CN103605074A - Method and device for positioning fault of gas insulation closed switch - Google Patents
Method and device for positioning fault of gas insulation closed switch Download PDFInfo
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- CN103605074A CN103605074A CN201310643113.9A CN201310643113A CN103605074A CN 103605074 A CN103605074 A CN 103605074A CN 201310643113 A CN201310643113 A CN 201310643113A CN 103605074 A CN103605074 A CN 103605074A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009413 insulation Methods 0.000 title abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000015556 catabolic process Effects 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000004807 localization Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 229910018503 SF6 Inorganic materials 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The embodiment of the invention provides a method and device for positioning a fault of a gas insulation closed switch. The gas insulation closed switch comprises a plurality of closed gas chambers, and the gas chambers which have a breakdown fault are used as fault gas chambers. The device comprises an analyzer and a plurality of detecting positioners which are arranged on outer shells of the gas chambers. The detection positioners are used for collecting ultrasonic wave signals of the outer shells of the gas chambers when the breakdown fault happens; a wireless network is used for sending the ultrasonic wave signals and gas chamber position information corresponding to the ultrasonic wave signals to the analyzer; the analyzer is sued for selecting the ultrasonic wave signals of the fault gas chambers from the ultrasonic wave signals of the outer shells of all the gas chambers, and the positions of the fault gas chambers are determined according to the gas chamber position information corresponding to the ultrasonic wave signals.
Description
Technical field
The present invention relates to transmission line of electricity technical field, particularly a kind of Fault Locating Method of gas-insulated enclosed switch and device.
Background technology
Gas-insulated enclosed switch (GAS INSULATED SWITCHGEAR is called for short GIS) is one of key equipment in system for ultra-high voltage transmission.At present, GIS is applied in the middle of system for ultra-high voltage transmission widely, and the safety and stability of system for ultra-high voltage transmission is played to very important effect.
From structure, GIS comprises some complete totally enclosed air chambers.In air chamber, can be packaged with respectively the assemblies such as isolating switch, disconnector, bus, grounding switch, mutual inductor, outlet casing tube or cable termination, and in air chamber, be filled with the sulfur hexafluoride (SF of certain pressure
6) gas is as insulating medium, between different air chambers, with disc insulator, intercept.Owing to having taked the measure of insulation and obturation in GIS between each assembly, so when a part of assembly punctures, can not involve near other assemblies, the effectively expansion of Accident prevention scope, also easy access more.
In the middle of the test of system for ultra-high voltage transmission actual motion or GIS, often GIS invests the bus of transmission system, and the scope relating to reaches more than hundred meters, so must, when there is breakdown fault, determine rapidly abort situation.The generation of breakdown fault must be accompanied by strong sound, and localization of fault is utilized this point just.
In the middle of prior art, exist a kind ofly by arrange the scheme of ultrasonic detection instrument on GIS shell, can realize more accurately the detection of abort situation.But the defect of this mode is to have more serious potential safety hazard, and earth potential is raised owing to puncturing, and is easy to injure near the staff's who observes GIS safety.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Fault Locating Method and device of gas-insulated enclosed switch, is detection and location device integrated wireless communication function, realizes when accurately carrying out localization of fault, guarantees safety.
For achieving the above object, the present invention has following technical scheme:
A Fault Locating Method for gas-insulated enclosed switch, described gas-insulated enclosed switch comprises some closed air chambers, using the air chamber that occurs breakdown fault as fault gas chamber; A plurality of detection and location devices are arranged on the shell of described air chamber; Described method is specially:
When there is breakdown fault, detection and location device gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer; So that analyzer, from the ultrasonic signal of each air chamber shell, filters out the ultrasonic signal of fault gas chamber, according to air chamber positional information corresponding to this ultrasonic signal, determine the position of fault gas chamber.
The ultrasonic signal of the air chamber shell at described collection place is specially:
Acquisition strategies is set; When there is breakdown fault, according to acquisition strategies, gather the ultrasonic signal of the air chamber shell at place.
The described acquisition strategies that arranges comprises amplitude thresholds is set, and describedly according to acquisition strategies, gathers ultrasonic signal and is specially:
Gather the ultrasonic signal that amplitude surpasses amplitude thresholds.
The described acquisition strategies that arranges comprises length of delay is set, and describedly according to acquisition strategies, gathers ultrasonic signal and is specially:
Ultrasonic signal on the air chamber shell at delay collection place; The time that postpones to gather reaches described length of delay.
