CN201935980U - Power distribution network failure detector - Google Patents
Power distribution network failure detector Download PDFInfo
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- CN201935980U CN201935980U CN2011200043969U CN201120004396U CN201935980U CN 201935980 U CN201935980 U CN 201935980U CN 2011200043969 U CN2011200043969 U CN 2011200043969U CN 201120004396 U CN201120004396 U CN 201120004396U CN 201935980 U CN201935980 U CN 201935980U
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a power distribution network failure detector which comprises a first short circuit sensor, a second short circuit sensor and a third short circuit senor respectively arranged on a three-phase cable, a grounding sensor arranged on a three-core cable, and a main engine connected with the grounding sensor through cables. The first short circuit sensor, the second short circuit sensor and the third short circuit senor are respectively connected with the grounding sensor through fibers; the cables comprise a communication cable and a power cable; the communication cable is used for realizing signal transmission between the grounding sensor and the main engine; and the power cable is used for providing power supply to the grounding sensor. The power distribution network failure detector provided by the embodiment of the utility model is convenient to timely locate and repair circuit failures; meanwhile, the power distribution network failure detector does not need a battery to supply power; therefore, the service life of the power distribution network failure detector can be effectively prolonged and the working load on maintenance is reduced; in this way, the power distribution network failure detector can be better suitable for the field of power distribution network failure detection.
Description
Technical field:
The utility model relates to system for distribution network of power network maintenance technology field, relates in particular to a kind of distribution network failure detector.
Background technology:
In the system for distribution network of power network, city looped network for example, if in a certain level distribution network duplexure short circuit or earth fault have taken place, the relay protection system of this distribution network upper level must be carried out disjunction in the certain hour section.After disjunction protection process is finished, can cause all duplexures that belong to this distribution network all to cut off the power supply.In order to repair fault as soon as possible, recover electric power supply, need a kind of distribution network failure detector, be used for after the distribution network outage can be promptly and accurately location and indication fault point.
Generally independent being arranged in the distribution network of distribution network failure detector commonly used at present, it can't or be difficult to upload to fault detect information in the electric power management system automatically, therefore electric power management system is difficult to get access to timely failure message, can not satisfy the demand of electrical network intelligent management, cause to locate and to repair fault timely.Simultaneously, existing distribution network failure detector generally adopts powered battery, because the power supply capacity of battery is limited, and battery drain is serious under wet environment, the serviceable life of this failure detector is lower, maintenance workload is bigger, can not be applicable to distribution network fault detect field preferably.
The utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of distribution network failure detector, to realize uploading to fault detect information in the electric power management system automatically, be convenient to locate timely and repair fault, realize need not powered battery simultaneously, improve the serviceable life of failure detector, reduce maintenance workload, make the distribution network fault detect field that is applicable to that it can be preferable.
The utility model embodiment provides following technical scheme:
A kind of distribution network failure detector comprises:
Be separately positioned on first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor on the threephase cable;
Be arranged on the grounding sensor on the triple cable, described first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor are connected with described grounding sensor by optical fiber respectively;
The main frame that is connected with described grounding sensor by cable;
Described first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor are used for obtaining respectively the short trouble signal of threephase cable, and send to described main frame by optical fiber, grounding sensor and cable successively;
Described grounding sensor is used to obtain the earth fault signal, and sends to described main frame by cable;
Described cable comprises the communications cable and electric power cable, the described communications cable be used to be grounded sensor and main frame between the signal transmission, described electric power cable is used for providing electric power supply to grounding sensor;
Described main frame is used for receiving and handling described short trouble signal and earth fault signal.
Compared with prior art, technique scheme has the following advantages:
In the distribution network failure detector that the utility model embodiment is provided, grounding sensor and short-circuit sensor have been connected by the optical fiber that is provided with, and grounding sensor and main frame have been connected by cable, therefore, can upload in the electric power management system automatically short circuit and earth fault information in real time, can satisfy the demand of electrical network intelligent management, be convenient to locate timely and repair fault.Simultaneously, comprised the electric power cable that electric power supply can be provided for this device in the cable that present embodiment provides, therefore, this device need not to use powered battery, can effectively improve the serviceable life of this device, reduce maintenance workload, make the distribution network fault detect field that is applicable to that it can be preferable.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The distribution network failure detector structural representation that Fig. 1 provides for embodiment one;
Short circuit sensor construction synoptic diagram in the distribution network failure detector that Fig. 2 provides for embodiment two;
Grounding sensor structural representation in the distribution network failure detector that Fig. 3 provides for embodiment two;
Main machine structure synoptic diagram in the distribution network failure detector that Fig. 4 provides for embodiment two.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
A lot of details have been set forth in the following description so that fully understand the utility model, but the utility model can also adopt other to be different from alternate manner described here and implement, those skilled in the art can do similar popularization under the situation of the utility model intension, so the utility model is not subjected to the restriction of following public specific embodiment.
Embodiment one:
Present embodiment provides a kind of distribution network failure detector, as shown in Figure 1, is a kind of structural representation of this device, and this device specifically comprises:
Be separately positioned on first short-circuit sensor 101, second short-circuit sensor 102 and the 3rd short-circuit sensor 103 on the threephase cable;
Be arranged on the grounding sensor 104 on the triple cable, described first short-circuit sensor 101, second short-circuit sensor 102 are connected with described grounding sensor 104 by optical fiber 105 respectively with the 3rd short-circuit sensor 103;
The main frame 107 that is connected with described grounding sensor 104 by cable 106;
Described first short-circuit sensor 101, second short-circuit sensor 102 and the 3rd short-circuit sensor 103 are used for obtaining respectively the short trouble signal of threephase cable A, B and C, and send to described main frame 107 by optical fiber 105, grounding sensor 104 and cable 106 successively;
Described grounding sensor 104 is used to obtain the earth fault signal, and sends to described main frame 107 by cable 106;
Described cable 106 comprises the communications cable and electric power cable (not shown), the described communications cable be used to be grounded sensor 104 and main frame 107 between the signal transmission, described electric power cable is used for providing electric power supply to grounding sensor 104;
Described main frame 107 is used for receiving and handling described short trouble signal and earth fault signal.
In the distribution network failure detector that present embodiment provides, grounding sensor and short-circuit sensor have been connected by the optical fiber that is provided with, and grounding sensor and main frame have been connected by cable, therefore, can upload in the electric power management system automatically short circuit and earth fault information in real time, can satisfy the demand of electrical network intelligent management, be convenient to locate timely and repair fault.Simultaneously, comprised the electric power cable that electric power supply can be provided for this device in the cable that present embodiment provides, therefore, this device need not to use powered battery, can effectively improve the serviceable life of this device, reduce maintenance workload, make the distribution network fault detect field that is applicable to that it can be preferable
Embodiment two:
On the basis of embodiment one disclosed distribution network failure detector, present embodiment provides a kind of concrete structure of grounding sensor, short-circuit sensor and main frame described in this pick-up unit.
As shown in Figure 2, a kind of structural representation of the short-circuit sensor described in the distribution network failure detector that provides for present embodiment, this short-circuit sensor comprises:
The short trouble signal gathering unit 201 that is connected successively, short trouble signal processing unit 202 and photoelectric conversion unit 203;
The short trouble signal that described short trouble signal gathering unit 201 is used to gather, and send to described short trouble signal processing unit 202;
Short trouble signal processing unit 202 is used for analyzing and processing and handles the short trouble signal, and sends to photoelectric conversion unit 203;
Described photoelectric conversion unit 203 is used for the short trouble conversion of signals to be light signal and to send to described grounding sensor by described optical cable.
Described short-circuit sensor detects the moment saltus step, that surpass a certain threshold value of normal load electric current, very short fault-signal of duration, this fault-signal drives electrooptic switching element 203 simultaneously, make super bright lumination of light emitting diode, light is sent on the grounding sensor through optical fiber again.
As shown in Figure 2, described short trouble signal gathering unit 201 can be an electromagnetic induction I/V transducer, be installed on each phase phase line, its output signal enters described short trouble signal processing unit 202, described short trouble signal processing unit 202 output signals drive electrooptic switching element 203, carry out making super bright lumination of light emitting diode after the opto-electronic conversion, light is sent on the grounding sensor through optical fiber again.
Among Fig. 2, induction I/V transducer shown in the short trouble signal gathering unit 201, the signal voltage Vsf of secondary winding, enter the short trouble signal processing unit 202 on dotted line right side, described short trouble signal processing unit 202 can comprise: the holding circuit 2021 that is connected successively, two-way peak-detector circuit 2022, sample circuit 2023 and comparator circuit 2024;
The reference power supply 2025 that is connected with described comparator circuit 2024;
The stabilized voltage supply 2026 that is connected with described reference power supply 2025 with described two-way peak-detector circuit 2022 respectively.Described comparator circuit 2024 is connected to described photoelectric conversion unit 203.
Described signal voltage Vsf is successively through the holding circuit 2021 of anti-overvoltage, overcurrent and thunderbolt; two-way peak-detector circuit 2022; signal voltage Vs behind the sample circuit 2023; input comparator circuit 2024; reference power supply 2025 is used for providing reference voltage V r to comparator circuit 2024; when comparative result has output signal; then pass through photoelectric conversion unit 203; convert light pulse signal to; enter optical cable; to grounding sensor output, wherein, stabilized voltage supply 2026 is used for providing electric power supply to each assembly of short-circuit sensor.
Two-way peak-detector circuit 2022 takes out the peak value of voltage signal, delivers to comparator circuit 2024 through sample circuit 2023 and compares with 2.5V reference voltage V r.
Sampled voltage VS is demarcated by the up-flow generator, and as Vs during greater than reference voltage V r, comparator circuit 204 produces upset, and the driven for emitting lights diode (LED) produces light signal, sends the short trouble signal to grounding sensor by optical cable.
The power supply that provides the short-circuit sensor electronic circuit required can also be provided two-way peak-detector circuit 2022, the pulsating direct current that this circuit produces is through filtering, voltage stabilizing, provide one stable, the 5V voltage vcc that ripple factor is very little uses for reference power supply 2025 and other circuit.
Grounding sensor is connected to main frame by cable, cable not only comprises the communications cable of two-way communication, comprise that also host power supply is incorporated into the electric power cable of grounding sensor, zero-sequence current size when the grounding sensor detection line normally moves adopts automatic overcurrent limit value and the current changing rate of adjusting as the fault judgement foundation of recursive algorithm.
A kind of structural representation of the grounding sensor described in the distribution network failure detector that provides for present embodiment as Fig. 3, this grounding sensor comprises:
The earth fault signal gathering unit 301 that is connected successively, earth fault signal processing unit 302, main processor unit 303 and communication unit 304;
The photosensitive receiving circuit 305 that is connected with described main processor unit 303;
Described earth fault signal gathering unit 301 is used to gather the earth fault signal, and sends to earth fault signal processing unit 302; Described earth fault signal processing unit 302 is used for and will sends to main processor unit 303 after earth fault signal rectification, the amplification; Described photosensitive receiving circuit 305 is used for receiving the short trouble signal that short-circuit sensor sends by optical fiber, and sends to main processor unit 303; Described main processor unit 303 is used to receive short trouble signal and earth fault signal, and sends to described communication unit 304 after the sampling analysis; Described communication unit 304 is used to realize the information transmission with described main frame.
In addition, described grounding sensor can also comprise that electric power supply unit 306, one ends are connected to described electric power cable, is used to obtain electric power supply, and be connected respectively to grounding sensor other form module and provide electric power supply for it.
Described earth fault signal gathering unit 301 can be electromagnetic induction I/V transducer, is installed on the triple cable line, and the earth fault signal of its output enters described earth fault signal processing unit 302.Described earth fault signal processing unit 302 is used for the earth fault signal is carried out rectification and amplification, can comprise signal rectifier circuit 3021 and signal amplification circuit 3022.The earth fault signal of output enters main processor unit 303 after earth fault signal processing unit 302 is handled, and sends to described communication unit 304 after main processor unit 303 samplings, storage, analyzing and processing, and sends to main frame by communication unit 304.
In addition; described grounding sensor can also comprise the holding circuit 307 that is connected between earth fault signal gathering unit 301 and the earth fault signal processing unit 302; earth fault signal gathering unit 301 shown in Fig. 3 left side is induction I/V transducers, and the signal voltage Vsf of its secondary winding is at first through the holding circuit 307 of anti-overvoltage, overcurrent and thunderbolt.Holding circuit 307 adopts resettable fuse and two-way solid-state TVS pipe to do the inhibition and the absorption of surge voltages such as thunder and lightning, electric network peak, and the overcurrent that causes for grounding sensor itself has protective effect equally.
This is amplified into main processor unit 303 through rectification, filtering, signal successively the earth fault signal.Signal rectifier circuit 3021 is realized the conversion of AC signal to direct current.For realizing high-precision data sampling, signal rectifier circuit 3021 can adopt double operational to carry out rectification, and can carry out the adjusting at zero point by the bleeder circuit that potentiometer constitutes, signal carries out filtering, amplification after the rectification, be transformed to the direct current signal of a reflection earth-fault current size, be input to the analog to digital conversion mouth of main processor unit 303, carry out the sampling of parameter by main processor unit 303.Main processor unit 303 employing programs to the earth fault signal sample, filtering, storage post analysis relatively.
The determination methods of earth fault comprises two foundations, the one, with the signal that samples in this sampling period and the signal in the last sampling period relatively, if this sampled signal surpasses a threshold value greater than sampled signal last time, then as fault judgement according to one of; Another fault judgement surpasses a threshold value according to being that preceding N sampled signal averaged if this sampled signal is compared with average, then as another failure criterion, when two failure criterions are all satisfied, then thinks earth fault has taken place.For automatically adapting to the ground current size variation that causes because of System Expansion etc., the size of ground signalling average is fixing, but to N sampled signal recursion, the sampled signal of oldest stored is replaced by this sampled signal.
The determination methods of above-mentioned earth fault can automatically adapt to the fluctuation of ground signalling compared with prior art, and its failure judgment is more accurate, particularly in small current system, can effectively avoid the phenomenon of judging by accident and failing to judge.
As shown in Figure 4, a kind of structural representation of the main frame that provides for present embodiment, described main frame comprises:
By first communication unit 401 that cable is connected with described grounding sensor, be used to realize communications with grounding sensor;
With the CPU (central processing unit) 402 that described first communication unit 401 is connected, be used for described short trouble signal of analyzing and processing and earth fault signal;
With the second communication unit 403 that described CPU (central processing unit) 402 is connected, be used to export short trouble signal and earth fault signal after central processing unit for processing 402;
Each forms the power conversion unit 404 that module is connected with electric power cable and main frame, is used for providing electric power supply to main frame and described grounding sensor.
In addition, described main frame can also comprise:
The warning indicating member 405 that is connected with CPU (central processing unit) 402 is used for sending a warning according to the instruction of CPU (central processing unit) 402.What warning indicating member 405 was concrete can be display screen or LED light.
In order to realize the storage failure signal data, described main frame can also comprise:
The data storage cell 406 that is connected with CPU (central processing unit) 402 is used to receive and store the data that CPU (central processing unit) 402 sends.
Described first communication unit 401 and described second communication unit 403 all can be the serial communication unit of MODBUS (RTU) agreement that adopts 485 serial communications and standard, respectively with grounding sensor and higher level FTU (Feeder Terminal Unit, the line feed terminals device) equipment connects, and realizes reading each grounding sensor parameter and with the function of failure message and acquisition parameter output.
The RXD/TXD pin sampled light lotus root 6N137 of communication unit and CPU (central processing unit) 402 isolates, and to prevent the influence of undesired signal, chip 75176 is realized the driving of serial communication signals.The storage chip of data storage cell 406 can adopt AT24C02, and this chip is the I2C interface, and is simple with CPU (central processing unit) 402 interfaces, and employing software and certain pulses signal can be realized the storage of signal and read.This main frame can also comprise the output driving circuit (not shown), and after CPU (central processing unit) 402 received ground connection or short trouble, respective pin output high-low level was lighted the LED lamp and reported to the police.CPU (central processing unit) 402 can adopt the MSP430 series monolithic of two serial ports, and this single-chip microcomputer has super low-power consumption, can save power consumption.Power conversion unit 404 can adopt DC/DC conversion chip TPS5401 that the outside input DC power of 12～24V at first is converted to+use of 5V direct current supply road, adopt step-down chip LM1117-3.3 general+5V direct current to be converted to 3.3V again, use for CPU (central processing unit) 402 and other circuit.
Present embodiment is a kind of concrete implementation structure that provides on the basis of embodiment one disclosed distribution network failure detector, but its part cross-references does not roughly the same repeat them here.
In the distribution network failure detector that the utility model embodiment provides, grounding sensor and short-circuit sensor have been connected by the optical fiber that is provided with, and grounding sensor and main frame have been connected by cable, therefore, can upload in the electric power management system automatically short circuit and earth fault information in real time, can satisfy the demand of electrical network intelligent management, be convenient to locate timely and repair fault.Simultaneously, comprised the electric power cable that electric power supply can be provided for this device in the cable that present embodiment provides, therefore, this device need not to use powered battery, can effectively improve the serviceable life of this device, reduce maintenance workload, make the distribution network fault detect field that is applicable to that it can be preferable.
Various piece adopts the mode of going forward one by one to describe in this instructions, and what each part stressed all is and the difference of other parts that identical similar part is mutually referring to getting final product between the various piece.To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to embodiment illustrated herein, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. a distribution network failure detector is characterized in that, comprising:
Be separately positioned on first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor on the threephase cable;
Be arranged on the grounding sensor on the triple cable, described first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor are connected with described grounding sensor by optical fiber respectively;
The main frame that is connected with described grounding sensor by cable;
Described first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor are used for obtaining respectively the short trouble signal of threephase cable, and send to described main frame by optical fiber, grounding sensor and cable successively;
Described grounding sensor is used to obtain the earth fault signal, and sends to described main frame by cable;
Described cable comprises the communications cable and electric power cable, the described communications cable be used to be grounded sensor and main frame between the signal transmission, described electric power cable is used for providing electric power supply to grounding sensor;
Described main frame is used for receiving and handling described short trouble signal and earth fault signal.
2. distribution network failure detector according to claim 1 is characterized in that:
Described first short-circuit sensor, second short-circuit sensor and the 3rd short-circuit sensor comprise respectively:
The short trouble signal gathering unit that is connected successively, short trouble signal processing unit and photoelectric conversion unit;
The short trouble signal that described short trouble signal gathering unit is used to gather, and send to described short trouble signal processing unit;
The short trouble signal processing unit is used for analyzing and processing and handles the short trouble signal, and sends to photoelectric conversion unit;
Described photoelectric conversion unit is used for the short trouble conversion of signals to be light signal and to send to described grounding sensor by described optical cable.
3. distribution network failure detector according to claim 2 is characterized in that:
Described short trouble signal gathering unit is an electromagnetic induction I/V transducer.
4. distribution network failure detector according to claim 2 is characterized in that, described short trouble signal processing unit comprises:
The holding circuit that is connected successively, two-way peak-detector circuit, sample circuit and comparator circuit;
The reference power supply that is connected with described comparator circuit;
The stabilized voltage supply that is connected with described reference power supply with described two-way peak-detector circuit respectively;
Described comparator circuit is connected to described photoelectric conversion unit.
5. distribution network failure detector according to claim 1 is characterized in that, described grounding sensor comprises:
The earth fault signal gathering unit that is connected successively, earth fault signal processing unit, main processor unit and communication unit;
The photosensitive receiving circuit that is connected with described main processor unit;
Described earth fault signal gathering unit is used to gather the earth fault signal, and sends to the earth fault signal processing unit;
Described earth fault signal processing unit is used for and will sends to main processor unit after earth fault signal rectification, the amplification;
Described photosensitive receiving circuit is used to receive the short trouble signal that described short-circuit sensor sends, and sends to main processor unit;
Described main processor unit is used to receive short trouble signal and earth fault signal, and sends to described communication unit after the sampling analysis;
Described communication unit is used to realize the information transmission with described main frame.
6. distribution network failure detector according to claim 5 is characterized in that, described earth fault signal processing unit comprises:
The signal rectifier circuit that links to each other with the earth fault signal gathering unit;
Be connected the signal amplification circuit between signal rectifier circuit and the main processor unit.
7. distribution network failure detector according to claim 5 is characterized in that, described earth fault signal processing unit also comprises:
Electric power supply unit, an end is connected to described electric power cable, is used to obtain electric power supply, and be connected respectively to grounding sensor other form module and provide electric power supply for it.
8. distribution network failure detector according to claim 1 is characterized in that, described main frame comprises:
By first communication unit that cable is connected with described grounding sensor, be used to realize communications with grounding sensor;
With the CPU (central processing unit) that described first communication unit is connected, be used for described short trouble signal of analyzing and processing and earth fault signal;
The second communication unit that is connected with described CPU (central processing unit) is used to export short trouble signal and earth fault signal after central processing unit for processing;
Each forms the power conversion unit that module is connected with described electric power cable and main frame, is used for providing electric power supply to main frame and described grounding sensor.
9. distribution network failure detector according to claim 8 is characterized in that, described main frame also comprises:
The warning indicating member that is connected with CPU (central processing unit) is used for sending a warning according to the instruction of CPU (central processing unit).
10. distribution network failure detector according to claim 8 is characterized in that, described main frame also comprises:
The data storage cell that is connected with CPU (central processing unit) is used to receive and store the data that CPU (central processing unit) sends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200043969U CN201935980U (en) | 2011-01-07 | 2011-01-07 | Power distribution network failure detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200043969U CN201935980U (en) | 2011-01-07 | 2011-01-07 | Power distribution network failure detector |
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| CN201935980U true CN201935980U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200043969U Expired - Fee Related CN201935980U (en) | 2011-01-07 | 2011-01-07 | Power distribution network failure detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129008A (en) * | 2011-01-07 | 2011-07-20 | 杭州市电力局 | Fault detection device for distribution network |
| CN106324434A (en) * | 2016-08-31 | 2017-01-11 | 国网山东省电力公司菏泽供电公司 | Intelligent operation detection method for cable |
-
2011
- 2011-01-07 CN CN2011200043969U patent/CN201935980U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129008A (en) * | 2011-01-07 | 2011-07-20 | 杭州市电力局 | Fault detection device for distribution network |
| CN106324434A (en) * | 2016-08-31 | 2017-01-11 | 国网山东省电力公司菏泽供电公司 | Intelligent operation detection method for cable |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20110817 Termination date: 20180107 |