CN210577807U - Single track railway power supply safety guarantee device - Google Patents
Single track railway power supply safety guarantee device Download PDFInfo
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- CN210577807U CN210577807U CN201921705883.0U CN201921705883U CN210577807U CN 210577807 U CN210577807 U CN 210577807U CN 201921705883 U CN201921705883 U CN 201921705883U CN 210577807 U CN210577807 U CN 210577807U
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Abstract
The utility model relates to a single line railway power supply safety guarantee device, including input module, broad width voltage stabilizing module, battery pack module, vary voltage module, filter module, bypass module, the static change over switch module of STS and output module. The input end module can simultaneously receive a single-wire power supply and a generator power supply, and sends the single-wire power supply and the generator power supply to the wide voltage stabilizing module for rectification, voltage stabilization, filtering and inversion, and finally outputs a high-quality alternating current power supply; the storage battery pack module is arranged to ensure that the system is not powered down in the switching process of the single-wire power supply and the generator power supply; the STS static change-over switch module and the bypass module ensure that the system does not lose power when the wide voltage stabilizing module cannot work. The utility model discloses an above-mentioned device has realized the guarantee of single line railway power supply safety.
Description
Technical Field
The utility model belongs to the railway equipment power supply field, specifically speaking relates to a single line railway power supply safety guarantee device.
Background
The power system is an organic whole from power generation, power transmission, power transformation and power distribution to power utilization, the power source of the power system can be traditional energy sources such as water energy and heat energy, and can also be new energy sources such as solar energy, wind energy and nuclear energy, and the railway power supply system is a subsystem with special load characteristics in the power system. The railway power supply system can be divided into two parts: electric power supply and traction power supply. The electric power supply system provides reliable electric power guarantee for services such as dispatching command, communication signals, passenger service and the like, and the traction power supply system provides electric energy for electric locomotives (motor train units) of the electrified railways.
For a power supply system: the railway power supply line is generally composed of a primary load power through line and a comprehensive power through line which are arranged along the whole railway. The voltage class of the power through line is usually 10kV, the power supply distance is 30-50km, and the power supply distance exceeds 100km under special conditions such as the adoption of 35kV voltage class of a Tibet railway. Communication, signal, comprehensive regulation systems and the like related to the travelling crane along the line are mainly supplied by a first-level load power through line, and comprehensive power through lines are supplied by spare power. Other electric loads and power supplies for various traction substations are supplied with power through comprehensive power through wires, and 10kV box-type substations are arranged at various power points in the interval. Two paths of mutually independent incoming line power supplies of the power transformation and distribution station are provided by a public power grid, and incoming line voltage grades are 10KV, 35kV, 110kV, 220kV and the like. The electric loads are classified into two types, station loads and section loads. The station loads mainly include communication, signals, disaster prevention and alarm, automatic ticket checking, customer service, electric power monitoring, fire-fighting systems, various water pumps, various ventilators, air conditioners, escalators, elevators, electric heating equipment, various production and living lighting and station area lighting loads. The section load mainly comprises communication, a signal relay station, an optical fiber repeater, a power supply operated by a traction substation, tunnel lighting and monitoring equipment and the like. The load is divided into three load grades according to the importance degree, and the most important first-grade load comprises the following steps: communication, signals, disaster prevention and alarm, automatic ticket inspection, customer service, power monitoring, fire-fighting systems, emergency lighting, platform lighting, lighting of underground exit halls, lighting of main control rooms and the like.
For a traction power supply system: the traction transformation has the function of converting 110KV or 220KV three-phase alternating current introduced by a power system into 27.5KV single-phase alternating current, and the alternating current is transmitted to a contact net along a circuit through a feeder line to supply power to an electric locomotive. And a few traction substations also bear the power supply of 10kV power load of industrial and agricultural users in railway regions. In addition to the conventional common three-phase transformer of the power system, the traction transformer also usually adopts special junction transformers, such as single-phase junction, VV junction, scott junction, impedance matching balance junction, etc., to meet the special requirements of the traction load. In the junction area of the electrified railway, the places with more concentrated railway facilities such as passenger stations, marshalling stations, electric locomotive service sections and the like, because station lines are long in extension and the number of station tracks is large, the structure and configuration of a contact network are complex, and the operation of passenger and freight transportation meeting, marshalling and electric locomotive preparation is busy, the probability of the fault of a traction network in the area is increased.
