the high-voltage side bus of the target object, U e is the rated voltage of the low-voltage side bus of the target object, n H is the transformation ratio of the current transformer on the high-voltage side, n La is the transformation ratio of the current transformer of phase a on the low-voltage side, n Lb is the transformation ratio of the current transformer of phase b on the low-voltage side. That is, different action sampling calculation current balance adjustment information can be formulated according to the different components configured for the target object.

[0084] At this time, the method for determining the action sampling output current of the target object includes:

[0085] The differential current calculation formula of the target object is:

[0086]

[0087] The braking current calculation formula of the target object is:

[0088]

[0089] In Equations 6 and 7, is the differential current of phase A of the target object, is the braking current of phase A of the target object; is the differential current of phase B of the target object, is the braking current of phase B; is the differential current of phase C of the target object, is the braking current of phase C;

[0090] According to Equations 6 and 7, the action sampling output current of the target object is determined respectively.

[0091] Referring to Figure 3 and Figure 4 , in this embodiment, for the convenience of understanding how to formulate the ratio differential characteristic diagram of the target object, the following description is given here. The method for formulating the ratio differential characteristic diagram of the target object includes: different values of the action sampling output current can be preset in advance, at least two different action feedback information of the target object are determined, and in combination with the ratio differential basic information of the target object, the braking interval and the differential interval of the target object are determined; that is, according to the different actions performed by the protection device of the target object, the braking interval and the differential interval of the target object can be determined respectively (such as Figure 3As shown. Then, according to the braking range and differential range of the target object, and combining the measured action information of multiple different target objects, the operating range of the ratio differential characteristic of the target object can be determined; that is, according to the determined braking range and differential range of the target object, the corresponding critical state of operation is determined. Then, according to the basic diagram of the ratio differential characteristic of the target object, and combining the braking range and differential range of the target object, as well as the operating range of the ratio differential characteristic of the target object, the action distribution of the target object can be determined; finally, according to the different action performances of the target object, the braking range, differential range, and the critical curve between braking and differential of the target object are determined, that is, finally, according to the action distribution of the target object, and combining the basic diagram of the ratio differential characteristic of the target object, the ratio differential characteristic diagram of the target object can be determined.

[0092] In this embodiment, the method for determining the braking range and differential range of the target object includes:

[0093] According to the model specification of the target object and the working information of the target object, the ratio differential protection operating equation of the target object can be determined:

[0094]

[0095] In Equation 8, I CDN is any one of the differential currents of the three phases of the target object, I ZDN is any one of the braking currents of the three phases of the target object, I CD>N is the setting value of the ratio differential starting current of any one of the three phases of the target object, I A1 , I A2 are the setting values of the first-stage and second-stage braking currents of any one of the three phases respectively, K res1 , K res2 are the two-stage ratio coefficients; according to Equation 8, the braking range and differential range of the target object are determined respectively. That is, here, according to the ratio differential protection operating equation of the target object, the differential starting range and braking starting range of the target object can be determined respectively. Then, finally, according to the differential starting range and braking starting range of the target object, the critical range of the target object between braking and differential can be determined. Specifically, the method for determining the action distribution of the target object includes: according to the braking range and differential range of the target object, the braking current range of the target object can be determined; then, according to the braking current range of the target object, and combining the measured action information of the target object, at least two differential action change situations of the target object can be determined; then, according to the differential action change situations of the target object, the bisection method is used to determine the action boundary curve of the target object; according to the action boundary curve of the target object, the operating range of the ratio differential characteristic is determined.

[0096] Refer to Figure 3 and Figure 4, here, for the convenience of understanding how to determine the critical range of the target object between braking and differential according to the differential starting range and braking starting range of the target object, the following description is given. Specifically, the method for determining the ratio differential characteristic action range includes: the search range of the target object can be determined according to the braking range and differential range of the target object; then, according to the search range of the target object and combined with the ratio differential basic information of the target object, the search braking starting value of the target object is determined, and the action sampling output current of the search braking starting value is determined; finally, the action sampling output current of the search braking starting value of the target object can be sent to the target object, and then, finally, according to the action measured information of the target object, the above steps are repeated by the dichotomy method until the action measured information of the target object meets the differential action critical value, and the action boundary curve of the target object is determined.

