CN117638804A - Differential protection method and system for primary side overcurrent faults of train traction transformer - Google Patents
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Abstract
The invention provides a differential protection method and a differential protection system for primary side overcurrent faults of a train traction transformer, which relate to the technical field of train power supply protection and are used for carrying out fault mechanism analysis on the primary side overcurrent faults of the train traction transformer and classifying the primary side overcurrent faults caused by different fault sources; based on the fault classification result, a corresponding differential fault protection strategy is formulated, and an association function of a fault source and the differential fault protection strategy is constructed offline; collecting the current state of the primary overcurrent fault to be detected in real time by using a fault diagnosis board card, tracing the fault reason of the primary overcurrent fault to be detected to obtain a fault source, calling a correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected caused by the fault source to a control board card; the control board card reads the differential protection strategy corresponding to the primary side overcurrent fault to be detected, and executes the protection action corresponding to the differential protection strategy. The invention improves the intelligent level of fault protection and ensures the high-efficiency operation of the train.
Description
Technical Field
The invention relates to the technical field of power supply protection of trains, in particular to a differential protection method and system for primary side overcurrent faults of a train traction transformer.
Background
The primary side overcurrent fault of the traction transmission system of the high-speed train is a fault with great influence on the running working condition of the train, the primary side current of the traction transformer of the train exceeds a set protection threshold value, the normal working state of the train can be influenced, and the primary side circuit elements are damaged, so that the research on how to protect the primary side overcurrent fault of the traction transformer of the train has important significance.
In the protection scheme of the primary overcurrent fault of the traction transformer, once the primary overcurrent fault of the traction transformer occurs in a high-speed train, a train control system trips a main circuit breaker of a traction transmission system in a short time, so that the train loses power and runs at idle speed, and after the train stops, the train crew performs component inspection and maintenance one by one. According to the investigation of the field data, the primary overcurrent faults of the traction transformer of the train comprise four possible fault sources, namely: the fault of the transformer, the fault of the rectifier, poor contact of the bow net and excitation surge current, the severity of each fault source is greatly different, however, when the control system of the train encounters the primary side overcurrent fault of the traction transformer, the protection measure with the strongest conservation is directly adopted, namely the fault source which causes the primary side overcurrent fault is the most serious fault source by default, the tripping and stopping protection action is executed in a short time, and after stopping, the maintenance is checked by a crew member.
At present, differential protection researches on primary side overcurrent faults of a train traction transformer are few, on one hand, the primary side overcurrent faults of the traction transformer are faults of a system level, the fault reasons relate to the coupling of multiple components, and the real-time tracing of the faults has certain difficulty; on the other hand, various fault sources causing the primary side overcurrent faults of the traction transformer of the train are not accurately identified, and as disclosed in the prior patent document, the overcurrent protection method of the traction transformer comprises the following steps: detecting and controlling the state of a main breaker connected to a power supply of a target traction transformer in real time, collecting a primary side current signal of the target traction transformer when the main breaker is detected to be in a closing state, pre-judging the overcurrent state of the target traction transformer according to the value of the collected primary side current signal, judging the type of the overcurrent state according to the similarity between the front half period and the rear half period in one current period of the primary side current signal if the overcurrent state is pre-judged, and not triggering overcurrent protection action if the excitation inrush current state is judged to be generated; if the fault overcurrent state is judged, the main circuit breaker is opened, and overcurrent protection is carried out, but the fault properties of the primary overcurrent faults of the traction transformer caused by different fault sources are not classified, and differential protection cannot be formulated according to the different fault properties; the two reasons enable the protection of the primary side overcurrent fault of the traction transformer of the train in engineering to be unable to further improve the intelligent level, and the running efficiency of the train is directly affected.
