CN205404670U - Transmission line transient state current collection device - Google Patents
Transmission line transient state current collection device Download PDFInfo
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- CN205404670U CN205404670U CN201620127388.6U CN201620127388U CN205404670U CN 205404670 U CN205404670 U CN 205404670U CN 201620127388 U CN201620127388 U CN 201620127388U CN 205404670 U CN205404670 U CN 205404670U
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Abstract
The utility model discloses a transmission line transient state current collection device, include: the electric current sensing module, the electric current sensing module is including the transient current of gathering transmission line to output corresponds the flexible luo shi coil of differential signal, and with the active integrating circuit of differential signal reduction for the travelling wave analog signal of transient current, be connected with the electric current sensing module, carry out analog -to -digital conversion with travelling wave analog signal, the travelling wave data signal's that obtains after the storage conversion collection module, be connected with electric current sensing module and collection module, when detecting travelling wave analog signal above predetermined travelling wave threshold value, send a triggering signal and trigger the travelling wave trigger module that collection module stops analog -to -digital conversion and storage, be connected with travelling wave trigger module and collection module, read and save the controller of travelling wave data signal to preset the memory in when detecting a triggering signal. The utility model discloses the travelling wave signal of transient current can be restoreed effectively, the accurate positioning to the transmission line trouble is guaranteed.
Description
Technical field
This utility model relates to electric power monitoring field, particularly relates to a kind of transmission line of electricity transient current harvester.
Background technology
Along with the development of science and technology, electric power plays vital role in the work and life of people.Transmission line of electricity breaks down and can cause great inconvenience to people, and therefore, finding trouble point after transmission line of electricity breaks down in time is the most important thing.
Under normal circumstances, after transmission line of electricity breaks down, scheduling relies primarily on fault location data and carrys out lower line walking extent directive of determining, but existing fault locator error is bigger so that the line walking scope that scheduling is assigned is bigger.No matter it is overhead transmission line or cable run, major part fault vestige of significantly not burning, bring very big difficulty to the investigation of trouble point, occupy more than half that faulty equipment is keeped in repair total time particularly in time of night, mountain area and trouble-shooting in winter point.But, need after line failure quickly and accurately trouble point to be positioned, fixing a breakdown in time restores electricity, thus ensureing the power supply reliability of whole system.At present, usually adopting traveling wave method fault distance-finding method that transmission line malfunction is positioned, its positioning precision and reliability are heavily dependent on sampling precision and the reliability of transient current travelling waves signal pickup assembly.But when adopting current traveling wave method to carry out fault localization, owing to traditional current transformer measures broadband not and decay, it is impossible to effectively reduce the travelling wave signal of transient current and its problem that there is magnetic saturation heavyweight vehicle, therefore, the accuracy to localization of fault is had a strong impact on.
Utility model content
The purpose of this utility model is to provide a kind of transmission line of electricity transient current harvester, it is possible to be effectively improved sampling precision and reliability, and can effectively reduce the travelling wave signal of transient current, thereby may be ensured that and transmission line malfunction is accurately positioned.
Utility model provides following technical scheme:
A kind of transmission line of electricity transient current harvester, including:
Current sense module, described current sense module includes the transient current gathering transmission line of electricity, and exports the flexible Luo-coil of the differential signal of described transient current, and described differential signal is reduced to the active integrating circuit of the traveling wave analogue signal of transient current；
It is connected with described current sense module, described traveling wave analogue signal is carried out analog digital conversion, and the acquisition module of the traveling wave digital signal obtained after storing conversion；
It is connected with described current sense module and described acquisition module, detect whether described traveling wave analogue signal exceedes default traveling wave threshold value, and when exceeding described traveling wave threshold value, send the first triggering signal described acquisition module of triggering and stop described traveling wave analogue signal is carried out the traveling wave trigger module of analog digital conversion and storage；
It is connected with described traveling wave trigger module and described acquisition module, reads described traveling wave digital signal when described first triggering signal being detected, and described traveling wave digital signal is stored the controller to default memorizer.
Preferably, also include:
Detecting and export the power frequency sensing module of the power frequency analogue signal of described transmission line of electricity, described power frequency sensing module is connected with described controller, sets described traveling wave threshold value for described controller according to described power frequency analogue signal.
