CN110542836A - EMUs roof insulation detection device - Google Patents
EMUs roof insulation detection device Download PDFInfo
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- CN110542836A CN110542836A CN201910168039.7A CN201910168039A CN110542836A CN 110542836 A CN110542836 A CN 110542836A CN 201910168039 A CN201910168039 A CN 201910168039A CN 110542836 A CN110542836 A CN 110542836A
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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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Abstract
The invention discloses a motor train unit roof insulation detection device, which comprises: the device comprises a voltage regulating module, a control unit and a leakage current measuring module; the voltage regulating module is connected with a high-voltage bus of the high-voltage equipment, and the leakage current measuring module is connected with the grounding end of the high-voltage equipment after being connected in series with the voltage regulating module. The voltage regulating module is used for regulating the voltage applied to the high-voltage bus; the control unit can send the pressure regulating instruction to the pressure regulating module according to the power frequency withstand voltage pressure test rule or the operation overvoltage withstand voltage pressure test rule of predetermineeing, makes the pressure regulating module to the voltage that the high-voltage bus applyed, according to the leakage current value that the leakage current measurement module measured judges roof insulation equipment's insulating properties. The insulation detection device provided by the invention can be used for comprehensively detecting the insulation performance of the roof environment without influencing other high-voltage equipment.
Description
Technical Field
the invention relates to the technical field of detection of high-voltage equipment on the top of a motor train unit, in particular to a motor train unit top insulation detection device.
Background
With the continuous speed increase of railway technology, the coverage area of the motor train unit is gradually enlarged, and the requirements on the high-voltage equipment on the car roof are higher and higher under the operating conditions of high temperature, high altitude, strong ultraviolet rays and long traffic routes. The high-voltage equipment on the top of the motor train unit is exposed outside for a long time and is attacked by severe weather such as rain, snow, wind, sand, heavy fog, ice coating and the like, so that the insulation performance between the high-voltage electrical equipment and the top of the motor train unit is easily reduced, and the high-voltage equipment sends faults such as flashover, short circuit and the like, so that the motor train unit cannot normally rise bow. If the roof high-voltage equipment fails, drivers and passengers cannot accurately judge the failure of the roof high-voltage equipment and the reason for the failure, the blind pantograph lifting may cause short circuit between the roof high-voltage equipment when the blind pantograph lifting is reached, the high-voltage equipment is damaged, a contact net is bonded with a pantograph sliding plate, and the contact net is burnt out if the blind pantograph lifting is reached, so that the whole line is paralyzed.
In the prior art, a motor train unit generally utilizes voltage changes of a primary winding and a secondary winding of a high-voltage transformer installed on a locomotive to realize insulation test of a roof high-voltage device. The insulation test of the high-voltage equipment on the car roof is realized by applying instantaneous high voltage to the primary winding of the voltage transformer on the car roof and detecting the size of leakage current on the side of the secondary winding, the capacity of the high-voltage equipment on the car roof is less than 300VA, and the highest voltage is only 25 kV. Data of four-level pollution experiments performed in a phytotron laboratory show that when the high-voltage equipment on the roof generates pollution flashover, the high-voltage experimental equipment can provide 3000VA capacity.
In conclusion, it can be seen that how to effectively detect the insulation performance of the environment of the roof of the vehicle without affecting the normal operation of other high-voltage equipment is a problem to be solved at present.
disclosure of Invention
The invention aims to provide a motor train unit roof insulation detection device, which solves the problem that the insulation performance of the roof environment cannot be comprehensively detected without influencing the normal work of other high-voltage equipment in the prior art.