Disclosure of Invention
The invention provides a differential protection method and a differential protection system for primary side overcurrent faults of a train traction transformer, which are used for solving the problem that the running efficiency of a train is low due to limited intelligent level of fault protection in the conventional primary side overcurrent fault protection method of the train traction transformer.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a differential protection method for primary side overcurrent faults of a train traction transformer comprises the following steps:
s1, analyzing a fault mechanism of a primary side overcurrent fault of a train traction transformer, and classifying the primary side overcurrent faults caused by different fault sources to obtain a fault classification result;
s2, based on the fault classification result, a corresponding differential fault protection strategy is formulated, and an association function of the fault source and the differential fault protection strategy is constructed offline;
s3, collecting the current state of the primary overcurrent fault to be detected in real time by using a fault diagnosis board card, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to a control board card;
s4, the control board reads the differential protection strategy corresponding to the primary side overcurrent fault to be detected, and executes the protection action corresponding to the differential protection strategy.
According to the technical scheme, first, failure mechanism analysis is carried out on primary side overcurrent faults of a train traction transformer, primary side overcurrent faults caused by different fault sources are classified, then corresponding differential fault protection strategies are formulated based on different fault classification results, an association function of the fault sources and the differential fault protection strategies is built in an off-line mode, then a fault diagnosis board card is utilized to collect current states of the primary side overcurrent faults to be detected in real time, when the primary side overcurrent faults occur, fault reasons of the primary side overcurrent faults to be detected are traced to obtain the fault sources, the association function is called, the differential protection strategies corresponding to the primary side overcurrent faults to be detected caused by the fault sources are output to a control board card, and protection actions corresponding to the differential protection strategies are read and executed by the control board card.
Preferably, the analyzing the fault mechanism of the primary side overcurrent fault of the train traction transformer classifies the primary side overcurrent faults caused by different fault sources to obtain a fault classification result, and specifically includes:
s11, respectively carrying out equivalent circuit modeling on primary side overcurrent faults caused by different fault sources to obtain an equivalent circuit;
s12, judging whether the primary side overcurrent faults caused by different fault sources can be eliminated by themselves based on the equivalent circuit in the S11, if so, classifying the primary side overcurrent faults which are automatically restored to the normal running state without external means as temporary primary side overcurrent faults; if not, classifying the primary overcurrent fault which cannot be recovered by itself after the primary overcurrent fault occurs as a permanent primary overcurrent fault;
s13, recording the temporary primary side overcurrent and the permanent primary side overcurrent as the fault classification result.
Preferably, the modeling of the equivalent circuit for the primary side overcurrent faults caused by different fault sources includes:
s111, the power supply network of the train traction transmission system is equivalent to a constant voltage source, T-shaped equivalent is carried out on a train traction transformer in the train traction transmission system, and the train traction transformer is equivalent to a T-shaped circuit;
s112, connecting the constant voltage source to the T-shaped circuit to obtain an equivalent circuit.
Preferably, based on the fault classification result, a corresponding differential fault protection policy is formulated, and an association function of the fault source and the differential fault protection policy is constructed offline, which specifically includes:
s21, respectively formulating a first protection strategy of the temporary primary-side overcurrent fault and a second protection strategy of the permanent primary-side overcurrent fault based on fault classification results comprising the temporary primary-side overcurrent fault and the permanent primary-side overcurrent fault;
s22, based on the fault source, offline converting the first protection strategy and the second protection strategy into association functions corresponding to the fault source
Preferably, the first protection strategy is to disconnect a main breaker of a train traction transmission system after the primary overcurrent fault occurs, isolate train power and stop and overhaul the train.
Preferably, the second protection strategy is to perform a reclosing operation on a main breaker of the train traction transmission system after the primary overcurrent fault occurs, and the train is put into operation again.
Preferably, the fault diagnosis board card comprises a detection module, a tracing module and a strategy making module
The detection module is used for collecting the current state of the primary side overcurrent fault to be detected in real time;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the association function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source, to the control board card.
Preferably, the fault sources include transformer faults, rectifier faults, bow net poor contact and magnetizing inrush current.
