CN104502788B - Vehicle mounted type intelligent ground detecting system and ground detecting method - Google Patents
Vehicle mounted type intelligent ground detecting system and ground detecting method Download PDFInfo
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- CN104502788B CN104502788B CN201510011998.XA CN201510011998A CN104502788B CN 104502788 B CN104502788 B CN 104502788B CN 201510011998 A CN201510011998 A CN 201510011998A CN 104502788 B CN104502788 B CN 104502788B
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Abstract
The invention discloses a kind of vehicle mounted type intelligent ground detecting system, it comprises signal acquisition module, analog signal processing module, analog-to-digital conversion module and digital signal processor, this system can to the intelligent distinguishing whether effective grounding when carrying out energizing test of electric power Special test car, automatically can protect as unearthed, the test of energising combined floodgate cannot be carried out; Invention increases electric power Special test car experimental safe, effectively protect the safety of testing crew and testing equipment.
Description
Technical field
The present invention relates to power system device technical field, refer to a kind of vehicle mounted type intelligent ground detecting system and ground detecting method particularly.
Background technology
The site test electric power Special test cars such as electric-power metering car, high-pressure test vehicle, especially need the special-purpose vehicle carrying out more than 10kV high-voltage test, when testing at the scene, and necessary safe and effective ground connection, the safety of guarantee site test personnel.Due to personnel's carelessness, may cause occurring unearthed or that ground state is good not situation during test.If when now carrying out pressure build-up test there is electric leakage in charging equipment, the situation such as flashover, electric discharge appears in high-tension apparatus, may cause instrument and meter voltage raise and device housings charged, cause instrument and meter to damage, under serious conditions, may the security incidents such as casualties be occurred.
At present, can the Test Field test equipment of electric power Special test car whether safety ground, seriously jeopardize the safety of equipment and personnel on instruction carriage.
Summary of the invention
Object of the present invention will provide a kind of vehicle mounted type intelligent ground detecting system and ground detecting method exactly, and this system and method can whether effective grounding detects to car load, and provides protection automatically and ground connection prompting.
For realizing this object, vehicle mounted type intelligent ground detecting system designed by the present invention, it is characterized in that: it comprises signal acquisition module, analog signal processing module, analog-to-digital conversion module and digital signal processor, wherein, described signal acquisition module comprises voltage transformer (VT) T1, resistance R1 ~ resistance R4 and resistance RX, described analog signal processing module comprises the first signal transacting submodule, secondary signal process submodule and the 3rd signal transacting submodule, described first signal transacting submodule comprises resistance R5, resistance R6 and analog computing amplifier IC1, secondary signal process submodule comprises resistance R9, resistance R10 and analog computing amplifier IC2, 3rd signal transacting submodule comprises resistance R7, resistance R8 and analog computing amplifier IC3,
The A phase of one end connection electric power Special test car power supply that described voltage transformer (VT) T1 is elementary, the B phase of the other end connection electric power Special test car power supply that voltage transformer (VT) T1 is elementary, one end of resistance R3 connects the elementary one end of voltage transformer (VT) T1, one end of resistance R1 connects the elementary other end of voltage transformer (VT) T1, one end of the other end contact resistance R2 of resistance R1, one end of the other end contact resistance RX of resistance R2, one end of the other end contact resistance R4 of resistance R3, one end of the other end contact resistance RX of resistance R4, the other end ground connection GND of resistance RX, one end of one end contact resistance R5 of voltage transformer (VT) T1 level, one end of the other end contact resistance RX of voltage transformer (VT) T1 level,
The inverting input of the other end connecting analog operational amplifier IC1 of described resistance R5, the in-phase input end ground connection GND of analog computing amplifier IC1, the output terminal of analog computing amplifier IC1 connects the first input port of analog-to-digital conversion module, contact resistance R6 between the inverting input of analog computing amplifier IC1 and the output terminal of analog computing amplifier IC1;
The other end of one end contact resistance R1 of described resistance R9, the inverting input of the other end connecting analog operational amplifier IC2 of resistance R9, the in-phase input end ground connection GND of analog computing amplifier IC2, the output terminal of analog computing amplifier IC2 connects the second input port of analog-to-digital conversion module, contact resistance R10 between the inverting input of analog computing amplifier IC2 and the output terminal of analog computing amplifier IC2;
The other end of one end contact resistance R3 of described resistance R7, the inverting input of the other end connecting analog operational amplifier IC3 of resistance R7, the in-phase input end ground connection GND of analog computing amplifier IC3, the output terminal of analog computing amplifier IC3 connects the 3rd input port of analog-to-digital conversion module, contact resistance R8 between the inverting input of analog computing amplifier IC3 and the output terminal of analog computing amplifier IC3;
The signal input part of the first delivery outlet of described analog-to-digital conversion module, the second delivery outlet and the 3rd delivery outlet incoming digital signal processor, the signal output part of described digital signal processor connects the controller of electric power Special test car.
