CN111596225A - Power supply equipment and detection method for short-circuit fault of traction transformer - Google Patents
Power supply equipment and detection method for short-circuit fault of traction transformer Download PDFInfo
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/62—Testing of transformers
Abstract
The application discloses a method for detecting short-circuit faults of power supply equipment and a traction transformer, which comprises the following steps: acquiring the total secondary current of the four secondary windings and the primary current of the primary winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain primary converted current; acquiring a difference value between a primary side conversion current and a primary side current; and when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault. In the initial stage of the short circuit of the traction transformer, the secondary current of the secondary winding is increased, so that the primary current is also increased. The method comprises the steps of detecting a primary current of a primary winding and secondary total currents of four secondary windings, obtaining a primary converted current through the secondary total currents and a transformation ratio of a traction transformer, calculating a difference value of the primary converted current and the primary current, and determining that the traction transformer has a short-circuit fault through the difference value. Therefore, the detection method provided by the embodiment of the application can identify the short-circuit fault at the initial stage of the short-circuit fault of the traction transformer.
Description
Technical Field
The application relates to the technical field of railway vehicles, in particular to a power supply device and a method for detecting a short-circuit fault of a traction transformer.
Background
The traction transformer is used for being connected with a contact network through a pantograph, reducing the voltage of single-phase alternating current provided by the contact network and then outputting the single-phase alternating current to a traction converter connected with the traction transformer.
Because the cable connecting the traction converter and the traction transformer is usually positioned between two carriages, the power bridge cable and the power connector at the vehicle end are occasionally damaged abnormally in the running process of the railway vehicle, and further a short-circuit fault occurs.
At the initial stage of short-circuit fault, the short-circuit current is small, and short-circuit fault alarm of the traction transformer cannot be caused. However, as the rail vehicle runs, the degree of insulation damage increases, and the short-circuit current increases, thereby burning the traction transformer.
Disclosure of Invention
In order to solve the technical problem, the application provides a power supply device and a method for detecting a short-circuit fault of a traction transformer, which can identify the short-circuit fault at the initial stage of the short-circuit fault.
The embodiment of the application discloses the following technical scheme:
in a first aspect, the present application provides a power supply apparatus comprising a traction transformer, a first traction converter, a second traction converter, and a controller; the traction transformer comprises a primary winding and four secondary windings; the first side of the traction transformer is connected with the first traction converter, and the second side of the traction transformer is connected with the second traction converter; the controller is used for acquiring the total secondary side current of the four secondary side windings and the primary side current of the primary side winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault; the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding.
Optionally, the traction transformer is connected to the first traction converter through a cable; the preset difference threshold is positively correlated with the rated current of the cable.
Optionally, the controller is further configured to cut off connection between the traction transformer and a catenary when a duration of the short-circuit fault of the traction transformer exceeds a preset time threshold.
Optionally, the preset time threshold is inversely related to the difference.
Optionally, obtaining the total secondary current of the four secondary windings includes: acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period; and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
In a second aspect, the present application provides a method for detecting a short-circuit fault of a traction transformer, where the traction transformer includes a primary winding and four secondary windings; the method comprises the following steps: acquiring the total secondary currents of the four secondary windings and the primary current of the primary winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault; the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding.
Optionally, the preset difference threshold is positively correlated with a rated current of a cable, and the cable is used for connecting the traction transformer and the traction converter.
Optionally, the method further includes: and when the duration time of the short-circuit fault of the traction transformer exceeds a preset time threshold, cutting off the connection between the traction transformer and a contact network.
Optionally, the preset time threshold is inversely related to the difference.
Optionally, the four secondary windings include: a first secondary winding, a second secondary winding, a third secondary winding and a fourth secondary winding; obtaining the secondary total current of the four secondary windings comprises: acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period; and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
According to the technical scheme, the method has the following advantages:
according to the power supply equipment and the detection method for the short-circuit fault of the traction transformer, the traction transformer comprises a primary winding and four secondary windings; the method comprises the following steps: acquiring the total secondary currents of the four secondary windings and the primary current of the primary winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault; the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding. The method comprises the steps of detecting the primary side current of a primary side winding and the total secondary side currents of four secondary side windings, obtaining the primary side converted current through the total secondary side currents and the transformation ratio of a traction transformer, calculating the difference value of the primary side converted current and the primary side current, and determining that the short-circuit fault occurs in the traction transformer when the difference value is larger than a preset difference value threshold value. Therefore, the detection method provided by the embodiment of the application can identify the short-circuit fault at the initial stage of the short-circuit fault of the traction transformer.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power supply device according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for detecting a short-circuit fault of a traction transformer according to an embodiment of the present application.
Detailed Description
In the running process of the railway vehicle, the traction transformer is in short circuit fault due to abnormal damage of a power bridge cable and a power connector at the vehicle end. However, at the initial stage of the short-circuit fault, the short-circuit current is small, and the short-circuit fault alarm of the traction transformer cannot be triggered. However, with the operation of the rail vehicle, the degree of insulation damage is increased, and the short-circuit current is increased, so that the traction transformer is burnt.