The invention also provides a differential protection system for the primary side overcurrent fault of the train traction transformer, which comprises the following components:
the fault classification module is used for carrying out fault mechanism analysis on the primary side overcurrent faults of the train traction transformer, classifying the primary side overcurrent faults caused by different fault sources and obtaining a fault classification result;
the association function construction module is used for formulating a corresponding differential fault protection strategy according to the fault classification result and constructing an association function of the fault source and the differential fault protection strategy in an off-line mode;
the fault diagnosis board card is used for collecting the current state of the primary overcurrent fault to be detected in real time, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to the control board card;
and the control board card is used for reading the differential protection strategy corresponding to the primary side overcurrent fault to be detected and executing the protection action corresponding to the differential protection strategy.
Preferably, the fault diagnosis board card comprises a detection module, a tracing module and a strategy making module
The detection module is used for collecting the current state of the primary side overcurrent fault to be detected in real time;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the correlation function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a differential protection method and a system for primary side overcurrent faults of a train traction transformer, which are characterized in that firstly, fault mechanism analysis is carried out on the primary side overcurrent faults of the train traction transformer, the primary side overcurrent faults caused by different fault sources are classified, then, corresponding differential fault protection strategies are formulated based on different fault classification results, an association function of the fault sources and the differential fault protection strategies is constructed offline, then, a fault diagnosis board card is utilized to collect the current state of the primary side overcurrent faults to be detected in real time, when the primary side overcurrent faults occur, the fault cause of the primary side overcurrent faults to be detected is traced, the fault source is obtained, the association function is called, the differential protection strategy corresponding to the primary side overcurrent faults to be detected caused by the fault source is output to a control board card, and the control board card reads and executes the protection action corresponding to the differential protection strategy.
Drawings
Fig. 1 shows a flow diagram of a differential protection method for primary side overcurrent faults of a train traction transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a differential protection method for primary side overcurrent faults of a traction transformer of a train according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a differential protection system for primary side overcurrent faults of a traction transformer of a train according to an embodiment of the present invention.
310. A fault classification module; 320. the association function construction module; 330. a fault diagnosis board; 340. and (5) controlling the board card.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for better illustrating the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions, and the description of the directions of the parts such as "up" and "down" is not limiting of the present patent;
it will be appreciated by those skilled in the art that some well known descriptions in the figures may be omitted;
the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;
the technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, this embodiment provides a differential protection method for primary side overcurrent faults of a train traction transformer, which includes the following steps:
s1, analyzing a fault mechanism of a primary side overcurrent fault of a train traction transformer, and classifying the primary side overcurrent faults caused by different fault sources to obtain a fault classification result;
in step S1, the fault sources are set to 4 types, including transformer faults, rectifier faults, bad contact of a bow net and excitation surge current, fault mechanism analysis is performed on primary side overcurrent faults of a train traction transformer, and the primary side overcurrent faults caused by the 4 fault sources are classified to obtain fault classification results including temporary primary side overcurrent faults and permanent primary side overcurrent faults, which specifically include:
s11, respectively carrying out equivalent circuit modeling on primary side overcurrent faults caused by different fault sources to obtain an equivalent circuit;
s12, judging whether the primary side overcurrent faults caused by different fault sources can be eliminated by themselves based on the equivalent circuit in the S11, if so, classifying the primary side overcurrent faults which are automatically restored to the normal running state without external means as temporary primary side overcurrent faults; if not, classifying the primary overcurrent fault which cannot be recovered by itself after the primary overcurrent fault occurs as a permanent primary overcurrent fault;
s13, recording the temporary primary side overcurrent and the permanent primary side overcurrent as the fault classification result.
