CN113238124B - Alternating current insulation detection system and method and railway vehicle - Google Patents
Alternating current insulation detection system and method and railway vehicle Download PDFInfo
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- CN113238124B CN113238124B CN202110336491.7A CN202110336491A CN113238124B CN 113238124 B CN113238124 B CN 113238124B CN 202110336491 A CN202110336491 A CN 202110336491A CN 113238124 B CN113238124 B CN 113238124B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
Abstract
The invention provides an alternating current insulation detection system, an alternating current insulation detection method and a rail vehicle, wherein the alternating current insulation detection system comprises: the device comprises an alternating current insulation detection device, a current transformer and a relay; the first end of the alternating current insulation detection device is connected with the N line of the front half power supply line through a current transformer; the second end of the alternating current insulation detection device is connected with a first three-phase line of the front half power supply line through a normally closed contact of the relay; the first three-phase line is one of the three-phase lines; a branch circuit at the second end of the alternating current insulation detection device is connected with a first three-phase line of a rear half section power supply circuit through a normally open contact of the relay; the alternating current insulation detection device is used for acquiring alternating current signals acquired by the current transformer, realizing the diagnosis of poor insulation faults and controlling the relay according to the diagnosis result; the front half power supply line and the rear half power supply line are communicated and disconnected under the control of the power line disconnection device. And detecting the insulation performance of the alternating current bus in real time.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to an alternating current insulation detection system and method and a rail vehicle.
Background
In the high-speed running process of a railway vehicle, an alternating current power supply line and a load on the vehicle are inevitably worn, so that the insulating property is changed, and once the insulation is damaged, a short circuit is generated, so that electric leakage is caused. When the electric leakage exceeds a certain range, the related electric equipment can be burnt, the normal operation of the vehicle is influenced, even a fire disaster occurs, and potential safety hazards are brought to passengers and the vehicle.
In the running process of the rail vehicle, workers cannot effectively perform insulation detection on the rail vehicle, and in the running process of the vehicle, the electric load and the line cannot be replaced or repaired in time well. Therefore, in order to ensure the continuous and reliable running of the vehicle, the vehicle needs to be subjected to insulation detection frequently, so that the insulated damaged cable or electric equipment can be found and maintained in time.
At present, the existing insulation detection method only uses a group of alternating current insulation detection devices, and the detection and positioning of the poor insulation performance of the whole vehicle cannot be realized. Although the method using two sets of alternating current detection devices can realize fault location, only one set of alternating current detection device works when the rail vehicle normally runs due to the two sets of alternating current detection devices, so that the manufacturing cost of the rail vehicle is high, and resources are wasted.
Therefore, it is an urgent need to provide an ac insulation detection system, method and rail vehicle, which can detect the insulation performance of the entire rail vehicle in real time, precisely locate a fault to a certain power unit when the ac insulation of the rail vehicle is poor, and detect the ac bus insulation performance of a non-fault unit in real time after isolating the fault unit, thereby improving the operation efficiency of the rail vehicle and reducing the manufacturing cost of the rail vehicle.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an alternating current insulation detection system and method and a railway vehicle.
In a first aspect, the present invention provides an ac insulation detection system, comprising: the device comprises an alternating current insulation detection device, a current transformer and a relay;
the first end of the alternating current insulation detection device is connected with the N line of the first half power supply line through the current transformer;
the second end of the alternating current insulation detection device is connected with a first three-phase line of a first half power supply line through a normally closed contact of the relay; the first three-phase line is one of the three-phase lines;
a branch circuit at the second end of the alternating current insulation detection device is connected with the first three-phase line of the rear half-section power supply circuit through a normally open contact of the relay;
the alternating current insulation detection device is used for acquiring alternating current signals acquired by the current transformer, realizing the diagnosis of poor insulation faults and controlling the relay according to the diagnosis result;
the front half power supply line and the rear half power supply line are communicated and disconnected under the control of a power line disconnecting device.
In a second aspect, the present invention further provides an ac insulation detection method implemented based on the ac insulation detection system, including:
collecting an alternating current signal;
judging that the alternating current signal is greater than a preset threshold value;
and determining that the fault of poor insulation exists.
