CN211698136U - Automatic test system of alternating current power distribution module - Google Patents
Automatic test system of alternating current power distribution module Download PDFInfo
- Publication number
- CN211698136U CN211698136U CN202020087266.5U CN202020087266U CN211698136U CN 211698136 U CN211698136 U CN 211698136U CN 202020087266 U CN202020087266 U CN 202020087266U CN 211698136 U CN211698136 U CN 211698136U
- Authority
- CN
- China
- Prior art keywords
- power supply
- load
- subsystem
- communication connection
- management platform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model belongs to the technical field of industrial test, and discloses an automatic test system of an alternating current distribution module, which comprises a power supply and load module, a test control subsystem, a data integration subsystem, a thermal management platform and a safety management subsystem; the data integration subsystem is respectively in communication connection with the power supply and load module, the test control subsystem, the thermal management platform and the safety management subsystem, the power supply and load module is electrically connected with the thermal management platform, the safety management subsystem is in communication connection with the power supply and load module, the thermal management platform is provided with a power distribution module, and the thermal management platform is connected with the power distribution module. The utility model provides a practicality that prior art exists low, degree of automation is low, the error is big and the problem of function singleness.
Description
Technical Field
The utility model belongs to the technical field of the industrial test, concretely relates to automatic test system of AC distribution module.
Background
Along with the high-speed development of science and technology and economy, various power electronic equipment are applied to production and experiment, in production and experimental link, need apply various distribution module and equipment, in order to guarantee the security, the test work of distribution module is an important work, need carry out electric current, voltage and various unusual or fault condition tests to the distribution module, prior art tests the distribution module, generally use the manual work to test, the practicality is low, can't satisfy the test task that enlarges day by day, current test equipment degree of automation is low, the error is big, the function is single, can't satisfy the test needs that strengthen day by day.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem that prior art exists, the utility model aims to provide an exchange distribution module automatic test system for the practicality that solves prior art existence is low, degree of automation is low, the error is big and the problem of function singleness.
The utility model discloses the technical scheme who adopts does:
an automatic test system of an alternating current power distribution module comprises a power supply and load module, a test control subsystem, a data integration subsystem, a thermal management platform and a safety management subsystem;
the data integration subsystem is respectively in communication connection with the power supply and load module, the test control subsystem, the thermal management platform and the safety management subsystem, the power supply and load module is electrically connected with the thermal management platform, the safety management subsystem is in communication connection with the power supply and load module, the thermal management platform is provided with a power distribution module, and the thermal management platform is connected with the power distribution module.
Further, the power supply and load module includes input control power supply package, load power supply package and load cabinet group, and the control end of input control power supply package, the control end of load power supply package and the control end of load cabinet group all with data integration subsystem communication connection, and the output of input control power supply package, the output of load power supply package and the output of load cabinet group all with thermal management platform electric connection.
Furthermore, the safety management subsystem comprises a first signal conditioning board and a second signal conditioning board, the first signal conditioning board is in communication connection with the load power supply group and the data integration subsystem respectively, and the second signal conditioning board is in communication connection with the load cabinet group and the data integration subsystem respectively.
Furthermore, the input control power supply set comprises a bias power supply and an emergency control power supply, the control end of the bias power supply and the control end of the emergency control power supply are in communication connection with the data integration subsystem, and the output end of the bias power supply and the output end of the emergency control power supply are electrically connected with the thermal management platform.
Furthermore, the load power supply group comprises a first load power supply and a second load power supply, the second load power supply is mains supply, the mains supply is electrically connected with the thermal management platform through an alternating current power distribution cabinet, a three-phase electric leakage circuit breaker, a second three-phase circuit breaker and a second LEM sensor which are electrically connected in sequence, a control end of the second three-phase circuit breaker and a control end of the second LEM sensor are both in communication connection with the first signal conditioning board, and each phase of an output end of the three-phase electric leakage circuit breaker is provided with a fuse;
the first load power supply is a three-phase alternating-current voltage-regulating power supply, the input end of the first load power supply is electrically connected with the output end of the three-phase electric leakage circuit breaker, the output end of the first load power supply is electrically connected with the heat management platform through a first LEM sensor, a first three-phase circuit breaker and a second LEM sensor which are sequentially and electrically connected, and the control end of the first three-phase circuit breaker and the control end of the first LEM sensor are both in communication connection with the first signal conditioning board.