Preferably, also include:
The traveling wave analogue signal that described current sense module is exported carries out the traveling wave modulate circuit of signal amplitude adjustment, filtering and level lifting；
The power frequency analogue signal that described power frequency sensing module is exported carries out the power frequency modulate circuit of signal amplitude adjustment, filtering and level lifting.
Preferably, described acquisition module includes:
The traveling wave analogue signal that described current sense module is exported carries out the converter of analog digital conversion；
It is connected with described converter, stores the acquisition memory of the traveling wave digital signal of described converter output；
It is connected with described traveling wave trigger module, when receiving described first and triggering signal, controls described converter and stop AD conversion and output, and control the acquisition controller of the stopping reception of described acquisition memory and storage line ripple digital signal.
Preferably, described acquisition module includes the described acquisition memory of 2 alternate runs.
Preferably, described traveling wave trigger module includes:
Detect whether described traveling wave analogue signal exceedes default traveling wave threshold value, and when described traveling wave analogue signal exceedes described traveling wave threshold value, send the traveling wave window comparator of the first triggering signal；
It is connected with described controller, the D/A circuit of described traveling wave threshold value is set according to the corresponding control signal of described controller.
Preferably, also include detecting whether described power frequency analogue signal exceedes default power frequency threshold value, and when described power frequency analogue signal exceedes described power frequency threshold value, send power frequency and trigger the power frequency trigger module of signal；
Wherein, described controller is additionally operable to, when receiving described power frequency and triggering signal, send alarm signal to preset alarm terminal.
Preferably, described controller includes the built-in AD conversion unit that the described power frequency analogue signal of described power frequency sensing module output carries out analog digital conversion, and sets described power frequency threshold value；
Described power frequency trigger module includes detecting whether described power frequency analogue signal exceedes described power frequency threshold value analogue signal, and sends the power frequency comparator of described power frequency triggering signal when described power frequency analogue signal exceedes described power frequency threshold value analogue signal；And receive described power frequency threshold value, and the digital signal of described power frequency threshold value is converted into the power frequency threshold value D/A circuit of the power frequency threshold value analogue signal of correspondence.
Preferably, also include:
The temperature sensor being connected with described controller.
Preferably, also include:
The described traveling wave digital data transmission being stored in default memorizer is given the communication module of the extraneous main website preset.
Compared with prior art, technique scheme has the advantage that
The transmission line of electricity transient current harvester that this utility model embodiment provides, including: current sense module, current sense module includes the transient current gathering transmission line of electricity, and export the flexible Luo-coil of the differential signal of transient current, and differential signal is reduced to the active integrating circuit of the traveling wave analogue signal of transient current；It is connected with current sense module, traveling wave analogue signal is carried out analog digital conversion, and the acquisition module of the traveling wave digital signal obtained after storing conversion；It is connected with current sense module and acquisition module, whether detection traveling wave analogue signal exceedes default traveling wave threshold value, and when exceeding traveling wave threshold value, send the first triggering signal triggering collection module and stop traveling wave analogue signal is carried out the traveling wave trigger module of analog digital conversion and storage；It is connected with traveling wave trigger module and acquisition module, reads traveling wave digital signal when the first triggering signal being detected, and traveling wave digital signal is stored the controller to default memorizer.Adopt flexible Luo-coil as the sensory package of current sense module, make current sensor while reducing cost, improve sample frequency and reliability, and without saturated phenomenon, the differential signal that Luo-coil sensor is exported by active integrator is adopted to be integrated, can effectively reduce tested transient current signal, improve sampling precision, it is ensured that transmission line malfunction is accurately positioned.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The transmission line of electricity transient current harvester structural representation that Fig. 1 provides for a kind of detailed description of the invention of this utility model；
The equivalent circuit diagram of the flexible Luo-coil that Fig. 2 provides for a kind of detailed description of the invention of this utility model；
The active integrating circuit ultimate principle circuit diagram that Fig. 3 provides for a kind of detailed description of the invention of this utility model；
The active integrating circuit structural representation that Fig. 4 provides for a kind of detailed description of the invention of this utility model；
The transmission line of electricity transient current harvester structural representation that Fig. 5 provides for this utility model another kind detailed description of the invention；
The transmission line of electricity transient current harvester acquisition precision test platform architecture schematic diagram that Fig. 6 provides for a kind of detailed description of the invention of this utility model.