The existing power supply mode of the single-track railway station is single-track power supply and is provided with a diesel generator. When the single-way power supply is in power failure, the generator is automatically started to supply power, and when the single-way power supply is recovered, the single-way power supply can be automatically switched to supply power, so that the generator stops working. During the starting and switching process of the generator, the output power supply is interrupted for a short time. The single-wire power supply and the generator are used as input power supplies, the generator is started to work after the single-wire power supply fails, and the generator is switched to supply power through the double-power-supply changeover switch after the generator is started. The power failure time exists in the whole power supply switching process, and the time is about 5-15 seconds. The requirements of railway station signal, dispatching, communication and other equipment on the power supply are high, and the power supply is not allowed to be interrupted. Once the power supply is interrupted, the red light band can be failed, and railway traffic safety accidents can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that falls the electricity among the current single line railway switching power supply process, provided a single line railway power supply safety guarantee device, realized switching the power supply process and did not fall the electricity.
The utility model discloses a following technical scheme realizes:
the single-track railway power supply safety guarantee device is characterized by comprising an input end module, a wide voltage stabilizing module, a voltage transformation module, a filtering module, a bypass module, an STS static selector switch module and an output end module;
the input end module is connected with the wide voltage stabilizing module, respectively receives alternating current power supplies with different systems, and transmits one path of actually received alternating current power supply to the wide voltage stabilizing module according to the actual input condition;
the wide voltage stabilizing module can receive alternating current power supplies with different systems, perform wide voltage stabilization on the received alternating current power supplies with different systems, and finally output stable alternating current power supplies with different systems;
the voltage transformation module is connected to the output end of the wide voltage stabilization module, and the alternating current power supplies with different systems output by the wide voltage stabilization module are arranged according to the following ratio of 180: the voltage transformation ratio of 410 is transformed to output 220V or 380V alternating current power supply;
the filtering module is connected behind the voltage transformation module and is used for filtering the alternating current power supply transmitted by the voltage transformation module;
the STS static transfer switch module is respectively connected with the filtering module and the bypass module, when the wide voltage stabilizing module fails or is overhauled, the STS static transfer switch module can be automatically or manually switched to be powered by the bypass module, the switching time is less than 10ms, and power failure of rear-end equipment cannot be caused;
the bypass module is connected with the input end module and the STS static selector switch, when the wide voltage stabilizing module works, the bypass module is in an open circuit, and when the wide voltage stabilizing module does not work, the bypass module is connected with the input end module and the STS static selector switch module for supplying power;
and the output end module is connected with the STS static selector switch and transmits the current transmitted by the STS static selector switch to the rear-end equipment.
In order to better realize the utility model, further, the input end module is divided into a first input end and a second input end, and both the input ends are provided with a change-over switch which is used for switching the first input end and the second input end to output; the first input end receives different types of alternating current power supplies from a through net and/or a contact net according to actual conditions; the second input receives power from the generator.
In order to better realize the utility model discloses, furtherly, still be provided with the battery pack module on the device, the battery pack module links to each other with broad width voltage stabilizing module, stops the power supply when first input, when changeing to be supplied power by the generator of second input, is supplied power for electrical power generating system by the battery pack module during generator start-up and switching power supply input.
In order to better realize the utility model, further, the wide voltage stabilizing module comprises a PWM rectifying module and an inverting module;
the PWM rectification module rectifies the input alternating current power supplies with different systems into a stable direct current power supply, and then the stable direct current power supply is output to the inversion module through the voltage stabilization of the switching power supply;
the inversion module converts the received direct current power supply into alternating current power supplies with different systems through an SPWM technology and outputs the alternating current power supplies to the transformation module.