According to the alternating current insulation detection method provided by the invention,
after the step of determining that the poor insulation fault exists, the method further comprises the following steps:
and disconnecting the first half power supply line and the second half power supply line.
According to the method for detecting the alternating current insulation provided by the invention,
after the step of disconnecting the first half section of power supply line and the second half section of power supply line, the method further comprises the following steps:
starting the first half-row auxiliary inverter, and judging whether the insulation fault disappears or not according to the collected alternating current signal;
if the poor insulation fault disappears, judging that the poor insulation fault occurs in the second half section of the power supply line;
and if the poor insulation fault does not disappear, judging that the poor insulation fault occurs in the first half section of the power supply line.
According to the alternating current insulation detection method provided by the invention,
the judging that the fault with poor insulation occurs after the step of the second half section of the power supply line further comprises the following steps:
and the normally closed contact of the relay keeps a closed state, and the normally open contact keeps an open state, so that the first half section of the power supply line is kept to provide operation power.
According to the alternating current insulation detection method provided by the invention,
the step of judging that the poor insulation fault occurs after the first half section of power supply line further comprises the following steps:
isolating the first half row of auxiliary inverters, and starting the second half row of auxiliary inverters;
and the normally closed contact of the relay is opened, the normally open contact is closed, and the second half-section power supply line is switched to provide operation power.
In a third aspect, the invention further provides a rail vehicle, and the rail vehicle is provided with the alternating current insulation detection system.
In a fourth aspect, the present invention further provides an electronic device, including a memory and a processor, where the processor and the memory complete communication with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the various steps of the ac insulation detection method as described above.
In a fifth aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, which computer program, when executed by a processor, implements the steps of the ac insulation detection method as described above.
According to the alternating current insulation detection system, the alternating current insulation detection method and the rail vehicle, the relay is arranged, so that one end of the alternating current insulation detection device is respectively connected with the front half power supply line and the rear half power supply line through the normally closed contact and the normally open contact of the relay, the insulation performance of the whole rail vehicle is detected in real time, when the alternating current insulation of the rail vehicle is poor, a fault is accurately positioned to a certain power unit, and meanwhile, after the fault unit is isolated, the insulation performance of an alternating current bus of a non-fault unit is detected in real time, so that the operation efficiency of the rail vehicle is improved, and meanwhile, the manufacturing cost of the rail vehicle is reduced.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a block diagram of an AC insulation detection system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an AC insulation detection system provided in the prior art;
FIG. 3 is a second block diagram of an AC insulation detection system provided in the prior art;
FIG. 4 is a flow chart of an AC insulation detection method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a rail transit system according to an embodiment of the present invention;
fig. 6 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Reference numerals:
11: an alternating current insulation detection device; 12: a current transformer;
13: normally closed contacts of the relay; 14: a normally open contact of the relay;
15: provided is a power line breaking device.
21: a first AC insulation detection device; 22: a first current transformer;
23: a first power line breaking device.
31: a second AC insulation detection device; 31': a third ac insulation detection device;
32: a second current transformer; 32': a third current transformer;
33: a first switch; 33': a second switch;
34: and a second power line breaking device.
41: a first power unit; 41': a second power unit;
42: a train network control system; 43: a network display screen;
44: a power supply conversion device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 traction converter is one of key parts of the railway vehicle, is arranged at the bottom of the railway vehicle, and has the main functions of converting electric energy between a direct current system and an alternating current system, converting direct current from a contact network into three-phase alternating current (a three-phase four-wire system U, V, W, N), and realizing starting, braking and speed regulation control of an alternating current traction motor through voltage regulation and frequency regulation control.
When the single-phase live wire U, V, W is poorly insulated from the car body, it may cause the burning loss of the related electric equipment, and bring safety hazards to passengers and vehicles. Therefore, it is important to detect U, V, W the insulation performance of the rail vehicle relative to the vehicle body in real time. At present, the rail vehicles have the following two alternating current insulation detection schemes:
firstly, fig. 2 is one of the structural diagrams of the ac insulation detection system provided by the prior art, as shown in fig. 2, 1 group of ac insulation detection devices (first ac insulation detection devices 21) is installed on only the first half of the whole train of the rail vehicle, the first ac insulation detection devices 21 are powered by the U-phase of the three-phase power supply, the first current transformer 22 collects the ac current on the N-line, and the first power line breaking device 23 can realize the penetration and breaking of the first half of the train and the second half of the train U, V, W three-phase ac bus.
