CN205539179U - Built on stilts distribution lines zero sequence current acquisition terminal based on clock synchronization technique - Google Patents
Built on stilts distribution lines zero sequence current acquisition terminal based on clock synchronization technique Download PDFInfo
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Abstract
The utility model discloses a built on stilts distribution lines zero sequence current acquisition terminal based on clock synchronization technique, including the current sample terminal, be provided with in the current sample terminal get can the circuit, measuring circuit, MCU treater and indicator wireless communication module, the MCU treater respectively with get can the circuit, measuring circuit and indicator wireless communication module be connected, get be provided with in can the circuit get can CT and the electric energy obtain the module, the MCU treater is connected the electric energy and is obtained the module, the electric energy obtains the module to be connected and gets can CT, and gets the phase line of can CT connecting built on stilts distribution lines, the electric energy is provided with rectifier module, overvoltage protection module, voltage processing module, energy storage module, boost module in acquireing the module, the step -down converter steps up, zero sequence current high -speed sampling for can low -costly accomplishing overhead line (built on stilts distribution lines ) provides hardware platform, further provides the most accurate earth current signal for distribution network automation system.
Description
Technical field
This utility model relates to Power System Intelligent technical field, specifically, is overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology.
Background technology
For cost reasons and the reason of maintenance workload, the distribution network of most countries all uses small current neutral grounding system in the world.That is: the transformer neutral point of Central Substations is earth-free or passes through grounding through arc.When there is circuit single-phase earthing when, earth current is the least, and the equipment that do not results in damages owing to big electric current flows through；The when of generation single-phase earthing, distribution still can adhere to work 2 ~ 24 hours in spite of illness.
During single-phase earthing, owing to fault current is little so that failure line selection is more difficult, conventional electric substation is to send signal by insulation monitor, informs operations staff, is then carried out failure judgement point by operations staff by being connected on the value of table in voltage transformer secondary phase voltage.Owing to insulation monitor can only judge that a certain electric pressure system has no ground, and not can designate that the circuit at place, trouble point, so in order to find out trouble point, each bar line switching must be disconnected the most in short-term, confirmation is to restore electricity after non-fault line again, so, the reliability of power supply will be had a strong impact on.Distribution at present tries to draw in order, important load post-tensioning, and unessential load first draws, the most sometimes the time of Failure elimination is the most long, in this process, the consequence such as arc grounding over-voltage or short circuit may be caused, affect the safety in production of whole device.
Along with the fast development in city, the overhead transmission line of the distribution line in big or middle city is progressively replaced by cable run, and cable butting earth-current is to be very easy to sampling.Because:
3I0=IA+IB+IC；
As long as threephase cable can be obtained zero-sequence current also cross a ZCT, ZCT secondary side, as long as judging that zero sequence circuit size can judge singlephase earth fault.
China's major part urban distribution network also has the built on stilts distribution line of 30% ~ 40% at present, county town and rural power grids 80% ~ 100% are overhead transmission lines, overhead transmission line does not has insulant to be filled in the middle of the three-phase conductor of circuit, so all having insulation distance requirement, the least 11cm between every phase conductor and between wire and the earth.So overhead transmission line just cannot obtain zero-sequence current by ZCT, and this also results in overhead transmission line distribution automation and is difficult to accurately judge earth fault.
The most domestic mode also having part producer to install ZCT on overhead transmission line chopper additional is to gather zero-sequence current, and such method is similar with wireline test zero-sequence current.
Owing to aerial line does not has insulant protection to be difficult to obtain zero-sequence current by the way of three-phase current is added; the earth fault sampling causing distribution cannot accurately obtain; when there is earth fault when, only examine fault zone by artificial drawing switch, the most time-consuming affect again power supply reliability.
By the way of aerial line on-pole switch (chopper) installs ZCT additional, although can accurately obtain zero-sequence current, but owing to cost is high, installation difficulty, it is impossible to spread, still cannot effectively solve zero-sequence current problem of sampling.
Distribution network overhead line limits due to factors such as insulation distance, mounting means, costs, it is impossible to accurately obtain the zero-sequence current in circuit, cannot position by fast failure when of causing generation single-phase earthing.