In order to better realize the utility model, further, the PWM rectification module comprises an input unit, a filtering voltage-dividing unit, an IGBT unit, an Rcd peak value absorption unit, a driving voltage-limiting unit, a filtering unit and an output end unit;
the bridge rectifier unit adopts a bridge rectifier circuit to rectify alternating current power supplies with different systems into direct current power supplies, and the bridge rectifier circuit adopts a general circuit structure which is not shown in figure 2;
the input unit is connected with the filtering and voltage-dividing unit and receives the rectified unstable direct current circuit;
the filtering voltage division unit and the IGBT module are used for filtering and dividing the unstable direct current power supply sent by the input unit;
the IGBT of the IGBT module is connected with an Rcd peak value absorption unit and a driving voltage limiting unit, and PWM conversion is carried out on the unstable direct-current power supply after filtering and voltage division to generate a stable direct-current power supply;
the filtering unit is connected behind the IGBT unit and is used for filtering the stable direct-current power supply sent by the IGBT unit;
and the output end unit inputs the stable direct current power supply subjected to filtering processing into the inversion module for subsequent processing.
In order to better realize the utility model, further, the inversion module comprises a DSP control unit, a detection feedback unit and a three-phase sine wave pulse width modulation circuit;
the DSP control unit comprises an RAM, a reset circuit, an optical coupling isolation circuit and a DSP single chip microcomputer chip;
the detection feedback unit comprises three detection units, namely a voltage detection unit, a current detection unit and a short circuit detection unit; the detection feedback unit is connected with the DSP singlechip chip and the three-phase sine wave pulse width modulation circuit, and feeds back the voltage, the current and the short circuit condition of the three-phase sine wave pulse width modulation circuit detected by the voltage detection unit, the current detection unit and the short circuit detection unit to the DSP singlechip chip;
the three-phase sine wave pulse width modulation circuit is connected with the detection feedback unit and the DSP control unit, adopts a three-phase bridge circuit and comprises 6 IGBT modules.
In order to realize better the utility model discloses, furtherly, all be provided with current transformer on each line on input module and the output module, when the electric wire netting trouble, can provide electric wire netting system fault current information.
Drawings
FIG. 1 is a general circuit diagram of the present apparatus;
FIG. 2 is a circuit diagram of a voltage stabilizing filter circuit of the PWM module;
FIG. 3 is a circuit diagram of the overall inverter module circuit;
fig. 4 is a control logic diagram of the inverter module.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limitations to the scope of protection. Based on the embodiments in the present invention, all other embodiments obtained by the staff of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the single-track railway power supply safety guarantee device is characterized by comprising an input end module, a wide voltage stabilizing module, a voltage transformation module, a filtering module, a bypass module, an STS static selector switch module and an output end module;
the input end module is connected with the wide voltage stabilizing module, respectively receives alternating current power supplies with different systems, and transmits one path of actually received alternating current power supply to the wide voltage stabilizing module according to the actual input condition;
the wide voltage stabilizing module can receive alternating current power supplies with different systems, perform wide voltage stabilization on the received alternating current power supplies with different systems, and finally output stable alternating current power supplies with different systems;
the voltage transformation module is connected to the output end of the wide voltage stabilization module, and the alternating current power supplies with different systems output by the wide voltage stabilization module are arranged according to the following ratio of 180: the voltage transformation ratio of 410 is transformed to output 220V or 380V alternating current power supply;
the filtering module is connected behind the voltage transformation module and is used for filtering the alternating current power supply transmitted by the voltage transformation module;
the STS static transfer switch module is respectively connected with the filtering module and the bypass module, when the wide voltage stabilizing module fails or is overhauled, the STS static transfer switch module can be automatically or manually switched to be powered by the bypass module, the switching time is less than 10ms, and power failure of rear-end equipment cannot be caused;
the bypass module is connected with the input end module and the STS static selector switch, when the wide voltage stabilizing module works, the bypass module is in an open circuit, and when the wide voltage stabilizing module does not work, the bypass module is connected with the input end module and the STS static selector switch module for supplying power;
and the output end module is connected with the STS static selector switch and transmits the current transmitted by the STS static selector switch to the rear-end equipment.