S2, based on the fault classification result, a corresponding differential fault protection strategy is formulated, and an association function of the fault source and the differential fault protection strategy is constructed offline;
in step S2, based on two kinds of fault classification results, a corresponding differential fault protection policy is formulated, and an association function between the fault source and the differential fault protection policy is built offline, which specifically includes:
s21, respectively formulating a first protection strategy of the temporary primary-side overcurrent fault and a second protection strategy of the permanent primary-side overcurrent fault based on fault classification results comprising the temporary primary-side overcurrent fault and the permanent primary-side overcurrent fault;
in step S21, the first protection strategy is to disconnect the main breaker of the train traction transmission system after the primary side overcurrent fault occurs, isolate the train power, and stop and overhaul the train; and the second protection strategy is to perform one reclosing operation on a main breaker of a train traction transmission system after the primary overcurrent fault occurs, and the train is put into operation again.
S22, based on the fault source, offline converting the first protection strategy and the second protection strategy into associated functions corresponding to the fault source;
in step S22, a class of faults corresponds to a class of differential fault protection strategies, and the class of faults and the differential fault protection strategies are corresponding to each other in a mathematical form, for example, permanent primary side overcurrent faults (01) correspond to a first protection strategy (a); the temporary primary overcurrent fault (02) corresponds to a second protection strategy (B), namely that an association function corresponding to the fault source exists: a=f (1) b=f (2) to facilitate the next embedded execution;
s3, collecting the current state of the primary overcurrent fault to be detected in real time by using a fault diagnosis board card, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to a control board card;
in step S3, the fault diagnosis board card includes a detection module, a tracing module, and a policy making module, where the detection module is configured to collect, in real time, a current state of a primary side overcurrent fault to be detected;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the association function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source, to the control board card.
S4, the control board reads the differential protection strategy corresponding to the primary side overcurrent fault to be detected, and executes the protection action corresponding to the differential protection strategy.
In this embodiment, referring to fig. 2, first, a fault mechanism analysis is performed on a primary side overcurrent fault of a traction transformer of a train, primary side overcurrent faults caused by different fault sources are classified, then corresponding differential fault protection strategies are formulated based on different fault classification results, an association function of the fault sources and the differential fault protection strategies is constructed offline, then a fault diagnosis board card is utilized to collect current states of the primary side overcurrent faults to be detected in real time, when the primary side overcurrent faults occur, the fault causes of the primary side overcurrent faults to be detected are traced to obtain the fault sources, the association function is called, the differential protection strategy corresponding to the primary side overcurrent faults to be detected caused by the fault sources is output to a control board card, and protection actions corresponding to the differential protection strategies are read and executed by the control board card.
Example 2
Referring to fig. 1, the modeling of the equivalent circuit in step S11 includes the steps of:
s111, the power supply network of the train traction transmission system is equivalent to a constant voltage source, T-shaped equivalent is carried out on a train traction transformer in the train traction transmission system, and the train traction transformer is equivalent to a T-shaped circuit;
in step S111, the T-shaped circuit is composed of an inductive reactance of the primary side and a secondary side and an excitation branch, and the secondary side of the T-shaped circuit is an inductive load;
s112, connecting the constant voltage source to the T-shaped circuit to obtain an equivalent circuit.
In step S112, the constant voltage source is connected to the T-type circuit, so as to obtain an equivalent circuit for researching the primary side overcurrent fault of the train traction transformer, wherein the equivalent circuit comprises the constant voltage source and the T-type circuit;
step S12, determining whether the primary side overcurrent faults caused by the different fault sources can be eliminated by themselves, specifically includes:
s121: the four fault sources obtained in the step S1 are equivalent and substituted into the equivalent circuit, and the specific method is as follows: the transformer fault is equivalent to the short circuit of the primary side of the traction transformer, namely the primary side of a T-shaped circuit in an equivalent circuit; the rectifier fault is equivalent to the secondary side short circuit of the T-shaped circuit; the poor contact of the bow net and the excitation surge fault are equivalent to the decrease of the impedance of an excitation branch in a T-shaped circuit;
s122: in the equivalent circuit, when the short circuit of the primary side and the secondary side of the T-shaped circuit is not interfered by other external factors, the short circuit is in an irreversible state, and is represented by the closing of the primary side and secondary side switches K1/K2 of the T-shaped circuit, and the practical significance is breakdown of primary side/secondary side elements of the traction transformer; the arc net poor contact and the excitation surge fault are represented as the decline of the impedance of an excitation branch in an equivalent circuit, the actual significance is that the magnetic flux of a transformer core is saturated, the magnetic saturation degree of the traction transformer is gradually recovered to be normal after the traction transformer returns to a stable normal working state, and the impedance of the excitation branch in the equivalent circuit is gradually increased to a normal value;
s123: based on S122, transformer failure, rectifier failure is defined as permanent primary overcurrent, and bow net poor contact and magnetizing inrush current are defined as temporary primary overcurrent.
