CN204029699U - A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer - Google Patents
A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer Download PDFInfo
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- CN204029699U CN204029699U CN201420196031.4U CN201420196031U CN204029699U CN 204029699 U CN204029699 U CN 204029699U CN 201420196031 U CN201420196031 U CN 201420196031U CN 204029699 U CN204029699 U CN 204029699U
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Abstract
A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer, relate to the vacuum switchgear with vacuum degree on-line real time monitoring function, comprise A, B, C three-phase vacuum interrupter, in vacuum interrupter, insert and have or not line vacuum transducer, the outdoor vacuum-degree monitoring that sets of vacuum extinction, prior-warning device, described wireless vacuum transducer and vacuum-degree monitoring, prior-warning device adopts wireless signal to connect, its monitoring method is, wireless vacuum transducer is directly monitored the vacuum degree of vacuum extinction chamber interior, by wireless way for transmitting, arrive vacuum-degree monitoring, prior-warning device, show in real time vacuum degree and send vacuum interrupter gas leakage early warning and leakage alarm, realize operation vacuum degree on-line monitoring and the early warning of electric power vacuum switch.Solved the vacuum degree on-line monitoring of electric power vacuum switch, and a difficult problem for the High-Voltage Insulation of monitoring means and monitored thing, greatly reduce the deteriorated accident causing of electric power vacuum degree of vacuum switch, improved the reliability of equipment.
Description
Technical field
The utility model relates to a kind of electric power system high voltage switchgear and without line vacuum monitoring technology, especially relate to a kind of electric power vacuum switch with vacuum degree on-line real time monitoring function, provide simultaneously and use this electric power vacuum switch to carry out the method for vacuum degree on-line monitoring.
Background technology
Power high voltage switch is most important high voltage electric equipment in electrical network, its kind mainly comprises SF6 switch, vacuum switch and oil switch three classes, wherein vacuum switch has good electric current and cut-offs characteristic, cost is low simultaneously, volume is little, become the main flow high-voltage switch gear of 12KV, 40.5KV electric pressure, there is very high occupation rate of market, be widely used in the power equipments such as electric power vacuum switch cabinet, electric power vacuum circuit-breaker, pvs (pole-mounted vacuum switch), load vacuum switch.Along with the raising of vacuum switch reliability, be applied to the voltage levels such as 110KV, 220KV and also have broad prospects.
Along with the development of intelligent grid technology, to vacuum switch to cut-off reliability requirement more and more higher, the running status on-line monitoring of vacuum switch to ensureing power grid security, to realize repair based on condition of component significant.Developed at present the Condition Monitoring Technology of multiple vacuum switch, the on-line monitoring, the partial discharge monitoring that comprise stroke-time, spring tension, electrical contact endurance, on/off switch coil current, energy storage motor state, temperature rise etc., to improving the reliability of vacuum switch, brought into play important function, but the most critical factor that determines Vacuum Circuit Breaker performance is its vacuum extinction chamber interior " vacuum degree ", when the low vacuum of vacuum interrupter is in 10
-1during Pa, vacuum switch will be lost current breaking capacity, and electric power netting safe running is formed to great security threat.At present, due to technical restriction, there is technical difficulty in the on-line monitoring, the early warning that realize vacuum degree of vacuum switch, or cost is high, need high pressure to isolate.Can only rely on the vacuum degree of factory testing, periodic maintenance to detect, this can not meet growing raising vacuum switch reliability and the requirement of Current Maintenance of Equipments.Therefore, the vacuum degree on-line monitoring of vacuum switch is to improving vacuum switch reliability, ensureing that power grid security has critical effect.