[0097] Refer to Figure 3 , here, for the convenience of understanding how to determine the action boundary curve of the target object by the dichotomy method, the following example is given. Specifically, the generation method further includes:

[0098] According to the braking range and differential range of the target object, a coordinate graph is made, where the vertical coordinate is the differential current and the horizontal coordinate is the braking current. At this time, according to the previously determined horizontal coordinate braking current value, the theoretical differential action value I can be calculated using Equation 6 and Equation 7 CD , and then determine that the maximum value of the vertical coordinate search range is I CD>> , the search minimum value is 0, and the search action value is I D . For the error control of the action value, the differential action error accuracy of the protection device of the target object can be preset to ±5%, and the test error accuracy value can be controlled. The error accuracy control algorithm is (I D - I CD ) / I CD × 100%, and the accuracy error is controlled within the range of ±5% (this standard setting can be improved), that is, it is judged whether the differential current test point is the final qualified point of the action boundary; it should be noted that in this embodiment, different action critical test current test points of the target object can be derived by reverse deduction using Equation 6 and Equation 7, that is:

[0099] The calculation formula for the differential current for testing the target object is:

[0100] I CDn = I m - K ph I n Equation 9;

[0101] The calculation formula for the braking current for testing the target object is:

[0102]

[0103] In Formulas 9 to 10, where I CDn is the calculated differential current of the target object, I ZDn is the calculated braking current of the target object, I m is the high-voltage side test output current of the target object, I n is the low-voltage side test output current of the target object, K ph is the low-voltage side balance coefficient of the target object. At this time, the high-voltage side test current calculation formula and the low-voltage side test current calculation formula of the target object can also be derived through the transformation of the differential braking current calculation formula for testing:

[0104] High-voltage side test current calculation formula of the target object:

[0105] I m =(I CDn +2I ZDn ) / 2 Formula 11;

[0106] Low-voltage side test current calculation formula of the target object:

[0107] I n =(2I ZDn -I CDn ) / 2K ph Formula 12;

[0108] Then, different action critical test current test points of the target object can be determined through Formulas 9 to 12 to facilitate subsequent determination of the action boundary curve of the target object using the bisection method.

[0109] Specifically, the method of using the bisection method to determine the action boundary curve of the target object includes:

[0110] The first step: Set the search value I D1 as the first search value, where the search value I D1 is compared with the theoretical differential action value I CD . If I D1 >I CD , then the second search value I D2 is used for search value taking, where: If I D1 <I CD , then the second search value I D2 is taken as: At the same time, calculate whether the action error accuracy of the search value is within the required range (calculated when the protection device operates reliably), and whether the protection device operates reliably. When the search value meets both requirements, it is determined as the boundary point of the final test, otherwise, enter the next search;

[0111] Step 2: Here, taking the expression I D1 >I CD as an example, the second search value is taken as the second search value I D2 and compared with the theoretical differential operating value I CD . If I D2 >I CD , then the third search value I D3 is continued to be used, where I D3 is taken as If I D2 <I CD , then the third search value I D3 is taken as At the same time, calculate whether the action error accuracy of the second search value I D2 is within the required range (which can be calculated when the protection device operates reliably). When the second search value I D2 meets both requirements simultaneously, it is determined as the boundary point of the final test; otherwise, proceed to the next search;

[0112] Step 3: Here, taking the expression I D2 <I CD as an example, if I D2 <I CD , then the third search value I D3 is continued to be used, where I D3 is taken as At the same time, calculate whether the action error accuracy of the third search value I D3 is within the required range (which can be calculated when the protection device operates reliably), and observe whether the protection device operates. If not, proceed to the next search value. When the third search value I D3 is always less than I CD , then continue to the next search value I D4 is taken as

[0113] Step 4: According to the next search value I D4 take to calculate whether the action error accuracy of the search value is within the required range (calculated when the protection device operates reliably), and observe whether the protection device of the target object operates; ......

[0115] Step n: Continuously determine the search value I Dn through the bisection method, where the search value continuously approaches the boundary point between the operating area and the braking area until it gradually approaches the theoretical differential operating value I CD, while meeting the two conditions of reliable operation of the protection device and within the accuracy error range, it can be determined that the differential current test point is the final qualified point.

[0116] Then perform multiple subsequent test points, and test each test point one by one according to the above process of the dichotomy method. Until all tests are completed, then connect all the test points to form a curve graph and compare it with the theoretical curve graph, and clearly and intuitively judge the distribution of each action area of the target object. Then finally clearly determine the action performance distribution of the target object.

[0117] In addition, for the determination of the critical search range value of the target object, a ratio differential characteristic curve graph can also be used. Then, according to the previously determined braking current value on the abscissa, calculate the theoretical differential action value, and then determine the interval for searching the maximum and minimum values according to ±20% (the value can be adjusted) of the theoretical differential action value. Then search for the action boundary test points according to the above dichotomy method to complete the test of the ratio differential characteristic curve.

