CN109655654A - A kind of Super-Current Measurement method and device based on by-pass shunt technology - Google Patents
A kind of Super-Current Measurement method and device based on by-pass shunt technology Download PDFInfo
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- CN109655654A CN109655654A CN201910040881.2A CN201910040881A CN109655654A CN 109655654 A CN109655654 A CN 109655654A CN 201910040881 A CN201910040881 A CN 201910040881A CN 109655654 A CN109655654 A CN 109655654A
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- 230000036760 body temperature Effects 0.000 claims 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides a kind of Super-Current Measurement method and device based on by-pass shunt technology, described device includes leading body, shunt conductor, current transformer, temperature sensor and processor, described device by leading body it is in parallel with shunt conductor after seal in current loop, then mutual inductor sample shunt conductor loop current is utilized, realizes and small current measurement is converted to by Super-Current Measurement；The method includes heavy-current measuring device is accessed circuit loop, further includes: carries out intensive discrete shunting experiment, forms experimental project database；The current value and experimental project database detected according to heavy-current measuring device, counter circuit current value.The present invention comprehensively considers the influence of ambient temperature, temperature rise of conductor to conductor resistance rate, reduce influence of the temperature rise to shunt conductor, reliability is higher, error is smaller, and greatly reduce mutual inductor size, measurement dynamic range is improved, the easy saturability of mutual inductor is reduced, reaches and more preferably measure purpose.
Description
Technical field
The present invention relates to Super-Current Measurement technical fields, and in particular to a kind of Super-Current Measurement based on by-pass shunt technology
Method and device.
Background technique
With the development of current detection technology, more and more Super-Current Measurement methods are come into being.It is currently used big
Electric current detecting method is resistive shunting and mutual inductor sample method.Resistive shunting is by resistive shunting device, such as Precise Alloy
Resistor, manganese-nickel alloy resistor rod, copper strips etc. measure electric current using series system using Ohm's law, and advantage is
The high and low deviation of precision, the disadvantage is that the power consumption that can not be provided for electrical isolation and Low Drift Temperature, when measuring high current on resistor is larger,
Temperature increases, and burn device may be fluctuated because of of short duration peak point current.Mutual inductor sample is owned by France in the detection method based on magnetic field,
This detection method has many advantages, such as good isolation and lower power loss, therefore in actuation techniques and high current field quilt
It is widely applied, but the disadvantage is that volume is larger, narrow dynamic range is easily saturated, and compensation characteristic, linear and temperature characterisitic are undesirable.
Application No. is 200920010019.9 utility model patents to disclose a kind of big electricity of small current mutual inductor detection
The electronic control unit of stream utilizes existing zero sequence current mutual inductor, the detection of the small current mutual inductors such as residual current transformer
High current in the load wire with impedance line parallel connection very thin, very short relative to load wire, plays and shunts work in proportion
With being equipped with highly sensitive electronic control circuit, can have the advantages that structure is simple, saving material with output protection signal.But
It is that, because high current will cause the rising of load temperature, the device of the utility model does not account for temperature to load resistor value
It influences, Super-Current Measurement precision is not high.
Disclosing application No. is 201620763677.5 utility model patent has temperature-compensating under a kind of hot environment
Super-Current Measurement circuit, including electric thermo-couple temperature measurement module, step voltage measurement module, MCU communication and ADC sample mould
Block, RS485 transmission conversion module, power module and host computer, the MCU communication and ADC sampling module pass through ADC sampling end
This is not connected with galvanic couple temperature-measuring module and step voltage measurement module mouth, while the serial ports of MCU communication and ADC sampling module
The serial ports receiving end of transmitting terminal and RS485 transmission conversion module is connected, RS485 transmit conversion module pass through serial ports transmitting terminal with it is upper
Voltage transformation and High Precision Low Temperature are floated elegant rear supply MCU communication and ADC sampling module by position machine connection, power module.The electricity
Road realizes the Super-Current Measurement technology under hot environment with temperature compensation function, improves the measurement accuracy and survey of high current
Real-time is measured, has the advantages that data transmission is reliable, low in cost, be easily achieved.But in the pass for considering resistance and temperature
It when being, is defaulted as being linear relationship between temperature and resistance, and is not stringent linear pass actually between temperature and resistance
System, and the factor for influencing resistance not only includes resistance temperature, is also had with electric current, environment temperature, the conductor material for flowing through resistance
It closes, therefore, the precision needs of the utility model further increase.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of Super-Current Measurement method based on by-pass shunt technology and
Device comprehensively considers the various factors for influencing conductor resistance value, higher to the measurement accuracy of high current.
