CN111077440A - Traction converter and method, device and equipment for detecting state of contactor of traction converter - Google Patents
Traction converter and method, device and equipment for detecting state of contactor of traction converter Download PDFInfo
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- CN111077440A CN111077440A CN201811221343.5A CN201811221343A CN111077440A CN 111077440 A CN111077440 A CN 111077440A CN 201811221343 A CN201811221343 A CN 201811221343A CN 111077440 A CN111077440 A CN 111077440A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application discloses a method for detecting the state of a contactor in a traction converter, which comprises the following steps: acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor; judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact; if so, determining the real opening and closing state of a main contact of the contactor; if not, the auxiliary contact of the contactor is judged to have a false detection fault. The normally open auxiliary contact and the normally closed auxiliary contact of the contactor are simultaneously detected, the false detection of the opening and closing state of the main contact can be avoided, and the limitation starting of a locomotive traction converter system after fault missing report, false report and fault false report of the main contact is further avoided. The method and the device effectively improve the reliability and accuracy of the detection result of the contactor state, and also improve the stability and safety in the driving process. The application also provides a traction converter and a state detection device and equipment of the contactor of the traction converter, and the traction converter and the contactor have the beneficial effects.
Description
Technical Field
The application relates to the technical field of locomotive traction transmission, in particular to a traction converter and a method, a device and equipment for detecting the state of a contactor of the traction converter.
Background
With the development of national economy, the transportation industry of China, particularly rail transportation, makes great progress.
The traction converter is a core component in a locomotive transmission system, and the reliability, the availability and the operation efficiency of the traction converter are directly related to the operational efficiency. In traction converters, the opening and closing of the contactors directly determines the input of energy in the circuit and is therefore considered to be one of the most important components besides the power module. The good opening and closing control performance of the contactor is very important for the normal work of the traction converter circuit.
Generally, the opening and closing of the contactor refers to the opening and closing of a main contact connected to a controlled circuit, and an auxiliary contact operating in association with the main contact is generally connected to a detection circuit so as to determine the opening and closing state of the main contact by detecting the opening and closing state of the auxiliary contact. However, the contacts of the contactor are easily polluted in the long-term use process, so that the detection result obtained by the auxiliary contacts is inaccurate and contradicts the real opening and closing state of the main contacts, the fault report or report missing phenomenon of the main contacts further occurs, and the driving safety is seriously threatened.
Therefore, what kind of state detection technology of the contactor in the traction converter is adopted is convenient for improving the accuracy and the reliability of the detection result, and the phenomena of false alarm and missing report of the fault of the contactor are avoided, so that the driving safety performance is effectively improved, and the technical problem to be solved by technical personnel in the field is urgently needed.
Disclosure of Invention
The application aims to provide a traction converter and a method, a device and equipment for detecting the state of a contactor of the traction converter, so that the accuracy and the reliability of a detection result are improved, the phenomena of false alarm and missing alarm of faults of the contactor are avoided, and the driving safety performance is effectively improved.
In order to solve the technical problem, the present application provides a method for detecting a state of a contactor in a traction converter, including:
acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact;
if so, determining the real opening and closing state of a main contact of the contactor;
if not, judging that the auxiliary contact of the contactor has a false detection fault.
Optionally, after the determining the true open/close state of the main contact of the contactor, the method further includes:
if the real opening and closing state of the main contact is the same as the theoretical opening and closing state, judging that the working state of the main contact is normal;
and if the real opening and closing state of the main contact is opposite to the theoretical opening and closing state, judging that the main contact breaks down so as to carry out fault protection on the traction converter.
Optionally, after the determining that the auxiliary contact of the contactor has the false detection fault, the method further includes:
obtaining circuit state parameters in the traction converter;
judging whether the change condition of the circuit state parameter is matched with the theoretical opening and closing state of the main contact;
if so, judging that the working state of the main contact is normal;
if not, the main contact is judged to have a fault.
Optionally, the circuit state parameters include an input current and an intermediate dc voltage in the traction converter.
Optionally, the contactor is a main contactor connected between the output end of the transformer and the input end of the rectifier module;
if the theoretical open-close state of the main contact is a closed state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage have rising inflection points or not, and if so, judging that the working state of the main contact is normal; if not, judging that the main contact has a card separation fault;
if the theoretical open-close state of the main contact is an open state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct-current voltage both decrease, if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have a clamping fault.