The working principle is as follows: the input end can receive a single-wire power supply and a generator power supply, wherein the single-wire power supply comprises a contact network power supply and a through wire power supply, the wide voltage stabilizing module can integrate alternating current power supplies of different systems into a direct current, and then the direct current is inverted into alternating current power supplies of different systems, so that the simultaneous power supply of the single-wire power supply and the generator power supply is realized. The voltage transformation module can change the voltage output by the wide voltage stabilization module into the voltage required by the rear-end equipment, and the filtering module can improve the quality of an output power supply; the storage battery pack module can ensure that the system is not powered down in the switching process of the single-wire power supply and the generator power supply; and the STS static transfer switch module and the bypass module can ensure that the back-end equipment can still be continuously and uninterruptedly supplied with power when the wide voltage stabilizing module does not work.
Example 2:
in order to better realize the utility model, further, the input end module is divided into a first input end and a second input end, and both the input ends are provided with a change-over switch which is used for switching the first input end and the second input end to output; the first input end receives different types of alternating current power supplies from a through net and/or a contact net according to actual conditions; the second input receives power from the generator.
The working principle is as follows: the first input end is provided with a power supply access circuit which can receive different power supplies from a contact net and a through wire; the second input end is provided with a power supply access circuit for receiving power supply provided by the generator; through change over switch, can realize the switching of first input and second input power supply, when first input does not have the power supply, switch into the power supply that the second input received the generator through change over switch to the stability and the reliability of power supply have been promoted greatly.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in order to realize better the utility model discloses, furtherly, still be provided with the battery pack module on the device, the battery pack module links to each other with broad width voltage stabilizing module, stops the power supply when first input, when changeing to be supplied power by the generator of second input, is supplied power for electrical power generating system by the battery pack module during generator start-up and switching power supply input to guarantee that the switching process does not fall the electricity.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
in order to better realize the utility model, further, the wide voltage stabilizing module comprises a PWM rectifying module and an inverting module;
the PWM rectification module rectifies the input alternating current power supplies with different systems into a stable direct current power supply, and then the stable direct current power supply is output to the inversion module through the voltage stabilization of the switching power supply;
the inversion module converts the received direct current power supply into alternating current power supplies with different systems through an SPWM technology and outputs the alternating current power supplies to the transformation module.
The other parts of this embodiment are the same as those of embodiments 1 to 3, and thus are not described again.
Example 5:
in order to better realize the present invention, as shown in fig. 2, further, the main circuit of the PWM rectifier module includes a bridge rectifier unit, an input unit, a filtering voltage divider unit, an IGBT unit, an Rcd peak absorption unit, a filtering unit, and an output end unit;
the bridge rectifier unit adopts a bridge rectifier circuit to rectify alternating current power supplies with different systems into direct current power supplies, and the bridge rectifier circuit adopts a general circuit structure which is not shown in figure 2;
the input unit is connected with the filtering and voltage-dividing unit and receives the rectified unstable direct current circuit;
the filtering voltage division unit and the IGBT module are used for filtering and dividing the unstable direct current power supply sent by the input unit;
the IGBT of the IGBT module is connected with an Rcd peak value absorption unit and a driving voltage limiting unit, and PWM conversion is carried out on the unstable direct-current power supply after filtering and voltage division to generate a stable direct-current power supply;
the filtering unit is connected behind the IGBT unit and is used for filtering the stable direct-current power supply sent by the IGBT unit;
and the output end unit inputs the stable direct current power supply subjected to filtering processing into the inversion module for subsequent processing.
The working principle is as follows: as shown in fig. 2:
i09, I10, I11 and I12 which are output end units which are ports for outputting direct current power after PWM processing power and connecting the direct current power to an inverter module;
i13, I14, I15 and I16 which are input units and are connected with the port of an input end power supply which is rectified and input into the PWM rectification module after input transformation, lightning protection and filtering;
4. 6, the port is a control power supply unit which inputs the contact network power supply to the PWM rectification module after passing through the control transformer;
9. 12, the port is a control power supply unit which is directly input to the PWM rectification module for a through wire power supply;
i17 and I18, the port is a double-power transfer switch power supply;
e1, E3, C1, C4, R2 and R5 form a filtering voltage division unit and play a role in filtering and voltage division;
c2, D1 and R1 form an Rcd peak absorption unit;
r3, Z1 and Z2 are driving voltage limiting units;
q1 and D2 are IGBT modules;
l1, E2, C3 and R4 are filter units;
when alternating current power supplies with different standards are converted into direct current power supplies through a bridge circuit, the alternating current power supplies are unstable and have low quality, and the direct current power supplies with stable and high quality can be obtained by performing filtering and voltage stabilization through the circuit shown in fig. 2.
