CN101303038A - Intelligent air discharge system for hydraulic system pump front low-pressure end - Google Patents
Intelligent air discharge system for hydraulic system pump front low-pressure end Download PDFInfo
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- CN101303038A CN101303038A CNA2008100625430A CN200810062543A CN101303038A CN 101303038 A CN101303038 A CN 101303038A CN A2008100625430 A CNA2008100625430 A CN A2008100625430A CN 200810062543 A CN200810062543 A CN 200810062543A CN 101303038 A CN101303038 A CN 101303038A
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- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 42
- 239000007789 gas Substances 0.000 description 14
- 230000002950 deficient Effects 0.000 description 9
- 238000004146 energy storage Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000010720 hydraulic oil Substances 0.000 description 6
- 238000013022 venting Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 201000004569 Blindness Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention discloses an intelligent exhaust system used for a low-pressure end in front of a pump in a hydraulic pressure system, which comprises the pump and an air vessel, wherein, a manual air outlet is arranged at the low-pressure end in front of the pump, and the air vessel is arranged at the postion higher than the pump and lower than a liquid storage tank. The air vessel is connected with the manual air outlet and provided with an air outlet while the air outlet is connected with an exhaust valve. The air vessel is internally provided with a high and low liquid level sensor, and the exhaust valve and the high and low liquid level sensor are connected with a control module while the control module is connected with a monitoring indication module and a failure indication module. The technical proposal of the invention utilizes the principle that air specific weight is smaller than liquid specific weight to intensively collect the air in a low-pressure loop in front of the pump into the air vessel and automatically exhaust according to the condition of air reserve, thus avoiding the blind and regular manual exhaust, greatly reducing the contact frequency of workers with high risk equipment and high risk environments and greatly reducing the rate of serious accident.
Description
Technical field
The invention belongs to the hydraulics field, particularly relate to a kind of intelligent vent systems that is used for the preceding low tension loop exhaust of pump.
Background technique
In hydraulic system, hydraulic medium in the low pressure liquid tank often contacts with air, when flowing in oil hydraulic circuit, often the air of trace is brought into hydraulic medium, especially easier when the oil hydraulic pump periodic duty air is brought in the hydraulic medium, this will make in the high tension loop of oil hydraulic pump and cause the gas-liquid mixed phase, easily make high tension loop pressure instability, cause the motion instability of power mechanism, in stable, the safe and reliable important system of needs, may cause serious accident.For example high-voltage electric power system, the high-risk environmental system of petrochemical industry etc.Be that a high position at oil hydraulic pump low pressure liquid feeding end is provided with a manual relief opening mostly in the prior art,, have problems such as Security and poor reliability by manually making regular check on and exhaust.Hydraulic mechanism with high-voltage electric power system is the problem that the example explanation exists below.
Circuit breaker in the electric power system generally adopts the hydraulic mechanism transmission, and some import primary cut-out especially uses comparatively generally at present in national electric power system, from whole use condition, belongs to high quality of products.But best product does not have perfection to say yet, from the use of recent years, find, 500KV 3AT and 220KV3AQ1 circuit breaker hydraulic mechanism are suppressed abnormal defective even generation, and the phenomenon of expression mainly is to suppress frequently or build to press unsuccessful causing to suppress overtime alarm, has accident potential.
In the process of 500KV 3AT and 220KV 3AQ1 circuit breaker actual motion; the situation that oil pump turns round or frequently makes pump continuously takes place through regular meeting; this moment, the oil pressure of switch hydraulic system can maintain a relatively low stress level; after closing the power supply of oil pump, the oil pressure value of hydraulic system can remain unchanged.The time that this situation takes place generally is to be many in the morning in the temperature difference big season, and perhaps equipment is in conjunction with maintenance, and motor power cuts off when resuming operation more than 24 hours again and takes place.Inspection and disposing condition comprehensive analysis through the scene: the basic reason that causes problem to produce is to have air to exist in the oil pump piston, also can recognize oil pump idle running from sound.It mainly is high-voltage switch gear after operation a period of time that air is arranged in the oil pump piston, and the leakage of hydraulic system trace causes having gathered certain gas in the inside of oil pump low-pressure section and part high pressure oil system (energy storage tube and high-voltage oil cylinder).Because the existence of gas, oil pump can not output to high-pressure section with hydraulic oil from low-pressure section effectively, and then the oil pump continuous running appears, but the situation that oil pressure can not raise, oil pump also can take place owing to the hydraulic oil self-lubricating function is weakened the electrical failure (contactor burns) or the mechanical failure problems such as (oil pump damages) that cause being correlated with by gas simultaneously.