Optionally, the contactor is a pre-charging contactor, one end of which is connected with the output end of the transformer, and the other end of which is connected with the input end of the rectifier module through a charging current-limiting resistor;
if the theoretical open-close state of the main contact is a closed state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage both rise or not, and if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have a card separation fault.
The application also provides a state detection device of contactor among traction converter, includes:
the acquisition module is used for acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the judging module is used for judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact; if so, determining the real opening and closing state of a main contact of the contactor; if not, judging that the auxiliary contact of the contactor has a false detection fault.
The present application also provides a state detection device of a contactor in a traction converter, including:
the detection circuit is used for detecting the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the controller is configured to execute a pre-stored computer program to implement the steps of any of the above described methods of detecting the status of the contactors in the traction converter.
Optionally, the detection circuit includes the contactor, a dc power supply, a first shunt resistor, and a second shunt resistor;
the first end of the normally closed auxiliary contact is connected with the positive electrode of the direct current power supply; the second end of the normally closed auxiliary contact is connected with the negative electrode of the direct-current power supply through the first shunt resistor and is used as a normally closed detection end to be connected with the controller, so that the opening and closing state of the normally closed auxiliary contact can be obtained according to the potential of the normally closed detection end;
the first end of the normally-open auxiliary contact is connected with the positive electrode of the direct-current power supply; and the second end of the normally open auxiliary contact is connected with the negative electrode of the direct-current power supply through the second shunt resistor and is connected with the controller as a normally open detection end so as to obtain the opening and closing state of the normally open auxiliary contact according to the potential of the normally open detection end.
The present application also provides a traction converter comprising a status detection device for a contactor in any of the traction converters as described above.
The method for detecting the state of the contactor in the traction converter comprises the following steps: acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor; judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact; if so, determining the real opening and closing state of a main contact of the contactor; if not, judging that the auxiliary contact of the contactor has a false detection fault.
It is obvious that, compared with the prior art, in the method for detecting the state of the contactor in the traction converter, the normally open auxiliary contact and the normally closed auxiliary contact of the contactor are simultaneously detected, and the open-close states of the contactor and the normally closed auxiliary contact are matched and compared, so that the condition that pollution of the respective auxiliary contacts is out of alignment can be effectively identified, the false detection of the open-close state of the main contact is effectively avoided, and the limited starting of a locomotive traction converter system after the fault missing report, the false report and the fault misinformation of the main contact are further avoided. The method and the device effectively improve the reliability and accuracy of the detection result of the contactor state, and also improve the stability and safety in the driving process. The traction converter and the state detection device and equipment of the contactor of the traction converter can achieve the state detection method of the contactor in the traction converter, and also have the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is an application scenario diagram of a method for detecting a state of a contactor in a traction converter according to the present application;
fig. 2 is a flow chart of a method for detecting a state of a contactor in a traction converter according to the present disclosure;
FIG. 3 is a flow chart of yet another method of detecting the status of contactors in a traction converter as provided herein;
fig. 4 is a partial circuit structure diagram of a traction converter provided in the present application;
fig. 5 is a block diagram illustrating a state detection apparatus for contactors in a traction converter according to the present disclosure;
fig. 6 is a circuit structure diagram of a detection circuit provided in the present application.
Detailed Description
The core of the application lies in providing a traction converter and a method, a device and equipment for detecting the state of a contactor of the traction converter, so that the accuracy and the reliability of a detection result are improved, the phenomena of false alarm and missing alarm of faults of the contactor are avoided, and the driving safety performance is effectively improved.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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.
Referring to fig. 1, fig. 1 is a view illustrating an application scenario of a method for detecting a state of a contactor in a traction converter according to the present disclosure.
As shown in fig. 1, a locomotive traction system includes associated detection circuitry and a controller for detecting the status of the contactors. As mentioned above, the main contact of the contactor is a switch connected to the controlled circuit, and the auxiliary contact acting in conjunction with the main contact is connected to the detection circuit, and the detection circuit transmits the detected potential to the controller, so that the controller can determine the open-close state of the main contact according to the open-close state of the auxiliary contact. Typically, a dedicated control unit, such as a transmission control unit TCU, is provided in the locomotive control system to serve as the controller.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for detecting a state of a contactor in a traction converter, applied to the controller, which mainly includes the following steps:
s1: and acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor.
S2: judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact; if yes, go to S3; if not, the process proceeds to S4.
