CN113933743B - On-line diagnosis device and method for short-circuit fault point of secondary winding of traction transformer - Google Patents
On-line diagnosis device and method for short-circuit fault point of secondary winding of traction transformer Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention relates to the field of rail transit equipment, in particular to a device and a method for online diagnosis of a short-circuit fault point of a secondary winding of a traction transformer. The invention relates to an online diagnosis device for a short-circuit fault point of a secondary winding of a traction transformer, which comprises an offline design module, a fault type detection module and a fault type analysis module, wherein the offline design module is used for establishing a working condition event time sequence characteristic mode set corresponding to the fault type based on system principle parameters and historical data and combined with the relevant control logic of a train traction system; and the online implementation module is used for acquiring sensor signals and traction system state signals related to the secondary short-circuit fault in real time, matching the sensor signals and the traction system state signals with the working condition event characteristic patterns in the time sequence characteristic pattern set, outputting corresponding fault types and executing corresponding isolation strategies. The device and the method for diagnosing the short-circuit fault point of the secondary winding of the traction transformer on line provided by the invention have the advantages that the precise positioning of the specific short-circuit fault point of the secondary winding of the traction transformer is realized, differential protection and isolation actions are executed based on the specific fault point, and the train availability is improved.
Description
Technical Field
The invention relates to the field of rail transit equipment, in particular to a device and a method for online diagnosis of a short-circuit fault point of a secondary winding of a traction transformer.
Background
In traction systems of electric locomotives and motor train units, a traction transformer is used for reducing nominal 25kV high-voltage electricity on a contact network into lower-grade alternating current capable of enabling a traction converter to normally work.
The traction system is generally provided with detection and protection devices such as a primary voltage transformer, a primary current transformer, cooling oil temperature, a pressure release valve, a Buch relay and the like to realize effective monitoring and protection of the abnormity of the traction transformer, but the devices cannot identify faults such as secondary side grounding, secondary side short circuit and the like of the traction transformer.
The secondary side grounding and the secondary side short-circuit fault of the traction transformer have large influence on a traction system, for example, if the secondary side grounding fault is expanded from single-point grounding to two-point grounding, a line short circuit is caused, and system abnormity is caused; if the short circuit of the secondary side is not monitored and found in time, the traction transformer is overheated and even a fire accident is caused.
Therefore, how to accurately diagnose the short-circuit fault of the secondary side of the transformer has very important significance for the protection and troubleshooting of electrical equipment.
Chinese patent CN201610803911.7 discloses a method for diagnosing a short circuit on a secondary side of a transformer, which determines whether a short circuit fault occurs on the secondary side of the transformer by counting whether the number of changing edges occurring in a primary side current of the transformer is greater than a preset threshold within a preset time after a main circuit breaker is closed.
The method is only suitable for static working conditions, secondary short circuit faults cannot be reported in normal operation, and specific fault points of the secondary short circuit cannot be located.
The chinese invention patent CN201810663327.5 discloses a real-time diagnosis method for short-circuit fault of vehicle-mounted transformer under high-voltage operation state. The method comprises a secondary side short-circuit fault diagnosis method, a primary side short-circuit fault diagnosis method and a turn-to-turn short-circuit fault diagnosis method.
The transformer secondary short circuit is considered in the patent, but a specific fault point of the secondary short circuit cannot be located, and the method is only suitable for operating in a four-quadrant operating condition and cannot be used for diagnosing the secondary short circuit fault in other operating conditions.
The Chinese invention patent CN201811007325.7 discloses a method and a device for diagnosing the short circuit of a secondary winding of a locomotive traction transformer, which reasonably set a primary side current threshold based on the power balance principle and improve the precision of diagnosing the short circuit fault of the secondary side. The method cannot realize the positioning of the specific fault point of the secondary short circuit.
Disclosure of Invention
The invention aims to provide an online diagnosis device for a short-circuit fault point of a secondary winding of a traction transformer, which solves the technical problem that the specific short-circuit fault point of the secondary winding of the traction transformer is difficult to accurately position in the prior art.