In order to solve the technical problem, the invention provides a motor train unit roof insulation detection device, which comprises: the device comprises a voltage regulating module, a control unit and a leakage current measuring and measuring module; the voltage regulating module is connected with a high-voltage bus of high-voltage equipment on the top of the motor train unit, and the leakage current measuring module is connected with the voltage regulating module in series and then is connected to the grounding end of the high-voltage equipment on the top of the motor train unit; the voltage regulating module is used for regulating voltage applied to the roof high-voltage bus; the control unit sends a voltage regulating instruction to the voltage regulating module according to a preset power frequency withstand voltage test rule, so that the voltage applied to the high-voltage bus by the voltage regulating module is gradually increased from 0KV to 30 KV; measuring a leakage current value by using the leakage current measuring module in the change process of the voltage applied to the high-voltage bus, and judging the insulation performance of the motor train unit roof insulation equipment according to the leakage current value measured by the leakage current measuring module; the control unit sends a voltage regulating instruction to the voltage regulating module according to a preset operation overvoltage withstand voltage test rule, so that the voltage regulating module applies 30KV alternating-current voltage to the high-voltage bus, the leakage current measuring module is used for measuring the leakage current value, and the insulation performance of the motor train unit roof insulation equipment is judged according to the leakage current value measured by the leakage current measuring module.
Preferably, the control unit is specifically configured to: when the voltage of 0KV to 30KV is gradually applied to the high-voltage bus, whether flashover occurs to the vehicle roof high-voltage equipment is judged according to the leakage current value, if yes, the control unit stops boosting the high-voltage bus, and an alarm is given to drivers and passengers; and the control unit sends a voltage regulating instruction to the voltage regulating module again, so that the voltage regulating module gradually applies a voltage of 0KV to 30KV to the high-voltage bus again, the leakage current measuring module is used for measuring the leakage current value again in the voltage applying process, and the insulation performance of the motor train unit roof insulation equipment is judged according to the newly measured leakage current value.
Preferably, when the voltage regulating module gradually applies a voltage of 0KV to 30KV to the high-voltage bus again, the roof high-voltage device is subjected to flashover again, and the roof insulation device transmits a serious insulation defect.
Preferably, the voltage regulation module includes: an inverter, a voltage regulator, a high voltage transformer; the inverter is used for converting direct-current voltage obtained by a vehicle-mounted storage battery of the motor train unit into continuously variable low-voltage power-frequency alternating-current voltage; the voltage regulator regulates the low-voltage power frequency alternating current voltage transmitted to the high-voltage transformer according to the voltage regulating instruction sent by the control unit; the high-voltage transformer is used for converting the low-voltage power frequency alternating current determined by the voltage regulator into corresponding high-voltage power frequency alternating voltage and transmitting the high-voltage power frequency alternating voltage to the high-voltage bus.
Preferably, the inverter is specifically configured to: the 24V direct-current voltage obtained by the vehicle-mounted storage battery of the motor train unit is converted into 220V alternating-current voltage, and the 220V alternating-current voltage is converted into 0-250V continuously variable alternating-current voltage.
Preferably, the motor train unit roof insulation detection device comprises a permanent magnet high-voltage switch, wherein the permanent magnet high-voltage switch is used for controlling connection between the motor train unit roof insulation detection device and the high-voltage bus; the high-voltage transformer is connected with the high-voltage bus through the permanent magnet high-voltage switch.
Preferably, the leakage current measuring module includes: current transformers, milliamps; the primary coil of the current transformer is connected in series between the grounding end of the high-voltage transformer and the grounding end of the high-voltage equipment; and a secondary coil of the current transformer is connected with the milliammeter in series and then connected with the control unit, so that the leakage current value can be measured and judged conveniently.
Preferably, a primary coil of the current transformer does not form a loop, and a secondary coil of the current transformer does not generate induced current, so that the insulation defect of the motor train unit roof insulation equipment does not occur; and a primary coil of the current transformer forms a loop, and a secondary coil of the current transformer generates induced current, so that the insulation defect of the insulation equipment on the top of the motor train unit occurs.
Preferably, the control unit is further configured to: and collecting and storing each leakage current value measured by the leakage current measuring module and an insulation performance judgment result corresponding to each leakage current value, and displaying each leakage current value and the judgment result of each leakage current value to the driver and passengers of the motor train unit.