In order to solve the above problems, the present application provides a power supply device and a method for detecting a short-circuit fault of a traction transformer. The controller of the power supply equipment can obtain the total secondary currents of the four secondary windings and the primary current of the primary winding, and then the total secondary currents are converted according to the transformation ratio of the traction transformer to obtain primary converted current; and determining whether the short-circuit fault occurs in the traction transformer or not through the difference value of the primary side converted current and the primary side current.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The first embodiment is as follows:
the first embodiment of the present application provides a power supply device, which is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a schematic diagram of a power supply device according to an embodiment of the present application.
The power supply apparatus includes: a traction transformer 100, a first traction converter 200, a second traction converter 300 and a controller 400.
The traction transformer 100 includes a primary winding 101 and four secondary windings, which are a first secondary winding 102, a second secondary winding 103, a third secondary winding 104, and a fourth secondary winding 105.
The first primary winding 102 and the second primary winding 103 are used to connect the traction transformer 100 and the first traction converter 200, so that the traction transformer 100 transfers the electric energy to the first traction converter 200.
Similarly, the third primary winding 103 and the fourth primary winding 104 are used to connect the traction transformer 100 and the second traction converter 300, so that the traction transformer 100 transfers the electric energy to the second traction converter 300.
In order to detect the current of the four secondary windings, a current transformer is arranged on the secondary windings to obtain the current of the secondary windings.
Specifically, the first current transformer 201 is used for obtaining the current of the first secondary winding 102, the second current transformer 202 is used for obtaining the current of the second secondary winding 103, the third current transformer 301 is used for obtaining the current of the third secondary winding 104, the fourth current transformer 302 is used for obtaining the current of the fourth secondary winding 105, and the fifth current transformer 106 is used for obtaining the current of the primary winding 101.
Each current transformer is connected to the controller, and transmits current data to the controller 400 after the current transformers detect the current data.
The controller 400 is configured to obtain a total secondary current of the four secondary windings and a primary current of the primary winding 101; converting the secondary total current according to the transformation ratio of the traction transformer 100 to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; and when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault.
As shown in fig. 1, the cable 500 may be hit by foreign objects during operation of a vehicle exposed outside the vehicle cabin, so that the outer insulation layer of the cable 500 is damaged, and thus two lines in the cable 500 are shorted, thereby causing a short-circuit fault of the traction transformer 100.
The specific value of the preset difference threshold is not limited in the application, and may be 10A, 13A, or 15A, and the value range of the preset difference threshold is 10A-15A.
In addition, in order to further improve the accuracy of the determination and reduce the error of the determination, after the current transformer detects the current data, the current data may be transmitted to the controller 400 through the ethernet. The transmission speed of the Ethernet is high and can reach 100Mbit/s, and no large delay is generated, and after the controller receives the current data, the current data collected by the five current transformers can be considered to be data at the same moment, so that the judgment error is reduced.
The judgment error is reduced by the transmission speed, and the judgment error is reduced by increasing the sampling frequency of the current transformer.
The current transformer may implement high frequency sampling, for example, up to a hundred KHz level.
It should be noted that the preset difference threshold is positively correlated to the rated current of the cable 500. When the rated current of the cable 500 is large, the preset difference threshold may be set large. When the rated current of the cable 500 is small, the preset difference threshold may be set small.
In order to prevent the traction transformer 100 from being damaged by the short-circuit fault, the controller 400 may disconnect the traction transformer 100 from the traction converter in which the short circuit occurs immediately after the short-circuit fault is determined. So that the primary current of the traction transformer 100 is always in a safe range.
Optionally, in order to prevent the traction transformer 100 from being damaged due to the short-circuit fault, the controller 400 may record the duration of the short-circuit fault occurring in the traction transformer 100 after determining the short-circuit fault, and disconnect the traction transformer 100 from the traction converter with the short circuit when the duration exceeds a preset time threshold. Thereby placing the primary current of the traction transformer 100 in a safe range interval.
The size of the preset time threshold is not limited, and the preset time threshold can be 2s or 3 s.
The preset time threshold is inversely related to the difference between the primary scaled current and the primary current, i.e. the smaller the difference, the larger the preset time threshold, the longer the duration of the occurrence of the short circuit condition may be.
In order to improve the accuracy of judging the short-circuit fault, the total secondary current of the four secondary windings may be obtained as follows: acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period; and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
The embodiment of the application provides power supply equipment, which comprises a traction transformer, a first traction converter, a second traction converter and a controller; the traction transformer comprises a primary winding and four secondary windings; the first side of the traction transformer is connected with the first traction converter, and the second side of the traction transformer is connected with the second traction converter; the controller is used for acquiring the total secondary side current of the four secondary side windings and the primary side current of the primary side winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault; the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding. The method comprises the steps of detecting the primary side current of a primary side winding and the total secondary side currents of four secondary side windings, obtaining the primary side converted current through the total secondary side currents and the transformation ratio of a traction transformer, calculating the difference value of the primary side converted current and the primary side current, and determining that the short-circuit fault occurs in the traction transformer when the difference value is larger than a preset difference value threshold value. Therefore, the detection method provided by the embodiment of the application can identify the short-circuit fault at the initial stage of the short-circuit fault of the traction transformer.
