CN104085310B - A kind of circuit on side of overhead contact line control method based on motor train unit roof ground connection and device - Google Patents
A kind of circuit on side of overhead contact line control method based on motor train unit roof ground connection and device Download PDFInfo
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- CN104085310B CN104085310B CN201410327807.6A CN201410327807A CN104085310B CN 104085310 B CN104085310 B CN 104085310B CN 201410327807 A CN201410327807 A CN 201410327807A CN 104085310 B CN104085310 B CN 104085310B
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Abstract
Circuit on side of overhead contact line control method based on motor train unit roof ground connection provided by the invention, comprising: the current voltage value detecting bow net voltage; Judge whether the current voltage value of the described bow net voltage detected meets pre-conditioned; If the current voltage value of described bow net voltage does not meet pre-conditioned, disconnect vacuum breaker, and after the first Preset Time, closed described vacuum breaker; Judge whether the current voltage value of described bow net voltage in the second preset time period does not meet described pre-conditioned; If do not met, disconnect and lock described vacuum breaker, could close until unlock described vacuum breaker by Operation and Maintenance personnel.Therefore the present invention is not when secondary detection meets pre-conditioned to the current voltage value of bow net voltage, vacuum breaker is disconnected and locks, by Operation and Maintenance, personnel unlock vacuum breaker, and then achieve security risk and hidden danger that teaching process service personnel motor train unit exist roof ground connection.
Description
Technical Field
The invention relates to the field of vehicle detection, in particular to a network side circuit control method and device based on grounding of a motor train unit roof.
Background
A high-voltage network side circuit of an existing motor train unit is shown in fig. 1 and comprises a contact network 1, a pantograph net 2, a primary side voltage transformer 3, a vacuum circuit breaker 4, a lightning arrester 5, an earthing switch 6, a primary side current transformer 7, a main transformer 8, a main converter 9, a traction motor 10, a backflow current transformer 11 and an earthing device 12.
In the actual working process, the primary side of a main transformer 8 in the motor train unit is electrified through a contact net 1, a pantograph 2 and a vacuum circuit breaker 4. The traction winding of the secondary side of the main transformer 8 supplies power to the main converter 9, and the main converter 9 supplies power to the traction motor 10 through alternating current-direct current-alternating current conversion, so that traction and electric braking of the whole train are realized. Meanwhile, the output end of the main transformer 8 is connected with the grounding device 12, so that the working grounding of the train is realized. The primary side voltage transformer 3 detects the voltage value of the primary side pantograph 2, the primary side current transformer 7 detects the current value of the primary side pantograph 2, and the return current transformer 11 detects the secondary side current value, and the current transformers are jointly used for realizing the related protection and control of the whole high-voltage network side circuit.
Generally, the standard voltage of the pantograph 2 is single-phase alternating current 25KV, the voltage of the pantograph 2 fluctuates within a certain range, and the vehicle can still normally operate. If the net voltage of the bow net 2 is lower than the fluctuation range of the high-voltage net side for a certain time, the vacuum circuit breaker 4 is controlled to be switched off, so that the electrical equipment on the vehicle is protected. The method is a low-voltage protection method of a high-voltage network side circuit commonly used by motor train unit vehicles. When the primary side voltage transformer 3 detects that the network voltage of the pantograph 2 returns to the normal fluctuation range, the vacuum circuit breaker 4 is controlled to be closed, and the normal running state of the vehicle is recovered.
However, the applicant has found that if some equipment, such as the roof of a motor train unit, is exposed to the air, a grounding situation may occur during operation of the motor train unit, which constitutes a problem of grounding of the roof, then the net pressure of the pantograph 2 may fall below the normal range, while after a certain distance, some equipment of the roof is not grounded, and the net pressure of the pantograph 2 returns to the normal range. And if only adopt prior art when the net pressure of bow net 2 is lower than normal scope, disconnection vacuum circuit breaker 4, when the net pressure of bow net 2 resumes normal scope, the mode of closing vacuum circuit breaker 4, it is obvious that operation and maintenance personnel can't know the problem of roof ground connection, and the behavior of EMUs has very big safety risk and hidden danger.