The invention provides a motor train unit roof insulation detection device, which comprises: the motor train unit roof high-voltage device comprises a voltage regulating module, a control unit and a leakage current measuring module, wherein the voltage regulating module is connected with a high-voltage bus of the motor train unit roof high-voltage device, and the leakage current measuring module is connected with the voltage regulating module in series and then connected to the grounding end of the roof high-voltage device. The voltage regulating module is used for regulating voltage applied to the roof high-voltage bus; the control unit can send a voltage regulating instruction to the voltage regulating module according to a preset power frequency voltage withstand test rule or an operation overvoltage voltage withstand test rule, so that the voltage regulating module can judge the insulation performance of the motor train unit roof insulation equipment according to the voltage applied to the high-voltage bus by the voltage regulating module and the leakage current value measured by the leakage current measuring module.
The invention provides a motor train unit roof insulation detection device which is arranged between a high-voltage bus and a grounding end of motor train unit roof high-voltage equipment. Before the motor train unit runs, namely the pantograph of the motor train unit is lowered and the main circuit breaker is disconnected, the motor train unit roof insulation detection device provided by the invention can be used for carrying out two kinds of detection of power frequency voltage withstand test and operation overvoltage voltage withstand test on roof insulation equipment. When power frequency voltage withstand test detection is carried out, the control unit issues a voltage regulating instruction to the voltage regulating module, so that the voltage applied to the high-voltage bus gradually rises from 0KV to 30KV, the leakage current detection device is used for measuring the leakage current value, and the leakage current value is used for judging the insulation performance of the motor train unit roof insulation equipment. In order to more comprehensively detect the insulation performance of the insulating equipment on the car roof, the detection device provided by the invention can simulate the overvoltage state when the pantograph rises, and detect the insulation performance of the insulating equipment, namely, the voltage is adjusted to 30KV by using the voltage adjusting module and then applied to the high-voltage bus, and then the leakage current value is measured by using the leakage current measuring module, so that the insulation performance of the insulating equipment is judged. By utilizing the motor train unit roof insulation detection device provided by the invention, the insulation performance of the insulation equipment can be effectively detected without influencing other high-voltage equipment. And when the power frequency withstand voltage pressure test is carried out on the insulating equipment, the dirty substances of the insulating equipment can be gasified by the discharge arc, so the motor train unit roof insulation detection device provided by the invention has a repairing function on the reduction of the insulation performance of the high-voltage equipment caused by filth and fog, and further reduces the flashover accidents caused by the filth and the fog.
drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, 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 only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a block diagram of an embodiment of a motor train unit roof insulation detection device provided by the invention;
FIG. 2 is a schematic diagram of the working principle of the car roof insulation detection device provided by the invention;
fig. 3 is a schematic view of an installation position of the motor train unit roof insulation detection device provided by the invention.
Detailed Description
The core of the invention is to provide a motor train unit roof insulation detection device which can comprehensively detect the insulation performance of the roof environment without influencing other high-voltage equipment. In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Referring to fig. 1, fig. 1 is a structural diagram of a first embodiment of a motor train unit roof insulation detection device provided by the invention; the EMUs roof insulation detection device that this embodiment provided includes: the device comprises a voltage regulating module, a control unit and a leakage current measuring and measuring module; the voltage regulating module is connected with a high-voltage bus of high-voltage equipment on the top of the motor train unit, and the leakage current measuring module is connected with the voltage regulating module in series and then is connected to the grounding end of the high-voltage equipment on the top of the motor train unit; the voltage regulating module is used for regulating voltage applied to the roof high-voltage bus; the control unit sends a voltage regulating instruction to the voltage regulating module according to a preset power frequency withstand voltage test rule, so that the voltage applied to the high-voltage bus by the voltage regulating module is gradually increased from 0KV to 30 KV; measuring a leakage current value by using the leakage current measuring module in the change process of the voltage applied to the high-voltage bus, and judging the insulation performance of the motor train unit roof insulation equipment according to the leakage current value measured by the leakage current measuring module; the control unit sends a voltage regulating instruction to the voltage regulating module according to a preset operation overvoltage withstand voltage test rule, so that the voltage regulating module applies 30KV alternating-current voltage to the high-voltage bus, the leakage current measuring module is used for measuring the leakage current value, and the insulation performance of the motor train unit roof insulation equipment is judged according to the leakage current value measured by the leakage current measuring module.