The continuously running or frequently make pump and defective that oil pressure can not raise of primary cut-out generation oil pump, can bring very big threat to the normal operation of circuit breaker, the process that the lasting generation of defective is not handled or the maintainer does not have a power failure handles defective all may cause circuit breaker to stop labour, reliable operation and users that consequent direct result will influence electrical network have a power failure, and the power transformating and supplying facility reliability index of power grid enterprises is also brought very adverse effect.
The processing method of this class defective is that oil hydraulic circuit is carried out effective exhaust, just can make working well of oil pump after hydraulic oil refills oil pump piston.Processing mode has two kinds at present, the irregular inspection equipment of the first, and under situation about not having a power failure, regularly carry out once artificial exhaust to all hydraulic mechanism oil pumps every year, and step is: the electric power switch of closing oil pump loop; Exhaust screw on the oil pump is unclamped, and remain on the state that unclamps, when the oil of discharging does not have bubble, tighten Exhaust screw; Electric power switch closes.
This work is fairly simple, and workload is also little, and equipment does not need to have a power failure, and purpose is the portion gas that excludes in the oil hydraulic circuit, makes the time that defective occurs obtain prolonging.But there is following subject matter in this mode: bigger potential safety hazard is arranged when 1) working, if brush up against inner other components and parts of switching mechanism case in the work, will cause the switch malfunction, thereby may cause the consequence of large-area power-cuts; 2) artificial exhaust expends a large amount of maintenance strength, and can't thoroughly eliminate and suppress overtime defective, the time lengthening that this defective is taken place, and overtime defective is just suppressed in the just artificial exhaust of actual often generation after one month.
Second kind of processing mode is: equipment is stopped labour, hydraulic system is carried out exhaust, step is:
A) oil pump to circuit breaker carries out exhaust: close the motor power of oil pump loop, the oil pressure of hydraulic system is discharged to zero-pressure; Venting plug on the oil pump is unclamped, remain on the state that unclamps, when the oil of discharging does not have bubble, tighten venting plug; The electric power switch that closes allows oil pump dally about 5 minutes (release this moment bolt remains on depressurization phase); Repeatedly above step 2 to 3 time, exhaust, oil pump idle running, no gas discharge in the pump housing; Close the oil pump bleeder screw, the motor power that closes, the preliminary filling pressure of inspection nitrogen energy storage tube gas; After storage is pressed onto normal pressure, deciliter circuit breaker 2 to 3 times; Release is checked to have or not gas to exist in the oil pump once more.
B) hydraulic system release is to energy storage tube, oil hydraulic cylinder and the exhaust of hydraulic locking device (oil pump idle running), till the hydraulic oil that the relevant relief opening with other of cylinder body energy storage tube relief opening flows out does not have bubble.
C) energy storage time that after exhaust finishes, check the nitrogen preliminary filling pressure of nitrogen energy storage tube, begins from zero-pressure and the pressure after deciliter branch operation and energy storage time again.
This work is relatively complicated, but the gas in the oil hydraulic circuit can be drained substantially, but the retention time soon, records at most according to practical experience and can only keep for 1 year.Though the exhaust effect of this mode is better, need to have a power failure and handle, for power equipment, frequent power failure will cause social and network system and have a strong impact on, and technical requirements is higher in real work, complicated operation.Exhaust needs oil pipe to connect, and connects improper meeting and causes a small amount of hydraulic oil flow to go out the possibility of fuel tank, so need the hydraulic oil of a spot of same numeral of preparation, producer to replenish; The shutoff screw that is also noted that relief opening simultaneously is the red copper material, twists into two parts easily.
Summary of the invention
For effectively; thoroughly; solve easily in the hydraulic system owing to low voltage terminal before the pump produces the problem that gas causes equipment failure; guarantee the proper functioning of hydraulic system; the purpose of this invention is to provide a kind of intelligent venting gas appliance that is used for the preceding low voltage terminal of hydraulic system pump; be arranged on the position that is higher than pump and is lower than liquid tank; be connected with low voltage terminal before the pump; utilize the principle of gas than liquid light; gas is imported in the venting gas appliance; air in can the centralized collection low tension loop; and automatic vent according to circumstances; avoid the artificial regular manual exhaust of blindness; significantly reduce the staff and contact the frequency of exposure of high-risk equipment and high-risk environment; can greatly reduce the accident rate of major accident, both improve the job security of equipment; reliability has improved operator's labour productivity and production safety again.