Disclosure of Invention
In view of the above, the invention provides a grid-side circuit control method and device based on roof grounding of a motor train unit, so as to inform operation and maintenance personnel that the motor train unit has safety risks and hidden dangers of roof grounding when the roof of the motor train unit is grounded. The technical scheme is as follows:
based on one aspect of the invention, the invention provides a network side circuit control method based on grounding of a motor train unit roof, which comprises the following steps:
detecting the current voltage value of the pantograph voltage;
judging whether the detected current voltage value of the pantograph voltage meets a preset condition or not;
if the current voltage value of the pantograph voltage does not meet the preset condition, disconnecting the vacuum circuit breaker, and closing the vacuum circuit breaker after first preset time;
judging whether the current voltage value of the pantograph voltage does not meet the preset condition within a second preset time period;
if not, the vacuum circuit breaker is opened and locked until the vacuum circuit breaker is unlocked by an operation and maintenance person and can not be closed.
Preferably, the preset condition includes a fixed preset value or a preset range of values.
Preferably, when the preset condition is the fixed preset value, the step of determining that the current voltage value of the pantograph voltage does not satisfy the preset condition includes:
the current voltage value of the pantograph voltage is smaller than the fixed preset value;
when the preset condition is that the preset range value is within the range, the current voltage value of the pantograph voltage does not meet the preset condition, and the preset condition comprises the following steps:
and the current voltage value of the pantograph voltage is smaller than the minimum value in the preset range value.
Preferably, the first preset time is 2min, and the second preset time is 30 min.
Preferably, the method further comprises the following steps:
and alarming after the vacuum circuit breaker is opened and locked.
According to another aspect of the present invention, the present invention provides a grid-side circuit control device based on grounding of a motor train unit roof, comprising:
the detection unit is used for detecting the current voltage value of the pantograph voltage;
the judging unit is used for judging whether the current voltage value of the pantograph voltage detected by the detecting unit meets a preset condition or not;
the control unit is used for switching off the vacuum circuit breaker when the judging unit judges that the current voltage value of the pantograph voltage does not meet the preset condition, and switching on the vacuum circuit breaker after first preset time;
the judging unit is further configured to judge whether the current voltage value of the pantograph voltage does not satisfy the preset condition within a second preset time period;
the control unit is further used for judging that the current voltage value of the pantograph voltage does not meet the preset condition within a second preset time period by the judging unit, disconnecting and locking the vacuum circuit breaker until the vacuum circuit breaker can be closed after being unlocked by operation and maintenance personnel.
Preferably, the preset condition includes a fixed preset value or a preset range of values.
Preferably, when the preset condition is the fixed preset value, the step of determining that the current voltage value of the pantograph voltage does not satisfy the preset condition includes:
the current voltage value of the pantograph voltage is smaller than the fixed preset value;
when the preset condition is that the preset range value is within the range, the current voltage value of the pantograph voltage does not meet the preset condition, and the preset condition comprises the following steps:
and the current voltage value of the pantograph voltage is smaller than the minimum value in the preset range value.
Preferably, the first preset time is 2min, and the second preset time is 30 min.
Preferably, the method further comprises the following steps:
and the alarm unit is used for giving an alarm under the control of the control unit after the vacuum circuit breaker is disconnected and locked.
By applying the technical scheme, the vacuum circuit breaker is disconnected when the current voltage value of the detected pantograph voltage is judged not to meet the preset condition, and the vacuum circuit breaker is closed after the first preset time. Further, the method can continuously judge whether the current voltage value of the pantograph voltage does not meet the preset condition again within a second preset time period, and when the current voltage value of the pantograph voltage does not meet the preset condition again within the second preset time period, the vacuum circuit breaker is disconnected and locked until the vacuum circuit breaker can be closed after the operation and maintenance personnel unlock the vacuum circuit breaker. According to the invention, whether the current voltage value of the pantograph voltage does not meet the preset condition is judged by presetting the second preset time and adopting a secondary judgment mode, and when the current voltage value does not meet the preset condition, the current motor train unit is indicated to possibly have the condition of roof grounding, so that the vacuum circuit breaker is disconnected and locked, and the vacuum circuit breaker is unlocked by operation and maintenance personnel, thereby informing the operation and maintenance personnel of the safety risk and hidden danger of roof grounding of the motor train unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a high-voltage network side circuit connection of a motor train unit in the prior art;
FIG. 2 is a flow chart of a network side circuit control method based on grounding of a motor train unit roof according to the present invention;
FIG. 3 is another flow chart of a grid-side circuit control method based on grounding of a motor train unit roof according to the present invention;
fig. 4 is a schematic structural diagram of a grid-side circuit control device based on grounding of a motor train unit roof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The following embodiments of the present invention are illustrated in fig. 1 as examples.