A ground detecting method for above-mentioned vehicle mounted type intelligent ground detecting system, it is characterized in that, it comprises the steps:
Step 1: the magnitude of voltage U recording resistance RX in signal acquisition module in advance
x;
Step 2: described signal acquisition module gathers the voltage U between the power supply A phase of electric power Special test car with B phase
abratio small-signal U
ab1, the power supply A of electric power Special test car connects the voltage U in place
aratio small-signal U
a1, the power supply B of electric power Special test car connects the voltage U in place
bratio small-signal U
b1;
Step 3: described analog signal processing module is to aforementioned proportion small-signal U
ab1, ratio small-signal U
a1with ratio small-signal U
b1carry out high-barrier from amplification, filtering clutter, correspondence obtains filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2;
Step 4: described analog-to-digital conversion module is to above-mentioned filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2carry out analog to digital conversion and obtain digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3;
Step 5: described digital signal processor is according to above-mentioned digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3, and with reference to above-mentioned magnification ratio relation at different levels, obtain the magnitude of voltage U between the power supply A phase of electric power Special test car with B phase
ab, electric power Special test car power supply A to connect the magnitude of voltage U in place
ato connect the magnitude of voltage U in place with the power supply B of electric power Special test car
b, digital signal processor calculates power ground and compares B
x=U
ab/ U
a+ U
b;
Step 6: calculate critical ground connection and compare B in digital signal processor
x0=U
ab/ U
x, wherein, U
abfor the magnitude of voltage between power supply A phase and B phase of electric power Special test car, U
xfor the magnitude of voltage of resistance RX obtained in step 1, the power ground calculated in step 5 is compared B
xb is compared with critical ground connection
x0compare, when power ground compares B
xbe greater than critical ground connection and compare B
x0time, provide unearthed display and control signal, wherein, display is to display, and control signal gives the controller of described electric power Special test car, when power ground compares B
xbe less than or equal to critical ground connection and compare B
x0time, provide display and the control signal of ground connection, wherein, display is to display, and control signal gives the controller of described electric power Special test car.
The said system of the present invention's design and method can judge the whether safety ground of electric power Special test car quickly and accurately, and provide protection automatically and ground connection prompting.Add the safety and reliability of electric power Special test car, if when avoiding pressure build-up test there is electric leakage in charging equipment, the situation such as flashover, electric discharge appears in high-tension apparatus, the instrument and meter voltage that may cause raise and device housings charged, ensure that the safety of instrument and meter and personnel.