In the life cycle of vacuum switch, the vacuum degree of vacuum interrupter maintain the vacuum seal performance that relies on himself completely, realize completely air tight and keep high vacuum in long-time running, there is technically very high requirement and technology difficulty.Although the vacuum seal performance of vacuum interrupter is high more a lot of than the sealing property of SF6 switch, but vacuum switch reliability is considered to conventionally not as good as SF6 switch, this is mainly that SF6 gas density can on-line monitoring, and the vacuum degree of vacuum switch is difficult to on-line monitoring, tonifying Qi in time when SF6 gas occurs slowly to reveal, so industry thinks that SF6 circuit breaker has higher reliability.Just because of the worry to vacuum switch reliability, the application of vacuum switch only concentrates in 12KV, 40.5KV and presses grade at present, the good vacuum switch of vacuum degree, in higher electric pressure, as 110KV, 220KV, has good break performance too in fact.Because vacuum switch cost is low, volume is little and the significant advantage such as environmental friendliness, if be applied to the voltage levels such as 110KV, 220KV, T & D Technology is produced to significant impact, also will produce good economic benefit, eliminate the discharge of greenhouse gas SF6 simultaneously, produce great environmental benefit.Can vacuum switch be generalized to the power transmission and transformation system of voltage levels, and its key is to improve the reliability of vacuum switch.
Although manufacture vacuum material, the vacuum seal technology of vacuum interrupter, reached quite ripe degree, the leak rate of vacuum interrupter constantly declines, but it is very difficult realizing all vacuum interrupters completely air tight, and especially the measuring technology of utmost point less leakage rate is very difficult.Even if can develop the measuring technology of measuring utmost point less leakage rate in the future, cost is also incited somebody to action very high and is difficult to bear.Progress along with vacuum technique, vacuum interrupter can be realized good vacuum seal during fabrication, reached very high rate of finished products, but vacuum interrupter in long-term running because service conditions is severe, cause vacuum-packed deteriorated or lost efficacy and to be difficult to avoid completely, although rate of failure is very low, the deteriorated of vacuum degree still forms significant threat to the operational reliability of vacuum switch, and especially the power transmission and transformation system in voltage levels is difficult to accept.The vacuum degree of vacuum switch is deteriorated is a very process for slow decreasing; the variation of on-line monitoring vacuum degree of vacuum switch; the vacuum degree fault of timely early warning vacuum switch; can avoid the accident of cut-offfing of vacuum switch; guarantee short circuit, the load current connecting-disconnecting function of vacuum switch; safe operation that can effective guarantee electrical network, will solve the integrity problem of vacuum switch.When the low vacuum of vacuum interrupter for example, in the threshold value of setting (1.33 * 10
-2pa) time, change in time vacuum interrupter, can avoid serious vacuum switch accident.But 10
-3pa-10
-1the detection of Pa vacuum degree needs special-purpose vacuum gauge or instrument, not only cost is high, volume is large, and the sealing property that is difficult to accomplish charged on-line monitoring and does not affect vacuum interrupter, make economy, effective vacuum degree of vacuum switch on-line monitoring become a large technical barrier of bulk of worldwide electricity industry.Therefore, the vacuum degree on-line monitoring technique of vacuum switch is the technology that power industry is being researched and developed always, has great economic worth and social value.
At present, use vacuum switch to carry out vacuum-degree monitoring method, mainly comprise laboratory detection, Site Detection and detect online three kinds of methods.
1) vacuum degree laboratory is detected: this is current main detection method, it utilizes special-purpose vacuum inspective meter that vacuum level of vacuum arc-quenching chamber is carried out factory testing, regularly detected, such vacuum degree detects and vacuum interrupter need to be separated from vacuum switch, in laboratory, adopt special-purpose vacuum inspective meter to detect, cannot realize vacuum switch and detect online.
2) vacuum degree Site Detection: after vacuum circuit-breaker is out of service, not separated vacuum interrupter, adopts the method monitoring vacuum degree of vacuum switch such as industrial frequency withstand voltage, high-frequency discharge, high-frequency current, magnetic charging.These methods belong to the off-line monitoring of the vacuum degree of carrying out when overhaul of the equipments, can not realize the vacuum degree on-line monitoring under vacuum switch running status, be difficult to really to prevent vacuum switch vacuum degree in service deteriorated cause cannot cut-off accident, also cannot realize " repair based on condition of component " of vacuum circuit-breaker.
3) vacuum degree detects online: be current technology trends, can realize the vacuum degree Real-Time Monitoring of vacuum switch under running status, thus the accident of cut-offfing that really can prevent vacuum switch, also " repair based on condition of component " for vacuum switch provides guidance.Online " indirect monitoring " and " directly monitoring " the two kinds of modes that mainly contain that detect of vacuum degree.