Described method also comprises:
The shockproofness that shows the ultrasonic signal gathering.
Described from the ultrasonic signal of each air chamber shell, the ultrasonic signal that filters out fault gas chamber is specially:
Contrast the shockproofness of the ultrasonic signal of each air chamber shell; Using the ultrasonic signal of shockproofness maximum as the ultrasonic signal of fault gas chamber.
A fault locator for gas-insulated enclosed switch, described gas-insulated enclosed switch comprises some closed air chambers, using the air chamber that occurs breakdown fault as fault gas chamber; Described device comprises analyzer, and a plurality of detection and location device, and detection and location device is arranged on the shell of described air chamber; Be specially:
Detection and location device, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer;
Analyzer, for the ultrasonic signal from each air chamber shell, filters out the ultrasonic signal of fault gas chamber, determines the position of fault gas chamber according to air chamber positional information corresponding to this ultrasonic signal.
Described detection and location device comprises:
Controller, for arranging acquisition strategies;
Calibrate AE sensor, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place according to acquisition strategies;
Signal projector, for utilizing wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
The described acquisition strategies that arranges comprises amplitude thresholds and length of delay is set; Describedly according to acquisition strategies, gather ultrasonic signal and be specially:
Postpone to gather on the air chamber shell at place, amplitude surpasses the ultrasonic signal of amplitude thresholds; The time that postpones to gather reaches described length of delay.
Described detection and location device also comprises:
Intensity display module, for showing the shockproofness of the ultrasonic signal of collection.As seen through the above technical solutions, the beneficial effect that the present invention exists is: with detection and location device, gather ultrasonic signal and utilize wireless network to transmit, make between detection and location device and analyzer no longer because the relation of communication is subject to the restriction of distance, the analyzer that need to closely operate can be arranged on position far away, keep the distance of a safety with GIS, while having prevented from puncturing, earth potential is raised and near staff's safety injuring; By the setting of length of delay and amplitude thresholds, got rid of the interference in ultrasonic signal gatherer process, the accuracy that has improved localization of fault; Utilize intensity display module, can be not by analyzer and the more succinct Primary Location that realizes fault.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is method flow diagram described in the embodiment of the present invention;
Fig. 2 is apparatus structure schematic diagram described in the embodiment of the present invention;
Fig. 3 is method flow diagram described in another embodiment of the present invention;
Fig. 4 is air chamber amplitude lamp schematic diagram described in the embodiment of the present invention;
Fig. 5 is apparatus structure schematic diagram described in another embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fault locator of the present invention and method, in order to guarantee testing personnel's security, so the work of determination and analysis is placed in safe distance range and is carried out.For detection and location device integrated wireless communication function, so that it can be by the ultrasound signal transmission gathering to remote analyzer.
A specific embodiment that is Fault Locating Method of the present invention referring to Fig. 1, the structural representation that Fig. 2 is fault locator of the present invention, described in Fig. 2, device is arranged on GIS.Visible in Fig. 2, GIS comprises some closed air chambers, and 5 square frames that marked numeral 1～5 represent 5 air chambers, and the air chamber that wherein occurs breakdown fault is fault gas chamber.Described device comprises a plurality of detection and location devices, and detection and location device is arranged on the shell of described air chamber, and each detection and location device special use gathers the ultrasonic signal on the air chamber shell at its place.
Described in the present embodiment, method is specially:
In the some air chambers of GIS, there is breakdown fault, will produce a ferocious current impulse, cause violent vibrations.The ultrasonic signal producing on air chamber shell is produced by this vibrations.Shake and will spread towards surrounding conduction by shaking the ultrasonic signal producing, and decay gradually, so obvious, the vibrations that the air chamber of generation breakdown fault is experienced are the strongest, the ultrasonic signal intensity on fault gas chamber shell is maximum.
After breakdown fault occurs, near many air chamber shells fault, all produce ultrasonic signal, now, different detection and location devices gathers the ultrasonic signal of the air chamber shell at place; And fault gas chamber shell is because the position that distance punctures generation is nearest, so the ultrasonic signal that the detection and location device on its shell collects must be the strongest.
Between existing GIS air chamber, with disc insulator, intercept; Disc insulator can play obvious iris action to vibrations, so the vibrations on adjacent air chamber can be compared fault gas chamber, significantly weakens.The present embodiment utilizes this point to realize the location of fault gas chamber just.
