CN203707760U - Power distribution devices, protection system and mining electric power monitoring system - Google Patents
Power distribution devices, protection system and mining electric power monitoring system Download PDFInfo
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- CN203707760U CN203707760U CN201420048406.2U CN201420048406U CN203707760U CN 203707760 U CN203707760 U CN 203707760U CN 201420048406 U CN201420048406 U CN 201420048406U CN 203707760 U CN203707760 U CN 203707760U
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- power distribution
- distribution equipment
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- fault
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The utility model discloses power distribution devices. When a short circuit fault exists in a line, protector of the power distribution devices of upper and lower sides of a fault point find out differential flow out-of-limit through interaction information, then emit a short circuit fault trip signal and make a switch in the power distribution device carry out trip so as to remove a fault line. The protector of the power distribution device with a high genetic map ID number priority in the line sends fault information to a background. A decision right is transferred to each power distribution device so that protection reliability is greatly increased. According to the genetic map ID number priority, one or more protectors of the power distribution devices with the high genetic map ID number priority occupy the network when the fault is generated so that communication data is greatly reduced and a possibility of a communication fault is reduced too. In the prior art, previous stage and next stage latching is generated because of the communication fault and protection does not exist. By using the power distribution devices of the utility model, the above situations are avoided. A priority level of the genetic map ID number is taken as a sequence of executing protection motion so that a problem of override trip of the power distribution devices is prevented.
Description
Technical field
The utility model relates to power supply technique field, colliery, relates in particular to a kind of power distribution equipment, protection system and mining electric power monitoring system.
Background technology
In Coal Mine Power Distribution System, from ground transformer substation to down-hole central substation, and between each working face working section sub station, mostly adopt longitudinally, multi-layer, short distance vertical supply pattern.But the circuit of this powering mode distance is short, sectional area is large, makes every section of cable resistance little, and short circuit current is large, and every grade of supply network head and end short circuit current is more or less the same; And condition of power supply is severe under coal mine, humid environment, disturbs morely, and often short trouble appears in a place, and multiple-pole switch is overstep tripping simultaneously, and then causes down-hole large-area power-cuts, has a strong impact on the safety in production of mine.
For avoiding occurring overstep tripping accident; the domestic overcurrent protection technology that has occurred the vertical on line road chain type based on communication network mode before and after 06 year; the overcurrent protection of circuit panel switches at different levels in vertical on line road; form a system through communication transmission passage, form an organic overcurrent protection chain.The basic function that each panel switches in overcurrent protection chain should complete is: the overcurrent condition that detects circuit at the corresponding levels; Transmit testing result at the corresponding levels to upper level switch; Receive the testing result of next stage switch; Determine according to the testing result of testing result at the corresponding levels and next stage whether switch at the corresponding levels trips.The signal intelligence of the real-time monitoring communications passage of each panel switches in chain type overcurrent protection, and can be in the time makeing mistakes and alarm, the mistake action and rejecting action of protection while avoiding communication to make mistakes.Make mistakes for communication, adopted the scheme of backup protection, solved when communicating by letter and made mistakes, rear class switch is the situation because of locking effect tripping to prime switch.
But this scheme is in the time of communication failure, the protection of whole system is failure to actuate because of the reason of front and back level locking, makes described system lose protection, need to adopt the redundant measure of backup protection, makes the time lengthening of tripping operation excision fault.
Utility model content
In view of this, the utility model provides a kind of power distribution equipment, protection system and mining electric power monitoring system, loses the problem of protection situation to solve prior art in the time solving overstep tripping problem because communication failure causes front and back level locking.
To achieve these goals, the existing scheme proposing is as follows:
A kind of power distribution equipment, is applied to mining electric power monitoring system, is connected in the circuit being connected with backstage, comprising:
In the time there is short trouble in described circuit, the protector in the power distribution equipment of upper and lower both sides, fault point sends short trouble trip signal after finding that by interactive information poor stream is out-of-limit; Simultaneously by joining protector in the described power distribution equipment that genome ID priority the is high protector to described backstage transmission fault message in described circuit, described protector is assigned No. ID, the genome that represents each described power distribution equipment priority; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
Trip and excise the switch of faulty line according to described short trouble trip signal, described switch is connected with described protector.
A kind of protection system, is applied to mining electric power monitoring system, comprising:
Multiple power distribution equipments as claimed in claim 1;
Receive the backstage of described fault message.