When the insulation of the alternating-current bus to the vehicle body is poor, the first power line breaking device 23 is disconnected. Starting the first half-row auxiliary inverter, and if the fault disappears, maintaining the power operation of the first half-row; if the fault still exists, the auxiliary inverter of the first half row is isolated, the auxiliary inverter of the second half row is started, and the power operation of the second half row is maintained.
The disadvantages are that: when the alternating current bus has electric leakage, if a fault point appears in the front half row, the operation of the rear half row power vehicle is maintained, the whole vehicle has no alternating current insulation detection function, and when the single-phase live wire U, V, W has poor insulation on the vehicle body, the burning loss of related electric equipment can be caused, and potential safety hazards are brought to passengers and vehicles.
Secondly, fig. 3 is a second structure diagram of an ac insulation detecting system provided by the prior art, as shown in fig. 3, 2 groups of ac insulation detecting devices (a second ac insulation detecting device 31 and a third ac insulation detecting device 31') are installed on all the rows of the rail vehicle, and 2 groups of ac insulation detecting devices are all powered by U phase, and the power line breaking device can realize the penetration and breaking of the three-phase ac bus of the first half row U, V, W and the second half row U1, V2 and W1.
The second current transformer 32 and the third current transformer 32 'can collect alternating current on the N lines, and under normal conditions, one group of alternating current insulation detection devices is started, and the other group of alternating current insulation detection devices is standby (corresponding to the disconnection of the first switch 33 or the second switch 33' connected with the N lines, no current detection exists);
when the poor insulation of the alternating-current bus to the train body is detected, the power line breaking device 34 is disconnected, the switch connected with the N line by the standby alternating-current insulation detection device is normally opened and normally closed, the two devices are started simultaneously, and after a half train with a fault is detected, the auxiliary inverter of the fault unit is isolated, and the half-power operation is maintained.
The disadvantages are as follows: the whole train is provided with 2 groups of alternating current insulation detection devices, and when the train normally runs and breaks down to maintain half-train running, one group of alternating current insulation detection devices are in a non-working state under the two working conditions, so that the manufacturing cost is increased and the current train resources are wasted.
In order to overcome the defects in the prior art, the invention provides an alternating current insulation detection system and method and a railway vehicle.
Fig. 1 is a structural diagram of an ac insulation detection system according to an embodiment of the present invention, and as shown in fig. 1, the ac insulation detection system includes: the system comprises an alternating current insulation detection device 11, a current transformer 12 and a relay;
the first end of the alternating current insulation detection device 11 is connected with the N line of the first half power supply line through the current transformer 12;
the second end of the alternating current insulation detection device 11 is connected with a first three-phase line of a first half power supply line through a normally closed contact 13 of the relay; the first three-phase line is one of the three-phase lines;
a branch circuit at the second end of the alternating current insulation detection device 11 is connected with the first three-phase line of a rear half-section power supply circuit through a normally open contact 14 of the relay;
the alternating current insulation detection device 11 is used for acquiring alternating current signals acquired by the current transformer 12, realizing the diagnosis of poor insulation faults and controlling the relay according to the diagnosis result;
the front half power supply line and the rear half power supply line are communicated and disconnected under the control of a power line disconnecting device 15.
Specifically, three live wires (U, V, W in fig. 1, and corresponding U1, V2 and W3) in three-phase alternating current (three-phase four-wire system U, V, W, N) are communicated with each other through loads, in order to prevent a three-phase short circuit and a fault of a vehicle insulation fault lamp from causing a huge influence on a vehicle structure and special requirements on power supply in the running process of a railway vehicle, a power wire breaking device 15 is arranged on the three-phase live wires, and under the requirement, the three live wires can be broken by the power wire breaking device 15, a power supply line is divided into a first half power supply line (including U, V, W) and a second half power supply line (including U1, V2 and W3), and the power wire breaking device 15 controls the penetration and breaking of the first half power supply line and the second half power supply line.
