CN111585358A - Multi-type single-winding coil power supply measurement integrated device special for microcomputer protection - Google Patents
Multi-type single-winding coil power supply measurement integrated device special for microcomputer protection Download PDFInfo
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- CN111585358A CN111585358A CN202010628822.XA CN202010628822A CN111585358A CN 111585358 A CN111585358 A CN 111585358A CN 202010628822 A CN202010628822 A CN 202010628822A CN 111585358 A CN111585358 A CN 111585358A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
Abstract
The invention discloses a multi-type single-winding coil power supply and measurement integrated device special for microcomputer protection, which relates to the field of power transmission and distribution. The power supply method automatically matches the corresponding power supply modes according to the difference of the output parameters of the open type coil, the core-through type coil and the pouring type coil; the secondary current output by the coil is reliable in precision by adopting the technologies of collecting the turn ratio of the coil, filtering and the like; compensating insufficient power supply during low current starting by adopting a chargeable and dischargeable energy storage super capacitor; and the dynamic nonlinear compensation technology is adopted to compensate the deficiency of the measurement current output when the coil is used as power supply.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to a power supply and measurement integrated device special for a microcomputer protection multi-type single-winding coil.
Background
The microcomputer protection device is a measurement and control protection device widely used in the field of power transmission and distribution in recent 20 years, and simplifies the procedures and the components of relay protection while inheriting the functions of voltage and current protection, monitoring, alarming, self-checking and the like of the relay protection, so that the microcomputer protection device is more precise, accurate and economical in the protection process, and is more convenient to install and control in a flexible and simple operation mode. The microcomputer protection adopts a mode that a high-voltage coil is utilized to convert primary current into secondary current and the secondary current is input to a measurement current sampling terminal of the microcomputer protection for current measurement, a power supply source of the microcomputer protection adopts a power supply mode of auxiliary power supplies such as a UPS, a direct current screen or a storage battery for power supply, and auxiliary equipment such as the high-voltage coil, the UPS, the direct current screen or the storage battery is required to be equipped in a set of protection system.
Conventional microcomputer protection devices are generally classified into active microcomputer protection and passive microcomputer protection. The active microcomputer protection generally needs to select a UPS, a direct current screen or a storage battery as a power supply, adopt a single-winding coil or a double-winding coil as current measurement input, adopt a single-winding mode as measurement current generally, and adopt a double-winding mode as measurement current and metering current; under the general condition of passive microcomputer protection, equipment such as a UPS, a direct current screen or a storage battery and the like can be omitted as a power supply source of the passive microcomputer protection, but the requirement on a coil is high, the specification of the coil is generally required to adopt an open type or core penetrating type coil, at least double windings are adopted, one winding is used for supplying power, the other winding is used for measuring, the material for manufacturing the coil is added, meanwhile, the coil is required to be customized according to the requirement, the process for manufacturing the coil is added, and certain limitation is realized. Therefore, the power supply and measurement integrated device for the multi-type single-winding coil specially used for microcomputer protection is provided.
Disclosure of Invention
Based on the technical problems existing in the background technology, the invention provides a power supply and measurement integrated device for a plurality of types of single-winding coils specially used for microcomputer protection, which has the characteristics of receiving the signal output of the single-winding coil, processing the signal inside the single-winding coil, simultaneously providing power supply input and measurement input for the microcomputer protection device, ensuring the normal power supply of the microcomputer protection device, simultaneously providing secondary measurement current input for the microcomputer protection device, and ensuring the reliable operation of the microcomputer protection.
The invention provides the following technical scheme: the power supply and measurement integrated device for the multi-type single-winding coil special for microcomputer protection comprises a multi-type single-winding coil power supply module, a multi-type single-winding coil measurement module, a power supply automatic compensation module and a current automatic compensation module;
the power supply mode switching module in the multi-type single-winding coil power supply module selects one power supply mode from multiple power supply modes according to the type of the single-winding coil to supply power and output, and outputs a stable power supply to be used by a microcomputer protection device through a power supply output interface;
the multi-type single-winding coil measuring module collects the coil turn ratio when a single-winding signal is input through the coil turn ratio collecting module, filters the current signal into a smooth signal through the signal filtering module, and outputs a stable current signal as the measured current input of the microcomputer protection device by combining the current automatic compensation module.
Preferably, the power supply mode switching module selects one of the pouring coil power supply processing module, the open coil power supply processing module and the core-through coil power supply processing module as the power supply mode.