In order to achieve the purpose, the invention provides an online diagnosis device for a short-circuit fault point of a secondary winding of a traction transformer, which comprises an offline design module and an online implementation module, wherein the offline design module comprises:
the off-line design module is used for setting threshold parameters of a related event set of the secondary short-circuit fault based on system principle parameters and historical data to form working condition event sets under different working conditions, and establishing a working condition event time sequence characteristic mode set corresponding to the fault type by combining with related control logic of a train traction system;
the online implementation module is connected with the offline design module and comprises a fault detection unit and a fault decision unit,
the fault detection unit collects sensor signals related to the secondary short-circuit fault and traction system state signals in real time, compares working condition event sets of the off-line design module, judges whether the related events of the secondary short-circuit fault are established or not, sends event information and working condition information to the fault decision unit if the related events are established, and continues to monitor signals if the related events are not established;
and the fault decision unit is connected with the fault detection unit, is matched with the working condition event characteristic pattern in the time sequence characteristic pattern set in real time on the basis of the event information and the working condition information output by the fault detection unit, outputs a corresponding fault type if the matched pattern exists, executes a corresponding isolation strategy, and otherwise, updates the event and the working condition information and continues monitoring.
In an embodiment, if the fault detection unit determines that the event related to the secondary side short-circuit fault is established, the fault detection unit outputs a fault flag to perform a fault protection action.
In one embodiment, the fault detection unit performs real-time identification of the current working condition according to the traction system state information.
In an embodiment, the fault detection unit determines whether an event related to a secondary short-circuit fault exists based on a primary current value and a secondary current value acquired by a sensor.
In one embodiment, the set of operating condition events of the secondary side short circuit is related to sampling values of the primary side current transformer and the secondary side current sensor, and a change of the sampling value corresponds to a corresponding operating condition.
In an embodiment, the operating condition event timing characteristic pattern is a mapping relation between a fault type, an operating condition and a corresponding operating condition event or an associated adjacent operating condition event.
In one embodiment, the isolation policy comprises:
forbidding high voltage, and isolating the converter where the fault winding is located;
and allowing the main circuit to be switched on and switched off, disconnecting the charging of the converter corresponding to the fault winding and short-circuiting the contactor, and blocking the pulse of the shaft pulse rectifier.
In order to achieve the above object, the present invention provides an online diagnosis method for a short-circuit fault point of a secondary winding of a traction transformer, which comprises an offline design process and an online implementation process,
the off-line design process comprises the following steps:
setting threshold parameters of a related event set of the secondary side short circuit fault based on system principle parameters and historical data to form working condition event sets under different working conditions;
establishing a working condition event time sequence characteristic mode set corresponding to the fault type by combining the relevant control logic of the train traction system;
the online implementation process comprises a fault detection step and a fault decision step:
a fault detection step, namely acquiring a sensor signal related to a secondary short-circuit fault and a traction system state signal in real time, comparing a working condition event set of an offline design flow, judging whether the related event of the secondary short-circuit fault is established, if so, entering a fault decision step, and if not, continuing to monitor the signal;
and a fault decision step, namely matching the event information and the working condition information with the working condition event characteristic patterns in the time sequence characteristic pattern set in real time, if the matched patterns exist, outputting corresponding fault types, and executing a proper isolation strategy, otherwise, updating the event and the working condition information, and continuing to monitor.
In an embodiment, in the fault detection step, if it is determined that the event related to the secondary short-circuit fault is established, a fault flag is output, and a fault protection action is executed.
In one embodiment, the fault detection step is to identify the current working condition in real time according to the traction system state information.
In an embodiment, the fault detecting step determines whether an event related to the secondary short-circuit fault exists based on the primary current and the secondary current values acquired by the sensor.
In one embodiment, the set of operating condition events of the secondary side short circuit is related to sampling values of the primary side current transformer and the secondary side current sensor, and a change of the sampling value corresponds to a corresponding operating condition.
In an embodiment, the operating condition event timing characteristic pattern is a mapping relation between a fault type, an operating condition and a corresponding operating condition event or an associated adjacent operating condition event.