Utility model content
The purpose of this utility model is to design overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology, for low cost the zero-sequence current high-speed sampling of overhead transmission line (overhead distribution) can be completed provide hardware platform, provide earth current signal the most accurately for distribution automation system further.
This utility model is achieved through the following technical solutions: overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology, including current sample terminal, be provided with in described current sample terminal take can circuit, measuring circuit, MCU processor and indicator wireless communication module, described MCU processor can circuit, measuring circuit and indicator wireless communication module be connected with taking respectively.
Further for preferably realizing this utility model, use especially following set-up mode: described in take and can be provided with that take can CT and electric energy acquisition module in circuit, described MCU processor connects electric energy acquisition module, the connection of described electric energy acquisition module takes energy CT, and takes the phase line of energy CT link overhand lines.
Further for preferably realizing this utility model, use following set-up mode especially: in described electric energy acquisition module, be provided with rectification filtering module, overvoltage protective module, voltage processing module, energy-storage module, boost module, voltage raising and reducing transducer, described taking can connect rectification filtering module by CT, described rectification filtering module connects overvoltage protective module, described overvoltage protective module connects voltage processing module, described voltage processing module connects energy-storage module, described energy-storage module connects boost module and voltage raising and reducing transducer respectively, described boost module is all connected with measuring circuit with voltage raising and reducing transducer, described voltage raising and reducing transducer is connected with MCU processor and indicator wireless communication module the most respectively.
Further for preferably realizing this utility model, use following set-up mode especially: in measuring circuit, be provided with measurement CT and A/D change-over circuit, described MCU processor connects A/D change-over circuit, and described A/D change-over circuit is connected with boost module and voltage raising and reducing transducer respectively；Described A/D change-over circuit connects measures CT, and measures the phase line of CT link overhand lines.
Further for preferably realizing this utility model, use following set-up mode especially: in described A/D change-over circuit, be provided with sampling comparison circuit, conventional current detection amplification module, checking of great current amplification module, described measurement CT connects sampling comparison circuit, described sampling comparison circuit connects conventional current detection amplification module respectively, checking of great current amplification module, described conventional current detection amplification module, checking of great current amplification module is all connected with MCU processor, the outfan of described voltage raising and reducing transducer is connected with sampling comparison circuit, the outfan of described boost module detects amplification module with conventional current respectively, checking of great current amplification module is connected.
Further for preferably realizing this utility model, use following set-up mode especially: also include voltage transformer and data sink, described voltage transformer is connected with data sink, and described indicator wireless communication module is connected with data sink by wireless signal.
Further for preferably realizing this utility model, use following set-up mode especially: be provided with flush bonding processor, GPRS module, GPS module, memory circuitry in described data sink and gather ZigBee module, described flush bonding processor is connected with GPRS module, the voltage sample front-end processing circuit of voltage transformer, memory circuitry, GPS module and collection ZigBee module respectively, described collection ZigBee module is connected with current sample terminal by wireless signal, and the input of described voltage sample front-end processing circuit is connected with phase line.
Further for preferably realizing this utility model, use following set-up mode especially: in described data sink, be additionally provided with peripheral circuit, in described peripheral circuit, be provided with communication interface circuit, JTAG download mouth, display lamp, key-press module, watchdog circuit and the debugging interface being connected with flush bonding processor respectively.
Further for preferably realizing this utility model, use following set-up mode especially: described current sample terminal is 3, and all phase lines with 3 phase overhead distributions are connected.
This utility model compared with prior art, has the following advantages and beneficial effect:
(1) this utility model low cost can complete the zero-sequence current high-speed sampling of overhead transmission line (overhead distribution), earth current signal the most accurately is provided so that can fast failure location when of small current neutral grounding system generation single-phase earthing for distribution automation system.
(2) current sample terminal described in the utility model need not additional energy source and powers, and has easy for installation, the feature that signal is reliable and stable.
(3) Clock Synchronization Technology of this utility model application low cost carries out the clock synchronization of current sample terminal and data sink；And in full distribution line, the clock of all of data sink synchronizes；Indicator wireless communication module and collection ZigBee module is utilized to complete the clock synchronizing function of data sink and current sample terminal.