Preferably, the power supply automatic compensation module comprises a chargeable and dischargeable super energy storage capacitor, a charging and discharging loop, a voltage output monitoring module, a voltage output protection module and a voltage compensation control module, the chargeable and dischargeable super energy storage capacitor outputs standby voltage when the output current of the single-winding coil is small, the charging and discharging loop carries out intelligent charging and discharging processing on the chargeable and dischargeable super energy storage capacitor, the voltage output monitoring module monitors the voltage of the power supply output interface, the voltage compensation is carried out on the chargeable and dischargeable super energy storage capacitor output voltage through the voltage compensation control module when the voltage is low, and the voltage output protection module carries out overvoltage voltage stabilization protection on the output voltage of the power supply output interface.
Preferably, the current automatic compensation module is used for compensating the current loss compensation of the single winding coil when supplying power, the current automatic compensation module comprises a coil input front end current monitoring module, a coil output rear end current monitoring module, a closed loop feedback module and a current compensation control module, the coil input front end current monitoring module and the coil output rear end current monitoring module are used for monitoring the change of current, and the closed loop feedback module and the current compensation control module output compensation current guarantee stable and accurate current output.
Preferably, the power supply system further comprises an electrical isolation module, a rectification module, a direct current filtering module, a voltage dividing and stabilizing module and a power supply mode switching controller, wherein the electrical isolation module is used for isolating the input end and the output end, the rectification module is used for converting alternating current voltage into direct current voltage, the direct current filtering module is used for reducing output direct current voltage ripples, the voltage dividing and stabilizing module divides the direct current voltage into four parts, namely power supply voltage of the power supply mode switching controller, power supply voltage of the voltage compensation controller, power supply voltage of the current compensation controller and microcomputer protection power supply voltage output through the power supply output interface, and the power supply mode switching controller is used for controlling the power supply mode switching module to switch the power supply modes.
Preferably, the current measuring device further comprises a dynamic adjustable current source and a current measuring output interface, the multi-type single-winding coil measuring module is synthesized and processed by the coil turn ratio acquisition module and the dynamic adjustable current source and then is input to the current measuring output interface, and the output current of the current measuring output interface is used as the measuring current input of the microcomputer protection device.
Preferably, the power supply further comprises a voltage compensation controller, and the voltage compensation controller logically judges whether the output voltage of the power supply output interface needs dynamic compensation by acquiring the voltage value of the voltage output monitoring module.
Preferably, still include the current compensation controller, coil input front end current monitoring module gathers coil input front end current signal, coil output rear end current monitoring module gathers coil output rear end current signal, front end current signal and rear end current signal all upload to the current compensation controller, the dynamic difference of front and rear end electric current is calculated through closed-loop feedback module to the current compensation controller.
The invention provides a power supply and measurement integrated device for a plurality of types of single-winding coils specially used for microcomputer protection, which receives the signal output of the single-winding coil, simultaneously provides power supply input and measurement input for a microcomputer protection device after internal signal processing, and provides secondary measurement current input for the microcomputer protection device while ensuring the normal power supply of the microcomputer protection device. The coil can reduce the output winding of the coil, save the material for manufacturing the coil and greatly improve the use efficiency of the coil while saving power supply equipment such as UPS, direct current screens or storage batteries. When power supply equipment is omitted, the output winding of the coil is reduced, energy consumption is reduced, and the effects of energy conservation and environmental protection are achieved.
Drawings
FIG. 1 is an internal configuration diagram of a single-winding coil power supply measurement integrated device according to the present invention;
FIG. 2 is a schematic diagram of an implementation of the multi-type single-winding coil power supply module of the present invention;
FIG. 3 is a schematic diagram of an implementation of the multi-type single-winding coil measurement module of the present invention;
FIG. 4 is a schematic diagram of an implementation of the power supply auto-compensation module of the present invention;
fig. 5 is a schematic diagram of an implementation of the current automatic compensation module of the present invention.