Preferably, described power distribution equipment is connected in described circuit by optoelectronic composite cable; Wherein, described optoelectronic composite cable is: optical fiber embeds in cable, and enters power distribution equipment wire connection cavity by described cable entry, then accesses the optoelectronic composite cable of protector fiber port through die-casting integral wall penetration optical fibers sleeve pipe.
Preferably, the protector in described power distribution equipment is also: send at regular intervals test data to described backstage, in the time exceeding Preset Time and fail to send described test data, send the protector of fault message report to described backstage;
Described backstage is also: the backstage that receives described test data and fault message report.
Preferably, described protector and switch adopt industrial optical fiber Ethernet to carry out transfer of data.
Preferably, the protector in described power distribution equipment is also: the protector that sends various information about power;
Described backstage is also: receive described various information about power, to described power distribution equipment monitor, analysis, harmonic analysis, coulometric analysis, tracing analysis, and the backstage of accident analysis.
A kind of mining electric power monitoring system, comprising:
By the interconnective each electric substation of optical fiber;
By optical fiber and the interconnective fiber optic Ethernet ring of ring exchanger;
The ground monitoring center being connected with described fiber optic Ethernet ring;
Wherein, described each electric substation comprises: any described a kind of protection system of claim 2 to 6;
Described each electric substation comprises respectively: the first optic fiber converter being connected with the communication bus of each electric substation respectively and the second optic fiber converter; The other end of described the first optic fiber converter and the second optic fiber converter is connected with described optical fiber respectively.
Can find out from above-mentioned technical scheme, the disclosed power distribution equipment of the utility model, in the time there is short circuit in circuit, after protector in the power distribution equipment of upper and lower both sides, fault point finds that by interactive information poor stream is out-of-limit, send short trouble trip signal, the switch of controlling in power distribution equipment trips, excision faulty line, send fault message by the protector of joining in described circuit in the described power distribution equipment that genome ID priority is high to described backstage simultaneously, the disclosed protection system of the utility model, each power distribution equipment is protected location independently, by extremely each power distribution equipment of decentralization of decision making, the reliability of protection is greatly improved, and according to the ID priority level of described genome, can make the moment of breaking down, only have the high power distribution equipment of ID priority of genome described in one or several to take network, communication data greatly reduces, avoid the competition of the communication resource, the judgement time of system is shortened dramatically, avoided losing the generation of protection situation because communication failure causes front and back level locking in prior art simultaneously, fundamentally stop the problem of power distribution equipment overstep tripping as carrying out the order of protection action taking the priority level of No. ID, genome, reduce the down-hole generation of power outage on a large scale, ensure the safe operation of mine power supply system.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment 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 only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the disclosed protection system schematic diagram of the utility model embodiment;
Fig. 2 is the disclosed protection system schematic diagram of another embodiment of the utility model;
Fig. 3 is the disclosed mining electric power monitoring system schematic diagram of another embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of power distribution equipment, is applied to mining electric power monitoring system, is connected in the circuit being connected with backstage, to solve the problem of prior art in the time lengthening of communication failure time tripping operation excision fault.
Concrete, comprising:
Be assigned the protector of No. ID, the genome that represents each described power distribution equipment priority; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
The switch being connected with described protector.
Concrete operation principle is:
In the time there is short trouble in described circuit, the protector in the power distribution equipment of upper and lower both sides, fault point sends short trouble trip signal after finding that by interactive information poor stream is out-of-limit, and the switch of controlling in power distribution equipment trips, excision faulty line; Send fault message by the protector of joining in described circuit in the described power distribution equipment that genome ID priority is high to described backstage simultaneously.
Figure 1 shows that example describes, each power distribution equipment is a node in whole communication network, determine according to the priority of the described power distribution equipment the closer to supply network end is higher No. ID, the genome that represents each power distribution equipment priority, and each genome ID correspondence is dispensed in the protector of each power distribution equipment, protector in every like this station power distribution device can be known for No. ID from the inheritance in topological structure according to the genome that is dispensed to self, break down Anywhere guaranteeing, the protector of corresponding power distribution equipment can preferentially take communication network and carry out communication, in Fig. 1, in the time being short-circuited fault between the 6th power distribution equipment and the 7th power distribution equipment, the 3rd power distribution equipment, the protector of the 4th power distribution equipment and the 5th power distribution equipment all can not reflect described fault, can not apply for taking described communication network yet, the protector of the first power distribution equipment can reflect described fault, but due to the priority level of No. ID, the genome of the first power distribution equipment not as the second power distribution equipment high, carry out fault broadcast so the protector of described the second power distribution equipment will take described communication network.