In one embodiment, the isolation policy comprises:
forbidding high voltage, and isolating the converter where the fault winding is located;
and allowing the main circuit to be switched on and switched off, disconnecting the charging of the converter corresponding to the fault winding and short-circuiting the contactor, and blocking the pulse of the shaft pulse rectifier.
The invention provides a device and a method for diagnosing a short-circuit fault point of a secondary winding of a traction transformer on line, which can realize accurate positioning of the specific short-circuit fault point of the secondary winding of the traction transformer, and aims to overcome the defects that the conventional fault diagnosis method for the short-circuit of the secondary winding of the traction transformer by a rail transit vehicle is primary, cannot realize accurate fault point positioning, has high false alarm and missing report rate, has single protection and isolation action and has excessive protection.
The device and the method for online diagnosing the short-circuit fault point of the secondary winding of the traction transformer have the following beneficial effects.
1) The online accurate positioning of the short-circuit fault point of the secondary winding of the traction transformer can be realized;
2) differential protection isolation actions can be executed based on specific fault points, and the train availability is improved;
3) the existing hardware does not need to be changed, and the engineering is simple to realize.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
FIG. 1 discloses a schematic block diagram of a main circuit of a typical AC-DC-AC train traction system;
FIG. 2 discloses a schematic diagram of the working condition transition during the operation of a train;
fig. 3 discloses a flow chart of a method for online diagnosing a short-circuit fault point of a secondary winding of a traction transformer according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through intervening agents, or may be internally connected to the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides an online diagnosis method and device for a short-circuit fault point of a secondary winding of a traction transformer, which can realize accurate positioning of the specific short-circuit fault point of the secondary winding of the traction transformer.
Fig. 1 is a schematic block diagram of a main circuit of a typical ac-dc-ac transmission locomotive and motor train unit traction system, and as shown in fig. 1, the main circuit of the locomotive and motor train unit traction system mainly comprises three parts, namely a traction transformer, a traction converter and a traction motor.
Single-phase AC 25kV alternating current of a power supply network flows into a vehicle body through a pantograph, a main circuit breaker VCB and a primary winding of a traction transformer, and alternating current is provided for a converter circuit by the secondary winding of the traction transformer.
The alternating current is converted into direct current under the action of the pulse rectifier, and after being filtered by the intermediate direct current link, the direct current is converted into three-phase alternating current with variable frequency and amplitude by the inverter to drive the traction motor, so that the locomotive is controlled to advance at different speeds and traction forces.
The traction converter comprises a charging loop, a pulse rectifier, an intermediate direct current link, an inverter and the like.
As shown in fig. 1, a primary voltage transformer TV and a primary current transformer TA are respectively used to collect primary voltage and current of a traction transformer, and LH 1-LHN are secondary current sensors of the traction transformer, used to measure the secondary winding current of each traction transformer, and used for controlling a pulse rectifier converter of a traction system.
Coil1 is the 1 st secondary winding of the traction transformer, KM11 and KM21 are a charging contactor and a short-circuit contactor of the converter corresponding to the 1 st secondary winding respectively, Rchr1 is the charging loop resistance of the converter corresponding to the 1 st secondary winding, and KM11, KM21 and Rchr1 form the 1 st charging loop.
The Converter1 is the 1 st pulse rectifier, the Inverter1 is the 1 st Inverter, the charging circuit, the rectifier and the Inverter constitute the traction Converter.
Traction Motor1 represents the 1 st Traction Motor.
CoilN is the nth secondary winding of the traction transformer, KM1N and KM2N are a charging contactor and a short-circuit contactor of the converter corresponding to the nth secondary winding respectively, RchrN is a charging loop resistor of the converter corresponding to the nth secondary winding, and KM1N, KM2N and RchrN constitute the nth charging loop.
ConverterN stands for the Nth pulse rectifier, and InverterN is the Nth inverter, the charging loop, the rectifier and the inverter form a traction converter.
The Traction MotorN represents the Nth Traction motor.