In this embodiment, the voltage regulating module may include an inverter, a voltage regulator, and a high voltage transformer. The roof insulation detection device provided by the embodiment detects when the train is in a non-running state, namely, the motor train unit is in a state that a pantograph is lowered and a main circuit breaker is disconnected, so that the roof insulation detection device obtains 24V direct-current voltage by using a vehicle-mounted storage battery of the motor train unit, the inverter converts the 24V direct-current voltage into 220V alternating-current voltage, and then converts the 220V alternating-current voltage into 0V-250V continuously variable alternating-current voltage; the voltage regulator regulates the alternating voltage of 0V to 250V according to the voltage required by the detection of the car roof insulation equipment; and then the regulated voltage is converted into corresponding high-voltage power frequency alternating voltage through the high-voltage transformer.
The leakage current collecting module may include: current transformers, milliamps;
The primary coil of the current transformer is connected in series between the grounding end of the high-voltage transformer and the grounding end of the high-voltage equipment; and a secondary coil of the current transformer is connected with the milliammeter in series and then connected with the control unit, so that the leakage current value can be measured and judged conveniently.
the motor train unit roof insulation detection device provided by the embodiment can comprise a permanent magnet high-voltage switch, and the permanent magnet high-voltage switch is used for controlling the connection between the motor train unit roof insulation detection device and the high-voltage bus. When the motor train unit operates, the permanent magnet high-voltage switch can be disconnected, and the influence of the roof insulation detection device on the roof high-voltage equipment is prevented. And the high-voltage transformer is connected with the grounding end of the roof insulation equipment through the permanent magnet high-voltage switch.
by utilizing the roof insulation detection device provided by the embodiment, power frequency voltage withstand test and operation voltage withstand test can be performed on roof insulation equipment. The power frequency voltage withstand test is a voltage withstand test in a mode that the voltage applied to the high-voltage bus is adjusted by the control unit to slowly rise from 0kV to 30 kV; the withstand voltage test of the operation overvoltage is a withstand voltage test for performing a 30kV high-voltage closed switch.
When the insulation performance of the roof insulation equipment is detected, firstly, power frequency voltage withstand test is carried out, and when a voltage of 0KV to 30KV is gradually applied to the high-voltage bus, two phenomena may occur in the roof high-voltage equipment.
One phenomenon is that flashover occurs in a roof high-voltage device, whether flashover occurs or not is judged according to a leakage current value, if yes, the control unit automatically stops boosting the high-voltage bus and gives an alarm to drivers and passengers, in order to eliminate errors and judgment errors of a detection device, the control unit sends a voltage regulating instruction to the voltage regulating module again, the voltage regulating module gradually applies voltage of 0KV to 30KV to the high-voltage bus again, in the voltage applying process, the leakage current value is measured again by the leakage current measuring module, and the insulation performance of the motor train unit roof insulation device is judged according to the newly measured leakage current value; when the high voltage does not reach 30kV in the boosting process and flashover occurs again, the serious insulation defect of the car roof insulation equipment is shown, and the car roof insulation equipment needs to be overhauled.
The other phenomenon is that the vehicle roof high-voltage equipment does not have flashover, only the leakage current exceeds the standard, and at the moment, another alarm prompting method is used for displaying the leakage current exceeding standard value to drivers and conductors; and gradually applying the voltage of 0KV to 30KV to the high-voltage bus again, sampling the leakage current value for multiple times, and judging whether to continue to carry out pressure-resistant pressure test according to the pressure resistance of the two times of boosting when the leakage current value obtained by retesting exceeds the standard again. If the two voltage withstanding times are very close, the serious pollution of the car roof insulation is shown, and the car roof insulation must be cleaned; if the second voltage withstand is obviously improved, the voltage withstand test can be continuously repeated until the voltage withstand reaches 30kV, and the filthy substance can be gasified by the discharge arc, so that the insulation performance is recovered, and the power frequency voltage withstand test has a certain cleaning effect.