Detailed description of the invention
Core of the present utility model is to provide a kind of transmission line of electricity transient current harvester, it is possible to be effectively improved sampling precision and reliability, and can effectively reduce the travelling wave signal of transient current, thus ensureing transmission line malfunction is accurately positioned.
Understandable in order to enable above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.
Elaborate detail in the following description so that fully understanding this utility model.But this utility model can be different from alternate manner described here implement with multiple, and those skilled in the art can do similar popularization when without prejudice to this utility model intension.Therefore this utility model is not by the restriction of following public detailed description of the invention.
Refer to Fig. 1, Fig. 2 and Fig. 3, the transmission line of electricity transient current harvester structural representation that Fig. 1 provides for a kind of detailed description of the invention of this utility model；The equivalent circuit diagram of the flexible Luo-coil that Fig. 2 provides for a kind of detailed description of the invention of this utility model；The active integrating circuit ultimate principle circuit diagram that Fig. 3 provides for a kind of detailed description of the invention of this utility model.
In a kind of detailed description of the invention of the present utility model, a kind of transmission line of electricity transient current harvester, including: current sense module 1, current sense module 1 includes the transient current gathering transmission line of electricity, and export the flexible Luo-coil 11 of the differential signal of transient current, and differential signal is reduced to the active integrating circuit 12 of the traveling wave analogue signal of transient current；It is connected with current sense module 1, traveling wave analogue signal is carried out analog digital conversion, and the acquisition module 2 of the traveling wave digital signal obtained after storing conversion；It is connected with current sense module and acquisition module, whether detection traveling wave analogue signal exceedes default traveling wave threshold value, and when exceeding traveling wave threshold value, send the first triggering signal triggering collection module and stop traveling wave analogue signal is carried out the traveling wave trigger module 3 of analog digital conversion and storage；It is connected with traveling wave trigger module and acquisition module, reads traveling wave digital signal the controller 5 stored by traveling wave digital signal to default memorizer 4 when the first triggering signal being detected.
In the present embodiment, adopt flexible Luo-coil that the transient current of transmission line of electricity is acquired, wherein, what flexible Luo-coil collected is the differential signal of electric current, after active integrating circuit, is reduced to current signal, wherein, active integrating circuit needs to coordinate specific flexible Luo-coil parameter to use, and the higher limit of the current amplitude that system can be measured is also relevant with the integral parameter in active integrating circuit, adjusts integral parameter and can change the higher limit measuring current amplitude.
Wherein, what flexible Luo-coil sensing exported is the differential signal of transient current, this transient current is generally lightning current, ignore the effect of flexible Luo-coil distribution capacity, the equivalent circuit of flexible Luo-coil as in figure 2 it is shown, in Fig. 2 L, M, R represent the self-induction of flexible Luo-coil, mutual inductance and internal resistance respectively, I is tested electric current, i is the faradic current of flexible Luo-coil, Rs、usRespectively sampling resistor and sampled voltage.Additionally, uiFor induced potential, according to Luo-coil equivalent circuit, it is known that:
And,
WhenTime, it is reduced to:
From above formula: tested electric current I and sampled voltage uiBetween be the relation of differential, i.e. Luo-coil and external sampling resistor R thereofsIt is substantially equivalent to a differentiation element, it is necessary to be followed by an integrating circuit by voltage uiIntegration, just can make output signals revivification is tested current shape.
In the present embodiment, original transient current signal is restored by active integrating circuit.Active integrating circuit ultimate principle circuit forms as it is shown on figure 3, be made up of resistance R, electric capacity C, OPA amplifier element, and integral principle is: disconnected principle short from the void of amplifier negative-feedback circuit, empty:
I=ui/ R, and uo=uc=1/C ∫ icdt,
Namely applied voltage flows through the electric current of resistance R integration on electric capacity C.