1. " indirect monitoring " mode: while moving based on vacuum switch, vacuum level of vacuum arc-quenching chamber is deteriorated to be caused:
A) electric field change that metallic shield charge accumulation produces;
Discharge pulse current amplitude when b) vacuum switch moves between conducting rod and metallic shield and frequency change;
C) the discharging sound transmitting producing during Vacuum Circuit Breaker, the variation of electric arc arc light color.
The common feature of these " indirect monitoring " methods is can only be 10
-1realize the roughly monitoring to vacuum degree in Pa-1Pa vacuum ranges, cannot realize to vacuum switch the most key 10
-3pa-10
-1the condition of high vacuum degree monitoring of Pa, and the external interference of electrical network is serious, poor stability, the current aspect that only rests on academic research, is not applied to electric power system.
2. " directly monitor " mode:
A) adopt at vacuum interrupter and access the variation of gauge measurement vacuum degree outward, but 10
-3pa-10
-1the high vacuum of Pa cannot be measured by Pressure gauge, and Pressure gauge needs high pressure to isolate and signal is isolated, and does not obtain practical application;
B) on vacuum interrupter, pre-install vacuum transducer, as cold cathode Penning discharge vacuum measurement rule, vacuum gauge is inner to communicate with vacuum interrupter, it is converted to the signal of telecommunication by Penning discharge principle by vacuum-pressure signal and exports, need equally high pressure isolation and signal isolation, this technology is researched and developed success and is applied by ChengDu XuShun Electronic Co., Ltd, but its Penning discharge vacuum gauge, the isolation of ion column high pressure, photosignal isolation cause its production cost high, technical sophistication, have high pressure isolation hidden danger, its range of application is subject to great restriction.
The common feature of these existing " directly monitoring " methods is to adopt wired connection, need to solve the signal isolation of high pressure isolation, sensor sensing device and the testing circuit of transducer and electrical network, cost is high, technical sophistication, especially in the system of high pressure and ultrahigh-voltage voltage grade, cost will increase considerably, and have huge high pressure isolation hidden danger.The high pressure that urgent need solves on-line monitoring transducer from technology, cost is isolated and signal isolating problem.
Vacuum degree of vacuum switch on-line monitoring is challenging technically, and its technological difficulties are 10
-3pa-10
-1the high-true monitoring of Pa is had relatively high expectations technically, needs special-purpose vacuum gauge, and its cost is high, volume is large, and the high-tension electricity of vacuum gauge isolation simultaneously, signal photoelectricity isolating problem solve difficult problems such as also having cost is high, high pressure isolation hidden danger.
Summary of the invention
The utility model for current vacuum degree of vacuum switch on-line monitoring technology difficulty and not enough, proposed a kind ofly can adopt the manufacture of micro-electromechanical technology mass, with low cost, volume microminaturization, and adopt wireless sensor technology, fundamentally solve high-tension electricity isolation and the signal isolating problem of vacuum transducer in vacuum switch on-line monitoring, and produced vacuum degree on-line monitoring electric power vacuum switch and the monitoring method thereof based on wireless vacuum transducer of good economic benefit and social benefit.
The utility model is for realizing above-mentioned technical purpose, provide following technical scheme: a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer, comprise A, B, C three-phase vacuum interrupter, it is characterized in that inserting and having or not line vacuum transducer in vacuum interrupter, outdoor vacuum-degree monitoring, the prior-warning device of setting of vacuum extinction, described wireless vacuum transducer adopts wireless signal to be connected with vacuum-degree monitoring, prior-warning device.
Described wireless vacuum transducer consists of vacuum degree sensor and wireless coupler, vacuum degree sensor is electrically connected to by lead-in wire with wireless coupler, and described vacuum degree sensor is positioned at the inside of vacuum interrupter or the outside of vacuum interrupter and is communicated with vacuum interrupter inner chamber.
The method that wireless vacuum transducer is inserted vacuum interrupter has two kinds, and embedded inserting with outside inserted.