In fig. 1, there is a traction system in the form of a common intermediate circuit (e.g., HXD1 series) that has a connection line linking the positive and negative terminals of the different intermediate circuits, and there is no such connection line as a separate traction system for each axle electrical structure similar to the HXD3 series of vehicle models. The invention provides a method and a device for online diagnosing a short-circuit fault point of a secondary winding of a traction transformer, which are applicable to both traction systems.
There are four typical types of minor-side short-circuit faults, which are sequentially labeled as C1-C4, as shown in table 1.
TABLE 1 traction transformer secondary short-circuit type description
The working process of the main circuit of the traction system of the locomotive and the motor train unit is mainly divided into four working conditions shown in the table 2.
TABLE 2 running condition table of traction system
Fig. 2 discloses a schematic diagram of operating condition transition during train operation, and as shown in fig. 2, a locomotive start-up process or a fault restart process generally sequentially goes through operating conditions W1-W4 or several intermediate operating conditions, and will be maintained at operating condition W3 or operating condition W4 during steady-state operation.
When overvoltage or overcurrent faults occur, the locomotive is caused to break main circuit or block pulse and other protection actions, and at the moment, one working condition is converted into other working conditions.
The on-line diagnosis device for the short-circuit fault point of the secondary winding of the traction transformer can accurately diagnose the short-circuit faults of the secondary windings of the traction transformers in different types on line, and in the embodiment shown in the figures 1 and 2, the on-line accurate diagnosis can be performed on the short-circuit faults of the secondary windings of the traction transformers in four different types shown in the table 1.
The invention provides an online diagnosis device for a short-circuit fault point of a secondary winding of a traction transformer, which comprises an offline design module and an online implementation module, wherein the offline design module comprises:
the off-line design module is used for setting threshold parameters of a related event set of the secondary short-circuit fault based on system principle parameters and historical data, analyzing fault working condition events to form working condition event sets under different working conditions, analyzing a working condition event time sequence characteristic mode by combining with related control logic of a train traction system, and establishing a working condition event time sequence characteristic mode set corresponding to a fault type;
the online implementation module comprises a fault detection unit and a fault decision unit,
the fault detection unit collects sensor signals related to the secondary short-circuit fault and traction system state signals in real time, compares working condition event sets of the offline design module, judges whether the related events of the secondary short-circuit fault are established or not, if the related events are established, sends event information and working condition information to the fault decision unit, outputs a fault sign, executes fault protection action, and if the related events are not established, continues to monitor signals;
and the fault decision unit is connected with the fault detection unit, is matched with the working condition event characteristic patterns in the time sequence characteristic pattern set in real time based on the event information and the working condition information output by the fault detection unit, outputs a corresponding fault type if the matched patterns exist, executes a proper isolation strategy, and otherwise updates the event and the working condition information and continues monitoring.
According to the device and the method for online diagnosis of the short-circuit fault point of the secondary winding of the traction transformer, provided by the invention, fault modeling is carried out based on a series of working condition change rules of a system after a fault occurs through a working condition event time sequence characteristic mode, so that real-time diagnosis of the fault is realized.
Firstly, analyzing the relevant working condition event of the short-circuit fault of the secondary winding.
For a complex system (such as a train traction system), a plurality of operation conditions often exist in the complex system, and the system behaviors and corresponding fault modes of different operation conditions are different.
When the system fails, complex conversion among a plurality of working conditions often exists inside the system due to the control and protection functions of the system.
Assume a set S of operating conditions that the system may experience w Is S w ＝{W i 1,., N }, where N is the number of operating conditions.
The possible related events under different working conditions after the fault is generated are collected as S E Is S E ＝{E j J 1.. M }, where M is the maximum number of all possible events.
The related events refer to changes which can be detected based on sensor and state information collected by the system, such as sensor sampling value overrun, contactor action and the like.
The condition event timing signature of a transmission fault may be defined as follows:
Cx:W i1 :E j1 →W i2 :E j2 →...→W iL :E jL
wherein, W i1 ...W iL ∈S w The working condition which is possibly experienced after a certain fault Cx occurs;
l is the number of experienced conditions, referred to herein as the timing characteristic length;
"→" indicates a condition transition symbol.