Furthermore, the load cabinet group comprises a first load cabinet and a second load cabinet, a control end of the first load cabinet and a control end of the second load cabinet are both in communication connection with the data integration subsystem, an output end of the first load cabinet is electrically connected with the thermal management platform through a third LEM sensor and a third three-phase circuit breaker which are sequentially electrically connected, and a control end of the third three-phase circuit breaker and a control end of the third LEM sensor are both in communication connection with the second signal conditioning board;
the control end of the second load cabinet and the control end of the second load cabinet are in communication connection with the data integration subsystem, the output end of the second load cabinet is electrically connected with the thermal management platform through a fourth LEM sensor and a fourth three-phase circuit breaker which are sequentially and electrically connected, and the control end of the fourth three-phase circuit breaker and the control end of the fourth LEM sensor are in communication connection with the second signal conditioning board.
Further, the heat management platform is provided with a natural heat dissipation subsystem, an interface group and a terminal group;
the interface group comprises a bias power interface, an emergency control power interface and a data bus interface; the power distribution module is electrically connected with the bias power supply through a bias power supply interface, is electrically connected with the emergency control power supply through an emergency control power supply interface, and is in communication connection with the data integration subsystem through a data bus interface;
the terminal group comprises a load voltage power-up terminal and a grounding terminal; the power distribution module is electrically connected with the first load power supply, the second load power supply, the first load power supply and the second load power supply through the load voltage power-up terminal.
The temperature detection module comprises a first temperature detection probe group and a second temperature detection probe group which are in communication connection with the data integration subsystem, the first temperature detection probe group and the second temperature detection probe group both comprise at least one temperature detection probe, the first temperature detection probe group is fixedly arranged on the outer side of the heat dissipation subsystem of the heat management platform, and the second temperature detection probe group is arranged on the outer side of the power distribution module; the voltage detection module is electrically connected with the thermal management platform.
Furthermore, the test control subsystem comprises a display, a first signal conditioning box, a second signal conditioning box, a PXI case and a PXI controller, the PXI controller is arranged inside the PXI case and is in communication connection with the data integration subsystem and the display respectively, a first signal conditioning board is arranged inside the first signal conditioning box, and a second signal conditioning board is arranged inside the second signal conditioning box.
The utility model has the advantages that:
the utility model discloses an degree of automation is high, can accomplish the test of whole functions, the performance of alternating current distribution module to realize computer processing, storage and gathering test data, improved the practicality, owing to adopted full automatization and essential safety design, operator's safety has obtained the assurance.
Drawings
FIG. 1 is a block diagram of an automatic test system for AC distribution modules;
fig. 2 is a circuit connection block diagram of an automatic test system for ac power distribution modules.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
Example 1:
as shown in fig. 1 and fig. 2, an automatic testing system for an ac power distribution module includes a power supply and load module, a test control subsystem, a data integration subsystem, a thermal management platform, and a security management subsystem;
the data integration subsystem is respectively in communication connection with the power supply and load module, the test control subsystem, the thermal management platform and the safety management subsystem, the power supply and load module is electrically connected with the thermal management platform, the safety management subsystem is in communication connection with the power supply and load module, the thermal management platform is provided with a power distribution module, and the thermal management platform is connected with the power distribution module;
the power supply and load module provides bias voltage, emergency control voltage, load working current and load working voltage for the test of the power distribution module; the test control subsystem is arranged and controls the data integration subsystem to carry out load voltage test accuracy calibration, load voltage accuracy test, overvoltage and undervoltage test, load current test accuracy calibration, load current accuracy test, conduction voltage drop test, turn-off leakage current test, overload and short circuit test, phase dislocation test and phase loss test; the safety management subsystem is used for monitoring the test data of the power distribution module, cutting off the load when necessary, and the system automatically cuts off the power supply of a load end within 2s, so that the workpiece is not damaged, and the safety of a user is ensured.