Wireless vacuum transducer is embedded, and to insert vacuum interrupter be that the vacuum degree sensor of wireless vacuum transducer is installed on vacuum extinction chamber interior, and wireless coupler is positioned at inside or the vacuum extinction outdoor of vacuum interrupter.Further preferably vacuum degree sensor is fixed on the porcelain shell inner surface of vacuum interrupter, and wireless coupler can be positioned on the porcelain shell inner surface of vacuum interrupter or the outside of vacuum interrupter equally.Adopt the wireless vacuum transducer of embedded implantation mode, wireless vacuum transducer is miniature transducer, be embedded in vacuum extinction indoor, vacuum interrupter adopts the manufacture of one-step seal-exhaust technique, and the embedded method of inserting vacuum interrupter of wireless vacuum transducer is to insert when one-step seal-exhaust technique.Wireless vacuum transducer selects requirement can stand high temperature (800-900 degree) manufacture process of vacuum interrupter, does not need like this to change the existing manufacturing process of vacuum interrupter, reduces production costs.
It is to design a vacuum cavity in vacuum extinction outdoor that vacuum interrupter is inserted in wireless vacuum transducer outside, described vacuum cavity is tightly connected by vacuum tube and vacuum interrupter, the vacuum degree sensor of wireless vacuum transducer is installed on vacuum cavity inside, and wireless coupler is positioned at the inside of vacuum cavity or the outside of vacuum cavity.Adopt the wireless vacuum transducer of outside implantation mode, its method of inserting vacuum interrupter is that wireless vacuum transducer is inserted after vacuum interrupter manufacture completes, and vacuum interrupter adopts exhaust station technique to carry out vacuum seal.The wireless vacuum transducer of inserting, without high temperature (800-900 degree) manufacture process that stands vacuum interrupter, has expanded the optional scope of wireless vacuum transducer, to transducer, requires lower.
Described vacuum-degree monitoring, prior-warning device comprise wireless antenna, signal processing circuit, input/output interface circuit, display circuit, warning and early warning circuit, and described signal processing circuit and wireless antenna, input/output interface circuit, display circuit, warning and early warning circuit be signal communication respectively.
Use the monitoring method of this vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer to be: wireless vacuum transducer is directly measured the vacuum degree of vacuum extinction chamber interior, by wireless signal mode, be transferred to vacuum-degree monitoring, prior-warning device, show in real time vacuum degree and send vacuum interrupter gas leakage early warning and leakage alarm, realizing operation vacuum degree on-line monitoring and the early warning of electric power vacuum switch.
Described transmission of wireless signals mode preferably adopts the wireless and passive mode of electromagnetic resonance coupling, radio frequency signal inquiry, or the wireless transmission mode based on wireless energy supply.If adopt the wireless and passive mode of electromagnetic resonance coupling, wireless transmission distance is centimetre to tens of centimetres of magnitudes, do not have electrical lead to pass the porcelain shell of vacuum interrupter, do not affect the existing manufacturing process of vacuum interrupter, reduce costs, guaranteed the workmanship of vacuum interrupter.If adopt radio frequency signal inquiry mode, transmission of wireless signals is distant, tens of centimetres to tens of meters magnitudes, can realize better high pressure isolation, and installation difficulty is installed, reduced to monitoring equipment flexibly.If adopt the wireless transmission mode based on wireless energy supply, transmission of wireless signals distance is farther, several meters to tens of meters magnitudes.
As preferably, vacuum-degree monitoring, prior-warning device are accepted the information of vacuum transducer by wireless signal mode, and compare with the early warning, the alarm threshold value that arrange, according to result, carry out multistage early warning, warning.
The beneficial effects of the utility model: 1, vacuum switch of the present utility model can adopt electromagnetic resonance coupling, radio frequency signal inquiry or realize the transmission of vacuum transducer signal based on the wireless modes such as wireless transmission of wireless energy supply, directly, the indoor vacuum degree of Real-Time Monitoring vacuum extinction, can avoid the vacuum pressure within the scope of external interference, accurate perception 0.0001-1Pa, the fault that can avoid in time vacuum circuit-breaker can not normally cut-off circuit, the reliability of raising equipment.