[0118] Refer to Figure 3 , in this embodiment, in order to clearly and intuitively determine whether each test of the target object meets the reliable operation of the protection device and within the accuracy error range, the action boundary curve of the target object can be displayed in intervals in the form of a broken line graph. In this embodiment, in order to facilitate the understanding of the method for formulating the action boundary curve of the target object, the above figure shows that according to Equations 6 and 7, I CDN , I ZDN are calculated, and then according to Equation 8, it is judged whether point A is within the action area, that is, whether the ordinate I ZDN corresponding to the abscissa I CDN is greater than or equal to the height of AB plus I CD>N . The height of AB is equal to the slope of the oblique line AC of triangle ABC multiplied by the length of BC, that is, K res1 (I ZDN -I A1 ), and the length of BC is I ZDN -I A1 . It should be noted that the I CDN , I ZDN values corresponding to the three coordinates of point A, point B, and point C can be obtained respectively.

[0119] In a second aspect, the present invention also provides a ratio differential characteristic generation system for a high-speed rail catenary traction transformer, which adopts a ratio differential characteristic generation method for a high-speed rail catenary traction transformer as described in any one of the first aspects. The generation system further includes: a sampling module, an action feedback module, and a graph generation module. The sampling module is used to collect high-voltage side and low-voltage side currents in advance according to the performance of the target object, so as to determine the ratio differential basic information of the target object; the action feedback module is used to obtain the action feedback information of the target object; the graph generation module is used to formulate the ratio differential characteristic graph of the target object according to the ratio differential characteristic action interval information of the target object and in combination with the ratio differential characteristic basic graph of the target object. Preferably, the action feedback module may be a transformer protection device.

[0120] In some embodiments, the generation system can communicate using any currently known or future-developed network protocol such as HTTP (Hyper Text Transfer Protocol), and can be interconnected with digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include local area networks ("LAN"), wide area networks ("WAN"), the Internet (e.g., the Internet), and end-to-end networks (e.g., ad hoc end-to-end networks), as well as any currently known or future-developed networks.

[0121] The functions described above herein can be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that can be used include: Field Programmable Gate Arrays (FPGA), Application Specific Integrated Circuits (ASIC), Application Specific Standard Products (ASSP), Systems on Chip (SOC), Complex Programmable Logic Devices (CPLD), etc.

[0122] In a third aspect of the present invention, there is provided a computer-readable medium having a computer program stored thereon, wherein when the program is executed by a processor, it implements a method for generating the ratio differential characteristic of a high-speed railway traction transformer as described in any one of the first aspects. The computer-readable medium in this embodiment can be written in one or more programming languages or combinations thereof to write computer program code for performing the operations of some embodiments of the present disclosure. The above programming languages include object-oriented programming languages - such as Java, Smalltalk, C++, and also include conventional procedural programming languages - such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network - including a local area network (LAN) or a wide area network (WAN) - or can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0123] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the block may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0124] Specifically, according to some embodiments of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, some embodiments of the present disclosure include a computer program product that includes a computer program carried on a computer-readable medium, and the computer program contains program code for performing the method shown in the flowchart.

[0125] A fourth aspect of the present invention provides an electronic device, including: one or more processors; a storage device on which one or more programs are stored; when the one or more programs are executed by the one or more processors, the one or more processors implement a method for generating the ratio differential characteristic of a high-speed railway catenary traction transformer as described in the first aspect. Among them, the above computer-readable medium may be included in the above electronic device; it may also exist separately, that is, not assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device can implement a method for generating the ratio differential characteristic of a high-speed railway catenary traction transformer as described in the first aspect.

[0126] A fifth aspect of the present invention provides a computer program product, including a computer program, and the computer program implements a method for generating the ratio differential characteristic of a high-speed railway catenary traction transformer as described in the first aspect when executed by a processor.

[0127] The above description is only some preferred embodiments of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A method for generating ratio differential characteristics of a high-speed railway traction transformer, characterized in that: include: Obtain the model specification of the target object, and determine the ratio differential basic information of the target object in combination with the working information of the target object; According to the ratio differential basic information of the target object, a ratio differential characteristic basic diagram of the target object is prepared; Determine the action interval test information of the target object according to the ratio differential characteristic basic diagram of the target object; Transmitting the action interval test information of the target object to the target object to obtain the action feedback information of the target object; Determining the ratio differential characteristic action interval information of the target object according to the action feedback information of the target object; A ratio differential characteristic diagram of the target object is formulated according to the ratio differential characteristic action interval information of the target object and in combination with a ratio differential characteristic basic diagram of the target object.

2. The method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 1, characterized in that: The method for obtaining action feedback information of a target object comprises: According to the model and specification of the target object, the action sampling calculation current of the target object is determined respectively; According to the model specification of the target object and in combination with the action sampling and calculation current of the target object, the action sampling and calculation current balance adjustment information of the target object is determined; According to the current balance adjustment information of the target object, the action sampled calculated current of the target object is processed respectively to determine the action sampled output current of the target object; The motion sampling output current of the target object is transmitted to the target object to determine the motion measured information of the target object; The action feedback information of the target object is determined based on the measured action information of the target object and combined with the model specifications of the target object.