On the shell that is arranged on an air chamber corresponding to detection and location device, for this air chamber, gather ultrasonic signal, so a ultrasonic signal and an air chamber have just existed clear and definite corresponding relation.In the present embodiment, detection and location device utilizes wireless network that ultrasonic signal and air chamber positional information corresponding to ultrasonic signal are sent to analyzer in the lump, so that the location that utilizes described air chamber positional information finally to complete fault gas chamber.
It is emphasized that in the present embodiment combination and wireless communication technology just, utilize wireless network transmissions ultrasonic signal, make between detection and location device and analyzer no longer because the relation of communication is subject to the restriction of distance.Although detection and location device must be arranged on air chamber shell, detection and location device does not need in-plant operation; Support based on radio communication, the analyzer that need to closely operate can be arranged on position far away, and the distance of a safety of GIS maintenance, thereby has guaranteed staff's safety.
Aforementioned known, the ultrasonic signal that fault gas chamber is corresponding should be intensity maximum.So analyzer only need contrast the intensity of each ultrasonic signal, can find the ultrasonic signal of intensity maximum, being confirmed as is the ultrasonic signal of fault gas chamber.And, when ultrasonic signal sends, sent in the lump the positional information of corresponding air chamber; By the ultrasonic signal of fault gas chamber, further learn the positional information of fault gas chamber, the position of definite fault gas chamber, has realized localization of fault.
And the fault locator shown in Fig. 2, just in order to realize the entity apparatus of this said method.Fig. 2 shown device specifically comprises:
Detection and location device, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
Analyzer, for the ultrasonic signal from each air chamber shell, filters out the ultrasonic signal of fault gas chamber, determines the position of fault gas chamber according to air chamber positional information corresponding to this ultrasonic signal.Described analyzer can be PC or the server that possesses ultrasound signal analyzing function and radio communication function.
Embodiment shown in Fig. 1～2 is the basic embodiment of apparatus and method of the present invention, the beneficial effect that above embodiment exists is: with detection and location device, gather ultrasonic signal and utilize wireless network to transmit, make between detection and location device and analyzer no longer because the relation of communication is subject to the restriction of distance, the analyzer that need to closely operate can be arranged on position far away, keep the distance of a safety with GIS, while having prevented from puncturing, earth potential is raised and near staff's safety injuring.
Shown in Figure 3, be another specific embodiment of Fault Locating Method of the present invention, method, on basis embodiment illustrated in fig. 1, has been carried out further optimization and expansion described in the present embodiment; Middle description embodiment illustrated in fig. 1 is equally applicable in the present embodiment, below repeated description no longer.In the present embodiment, said method comprising the steps of:
Step 301, acquisition strategies is set; When there is breakdown fault, according to acquisition strategies, gather the ultrasonic signal of the air chamber shell at place.
In the present embodiment, in order to improve the accuracy of fault detect and location, so for the capture setting of ultrasonic signal acquisition strategies, to realize the further control gathering for ultrasonic signal.The setting of acquisition strategies described in the present embodiment comprises following two kinds: amplitude thresholds and length of delay are set.
When having set in advance amplitude thresholds, describedly according to acquisition strategies, gather ultrasonic signal and be specially: gather the ultrasonic signal that amplitude surpasses amplitude thresholds.
The setting of amplitude thresholds is a kind of means that exclude the interference signal.Because on fault gas chamber shell, the intensity of ultrasonic signal is larger, and the vibration signal of intensity under certain amplitude can be thought undesired signal, irrelevant with the ultrasonic signal that needs in the present embodiment to gather, so arranging its eliminating by amplitude thresholds.
When having set in advance length of delay, describedly according to acquisition strategies, gather ultrasonic signal and be specially: postpone to gather the ultrasonic signal on the air chamber shell at place; The time that postpones to gather reaches described length of delay.
The collection of carrying out ultrasonic signal why postponing, reason is as follows:
Be accompanied by the generation of breakdown fault, can produce that abort situation circuit voltage around falls suddenly or earth potential is raised phenomenon, and then appearance and breakdown fault time synchronized electric impulse signal.Electric impulse signal can be detected equally steady arm and gather, and if electric impulse signal be mingled in the middle of ultrasonic signal, can have influence on the accuracy of ultrasound signal analyzing.