In general, two pantographs are provided in the railway vehicle, and when the vehicle is running, a single pantograph current collection mode is adopted, and the other pantograph is in standby. In the embodiment of the invention, the first half power supply line is a half control line close to the raised pantograph end side, the second half power supply line is a half control line far away from the raised pantograph end side, and after the pantograph is replaced, the first half power supply line and the second half power supply line are correspondingly adjusted.
In addition, the power line breaking device 15 capable of realizing the penetration and the breaking of the power supply line comprises an alternating current contactor, a thyristor, a relay, a frequency converter and the like, and the specifically used power line breaking device 15 can be selected according to actual conditions, which is not limited in this embodiment.
And the first end of the alternating current insulation detection device 11 is connected with the N line of the first half power supply line through the current transformer 12. One end of the current transformer 12 is connected with the N line, the other end of the current transformer is connected with the insulation detection device, alternating current signals on the N line are collected, and the collected alternating current signals are sent to the insulation detection device. The alternating current insulation detection device 11 is used for acquiring alternating current signals acquired by the current transformer 12, realizing the diagnosis of the fault with poor insulation, and controlling the relay according to the diagnosis result.
The second end of the alternating current insulation detection device 11 is connected with a first three-phase line (U line) of the first half power supply line through a normally closed contact 13 of the relay. The first three-phase line is one of the three-phase lines. It should be noted that, in this embodiment, one end of the ac insulation detecting device 11 may be connected to a U line, or may be connected to a V line or a W line.
The branch of the second end of the ac insulation detection device 11 is connected to the first three-phase line of the second half-stage power supply line (line U1) through the normally open contact 14 of the relay.
Through the relay, the selection that the second end of the alternating current insulation detection device 11 is connected to the first half power supply line or the second half power supply line can be controlled. Only one alternating current insulation detection device 11 is used, the detection of the insulation fault of the whole vehicle can be effectively realized, and the insulation fault area can be positioned in the front half column or the rear half column.
It should be noted that, the three-phase power can be connected by a delta or star connection method at the power end and the load end, which can be specifically selected according to actual needs, and this embodiment does not limit this.
According to the alternating current insulation detection system provided by the invention, the relay is arranged, so that one end of the alternating current insulation detection device 11 is respectively connected with the front half power supply line and the rear half power supply line through the normally closed contact 13 and the normally open contact 14 of the relay, the real-time detection of the insulation performance of the whole railway vehicle is realized, when the alternating current insulation of the railway vehicle is poor, a fault is accurately positioned to a certain power unit, and meanwhile, after the fault unit is isolated, the insulation performance of the alternating current bus of a non-fault unit is detected in real time, so that the operation efficiency of the railway vehicle is improved, and the manufacturing cost of the railway vehicle is reduced.
Fig. 4 is a flowchart of an ac insulation detection method according to an embodiment of the present invention, and as shown in fig. 4, an embodiment of the present invention provides an ac insulation detection method implemented based on the ac insulation detection system, including:
step S1, collecting an alternating current signal;
step S2, judging that the alternating current signal is larger than a preset threshold value;
in step S3, it is determined that a bad insulation fault exists.
Specifically, in step S1, the current transformer 12 collects an ac signal and transmits the collected ac signal to the insulation detection device.
In step S2, the ac insulation detection device 11 is configured to obtain the ac current signal collected by the current transformer 12, compare the obtained ac current signal with a preset threshold, and determine whether the obtained ac current signal is greater than the preset threshold.
In step S3, if the ac insulation detection device 11 determines that the obtained ac current signal is greater than the preset threshold, it is determined that the rail vehicle has an insulation failure fault, and the diagnosis of the insulation failure fault is implemented.
It should be noted that the preset threshold for determining whether there is a poor insulation fault is not a fixed value, and may be set according to specific requirements. Furthermore, in order to detect the detection value in the insulation detection device in real time, the upper computer can be connected through a serial interface on the basis of the insulation detection device, and the adjustment of the preset threshold value and the real-time observation of the detection value are realized.