(4) this utility model utilizes voltage transformer to obtain energy, will pass through data sink to complete the vector calculus of three-phase current, with three-phase current vector value as initial data, for calculating zero-sequence current waveform, zero-sequence current dutycycle, zero-sequence current unit interval rate of change equivalence offer hardware platform by algorithm.
(5) this utility model uses ZiGbee communication mode to complete data sink and the data interaction of line-failure indicator (current sample terminal) and communication.
(6) this utility model can be with the collection overhead transmission line zero sequence circuit of low cost.
(7) this utility model can be realized with a low cost the zero-sequence current sampling of aerial line, and its cost is that pole-mounted circuit breaker gathers the 20% of zero-sequence current cost so that rural area distribution automation is possibly realized, and has great economy meaning and promotional value.
(8) this utility model can improve zero sequence current measurement precision, zero-sequence current it is calculated by primary current after being sampled, can realize the sampling of faint zero-sequence current, the minimum zero sequence according to testing acquisition terminal collection described in the utility model can reach 30mA.
(9) this utility model is according to 64-1024 high-speed sampling of each cycle, and carry out data process and preservation, can easily realize the collection of zero-sequence current transient-wave, record work, related data is all in the middle of data sink, if daemon software needs transient analysis, just can call survey zero sequence transient-wave in real time together to daemon software, daemon software is according to clock data, and current value etc. accurately analyzes the region that earth fault occurs.
(10) data sink described in the utility model has been the three-phase current collection of distribution, the collection of zero sequence circuit, the collection of phase voltage and short circuit, the analysis of over current fault, judgement, and then the real-time status collecting work completing distribution network overhead line provides hardware platform, if daemon software needs data, can be called together by GPRS or communication serial ports and survey to side, backstage, carry out senior applied analysis.
Accompanying drawing explanation
Fig. 1 is positive sequence, negative phase-sequence, zero sequence vector diagram.
Fig. 2 is overhead distribution zero-sequence current acquisition terminal structure chart described in the utility model.
Fig. 3 is current sample terminal logic Organization Chart described in the utility model.
Fig. 4 is electric energy acquisition modular circuit theory diagram described in the utility model.
Fig. 5 is A/D change-over circuit theory diagram described in the utility model.
Fig. 6 is data sink logical architecture figure described in the utility model.
Fig. 7 is checking of great current amplification module practical circuit diagram described in the utility model.
Wherein, 1-A phase current sampling terminal, 2-B phase current sampling terminal, 3-C phase current sampling terminal, 4-voltage transformer, 5-current sample terminal.
Detailed description of the invention
Below in conjunction with embodiment, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Overhead transmission line zero-sequence current to be obtained still can obtain in the way of using three-phase current vector, needs the sensor on three-phase conducting wire to be acquired according to the unified time, and value and the acquisition time of collection is sent on data sink in real time.Three-phase current is carried out vector calculus according to same acquisition time by data sink, can obtain zero-sequence current value.
Zero-sequence current is one and calculates concept, mathematical theory based on phasor analysis.Symmetrical component method is the common method analyzing unbalanced fault, according to symmetrical component method, in three-phase circuit, any one group of asymmetric three-phase phasor (such as electric current) can be broken into positive sequence, negative phase-sequence, three groups of phasors (as shown in Figure 1) of zero sequence: in figure, and (a) is one group of 3 symmetrical positive-sequence component (components i.e. decompose after phasor)；B () is one group of 3 symmetrical negative sequence component；C () is one group 3 zero-sequence components equal in magnitude, that phase place is identical.So-called positive-sequence component refers to that the phase sequence of 3 phasors meets the component of right-handed coordinate system rule order；So-called negative sequence component refers to that the phase sequence of 3 phasors meets the component of left-handed coordinate system order；So-called zero-sequence component is that the phase angle of 3 phasors is identical, there is not the phasor of phase place rotational order relation.Phasor is as the important means of research physical phenomenon, and its operational rule has done considerable correction and identification according to physical phenomenon rule, and phasor operational rule is also known as phasor computing rule, and phasor operational rule is all the artificial rule established.