Accompanying drawing explanation
Fig. 1 is using state structured flowchart of the present invention;
Fig. 2 is circuit structure diagram of the present invention;
Wherein, controller, the 6-display of 1-signal acquisition module, 2-analog signal processing module, 3-analog-to-digital conversion module, 4-digital signal processor, 5-electric power Special test car.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Vehicle mounted type intelligent ground detecting system as illustrated in figs. 1 and 2, it comprises signal acquisition module 1, analog signal processing module 2, analog-to-digital conversion module 3 and digital signal processor 4, wherein, described signal acquisition module 1 comprises voltage transformer (VT) T1, resistance R1 ~ resistance R4 and resistance RX, described analog signal processing module 2 comprises the first signal transacting submodule, secondary signal process submodule and the 3rd signal transacting submodule, described first signal transacting submodule comprises resistance R5, resistance R6 and analog computing amplifier IC1, secondary signal process submodule comprises resistance R9, resistance R10 and analog computing amplifier IC2, 3rd signal transacting submodule comprises resistance R7, resistance R8 and analog computing amplifier IC3,
The A phase of one end connection electric power Special test car power supply (AC380V power supply) that described voltage transformer (VT) T1 is elementary, the B phase of the other end connection electric power Special test car power supply that voltage transformer (VT) T1 is elementary, one end of resistance R3 connects the elementary one end of voltage transformer (VT) T1, one end of resistance R1 connects the elementary other end of voltage transformer (VT) T1, one end of the other end contact resistance R2 of resistance R1, one end of the other end contact resistance RX of resistance R2, one end of the other end contact resistance R4 of resistance R3, one end of the other end contact resistance RX of resistance R4, the other end ground connection GND of resistance RX, one end of one end contact resistance R5 of voltage transformer (VT) T1 level, one end of the other end contact resistance RX of voltage transformer (VT) T1 level,
The inverting input of the other end connecting analog operational amplifier IC1 of described resistance R5, the in-phase input end ground connection GND of analog computing amplifier IC1, the output terminal of analog computing amplifier IC1 connects the first input port of analog-to-digital conversion module 3, contact resistance R6 between the inverting input of analog computing amplifier IC1 and the output terminal of analog computing amplifier IC1;
The other end of one end contact resistance R1 of described resistance R9, the inverting input of the other end connecting analog operational amplifier IC2 of resistance R9, the in-phase input end ground connection GND of analog computing amplifier IC2, the output terminal of analog computing amplifier IC2 connects the second input port of analog-to-digital conversion module 3, contact resistance R10 between the inverting input of analog computing amplifier IC2 and the output terminal of analog computing amplifier IC2;
The other end of one end contact resistance R3 of described resistance R7, the inverting input of the other end connecting analog operational amplifier IC3 of resistance R7, the in-phase input end ground connection GND of analog computing amplifier IC3, the output terminal of analog computing amplifier IC3 connects the 3rd input port of analog-to-digital conversion module 3, contact resistance R8 between the inverting input of analog computing amplifier IC3 and the output terminal of analog computing amplifier IC3;
The signal input part of the first delivery outlet of described analog-to-digital conversion module 3, the second delivery outlet and the 3rd delivery outlet incoming digital signal processor 4, the signal output part of described digital signal processor 4 connects the controller 5 of electric power Special test car.
In technique scheme, described digital signal processor 4 display output terminal is also connected with display 6.
In technique scheme, the elementary voltage of described voltage transformer (VT) T1 is 450V, and secondary voltage is 3V.
In technique scheme, the resistance of described resistance R1 and resistance R3 is equal is 100K Europe, the resistance of described resistance R2 and resistance R4 is equal is 1K Europe, the resistance of described resistance R5, resistance R9 and resistance R7 is equal is 22K Europe, and the resistance of described resistance R6, resistance R10 and resistance R8 is equal is 20K Europe.
In technique scheme, the present invention adopts power resistor and accurate voltage mutual inductor to carry out voltage sample.Meanwhile, sampled signal uses high resistant isolated amplifier to carry out signal isolation sampling and filtering harmonic wave.