The working condition event time sequence characteristic mode represents the fault type of the system, the caused series of working condition changes and the mapping relation of the event change process corresponding to various working conditions.
Therefore, the on-line diagnosis device and method for the short-circuit fault point of the secondary winding of the traction transformer can convert the fault diagnosis problem of the system into the identification problem of the working condition event time sequence characteristic mode.
The fault condition event of the secondary side short circuit is analyzed.
As can be seen from the schematic diagram of the main circuit of the traction system shown in fig. 1, the set of working condition events of the secondary side short circuit is related to the sampling values of the primary side current transformer and the secondary side current sensor, and the change of the sampling values corresponds to the corresponding working conditions.
When a secondary short-circuit fault occurs, sampling values of the primary current transformer TA and the secondary current sensor LH are obviously changed, and the change rule of the sampling values is strongly related to the corresponding working conditions.
Based on a circuit theory and a system control principle, a set of relevant events of sampling signals of a primary side current transformer TA and a secondary side current sensor LH when fault types under different working conditions are respectively C1-C4 is summarized as shown in Table 3:
TABLE 3 explanation of events related to minor edge short-circuit failure
In Table 3, I p For the primary current transformer TA sample value, I qc i is the sampling value of the secondary side current sensor of the traction transformer corresponding to the ith secondary side winding, i is the serial number of the corresponding secondary side winding
E i TA Representing the i-th event, E, associated with the sampling signal of the primary current transformer TA i LH Representing the i-th event associated with the secondary side current sensor LH sample signal.
I p LB ，I p1 LB And I p2 LB Short-circuit characteristic current in TA sampling signals of primary side current mutual sensors under different working conditions calculated based on system parameters belongs to a value set by pre-calculation
I qc LB And I qc1 LB The short-circuit current component in the signal is sampled for the secondary side current sensor LH.
Based on locomotive system parameter analysis and engineering application experience, only I qc LB The value far exceeds the system overcurrent protection threshold. If the system overcurrent protection threshold value is far exceeded, the possible value of overcurrent protection exceeds the sampling range of the sensor, and at the moment, the value can be set to be slightly larger than the value of the system overcurrent protection threshold value during engineering implementation so as to meet the sampling requirement.
ε 1 ～ε 8 The value of the error threshold is comprehensively set according to the allowable deviation of the short-circuit impedance and the impact current at the working condition switching moment.
Table 4 shows the related events of the secondary short-circuit faults C1 through C4 under different operating conditions, and as shown in table 4, the set of the related events of the fault types C1 through C4 under different operating conditions is summarized.
In table 4, Cx _ I (x ═ 1,2,3,4) indicates which specific fault can be located, and the secondary winding number where the fault point is located can be located.
TABLE 4 correlation events of the secondary side short-circuit faults C1-C4 under different working conditions
And analyzing the working condition event time sequence characteristic mode.
In the running process of the train, the change modes between the working conditions W1-W4 are mainly as follows: w1 → W2 → W3 → W4, W4 → W3, W4 → W1, W3 → W1, W2 → W1.
Based on the working condition change modes, corresponding working condition event time sequence characteristic modes are formed so as to realize rapid and accurate fault detection and positioning.
Operating condition W1, set of C1 related events { E } due to a secondary side short fault 1 TA ，E 4 LH And the positioning of a specific fault point cannot be realized, so that the next working condition can be associated for joint diagnosis.
At this time, a condition event timing characteristic pattern may be defined as in equation (1), when the set of events { E } is identified at condition W1 1 TA ，E 4 LH When the time is about to be long, a relevant fault is reported;
whether event set { E } exists when the system enters working condition W2 is detected again 2 TA ，E 4 LH ，E 6 LH }；
If the fault exists, the serial number of the winding where the fault exists can be accurately positioned.