To achieve the above object, the present invention has adopted following technological scheme:
A kind of intelligent vent systems that is used for the preceding low voltage terminal of hydraulic system pump, comprise pump, low voltage terminal is provided with manual relief opening before the pump, one is arranged on the air container that is higher than pump and is lower than the liquid tank position, air container is connected with described manual relief opening, described air container is provided with relief opening, relief opening is connected with outlet valve, be provided with the height liquid level sensor in the described air container, described outlet valve and height liquid level sensor link control module, described control module is connected with monitoring indicating module and failure indication module.
As preferably, above-mentioned height liquid level sensor comprises the mounting rod that vertically is located in the air container, the mounting rod sky puts buoy and following buoy, and mounting rod is provided with last buoy and following buoy is limited in mobile limit structure in two sections up and down of mounting rod respectively, wherein, described go up buoy and float downward to put on be equipped with magnetic part, described mounting rod is provided with upper sensor and the lower sensor that whether buoy and following buoy put in place on the sensing respectively, these two sensors connect described control module.Adopt the height liquid level sensor of this kind structure, can effectively differentiate the air quantity in the air container first; Second running state that can real-time monitoring system can effectively be distinguished sensor fault or other system fault, and timely alarm; Three simple in structure easy to make.
Above-mentioned control module is carried out according to following steps:
Step 3 is read in the outlet valve state; When control module instruction is opened outlet valve and is detected outlet valve when having opened, in the monitoring indicating module indication exhaust; When control module instruction is opened outlet valve and when detecting outlet valve and not opening, failure indication module indication exhaust failure; When control module instruction is closed outlet valve and is detected outlet valve when having closed, in the monitoring indicating module indication monitoring; When control module instruction is closed outlet valve and when detecting outlet valve and not closing, failure indication module indication exhaust failure;
The employing above-mentioned steps is carried out, and the system that can realize is according to the good automatic vent of the air in the air container, and has self-monitoring and deixis.
Above-mentioned monitoring indicating module and failure indication module are the acousto-optic indicating circuit.
Above-mentioned outlet valve is a solenoid valve, and described outlet valve is connected with forces manual air discharge cook.Being provided with and force forcing manual air discharge cook, is to consider that strong magnetic disturbance is more serious in the Environmental Conditions of this system, can partly break down at control circuit like this and can't open under the situation of outlet valve manually opened outlet valve exhaust.
State to above-mentioned outlet valve is monitored, and can be that control module is judged according to detected liquid level change of state situation, also can be that an exhaust monitoring sensor independently is set on above-mentioned outlet valve, and the exhaust monitoring sensor connects described control module.
Above-mentioned air container is connected with pump by flexible pipe.
Above-mentioned air container sidewall is provided with the liquid level viewing window.
The present invention is owing to adopted above technological scheme, utilize air specific weight to compare liquid light, can be with the air centralized collection in the low tension loop before the pump to air container, outlet valve is opened when liquid level sensor perception liquid level is lower than setting height, utilize liquid road height pressure reduction automatic vent, liquid level raises automatically; After the exhaust, exhaust valve closure when liquid level sensor perception liquid level reaches setting height.This device can be according to gas storage situation automatic vent; avoided the manual exhaust of artificial regular blindness; significantly reduce the staff and contacted the frequency of exposure of high-risk equipment and high-risk environment; can greatly reduce the accident rate of major accident; both improve job security, the reliability of equipment, improved operator's labour productivity and production safety again.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the program flow diagram of control module.
Fig. 3 is an electrical principle block diagram of the present invention.
Fig. 4 is the structural representation of height liquid level sensor.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is made a detailed explanation.
Embodiment 1:
A kind of intelligent vent systems that is used for the preceding low voltage terminal of hydraulic system pump as shown in Figure 1, comprise pump 1, low voltage terminal is provided with manual relief opening 2 before the pump 1, comprise that also is arranged on an air container 5 that is higher than pump 1 and is lower than the liquid tank position, air container 5 is connected with described manual relief opening 2, described air container 5 is provided with relief opening 6, relief opening 6 is connected with outlet valve 7, be provided with height liquid level sensor 8 in the described air container 5, as shown in Figure 3, above-mentioned outlet valve 7 and height liquid level sensor 8 link control modules 9, above-mentioned control module 9 is connected with monitoring indicating module and failure indication module.