In concrete practical application, described protector can also specifically comprise high speed digital signal processor DSP and high-precision ADC modular converter and power supply ripple treatment technology, guarantees that the trueness error of protection is controlled at 2%; Adopting the benefit of high speed digital signal processor DSP to be, the DFT(Discrete Fourier Transform of all passages, discrete Fourier transform) computing can in the time of every 1ms, all computing be once.In addition, on bus, the protector of all power distribution equipments can form the vertical poor net of cascade, in the time of busbar fault; all inlet wire power distribution equipments are experienced short circuit current, and all outlet power distribution equipments are all without short circuit current, and system is judged as troubles inside the sample space; tripping circuit breaker, excises fault fast.
The disclosed power distribution equipment of the present embodiment, each power distribution equipment is protected location independently, by extremely each power distribution equipment of decentralization of decision making, the reliability of protection is greatly improved, and according to the ID priority level of described genome, can make the moment of breaking down, only have the protector of the power distribution equipment that the ID priority of genome is high described in one or several to take network, communication data greatly reduces, avoid the competition of the communication resource, reduced the possibility of communication failure simultaneously, avoid losing the generation of protection situation because communication failure causes front and back level locking in prior art, fundamentally stop the problem of power distribution equipment overstep tripping as carrying out the order of protection action taking the priority level of No. ID, genome, reduce the down-hole generation of power outage on a large scale, ensure the safe operation of mine power supply system.
The utility model another embodiment also provide a kind of protection system, is applied to mining electric power monitoring system, comprising:
Multiple power distribution equipments; Described power distribution equipment comprises: the protector that is assigned No. ID, the genome that represents each described power distribution equipment priority; And the switch being connected with described protector; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
Backstage, for receiving described fault message.
Concrete operation principle is same as the previously described embodiments, repeats no more herein.
The utility model another embodiment also provide another protection system, comprising:
Multiple power distribution equipments; Described power distribution equipment comprises: the protector that is assigned No. ID, the genome that represents each described power distribution equipment priority; And the switch being connected with described protector; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
Backstage, for receiving described fault message.
Wherein, described power distribution equipment is connected in described circuit by optoelectronic composite cable; Described optoelectronic composite cable is: optical fiber embeds in cable, and enters power distribution equipment wire connection cavity by described cable entry, then accesses the optoelectronic composite cable of protector fiber port through die-casting integral wall penetration optical fibers sleeve pipe.
Described optoelectronic composite cable completes the function such as downhole data communication, cable monitoring running state by Optical Fiber Transmission; the power distribution equipment at cascade circuit two ends is linked up; form longitudinal difference protection passage, improved the antijamming capability of described power distribution equipment, ensured stability and the reliability of protection action.
All the other features and concrete operation principle are same as the previously described embodiments in the present embodiment, repeat no more herein.
The utility model another embodiment also provide another protection system, comprising:
Multiple power distribution equipments; Described power distribution equipment comprises: the protector that is assigned No. ID, the genome that represents each described power distribution equipment priority; And the switch being connected with described protector; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
Backstage, for receiving described fault message.
In addition, the protector in described power distribution equipment also for: send at regular intervals test data to described backstage, in the time exceeding Preset Time and fail to send described test data, send fault message report to described backstage;
Described backstage also for: receive the report of described test data and fault message.
Concrete operation principle is:
Between the protector in described power distribution equipment, send at regular intervals test data to described backstage, whether normal with checking Networks of Fiber Communications, in the time exceeding Preset Time and fail to send described test data, send fault messages report to described backstages by 485 communication networks;
Described backstage receives described test data and fault message report.
Because adopt the judgment mode of genome, lineal higher level's power distribution equipment of described fault power distribution equipment becomes upgrading the backup protection power distribution equipment of described fault power distribution equipment
Describe as an example of Fig. 2 example, the first power distribution equipment 1DL between ground transformer substation and central substation and the second power distribution equipment 2DL, and the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL between central substation and working section sub station is cascade power distribution equipment, its main protection is 0 second cascade longitudinal difference protection, and backup protection is the overcurrent protection with the time limit; The 5th power distribution equipment 5DL and the 6th power distribution equipment 6DL under working section sub station are load-carrying power distribution equipment, and its main protection is 0 second short-circuit protection and the overload protection with the time limit.