S3: and determining the real opening and closing state of the main contact of the contactor.
S4: and judging that the auxiliary contact of the contactor has a false detection fault.
In particular, the auxiliary contacts of a contactor generally fall into two categories: a normally open auxiliary contact and a normally closed auxiliary contact. The main contact of the contactor also belongs to a normally open contact, namely the contactor is in a closed state after being electrified and receiving a closing instruction, and the contactor is in an open state when being powered off, so that the open-close state of the normally open auxiliary contact is completely consistent with the open-close state of the main contact, and the open-close state of the normally closed auxiliary contact is opposite to the open-close state of the main contact. That is, when the contactor (main contact) is closed, the normally open auxiliary contact is also closed and the normally closed auxiliary contact is opened; when the contactor (main contact) is open, the normally open auxiliary contact is also open and the normally closed auxiliary contact is closed.
In the state detection method for the contactor provided by the application, the open-close state of at least one normally-open auxiliary contact and at least one normally-close auxiliary contact is detected at the same time, rather than only one auxiliary contact (normally-open auxiliary contact or normally-close auxiliary contact) as in the prior art. Of course, a plurality of normally-open auxiliary contacts and a plurality of normally-closed auxiliary contacts can be adopted, and the higher the number is, the higher the reliability of the result is.
Generally, the detection circuit is provided with a dc power supply connected to one end of the auxiliary contact, and when the auxiliary contact is closed, a high level is detected at the other end, whereby the controller can recognize that the auxiliary contact is in a closed state, and conversely, when a low level is detected at the other end, the controller can recognize that the auxiliary contact is in an open state.
After the opening and closing states of the normally closed auxiliary contact and the normally open auxiliary contact are obtained, the controller can judge whether the normally closed auxiliary contact and the normally open auxiliary contact are matched or not. It should be noted that if the open-close states of the normally-closed auxiliary contact and the normally-open auxiliary contact are opposite, that is, one of the normally-closed auxiliary contact and the normally-open auxiliary contact is closed and one of the normally-open auxiliary contact is open, the normally-closed auxiliary contact and the normally-open auxiliary contact are matched, otherwise, the normally-closed.
If the two are matched, the detection results of the normally closed auxiliary contact and the normally open auxiliary contact are matched and consistent, and the real opening and closing state of the contactor (main contact) can be reflected, so that the opening and closing state of the normally open auxiliary contact can be determined as the real opening and closing state of the main contact.
If the two are not matched, the situation that contact pollution and inaccurate detection necessarily exist in the normally closed auxiliary contact and the normally open auxiliary contact is shown. Since it cannot be determined which auxiliary contact is in failure, the actual opening and closing state of the main contact cannot be obtained only by the auxiliary contact. Therefore, the auxiliary contact of the contactor can be judged to have a false detection fault so as to show that the detection result of any auxiliary contact cannot be adopted, and the false alarm and the false negative alarm of the contactor (the main contact) are avoided.
Once the actual opening and closing state of the contactor is detected by mistake and the contactor is judged to be blocked or blocked, a locomotive control system can take a series of circuit protection measures, such as blocking a traction converter, leading the locomotive to lose part of power, or forbidding high voltage of the whole locomotive, leading the locomotive to be incapable of running. Therefore, the malfunction and false alarm of the contactor caused by the false detection of the opening and closing state of the contactor can greatly affect the normal operation of the locomotive, and therefore, the malfunction and false alarm should be avoided as much as possible. In addition, failure and failure report will bring greater threat to the safe operation of the locomotive, and should be avoided at great lengths.
As will be readily understood by those skilled in the art, the contactor stuck-open fault refers to the fact that a contactor (main contact) is stuck in an open condition and cannot be normally closed, and the contactor stuck-open fault refers to the fact that the contactor (main contact) is stuck in a closed condition and cannot be normally opened.
Therefore, according to the method for detecting the state of the contactor in the traction converter, the normally open auxiliary contact and the normally closed auxiliary contact of the contactor are detected simultaneously, the open-close states of the contactor and the normally closed auxiliary contact are matched and compared, the condition that pollution of the respective auxiliary contacts is out of alignment can be effectively identified, the error detection of the open-close state of the main contact is effectively avoided, and the limited starting of the locomotive traction converter system after fault missing report, error report and fault error report of the main contact is further avoided. The method and the device effectively improve the reliability and accuracy of the detection result of the contactor state, and also improve the stability and safety in the driving process.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for detecting a state of a contactor in a traction converter according to another embodiment of the present disclosure.