C1:W1:{E 1 TA ，E 4 LH }→W2:{E 2 TA ，E 4 LH ，E 6 LH } (1)
Under the working conditions W3 and W4, the fault types of the secondary short-circuit faults C1 and C3 and the fault types of the secondary short-circuit faults C2 and C4 cannot be distinguished, so that the subsequent working condition event set is increased to realize diagnosis.
C1:W3:{E 4 TA ，E 4 LH ，E 5 LH }→W1:{E 1 TA ，E 4 LH } (2)
C2:W3:{E 4 TA ，E 1 LH ，E 5 LH }→W1:{E 1 TA ，E 1 LH } (3)
C3:W3:{E 4 TA ，E 4 LH ，E 5 LH }→W2:{E 3 TA ，E 4 LH ，E 6 LH } (4)
C4:W3:{E 4 TA ，E 1 LH ，E 5 LH }→W2:{E 3 TA ，E 3 LH ，E 6 LH } (5)
C1:W4:{E 4 TA ，E 4 LH ，E 5 LH ，E 2 LH }→W1:{E 1 TA ，E 4 LH } (6)
C2:W4:{E 4 TA ，E 1 LH ，E 5 LH ，E 2 LH }→W1:{E 1 TA ，E 1 LH } (7)
C3:W4:{E 4 TA ，E 4 LH ，E 5 LH ，E 2 LH }→W2:{E 3 TA ，E 4 LH ，E 6 LH } (8)
C4:W4:{E 4 TA ，E 1 LH ，E 5 LH ，E 2 LH }→W2:{E 3 TA ，E 3 LH ，E 6 LH } (9)
In summary, a set of all operating condition event signature patterns for fault types C1-C4 is obtained as shown in Table 5.
TABLE 5 operating condition event characteristic patterns corresponding to fault types C1-C4
Fig. 3 discloses a flowchart of a method for online diagnosing a short-circuit fault point of a secondary winding of a traction transformer according to an embodiment of the present invention, and in the embodiment shown in fig. 3, the method for online diagnosing a short-circuit fault point of a secondary winding of a traction transformer provided by the present invention includes an offline design process and an online implementation process, and a diagnosis and protection strategy can be performed based on the set of related working condition events and the set of working condition event timing characteristic patterns that establish the secondary short-circuit fault.
The off-line design process comprises the following steps:
setting all threshold parameters of a related event set of the secondary side short circuit fault shown in a table 3 based on system principle parameters and historical data, and analyzing fault working condition events to form related working condition event sets under different working conditions shown in a table 4;
and (3) analyzing the working condition event time sequence characteristic pattern by combining the related control logic of the train traction system, and establishing a working condition event time sequence characteristic pattern set corresponding to the fault type shown in the table 5.
The online implementation process comprises a fault detection step and a fault decision step.
In the embodiment shown in fig. 3, the fault detection step is implemented in a fault detection unit and the fault decision step is implemented in a fault decision unit.
The fault detection step is as follows:
the fault detection unit collects sensor signals of related events related to the secondary short-circuit fault and traction system state signals in real time, and judges whether the related events related to the secondary short-circuit fault are established or not by combining and comparing the definitions of all events in a working condition event set in an off-line design flow;
if yes, executing a fault protection action and entering a fault decision flow;
otherwise, if the signal monitoring is not successful, the signal monitoring is continued.
The fault detection step further comprises: and identifying working conditions, identifying events, judging events, protecting faults and the like.
The working condition identification is to realize the real-time identification of the current working condition according to the traction system state information (such as a main circuit breaker, a contactor state, a pulse rectifier/inverter starting state and the like).
The event identification is based on the primary current and the secondary current values acquired by the sensors, and the event E related to the secondary short-circuit fault is judged according to the definition of each event in the table 3 1 TA ～E 4 TA 、E 1 LH ～E 6 LH Whether or not it is present.
And the event judgment is that the event identification result is combined with the working condition identification result, whether related events of the secondary short-circuit fault under different working conditions exist or not is judged according to the table 4, if the related events exist, a fault mark is output, a corresponding fault protection action is executed, and the related events are output to a fault decision unit.
The fault protection is to execute protection actions such as blocking pulses and opening a main circuit breaker according to the results of event identification and working condition identification.