A kind of Super-Current Measurement method based on by-pass shunt technology, comprising: return heavy-current measuring device access circuit
Road, further includes:
Intensive discrete shunting experiment is carried out, experimental project database is formed；
The current value and experimental project database detected according to heavy-current measuring device, counter circuit current value.
Preferably, the heavy-current measuring device includes leading body, shunt conductor, current transformer, temperature sensor
And processor.
Any of the above-described scheme is preferably, and the leading body is fixedly connected with the shunt conductor using parallel form, institute
State leading body series connection access circuit loop.
Any of the above-described scheme is preferably, and the current transformer is connect with the shunt conductor, is led for acquiring to shunt
Intracorporal current value.
Any of the above-described scheme is preferably, and the temperature sensor includes leading temperature sensor, shunt conductor temperature
Sensor and environment temperature sensor.
Any of the above-described scheme is preferably, and the leading temperature sensor contacts fixation with the leading body, for examining
Survey the leading temperature.
Any of the above-described scheme is preferably, and the shunt conductor temperature sensor contacts fixation with the shunt conductor, is used
In the detection shunt conductor temperature.
Any of the above-described scheme is preferably, and the environment temperature sensor is for detecting environment temperature, far from leading body
And shunt conductor setting, it is sufficiently contacted with ambient air outside, reduces the influence that temperature rise of conductor generates it.
Any of the above-described scheme is preferably, and the temperature sensor, the current transformer are connected to the processor.
Any of the above-described scheme is preferably, and the leading body is metallic conductor uniform in material, the shunt conductor and institute
It is identical or different to state leading body material.
Any of the above-described scheme is preferably, by adjusting in the shape of the shunt conductor, length, sectional area, material
At least one changes the shunting ratio of the shunt conductor Yu the leading body.
Any of the above-described scheme is preferably, and carrying out the intensive discrete device for shunting experiment includes: strong current generator, temperature
Instrument, current transformer, circuit resistance tester and equipments of recording.
Any of the above-described scheme is preferably, and is carried out intensive discrete shunting experiment, is formed experimental project database, including step
It is rapid:
S11, selected leading body and shunt conductor；
S12, by leading body it is in parallel with shunt conductor after, connect to form circuit loop with strong current generator；
S13, setting strong current generator generate fixed current value；
After S14, the detection leading temperature reach steady temperature, shunt conductor current value is sampled；
S15, the impedance value for measuring leading body；
S16, record data, material, conductor outer dimension including leading body and shunt conductor, conductor steady temperature, ring
Current value and split ratio, the leading body and shunting of electric current, leading body and shunt conductor that border temperature, strong current generator generate are led
The impedance value of body and the penalty coefficient determined by above-mentioned data；
S17, change the fixed current value that strong current generator generates, repeat step S14~S16；
S18, change leading body and/or shunt conductor, repeat step S11~S17；
S19, the data of record are formed into experimental project database.
Any of the above-described scheme is preferably, and is combined for same leading body and shunt conductor, and strong current generator generates
Current value should be within the scope of 3000A, and multiple repairing weld in the range.
Any of the above-described scheme is preferably, and in step S14, current transformer is connect with shunt conductor, and sampling is shunted and led
Body current value.
Any of the above-described scheme is preferably, and in step S14, the thermometric instrument is arranged on the leading body, detects institute
State leading body temperature change.
Any of the above-described scheme is preferably, and in step S15, measures leading body impedance value using circuit resistance tester.
Any of the above-described scheme is preferably, and in step S16, measures environment temperature using thermometric instrument.