As shown in fig. 3, the method for detecting the state of the contactor in the traction converter provided by the present application, based on the above, as a preferred embodiment, after determining the true open/close state of the main contact of the contactor at S33, further includes:
s34: judging whether the real opening and closing state of the main contact is the same as the theoretical opening and closing state; if yes, go to S38; if not, the process proceeds to S39.
S38: and judging that the working state of the main contact is normal.
S39: and judging that the main contact is in fault so as to carry out fault protection on the traction converter.
Specifically, after the actual opening and closing state of the main contact of the contactor is determined through S3, the actual opening and closing state can be compared with the theoretical opening and closing state, so that the clamping fault and the blocking fault of the main contact of the contactor can be found in time. The theoretical open-close state is the open-close state that the main contact is supposed to be under the current control command.
Specifically, if the theoretical open-close state is a closed state and the real open-close state is an open state, the main contact is blocked; if the theoretical open-close state is an open state, and the real open-close state is a closed state, the main contact is clamped.
As mentioned above, after determining that the main contact is faulty, the transmission control unit may initiate corresponding fault protection measures. If the main contact is blocked, a measure of blocking the traction converter can be generally adopted; if the main contact is engaged, the high voltage is generally prohibited for the whole vehicle.
Based on the above, as shown in fig. 3, as a preferred embodiment, the S35 further includes, after determining that the auxiliary contact of the contactor has the false detection fault:
s36: and acquiring circuit state parameters in the traction converter.
S37, judging whether the change condition of the circuit state parameter is matched with the theoretical opening and closing state of the main contact; if yes, go to S38; if not, the process proceeds to S39.
S38: and judging that the working state of the main contact is normal.
S39: and judging that the main contact is in failure.
Specifically, when it is determined that the auxiliary contact has the false detection condition through S4, the circuit state parameter in the circuit can be combined to further determine whether the main contact is working normally. The circuit state parameter can reflect the real opening and closing state of the main contact, and if the circuit state parameter is inconsistent with the theoretical opening and closing state, the real opening and closing state is inconsistent with the theoretical opening and closing state, and a fault is bound to occur.
Referring to fig. 4, fig. 4 is a partial circuit structure diagram of a traction converter provided in the present application. The main contactor KM1 (main contact) is connected between the secondary output end of the transformer and the rectifying module, one end of the pre-charging contactor KM2 (main contact) is connected with the secondary output end of the transformer, the other end of the pre-charging contactor KM2 is connected with the charging current-limiting resistor R, and the other end of the charging current-limiting resistor R is connected with the input end of the rectifying module. The current sensor CT is used for detecting the input current of the traction converter; the voltage sensor PT is used for detecting intermediate direct-current voltage; the support capacitor Cd is used to stabilize the intermediate dc voltage.
Preferably, the circuit state parameters include the input current and the intermediate dc voltage in the traction converter, which can be measured by the current sensor CT and the voltage sensor PT in fig. 4, respectively.
Specifically, in one embodiment, the contactor to be detected is a main contactor KM1 connected between the output end of the transformer and the input end of the rectification module;
if the theoretical open-close state of the main contact is a closed state, judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage have rising inflection points, if so, judging that the working state of the main contact is normal; if not, judging that the main contact has a card separation fault;
if the theoretical open-close state of the main contact is the open state, judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct-current voltage are both reduced or not, and if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have the clamping fault.
Specifically, the main contactor KM1 in the traction converter is a switch for controlling the power input, and when the main contactor is closed, the input current and the intermediate dc voltage will sharply rise, i.e., there will be a rising inflection point. Therefore, if the detected contactor is the main contactor KM1, the change condition of the circuit state parameter can be used as a basis for matching with the theoretical open-close state of the closing; otherwise, the reverse is carried out. On the basis of the above, those skilled in the art can further set a specific threshold value for the rising slope for judgment.
Specifically, in another embodiment, the contactor to be detected is a pre-charging contactor KM2, one end of which is connected with the output end of the transformer, and the other end of which is connected with the input end of the rectifier module through a charging current-limiting resistor R;
if the theoretical open-close state of the main contact is a closed state, judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage both rise or not, and if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have the card separation fault.