The fault decision step is as follows:
based on the relevant event information and the working condition information output by the fault detection unit, matching with each mode in the time sequence characteristic mode set in real time, and identifying whether 14 working condition event time sequence characteristic modes shown in the table 5 exist or not;
if the matching mode exists, outputting the corresponding fault type, and executing the relevant fault isolation action according to the fault isolation strategy shown in the table 6;
and if the matching mode does not exist, periodically updating the event and working condition information, continuing monitoring, and identifying the working condition event time sequence characteristic mode.
TABLE 6 Fault isolation strategy
As shown in table 6, differential protection isolation actions are performed based on specific fault points:
and when the fault type is C1-C2, the isolation strategy is to inhibit high voltage and isolate the converter where the fault winding is located.
When the fault type is C3-C4, the isolation strategy is to allow the main circuit to be closed, disconnect the charging of the converter corresponding to the fault winding and short-circuit the contactor, and block the pulse of the shaft pulse rectifier.
The invention provides a device and a method for diagnosing a short-circuit fault point of a secondary winding of a traction transformer on line, which can realize accurate positioning of the specific short-circuit fault point of the secondary winding of the traction transformer, and aims to overcome the defects that the conventional fault diagnosis method for the short-circuit of the secondary winding of the traction transformer by a rail transit vehicle is primary, cannot realize accurate fault point positioning, has high false alarm and missing report rate, has single protection and isolation action and has excessive protection.
The device and the method for online diagnosing the short-circuit fault point of the secondary winding of the traction transformer have the following beneficial effects.
1) The online accurate positioning of the short-circuit fault point of the secondary winding of the traction transformer can be realized;
2) differential protection isolation actions can be executed based on specific fault points, and the train availability is improved;
3) the existing hardware is not required to be changed, and the engineering is simple to realize.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (10)
1. The utility model provides a traction transformer secondary winding short-circuit fault point online diagnosis device which characterized in that, includes off-line design module and online realization module:
the off-line design module is used for setting threshold parameters of a related event set of the secondary short-circuit fault based on system principle parameters and historical data to form working condition event sets under different working conditions, and establishing a working condition event time sequence characteristic mode set corresponding to the fault type by combining with related control logic of a train traction system;
the online implementation module is connected with the offline design module and comprises a fault detection unit and a fault decision unit,
the fault detection unit collects sensor signals related to the secondary short-circuit fault and traction system state signals in real time, compares working condition event sets of the off-line design module, judges whether the related events of the secondary short-circuit fault are established or not, sends event information and working condition information to the fault decision unit if the related events are established, and continues to monitor signals if the related events are not established;
the fault decision unit is connected with the fault detection unit, is matched with the working condition event characteristic patterns in the time sequence characteristic pattern set in real time on the basis of the event information and the working condition information output by the fault detection unit, outputs corresponding fault types if the matched patterns exist, executes corresponding isolation strategies, and otherwise updates the event information and the working condition information and continues monitoring;
the working condition event set of the secondary side short circuit is related to sampling values of the primary side current transformer and the secondary side current sensor, and the change of the sampling values corresponds to the corresponding working condition;
the working condition event time sequence characteristic mode is a mapping relation of a fault type, a working condition and a corresponding working condition event or an associated adjacent working condition event.
2. The on-line diagnosis device for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 1, wherein the fault detection unit outputs a fault flag to perform a fault protection action if it is determined that the event related to the secondary short-circuit fault is established.
3. The on-line diagnosis device for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 1, wherein:
and the fault detection unit is used for identifying the current working condition in real time according to the state information of the traction system.
4. The on-line diagnosis device for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 1, wherein:
the fault detection unit judges whether the related event of the secondary short-circuit fault exists or not based on the primary current value and the secondary current value acquired by the sensor.
5. The on-line diagnostic device for the short-circuit fault point of the secondary winding of the traction transformer as recited in claim 1, wherein the isolation strategy comprises:
forbidding high voltage, and isolating the converter where the fault winding is located;
and allowing the main circuit to be switched on and switched off, disconnecting the charging of the converter corresponding to the fault winding and short-circuiting the contactor, and blocking the pulse of the shaft pulse rectifier.