Any of the above-described scheme is preferably, and in step S16, the conductor outer dimension includes conductor length and sectional area.
Any of the above-described scheme is preferably, and records the intensive discrete each item number shunted in experiment using the equipments of recording
According to.
Any of the above-described scheme is preferably, the current value and experimental project data detected according to high-current detector
Library, counter circuit current value, comprising steps of
S31: current transformer detects shunt conductor current value；
S32: according to leading body, the material of shunt conductor, the outer dimension of conductor, temperature rise of conductor, environment temperature, described
Penalty coefficient is searched in experimental project database；
S33: the penalty coefficient found and conductor size, temperature rise are brought into shunting formula, calculates split ratio, is returned
Road current value.
Any of the above-described scheme preselects, in step S23, the shunting formula are as follows:Wherein I indication circuit circuit total current, I1
Indicate the divided electric current of shunt conductor, ρ1、ρ0、T1、L1、S1、α1Respectively shunt conductor resistivity, 0 DEG C of resistivity, steady temperature,
Length, sectional area and penalty coefficient；ρ2、ρ0′、T2、L2、S2、α2Respectively leading body resistivity, 0 DEG C of resistivity, steady temperature,
Length, sectional area and penalty coefficient.
Another aspect of the present invention provides a kind of heavy-current measuring device based on by-pass shunt technology, including leading body,
Shunt conductor and current transformer further include temperature sensor and processor.
Any of the above-described scheme is preferably, and the leading body is fixedly connected with the shunt conductor using parallel form, institute
State leading body series connection access circuit loop.
Any of the above-described scheme is preferably, and the current transformer is connect with the shunt conductor, is led for acquiring to shunt
Intracorporal current value.
Any of the above-described scheme is preferably, and the temperature sensor includes leading temperature sensor, shunt conductor temperature
Sensor and environment temperature sensor.
Any of the above-described scheme is preferably, and the leading temperature sensor contacts fixation with the leading body, for examining
Survey the leading temperature.
Any of the above-described scheme is preferably, and the shunt conductor temperature sensor contacts fixation with the shunt conductor, is used
In the detection shunt conductor temperature.
Any of the above-described scheme is preferably, and the environment temperature sensor is for detecting environment temperature, far from leading body
And shunt conductor setting, it is sufficiently contacted with ambient air outside, reduces the influence that temperature rise of conductor generates it.
Any of the above-described scheme is preferably, and the temperature sensor, the current transformer are connected to the processor.
Any of the above-described scheme is preferably, and the leading body is metallic conductor uniform in material, the shunt conductor and institute
It is identical or different to state leading body material.
Any of the above-described scheme is preferably, by adjusting in the shape of the shunt conductor, length, sectional area, material
At least one changes the shunting ratio of the shunt conductor Yu the leading body.
Any of the above-described scheme is preferably, and the experimental project database is provided in the processor, according to leading body,
The material of shunt conductor, the outer dimension of conductor, temperature rise of conductor, environment temperature are searched in the experimental project database and are mended
Coefficient is repaid, split ratio is calculated, circuit electricity is then obtained according to the current value in the collected shunt conductor of the current transformer
Flow valuve.
Ambient temperature, temperature rise of conductor are comprehensively considered using the Super-Current Measurement method of the invention based on by-pass shunt technology
Influence to conductor resistance rate, described device by leading body it is in parallel with shunt conductor after seal in current loop, then utilize mutual inductance
Device samples shunt conductor loop current, realizes and is converted to small current measurement by Super-Current Measurement.The present invention not only reduces temperature rise
Influence to shunt conductor, reliability is higher, and error is smaller, and greatly reduces mutual inductor size, improves measurement
Dynamic range reduces the easy saturability of mutual inductor, reaches and more preferably measure purpose.
Detailed description of the invention
Fig. 1 is the process of a preferred embodiment of the Super-Current Measurement method according to the invention based on by-pass shunt technology
Schematic diagram.
Fig. 2 is the embodiment as shown in Figure 1 of the Super-Current Measurement method according to the invention based on by-pass shunt technology
Carry out the intensive discrete flow diagram for shunting experiment and forming a preferred embodiment of experimental project database.