In this embodiment, power and load module include input control power supply package, load power supply package and load cabinet group, and the control end of input control power supply package, the control end of load power supply package and the control end of load cabinet group all with data integration subsystem communication connection, and the output of input control power supply package, the output of load power supply package and the output of load cabinet group all with heat management platform electric connection.
In this embodiment, the safety management subsystem includes a first signal conditioning board and a second signal conditioning board, and the first signal conditioning board is connected with load power supply group and data integration subsystem communication respectively, and the second signal conditioning board is connected with load cabinet group and data integration subsystem communication respectively.
In this embodiment, the input control power supply set includes a bias power supply and an emergency control power supply, a control end of the bias power supply and a control end of the emergency control power supply are both in communication connection with the data integration subsystem, and an output end of the bias power supply and an output end of the emergency control power supply are both electrically connected with the thermal management platform; the bias power supply and the emergency control power supply are both RT-7002-60 type program control module power supplies;
the bias power supply provides bias voltage required by the work of the test power distribution module, the voltage range of the bias power supply is 0-60V, the output current is not less than 1A, a data integration subsystem is adopted for step output control, the step value is not more than 1V, and the deviation of the output voltage is not more than +/-0.1V; the bias current test error is not more than +/-5 mA, and the bias voltage and the bias current can be collected and stored by the data integration subsystem;
the emergency control power supply provides emergency control voltage required by a test power distribution module, the voltage range is 0-60V, a data integration subsystem can be adopted for step output control, the step value is not more than 1V, and the output voltage deviation is not more than +/-0.1V; the output voltage can be collected and stored by the data integration subsystem; the control current provided by the emergency control power supply is not less than 1A, the test error of the emergency current is not more than +/-5 mA, and the test value of the emergency control current can be collected and stored by the data integration subsystem; and two paths of emergency control voltage outputs are provided, the output voltage range is 0-36V, the driving current is not less than 1A, the pulse duration is 50 ms-1800 s, the voltage and the pulse duration of the signal output are independently controlled by a data integration system, and the error of the duration is not more than 1% +/-10 ms of the set value.
In the embodiment, the load power supply group and the load cabinet group provide the working current and voltage of the module load, and the load current, voltage detection precision, overcurrent, overvoltage, undervoltage, short circuit, open phase and phase error test of the power distribution module are completed; the load power supply set comprises a first load power supply and a second load power supply, the second load power supply is mains supply, the mains supply is electrically connected with the thermal management platform through an alternating current power distribution cabinet, a three-phase electric leakage circuit breaker, a second three-phase circuit breaker and a second LEM sensor which are electrically connected in sequence, a control end of the second three-phase circuit breaker and a control end of the second LEM sensor are both in communication connection with the first signal conditioning board, and each phase of an output end of the three-phase electric leakage circuit breaker is provided with a fuse; the second load power supply is directly supplied by a power grid, 3-phase output current is provided by an alternating current power distribution cabinet, the output current of a three-phase circuit breaker of the power distribution cabinet is not less than 500A, and the second load power supply is used for completing overcurrent and short circuit protection tests of the power distribution module;
the first load power supply is a three-phase alternating-current voltage-regulating power supply, the specific model of the first load power supply is CIF-6030EP, the input end of the first load power supply is electrically connected with the output end of the three-phase leakage circuit breaker, the output end of the first load power supply is electrically connected with the thermal management platform through a first LEM sensor, a first three-phase circuit breaker and a second LEM sensor which are sequentially and electrically connected, and the control end of the first three-phase circuit breaker and the control end of the first LEM sensor are both in communication connection with the first signal conditioning board; the output voltage range of the first load power supply is 80-280V adjustable (single phase), the frequency of 110-280V (phase voltage) is 50-400 Hz adjustable, the output current is not less than 100A, the output voltage and frequency are controlled by the data integration subsystem in a stepping output mode, and the output voltage and frequency can be collected and stored by the data integration subsystem and are used for completing load current, voltage detection precision, overvoltage, undervoltage, phase failure and phase failure tests of the power distribution module.