Specifically, the precharge contactor KM2 was connected in series with a charging current limiting resistor R for suppressing a sudden rise in current, and therefore, when the precharge contactor KM2 was closed, the input current and the intermediate dc voltage would also have a rising change, but were slightly gentle compared to the contactor KM1, and there was no significant inflection point. Therefore, the change of the input current and the rise of the intermediate direct current voltage can be used as the basis matched with the closed theoretical opening and closing state, so that the card separation fault of the main contact can be judged.
It is easily understood that, for the precharge contactor KM2, the clamping fault does not have a great influence on the traction converter, so a person skilled in the art can choose whether to determine the clamping fault.
Generally, when the precharge contactor KM2 has a trip or a snap-in failure, a protection measure for blocking the traction converter may be taken.
The following describes a state detection device for contactors in a traction converter provided in the present application.
Referring to fig. 5, fig. 5 is a block diagram illustrating a structure of a device for detecting a state of a contactor in a traction converter according to the present disclosure; comprises an acquisition module 51 and a judgment module 52;
the acquisition module 51 is used for acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the judging module 52 is configured to judge whether the open-close state of the normally-closed auxiliary contact matches the open-close state of the normally-open auxiliary contact; if so, determining the real opening and closing state of a main contact of the contactor; if not, the auxiliary contact of the contactor is judged to have a false detection fault.
Therefore, the state detection device of the contactor in the traction converter provided by the application can effectively identify the condition that the pollution of each auxiliary contact is out of alignment by simultaneously detecting the normally open auxiliary contact and the normally closed auxiliary contact of the contactor and matching and comparing the opening and closing states of the normally open auxiliary contact and the normally closed auxiliary contact, further effectively avoid the false detection of the opening and closing state of the main contact, and further avoid the limited starting of the locomotive traction converter system after the fault missing report, the false report and the fault misinformation of the main contact. The method and the device effectively improve the reliability and accuracy of the detection result of the contactor state, and also improve the stability and safety in the driving process.
The application also provides a state detection device of the contactor in the traction converter, which comprises a detection circuit and a controller;
the detection circuit is used for detecting the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the controller is adapted to execute a pre-stored computer program to implement the steps of any of the method of detecting the condition of the contactors in the traction converter as described above.
Referring to fig. 6, fig. 6 is a circuit structure diagram of a detection circuit provided in the present application.
On the basis of the above embodiment, the detection circuit includes a contactor KM, a direct-current power supply E, a first shunt resistor Rf1, and a second shunt resistor Rf 2;
the first end of the normally closed auxiliary contact Q _ b is connected with the positive electrode of the direct-current power supply E; a second end of the normally closed auxiliary contact Q _ b is connected with a negative electrode of the direct-current power supply E through a first shunt resistor Rf1, and is connected with the controller as a normally closed detection end, so as to obtain an open-close state of the normally closed auxiliary contact Q _ b according to a potential of the normally closed detection end;
the first end of the normally-open auxiliary contact Q _ k is connected with the positive electrode of the direct-current power supply E; the second end of the normally open auxiliary contact Q _ k is connected to the negative electrode of the dc power supply E through a second shunt resistor Rf2, and is connected to the controller as a normally open detection end, so as to obtain the open/close state of the normally open auxiliary contact Q _ k according to the potential of the normally open detection end.
Specifically, the detection circuit in the contactor state detection device provided by the present application does not adopt a capacitive discharge manner to clean the auxiliary contact as in the prior art, but forms a current loop when the auxiliary contact is closed by providing the dc power supply E and a shunt resistor, and achieves the purpose of cleaning the auxiliary contact by using a stable current flowing through the resistor, so as to correct the misalignment of the auxiliary contact.
It is easy to understand that compared with the instant discharge of a capacitor, the resistance discharge loop adopted by the application can obtain more stable discharge current, and effectively improves the cleaning capability of the auxiliary contact. Of course, a person skilled in the art can select a proper resistance value to make the total current flowing through the main contact be the rated maximum current of the main contact, so that the discharge current can be increased as much as possible on the premise of ensuring the circuit safety, and the cleaning effect is improved.
The present application also provides a traction converter comprising a status detection device for a contactor in any of the traction converters as described above.
The specific embodiments of the traction converter, the state detection device of the contactor thereof, and the apparatus provided in the present application and the state detection method of the contactor in the traction converter described above may be referred to correspondingly, and are not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A method of detecting a condition of a contactor in a traction converter, comprising:
acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact;
if so, determining the real opening and closing state of a main contact of the contactor;
if not, judging that the auxiliary contact of the contactor has a false detection fault.