A ground detecting method for above-mentioned vehicle mounted type intelligent ground detecting system, it is characterized in that, it comprises the steps:
Step 1: the magnitude of voltage U recording resistance RX in signal acquisition module 1 in advance
x;
Step 2: described signal acquisition module 1 gathers the voltage U between the power supply A phase of electric power Special test car with B phase
abratio small-signal U
ab1(U
ab=150U
ab1), the power supply A of electric power Special test car connects the voltage U in place
aratio small-signal U
a1(U
a=101U
a1), the power supply B of electric power Special test car connects the voltage U in place
bratio small-signal U
b1(U
b=101U
b1);
Step 3: described analog signal processing module 2 couples of aforementioned proportion small-signal U
ab1, ratio small-signal U
a1with ratio small-signal U
b1carry out high-barrier from amplification, filtering clutter, correspondence obtains filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2(the high resistant amplifying circuit such as employing of the present invention is isolated, and avoids because power consumption during sampling causes sampling error, and to U
ab1, U
a1, U
b1carry out filtering process, obtain U
ab2, U
a2, U
b2, the enlargement factor of amplifying circuit is 1, i.e. U
ab1=U
ab2, U
a1=U
a2, U
b1=U
b2);
Step 4: described analog-to-digital conversion module 3 is to above-mentioned filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2carry out analog to digital conversion and obtain digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3(to simulating signal U
ab2, U
a2, U
b2carry out analog to digital conversion and gather 64 data respectively according to the frequency of 3.2kHz, carrying out raw data conversion to 64 data collected respectively, the root-mean-square value calculating 64 data obtains digital voltage signal U
ab3, U
a3, U
b3);
Step 5: described digital signal processor 4 is according to above-mentioned digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3, and with reference to above-mentioned magnification ratio relation at different levels, obtain the magnitude of voltage U between the power supply A phase of electric power Special test car with B phase
ab, electric power Special test car power supply A to connect the magnitude of voltage U in place
ato connect the magnitude of voltage U in place with the power supply B of electric power Special test car
b, digital signal processor 4 calculates power ground and compares B
x=U
ab/ U
a+ U
b;
Step 6: calculate critical ground connection and compare B in digital signal processor 4
x0=U
ab/ U
x, wherein, U
abfor the magnitude of voltage between power supply A phase and B phase of electric power Special test car, U
xfor the magnitude of voltage of resistance RX obtained in step 1, the power ground calculated in step 5 is compared B
xb is compared with critical ground connection
x0compare, when power ground compares B
xbe greater than critical ground connection and compare B
x0time, provide unearthed display and control signal, wherein, display is to display 6, and control signal gives the controller 5 of described electric power Special test car, when power ground compares B
xbe less than or equal to critical ground connection and compare B
x0time, provide display and the control signal of ground connection, wherein, display is to display 6, and control signal gives the controller 5 of described electric power Special test car, can point out the whether safety ground of electric power Special test car after above-mentioned display access display 6.
In above-mentioned steps 6, the control signal that digital signal processor 4 sends control signal corresponding to ground connection to the controller 5 of electric power Special test car or do not have ground connection corresponding, when the controller 5 of electric power Special test car receives control signal corresponding to ground connection, the controller 5 of electric power Special test car controls electric power Special test car and can carry out closing operation, when the controller 5 of electric power Special test car receive cannot control signal corresponding to ground connection time, the controller 5 of electric power Special test car controls electric power Special test car and can not carry out closing operation.The design achieves automatic protection when electric power Special test car does not have a safety ground, ensure that the safety of pertinent instruments and personnel.
Invention increases the experimental safe of electric power Special test car, stop because carelessness forgets that the dangerous situation that ground connection causes occurs.
The present invention's difference and the place of other ground detecting systems are that native system is utilize power supply phase voltage at different stake resistance condition phasing degree different, differentiate whether ground connection, native system only needs connection ground wire to judge whether ground connection, with needs two ground wires, judge whether that the principle of ground connection has essential distinction according to the resistance between two ground wires.