In FIG, I is arbitrary one group of three-phase current phasor in isoplanar, and the meansigma methods of the sum of three phasors is: (+)/3, by Ia/3, Ib/3, Ic/3 phasor, rotate to obtain three groups of symmetry phasors by 120 ° respectively:
(a1+a0+a2)/3=0；
(b1+b0+b2)/3=0；
(c1+c0+c2)/3=0；
By (a1+a0+a2)/3, (b1+b0+b2)/3, (c1+c0+c2)/3 phasor, rotate to obtain three groups of symmetry phasors by-120 ° respectively.
If get three-phase current according to vector calculus rule, the time of three-phase current collection can be by zero-sequence current computed below.
I0=Ia+Ib*(cos (120+ φ)+jsin (120+ φ)))+Ic*(cos (240+ φ)+jsin (240+ φ)).
Embodiment 1:
The utility model proposes overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology, shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, including the current sample terminal being arranged on three-phase line, the voltage transformer 4 being connected on three-phase line and data sink 5, described voltage transformer 4 is connected with data sink 5, and described current sample terminal is connected with data sink 5 by wireless signal；Described data sink 5 is connected with backstage by communication network.
Described current sample terminal includes that A phase current sampling terminal 1,3,3 current sample terminals of B phase current sampling terminal 2 and C phase current sampling terminal all possess two set current sampling circuits, a set of measurement sampling during normal current；Another set of sampling for big current data, the big electric current mainly preventing transcient short circuit time from occurring burns measures loop normally.When actual design is applied, on current sample terminal secondary side, string has the resistance of one 1 ohm, the voltage measured when big electric current occurs when in resistance value raises, driving field effect transistor turns on, and simultaneously by multiplication of voltage DC circuit, booster tension guarantees amplifier chip reliably working, now two amplifier chips amplify upper half-wave and lower half-wave respectively, during normal current, ohmically undertension is to drive field effect transistor, and electric current walks common discharge circuit, and big electric current amplifier loop of getting along well is consistent.
Described current sample terminal receives the clock sync signal that data sink 5 sends, according to the clock of this clock data point reuse itself；Current value in timing acquiring circuit；Timing and data sink 5 carry out communication and the current value of collection and collection timing synchronization are sent to data sink 5.
Described data sink 5, receives the clock signal that GPS module provides；Carry out communication by gathering Zigbee module and current sample terminal (current sensor), clock signal is sent to current sample terminal (current sensor)；Current value and the collection moment that current sample terminal (current sensor) gathers is received by gathering Zigbee module；Utilize flush bonding processor (dsp chip), calculate zero-sequence current waveform in conjunction with vector method, and be stored in the machine；And breakdown judge can be carried out according to the setting value of daemon software, if being short-circuited, the breakdown judge such as ground connection, if breaking down, actively transmitting data to backstage；Carrying out communication by GPRS module and backstage main station system, if survey data are called on backstage together, the data syn-chronization after gathering data and calculate is sent to daemon software, carries out advanced analysis and application；Utilize voltage transformer 4(PT) secondary coil provide voltage carry out power management and deposit；Complete the energy management of accumulator, accomplish battery do not overcharge, charge less, timing deep charge and discharge, overload protection；The voltage of monitoring PT, according to daemon software needs, is sent to backstage by Monitoring Data.
Embodiment 2:
The present embodiment is to optimize further on the basis of above-described embodiment, further for preferably realizing this utility model, in conjunction with Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Fig. 7, use following set-up mode especially: be provided with in described current sample terminal and take energy CT, electric energy acquisition module, MCU processor, measure CT, A/D change-over circuit, indicator wireless communication module, described MCU processor respectively with electric energy acquisition module, A/D change-over circuit and indicator wireless communication module are connected, described taking can connect electric energy acquisition module by CT, described measurement CT connects A/D change-over circuit；It is provided with rectification filtering module in described electric energy acquisition module, overvoltage protective module, voltage processing module, energy-storage module, boost module, voltage raising and reducing transducer, described taking can connect rectification filtering module by CT, described rectification filtering module connects overvoltage protective module, described overvoltage protective module connects voltage processing module, described voltage processing module connects energy-storage module, described energy-storage module connects boost module and voltage raising and reducing transducer respectively, described boost module connects A/D change-over circuit, described voltage raising and reducing transducer respectively with MCU processor, A/D change-over circuit and indicator wireless communication module are connected.