After the power frequency voltage-withstand test is passed, in order to further simulate the pantograph lifting process and operate the overvoltage voltage-withstand test, the voltage is lifted to 30kV by the voltage-regulating module, then the permanent magnet high-voltage switch is closed, if flashover does not occur, the motor train unit normally lifts the pantograph, and if not, the insulation of equipment needs to be checked.
The schematic diagram of the working principle of the roof insulation detection device provided by the embodiment is shown in fig. 2; wherein, R is the protection resistance of the roof detection device, R0 is the equivalent resistance of the roof detection device, Rx is the equivalent resistance of the roof insulator, and S is the permanent magnet high voltage switch. A primary coil of the current transformer does not form a loop, a secondary coil of the current transformer does not generate induced current, namely the milliammeter does not detect the current value, and the insulation defect of the motor train unit roof insulation equipment does not occur; and a primary coil of the current transformer forms a loop, and a secondary coil of the current transformer generates induced current, namely the milliammeter detects the current value, so that the insulation defect of the motor train unit roof insulation equipment occurs. The larger the leakage current value is, the worse the insulation performance is, and according to the arrangement of the vehicle roof insulation detection device provided by the embodiment, the size range of the current value of the measurable insulation end is not more than 100 mA. The control unit can also convert the collected leakage current value into a voltage value, so that the damage degree of the insulation performance of the roof insulation equipment is judged according to the voltage value.
Before detecting the roof insulation device, the control unit of the roof insulation detection device provided in this embodiment may issue an instruction to an inverter, a voltage regulator, a high-voltage transformer, and the like in the roof insulation detection device to perform device self-check, and then detect the roof insulation device after each device confirms that the self-check is passed. The control unit can also collect, compare and judge the leakage current value detected by the leakage current measuring module, and prompt warning, normality and the like and inform the leakage current value according to the judgment result; meanwhile, the detection data is stored or notified to an upper-level system for query.
As shown in fig. 3, the motor train unit roof insulation detection device provided by the invention is arranged between a high-voltage bus and a grounding terminal of a high-voltage device on the top of the motor train unit. By utilizing the motor train unit roof insulation detection device provided by the invention, the insulation performance of the insulation equipment can be effectively detected without influencing other high-voltage equipment. And when the power frequency withstand voltage pressure test is carried out on the insulating equipment, the dirty substances of the insulating equipment can be gasified by the discharge arc, so the motor train unit roof insulation detection device provided by the invention has a repairing function on the reduction of the insulation performance of the high-voltage equipment caused by filth and fog, and further reduces the flashover accidents caused by the filth and the fog.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or 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.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
the invention provides a motor train unit roof insulation detection device which is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a EMUs roof insulation detection device which characterized in that includes: the device comprises a voltage regulating module, a control unit and a leakage current measuring module;
The voltage regulating module is connected with a high-voltage bus of high-voltage equipment on the top of the motor train unit, and the leakage current measuring module is connected with the voltage regulating module in series and then is connected to the grounding end of the high-voltage equipment on the top of the motor train unit;
The voltage regulating module is used for regulating voltage applied to the roof high-voltage bus;
The control unit sends a voltage regulating instruction to the voltage regulating module according to a preset power frequency withstand voltage test rule, so that the voltage applied to the high-voltage bus by the voltage regulating module is gradually increased from 0KV to 30 KV; measuring a leakage current value by using the leakage current measuring module in the change process of the voltage applied to the high-voltage bus, and judging the insulation performance of the motor train unit roof insulation equipment according to the leakage current value measured by the leakage current measuring module;
the control unit sends a voltage regulating instruction to the voltage regulating module according to a preset operation overvoltage withstand voltage test rule, so that the voltage regulating module applies 30KV alternating-current voltage to the high-voltage bus, the leakage current measuring module is used for measuring the leakage current value, and the insulation performance of the motor train unit roof insulation equipment is judged according to the leakage current value measured by the leakage current measuring module.