Wherein, in the present embodiment, preferred current sensor includes amplitude traveling wave sensor and low amplitude value traveling wave sensor, amplitude traveling wave sensor includes a set of flexible Luo-coil of correspondence and active integrating circuit, and low amplitude value traveling wave sensor also includes a set of flexible Luo-coil of correspondence and active integrating circuit.
In the present embodiment, tested transmission line of electricity is after the flexible Luo-coil of current sense module, and flexible Luo-coil obtains the differential signal of electric current, and after active integrating circuit, differential signal is reduced to current signal to integration.Under transmission line of electricity non-failure conditions, the traveling wave digital signal that the traveling wave analogue signal of the transient current that current sense module detects is corresponding is stored in acquisition module and calls when occurring in order to fault, the accuracy that during for ensureing fault generation, data process, is stored in the signal demand of acquisition module including at least the some cycles before and after current time point；When an error occurs, the traveling wave analogue signal of transient current exceedes default traveling wave threshold value, so that traveling wave trigger module sends the first triggering signal, triggering collection module suspends the collection to traveling wave analogue signal and storage, go back the traveling wave digital signal that the traveling wave analogue signal of trigger controller reading acquisition module storage is corresponding simultaneously, and store to default memorizer, wherein, controller is read and stored in the signal packet in the memorizer preset containing the some cycles before and after fault time point.
In the present embodiment, as shown in Figure 4, socket P1 is sensor incoming end, flexible Luo-coil is connected with this socket P1, and the two ends of flexible Luo-coil and sampling resistor R1 are respectively connected with, flexible Luo-coil passes through the tested electric current of electromagnetic induction, produces corresponding current differential signal, after flowing through sampling resistor R1, it is thus achieved that corresponding voltage derivative signal.Active integrating circuit in present embodiment is made up of current-limiting resistance R2, operational amplifier U1A, integrating capacitor C2.This current-limiting resistance R2 one end is connected with sampling resistor R1, and the other end is connected with amplifier U1A reverse input end, and the inverting input of this operational amplifier and outfan connect integrating capacitor C2 two ends respectively；Current-limiting resistance R2 converts the voltage derivative signal on sampling resistor R1 to current differential signal; current differential signal flows into integrating capacitor C2 and is integrated; thus restoring tested electric current; in order to ensure the active integrating circuit precision to the reduction of the differential signal of transient current; the inverting input of this operational amplifier is also associated with the filter capacitor C1 of the high-frequency noise for filtering input signal and for protecting the TVS pipe D1 of the input of operational amplifier; wherein, filter capacitor C1 and TVS pipe D1 deviates from one end ground connection of operational amplifier.Further, integrating capacitor C2 is also parallel with a saturated leak resistance R3 of the operational amplifier output preventing offset voltage from causing, wherein, the normal phase input end of operational amplifier is connected to one for reducing the balancing resistance R4 of offset voltage.
Wherein, preferably current sense module includes amplitude traveling wave sensor and low amplitude value traveling wave sensor, amplitude traveling wave sensor includes the first flexible Luo-coil and the first active integrating circuit, low amplitude value traveling wave sensor includes the second flexible Luo-coil and the second active integrating circuit, and the outfan of the first active integrating circuit and the second active integrating circuit is connected with traveling wave modulate circuit respectively.
This utility model adopts the Luo-coil of low-cost and high-performance as sensor, while reducing cost, extends the bandwidth of sample frequency, is absent from magnetic saturation phenomenon when measuring big electric current, improves the reliability of collection；Adopt the differential signal that Luo-coil sensor is exported by active integrator to be integrated, it is possible to effectively reduction tested lightning current signal, improve sampling precision, it is ensured that transmission line malfunction is accurately positioned.
It should be noted that in the present embodiment, the memorizer preset is preferably flash storage.