In this embodiment, the load cabinet group includes a first load cabinet and a second load cabinet, the first load cabinet is an RLC ac load cabinet, and by means of an RS485 bus, a load is switched in or out in a segmented manner, the single-phase load current is not less than 100A, and is used for testing the load current accuracy of the power distribution module, the second load cabinet is an R ac load cabinet, and by means of a data bus, a load is switched in or out in a segmented manner, the number of segments is not less than 10, the single-phase load current is not less than 500A, and is used for testing the load overload and short circuit trip of the power distribution module; the control end of the first load cabinet and the control end of the second load cabinet are both in communication connection with the data integration subsystem, the output end of the first load cabinet is electrically connected with the thermal management platform through a third LEM sensor and a third three-phase circuit breaker which are sequentially and electrically connected, and the control end of the third three-phase circuit breaker and the control end of the third LEM sensor are both in communication connection with the second signal conditioning board;
the control end of the second load cabinet and the control end of the second load cabinet are both in communication connection with the data integration subsystem, the output end of the second load cabinet is electrically connected with the thermal management platform through a fourth LEM sensor and a fourth three-phase circuit breaker which are sequentially and electrically connected, and the control end of the fourth three-phase circuit breaker and the control end of the fourth LEM sensor are both in communication connection with the second signal conditioning board;
the RLC alternating current load cabinet and the R alternating current load cabinet are in communication connection with the data integration subsystem through an RS485 bus; the signal conditioning board acquires current and voltage sensing signals of the LEM sensor, converts the current and voltage sensing signals into analog signals and transmits the analog signals to the data integration subsystem, and when an abnormality or a fault occurs, the signal conditioning board sends out a breaker control signal to disconnect a related three-phase breaker;
the safety requirements of this embodiment are: the safety of an operator is ensured by the aid of an electric shock prevention protection device; the loading contactors of the first load power supply and the second load power supply should be interlocked to ensure that they are not switched on at the same time; when overvoltage, overcurrent and short circuit tests are carried out, when the tested power distribution module does not finish protection action within the specified time, the load is cut off, and the system automatically cuts off power supply at the load end within 2s so as to ensure that workpieces are not damaged; after the test stopping button is pressed down, all the load contactors are ensured to be in an off state, and if the load voltage exceeds 10Vrms, an alarm is given.
In this embodiment, the thermal management platform is provided with a natural heat dissipation subsystem, an interface group and a terminal group;
the interface group comprises a bias power interface, an emergency control power interface and a data bus interface; the power distribution module is electrically connected with the bias power supply through a bias power supply interface, is electrically connected with the emergency control power supply through an emergency control power supply interface, and is in communication connection with the data integration subsystem through a data bus interface;
the terminal group comprises a load voltage power-up terminal and a grounding terminal; the power distribution module is electrically connected with the first load power supply, the second load power supply, the first load power supply and the second load power supply through the load voltage power-up terminal.
In the embodiment, the temperature detection device further comprises a temperature detection module and a voltage detection module which are both in communication connection with the data integration subsystem, wherein the temperature detection module comprises a first temperature detection probe group and a second temperature detection probe group which are both in communication connection with the data integration subsystem, the first temperature detection probe group and the second temperature detection probe group both comprise two temperature detection probes, the first temperature detection probe group is fixedly arranged at the outer side of the heat dissipation subsystem of the heat management platform, the second temperature detection probe group adopts two patch type probes arranged at the outer side of the power distribution module, the surface temperature of the power distribution module is detected, the temperature test range is-55-125 ℃, and the test error is +/-1 ℃; the voltage detection module is electrically connected with the thermal management platform, provides 4-path state voltage detection function, detects the voltage range of 0-36V, and collects and records voltage signals by the data integration subsystem, and the test error is +/-0.2V.