If when cascade line short between the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL; the first power distribution equipment 1DL, the second power distribution equipment 2DL, the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL have all experienced short circuit current, and all the other power distribution equipments flow through without short circuit current; Spill current between the first power distribution equipment 1DL and the second power distribution equipment 2DL is 0, so its cascade longitudinal difference protection is all failure to actuate; Spill current between the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL is short circuit current, both actions in equal 0 second, the cascade circuit of isolation short circuit.
If when the 6th power distribution equipment 6DL short circuit, the first power distribution equipment 1DL, the second power distribution equipment 2DL, the 3rd power distribution equipment 3DL, the 4th power distribution equipment 4DL and the 6th power distribution equipment 6DL have all experienced short circuit current; Wherein, between the first power distribution equipment 1DL and the second power distribution equipment 2DL, and spill current between the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL is 0, so its cascade longitudinal difference protection is all failure to actuate; The 6th power distribution equipment 6DL0 moves second, excision fault; When the 6th power distribution equipment 6DL short circuit and while breaking down tripping, its higher level's power distribution equipment the 4th power distribution equipment 4DL upgrades to backup protection power distribution equipment, carries out overcurrent protection action, excision fault.
If when bus breaks down, the first power distribution equipment 1DL, the second power distribution equipment 2DL, the 3rd power distribution equipment 3DL and the 4th power distribution equipment 4DL have all experienced short circuit current, spill current is 0, and its cascade longitudinal difference protection is all failure to actuate; Exceed after Preset Time, the 4th power distribution equipment 4DL carries out overcurrent protection action, excision fault bus; Wherein, the overcurrent protection delay time definite value of the first power distribution equipment 1DL can be set as 0.5S, the overcurrent protection delay time definite value of the second power distribution equipment 2DL and the 3rd power distribution equipment 3DL can be set as 0.35S, and the overcurrent protection delay time definite value of the 4th power distribution equipment 4DL can be set as 0.2S; Its default overcurrent protection delay time can be determined according to concrete actual conditions.
The disclosed protection system of the present embodiment, not only can excise fault fast, and has avoided losing the generation of protection situation because communication failure causes front and back level locking in prior art; Meanwhile, for each power distribution equipment provides backup protection power distribution equipment, ensured effective execution of protection action.
All the other features and concrete operation principle are same as the previously described embodiments in the present embodiment, repeat no more herein.
Preferably, the utility model another embodiment also provide another protection system, and wherein, described protector and switch adopt industrial optical fiber Ethernet to carry out transfer of data.
The high-speed communication networking that adopts industrial optical fiber Ethernet to form can make can, with extremely short time communication, such as the time that any two station power distribution devices can be completed to a session is controlled in 3ms, be conducive to excise fast fault between any two station power distribution devices.
In concrete actual use, communication and the exchanges data of industrial optical fiber Ethernet net can adopt interrupt processing technology, can make like this fault message send at once, online all power distribution equipments can receive at once, guarantee to transmit between power distribution equipment the real-time of information.
All the other features and concrete operation principle are same as the previously described embodiments in the present embodiment, repeat no more herein.
Preferably, the protector in described power distribution equipment is also: the protector that sends various information about power;
Described backstage is also: receive described various information about power, to described power distribution equipment monitor, analysis, harmonic analysis, coulometric analysis, tracing analysis, and the backstage of accident analysis.
Described backstage receives described various information about power, to realize monitoring, analysis, harmonic analysis, the coulometric analysis to described power distribution equipment, and tracing analysis, and the various monitoring functions such as accident analysis.
In concrete practical application, the functional item that described backstage is monitored and analyzed described power distribution equipment is not defined as above-mentioned listed content, can be configured according to actual needs, to be applicable to concrete environment for use.
Another embodiment of the utility model also provides a kind of mining electric power monitoring system, as shown in Figure 3, comprising:
By the interconnective each electric substation of optical fiber; As ground transformer substation 101, central substation 102 and working section sub station 103;
By optical fiber and the interconnective fiber optic Ethernet ring of ring exchanger 104;
The ground monitoring center being connected with fiber optic Ethernet ring;
Wherein, described each electric substation comprises: any one protection system described in above-described embodiment;
Described each electric substation comprises respectively: the first optic fiber converter 105 being connected with the communication bus of described each electric substation respectively and the second optic fiber converter 106; The other end of the first optic fiber converter 105 and the second optic fiber converter 106 is connected with described optical fiber respectively.