In the figure: 1. a coil signal input interface; 2. a multi-type single-winding coil power supply module; 3. a multi-type single-winding coil measuring module; 4. a power supply automatic compensation module; 5. a current automatic compensation module; 6. a pouring type coil power supply processing module; 7. the open type coil power supply processing module; 8. the core-through coil power supply processing module; 9. a power supply mode switching module; 10. a power supply output interface; 11. a coil turn ratio acquisition module; 12. a signal filtering module; 13. a chargeable and dischargeable super energy storage capacitor; 14. a charge-discharge loop; 15. a voltage output monitoring module; 16. a voltage output protection module; 17. a voltage compensation control module; 18. the coil is input into a front-end current monitoring module; 19. a coil output rear end current monitoring module; 20. a closed loop feedback module; 21. a current compensation control module; 22. a single-winding coil; 23. an electrical isolation module; 24. a rectification module; 25. a direct current filtering module; 26. a voltage division and stabilization module; 27. a power supply mode switching controller; 28. a dynamically adjustable current source; 29. a current measurement output interface; 30. a voltage compensation controller; 31. a current compensation controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the integrated power supply and measurement device special for the microcomputer protection comprises a multi-type single-winding coil power supply module 2, a multi-type single-winding coil measurement module 3, a power supply automatic compensation module 4 and a current automatic compensation module 5;
the power supply mode switching module 9 in the multi-type single-winding coil power supply module 2 selects one power supply mode from multiple power supply modes according to the type of the single-winding coil 22 for power supply output, outputs a stable power supply for a microcomputer protection device through the power supply output interface 10, and the multi-type single-winding coil power supply module 2 is connected with the output signal of the single-winding coil 22 through the coil signal input interface 1;
the multi-type single-winding coil measuring module 3 collects the coil turn ratio when the single-winding signal is input through the coil turn ratio collecting module 11, filters the current signal into a smooth signal through the signal filtering module 12, and outputs a stable current signal as the measuring current input of the microcomputer protection device by combining with the current automatic compensation module 5.
The first embodiment is as follows:
the integrated power supply and measurement device special for the microcomputer protection comprises a multi-type single-winding coil power supply module 2, a multi-type single-winding coil measurement module 3, a power supply automatic compensation module 4 and a current automatic compensation module 5;
the power supply mode switching module 9 in the multi-type single-winding coil power supply module 2 selects one power supply mode from multiple power supply modes according to the type of the single-winding coil 22 for power supply output, outputs a stable power supply for a microcomputer protection device through the power supply output interface 10, and the multi-type single-winding coil power supply module 2 is connected with the output signal of the single-winding coil 22 through the coil signal input interface 1;
the multi-type single-winding coil measuring module 3 collects the coil turn ratio when the single-winding signal is input through the coil turn ratio collecting module 11, filters the current signal into a smooth signal through the signal filtering module 12, and outputs a stable current signal as the measuring current input of the microcomputer protection device by combining with the current automatic compensation module 5.
The power supply automatic compensation module 4 comprises a chargeable and dischargeable super energy storage capacitor 13, a charge and discharge loop 14, a voltage output monitoring module 15, a voltage output protection module 16 and a voltage compensation control module 17, the chargeable and dischargeable super energy storage capacitor 13 outputs standby voltage when the output current of the single-winding coil 22 is small, the charge and discharge loop 14 carries out intelligent charge and discharge processing on the chargeable and dischargeable super energy storage capacitor 13, the voltage output monitoring module 15 monitors the voltage of the power supply output interface 10, the voltage compensation control module 17 controls the output voltage of the chargeable and dischargeable super energy storage capacitor 13 to carry out voltage compensation when the voltage is low, and the voltage output protection module 16 carries out overvoltage voltage stabilization protection on the output voltage of the power supply output interface 10.
The current automatic compensation module 5 is used for compensating current loss compensation when the single winding coil 22 is used for supplying power, the current automatic compensation module 5 comprises a coil input front end current monitoring module 18, a coil output rear end current monitoring module 19, a closed loop feedback module 20 and a current compensation control module 21, the coil input front end current monitoring module 18 and the coil output rear end current monitoring module 19 are used for monitoring current change, and the closed loop feedback module 20 and the current compensation control module 21 output compensation current to ensure stable and accurate current output.
Example two
The distinguishing techniques compared to the first embodiment are as follows:
referring to fig. 2, the present embodiment further includes an electrical isolation module 23, a rectification module 24, a dc filtering module 25, a voltage dividing and stabilizing module 26, and a power supply mode switching controller 27.
The output of the single-winding coil 22 is connected with the coil signal input interface 1, and the coil power supply processing module corresponding to the single-winding coil 22 is selected through the power supply mode switching module 9, and is divided into three power supply processing module modes, namely a pouring type coil power supply processing module 6, an open type coil power supply processing module 7 and a core-through type coil power supply processing module 8.