Example 3
Referring to fig. 3, this embodiment proposes a differential protection system for primary side overcurrent faults of a train traction transformer, including:
the fault classification module is used for carrying out fault mechanism analysis on the primary side overcurrent faults of the train traction transformer, classifying the primary side overcurrent faults caused by different fault sources and obtaining a fault classification result;
the association function construction module is used for formulating a corresponding differential fault protection strategy according to the fault classification result and constructing an association function of the fault source and the differential fault protection strategy in an off-line mode;
the fault diagnosis board card is used for collecting the current state of the primary overcurrent fault to be detected in real time, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to the control board card;
in the fault diagnosis board card, the fault diagnosis board card comprises a detection module, a tracing module and a strategy making module
The detection module is used for collecting the current state of the primary side overcurrent fault to be detected in real time;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the correlation function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source.
And the control board card is used for reading the differential protection strategy corresponding to the primary side overcurrent fault to be detected and executing the protection action corresponding to the differential protection strategy.
In the embodiment, first, fault mechanism analysis is carried out on primary side overcurrent faults of a train traction transformer, primary side overcurrent faults caused by different fault sources are classified, then corresponding differential fault protection strategies are formulated based on different fault classification results, an association function of the fault sources and the differential fault protection strategies is built in an off-line mode, then a fault diagnosis board card is utilized to collect current states of the primary side overcurrent faults to be detected in real time, when the primary side overcurrent faults occur, fault reasons of the primary side overcurrent faults to be detected are traced to obtain the fault sources, the association function is called, the differential protection strategies corresponding to the primary side overcurrent faults to be detected caused by the fault sources are output to a control board card, and protection actions corresponding to the differential protection strategies are read and executed by the control board card.
Claims (10)
1. The differential protection method for the primary side overcurrent faults of the train traction transformer is characterized by comprising the following steps of:
s1, analyzing a fault mechanism of a primary side overcurrent fault of a train traction transformer, and classifying the primary side overcurrent faults caused by different fault sources to obtain a fault classification result;
s2, based on the fault classification result, a corresponding differential fault protection strategy is formulated, and an association function of the fault source and the differential fault protection strategy is constructed offline;
s3, collecting the current state of the primary overcurrent fault to be detected in real time by using a fault diagnosis board card, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to a control board card;
s4, the control board reads the differential protection strategy corresponding to the primary side overcurrent fault to be detected, and executes the protection action corresponding to the differential protection strategy.
2. The differential protection method for primary side overcurrent faults of a train traction transformer according to claim 1, wherein the fault mechanism analysis is performed on the primary side overcurrent faults of the train traction transformer, the primary side overcurrent faults caused by different fault sources are classified, and a fault classification result is obtained, and the differential protection method specifically comprises the following steps:
s11, respectively carrying out equivalent circuit modeling on primary side overcurrent faults caused by different fault sources to obtain an equivalent circuit;
s12, judging whether the primary side overcurrent faults caused by different fault sources can be eliminated by themselves based on the equivalent circuit in the S11, if so, classifying the primary side overcurrent faults which are automatically restored to the normal running state without external means as temporary primary side overcurrent faults; if not, classifying the primary overcurrent fault which cannot be recovered by itself after the primary overcurrent fault occurs as a permanent primary overcurrent fault;
s13, recording the temporary primary side overcurrent and the permanent primary side overcurrent as the fault classification result.