But, because having, electric impulse signal synchronizes with puncturing, and ultrasonic signal related generation after puncturing, so on the time, electric impulse signal is prior to ultrasonic signal.In the present embodiment, the mistiming according to the two arranges length of delay, thereby the collection of ultrasonic signal is carried out in the generation that makes detection and location device no longer be accompanied by breakdown fault at once; But after puncturing generation, time delay is carried out the collection of ultrasonic signal after reaching time of length of delay again, so can avoid the interference of electric impulse signal.
In the present embodiment, arranging of length of delay and amplitude thresholds is all in order to get rid of the interference of external environment, improves the degree of accuracy that ultrasonic signal gathers.Can select arbitrarily one in actual applications and arrange, also can adopt simultaneously.If adopted simultaneously, so describedly according to acquisition strategies, gather ultrasonic signal and be specially: postpone to gather on the air chamber shell at place, amplitude surpasses the ultrasonic signal of amplitude thresholds; The time that postpones to gather reaches described length of delay.
The shockproofness of the ultrasonic signal that step 302, demonstration gather.
By aforementioned known, failure judgement air chamber is by the intensity of contrast echo ripple signal.According to this principle, in the present embodiment, detection and location device can, before analyzer carries out multianalysis to ultrasonic signal, first carry out simulation demonstration and the contrast roughly of a simple, intuitive by ad hoc fashion to ultrasonic signal intensity.For example, detection and location device carries out simulated or digitizing by the intensity of the ultrasonic signal of self place air chamber, and coordinates intensity display module to show.
The intensity of ultrasonic signal simulated, can adopt amplitude lamp is intensity display module.Example 5 air chambers as shown in Figure 4, in the present embodiment for each air chamber corresponding 5 amplitude lamps are set, the amplitude lamp that black circle representative lights, the amplitude lamp that soft dot representative is extinguished, the quantity that amplitude lamp lights is more, illustrates that the ultrasonic signal intensity that this air chamber is corresponding is larger.Obviously, air chamber 2 lights whole five amplitude lamps, can roughly judge that its corresponding ultrasonic signal intensity is maximum, concludes that air chamber 2 is for fault gas chamber.Similar, by the intensity digitizing of ultrasonic signal, can be directly to utilize display screen for intensity display module, directly show the numerical value of intensity.
Detection and location device directly shows the shockproofness of ultrasonic signal, can be not by analyzer and the more succinct Primary Location location of realizing fault.
Step 303, utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
Step 304, analyzer, from the ultrasonic signal of each air chamber shell, filter out the ultrasonic signal of fault gas chamber, determine the position of fault gas chamber according to air chamber positional information corresponding to this ultrasonic signal.
Fault locator shown in Fig. 5, just in order to realize the entity apparatus of method shown in this Fig. 3.Fig. 5 shown device specifically comprises:
Detection and location device, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
Described detection and location device comprises:
Controller, for arranging acquisition strategies;
Calibrate AE sensor, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place according to acquisition strategies;
The described acquisition strategies that arranges comprises amplitude thresholds and length of delay is set; Describedly according to acquisition strategies, gather ultrasonic signal and be specially: postpone to gather on the air chamber shell at place, amplitude surpasses the ultrasonic signal of amplitude thresholds; The time that postpones to gather reaches described length of delay.
Signal projector, for utilizing wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
Intensity display module, for showing the shockproofness of the ultrasonic signal of collection.
Analyzer, for the ultrasonic signal from each air chamber shell, filters out the ultrasonic signal of fault gas chamber, determines the position of fault gas chamber according to air chamber positional information corresponding to this ultrasonic signal.
The beneficial effect that Fig. 3～5 illustrated embodiment exists is: by the setting of length of delay and amplitude thresholds, got rid of the interference in ultrasonic signal gatherer process, the accuracy that has improved localization of fault; Utilize intensity display module, can be not by analyzer and the more succinct Primary Location that realizes fault; The embodiment overall technical architecture of described apparatus and method is more complete, open more abundant.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a Fault Locating Method for gas-insulated enclosed switch, is characterized in that, described gas-insulated enclosed switch comprises some closed air chambers, using the air chamber that occurs breakdown fault as fault gas chamber; A plurality of detection and location devices are arranged on the shell of described air chamber; Described method is specially:
When there is breakdown fault, detection and location device gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer; So that analyzer, from the ultrasonic signal of each air chamber shell, filters out the ultrasonic signal of fault gas chamber, according to air chamber positional information corresponding to this ultrasonic signal, determine the position of fault gas chamber.