The device that a kind of embodiment of this utility model provides also includes: detecting and export the power frequency sensing module of the power frequency analogue signal of transmission line of electricity, power frequency sensing module is connected with controller, sets traveling wave threshold value for controller according to power frequency analogue signal.Further, in order to improve the degree of accuracy of power frequency sensing module sampling, power frequency sensing module includes power frequency sensor and power frequency integrator, and power frequency sensor is for gathering the differential signal of the power current of transmission line of electricity, and power frequency integrator is for being reduced to power current by the differential signal of power current.Further, also include whether detection power frequency analogue signal exceedes default power frequency threshold value, and when power frequency analogue signal exceedes power frequency threshold value, send power frequency and trigger the power frequency trigger module of signal；Wherein, controller is additionally operable to, when receiving power frequency and triggering signal, send alarm signal to preset alarm terminal.Controller includes the built-in AD conversion unit that the power frequency analogue signal of power frequency sensing module output carries out analog digital conversion；Power frequency trigger module includes whether detection power frequency analogue signal exceedes power frequency threshold value analogue signal, and sends the power frequency comparator of power frequency triggering signal when power frequency analogue signal exceedes power frequency threshold value analogue signal；And receive power frequency threshold value, and the digital signal of power frequency threshold value is converted into the power frequency threshold value D/A circuit of the power frequency threshold value analogue signal of correspondence.
In the present embodiment, the voltage noise grade that the power frequency analogue signal that controller exports according to power frequency sensing module reflects sets traveling wave threshold value, and the traveling wave threshold value of setting is sent to the D/A circuit of traveling wave trigger module, this traveling wave threshold value is carried out DA conversion by D/A circuit, and the traveling wave analogue signal traveling wave threshold value analogue signal after conversion being flowed to traveling wave comparator and detection compares.Wherein, controller is the electric pressure, the information such as background noise that reflect according to the power frequency analogue signal received, dynamically arranges current traveling wave threshold value according to default algorithm etc..Due in present embodiment, traveling wave threshold value is the information that reflects of the power frequency analogue signal according to current transmission line of electricity and dynamically arranges, can effectively prevent the very noisy on power transmission line from causing system false triggering, system rejection to disturbance ability is made to strengthen, collection result is more reliable, to ensure transmission line malfunction is accurately positioned.
When power frequency itself breaks down, power frequency analogue signal exceedes the power frequency threshold value arranged from power frequency threshold value D/A circuit, so that power frequency comparator sends power frequency triggers signal, sends alarm signal with trigger controller to default alarm terminal, reports to the police.Thus ensure that the reliability that traveling wave threshold value sets, it is to avoid mistake occurs in the traveling wave threshold value that the controller caused due to the fault of power frequency own sets.
The transmission line of electricity transient current harvester that a kind of embodiment of this utility model provides also includes: the traveling wave analogue signal that current sense module is exported carries out the traveling wave modulate circuit of signal amplitude adjustment, filtering and level lifting；The power frequency analogue signal that power frequency sensing module is exported carries out the power frequency modulate circuit of signal amplitude adjustment, filtering and level lifting.
In the present embodiment, preferred traveling wave modulate circuit is after the traveling wave analogue signal receiving the output of current sense module, by the signal level lifting+2.5V after integration, the amplitude making the transient current signal of positive and negative polarity is nursed one's health in 0～+5V scope, to meet the voltage acquisition scope of acquisition module.Wherein, when including amplitude traveling wave sensor and low amplitude value traveling wave sensor when current sensor, amplitude traveling wave sensor and low amplitude value traveling wave sensor are all connected with each self-corresponding traveling wave modulate circuit.Power frequency modulate circuit by signal level lifting+1.5V, makes the power frequency current signal amplitude of positive-negative polarity nurse one's health in 0～+3V scope, to meet the voltage acquisition scope of power frequency Acquisition Circuit in controller after the integrated signal receiving power frequency sensing module.
In a kind of embodiment of the present utility model, acquisition module includes: the traveling wave analogue signal that current sense module is exported carries out the converter of analog digital conversion；It is connected with converter, the acquisition memory of the traveling wave digital signal of storage converter output；It is connected with traveling wave trigger module, when receiving the first triggering signal, controls converter and stop AD conversion and output, and control the acquisition controller of acquisition memory stopping reception and storage line ripple digital signal.Preferably, acquisition module includes 2 acquisition memory, this acquisition memory is high speed acquisition memorizer, the traveling wave analogue signal that two high speed acquisition memorizeies store amplitude traveling wave sensor and low amplitude value traveling wave sensor collection respectively be AD converted after digital signal.Traveling wave trigger module includes: whether detection traveling wave analogue signal exceedes default traveling wave threshold value, and when wave simulation signal of being expert at exceedes traveling wave threshold value, sends the traveling wave window comparator of the first triggering signal；It is connected with controller, the D/A circuit of traveling wave threshold value is set according to the corresponding control signal of controller.