Fig. 3 is the embodiment as shown in Figure 1 of the Super-Current Measurement method according to the invention based on by-pass shunt technology
The structural schematic diagram of the intensive discrete preferred embodiment for shunting experimental provision.
Fig. 4 is the structure of a preferred embodiment of the heavy-current measuring device according to the invention based on by-pass shunt technology
Schematic diagram.
Specific embodiment
For a better understanding of the present invention, the present invention will be described in detail below with reference to specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of Super-Current Measurement method based on by-pass shunt technology, comprising steps of
S1, intensive discrete shunting experiment is carried out, forms experimental project database；
S2, heavy-current measuring device is accessed into circuit loop；
S3, the current value and experimental project database detected according to big electrical quantity measurement arrangement, counter circuit current value.
Under normal circumstances, in the little range of temperature change, the resistivity of conductor makees linear change with temperature, i.e. and ρ=
ρ0(1+at), t is Celsius temperature, ρ in formula0Resistivity when being 0 DEG C, a are temperature coefficient of resistivity, but for there is high current
The conductor flowed through, the power consumption on conductor is big, and Wen Shenggao, the relationship between conductor resistance rate and temperature is become by simple linear relationship
For non-linear relation, and the temperature rise situation of conductor and conductive material, flow through conductor electric current size, environment temperature fluctuation
There are close relationship, therefore the conductor for there is high current to flow through, the non-linear relation between conductor resistance rate and conductor temperature
It is increasingly complex.To determine conductor resistance rate and conductor material, environment temperature, the current value and conductor flowed through as accurately as possible
Relationship between temperature rise situation carries out intensive discrete shunting experiment.
As shown in Figures 2 and 3, in step S1, carrying out the intensive discrete device for shunting experiment includes strong current generator, temperature
Spending instrument, current transformer, circuit resistance tester and equipments of recording, the thermometric instrument includes leading body thermometric instrument and ring
Border thermometric instrument carries out intensive discrete shunting experiment, forms experimental project database, detailed process are as follows:
S11, selected leading body and shunt conductor；
S12, by leading body it is in parallel with shunt conductor after, connect to form circuit loop with strong current generator；In the master
The leading body thermometric instrument is fixedly connected on conductor, it, will be described for acquiring the temperature rise situation of leading body in experimentation
Current transformer is connect with the shunt conductor, for detecting the current value by shunt conductor；Environment temperature instrument is far from institute
Leading body is stated, for monitoring experimental situation temperature；
S13, setting strong current generator generate fixed current value；
S14, after reaching steady temperature by the leading body thermometric instrument detection leading temperature, the electricity is used
Current transformer samples shunt conductor current value；
S15, the impedance value that leading body is measured using circuit resistance tester；
S16, data are recorded using the equipments of recording, including conductive material, the conductor outer dimension (length including conductor
And sectional area), conductor steady temperature, environment temperature, strong current generator generate current value, leading body and shunt conductor electricity
The impedance value of flow valuve and split ratio, leading body and shunt conductor and the penalty coefficient determined by above-mentioned data；
S17, change the fixed current value that strong current generator generates, repeat step S14~S16；
S18, change leading body and/or shunt conductor, repeat step S11~S17；
S19, the Data Integration of record is formed into experimental project database.
It is combined for same leading body and shunt conductor, the current value that strong current generator generates should be in 3000A range
It is interior, and multiple repairing weld in the range, such as using 1A and/or 3A and/or 5A and/or 10A as the sampling interval, tested.Note
Record temperature rise situation of the different conductor material under different current values, the current value of leading body and shunt conductor and split ratio, leading
The parameters such as the impedance value of body and shunt conductor.To lot of experimental data carry out analysis find with the increase of discrete electrical flow valuve with
And significant change can occur for the fluctuation of environment temperature, temperature rise of conductor, impedance, shunting ratio error can also increase with it, so as to cause
It is non-linear when linearly becoming high current when divided relation between shunt conductor and leading body is from low current, therefore according to reality
The data for testing record determine resistance of the different conductor material under different steady temperatures, further determine that different conductor different steady
All record data including penalty coefficient are formed experimental project database by penalty coefficient at a temperature of state.