The relay is further controlled, the fault of poor insulation is positioned to appear in the front half row or the rear half row through the change of the state of the normally open and normally closed contact 13 of the relay, and the fault of poor insulation is positioned only through one insulation detection device.
The alternating current insulation detection method provided by the invention realizes real-time detection of the insulation performance of the whole rail vehicle, and when the alternating current insulation of the rail vehicle is poor, the insulation performance of the alternating current bus of the non-fault unit is detected in real time, so that the operation efficiency of the rail vehicle is improved, and the manufacturing cost of the rail vehicle is reduced.
Based on the above embodiments, optionally, in the ac insulation detection method,
after the step of determining that the poor insulation fault exists, the method further comprises the following steps:
and disconnecting the first half power supply line and the second half power supply line.
Specifically, in a normal running state of the railway vehicle, the power line breaking device 15 is in a closed state, and a front half power supply line is communicated with a rear half power supply line. The AC insulation detection device 11 is powered by the U phase of the first half power supply line through the normally closed contact 13 of the relay.
After it is determined that there is a failure of poor insulation by the alternating current signal collected by the current transformer 12, the first half power supply line and the second half power supply line are disconnected by using the power line breaking device 15.
On the basis of the above embodiment, according to the embodiment of the invention, through the power line breaking device 15, when the fault of poor insulation of the vehicle is detected, the first half power supply line and the second half power supply line are cut off in time, so that the fault unit is isolated in time, the serious safety consequence caused by the poor insulation of the vehicle is avoided, the damage of the vehicle equipment is avoided, and the safety of the train is improved.
Based on the above embodiments, optionally, in the ac insulation detection method,
after the step of disconnecting the first half section of power supply line and the second half section of power supply line, the method further comprises the following steps:
starting the first half-row auxiliary inverter, and judging whether the insulation fault disappears or not according to the collected alternating current signal;
if the poor insulation fault disappears, judging that the poor insulation fault occurs in the second half section of the power supply line;
and if the poor insulation fault does not disappear, judging that the poor insulation fault occurs in the first half section of the power supply line.
Specifically, the power supply system for the railway vehicle further comprises a front half-row auxiliary inverter and a rear half-section auxiliary inverter.
After it is determined that there is an insulation fault that disconnects the first half power supply line and the second half power supply line, it is necessary to further determine whether the region where the insulation fault occurs is the first half or the second half of the rail vehicle.
Firstly, starting the first half-row auxiliary inverter, comparing the magnitude relation between the collected alternating current signal and a preset threshold value according to the collected alternating current signal, and judging whether the insulation failure fault disappears.
If the collected alternating current signal is not larger than the preset threshold value, the poor insulation fault is judged to disappear, and the situation that the poor insulation fault occurs in the second half section of the power supply line is determined.
If the collected alternating current signal is larger than a preset threshold value, the poor insulation fault is judged not to disappear, and the poor insulation fault is determined to be generated in the first half section of the power supply line under the condition.
Further, according to the position of the poor insulation fault, the related equipment of the rail vehicle is overhauled and replaced.
On the basis of the above embodiment, in the embodiment of the invention, after the front half-row auxiliary inverter is started, whether the poor insulation fault disappears or not is determined, the fault is accurately positioned to a certain power unit (the front half row or the rear half row of the rail vehicle), and meanwhile, after the fault unit is isolated, the alternating current bus insulation performance of the non-fault unit can still be continuously detected in real time, so that the operation efficiency of the rail vehicle is improved, and the manufacturing cost of the rail vehicle is reduced.
Based on the above embodiments, optionally, in the ac insulation detection method,
the step of judging that the fault with poor insulation occurs in the second half section of the power supply line further comprises the following steps:
the normally closed contact 13 of the relay keeps a closed state, and the normally open contact 14 keeps an open state, so that the first half power supply line is kept to provide operation power.
Specifically, after the poor insulation fault is judged to occur in the second half of the power supply line, the normally closed contact 13 of the relay is controlled to be kept in a closed state, the normally open contact 14 is kept in an open state, and the first half of the power supply line is kept to provide operation power.