In the present embodiment, converter and analog-digital converter, traveling wave comparator receives the traveling wave analogue signal of traveling wave modulate circuit output and D/A circuit receives controller and sends the activation threshold value of coming, and travelling wave signal and threshold signal are compared；Wherein, D/A circuit receives controller and sends the activation threshold value signal of coming, and this activation threshold value is carried out digital-to-analogue conversion, resolves to the traveling wave threshold value of correspondence.Acquisition controller controls converter and traveling wave analogue signal is AD converted, and controls acquisition memory AD conversion value is stored；When acquisition controller is when receiving the first triggering signal, control converter and stop conversion, and control acquisition memory stopping storage.
In the present embodiment, traveling wave comparator is window comparator, the voltage noise grade that reflects according to power frequency current signal during fault-free on the gathered transmission line of electricity of power frequency sensing module owing to traveling wave threshold values is controller and synthetic setting, set upper and lower two threshold values and form window comparator, compared by upper and lower threshold value and traveling wave analogue signal, can learn whether tested transmission line of electricity breaks down, if the amplitude of travelling wave signal exceeds upper and lower threshold value scope, send the first triggering signal, then do not trigger in upper and lower threshold range.Window comparator capacity of resisting disturbance is strong, can prevent owing to the noise jamming on power transmission line is to causing comparator false triggering.
In a kind of embodiment of the present utility model, transmission line of electricity transient current harvester, also include: the temperature sensor being connected with controller.The setting of temperature sensor, the temperature parameter of the environment residing for this device detected can be sent to controller, to calculate earth resistance, when controller calculates traveling wave threshold value, using this temperature parameter as the parameter affecting traveling wave threshold value, so that the calculating of traveling wave threshold value is more accurate, it is ensured that transmission line malfunction is accurately positioned.
Wherein, this device also includes: will be stored in the traveling wave digital signal in the memorizer preset and relevant information is transferred to the communication module of the extraneous main website preset.After this device acquires the transient current of transmission line of electricity, the signal of collection is sent to the external world by communication module.Communication module is connected with controller, it is possible to the data existed in the memorizer preset and above-mentioned alarm signal are transferred out.Wherein, this communication module can be the wireless network communication module such as ZIGBEE or GPRS, but and is confined to this two kinds of communication modules.
Refer to the transmission line of electricity transient current harvester structural representation that Fig. 5, Fig. 5 provide for this utility model another kind detailed description of the invention.
nullIn a kind of detailed description of the invention of the present utility model，As shown in Figure 4，Current sense module includes a low amplitude value traveling wave sensor 102 and an amplitude traveling wave sensor 101 and the corresponding traveling wave modulate circuit 103 being connected with it，Power frequency sensing module 3 is connected with power frequency modulate circuit 7，Traveling wave trigger module 3 includes an interconnective traveling wave window comparator 301 and a traveling wave threshold value D/A circuit 302，Power frequency trigger module 8 includes an interconnective power frequency window comparator 801 and a power frequency threshold value D/A circuit 802，Acquisition module 2 includes high speed acquisition controller CPLD (CPLD) 205、Two converter A/D1201 and A/D2203、And two models are IS61WV102416BLL、Capacity is 1M × 16bit、High speed acquisition memorizer SRAM1202 and the SRAM2204 of 5 cycles can be stored in，Communication module is GPRS9，The memorizer preset is SPIflash (serial flash memory) 5，Controller is MCU (single-chip microcomputer) 4；In above-mentioned device, low amplitude value traveling wave sensor and amplitude traveling wave sensor all include flexible Luo-coil and the active integrating circuit being attached thereto.