nullDescribed taking can be connected in phase line carry out taking energy by CT，And utilize CT1_1 and the CT1_2 foot taken on energy CT to carry out rectification and filtering operation in being linked into rectification filtering module，Then yield less than the DC voltage of 43V by overvoltage protective module and transmit to voltage processing module, carry out voltage process，The preferably chip U2 in voltage processing module uses LM2576 chip，Described voltage processing module carries out accumulation of energy in output 5.4V DC voltage to energy storage module，Energy storage module accumulation of energy output DC2.7 ~ 5.4V is respectively in boost module and voltage raising and reducing transducer，In boost module through boosting after export DC6.6V，And will be through boosting or blood pressure lowering in voltage raising and reducing transducer，Finally export DC3.3V，DC6.6V will access A/D change-over circuit，And DC3.3V will access MCU processor、A/D change-over circuit and indicator wireless communication module.
Embodiment 3:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this utility model, in conjunction with Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Fig. 7, use following set-up mode especially: in described A/D change-over circuit, be provided with sampling comparison circuit, conventional current detection amplification module, checking of great current amplification module, described measurement CT connects sampling comparison circuit, described sampling comparison circuit connects conventional current detection amplification module respectively, checking of great current amplification module, described conventional current detection amplification module, checking of great current amplification module is all connected with MCU processor, the outfan of described voltage raising and reducing transducer is connected with sampling comparison circuit, the outfan of described boost module detects amplification module with conventional current respectively, checking of great current amplification module is connected.
Described checking of great current amplification module Main Function is circuit is short-circuited fault when; it is operated by checking of great current module; simultaneously for protection circuit safety, the big electric current in sample circuit is carried out earial drainage, it is ensured that circuit below will not burn because of the generation of big electric current.
After electric current is inputted by L1, L2, through sampling resistor R9, a voltage can be produced on sampling resistor R9, the when that electric current being little, the voltage on sampling resistor R9 is the least, and Q2 is not turned on, R6 lower end is high level, now the I/O mouth detection of MCU processor (CPU), is defined as normal current, and MCU processor (CPU) gathers the voltage of conventional current detection amplification module.
If being short-circuited after fault, sampling resistor R9 voltage raises rapidly, causes Q2 to turn on, and the lower end of R6 becomes low level, and MCU processor (CPU) detects that big electric current produces.MCU processor (CPU) now selects the voltage of checking of great current amplification module.In order to protect subsequent conditioning circuit when that big electric current producing, now should earial drainage.R2 is usual, and voltage is relatively low, and when big electric current occurs when, R2 voltage is sufficiently high to trigger the conducting of CMOS tube Q1, and after conducting, the short circuit of big results of weak current CMOS tube Q1, will not work the mischief to circuit below.
General current sample and short circuit sample circuit are separated by this utility model current sample terminal (current sensor).General current sampling circuit core is that the precision measured wants height, it is to avoid measurement error brings inevitable error to accident analysis computing below.And short circuit sample circuit not only to complete to measure function, also to avoid the damage to sensor of the big electric current.As shown in Figure 7, resistance R9 is the sampling of big electric current when short trouble, after big electric current occurs, the voltage on R9 raises and promotes Q1 to turn on, electronegative potential on the downside of R1 resistance, trigger MCU processor (MCU processor) to interrupt, the voltage of R9 also promotes Q2 to turn on simultaneously, by big electric current earial drainage, it is to avoid other component wear of circuit.
Embodiment 4:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this utility model, in conjunction with Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Fig. 7, use following set-up mode especially: in described data sink 5, be provided with flush bonding processor, GPRS module, GPS module, memory circuitry and collection ZigBee module, described flush bonding processor respectively with GPRS module, the voltage sample front-end processing circuit of voltage transformer 4, memory circuitry, GPS module and collection ZigBee module are connected, described collection ZigBee module is connected with current sample terminal by wireless signal, the input of described voltage sample front-end processing circuit is connected with phase line.