In this embodiment, the test control subsystem includes a display, a first signal conditioning box, a second signal conditioning box, a PXI chassis and a PXI controller, the PXI controller is disposed inside the PXI chassis and is in communication connection with the data integration subsystem and the display, respectively, the first signal conditioning board is disposed inside the first signal conditioning box, and the second signal conditioning board is disposed inside the second signal conditioning box;
the first signal conditioning board and the second signal conditioning board respectively complete load power supply groups and load cabinet groups, analog signals detected by the Hall sensors are conditioned, input power supply switching control and overcurrent and overvoltage protection control are automatically performed according to the setting of an upper computer, a PXI controller with the model of RT-9201, a PXI data acquisition module, a PXI serial port module and a PXI/O module are matched and inserted into a PXI case with the model of RT-9008, and voltage and current waveform acquisition, state control, data operation storage and thermal management platform management are achieved.
The present invention is not limited to the above-mentioned alternative embodiments, and various other products can be obtained by anyone under the teaching of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.
Claims (9)
1. The utility model provides an exchange automatic test system of distribution module which characterized in that: the system comprises a power supply and load module, a test control subsystem, a data integration subsystem, a thermal management platform and a safety management subsystem;
the data integration subsystem is respectively in communication connection with the power supply and load module, the test control subsystem, the thermal management platform and the safety management subsystem, the power supply and load module is electrically connected with the thermal management platform, the safety management subsystem is in communication connection with the power supply and load module, the thermal management platform is provided with a power distribution module, and the thermal management platform is connected with the power distribution module.
2. The ac power distribution module automatic test system of claim 1, wherein: the power supply and load module comprises an input control power supply set, a load power supply set and a load cabinet set, wherein the control end of the input control power supply set, the control end of the load power supply set and the control end of the load cabinet set are in communication connection with the data integration subsystem, and the output end of the input control power supply set, the output end of the load power supply set and the output end of the load cabinet set are all electrically connected with the heat management platform.
3. The ac power distribution module automatic test system of claim 2, wherein: the safety management subsystem comprises a first signal conditioning board and a second signal conditioning board, the first signal conditioning board is in communication connection with the load power supply set and the data integration subsystem respectively, and the second signal conditioning board is in communication connection with the load cabinet set and the data integration subsystem respectively.
4. The ac power distribution module automatic test system of claim 3, wherein: the input control power supply set comprises a bias power supply and an emergency control power supply, the control end of the bias power supply and the control end of the emergency control power supply are in communication connection with the data integration subsystem, and the output end of the bias power supply and the output end of the emergency control power supply are electrically connected with the thermal management platform.
5. The ac power distribution module automatic test system of claim 3, wherein: the load power supply set comprises a first load power supply and a second load power supply, the second load power supply is mains supply, the mains supply is electrically connected with the thermal management platform through an alternating current power distribution cabinet, a three-phase electric leakage circuit breaker, a second three-phase circuit breaker and a second LEM sensor which are electrically connected in sequence, a control end of the second three-phase circuit breaker and a control end of the second LEM sensor are both in communication connection with the first signal conditioning board, and each phase of an output end of the three-phase electric leakage circuit breaker is provided with a fuse;
first load power is three-phase AC voltage regulation power, its input and three-phase electric leakage circuit breaker's output electric connection, and its output through electric connection's first LEM sensor, first three-phase circuit breaker and second LEM sensor and thermal management platform electric connection in proper order, the control end of first three-phase circuit breaker and the control end of first LEM sensor all with first signal conditioning board communication connection.
6. The ac power distribution module automatic test system of claim 3, wherein: the load cabinet group comprises a first load cabinet and a second load cabinet, a control end of the first load cabinet and a control end of the second load cabinet are both in communication connection with the data integration subsystem, an output end of the first load cabinet is electrically connected with the thermal management platform through a third LEM sensor and a third three-phase circuit breaker which are sequentially and electrically connected, and a control end of the third three-phase circuit breaker and a control end of the third LEM sensor are both in communication connection with the second signal conditioning board;
the control end of the second load cabinet and the control end of the second load cabinet are in communication connection with the data integration subsystem, the output end of the second load cabinet is electrically connected with the thermal management platform through a fourth LEM sensor and a fourth three-phase circuit breaker which are sequentially and electrically connected, and the control end of the fourth three-phase circuit breaker and the control end of the fourth LEM sensor are in communication connection with the second signal conditioning board.