3. The differential protection method for primary side overcurrent faults of the train traction transformer according to claim 2, wherein the modeling of equivalent circuits is performed on the primary side overcurrent faults caused by different fault sources respectively, specifically comprising:
s111, the power supply network of the train traction transmission system is equivalent to a constant voltage source, T-shaped equivalent is carried out on a train traction transformer in the train traction transmission system, and the train traction transformer is equivalent to a T-shaped circuit;
s112, connecting the constant voltage source to the T-shaped circuit to obtain an equivalent circuit.
4. The differential protection method for the primary side overcurrent fault of the train traction transformer according to claim 2, wherein a corresponding differential fault protection strategy is formulated based on the fault classification result, and an association function of the fault source and the differential fault protection strategy is constructed offline, specifically comprising:
s21, respectively formulating a first protection strategy of the temporary primary-side overcurrent fault and a second protection strategy of the permanent primary-side overcurrent fault based on fault classification results comprising the temporary primary-side overcurrent fault and the permanent primary-side overcurrent fault;
s22, based on the fault source, offline converting the first protection strategy and the second protection strategy into association functions corresponding to the fault source.
5. The differential protection method for primary side overcurrent faults of a train traction transformer of claim 4, wherein the first protection strategy is to disconnect a main breaker of a train traction transmission system after the primary side overcurrent faults occur, isolate train power and stop and overhaul the train.
6. The differential protection method for primary side overcurrent faults of a train traction transformer of claim 4, wherein the second protection strategy is to perform a reclosing operation on a main breaker of a train traction transmission system after the primary side overcurrent faults occur, and the train is put back into operation.
7. The differential protection method for primary side overcurrent faults of a train traction transformer according to claim 1, wherein the fault diagnosis board card comprises a detection module, a tracing module and a strategy making module
The detection module is used for collecting the current state of the primary side overcurrent fault to be detected in real time;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the association function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source, to the control board card.
8. The differential protection method for primary side overcurrent faults of a train traction transformer of claim 1, wherein the fault sources include transformer faults, rectifier faults, bow net contact failure and magnetizing inrush current.
9. A differential protection system for a primary side overcurrent fault of a train traction transformer, comprising:
the fault classification module is used for carrying out fault mechanism analysis on the primary side overcurrent faults of the train traction transformer, classifying the primary side overcurrent faults caused by different fault sources and obtaining a fault classification result;
the association function construction module is used for formulating a corresponding differential fault protection strategy according to the fault classification result and constructing an association function of the fault source and the differential fault protection strategy in an off-line mode;
the fault diagnosis board card is used for collecting the current state of the primary overcurrent fault to be detected in real time, tracing the fault reason of the primary overcurrent fault to be detected to obtain the fault source, calling the correlation function, and outputting a differential protection strategy corresponding to the primary overcurrent fault to be detected, which is caused by the fault source, to the control board card;
and the control board card is used for reading the differential protection strategy corresponding to the primary side overcurrent fault to be detected and executing the protection action corresponding to the differential protection strategy.
10. The differential protection system for primary side overcurrent faults of a train traction transformer of claim 9, wherein the fault diagnosis board card comprises a detection module, a tracing module and a strategy making module
The detection module is used for collecting the current state of the primary side overcurrent fault to be detected in real time;
the tracing module is used for tracing the fault reason of the primary side overcurrent fault to be detected after the primary side overcurrent fault to be detected of the train traction transformer is monitored in real time, so as to obtain the fault source;
the strategy making module is used for inputting the fault source obtained by the tracing module into the correlation function for processing, and outputting a differential protection strategy corresponding to the primary side overcurrent fault to be detected, which is caused by the fault source.
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