Embodiment 5:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this utility model, shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, use following set-up mode especially: in described data sink 5, be additionally provided with peripheral circuit, in described peripheral circuit, be provided with communication interface circuit, JTAG download mouth, display lamp, key-press module, watchdog circuit and the debugging interface being connected with flush bonding processor respectively.
Its operation principle and acting as:
1-1) data sink 5 is powered by voltage transformer, starts work；
1-2) data sink 5 starts GPS module, obtains clock signal, and the block pattern of clock signal is: XXXXXXXX:XXXXXXXX, and precision is microsecond；
1-3) start collection ZigBee module, send handshake, wait the information that current sample terminal internal indicator wireless communication module is replied；
1-4) configuration current sample terminal, will take and can carry out taking energy parameter configuration by CT, and measure CT and measure parameter configuration；One magnetic core coil of current sample terminal is used for taking and can be powered for current sample terminal, and another one magnetic core coil is for measuring the electric current of phase line；
1-5) take and electric energy acquisition module can be coordinated to form 3.3V and 6.6V running voltage by CT, being respectively sampling comparison circuit provides 3.3V benchmark to compare voltage, MCU processor and indicator wireless communication module provide 3.3V running voltage, conventional current detection amplification module and checking of great current amplification module to provide 6.6V running voltage；
1-6) MCU processor startup indicator wireless communication module realizes shaking hands with collection ZigBee module communication；
1-7) data sink 5 receives the information that current sample terminal internal indicator wireless communication module is replied, and confirms communication successful connection；
1-8) data sink 5 tranmitting data register data are to current sample terminal internal indicator wireless communication module；
After 1-9) current sample terminal check communication channel is normal, receive the clock data that data sink 5 transmits；
1-10) through step 1-9) after, current sample terminal, according to this clock data, adjusts self clock, it is ensured that consistent with the clock of GPS module；
1-11) measure CT and carry out line current sampling, and carry out data compression and storage；
1-12) every 4 cycles, current sample terminal sends collection data by indicator wireless communication module to data sink 5；Described collection data acquisition two-dimensional format, containing line electricity flow valuve and collection moment；The cycle of described cycle is 80ms；
1-13) wait, every 4 cycle data sinks 5, the collection data that current sample terminal sends；The cycle of described cycle is 80ms；
After 1-14) data sink 5 gets the current data that current sample terminal is gathered, the value that is averaged calculates, and is then analyzed with short circuit, stream setting value excessively, carries out quick-break value or overcurrent value judges, it is determined whether stream and short trouble occurred；
1-15) through step 1-14) after, if having short circuit or over current fault, data sink 5 sends fault message by GPRS or serial ports；When there is short circuit or over current fault, data sink 5 starts light warning and sends fault message by GPRS or serial ports to back-stage management platform, and its fault message includes that fault type, fault occur the moment；
1-16) through step 1-14) after, if not being short-circuited or over current fault, data sink (5) judges whether successfully receiving the current data that three current sample terminals are transmitted, if being all properly received, carrying out data filtering and relevant mathematical operation by flush bonding processor, described relevant mathematical operation includes that zero-sequence current synthesis, zero-sequence current phase calculation, zero-sequence current rate of change, zero-sequence current amplitude judge computing；
1-17) through step 1-16) after, if zero-sequence current amplitude exceedes setting value or zero-sequence current rate of change exceedes setting value, data sink 5 sends fault message by GPRS or serial ports；When occurring that zero-sequence current amplitude exceedes setting value or zero-sequence current rate of change exceedes setting value, start earth fault light prompt, and fault message can be sent by GPRS or serial ports to back-stage management platform；Described fault message includes that fault type, fault occur the moment；
1-18) receive after data sink 5 actively calls survey order together when current sample terminal, acquisition interval is adjusted to 64 collection points of each cycle, and carries out data transmission.