The other parts of this embodiment are the same as those of embodiments 1 to 4, and therefore, the description thereof is omitted.
Example 6:
in order to better realize the utility model, further, the inversion module comprises a DSP control unit, a detection feedback unit and a three-phase sine wave pulse width modulation circuit;
the DSP control unit comprises an RAM, a reset circuit, an optical coupling isolation circuit and a DSP single chip microcomputer chip;
the detection feedback unit comprises three detection units, namely a voltage detection unit, a current detection unit and a short circuit detection unit; the detection feedback unit is connected with the DSP singlechip chip and the three-phase sine wave pulse width modulation circuit, and feeds back the voltage, the current and the short circuit condition of the three-phase sine wave pulse width modulation circuit detected by the voltage detection unit, the current detection unit and the short circuit detection unit to the DSO singlechip chip;
the three-phase sine wave pulse width modulation circuit is connected with the detection feedback unit and the DSP control unit, adopts a three-phase bridge circuit and comprises 6 IGBT modules.
The working principle is as follows: the DSP control unit comprises an RAM, a reset circuit, an optical coupling isolation circuit and a DSP single chip microcomputer chip; as can be seen from fig. 3, the detection feedback unit is connected with six IGBT modules of the three-phase sine wave pulse width modulation circuit and the DSP single chip microcomputer chip; the detection feedback unit detects the PWM rectification module through the detection units of current, voltage and short circuit and feeds back a detection result to the DSP singlechip chip, wherein the current detection unit is connected with an AD1 end of the DSP, the voltage detection unit is connected with an AD2 end of the DSP singlechip chip, and the short circuit detection unit is connected with a PWM blocking end of the DSP singlechip chip; the DSP is respectively connected with the six IGBT modules through SPWM1-6 ports to control and generate a single/three-phase alternating current power supply; as shown in fig. 4, the DSP module further includes an optical coupling isolation circuit, a reset circuit, a RAM, and other units, which are conventional in the art and therefore are not specifically shown in fig. 3.
The other parts of this embodiment are the same as those of embodiments 1 to 5, and thus are not described again.
Example 7:
in order to realize better the utility model discloses, furtherly, all be provided with current transformer on each line on input module and the output module, when the electric wire netting trouble, can provide electric wire netting system fault current information.
The other parts of this embodiment are the same as those of embodiments 1 to 6, and thus are not described again.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (7)
1. The single-track railway power supply safety guarantee device is characterized by comprising an input end module, a wide voltage stabilizing module, a voltage transformation module, a filtering module, a bypass module, an STS static selector switch module and an output end module;
the input end module is connected with the wide voltage stabilizing module, respectively receives alternating current power supplies with different systems, and transmits one path of actually received alternating current power supply to the wide voltage stabilizing module according to the actual input condition;
the wide voltage stabilizing module can receive alternating current power supplies with different systems, perform wide voltage stabilization on the received alternating current power supplies with different systems, and finally output stable alternating current power supplies with different systems;
the voltage transformation module is connected to the output end of the wide voltage stabilization module, and the alternating current power supplies with different systems output by the wide voltage stabilization module are arranged according to the following ratio of 180: the voltage transformation ratio of 410 is transformed to output 220V or 380V alternating current power supply;
the filtering module is connected behind the voltage transformation module and is used for filtering the alternating current power supply transmitted by the voltage transformation module;
the STS static transfer switch module is respectively connected with the filtering module and the bypass module, when the wide voltage stabilizing module fails or is overhauled, the STS static transfer switch module can be automatically or manually switched to be powered by the bypass module, the switching time is less than 10ms, and power failure of rear-end equipment cannot be caused;
the bypass module is connected with the input end module and the STS static selector switch, when the wide voltage stabilizing module works, the bypass module is in an open circuit, and when the wide voltage stabilizing module does not work, the bypass module is connected with the input end module and the STS static selector switch module for supplying power;
and the output end module is connected with the STS static selector switch and transmits the current transmitted by the STS static selector switch to the rear-end equipment.