Below the work process of the device in present embodiment is further elucidated with:
Tested transmission line of electricity is through low amplitude value traveling wave sensor and amplitude traveling wave sensor, and the mode of this twin coil synchronous acquisition can realize the precise acquisition to transmission line of electricity 100A-100kA transient fault electric current.Under non-failure conditions, the traveling wave analogue signal of the transient current that low amplitude value traveling wave sensor and/or amplitude traveling wave sensor detect is after traveling wave modulate circuit is nursed one's health, under the control of high speed acquisition controller CPLD, it is AD converted respectively through converter A/D1 and A/D2, and is stored in high speed acquisition memorizer SRAM1 and SRAM2 respectively and calls when occurring in order to fault.Wherein, CPLD exports the clock control signal CLK of 10M to A/D1 and A/D2 to control its sampling rate, controls SRAM1 and SRAM2 simultaneously and stores the data from A/D1 and A/D2 respectively.CPLD also holds with the UART (universal asynchronous receiving-transmitting transmission) of MCU and is bi-directionally connected.
When fault occurs, traveling wave analogue signal from the transient current of traveling wave modulate circuit exceedes the traveling wave threshold value set of the MCU from traveling wave threshold value D/A converter, so that traveling wave comparator sends traveling wave triggers signal, this traveling wave triggers signal and triggers the conversion to traveling wave analogue signal of CPLD control A/D1 and the A/D2 time-out, and suspend SRAM1 and SRAM2 the traveling wave digital signal that traveling wave analogue signal is corresponding is stored, and give MCU by 32bit data/address bus control, also trigger MCU read the traveling wave analogue signal comprising totally 5 cycles before and after fault transient state current of storage in SRAM1 and SRAM2 by 32bit data/address bus and be stored in memorizer SPIflash simultaneously, and it is sent to outside main website by GPRS.The establishing method of above-mentioned traveling wave threshold value be MCU according to current by built-in AD receive from information such as the electric pressure of power frequency simulated reflected signal of power frequency modulate circuit, background noises, set current traveling wave threshold value.
In sum, transmission line of electricity transient current harvester provided by the utility model, adopt flexible Luo-coil as the sensory package of current sense module, the electric elements such as cheap resistance and electric capacity are utilized to constitute active integrating circuit, debugging is coordinated, it is determined that circuit parameter, it is achieved that the accurate measurement to fault transient state current with actual flexible Luo-coil, eliminate restricted problem and the magnetic saturation problem of tradition transformer bandwidth, and precise acquisition and the waveform reduction of big current amplitude can be realized.This utility model is adopting on the basis of collection realizing transient fault electric current based on the flexible Luo-coil of active integration, in combination with information such as the electric pressure of power frequency simulated reflected signal of power frequency sensing module collection, background noises, dynamically set current traveling wave threshold value, so can improve the ability of system rejection to disturbance, prevent traveling wave trigger module and cause false triggering because of the very noisy on power transmission line, it is ensured that transmission line malfunction is carried out pinpoint reliability.
In order to ensure that this utility model is provided the acquisition precision of a kind of transmission line of electricity transient current harvester.Said apparatus has also been verified by this utility model one embodiment.
In the present embodiment, test platform as shown in Figure 6 is constructed.Adopt impulse current generator as traveling wave source, produce the normalized current waveform of 8/20 μ s difference amplitude and polarity, normalized current sensor and oscillograph constitute standard acquisition circuit simultaneously, and harvester compares to obtain the precision of acquisition system by the waveform of the waveform gathered and preferred circuit.Preset impulse current generator output electric current is 90A, 800A, 10KA and 25KA successively, carries out positive and negative each 2 Secondary Shocks discharge tests, reads corresponding reading respectively from digital storage oscilloscope and sample.
Experimental data calculates respectively monitor and feedback by following formula, and its result need to meet requirement:
In formula:
δ amplitude error；
Im0Digital storage oscilloscope amplitude reading；
Im1Sample amplitude reading.
Test result is as shown in table 1:
By upper table data it can be seen that adopt the transmission line of electricity transient current harvester that present embodiment provides, it is little that transient current gathers monitor and feedback, and sampling precision is high.
This utility model is provided a kind of transmission line of electricity transient current harvester be described in detail above.Principle of the present utility model and embodiment are set forth by specific case used herein, and the explanation of above example is only intended to help and understands this utility model and core concept thereof.Should be understood that; for those skilled in the art; under the premise without departing from this utility model principle, it is also possible to this utility model carries out some improvement and modification, these improve and modification also falls in this utility model scope of the claims.