Circuit, when being short-circuited or after over current fault, uses special circuit to avoid measuring wafer damage, increases high current current by pass (discharge portion in Fig. 7) the most in circuit.
The above; it it is only preferred embodiment of the present utility model; not this utility model is done any pro forma restriction, every according to technical spirit of the present utility model, above example is made any simple modification, equivalent variations, within each falling within protection domain of the present utility model.
Claims (9)
1. overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology, it is characterized in that: include current sample terminal, be provided with in described current sample terminal take can circuit, measuring circuit, MCU processor and indicator wireless communication module, described MCU processor can circuit, measuring circuit and indicator wireless communication module be connected with taking respectively.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 1, it is characterized in that: described in take and can be provided with that take can CT and electric energy acquisition module in circuit, described MCU processor connects electric energy acquisition module, the connection of described electric energy acquisition module takes energy CT, and takes the phase line of energy CT link overhand lines.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 2, it is characterized in that: in described electric energy acquisition module, be provided with rectification filtering module, overvoltage protective module, voltage processing module, energy-storage module, boost module, voltage raising and reducing transducer, described taking can connect rectification filtering module by CT, described rectification filtering module connects overvoltage protective module, described overvoltage protective module connects voltage processing module, described voltage processing module connects energy-storage module, described energy-storage module connects boost module and voltage raising and reducing transducer respectively, described boost module is all connected with measuring circuit with voltage raising and reducing transducer, described voltage raising and reducing transducer is connected with MCU processor and indicator wireless communication module the most respectively.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 3, it is characterized in that: in measuring circuit, be provided with measurement CT and A/D change-over circuit, described MCU processor connects A/D change-over circuit, and described A/D change-over circuit is connected with boost module and voltage raising and reducing transducer respectively；Described A/D change-over circuit connects measures CT, and measures the phase line of CT link overhand lines.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 4, it is characterized in that: in described A/D change-over circuit, be provided with sampling comparison circuit, conventional current detection amplification module, checking of great current amplification module, described measurement CT connects sampling comparison circuit, described sampling comparison circuit connects conventional current detection amplification module respectively, checking of great current amplification module, described conventional current detection amplification module, checking of great current amplification module is all connected with MCU processor, the outfan of described voltage raising and reducing transducer is connected with sampling comparison circuit, the outfan of described boost module detects amplification module with conventional current respectively, checking of great current amplification module is connected.
6. according to the overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology described in any one of claim 1-5, it is characterized in that: also include voltage transformer (4) and data sink (5), described voltage transformer (4) is connected with data sink (5), and described indicator wireless communication module is connected with data sink (5) by wireless signal.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 6, it is characterized in that: described data sink is provided with flush bonding processor in (5), GPRS module, GPS module, memory circuitry and collection ZigBee module, described flush bonding processor respectively with GPRS module, the voltage sample front-end processing circuit of voltage transformer (4), memory circuitry, GPS module and collection ZigBee module are connected, described collection ZigBee module is connected with current sample terminal by wireless signal, the input of described voltage sample front-end processing circuit is connected with phase line.
Overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology the most according to claim 7, it is characterized in that: in described data sink (5), be additionally provided with peripheral circuit, in described peripheral circuit, be provided with communication interface circuit, JTAG download mouth, display lamp, key-press module, watchdog circuit and the debugging interface being connected with flush bonding processor respectively.
9. according to the overhead distribution zero-sequence current acquisition terminal based on Clock Synchronization Technology described in claim 1-5,7,8 any one, it is characterised in that: described current sample terminal is 3, and all phase lines with 3 phase overhead distributions are connected.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677933A (en) * | 2017-11-21 | 2018-02-09 | 桂林师范高等专科学校 | Detecting fault line for un-ground neutral power system |
| CN111579926A (en) * | 2020-05-22 | 2020-08-25 | 东北电力大学 | Distributed power fault positioning method for power distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677933A (en) * | 2017-11-21 | 2018-02-09 | 桂林师范高等专科学校 | Detecting fault line for un-ground neutral power system |
| CN111579926A (en) * | 2020-05-22 | 2020-08-25 | 东北电力大学 | Distributed power fault positioning method for power distribution network |
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