One embodiment
Referring to fig. 2, a flowchart of a network-side circuit control method based on the grounding of the top of the motor train unit provided by the invention is shown, and the method includes:
step 101, detecting a current voltage value of the pantograph voltage.
Specifically, in the present embodiment, the current voltage value of the primary pantograph 2 is detected in real time for the primary voltage transformer 3.
And 102, judging whether the detected current voltage value of the pantograph voltage meets a preset condition or not. If not, step 103 is executed, and if not, step 101 is executed.
In this embodiment, the preset condition may include a fixed preset value or a preset range of values. The current voltage value of the pantograph voltage not meeting the preset condition may include that the current voltage value of the pantograph voltage is smaller than a fixed preset value, or that the current voltage value of the pantograph voltage is smaller than a minimum value in a preset range of values.
In the practical application process, under the normal running state of the motor train unit, the standard voltage of the pantograph 2 is 25KV of single-phase alternating current, and the normal fluctuation range of the pantograph 2 is 16.5 KV-29 KV. Therefore, the preset condition in the present invention may include a fixed preset value, such as 25KV, or a preset range of values, such as 16.5KV to 29 KV. When the detected current voltage value of the pantograph voltage is 25KV or within the normal fluctuation range of 16.5 KV-29 KV, the voltage of the pantograph 2 is normal. Continuing to return to the step 101, detecting the current voltage value of the pantograph voltage in real time.
And when the detected current voltage value of the pantograph network voltage is less than 25KV or less than the minimum value 16.5KV in the normal fluctuation range of 16.5 KV-29 KV, indicating that the current voltage of the pantograph network 2 is abnormal, and executing step 103.
And 103, opening the vacuum circuit breaker, and closing the vacuum circuit breaker after the first preset time.
In this embodiment, when detecting that the current voltage value of the pantograph voltage does not satisfy the preset condition, the vacuum circuit breaker is opened, and after a first preset time, the vacuum circuit breaker is re-closed. Preferably, the first preset time may be 2 min.
And 104, judging whether the current voltage value of the pantograph voltage does not meet the preset condition within a second preset time period. If not, executing step 105, and if not, returning to executing step 101.
In this embodiment, when it is detected that the current voltage value of the pantograph voltage does not satisfy the preset condition for the first time, and after the first opening and reclosing actions of the vacuum circuit breaker are completed, it is continuously determined whether the current voltage value of the pantograph voltage does not satisfy the preset condition again within the second preset time period. Preferably, the second predetermined time may be 30 min.
It should be noted that the second preset time period may be a second preset time period in which the timing is started after the vacuum circuit breaker is reclosed, or may be a time period in which the start time of the second preset time period is equal to the start time of the first preset time, that is, a time period from when the vacuum circuit breaker is first opened, where the first preset time is included in the second preset time period.
Step 105, the vacuum circuit breaker is opened and locked until the vacuum circuit breaker is unlocked by the operation and maintenance personnel and can not be closed.
In this embodiment, the vacuum circuit breaker is locked, which means that the vacuum circuit breaker cannot be automatically closed by the system, and must be unlocked by an operation and maintenance person before the vacuum circuit breaker can be closed again.
The inventors now further illustrate the present invention by way of example in order to more visually describe the technical solution of the present invention. At this time, the first preset time is assumed to be 2min, the second preset time is assumed to be 30min, and the preset condition is 16.5 KV-29 KV.
In the invention, when the current voltage value of the pantograph voltage is detected to be less than the minimum value 16.5KV of 16.5 KV-29 KV, the vacuum circuit breaker is disconnected for 2min, and the vacuum circuit breaker is closed again after 2 min. Meanwhile, timing is started by taking the current time for reclosing the vacuum circuit breaker as the starting time of 30min of a second preset time period, and whether the current voltage value of the pantograph voltage is smaller than 16.5KV again in the following 30min is further judged. And when the current voltage value of the pantograph voltage is smaller than 16.5KV again within the subsequent 30min, indicating that the current motor train unit is likely to have the roof grounding condition, disconnecting and locking the vacuum circuit breaker until the vacuum circuit breaker is unlocked by operation and maintenance personnel and can not be closed.