Present embodiment is example with native system using in high-voltage electric power system, as shown in Figure 4, described height liquid level sensor 8 comprises the mounting rod 81 that vertically is located in the air container 5, mounting rod 81 sky put buoy 82 and following buoy 83, and mounting rod 81 is provided with last buoy 82 and following buoy 83 is limited in mobile limit structure in two sections up and down of mounting rod 81 respectively, wherein, described going up on buoy 82 and the following buoy 83 is equipped with magnetic part, described mounting rod 81 is provided with upper sensor and the lower sensor that whether buoy 82 and following buoy 83 put in place on the sensing respectively, and these two sensors connect described control module 9.As shown in Figure 4, come-up is marked in the A1-A2 and moves, and floats downward to be marked in the B1-B2 and moves, and wherein, A1, B1 are respectively buoy and the target upper limit of floating downward, and A2, B2 are respectively buoy and float downward the target lower limit.
Above-mentioned monitoring indicating module and failure indication module be the acousto-optic indicating circuit for being made of LED and sounding device all.Above-mentioned outlet valve 7 is a solenoid valve, can direct controlled module 9 controls open and close, and also can be that controlled module 9 realizes opening and closing by certain exhaust control circuit or mechanism, and above-mentioned outlet valve 7 be connected with the manual air discharge cook of pressure.Above-mentioned outlet valve 7 is provided with the exhaust monitoring sensor, and the exhaust monitoring sensor connects described control module 9.Above-mentioned air container 5 is connected with pump 1 by flexible pipe 3, to avoid the influence of vibration of pump.Above-mentioned air container 5 sidewalls are provided with liquid level viewing window 4.
As shown in Figure 2, above-mentioned control module 9 is carried out according to following steps:
Step 3 is read in outlet valve 7 states; When control module 9 instruction is opened outlet valves 7 and is detected outlet valve 7 when having opened, in the monitoring indicating module indication exhaust; When control module 9 instruction is opened outlet valves 7 and when detecting outlet valve 7 and not opening, failure indication module indication exhaust failure; When control module 9 instruction is closed outlet valve 7 and is detected outlet valve 7 when having closed, in the monitoring indicating module indication monitoring; When control module 9 instruction is closed outlet valve 7 and when detecting outlet valve 7 and not closing, failure indication module indication exhaust failure;
Claims (8)
1. intelligent vent systems that is used for low voltage terminal before the hydraulic system pump, comprise pump (1), the preceding low voltage terminal of pump (1) is provided with manual relief opening (2), it is characterized in that, comprise that also is arranged on an air container (5) that is higher than pump (1) and is lower than the liquid tank position, air container (5) is connected with described manual relief opening (2), described air container (5) is provided with relief opening (6), relief opening (6) is connected with outlet valve (7), be provided with height liquid level sensor (8) in the described air container (5), described outlet valve (7) and height liquid level sensor (8) link control module (9), described control module (9) is connected with monitoring indicating module and failure indication module.
2. a kind of intelligent vent systems that is used for the preceding low voltage terminal of hydraulic system pump according to claim 1, it is characterized in that, described height liquid level sensor (8) comprises the mounting rod (81) that vertically is located in the air container (5), mounting rod (81) sky puts buoy (82) and following buoy (83), and mounting rod (81) is provided with last buoy (82) and following buoy (83) is limited in the limit structures that move in two sections up and down of mounting rod (81) respectively, wherein, described going up on buoy (82) and the following buoy (83) is equipped with magnetic part, described mounting rod (81) is provided with upper sensor and the lower sensor that whether buoy (82) and following buoy (83) put in place on the sensing respectively, and these two sensors connect described control module (9).
3. a kind of intelligent vent systems that is used for the preceding low voltage terminal of hydraulic system pump according to claim 2 is characterized in that described control module (9) is carried out according to following steps:
Step 1, system initialization;
Step 2 is read in the state of buoy (82) and following buoy (83); When detecting buoy (82) and following buoy (83) and all arrived upper limit, control module (9) is closed outlet valve (7); When detecting buoy (82) and following buoy (83) and all arrived lower limit, control module (9) is opened outlet valve (7); When detecting that buoy (82) has arrived lower limit and buoy (83) is when arriving upper limit down, control module (9) is opened outlet valve (7); When detecting that buoy (82) has arrived upper limit and buoy (83) is when arriving lower limit down, control module (9) is closed outlet valve (7), and failure indication module indication sensor fault;
Step 3 is read in outlet valve (7) state; Open outlet valve (7) and detect outlet valve (7) when opening when control module (9) instruction, the monitoring indicating module is indicated in the exhaust; Open outlet valve (7) and detect outlet valve (7) when not opening when control module (9) instruction, failure indication module is indicated exhaust failure; In control module (9) instruction is closed outlet valve (7) and is detected outlet valve (7) when closing, and the indication of monitoring indicating module is monitored; Close outlet valve (7) and detect outlet valve (7) when not closing when control module (9) instruction, failure indication module is indicated exhaust failure;
Step 4 is returned step 2 and is continued to carry out.