3. The method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 2, characterized in that: The method for respectively determining the action sampling and calculating current of the target object comprises: Process the three-phase data of the high-voltage side of the target object separately: In formula 1, They are the calculated currents of the three phases A, B, and C on the high voltage side of the target object participating in differential and braking. They are the three-phase sampling currents of A, B, and C on the high-voltage side of the target object; Process the real-time current data of the low-voltage side of the target object respectively: In formula 2, They are the T1 phase and F1 phase sampling currents of the low voltage side of the target object respectively. They are the T2 phase and F2 phase sampling currents of the low voltage side of the target object respectively. The calculated current of the low-voltage side T1 phase and F1 phase participating in differential and braking of the target object, The calculated current of the low-voltage side T2 phase and F2 phase participating in differential and braking of the target object.

4. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 3, characterized in that: The method for determining the action sampling of the target object and calculating the current balance adjustment information comprises: Based on the high-voltage side current of the target object, the low-voltage side current of the target object is balanced and adjusted, specifically: In equations 3 to 5, k is the transformer winding turns ratio of the target object, K pha is the transformer a-phase balance coefficient of the target object, K phb is the transformer b-phase balance coefficient of the target object, U E is the rated line voltage of the high-voltage busbar on the target object, U e is the rated voltage of the low-voltage busbar of the target object, n H is the high pressure side flow interconversion ratio, n La is the phase flow interconversion ratio of the low-pressure side a, n Lb is the transformation ratio of phase b flow on the low-pressure side.

5. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 4, characterized in that: The method for determining the action sampling output current of the target object comprises: The differential current calculation formula of the target object is: The calculation formula of the braking current of the target object is: In equations 6 and 7, is the A-phase differential current of the target object, The A-phase braking current of the target object; is the B-phase differential current of the target object, is the braking current of phase B; is the C-phase differential current of the target object, is the braking current of phase C; According to equations 6 and 7, the action sampling output current of the target object is determined respectively.

6. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 5, characterized in that: The method for formulating a ratio differential characteristic diagram of a target object comprises: Determine a braking interval and a differential interval of the target object according to motion feedback information of at least two different target objects and in combination with ratio differential basic information of the target object; Determine the ratio differential characteristic action interval of the target object according to the braking interval and the differential interval of the target object and in combination with the action measured information of a plurality of different target objects; Determine the motion distribution of the target object according to the ratio differential characteristic basic diagram of the target object and in combination with the braking interval and the differential interval of the target object and the ratio differential characteristic motion interval of the target object; According to the motion distribution of the target object and in combination with the ratio differential characteristic basic diagram of the target object, a ratio differential characteristic diagram of the target object is determined.

7. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 6, characterized in that: The method for determining the braking interval and the differential interval of the target object includes: According to the model specifications of the target object and the working information of the target object, determine the ratio differential protection action equation of the target object: In formula 8, I CDN is the differential current of any phase among the three phases of the target object, I ZDN is the braking current of any phase among the three phases of the target object, I CD>N is the phase ratio differential starting current setting value of any one of the three phases of the target object, I A1 ,I A2 They are the first and second stage braking current setting values ​​of any phase in the three-phase, K res1 , K res2 is the ratio coefficient of the two sections; According to Formula 8, the braking section and differential section of the target object are determined respectively.

8. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 7, characterized in that: The method for determining the motion distribution of the target object comprises: Determine a braking current interval of the target object according to a braking interval and a differential interval of the target object; Determine at least two differential action change conditions of the target object according to the braking current interval of the target object and in combination with the action measured information of the target object; According to the change of differential action of the target object, the action boundary curve of the target object is determined by using the dichotomy method; According to the action boundary curve of the target object, the ratio differential characteristic action range is determined.

9. A method for generating ratio differential characteristics of a high-speed railway traction transformer according to claim 8, characterized in that: The method for determining the ratio differential characteristic action interval includes: Determine the search interval range of the target object according to the braking interval and the differential interval of the target object; According to the search interval range of the target object and in combination with the ratio differential basic information of the target object, a search braking start value of the target object is determined, and an action sampling output current of the search braking start value is determined; The action sampling output current of the search braking start value of the target object is transmitted to the target object to determine the action measured information of the target object; The above steps are repeated using the binary method until the measured motion information of the target object meets the differential motion criticality, and the motion boundary curve of the target object is determined.

10. A high-speed railway traction transformer ratio differential characteristic generation system, characterized in that: A method for generating a ratio differential characteristic of a high-speed railway traction transformer according to any one of claims 1 to 9 is adopted, and the generating system further comprises: A sampling module, the sampling module is used to determine the ratio differential basic information of the target object; An action feedback module, the action feedback module is used to obtain action feedback information of the target object; A graph generation module is used to formulate a ratio differential characteristic graph of the target object according to the ratio differential characteristic action interval information of the target object and in combination with a ratio differential characteristic basic graph of the target object.

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