Each module processing mode adopts different processing modes according to the characteristics of the single-winding coil 22, after the processing is finished, the input end and the output end are isolated through the electrical isolation module 23 to ensure electrical safety, the alternating voltage is converted into direct current voltage through the rectifier module 24, the output direct current voltage has small ripple waves through the direct current filter module 25, and the direct current voltage is divided into a plurality of parts through the voltage dividing and stabilizing module 26, wherein the parts comprise the power supply voltage of the power supply mode switching controller 27, the power supply voltage of the voltage compensation controller 30, the power supply voltage of the current compensation controller 31 and the microcomputer protection power supply voltage output through the power supply output interface 10; the power supply method switching controller 27 serves as a controller for controlling the power supply method switching module 9 to switch the power supply method.
EXAMPLE III
The distinguishing techniques compared with the second embodiment are as follows:
referring to fig. 3, the present embodiment further includes a dynamically adjustable current source 28 and a current measurement output interface 29.
The output of the single winding coil 22 is connected with the coil signal input interface 1, and is input to the current measurement output interface 29 after being synthesized and processed by the coil turns ratio acquisition module 11 and the dynamic adjustable current source 28, and the output current of the current measurement output interface 29 is used as the measurement current input of the microcomputer protection device.
Example four
The distinguishing techniques compared with the third embodiment are as follows:
referring to fig. 4, the present embodiment further includes a voltage compensation controller 30, and the voltage compensation controller 30 logically determines whether the output voltage of the power output interface 10 needs to be dynamically compensated by obtaining the voltage value of the voltage output monitoring module 15.
When the current of the coil signal input interface 1 is small and the value of the voltage output monitoring module 15 is lower than a fixed value, the voltage compensation controller 30 controls the chargeable and dischargeable super energy storage capacitor 13 to discharge through the charge and discharge loop 14, the discharged amount is compensated to the power supply output interface 10 through the voltage compensation control module 17, the voltage of the power supply output interface 10 is increased after being compensated, and when the voltage is equal to the fixed value, the voltage compensation controller 30 controls the chargeable and dischargeable super energy storage capacitor 13 to stop discharging through the charge and discharge loop 14; when the current of the coil signal input interface 1 is large and the value of the voltage output monitoring module 15 is higher than a fixed value, the voltage output protection module 16 performs voltage stabilization processing on the value of the voltage output monitoring module 15, and the voltage compensation controller 30 controls the chargeable and dischargeable super energy storage capacitor 13 to perform charging processing through the charging and discharging loop 14 so as to store electric energy.
EXAMPLE five
The distinguishing techniques compared with the fourth embodiment are as follows:
referring to fig. 5, the present embodiment further includes a current compensation controller 31.
When the coil signal input interface 1 receives the output signal of the single-winding coil 22, on the one hand, it is output as a power supply, resulting in a reduction of the signal as a current measurement. The coil input front-end current monitoring module 18 collects a coil input front-end current signal, the coil output rear-end current monitoring module 19 collects a coil output rear-end current signal, the front-end current signal and the rear-end current signal are uploaded to the current compensation controller 31, the current compensation controller 31 calculates a dynamic difference value of front-end and rear-end currents through the closed-loop feedback module 20, the current compensation control module 21 controls the dynamically adjustable current source 28 to output currents to the current measurement output interface 29, the effect of dynamic current compensation is achieved, the compensated current value compensates current loss of the single-winding coil 22 serving as a power supply part, the current value of the current measurement output interface 29 is accurate and reliable, and therefore the measurement and collection current precision of the microcomputer protection device is high.
In the invention, by receiving the signal output of the single winding coil 22, the power supply input and the measurement input are provided for the microcomputer protection device after the signal processing is carried out inside the microcomputer protection device, the normal power supply of the microcomputer protection device is ensured, meanwhile, the secondary measurement current input is provided for the microcomputer protection device, the reliable operation of the microcomputer protection is ensured, and thus, the intelligent monitoring of the power transmission and distribution line is realized; meanwhile, the device is suitable for various coils, and the matched coil only needs to provide single-winding output, so that the material for manufacturing the coil is saved, and the process and the flow for manufacturing the coil are reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a multi-type single winding coil power supply measurement integrated device of microcomputer protection which characterized in that: the device comprises a multi-type single-winding coil power supply module (2), a multi-type single-winding coil measuring module (3), a power supply automatic compensation module (4) and a current automatic compensation module (5);
a power supply mode switching module (9) in the multi-type single-winding coil power supply module (2) selects one power supply mode from multiple power supply modes according to the type of the single-winding coil (22) to supply power and output, and outputs a stable power supply through a power supply output interface (10) to be used by a microcomputer protection device, and the multi-type single-winding coil power supply module (2) is connected with an output signal of the single-winding coil (22) through a coil signal input interface (1);
the multi-type single-winding coil measuring module (3) collects the coil turn ratio when a single-winding signal is input through the coil turn ratio collecting module (11), filters the current signal into a smooth signal through the signal filtering module (12), and outputs a stable current signal as the measured current input of the microcomputer protection device by combining the current automatic compensation module (5).
2. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 1, characterized in that: and the power supply mode switching module (9) selects one of the pouring type coil power supply processing module (6), the open type coil power supply processing module (7) and the core-through type coil power supply processing module (8) as a power supply mode.
3. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 2, characterized in that: the power supply automatic compensation module (4) comprises a chargeable and dischargeable super energy storage capacitor (13), a charging and discharging loop (14), a voltage output monitoring module (15), a voltage output protection module (16) and a voltage compensation control module (17), the chargeable and dischargeable super energy storage capacitor (13) is used as a standby voltage output when the single-winding coil (22) outputs a small current, the charge-discharge loop (14) carries out intelligent charge-discharge treatment on the chargeable and dischargeable super energy storage capacitor (13), the voltage output monitoring module (15) monitors the voltage of the power supply output interface (10), when the voltage is lower, the voltage compensation control module (17) controls the output voltage of the chargeable and dischargeable super energy storage capacitor (13) to perform voltage compensation, the voltage output protection module (16) performs overvoltage and voltage stabilization protection on the output voltage of the power supply output interface (10).
4. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 3, characterized in that: current automatic compensation module (5) are used for compensating the current loss compensation when single winding coil (22) is as the power supply, current automatic compensation module (5) include coil input front end current monitoring module (18), coil output rear end current monitoring module (19), closed loop feedback module (20) and current compensation control module (21), coil input front end current monitoring module (18) and coil output rear end current monitoring module (19) are used for monitoring the change of electric current, closed loop feedback module (20) and current compensation control module (21) output compensation current guarantee the current output of stable accuracy.
5. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 4, wherein: also comprises an electric isolation module (23), a rectification module (24), a direct current filtering module (25), a voltage division and stabilization module (26) and a power supply mode switching controller (27), the electric isolation module (23) is used for isolating the input end and the output end, the rectification module (24) is used for converting alternating-current voltage into direct-current voltage, and then the direct-current voltage ripple is reduced through the direct-current filtering module (25), the voltage dividing and stabilizing module (26) divides the direct current voltage into four parts of a power supply voltage of a power supply mode switching controller (27), a power supply voltage of a voltage compensation controller (30), a power supply voltage of a current compensation controller (31) and a microcomputer protection power supply voltage output by a power supply output interface (10), the power supply mode switching controller (27) is used for controlling the power supply mode switching module (9) to switch the power supply mode.
6. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 5, wherein: the multi-type single-winding coil measuring device is characterized by further comprising a dynamic adjustable current source (28) and a current measuring output interface (29), the multi-type single-winding coil measuring module (3) is subjected to synthesis processing through a coil turn ratio acquisition module (11) and the dynamic adjustable current source (28) and then is input to the current measuring output interface (29), and output current of the current measuring output interface (29) is used as measuring current input of the microcomputer protection device.
7. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 6, wherein: the voltage compensation controller (30) is used for logically judging whether the output voltage of the power supply output interface (10) needs dynamic compensation or not by acquiring the voltage value of the voltage output monitoring module (15).
8. The integrated device for power supply and measurement of the multiple types of single-winding coils special for microcomputer protection according to claim 7, wherein: still include current compensation controller (31), coil input front end current monitoring module (18) gather coil input front end current signal, coil output rear end current monitoring module (19) gather coil output rear end current signal, front end current signal and rear end current signal all upload to current compensation controller (31), current compensation controller (31) calculate the dynamic difference of front and rear end current through closed loop feedback module (20).
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Effective date of registration: 20220609 Address after: No. 150, Jinger Road, Daguanyuan, Shizhong District, Jinan City, Shandong Province Patentee after: Shandong Electric Power Marketing Center Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: 250002 Wang Yue Road, Ji'nan City, Shandong Province, No. 2000 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee before: State Grid Electric Power Research Institute Wuhan Nari Co., Ltd |