4. according to claim 1 or 2 or 3 described a kind of intelligent vent systems that are used for low voltage terminal before the hydraulic system pump, it is characterized in that described monitoring indicating module and failure indication module are the acousto-optic indicating circuit.
5. according to claim 1 or 2 or 3 described a kind of intelligent vent systems that are used for low voltage terminal before the hydraulic system pump, it is characterized in that described outlet valve (7) is a solenoid valve, described outlet valve (7) is connected with forces manual air discharge cook.
6. according to claim 1 or 2 or 3 described a kind of intelligent vent systems that are used for low voltage terminal before the hydraulic system pump, it is characterized in that described outlet valve (7) is provided with the exhaust monitoring sensor, the exhaust monitoring sensor connects described control module (9).
7. according to claim 1 or 2 or 3 described a kind of intelligent vent systems that are used for low voltage terminal before the hydraulic system pump, it is characterized in that described air container (5) is connected with pump (1) by flexible pipe (3).
8. according to claim 1 or 2 or 3 described a kind of intelligent vent systems that are used for low voltage terminal before the hydraulic system pump, it is characterized in that described air container (5) sidewall is provided with liquid level viewing window (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100625430A CN101303038B (en) | 2008-06-23 | 2008-06-23 | Intelligent air discharge system for hydraulic system pump front low-pressure end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100625430A CN101303038B (en) | 2008-06-23 | 2008-06-23 | Intelligent air discharge system for hydraulic system pump front low-pressure end |
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| Publication Number | Publication Date |
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| CN101303038A true CN101303038A (en) | 2008-11-12 |
| CN101303038B CN101303038B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100625430A Active CN101303038B (en) | 2008-06-23 | 2008-06-23 | Intelligent air discharge system for hydraulic system pump front low-pressure end |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103112672A (en) * | 2013-02-01 | 2013-05-22 | 东莞市永强汽车制造有限公司 | Air-liquid supply control system and air-liquid supply control method of tank-truck flexible wave-resistant device |
| CN103889532A (en) * | 2011-10-17 | 2014-06-25 | 伊顿公司 | Hydraulic air bleed valve system |
| CN109911833A (en) * | 2018-11-12 | 2019-06-21 | 中航通飞研究院有限公司 | A kind of passive brake system method for exhausting of aircraft |
| CN112747012A (en) * | 2020-12-30 | 2021-05-04 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Automatic exhaust valve device and exhaust method |
-
2008
- 2008-06-23 CN CN2008100625430A patent/CN101303038B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889532A (en) * | 2011-10-17 | 2014-06-25 | 伊顿公司 | Hydraulic air bleed valve system |
| CN103889532B (en) * | 2011-10-17 | 2016-03-02 | 伊顿公司 | Hydraulic pressure vent valve system |
| CN103112672A (en) * | 2013-02-01 | 2013-05-22 | 东莞市永强汽车制造有限公司 | Air-liquid supply control system and air-liquid supply control method of tank-truck flexible wave-resistant device |
| CN109911833A (en) * | 2018-11-12 | 2019-06-21 | 中航通飞研究院有限公司 | A kind of passive brake system method for exhausting of aircraft |
| CN109911833B (en) * | 2018-11-12 | 2022-12-13 | 中航通飞研究院有限公司 | Exhaust method of passive brake system of airplane |
| CN112747012A (en) * | 2020-12-30 | 2021-05-04 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Automatic exhaust valve device and exhaust method |
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| Publication number | Publication date |
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| CN101303038B (en) | 2012-07-04 |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20130128 |
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Effective date of registration: 20130128 Address after: 310009 No. 219, Jianguo Middle Road, Hangzhou, Zhejiang Patentee after: Hangzhou Electric Power Bureau Patentee after: State Grid Corporation of China Address before: 310009 No. 219, Jianguo Middle Road, Hangzhou, Zhejiang Patentee before: Hangzhou Electric Power Bureau |