Example two:
the second embodiment of the present application provides a method for detecting a short-circuit fault of a traction transformer, which is described in detail below with reference to the accompanying drawings.
Referring to fig. 2, the drawing is a flowchart of a method for detecting a short-circuit fault of a traction transformer according to an embodiment of the present application.
The method is applied to a railway vehicle, wherein the railway vehicle comprises a traction transformer and a traction converter, and specific reference can be made to the first embodiment of the application. The method comprises the following steps:
step 201: and acquiring the total secondary current of the four secondary windings and the primary current of the primary winding.
Step 202: converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; and acquiring the difference value of the primary converted current and the primary current.
Step 203: and when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault.
It should be noted that, the transformation ratio of the traction transformer is a ratio of the number of turns of the primary winding to the number of turns of the single secondary winding.
Optionally, the traction transformer is connected to the first traction converter through a cable; the preset difference threshold is positively correlated with the rated current of the cable.
Optionally, the controller is further configured to cut off connection between the traction transformer and a catenary when a duration of the short-circuit fault of the traction transformer exceeds a preset time threshold.
Optionally, the preset time threshold is inversely related to the difference.
Optionally, obtaining the total secondary current of the four secondary windings includes: acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period; and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
According to the power supply equipment and the detection method for the short-circuit fault of the traction transformer, the traction transformer comprises a primary winding and four secondary windings; the method comprises the following steps: acquiring the total secondary currents of the four secondary windings and the primary current of the primary winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault; the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding. The method comprises the steps of detecting the primary side current of a primary side winding and the total secondary side currents of four secondary side windings, obtaining the primary side converted current through the total secondary side currents and the transformation ratio of a traction transformer, calculating the difference value of the primary side converted current and the primary side current, and determining that the short-circuit fault occurs in the traction transformer when the difference value is larger than a preset difference value threshold value. Therefore, the detection method provided by the embodiment of the application can identify the short-circuit fault at the initial stage of the short-circuit fault of the traction transformer.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, they are described in a relatively simple manner, and reference may be made to some descriptions of method embodiments for relevant points. The above-described system embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A power supply device is characterized by comprising a traction transformer, a first traction converter, a second traction converter and a controller; the traction transformer comprises a primary winding and four secondary windings;
the first side of the traction transformer is connected with the first traction converter, and the second side of the traction transformer is connected with the second traction converter;
the controller is used for acquiring the total secondary side current of the four secondary side windings and the primary side current of the primary side winding; converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current; when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault;
the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding.
2. The power supply apparatus according to claim 1, wherein the traction transformer is connected to the first traction converter by a cable;
the preset difference threshold is positively correlated with the rated current of the cable.
3. The power supply equipment according to claim 1, wherein the controller is further configured to disconnect the traction transformer from a catenary when a duration of the short-circuit fault of the traction transformer exceeds a preset time threshold.
4. The power supply apparatus of claim 3 wherein said preset time threshold is inversely related to said difference.
5. The power supply device of any one of claims 1-5, wherein obtaining the secondary total current for the four secondary windings comprises:
acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period;
and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
6. The method for detecting the short-circuit fault of the traction transformer is characterized in that the traction transformer comprises a primary winding and four secondary windings; the method comprises the following steps:
acquiring the total secondary currents of the four secondary windings and the primary current of the primary winding;
converting the total secondary current according to the transformation ratio of the traction transformer to obtain a primary converted current; acquiring a difference value between the primary side conversion current and the primary side current;
when the difference value is larger than a preset difference value threshold value, determining that the traction transformer has a short-circuit fault;
the transformation ratio of the traction transformer is the ratio of the number of turns of the primary winding to the number of turns of the single secondary winding.
7. The method of claim 6, wherein the predetermined difference threshold is positively correlated to a rated current of a cable used to connect the traction transformer and the traction converter.
8. The method of claim 6, further comprising:
and when the duration time of the short-circuit fault of the traction transformer exceeds a preset time threshold, cutting off the connection between the traction transformer and a contact network.
9. The method of claim 8, wherein the predetermined time threshold is inversely related to the difference.
10. The method of any of claims 6-9, wherein the four secondary windings comprise: a first secondary winding, a second secondary winding, a third secondary winding and a fourth secondary winding;
obtaining the secondary total current of the four secondary windings comprises:
acquiring a first current effective value of a first secondary winding, a second current effective value of a second secondary winding, a third current effective value of a third secondary winding and a fourth current effective value of a fourth secondary winding in a target period;
and taking the sum of four terms of the first current effective value, the second current effective value, the third current effective value and the fourth current effective value as the secondary side total current.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112180299A (en) * | 2020-09-28 | 2021-01-05 | 国网山东省电力公司莱芜供电公司 | 10kV distribution transformer turn-to-turn short circuit fault online monitoring method |
| CN112924755A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Transformer monitoring method and device based on short-circuit current and storage medium |
| CN112924755B (en) * | 2020-12-30 | 2022-03-04 | 广东电网有限责任公司电力科学研究院 | Transformer monitoring method and device based on short-circuit current and storage medium |
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Application publication date: 20200828 |