2, without under powering-off state, realize measuring online, in real time and early warning of the indoor vacuum degree of vacuum extinction, significantly improved the equipment dependability of electric power vacuum switch, promoted product technology content and competitiveness, there is good application and popularization value.
3, adopt the indoor vacuum degree of wireless vacuum transducer monitoring vacuum extinction, fundamentally solved High-Voltage Insulation, the high pressure isolating problem of vacuum transducer, significantly reduce the cost of High-Voltage Insulation and isolation.
4, adopt the indoor vacuum degree of wireless vacuum transducer monitoring vacuum extinction, can realize the vacuum degree on-line monitoring of each electric pressure electric power vacuum switch from mesolow to superhigh pressure, solved the integrity problem that the vacuum leak of electric power vacuum switch causes, to expand the occupation rate of market of electric power vacuum switch at the power switch of 110KV, 220KV electric pressure, thereby reduce SF
6the use amount of power switch, reduces power switch cost, reduces greenhouse gas (SF
6) discharge.
Accompanying drawing explanation
Fig. 1 is A, the B of electric power vacuum switch in the utility model, the schematic diagram of C three-phase vacuum interrupter.
Fig. 2 is that in the utility model, wireless vacuum transducer forms schematic diagram.
Fig. 3 is vacuum-degree monitoring in the utility model, prior-warning device schematic diagram.
Fig. 4 is 1 one kinds of embedded schematic diagrames of inserting wireless vacuum transducer of the utility model embodiment.
Fig. 5 is the another kind of embedded schematic diagram of inserting wireless vacuum transducer of the utility model embodiment 2.
Fig. 6 is the schematic diagram that wireless vacuum transducer is inserted in the utility model embodiment 3 outsides.
Fig. 7 is that the schematic diagram that passes device without line vacuum is inserted in the another kind of outside of the utility model embodiment 4.
Embodiment
Embodiment 1: a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer, comprise A, B, C three-phase vacuum interrupter 2, in vacuum interrupter 2, insert and have or not line vacuum transducer 1, vacuum interrupter 2 is outer sets vacuum-degree monitoring, prior-warning device 3, and described wireless vacuum transducer 1 is connected with vacuum-degree monitoring, prior-warning device 3 wireless signals.
Wireless vacuum transducer 1 consists of vacuum degree sensor 4 and wireless coupler 5, vacuum degree sensor 4 is electrically connected to by lead-in wire 6 with wireless coupler 5, wireless vacuum transducer 1 adopts embedded mode to insert vacuum interrupter 2, its vacuum degree sensor 4 is fixed on the porcelain shell inner surface of vacuum interrupter 2, and wireless coupler 5 is also positioned on the porcelain shell inner surface of vacuum interrupter 2.
Vacuum-degree monitoring, prior-warning device 3 comprise wireless antenna 9, signal processing circuit 10, input/output interface circuit 11, display circuit 12, warning and early warning circuit 13, described signal processing circuit 10 and wireless antenna 9, input/output interface circuit 11, display circuit 12, warning and early warning circuit 13 difference signal communication.
By the embedded method of inserting vacuum interrupter of wireless vacuum transducer, be to insert when the one-step seal-exhaust technique.
Embodiment 2, and with reference to embodiment 1, wireless coupler 5 is positioned at the outside of vacuum interrupter 6.
Embodiment 3, with reference to embodiment 1, wireless vacuum transducer 1 is inserted vacuum interrupter 2 with external mode, at vacuum interrupter 2 outside design one vacuum cavities 7, described vacuum cavity 7 is tightly connected by vacuum tube 8 and vacuum interrupter 2, and the vacuum degree sensor 4 of wireless vacuum transducer 1 and wireless coupler 5 are all installed on the inside of vacuum cavity 7.
Embodiment 4, and with reference to embodiment 3, wireless coupler 5 is positioned at the outside of vacuum cavity 7.