2. The method of claim 1, further comprising, after said determining the true open and closed state of the main contacts of the contactor:
if the real opening and closing state of the main contact is the same as the theoretical opening and closing state, judging that the working state of the main contact is normal;
and if the real opening and closing state of the main contact is opposite to the theoretical opening and closing state, judging that the main contact breaks down so as to carry out fault protection on the traction converter.
3. The method according to claim 1, wherein after determining that the auxiliary contact of the contactor has the false detection fault, the method further comprises:
obtaining circuit state parameters in the traction converter;
judging whether the change condition of the circuit state parameter is matched with the theoretical opening and closing state of the main contact;
if so, judging that the working state of the main contact is normal;
if not, the main contact is judged to have a fault.
4. The condition sensing method of claim 3 wherein said circuit condition parameters include input current and intermediate DC voltage in said traction converter.
5. The condition detecting method according to claim 4, wherein the contactor is a main contactor connected between the output terminal of the transformer and the input terminal of the rectifying module;
if the theoretical open-close state of the main contact is a closed state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage have rising inflection points or not, and if so, judging that the working state of the main contact is normal; if not, judging that the main contact has a card separation fault;
if the theoretical open-close state of the main contact is an open state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct-current voltage both decrease, if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have a clamping fault.
6. The state detection method according to claim 4, wherein the contactor is a pre-charging contactor having one end connected to the output end of the transformer and the other end connected to the input end of the rectifier module through a charging current-limiting resistor;
if the theoretical open-close state of the main contact is a closed state, the judging whether the change condition of the circuit state parameter is matched with the theoretical open-close state of the main contact comprises the following steps:
judging whether the input current and the intermediate direct current voltage both rise or not, and if so, judging that the working state of the main contact is normal; if not, the main contact is judged to have a card separation fault.
7. A device for detecting the condition of a contactor in a traction converter, comprising:
the acquisition module is used for acquiring the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the judging module is used for judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact; if so, determining the real opening and closing state of a main contact of the contactor; if not, judging that the auxiliary contact of the contactor has a false detection fault.
8. A status detection apparatus for contactors in a traction converter, comprising:
the detection circuit is used for detecting the opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor;
the controller for executing a pre-stored computer program for implementing the steps of the method for detecting the status of contactors in a traction converter as claimed in any one of claims 1 to 6.
9. The state detection apparatus according to claim 8, wherein the detection circuit includes the contactor, a direct-current power source, a first shunt resistor, and a second shunt resistor;
the first end of the normally closed auxiliary contact is connected with the positive electrode of the direct current power supply; the second end of the normally closed auxiliary contact is connected with the negative electrode of the direct-current power supply through the first shunt resistor and is used as a normally closed detection end to be connected with the controller, so that the opening and closing state of the normally closed auxiliary contact can be obtained according to the potential of the normally closed detection end;
the first end of the normally-open auxiliary contact is connected with the positive electrode of the direct-current power supply; and the second end of the normally open auxiliary contact is connected with the negative electrode of the direct-current power supply through the second shunt resistor and is connected with the controller as a normally open detection end so as to obtain the opening and closing state of the normally open auxiliary contact according to the potential of the normally open detection end.
10. A traction converter, characterized in that it comprises a condition detection device of the contactors in the traction converter according to claim 8 or 9.
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| CN201811221343.5A CN111077440A (en) | 2018-10-19 | 2018-10-19 | Traction converter and method, device and equipment for detecting state of contactor of traction converter |
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| CN201811221343.5A CN111077440A (en) | 2018-10-19 | 2018-10-19 | Traction converter and method, device and equipment for detecting state of contactor of traction converter |
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| CN112829794A (en) * | 2021-01-05 | 2021-05-25 | 株洲中车时代电气股份有限公司 | Contactor fault early warning method and related device |
| CN113330323A (en) * | 2020-10-21 | 2021-08-31 | 深圳欣锐科技股份有限公司 | Contactor state detection circuit, system and vehicle |
| CN114047437A (en) * | 2021-11-09 | 2022-02-15 | 中车青岛四方机车车辆股份有限公司 | Contactor state detection method, system and device and railway vehicle |
| CN116890603A (en) * | 2023-09-11 | 2023-10-17 | 新誉集团有限公司 | Failure detection method and system for contactor of air conditioner blower |
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