Based on the above embodiments, optionally, in the alternating current insulation detection method,
the step of judging that the poor insulation fault occurs after the first half section of power supply line further comprises the following steps:
isolating the first half row of auxiliary inverters, and starting the second half row of auxiliary inverters;
and the normally closed contact 13 of the relay is opened, the normally open contact 14 is closed, and the second half-section power supply line is switched to provide operation power.
Specifically, after the poor insulation fault is judged to occur in the first half section of power supply line, the first half section of auxiliary inverter is isolated, the second half section of auxiliary inverter is started, the normally closed contact 13 of the relay is controlled to be opened, the normally open contact 14 is controlled to be closed, and the second half section of power supply line is switched to provide operation power.
At this time, the ac insulation detection device 11 is supplied with power from the U1 phase of the latter half of the power supply line through the normally open contact 14 (which is already in the closed state at this time) of the relay. Whether the poor insulation fault occurs again can be monitored in real time in the running process of the vehicle.
On the basis of the above embodiment, in the embodiment of the invention, the relay is arranged, so that one end of the alternating current insulation detection device 11 is respectively connected with the first half power supply line and the second half power supply line through the normally closed contact 13 and the normally open contact 14 of the relay, and is matched with the power line breaking device 15, the first half row auxiliary inverter and the second half auxiliary inverter, so that the insulation performance of the whole rail vehicle is detected in real time.
The embodiment of the invention provides a rail vehicle, and the rail vehicle is provided with the alternating current insulation detection system.
Specifically, the rail vehicle is equipped with the alternating current insulation detection system provided by the embodiment of the invention, and the current transformer 12 in the alternating current insulation detection system collects alternating current signals on the N lines and sends the collected alternating current signals to the insulation detection device. The alternating current insulation detection device 11 is used for acquiring alternating current signals acquired by the current transformer 12, realizing the diagnosis of poor insulation faults and controlling the relay according to the diagnosis result.
The relay enables one end of the alternating current insulation detection device 11 to be respectively connected with a first half power supply line and a second half power supply line through a normally closed contact 13 and a normally open contact 14 of the relay, and the relay is matched with a power line breaking device 15, a first half row auxiliary inverter and a second half row auxiliary inverter, so that the insulation performance of the whole rail vehicle is detected in real time.
When the rail vehicle alternating current insulation is poor, a fault is accurately positioned to a certain power unit, and meanwhile, after the fault unit is isolated, the fact that the vehicle can switch a power supply unit is guaranteed, the vehicle can continue to operate, the alternating current bus insulation performance of a non-fault unit can still be detected in real time, and the manufacturing cost of the rail vehicle is reduced while the operation efficiency of the rail vehicle is improved.
It should be noted that the ac insulation detection system mounted on the rail vehicle is used for executing the ac insulation detection method, and the specific implementation manner thereof is consistent with the method implementation manner, and is not described herein again.
Further, fig. 5 is a schematic structural diagram of a rail transit system according to an embodiment of the present invention, and as shown in fig. 5, the ac insulation detection system according to the embodiment of the present invention is installed on a rail vehicle.
The rail transit System is further provided with an alternating current insulation device connected with a Train network Control System (Train Control and Management System, TCMS for short) 42, and the Train network Control System controls a network display screen 43 to display the insulation fault condition of the rail vehicle detected in real time. When the poor insulation of the alternating current bus to the vehicle body is detected, the network display screen 43 reports the alternating current leakage alarm fault.
The first half row of power supply units are correspondingly connected with a first power unit 41 (a traction motor, an auxiliary power supply system and the like), the second half row of control units are correspondingly connected with a second power unit 41', and a power line breaking device 15 (an alternating current bus contactor is used here) controls the penetration and breaking of the first half section of power supply line and the second half section of power supply line. That is, the power line breaking device 15 and the power supply conversion device 44 (including the relay normally open contact 14 and the relay normally closed contact 13) together control the rail vehicle to provide the vehicle running power by using the first power unit 41 or by using the second power unit 41'.
It should be noted that, the present embodiment is only described as a specific example, and a method for using the ac insulation detection system mounted on the rail vehicle in combination with other functions in the rail transit system is described. In addition, the adjustment can be performed according to the actual situation, which is not limited in this embodiment.