2. The single-track railway power supply safety guarantee device as claimed in claim 1, wherein the input end module is divided into a first input end and a second input end, and a change-over switch is arranged on each of the first input end and the second input end and is used for switching the first input end and the second input end to output; the first input end receives alternating current power supplies of different systems from a through network or a contact network according to actual conditions; the second input receives power from the generator.
3. A single line railway power supply safety device as claimed in claim 2, wherein the device is further provided with a battery module, the battery module is connected with the wide voltage stabilizing module, and when the first input end stops supplying power and the power is supplied by the generator at the second input end, the battery module supplies power to the power supply system during the period of starting and switching the power supply input end of the generator.
4. The single-track railway power supply safety guarantee device as claimed in claim 1, wherein the wide voltage stabilizing module comprises a PWM rectifying module and an inverting module;
the PWM rectification module rectifies the input alternating current power supplies with different systems into a stable direct current power supply, and then the stable direct current power supply is output to the inversion module through the voltage stabilization of the switching power supply;
the inversion module converts the received direct current power supply into alternating current power supplies with different systems through an SPWM technology and outputs the alternating current power supplies to the transformation module.
5. The single-track railway power supply safety guarantee device as claimed in claim 4, wherein the PWM rectification module comprises a bridge rectification unit, an input unit, a filter unit, an IGBT unit, an Rcd peak absorption unit, a driving voltage limiting unit, a filter unit and an output end unit;
the bridge rectifier unit adopts a bridge rectifier circuit to rectify alternating current power supplies with different systems into unstable direct current power supplies;
the input unit is connected with the filtering unit and receives the rectified unstable direct current power supply;
the filtering unit and the IGBT module are used for filtering the unstable direct current power supply sent by the input unit;
the IGBT of the IGBT module is connected with a Rcd peak value absorption unit and a driving voltage limiting unit, and PWM conversion is carried out on the filtered unstable direct-current power supply to generate a stable direct-current power supply;
the filtering unit is connected behind the IGBT unit and is used for filtering the stable direct-current power supply sent by the IGBT unit;
and the output end unit inputs the stable direct current power supply subjected to filtering processing into the inversion module for subsequent processing.
6. The single track railway power supply safety guarantee device as claimed in claim 4, wherein the inverter module comprises a DSP control unit, a detection feedback unit, and a three-phase sine wave pulse width modulation circuit;
the DSP control unit comprises an RAM, a reset circuit, an optical coupling isolation circuit and a DSP single chip microcomputer chip;
the detection feedback unit comprises three detection units, namely a voltage detection unit, a current detection unit and a short circuit detection unit; the detection feedback unit is connected with the DSP singlechip chip and the three-phase sine wave pulse width modulation circuit, and feeds back the voltage, the current and the short circuit condition of the three-phase sine wave pulse width modulation circuit detected by the voltage detection unit, the current detection unit and the short circuit detection unit to the DSP singlechip chip;
the three-phase sine wave pulse width modulation circuit is connected with the detection feedback unit and the DSP control unit, adopts a three-phase bridge circuit and comprises 6 IGBT modules.
7. The single-track railway power supply safety guarantee device as claimed in claim 1, wherein a current transformer is arranged on each line of the input end module and the output end module, and fault current information of a power grid system can be provided when a power grid fails.
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Denomination of utility model: A security device for power supply of single track railway Effective date of registration: 20220520 Granted publication date: 20200519 Pledgee: Bank of Chengdu science and technology branch of Limited by Share Ltd. Pledgor: SICHUAN YOULIYUAN ELECTRIC TECHNOLOGY Co.,Ltd. Registration number: Y2022980006059 |
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