6. An on-line diagnosis method for a short-circuit fault point of a secondary winding of a traction transformer is characterized by comprising an off-line design process and an on-line implementation process,
the off-line design process comprises the following steps:
setting threshold parameters of a related event set of the secondary side short circuit fault based on system principle parameters and historical data to form working condition event sets under different working conditions;
establishing a working condition event time sequence characteristic mode set corresponding to the fault type by combining the relevant control logic of the train traction system;
the online implementation process comprises a fault detection step and a fault decision step:
a fault detection step, namely acquiring a sensor signal related to a secondary short-circuit fault and a traction system state signal in real time, comparing a working condition event set of an offline design flow, judging whether the related event of the secondary short-circuit fault is established, if so, entering a fault decision step, and if not, continuing to monitor the signal;
a fault decision step, namely matching the event information and the working condition information with the working condition event characteristic patterns in the time sequence characteristic pattern set in real time, if the matched patterns exist, outputting corresponding fault types and executing a proper isolation strategy, otherwise, updating the event and the working condition information and continuing monitoring;
the working condition event set of the secondary side short circuit is related to sampling values of the primary side current transformer and the secondary side current sensor, and the change of the sampling values corresponds to the corresponding working condition;
the working condition event time sequence characteristic mode is a mapping relation of a fault type, a working condition and a corresponding working condition event or an associated adjacent working condition event.
7. The on-line diagnosis method for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 6, wherein the fault detection step outputs a fault flag to execute a fault protection action if the related event of the secondary short-circuit fault is determined to be true.
8. The on-line diagnosis method for the short-circuit fault point of the secondary winding of the traction transformer as recited in claim 6, wherein the fault detection step is to identify the current working condition in real time according to the state information of the traction system.
9. The on-line diagnosis method for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 6, wherein the fault detection step is to determine whether the event related to the secondary short-circuit fault exists based on the primary current and the secondary current values collected by the sensor.
10. The on-line diagnosis method for the short-circuit fault point of the secondary winding of the traction transformer as claimed in claim 6, wherein the isolation strategy comprises:
forbidding high voltage, and isolating the converter where the fault winding is located;
and allowing the main circuit to be switched on and switched off, disconnecting the charging of the converter corresponding to the fault winding and short-circuiting the contactor, and blocking the pulse of the shaft pulse rectifier.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103018592B (en) * | 2012-11-28 | 2016-04-06 | 西南交通大学 | The traction transformer faults diagnostic method of internal model control based PID controller |
| CN104407267B (en) * | 2014-11-26 | 2017-10-20 | 中国船舶重工集团公司第七一二研究所 | A kind of transformer fault detection method |
| CN107797014B (en) * | 2016-09-06 | 2020-05-22 | 株洲中车时代电气股份有限公司 | Diagnosis method for transformer secondary side short circuit |
| CN106405317B (en) * | 2016-10-12 | 2024-04-12 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding fault on-line monitoring device and diagnosis method |
| CN108051691A (en) * | 2017-11-30 | 2018-05-18 | 苏州汇川技术有限公司 | More secondary phase-shifting transformer short circuit detecting systems and method |
| CN110632435B (en) * | 2018-06-25 | 2021-09-14 | 中车株洲电力机车研究所有限公司 | Real-time diagnosis method for short-circuit fault of vehicle-mounted transformer in high-voltage running state |
| CN110927628B (en) * | 2018-08-31 | 2021-04-06 | 株洲中车时代电气股份有限公司 | Locomotive traction transformer secondary winding short circuit diagnosis method and device |
| CN110879372B (en) * | 2019-12-03 | 2021-04-23 | 中南大学 | Traction system main loop earth fault diagnosis method and system based on feature correlation |
| CN111142048B (en) * | 2019-12-31 | 2021-05-14 | 三峡大学 | Transformer winding short-circuit fault online detection method based on space three-dimensional curve analysis |
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