Fig. 6 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, the electronic device may include: a processor (processor)610, a communication interface (communication interface)620, a memory (memory)630 and a communication bus (bus)640, wherein the processor 610, the communication interface 620 and the memory 630 complete communication with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the lightning arrester installation position locating method, which includes: detecting a train main control end and identifying the position of a raised pantograph; collecting an over-current signal and positioning a fault area; and processing the fault according to the fault judgment result.
In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the alternating current insulation detection method provided by the above-mentioned method embodiments, including: collecting an alternating current signal; judging that the alternating current signal is greater than a preset threshold value; and determining that the poor insulation fault exists.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the methods provided in the foregoing embodiments to perform an ac insulation detection method, where the method includes: collecting an alternating current signal; judging that the alternating current signal is greater than a preset threshold value; and determining that the poor insulation fault exists.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An alternating current insulation detection system, comprising: the device comprises an alternating current insulation detection device (11), a current transformer (12) and a relay;
the first end of the alternating current insulation detection device (11) is connected with the N line of the front half section of the power supply line through the current transformer (12);
the second end of the alternating current insulation detection device (11) is connected with a first three-phase line of a front half power supply circuit through a normally closed contact (13) of the relay; the first three-phase line is one of the three-phase lines;
a branch circuit at the second end of the alternating current insulation detection device (11) is connected with the first three-phase line of the second half-section power supply circuit through a normally open contact (14) of the relay;
the alternating current insulation detection device (11) is used for acquiring alternating current signals acquired by the current transformer (12), realizing the diagnosis of poor insulation faults and controlling the relay according to the diagnosis result;
the front half power supply line and the rear half power supply line are communicated and disconnected under the control of a power line disconnecting device (15);
wherein if the AC insulation detection device (11) determines that an insulation fault exists;
disconnecting the first half power supply line and the second half power supply line;
starting the first half-row auxiliary inverter, and judging whether the insulation failure fault disappears or not according to the collected alternating current signal;
if the poor insulation fault disappears, judging that the poor insulation fault occurs in the second half section of the power supply line;
and if the poor insulation fault does not disappear, judging that the poor insulation fault occurs in the first half section of the power supply line.
2. An ac insulation detection method implemented by the ac insulation detection system according to claim 1, comprising:
collecting an alternating current signal;
judging that the alternating current signal is greater than a preset threshold value;
determining that a fault of poor insulation exists;
disconnecting the first half power supply line and the second half power supply line;
starting the first half-row auxiliary inverter, and judging whether the insulation failure fault disappears or not according to the collected alternating current signal;
if the poor insulation fault disappears, judging that the poor insulation fault occurs in the second half section of the power supply line;
and if the poor insulation fault does not disappear, judging that the poor insulation fault occurs in the first half section of the power supply line.
3. The AC insulation detection method according to claim 2,
the step of judging that the fault with poor insulation occurs in the second half section of the power supply line further comprises the following steps:
the normally closed contact (13) of the relay keeps a closed state, the normally open contact (14) keeps an open state, and the first half power supply line is kept to provide operation power.
4. The AC insulation detection method according to claim 2,
the step of judging that the poor insulation fault occurs after the first half section of power supply line further comprises the following steps:
isolating the first half row of auxiliary inverters, and starting the second half row of auxiliary inverters;
and the normally closed contact (13) of the relay is disconnected, the normally open contact (14) is closed, and the second half-section power supply line is switched to provide operation power.
5. A rail vehicle carrying the ac insulation detection system of claim 1.
6. An electronic device, comprising a memory and a processor, wherein the processor and the memory communicate with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the ac insulation detection method of any of claims 2 to 4.
7. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the AC insulation detection method of any one of claims 2 to 4.
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| CN114221382A (en) * | 2021-12-14 | 2022-03-22 | 阳光电源股份有限公司 | Power generation system and alternating current insulation detection method thereof |
| CN114962238A (en) * | 2022-06-29 | 2022-08-30 | 长沙昌佳自动化设备有限公司 | Intelligent controller for industrial pump |
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