The content that this instructions is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. a vehicle mounted type intelligent ground detecting system, it is characterized in that: it comprises signal acquisition module (1), analog signal processing module (2), analog-to-digital conversion module (3) and digital signal processor (4), wherein, described signal acquisition module (1) comprises voltage transformer (VT) T1, resistance R1 ~ resistance R4 and resistance RX, described analog signal processing module (2) comprises the first signal transacting submodule, secondary signal process submodule and the 3rd signal transacting submodule, described first signal transacting submodule comprises resistance R5, resistance R6 and analog computing amplifier IC1, secondary signal process submodule comprises resistance R9, resistance R10 and analog computing amplifier IC2, 3rd signal transacting submodule comprises resistance R7, resistance R8 and analog computing amplifier IC3,
The A phase of one end connection electric power Special test car power supply that described voltage transformer (VT) T1 is elementary, the B phase of the other end connection electric power Special test car power supply that voltage transformer (VT) T1 is elementary, one end of resistance R3 connects the elementary one end of voltage transformer (VT) T1, one end of resistance R1 connects the elementary other end of voltage transformer (VT) T1, one end of the other end contact resistance R2 of resistance R1, one end of the other end contact resistance RX of resistance R2, one end of the other end contact resistance R4 of resistance R3, one end of the other end contact resistance RX of resistance R4, the other end ground connection GND of resistance RX, one end of one end contact resistance R5 of voltage transformer (VT) T1 level, one end of the other end contact resistance RX of voltage transformer (VT) T1 level,
The inverting input of the other end connecting analog operational amplifier IC1 of described resistance R5, the in-phase input end ground connection GND of analog computing amplifier IC1, the output terminal of analog computing amplifier IC1 connects the first input port of analog-to-digital conversion module (3), contact resistance R6 between the inverting input of analog computing amplifier IC1 and the output terminal of analog computing amplifier IC1;
The other end of one end contact resistance R1 of described resistance R9, the inverting input of the other end connecting analog operational amplifier IC2 of resistance R9, the in-phase input end ground connection GND of analog computing amplifier IC2, the output terminal of analog computing amplifier IC2 connects the second input port of analog-to-digital conversion module (3), contact resistance R10 between the inverting input of analog computing amplifier IC2 and the output terminal of analog computing amplifier IC2;
The other end of one end contact resistance R3 of described resistance R7, the inverting input of the other end connecting analog operational amplifier IC3 of resistance R7, the in-phase input end ground connection GND of analog computing amplifier IC3, the output terminal of analog computing amplifier IC3 connects the 3rd input port of analog-to-digital conversion module (3), contact resistance R8 between the inverting input of analog computing amplifier IC3 and the output terminal of analog computing amplifier IC3;
The signal input part of the first delivery outlet of described analog-to-digital conversion module (3), the second delivery outlet and the 3rd delivery outlet incoming digital signal processor (4), the signal output part of described digital signal processor (4) connects the controller (5) of electric power Special test car.
2. vehicle mounted type intelligent ground detecting system according to claim 1, is characterized in that: described digital signal processor (4) display output terminal is also connected with display (6).
3. vehicle mounted type intelligent ground detecting system according to claim 1, is characterized in that: the elementary voltage of described voltage transformer (VT) T1 is 450V, and secondary voltage is 3V.
4. vehicle mounted type intelligent ground detecting system according to claim 1, it is characterized in that: the resistance of described resistance R1 and resistance R3 is equal is 100K Europe, the resistance of described resistance R2 and resistance R4 is equal is 1K Europe, the resistance of described resistance R5, resistance R9 and resistance R7 is equal is 22K Europe, and the resistance of described resistance R6, resistance R10 and resistance R8 is equal is 20K Europe.