Heavy-current measuring device of the invention is accessed into circuit loop, the electric current of circuit loop is measured.Such as Fig. 4 institute
Show, described device includes leading body, shunt conductor, current transformer, leading temperature sensor, shunt conductor temperature sensing
Device, environment temperature sensor and processor, the leading body are fixedly connected with the shunt conductor using parallel form, the master
Conductor series connection accesses circuit loop, and the leading body is metallic conductor uniform in material, the shunt conductor and the leading body
Material is identical or different；The current transformer is connect with the shunt conductor, for acquiring the current value in shunt conductor；Institute
It states leading temperature sensor and contacts fixation with the leading body, for detecting the leading temperature, the shunt conductor temperature
It spends sensor and contacts fixation with the shunt conductor, for detecting the shunt conductor temperature, the environment temperature sensor is used
In detection environment temperature, it is arranged far from leading body and shunt conductor, is sufficiently contacted with ambient air outside, reduces temperature rise of conductor
The influence that it is generated；The leading temperature sensor, the shunt conductor temperature sensor, environment temperature sensing
Device, the current transformer are connected to the processor.The experimental project database is provided in the processor.
Current value in collected shunt conductor is sent to the processor, the leading body by the current transformer
Collected temperature information is sent to the processing by temperature sensor, shunt conductor temperature sensor and environment temperature sensor
Device, the processor according to the shunt conductor current value and temperature information received, in conjunction with leading body, shunt conductor material,
The outer dimension of conductor searches penalty coefficient in the experimental project database, to the resistivity of leading body and shunt conductor
It compensates, and then calculates split ratio, circuit is obtained according to the current value in the collected shunt conductor of the current transformer
Current value.The processor is according to formula Meter
Point counting stream when loop current value, I indication circuit circuit total current in formula, I1Indicate the divided electric current of shunt conductor, ρ1、ρ0、T1、
L1、S1、α1Respectively shunt conductor resistivity, 0 DEG C of resistivity, steady temperature, length, sectional area and penalty coefficient；ρ2、ρ0′、
T2、L2、S2、α2Respectively leading body resistivity, 0 DEG C of resistivity, steady temperature, length, sectional area and penalty coefficient.
It, can be by adjusting the shape, length, section of the shunt conductor during to circuit loop Super-Current Measurement
At least one of product, material, change the shunting ratio of the shunt conductor Yu the leading body, Super-Current Measurement are converted to
Small current measurement, and make the electric current for flowing through the shunt conductor in the range ability of the current transformer.
Embodiment 2
Super-Current Measurement method and device based on by-pass shunt technology of the invention can be applied to low and medium voltage distribution network
The detection of middle high current, the heavy-current measuring device of the invention based on by-pass shunt technology, leading body are uniform in material
Metallic conductor need to determine its impedance in different current levels lower conductors, temperature rise situation of change in advance, determine not sympathizing with for its
Resistivity penalty coefficient under condition.When carrying out Super-Current Measurement, leading body is connected and accesses power grid circuit.Due to without leading
It is passed to current transformer, therefore the limitation not stringent to the shape of the leading body on body, can reduce institute to a certain extent
The volume of measuring device is stated, measuring device miniaturization is realized, improves space utilization rate.Shunt conductor be and the same material of leading body
Or unlike material, it is in parallel with leading body, by least one of shape to shunt conductor, length, sectional area, material into
Row adjustment, changes the shunting ratio of the shunt conductor Yu the leading body, as long as making the resistance value of shunt conductor by adjusting
Greater than the resistance value of leading body, the time Super-Current Measurement can be converted into small current measurement, by penetrating the shunt conductor
Current transformer directly measure the low current in shunt conductor, the current value in available entire power grid circuit, because directly
It measures the low current value in shunt conductor and the split ratio of shunt conductor and leading body can be with dynamic regulation, so current transformer
Size also become smaller therewith, and be not susceptible to magnetic saturation phenomenon, improve measurement dynamic range.