Embodiment 5, a kind of monitoring method of the vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer, wireless vacuum transducer is directly measured the vacuum degree of vacuum extinction chamber interior, by wireless signal mode, be transferred to vacuum-degree monitoring, prior-warning device, show in real time vacuum degree and send vacuum interrupter gas leakage early warning and leakage alarm, realizing operation vacuum degree on-line monitoring and the early warning of electric power vacuum switch.
Vacuum-degree monitoring, prior-warning device are accepted by wireless signal mode after the information of vacuum transducer, can compare with the early warning, the alarm threshold value that arrange, according to result, carry out multistage early warning, warning.
Transmission of wireless signals mode can adopt the wireless and passive mode of electromagnetic resonance coupling, radio frequency signal inquiry according to actual needs, or the wireless transmission mode based on wireless energy supply.
Claims (6)
1. the vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer, comprise A, B, C three-phase vacuum interrupter, it is characterized in that inserting and having or not line vacuum transducer in vacuum interrupter, outdoor vacuum-degree monitoring, the prior-warning device of setting of vacuum extinction, described wireless vacuum transducer adopts wireless signal to be connected with vacuum-degree monitoring, prior-warning device.
2. a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer according to claim 1, it is characterized in that wireless vacuum transducer consists of vacuum degree sensor and wireless coupler, vacuum degree sensor is electrically connected to by lead-in wire with wireless coupler, and described vacuum degree sensor is positioned at the inside of vacuum interrupter or the outside of vacuum interrupter and is communicated with vacuum interrupter inner chamber.
3. a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer according to claim 2, it is characterized in that wireless vacuum transducer adopts embedded mode to insert vacuum interrupter, the vacuum degree sensor that is wireless vacuum transducer is installed on vacuum extinction chamber interior, and wireless coupler is positioned at inside or the vacuum extinction outdoor of vacuum interrupter.
4. a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer according to claim 3, it is characterized in that vacuum degree sensor is fixed on the porcelain shell inner surface of vacuum interrupter, wireless coupler is positioned on the porcelain shell inner surface of vacuum interrupter or the outside of vacuum interrupter.
5. a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer according to claim 2, it is characterized in that wireless vacuum transducer adopts external mode to insert vacuum interrupter, in vacuum extinction outdoor, design a vacuum cavity, described vacuum cavity is tightly connected by vacuum tube and vacuum interrupter, the vacuum degree sensor of wireless vacuum transducer is installed on vacuum cavity inside, and wireless coupler is positioned at the inside of vacuum cavity or the outside of vacuum cavity.
6. a kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer according to claim 1, it is characterized in that vacuum-degree monitoring, prior-warning device comprise wireless antenna, signal processing circuit, input/output interface circuit, display circuit, warning and early warning circuit, described signal processing circuit and wireless antenna, input/output interface circuit, display circuit, warning and early warning circuit be signal communication respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420196031.4U CN204029699U (en) | 2014-04-22 | 2014-04-22 | A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420196031.4U CN204029699U (en) | 2014-04-22 | 2014-04-22 | A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer |
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| CN204029699U true CN204029699U (en) | 2014-12-17 |
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ID=52069533
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| CN201420196031.4U Expired - Fee Related CN204029699U (en) | 2014-04-22 | 2014-04-22 | A kind of vacuum degree on-line monitoring electric power vacuum switch based on wireless vacuum transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037008A (en) * | 2014-04-22 | 2014-09-10 | 江苏南瑞泰事达电气有限公司 | Power vacuum switch with on-line vacuum degree monitoring function based on wireless vacuum sensors, and monitoring method of power vacuum switch |
| CN106197531A (en) * | 2015-04-11 | 2016-12-07 | 金华市威科工贸有限公司 | A kind of Multifunctional coolant measures digital display meter device |
-
2014
- 2014-04-22 CN CN201420196031.4U patent/CN204029699U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037008A (en) * | 2014-04-22 | 2014-09-10 | 江苏南瑞泰事达电气有限公司 | Power vacuum switch with on-line vacuum degree monitoring function based on wireless vacuum sensors, and monitoring method of power vacuum switch |
| CN106197531A (en) * | 2015-04-11 | 2016-12-07 | 金华市威科工贸有限公司 | A kind of Multifunctional coolant measures digital display meter device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 |