5. utilize a ground detecting method for vehicle mounted type intelligent ground detecting system described in claim 1 to 4 any one, it is characterized in that, it comprises the steps:
Step 1: the magnitude of voltage U recording resistance RX in signal acquisition module (1) in advance
x;
Step 2: described signal acquisition module (1) gathers the voltage U between the power supply A phase of electric power Special test car with B phase
abratio small-signal U
ab1, the power supply A of electric power Special test car connects the voltage U in place
aratio small-signal U
a1, the power supply B of electric power Special test car connects the voltage U in place
bratio small-signal U
b1;
Step 3: described analog signal processing module (2) is to aforementioned proportion small-signal U
ab1, ratio small-signal U
a1with ratio small-signal U
b1carry out high-barrier from amplification, filtering clutter, correspondence obtains filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2;
Step 4: described analog-to-digital conversion module (3) is to above-mentioned filtered voltage signal U
ab2, filtered voltage signal U
a2with filtered voltage signal U
b2carry out analog to digital conversion and obtain digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3;
Step 5: described digital signal processor (4) is according to above-mentioned digital voltage signal U
ab3, digital voltage signal U
a3with digital voltage signal U
b3, and with reference to above-mentioned magnification ratio relation at different levels, obtain the magnitude of voltage U between the power supply A phase of electric power Special test car with B phase
ab, electric power Special test car power supply A to connect the magnitude of voltage U in place
ato connect the magnitude of voltage U in place with the power supply B of electric power Special test car
b, digital signal processor (4) calculates power ground and compares B
x=U
ab/ U
a+ U
b;
Step 6: calculate critical ground connection and compare B in digital signal processor (4)
x0=U
ab/ U
x, wherein, U
abfor the magnitude of voltage between power supply A phase and B phase of electric power Special test car, U
xfor the magnitude of voltage of resistance RX obtained in step 1, the power ground calculated in step 5 is compared B
xb is compared with critical ground connection
x0compare, when power ground compares B
xbe greater than critical ground connection and compare B
x0time, provide unearthed display and control signal, wherein, display is to display (6), and control signal gives the controller (5) of described electric power Special test car, when power ground compares B
xbe less than or equal to critical ground connection and compare B
x0time, provide display and the control signal of ground connection, wherein, display is to display (6), and control signal gives the controller (5) of described electric power Special test car.
6. ground detecting method according to claim 5, it is characterized in that: in described step 6, the control signal that digital signal processor (4) sends control signal corresponding to ground connection to the controller (5) of electric power Special test car or do not have ground connection corresponding, when the controller (5) of electric power Special test car receives control signal corresponding to ground connection, the controller (5) of electric power Special test car controls electric power Special test car and can carry out closing operation, when the controller (5) of electric power Special test car receive cannot control signal corresponding to ground connection time, the controller (5) of electric power Special test car controls electric power Special test car and can not carry out closing operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510011998.XA CN104502788B (en) | 2015-01-09 | 2015-01-09 | Vehicle mounted type intelligent ground detecting system and ground detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510011998.XA CN104502788B (en) | 2015-01-09 | 2015-01-09 | Vehicle mounted type intelligent ground detecting system and ground detecting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104502788A CN104502788A (en) | 2015-04-08 |
| CN104502788B true CN104502788B (en) | 2015-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1100997C (en) * | 2000-09-15 | 2003-02-05 | 清华大学 | Method and equipment for positioning failure point on electric power transmission line |
| JP3678151B2 (en) * | 2001-01-11 | 2005-08-03 | 日産自動車株式会社 | Electric vehicle ground fault detection device |
| CN1250978C (en) * | 2004-09-24 | 2006-04-12 | 北京交通大学 | Passive earth detecting method and device for main circuit of ac-dc electric locomotive |
| CN202372598U (en) * | 2011-11-30 | 2012-08-08 | 国网电力科学研究院武汉南瑞有限责任公司 | Vehicle-mounted device grounding detection circuit |
| CN204347179U (en) * | 2015-01-09 | 2015-05-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Vehicle mounted type intelligent ground detecting system |
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Effective date of registration: 20160805 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: State Grid Electric Power Research Insititute Patentee after: Electric Power Research Institute of State Grid Anhui Electric Power Company Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee before: State Grid Electric Power Research Insititute |
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Effective date of registration: 20170124 Address after: 100000 Beijing West Chang'an Avenue No. 86 Patentee after: State Grid Corporation of China Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: Electric Power Research Institute of State Grid Anhui Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee before: State Grid Electric Power Research Insititute Patentee before: Electric Power Research Institute of State Grid Anhui Electric Power Company |