It should be noted that the above examples are only used to illustrate the technical scheme of the present invention, rather than its limitations；Although preceding
Stating embodiment, invention is explained in detail, it should be appreciated by those skilled in the art: it can be to previous embodiment
The technical solution of record is modified, or equivalent substitution of some or all of the technical features, and these are replaced,
The range for technical solution of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of Super-Current Measurement method based on by-pass shunt technology, comprising: heavy-current measuring device is accessed into circuit loop,
It is characterized by also including:
Intensive discrete shunting experiment is carried out, experimental project database is formed；
The current value and experimental project database detected according to heavy-current measuring device, counter circuit current value.
2. as described in claim 1 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the high current
Measuring device includes leading body, shunt conductor, current transformer, temperature sensor and processor.
3. as claimed in claim 2 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the leading body
It is fixedly connected with the shunt conductor using parallel form, the leading body series connection access circuit loop.
4. as claimed in claim 3 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the electric current is mutual
Sensor is connect with the shunt conductor, for acquiring the current value in shunt conductor.
5. as claimed in claim 4 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the temperature passes
Sensor includes leading temperature sensor, shunt conductor temperature sensor and environment temperature sensor.
6. as claimed in claim 5 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the leading body
Temperature sensor contacts fixation with the leading body, for detecting the leading temperature；The shunt conductor temperature sensor
Fixation is contacted with the shunt conductor, for detecting the shunt conductor temperature；The environment temperature sensor is for detecting ring
Border temperature is arranged far from leading body and shunt conductor, sufficiently contacts with ambient air outside, reduces temperature rise of conductor and generates to it
Influence.
7. as claimed in claim 3 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: the leading body
For metallic conductor uniform in material, the shunt conductor and the leading body material are identical or different.
8. as described in claim 1 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: carry out intensively from
Dissipating the device for shunting and testing includes: strong current generator, thermometric instrument, current transformer, circuit resistance tester and record work
Tool.
9. as claimed in claim 8 based on the Super-Current Measurement method of by-pass shunt technology, it is characterised in that: carry out intensively from
It dissipates and shunts experiment, form experimental project database, comprising steps of
S11, selected leading body and shunt conductor；
S12, by leading body it is in parallel with shunt conductor after, connect to form circuit loop with strong current generator；
S13, setting strong current generator generate fixed current value；
After S14, the detection leading temperature reach steady temperature, shunt conductor current value is sampled；
S15, the impedance value for measuring leading body；
S16, record data, material, conductor outer dimension, conductor steady temperature, environment temperature including leading body and shunt conductor
Electric current that degree, strong current generator generate, the current value and split ratio of leading body and shunt conductor, leading body and shunt conductor
Impedance value and the penalty coefficient determined by above-mentioned data；
S17, change the fixed current value that strong current generator generates, repeat step S14 ~ S16；
S18, change leading body and/or shunt conductor, repeat step S11 ~ S17；
S19, the data of record are formed into experimental project database.
10. a kind of heavy-current measuring device based on by-pass shunt technology, including leading body, shunt conductor and current transformer,
It is characterized by also including temperature sensors and processor, using such as described in any item measurement methods of claim 1-9.
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| CN201910040881.2A CN109655654B (en) | 2019-01-16 | 2019-01-16 | High-current measurement method and device based on bypass shunt technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763779A (en) * | 2021-01-28 | 2021-05-07 | 湖北三江航天红峰控制有限公司 | Device for enlarging detection range of current sensor |
| CN113884960A (en) * | 2020-07-02 | 2022-01-04 | 广州雷迅创新科技股份有限公司 | High-precision calibration method for current measured by shunt method |
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Denomination of invention: A high current measurement method and device based on bypass diversion technology Effective date of registration: 20231128 Granted publication date: 20231020 Pledgee: Bank of Nanjing Co.,Ltd. Jiangning sub branch Pledgor: JIANGSU QIHOU INTELLIGENT ELECTRICAL EQUIPMENT CO.,LTD. Registration number: Y2023980067709 |