By applying the technical scheme, the vacuum circuit breaker is disconnected when the current voltage value of the detected pantograph voltage is judged not to meet the preset condition, and the vacuum circuit breaker is closed after the first preset time. Further, the method can continuously judge whether the current voltage value of the pantograph voltage does not meet the preset condition again within the second preset time, and when the current voltage value of the pantograph voltage does not meet the preset condition again within the second preset time, the vacuum circuit breaker is disconnected and locked until the vacuum circuit breaker can be closed after the operation and maintenance personnel unlock the vacuum circuit breaker. According to the invention, whether the current voltage value of the pantograph voltage does not meet the preset condition is judged by presetting the second preset time and adopting a secondary judgment mode, and when the current voltage value does not meet the preset condition, the current motor train unit is indicated to possibly have the condition of roof grounding, so that the vacuum circuit breaker is disconnected and locked, and the vacuum circuit breaker is unlocked by operation and maintenance personnel, thereby informing the operation and maintenance personnel of the safety risk and hidden danger of roof grounding of the motor train unit.
Preferably, on the basis of the above embodiment, please refer to fig. 3, which shows another flowchart of a network side circuit control method based on the grounding of the top of the motor train unit according to the present invention, further comprising:
and step 106, alarming after the vacuum circuit breaker is disconnected and locked.
In this embodiment, the alarm manner may include a ring alarm and/or a vibration alarm.
The invention alarms after the vacuum circuit breaker is disconnected and locked, and informs operation and maintenance personnel to check and maintain the motor train unit in time, so that potential safety hazards existing in the motor train unit can be found in time, and the running safety of the motor train unit is ensured.
Another embodiment
On the basis of the above embodiment, the present invention further provides a schematic structural diagram of a grid-side circuit control device based on grounding of a roof of a motor train unit, please refer to fig. 4, which includes: a detection unit 100, a judgment unit 200 and a control unit 300. Wherein,
the detection unit 100 is used for detecting the current voltage value of the pantograph voltage.
A judging unit 200, configured to judge whether the current voltage value of the pantograph voltage detected by the detecting unit 100 meets a preset condition.
The preset condition may include a fixed preset value or a preset range of values. The current voltage value of the pantograph voltage not meeting the preset condition may include that the current voltage value of the pantograph voltage is smaller than a fixed preset value, or that the current voltage value of the pantograph voltage is smaller than a minimum value in a preset range of values.
The control unit 300 is configured to disconnect the vacuum circuit breaker for a first preset time when the determination unit 200 determines that the current voltage value of the pantograph voltage does not satisfy the preset condition, and close the vacuum circuit breaker after the first preset time.
Preferably, the first preset time may be 2 min.
The determining unit 200 is further configured to determine whether the current voltage value of the pantograph voltage does not satisfy the preset condition within a second preset time period.
Preferably, the second predetermined time may be 30 min.
The control unit 300 is further configured to, when the determining unit 200 determines that the current voltage value of the pantograph voltage does not satisfy the preset condition again within the second preset time period, disconnect and lock the vacuum circuit breaker until the vacuum circuit breaker is unlocked by the operation and maintenance staff and can not be closed.
Preferably, an alarm unit 400 for alarming under the control of the control unit 300 after the vacuum circuit breaker is opened and locked may be further included.
The alarm mode can comprise a ringing alarm and/or a vibration alarm.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 method and the device for controlling the network side circuit based on the grounding of the top of the motor train unit are described in detail, specific examples are applied in the method for explaining the principle and the implementation mode of the method, and the description of the embodiments is only used for helping to understand the method and the core idea of the method; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A network side circuit control method based on grounding of a motor train unit roof is characterized by comprising the following steps:
detecting the current voltage value of the pantograph voltage;
judging whether the detected current voltage value of the pantograph voltage meets a preset condition or not;
if the current voltage value of the pantograph voltage does not meet the preset condition, disconnecting the vacuum circuit breaker, and closing the vacuum circuit breaker after first preset time;
judging whether the current voltage value of the pantograph voltage does not meet the preset condition within second preset time;
if not, the vacuum circuit breaker is opened and locked until the vacuum circuit breaker is unlocked by an operation and maintenance person and can not be closed.