2. The motor train unit roof insulation detection device of claim 1, wherein the control unit is specifically configured to:
When the voltage of 0KV to 30KV is gradually applied to the high-voltage bus, whether flashover occurs to the vehicle roof high-voltage equipment is judged according to the leakage current value, if yes, the control unit stops boosting the high-voltage bus, and an alarm is given to drivers and passengers;
And the control unit sends a voltage regulating instruction to the voltage regulating module again, so that the voltage regulating module gradually applies a voltage of 0KV to 30KV to the high-voltage bus again, the leakage current measuring module is used for measuring the leakage current value again in the voltage applying process, and the insulation performance of the motor train unit roof insulation equipment is judged according to the newly measured leakage current value.
3. The motor train unit roof insulation detection device of claim 2, wherein when the voltage regulation module gradually applies the voltage of 0KV to 30KV to the high-voltage bus again, the roof high-voltage equipment is subjected to flashover again, and the roof insulation equipment sends serious insulation defects.
4. The motor train unit roof insulation detection device of claim 1, wherein the voltage regulation module comprises: an inverter, a voltage regulator, a high voltage transformer;
the inverter is used for converting direct-current voltage obtained by a vehicle-mounted storage battery of the motor train unit into continuously variable low-voltage power-frequency alternating-current voltage;
the voltage regulator regulates the low-voltage power frequency alternating current voltage transmitted to the high-voltage transformer according to the voltage regulating instruction sent by the control unit;
the high-voltage transformer is used for converting the low-voltage power frequency alternating current determined by the voltage regulator into corresponding high-voltage power frequency alternating voltage and transmitting the high-voltage power frequency alternating voltage to the high-voltage bus.
5. The motor train unit roof insulation detection device of claim 4, wherein the inverter is specifically configured to: the 24V direct-current voltage obtained by the vehicle-mounted storage battery of the motor train unit is converted into 220V alternating-current voltage, and the 220V alternating-current voltage is converted into 0-250V continuously variable alternating-current voltage.
6. The motor train unit roof insulation detection device of claim 5, comprising a permanent magnet high-voltage switch, wherein the permanent magnet high-voltage switch is used for controlling the connection between the motor train unit roof insulation detection device and the high-voltage bus; the high-voltage transformer is connected with the high-voltage bus through the permanent magnet high-voltage switch.
7. The motor train unit roof insulation detection device of claim 6, wherein the leakage current measurement module comprises: current transformers, milliamps;
The primary coil of the current transformer is connected in series between the grounding end of the high-voltage transformer and the grounding end of the high-voltage equipment; and a secondary coil of the current transformer is connected with the milliammeter in series and then connected with the control unit, so that the leakage current value can be measured and judged conveniently.
8. The motor train unit roof insulation detection device of claim 7, wherein the primary coil of the current transformer does not form a loop, and the secondary coil of the current transformer does not generate induced current, so that no insulation defect occurs in the motor train unit roof insulation equipment;
And a primary coil of the current transformer forms a loop, and a secondary coil of the current transformer generates induced current, so that the insulation defect of the insulation equipment on the top of the motor train unit occurs.
9. the motor train unit roof insulation detection device of claim 1, wherein the control unit is further configured to: and collecting and storing each leakage current value measured by the leakage current measuring module and an insulation performance judgment result corresponding to each leakage current value, and displaying each leakage current value and the judgment result of each leakage current value to the driver and passengers of the motor train unit.
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| CN2018106619723 | 2018-06-25 | ||
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| CN107765141A (en) * | 2016-08-18 | 2018-03-06 | 四川航达机电技术开发服务中心 | A kind of bullet train roof insulator dielectric condition monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487558A (en) * | 2020-04-02 | 2020-08-04 | 中车青岛四方机车车辆股份有限公司 | Fault positioning device and method for high-voltage system of train |
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