2. method according to claim 1, is characterized in that, the ultrasonic signal of the air chamber shell at described collection place is specially:
Acquisition strategies is set; When there is breakdown fault, according to acquisition strategies, gather the ultrasonic signal of the air chamber shell at place.
3. method according to claim 2, is characterized in that, the described acquisition strategies that arranges comprises amplitude thresholds is set, and describedly according to acquisition strategies, gathers ultrasonic signal and is specially:
Gather the ultrasonic signal that amplitude surpasses amplitude thresholds.
4. method according to claim 2, is characterized in that, the described acquisition strategies that arranges comprises length of delay is set, and describedly according to acquisition strategies, gathers ultrasonic signal and is specially:
Ultrasonic signal on the air chamber shell at delay collection place; The time that postpones to gather reaches described length of delay.
5. method according to claim 1, is characterized in that, described method also comprises:
The shockproofness that shows the ultrasonic signal gathering.
6. according to method described in claim 1～5 any one, it is characterized in that, described from the ultrasonic signal of each air chamber shell, the ultrasonic signal that filters out fault gas chamber is specially:
Contrast the shockproofness of the ultrasonic signal of each air chamber shell; Using the ultrasonic signal of shockproofness maximum as the ultrasonic signal of fault gas chamber.
7. a fault locator for gas-insulated enclosed switch, is characterized in that, described gas-insulated enclosed switch comprises some closed air chambers, using the air chamber that occurs breakdown fault as fault gas chamber; Described device comprises analyzer, and a plurality of detection and location device, and detection and location device is arranged on the shell of described air chamber; Be specially:
Detection and location device, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place; And utilize wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer;
Analyzer, for the ultrasonic signal from each air chamber shell, filters out the ultrasonic signal of fault gas chamber, determines the position of fault gas chamber according to air chamber positional information corresponding to this ultrasonic signal.
8. install according to claim 7, it is characterized in that, described detection and location device comprises:
Controller, for arranging acquisition strategies;
Calibrate AE sensor, for when there is breakdown fault, gathers the ultrasonic signal of the air chamber shell at place according to acquisition strategies;
Signal projector, for utilizing wireless network by described ultrasonic signal, and air chamber positional information corresponding to ultrasonic signal is sent to analyzer.
9. device according to claim 8, is characterized in that, the described acquisition strategies that arranges comprises amplitude thresholds and length of delay are set; Describedly according to acquisition strategies, gather ultrasonic signal and be specially:
Postpone to gather on the air chamber shell at place, amplitude surpasses the ultrasonic signal of amplitude thresholds; The time that postpones to gather reaches described length of delay.
10. described in claim 7～9 any one, install, it is characterized in that, described detection and location device also comprises:
Intensity display module, for showing the shockproofness of the ultrasonic signal of collection.
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Cited By (7)
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| CN104020403A (en) * | 2014-06-20 | 2014-09-03 | 国家电网公司 | Diagnostic system for composite apparatus fault positioning |
| CN104076256A (en) * | 2014-06-23 | 2014-10-01 | 国家电网公司 | Ultrasonic positioning device and method for GIS withstand voltage breakdown fault |
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| CN105548810A (en) * | 2015-12-21 | 2016-05-04 | 国家电网公司 | Fault air chamber positioning method and device of buses |
| CN106840381A (en) * | 2017-03-15 | 2017-06-13 | 中国科学院武汉岩土力学研究所 | A kind of method of testing of blasting vibration attenuation effect |
| CN108645507A (en) * | 2018-04-16 | 2018-10-12 | 中国南方电网有限责任公司超高压输电公司曲靖局 | A kind of high-adaptability GIL vibration online monitoring neural network devices |
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| CN104076256A (en) * | 2014-06-23 | 2014-10-01 | 国家电网公司 | Ultrasonic positioning device and method for GIS withstand voltage breakdown fault |
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| CN106840381A (en) * | 2017-03-15 | 2017-06-13 | 中国科学院武汉岩土力学研究所 | A kind of method of testing of blasting vibration attenuation effect |
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| CN110726070A (en) * | 2019-10-22 | 2020-01-24 | 中石油江苏液化天然气有限公司 | Unloading arm proximity switch fault alarm circuit and unloading arm |
| CN110726070B (en) * | 2019-10-22 | 2021-03-12 | 中石油江苏液化天然气有限公司 | Unloading arm proximity switch fault alarm circuit and unloading arm |
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