The differential connection of the interconnection power distribution equipment of each electric substation connects together, form a high speed communication bus, convert electrical signals to light signal by the first optic fiber converter 105 and the second optic fiber converter 106 again, incoming fiber optic Ethernet ring, is connected in the bus of another electric substation.Form like this high speed communication bus system of a full electric network.This high speed communication bus system has formed redundant network too, to improve communication reliability.
All the other features and concrete operation principle are same as the previously described embodiments in the present embodiment, repeat no more herein.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a power distribution equipment, is applied to mining electric power monitoring system, is connected in the circuit being connected with backstage, it is characterized in that, comprising:
In the time there is short trouble in described circuit, the protector in the power distribution equipment of upper and lower both sides, fault point sends short trouble trip signal after finding that by interactive information poor stream is out-of-limit; Simultaneously by joining protector in the described power distribution equipment that genome ID priority the is high protector to described backstage transmission fault message in described circuit, described protector is assigned No. ID, the genome that represents each described power distribution equipment priority; Wherein, higher the closer to the priority of the described power distribution equipment of supply network end;
Trip and excise the switch of faulty line according to described short trouble trip signal, described switch is connected with described protector.
2. a protection system, is applied to mining electric power monitoring system, it is characterized in that, comprising:
Multiple power distribution equipments as claimed in claim 1;
Receive the backstage of described fault message.
3. protection system according to claim 2, is characterized in that, described power distribution equipment is connected in described circuit by optoelectronic composite cable; Wherein, described optoelectronic composite cable is: optical fiber embeds in cable, and enters power distribution equipment wire connection cavity by described cable entry, then accesses the optoelectronic composite cable of protector fiber port through die-casting integral wall penetration optical fibers sleeve pipe.
4. protection system according to claim 2, it is characterized in that, protector in described power distribution equipment is also: send at regular intervals test data to described backstage, in the time exceeding Preset Time and fail to send described test data, send the protector of fault message report to described backstage;
Described backstage is also: the backstage that receives described test data and fault message report.
5. protection system according to claim 2, is characterized in that, described protector and switch adopt industrial optical fiber Ethernet to carry out transfer of data.
6. protection system according to claim 2, is characterized in that, the protector in described power distribution equipment is also: the protector that sends various information about power;
Described backstage is also: receive described various information about power, to described power distribution equipment monitor, analysis, harmonic analysis, coulometric analysis, tracing analysis, and the backstage of accident analysis.
7. a mining electric power monitoring system, is characterized in that, comprising:
By the interconnective each electric substation of optical fiber;
By optical fiber and the interconnective fiber optic Ethernet ring of ring exchanger;
The ground monitoring center being connected with described fiber optic Ethernet ring;
Wherein, described each electric substation comprises: any described a kind of protection system of claim 2 to 6;
Described each electric substation comprises respectively: the first optic fiber converter being connected with the communication bus of each electric substation respectively and the second optic fiber converter; The other end of described the first optic fiber converter and the second optic fiber converter is connected with described optical fiber respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420048406.2U CN203707760U (en) | 2014-01-24 | 2014-01-24 | Power distribution devices, protection system and mining electric power monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420048406.2U CN203707760U (en) | 2014-01-24 | 2014-01-24 | Power distribution devices, protection system and mining electric power monitoring system |
Publications (1)
| Publication Number | Publication Date |
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| CN203707760U true CN203707760U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420048406.2U Expired - Fee Related CN203707760U (en) | 2014-01-24 | 2014-01-24 | Power distribution devices, protection system and mining electric power monitoring system |
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| CN (1) | CN203707760U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730885A (en) * | 2014-01-24 | 2014-04-16 | 兖州东方机电有限公司 | Power distribution device, protective system, mining power monitoring system and protection method |
| CN114400779A (en) * | 2022-01-18 | 2022-04-26 | 上海山源电子科技股份有限公司 | Rapid networking system and rapid networking method for underground unattended substation |
-
2014
- 2014-01-24 CN CN201420048406.2U patent/CN203707760U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730885A (en) * | 2014-01-24 | 2014-04-16 | 兖州东方机电有限公司 | Power distribution device, protective system, mining power monitoring system and protection method |
| CN114400779A (en) * | 2022-01-18 | 2022-04-26 | 上海山源电子科技股份有限公司 | Rapid networking system and rapid networking method for underground unattended substation |
| CN114400779B (en) * | 2022-01-18 | 2022-11-04 | 上海山源电子科技股份有限公司 | Rapid networking system and rapid networking method for underground unattended substation |
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Granted publication date: 20140709 Termination date: 20190124 |