2. The method of claim 1, wherein the predetermined condition comprises a fixed predetermined value or a predetermined range of values.
3. The method of claim 2, wherein when the preset condition is the fixed preset value, the current voltage value of the pantograph voltage not meeting the preset condition comprises:
the current voltage value of the pantograph voltage is smaller than the fixed preset value;
when the preset condition is that the preset range value is within the range, the current voltage value of the pantograph voltage does not meet the preset condition, and the preset condition comprises the following steps:
and the current voltage value of the pantograph voltage is smaller than the minimum value in the preset range value.
4. The method according to any one of claims 1 to 3, wherein the first predetermined time is 2min and the second predetermined time is 30 min.
5. The method of claim 1, further comprising:
and alarming after the vacuum circuit breaker is opened and locked.
6. The utility model provides a net side circuit control device based on EMUs roof ground connection which characterized in that includes:
the detection unit is used for detecting the current voltage value of the pantograph voltage;
the judging unit is used for judging whether the current voltage value of the pantograph voltage detected by the detecting unit meets a preset condition or not;
the control unit is used for switching off the vacuum circuit breaker when the judging unit judges that the current voltage value of the pantograph voltage does not meet the preset condition, and switching on the vacuum circuit breaker after first preset time;
the judging unit is further used for judging whether the current voltage value of the pantograph voltage does not meet the preset condition within a second preset time;
the control unit is further used for judging that the current voltage value of the pantograph voltage does not meet the preset condition within second preset time by the judging unit, disconnecting and locking the vacuum circuit breaker until the vacuum circuit breaker can be closed after being unlocked by operation and maintenance personnel.
7. The apparatus of claim 6, wherein the predetermined condition comprises a fixed predetermined value or a predetermined range of values.
8. The apparatus of claim 7, wherein when the preset condition is the fixed preset value, the current voltage value of the pantograph voltage not meeting the preset condition comprises:
the current voltage value of the pantograph voltage is smaller than the fixed preset value;
when the preset condition is that the preset range value is within the range, the current voltage value of the pantograph voltage does not meet the preset condition, and the preset condition comprises the following steps:
and the current voltage value of the pantograph voltage is smaller than the minimum value in the preset range value.
9. The device according to any one of claims 6 to 8, wherein the first predetermined time is 2min and the second predetermined time is 30 min.
10. The apparatus of claim 6, further comprising:
and the alarm unit is used for giving an alarm under the control of the control unit after the vacuum circuit breaker is disconnected and locked.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410327807.6A CN104085310B (en) | 2014-07-10 | 2014-07-10 | A kind of circuit on side of overhead contact line control method based on motor train unit roof ground connection and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410327807.6A CN104085310B (en) | 2014-07-10 | 2014-07-10 | A kind of circuit on side of overhead contact line control method based on motor train unit roof ground connection and device |
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| CN104085310A CN104085310A (en) | 2014-10-08 |
| CN104085310B true CN104085310B (en) | 2016-03-02 |
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| CN107526013A (en) * | 2017-10-17 | 2017-12-29 | 中车株洲电力机车有限公司 | Control method, device and the medium of a kind of high-voltage isulation detection of locomotive |
| CN111890990A (en) * | 2020-08-12 | 2020-11-06 | 中车大连机车车辆有限公司 | A kind of electric locomotive pantograph net protection control method and system |
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| CN102424004A (en) * | 2011-10-24 | 2012-04-25 | 南车株洲电力机车有限公司 | Motor train unit network side circuit and control method thereof |
| CN202512200U (en) * | 2012-03-06 | 2012-10-31 | 南车株洲电力机车有限公司 | Electric locomotive network side high voltage circuit insulation detection system |
| CN103558502A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Single-phase earth fault detection circuit, method and system |
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| JPH0970101A (en) * | 1995-08-31 | 1997-03-11 | Hitachi Ltd | Monitor device for ground protection for vehicles |
| EP1336528A2 (en) * | 2002-02-19 | 2003-08-20 | Bae Systems Controls, Inc. | Ground fault detection system and method |
| JP2011166961A (en) * | 2010-02-10 | 2011-08-25 | Toshiba Corp | Ac electric-train |
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