7. The ac power distribution module automatic test system of claim 1, wherein: the heat management platform is provided with a natural heat dissipation subsystem, an interface group and a terminal group;
the interface group comprises a bias power interface, an emergency control power interface and a data bus interface; the power distribution module is electrically connected with the bias power supply through a bias power supply interface, is electrically connected with the emergency control power supply through an emergency control power supply interface, and is in communication connection with the data integration subsystem through a data bus interface;
the terminal set comprises a load voltage power-up terminal and a ground terminal; the power distribution module is electrically connected with the first load power supply, the second load power supply, the first load power supply and the second load power supply through the load voltage power-up terminal.
8. The ac power distribution module automatic test system of claim 7, wherein: the temperature detection module comprises a first temperature detection probe group and a second temperature detection probe group which are both in communication connection with the data integration subsystem, the first temperature detection probe group and the second temperature detection probe group both comprise at least one temperature detection probe, the first temperature detection probe group is fixedly arranged on the outer side of the heat dissipation subsystem of the heat management platform, and the second temperature detection probe group is arranged on the outer side of the power distribution module; the voltage detection module is electrically connected with the thermal management platform.
9. The ac power distribution module automatic test system of claim 3, wherein: the test control subsystem comprises a display, a first signal conditioning box, a second signal conditioning box, a PXI case and a PXI controller, the PXI controller is arranged inside the PXI case and is in communication connection with the data integration subsystem and the display respectively, a first signal conditioning board is arranged inside the first signal conditioning box, and a second signal conditioning board is arranged inside the second signal conditioning box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020087266.5U CN211698136U (en) | 2020-01-15 | 2020-01-15 | Automatic test system of alternating current power distribution module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020087266.5U CN211698136U (en) | 2020-01-15 | 2020-01-15 | Automatic test system of alternating current power distribution module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211698136U true CN211698136U (en) | 2020-10-16 |
Family
ID=72772295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020087266.5U Active CN211698136U (en) | 2020-01-15 | 2020-01-15 | Automatic test system of alternating current power distribution module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211698136U (en) |
-
2020
- 2020-01-15 CN CN202020087266.5U patent/CN211698136U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202737576U (en) | Intelligent measure-control apparatus used for low voltage power distribution network | |
| CN201540362U (en) | DC power parameter automatic testing device | |
| CN210051836U (en) | Intelligent large-current temperature rise test system | |
| CN110673054B (en) | DC/DC power supply test system and aging test method of DC/DC power supply | |
| CN112649726B (en) | Switch class mechanical life test circuit and method | |
| CN211698136U (en) | Automatic test system of alternating current power distribution module | |
| CN211402564U (en) | Automatic testing arrangement of new energy automobile battery charging outfit | |
| CN102944809B (en) | Method for rapidly identifying power grid fault | |
| CN215681798U (en) | Voltage parallel device capable of automatically switching states | |
| CN204330904U (en) | A kind of frequency converter test device | |
| CN215643311U (en) | Direct current fills electric pile teaching platform with single step operation function | |
| CN213275830U (en) | A insulating monitoring module for new forms of energy electric automobile direct current fills electric pile | |
| CN210668602U (en) | Full-automatic discharge nuclear capacity testing device for storage battery of wind power plant | |
| CN210041312U (en) | Over-voltage and under-voltage protection circuit | |
| CN111682562A (en) | Unbalanced three-phase automatic regulating system | |
| CN212410663U (en) | High-voltage electrical component test system | |
| CN217112562U (en) | Power supply and distribution fault handling device and power supply and distribution system | |
| CN213185867U (en) | Program-controlled power management system of track equipment test bench | |
| CN215067242U (en) | Transformer substation alternating current series-connection fault simulation device | |
| CN219779788U (en) | Continuous reactive power compensation device | |
| CN204462838U (en) | AC servo motor hardware-in-the-loop test device | |
| CN216526175U (en) | Resistive load life monitoring system of JL contactor | |
| CN217305480U (en) | Energy controller loop state monitoring and testing system | |
| CN214669519U (en) | Direct current ground fault simulation device of transformer substation | |
| CN218549948U (en) | Test equipment for railway electric telecontrol terminal device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |