CN204177910U - A kind of intelligent grid sensing device - Google Patents
A kind of intelligent grid sensing device Download PDFInfo
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- CN204177910U CN204177910U CN201420693335.1U CN201420693335U CN204177910U CN 204177910 U CN204177910 U CN 204177910U CN 201420693335 U CN201420693335 U CN 201420693335U CN 204177910 U CN204177910 U CN 204177910U
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Abstract
The utility model discloses a kind of intelligent grid sensing device, it comprises central processing unit, and GPS, Large Volume Data impact damper, temperature sensor, high-precision adc, induction power-supply circuit, short-range wireless communication module, the remote-wireless communication module to be connected with central processing unit, described central processing unit is also connected with digital to analog converter, this digital to analog converter connects crystal oscillator, and described crystal oscillator is connected with central processing unit.It adopts the mode from the power taking of power induction electric current, to device self-powered, does not need external power supply and battery; Not power restriction by single ended power supply, affect little by factors such as the fluctuation of load, harmonic wave, stake resistance and fault close angles; Fault signature extracts and effectively make use of primary fault transient information and to client information, can effectively solve single-phase grounded malfunction in grounded system of low current route selection and orientation problem.
Description
Technical field
The utility model relates to a kind of intelligent grid sensing device in below 35kV distribution network system.
Background technology
State Grid Corporation of China has proposed the developing goal of the strong intelligent grid of all-round construction, and electric network state detection technique is that raising smart grid security maintenance level and power equipment management benefit provide strong technical support.
Intelligent distribution system three general objective: safe and reliable, high-quality and efficient, interactive flexibly.In intelligent grid, the priority project of distribution link comprises: distribution network structure construction and transformation, power distribution automation pilot with practical, associate and integrate relevant information island, the access of distribution power and the interactive application etc. of control and distribution system.In order to meet the requirement of user to power supply reliability, the quality of power supply and good service, meet distributed power source, to concentrate and the unperturbed of distributed energy storage accesses, distribution system operational mode traditional in following electrical network and management method are urgently improved; Intelligent power distribution network is the foundation stone of strong intelligent grid, strong in extra-high voltage, and intelligence is at power distribution network.
There is many drawbacks in existing electrical power distribution automatization system:
(1) lack on-line measurement data, circuit ruuning situation cannot be learned in time;
(2) malfunction elimination location efficiency is extremely low, even needs artificial power failure to come trouble-shooting circuit and the position of fault;
(3) be security consideration, general only conveying, far below the power of rated line capacity, causes existing power distribution network greatly to be wasted.
And there is following problem in existing line selection apparatus or fault detector:
(1) line selection apparatus method is single.Generally be confined to adopt realizing than a certain selection methods such as width phase comparing method, quintuple harmonics method, energy function method, wavelet method of single-end electrical quantity, success ratio is extremely low;
(2) conventional failure indicator is based on local excess current, is only suitable for single ended power supply circuit, and powered battery, the life-span is short, perishable.
35kV and following power distribution network generally run by small current neutral grounding (isolated neutral or through grounding through arc) mode, and its major advantage is when system generation singlephase earth fault, and stable fault currents is little, and system can continue operation 2 to 3 hours.For single-phase transient earthing fault, trouble spot electric arc can self-extinguish; For single-phase continuous earth, system temporarily can run a few hours by tape jam, and therefore domestic 35kV and following power distribution network mostly adopt this earthing mode.Its shortcoming is that when there is single-phase continuous earth fault, which bar line fault is difficult to detect is.Because fault can cause healthy phases voltage significantly to raise, and intermittent arc grounding may cause electric arc superpotential, threaten system equipment insulation safety, long period operation may cause insulation breakdown that pernicious phase-to phase fault occurs, faulty line need be determined as early as possible, fix a breakdown, otherwise have large potential safety hazard.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model is to provide one energy automatic route selection when small current neutral grounding system generation singlephase earth fault, and can realize the device of quick position faulty line.
For achieving the above object, the utility model have employed following technical scheme:
A kind of intelligent grid sensing device, it comprises:
Central processing unit, for being realized the real-time sampling to power line current by control high-precision adc, realized power voltage line collection by control temperature sensor and be converted into temperature data, and to the parsing of the initialization of GPS device, timing information and geographic coordinate information and process, and to the initialization of short range communicator and telecommunication device and communication scheduling;
GPS, for loading precise time label to sampled data;
Large Volume Data impact damper, for the real time temperature of the store electricity line of force within the scope of setting-up time, electric current and voltage data;
Temperature sensor, this sensor directly contacts with line of electric force, for converting the temperature of the line of electric force recorded to voltage signal;
High-precision adc, for power line current real time data sampling;
Short-distance wireless communication device, for be arranged on adjacent intelligent grid sensing device between intercommunication mutually, then by main device to the intelligent grid sensing device of adjacent unified carry out data acquisition, distribution and and the communication on far-end backstage;
Remote-wireless communicator, for the data communication between intelligent grid sensing device and backstage;
Digital to analog converter, for being converted to analog voltage signal by the clock jitter that central processing unit calculates from digital signal; And
Crystal oscillator, for providing high-precision work clock to central processing unit, carries out automatic frequency calibration according to the pps pulse per second signal that GPS exports.
As the further optimization of such scheme, described central processing unit is connected with digital to analog converter with GPS, Large Volume Data impact damper, temperature sensor, high-precision adc, short-distance wireless communication device, remote-wireless communicator, described digital to analog converter connects crystal oscillator, and described crystal oscillator is connected with central processing unit.
Further, it also comprises induction power-supply circuit, in order to power also to central processing unit and other devices from power induction power taking.
Further, described central processing unit adopts 32 low power processors.
Further, described temperature sensor adopts resistance temperature acquisition sensor.
Further, described analog to digital converter sampling rate is 50 cycles per second, and each cycle is sampled 256 sampling points.
Further, described temperature sensor detection conductor temperature scope is-40 ~ 125 DEG C.
Further, it also comprises out box screw rod, upper cover and lower cover, and described upper cover and lower cover are combined closely, described in open box screw rod and be located at lower cover bottom, and described in open top and the upper cover inner faces contact of box screw rod.
Device of the present utility model utilizes GPS (GPS) to realize the precise synchronization of each point sampled data, then by short distance and remote-wireless communication, by unified for the sampled data of each point Cloud Server sending backstage to, background server adopts transient state difference current algorithm, stable state homopolar power and manual decision's system to realize comprehensive fault line selection and fault locating.
Compared with prior art, the utility model at least has following characteristics:
(1) adopt the mode from the power taking of power induction electric current, to device self-powered, do not need external power supply and battery;
(2) not power restriction by single ended power supply, affect little by factors such as the fluctuation of load, harmonic wave, stake resistance and fault close angles;
(3) fault signature extracts and effectively make use of primary fault transient information and to client information, can effectively solve single-phase grounded malfunction in grounded system of low current route selection and orientation problem.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram of the utility model one embodiment.
Fig. 2 is the external structure schematic top plan view of the utility model one embodiment.
Fig. 3 is the external structure elevational schematic view of the utility model one embodiment.
Fig. 4 is the inner structure schematic diagram of the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the utility model is more specifically described.
As shown in Figure 1, be the schematic diagram being applied to power distribution network of the present embodiment.The device of the present embodiment is arranged on 35KV and each bus of following power distribution network and branch line, often 3 devices (the A phase of corresponding line of electric force, B phase, C phase) can be installed by place, the GPS in device (GPS) is utilized to realize the precise synchronization of each point apparatus internal sample data, then being concentrated by short-distance wireless communication device is aggregated on a main device, and main device is finally transmitted to backstage master station by the base station of remote-wireless communication (3G/4G) and the Internet again.Backstage master station adopts various fault decision algorithm and manual decision's system to realize faulty line selection and the location of fault.
Fig. 2 and Fig. 3 shows the external structure schematic diagram of the present embodiment.This device and line of electric force insulate completely, and no matter whether loaded current can both be mounted and dismounted by opening-closing structure line of electric force.The folding of device realizes by opening box screw rod 206, turns clockwise, and device upper cover 201, lower cover 204 two parts are separated, and snap in line of electric force, then are rotated counterclockwise, and upper and lower part closes.And press tongue 202 can compress line of electric force after device upper and lower covers is closed.Inside device upper cover 201, lower cover 204, built-in current mutual inductor is used for power taking and measurement.Electronic circuit in device is placed electrical installation box 203 li in the drawings, and have heat radiator 209 for heat radiation, LED 208 indicates on the spot for fault simultaneously, and built-in aerial 205 is then for communication.Sim card slot 207 is for installing the SIM card being used for remote-wireless communication (3G/4G) in addition.In addition, whole device is except buckle power line portion, and other parts have all done water-proofing treatment.
Fig. 4 is the present embodiment internal functional architecture schematic diagram.Wherein 300 is central processing unit (CPU).This processor adopts 32 low power processors, and the electric energy exported by induction power-supply circuit 301 is powered, and the clock accepting crystal oscillator 305 exports as work clock.Realize the real-time sampling to power line current by control high-precision adc 302, realize power line temperature collection by control temperature sensor.The data of sampling can stamp the time tag of unified GPS (GPS) 307, are then buffered in Large Volume Data impact damper 306.The data communication that short-distance wireless can be utilized to lead to line device 308 realize between neighboring devices, also can be realized by remote-wireless communicator 309 and far-end background system mutual, realize remote scheduling and monitoring.
301 is induction power-supply circuit.This circuit completes gets energy function from power induction, and power to central processing unit 300 and every other circuit, the self-powered of implement device, does not need external power supply and backup battery.
302 is high-precision adc.This analog to digital converter realizes the real-time sampling to power line current.
303 is temperature sensor.Temperature sensor adopts resistance temperature acquisition sensor, and this sensor can directly contact with line of electric force, and the temperature that its measurement obtains can convert voltage signal to, and central controller can complete sampling to voltage signal and storage, and is finally converted into temperature data.
304 is digital to analog converter.Digital to analog converter is used for that central processing unit is calculated the clock jitter obtained and is converted to analog voltage signal from digital signal, thus goes to control crystal oscillator, realizes the automatic frequency calibration of crystal oscillator.
305 is crystal oscillator.Crystal oscillator provides high-precision work clock to central processing unit, the pps pulse per second signal that this crystal oscillator can be exported by GPS carries out automatic frequency calibration (AFC), thus improve clock accuracy further, ensure the current sampling data precise synchronization of each infield, correctly reliable to ensure the analysis of fault.
306 is Large Volume Data impact damper.Adopt Large Volume Data impact damper, can provide the real-time data memory reaching a few hours, any moment breaks down, and all can trace back to the real time data of a few hours before fault.It significantly can reduce the requirement of real-time of device to fault data process on the one hand, also provides more decision-making foundation for fault analysis and location simultaneously.
307 is GPS (GPS).Central processing unit completes parsing and the management of the information such as initialization, timing information, geographic coordinate to GPS.Adopt GPS, precise time label can be stamped to sampled data, thus realize each infield electricity sampling, measure precise synchronization, ensured the correctness for the data of localization of fault and analysis and reliability.
308 is short-distance wireless communication device.Central processing unit completes initialization to short range communicator and communication scheduling.Short-distance wireless communication device can realize the intercommunication mutually between the device of the present embodiment being arranged on adjacent, simplification device cost and communication cost, realizes carrying out data acquisition, distribution and the communication with far-end backstage by main device is unified.
309 is remote-wireless communicator.Central processing unit completes initialization to telecommunication device and communication scheduling.By remote-wireless communicator, can data communication at a high speed between implement device and backstage, solve remote scheduling and remote monitoring problem.
Utilize above effector, the device of the present embodiment mainly achieves current monitoring, temperature monitoring, event record secondary failure positioning function.
(1) current monitoring
Power line current is monitored, and can measure the electric current flow through in electrical lead by current transformer or Luo-coil.Luo-coil can export the voltage signal corresponding with electric current by integrator, and current transformer also can connect sampling resistor to obtain the voltage signal corresponding with electric current at output terminal.In this embodiment, analog to digital converter is with 50 cycles per second, and the speed of each cycle 256 sampling points is sampled to electric current, and central processing unit is to each cycle data calculating current effective value (RMS) sampled and each harmonic component.Interference Detection and analysis can be carried out in real time on the one hand, also timing current flow effective value and each harmonic value can be reported backstage, realize remote monitoring.
(2) temperature monitoring
Power line temperature is monitored, and can be detected the temperature of electrical lead by resistance temperature acquisition sensor.In this embodiment, after device is installed line of electric force and be closed, the top of temperature detecting sensor can contact with electrical lead, and meanwhile, the housing of this sensor and device electrically and on heat energy is insulating completely.This temperature sensor can detect the conductor temperature of-40 degrees Celsius to+125 degrees Celsius, and produces the voltage output signal corresponding to conductor temperature for central processing unit (CPU) collection.
(3) event record ripple
When electric system generation disturbance, some cycle data before and after disturbance can be recorded, for recalling analysis afterwards by oscillograph.In this embodiment, if electric system generation disturbance, the present embodiment device can automatically be enrolled and preserve current waveform, device have employed the analog to digital converter of high resolving power (12.8KHz sample frequency) and high precision (16 bit data precision), adopt jumbo impact damper simultaneously, power line current data before can reviewing disturbance a few hours, also can record the disturbance event of tens thousand of times simultaneously.
(4) localization of fault
When line of electric force breaks down, there is the location algorithm much based on transient state or stable state.In this embodiment, if electric system generation disturbance, the device meeting automatic alarm of the present embodiment is to backstage.If judge it is that line current exceedes setting definite value simultaneously, device can automatic bright light be warned on the spot.First any disturbance all can be carried out the data of Selection and call relevant apparatus, then carry out fault line selection and fault locating according to various resultant fault route selection and location algorithm (comprising difference current algorithm etc.) after occurring by manual decision's system on backstage.
The present embodiment adopts and opens box structure, realizes the charged installation and removal without the need to having a power failure; Adopt the mode from the power taking of power induction electric current, to device self-powered; Adopt high-performance low-power-consumption processor, high-precision adc and software and hardware interference protection measure, ensure reliability and the accuracy of collection signal; Adopt GPS (GPS)/BEI-DOU position system precision time service, ensure that the synchronism of the sampled data of each device in universe; Utilize the pulse per second (PPS) information of positioning system, automatic frequency calibration (AFC) is carried out to system works clock jitter.
The present embodiment also proposed a kind of novel transient analysis method adopting difference current to calculate, the current information that this difference current algorithm utilizes the precise synchronization of neighboring devices to sample carries out difference operation, during normal operation, this difference is very little of zero, and exceed certain threshold value (thresholding can set according to actual conditions) once this difference and just can be judged to there occurs fault, thus complete fault line selection and fault locating; And it is a kind of based on the distribution of stable state homopolar power and the novel steady-state analysis method of manual decision's system, this steady-state analysis method utilizes transformer neutral point place, or the residual voltage that exports of threephase potential transformer open delta and three-phase installation precise synchronization are sampled the current information obtained, can the zero sequence power direction distribution plan of quasi real time guiding system each point on backstage, thus judge faulty spur, above-mentioned two kinds of methods overcome the deficiency of traditional route selection and location algorithm in the past
;after the device starting element triggering of this enforcement, start to store the Temporal Data before and after the triggered time and steady state data, carry out fault handling and differentiation.
The present embodiment utilizes adaptive threshold and continuous several times judgement mode, solves erroneous judgement and problem of failing to judge; When the present embodiment carries out failure wave-recording, by background system fault comprehensively analyzed and judge; This enforcement adopts the data buffer of Large Copacity (Giga-bit), reduces the requirement of real-time of synchrodata scheduling between each device, unified to background process; The present embodiment can telemonitoring line of electric force working condition by background system, comprises power line current, harmonic wave, temperature, for electric system to power monitoring circuit and optimization; The present embodiment passes through background system, the aerial online software upgrade of implement device.
Being more than preferred implementation of the present utility model, not departing from the improvement and distortion done under the prerequisite of the utility model know-why, also regarding as protection domain of the present utility model.
Claims (8)
1. an intelligent grid sensing device, is characterized in that, it comprises:
Central processing unit, for being realized the real-time sampling to power line current by control high-precision adc, realized power voltage line collection by control temperature sensor and be converted into temperature data, and to the parsing of the initialization of GPS device, timing information and geographic coordinate information and process, and to the initialization of short range communicator and telecommunication device and communication scheduling;
GPS, for loading precise time label to sampled data;
Large Volume Data impact damper, for the real time temperature of the store electricity line of force within the scope of setting-up time, electric current and voltage data;
Temperature sensor, this sensor directly contacts with line of electric force, for converting the temperature of the line of electric force recorded to voltage signal;
High-precision adc, for power line current real time data sampling;
Short-distance wireless communication device, for be arranged on adjacent intelligent grid sensing device between intercommunication mutually, then by main device to the intelligent grid sensing device of adjacent unified carry out data acquisition, distribution and and the communication on far-end backstage;
Remote-wireless communicator, for the data communication between intelligent grid sensing device and backstage;
Digital to analog converter, for being converted to analog voltage signal by the clock jitter that central processing unit calculates from digital signal; And
Crystal oscillator, for providing high-precision work clock to central processing unit, carries out automatic frequency calibration according to the pps pulse per second signal that GPS exports.
2. intelligent grid sensing device according to claim 1, it is characterized in that, described central processing unit is connected with digital to analog converter with GPS, Large Volume Data impact damper, temperature sensor, high-precision adc, short-distance wireless communication device, remote-wireless communicator, described digital to analog converter connects crystal oscillator, and described crystal oscillator is connected with central processing unit.
3. intelligent grid sensing device according to claim 1, is characterized in that it also comprises induction power-supply circuit, in order to power also to central processing unit and other devices from power induction power taking.
4. intelligent grid sensing device according to claim 1, is characterized in that, described central processing unit adopts 32 low power processors.
5. intelligent grid sensing device according to claim 1, is characterized in that, described temperature sensor adopts resistance temperature acquisition sensor.
6. according to the arbitrary described intelligent grid sensing device of claim 1 ~ 5, it is characterized in that, described analog to digital converter sampling rate is 50 cycles per second, and each cycle is sampled 256 sampling points.
7. according to the arbitrary described intelligent grid sensing device of claim 1 ~ 5, it is characterized in that, described temperature sensor detection conductor temperature scope is-40 ~ 125 DEG C.
8. according to the arbitrary described intelligent grid sensing device of claim 1 ~ 5, it is characterized in that it also comprises out box screw rod, upper cover and lower cover, described upper cover and lower cover are combined closely, described in open box screw rod and be located at lower cover bottom, and described in open top and the upper cover inner faces contact of box screw rod.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748870A (en) * | 2015-04-02 | 2015-07-01 | 杨志强 | Passive wireless temperature current sensor |
| CN105676060A (en) * | 2014-11-18 | 2016-06-15 | 苏州银蕨电力科技有限公司 | Smart grid sensing device |
| CN105954562A (en) * | 2016-05-06 | 2016-09-21 | 苏州银蕨电力科技有限公司 | High voltageextra-high voltage converter station DC change-over switch lightning arrester action current measuring device, method and application |
| CN107037322A (en) * | 2017-04-14 | 2017-08-11 | 积成电子股份有限公司 | Power distribution network low current grounding localization method based on steady state characteristic |
| CN107703342A (en) * | 2017-08-23 | 2018-02-16 | 安徽北斗易通信息技术有限公司 | A kind of high-precision transient analyser and its transient arithmetic |
| CN109407633A (en) * | 2018-10-23 | 2019-03-01 | 江门市众鑫表面处理有限公司 | A kind of electric power monitoring system |
| CN111698712A (en) * | 2020-06-16 | 2020-09-22 | 广西大学 | Novel fault indicator based on 5G |
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2014
- 2014-11-18 CN CN201420693335.1U patent/CN204177910U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676060A (en) * | 2014-11-18 | 2016-06-15 | 苏州银蕨电力科技有限公司 | Smart grid sensing device |
| CN104748870A (en) * | 2015-04-02 | 2015-07-01 | 杨志强 | Passive wireless temperature current sensor |
| CN105954562A (en) * | 2016-05-06 | 2016-09-21 | 苏州银蕨电力科技有限公司 | High voltageextra-high voltage converter station DC change-over switch lightning arrester action current measuring device, method and application |
| CN107037322A (en) * | 2017-04-14 | 2017-08-11 | 积成电子股份有限公司 | Power distribution network low current grounding localization method based on steady state characteristic |
| CN107037322B (en) * | 2017-04-14 | 2019-12-17 | 积成电子股份有限公司 | power distribution network low-current grounding fault positioning method based on steady-state characteristics |
| CN107703342A (en) * | 2017-08-23 | 2018-02-16 | 安徽北斗易通信息技术有限公司 | A kind of high-precision transient analyser and its transient arithmetic |
| CN109407633A (en) * | 2018-10-23 | 2019-03-01 | 江门市众鑫表面处理有限公司 | A kind of electric power monitoring system |
| CN111698712A (en) * | 2020-06-16 | 2020-09-22 | 广西大学 | Novel fault indicator based on 5G |
| CN111698712B (en) * | 2020-06-16 | 2023-05-09 | 广西大学 | Novel fault indicator based on 5G |
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