Claims (10)
1. a transmission line of electricity transient current harvester, it is characterised in that including:
Current sense module, described current sense module includes the transient current gathering transmission line of electricity, and exports the flexible Luo-coil of the differential signal of described transient current, and described differential signal is reduced to the active integrating circuit of the traveling wave analogue signal of transient current；
It is connected with described current sense module, described traveling wave analogue signal is carried out analog digital conversion, and the acquisition module of the traveling wave digital signal obtained after storing conversion；
It is connected with described current sense module and described acquisition module, detect whether described traveling wave analogue signal exceedes default traveling wave threshold value, and when exceeding described traveling wave threshold value, send the first triggering signal and trigger the described acquisition module stopping traveling wave trigger module to described traveling wave analogue signal operation analog digital conversion and storage；
It is connected with described traveling wave trigger module and described acquisition module, reads described traveling wave digital signal when described first triggering signal being detected, and described traveling wave digital signal is stored the controller to default memorizer.
2. device according to claim 1, it is characterised in that also include:
Detecting and export the power frequency sensing module of the power frequency analogue signal of described transmission line of electricity, described power frequency sensing module is connected with described controller, sets described traveling wave threshold value for described controller according to described power frequency analogue signal.
3. device according to claim 2, it is characterised in that also include:
The traveling wave analogue signal that described current sense module is exported carries out the traveling wave modulate circuit of signal amplitude adjustment, filtering and level lifting；
The power frequency analogue signal that described power frequency sensing module is exported carries out the power frequency modulate circuit of signal amplitude adjustment, filtering and level lifting.
4. device according to claim 3, it is characterised in that described acquisition module includes:
The traveling wave analogue signal that described current sense module is exported carries out the converter of analog digital conversion；
It is connected with described converter, stores the acquisition memory of the traveling wave digital signal of described converter output；
It is connected with described traveling wave trigger module, when receiving described first and triggering signal, controls described converter and stop AD conversion and output, and control the acquisition controller of the stopping reception of described acquisition memory and storage line ripple digital signal.
5. device according to claim 4, it is characterised in that described acquisition module includes the described acquisition memory of 2 alternate runs.
6. device according to claim 5, it is characterised in that described traveling wave trigger module includes:
Detect whether described traveling wave analogue signal exceedes default traveling wave threshold value, and when described traveling wave analogue signal exceedes described traveling wave threshold value, send the traveling wave window comparator of the first triggering signal；
It is connected with described controller, the D/A circuit of described traveling wave threshold value is set according to the corresponding control signal of described controller.
7. device according to claim 6, it is characterised in that also include detecting whether described power frequency analogue signal exceedes default power frequency threshold value, and when described power frequency analogue signal exceedes described power frequency threshold value, send power frequency and trigger the power frequency trigger module of signal；
Wherein, described controller is additionally operable to, when receiving described power frequency and triggering signal, send alarm signal to preset alarm terminal.
8. device according to claim 7, it is characterised in that described controller includes the built-in AD conversion unit that the described power frequency analogue signal of described power frequency sensing module output carries out analog digital conversion, and sets described power frequency threshold value；
Described power frequency trigger module includes detecting whether described power frequency analogue signal exceedes described power frequency threshold value analogue signal, and sends the power frequency comparator of described power frequency triggering signal when described power frequency analogue signal exceedes described power frequency threshold value analogue signal；And receive described power frequency threshold value, and the digital signal of described power frequency threshold value is converted into the power frequency threshold value D/A circuit of the power frequency threshold value analogue signal of correspondence.
9. the device according to any one of claim 2 to 8, it is characterised in that also include:
The temperature sensor being connected with described controller.
10. device according to claim 9, it is characterised in that also include:
The described traveling wave digital data transmission being stored in default memorizer is given the communication module of the extraneous main website preset.
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| CN201620127388.6U CN205404670U (en) | 2016-02-18 | 2016-02-18 | Transmission line transient state current collection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105717353A (en) * | 2016-02-18 | 2016-06-29 | 四川中光防雷科技股份有限公司 | Power transmission line transient current collecting device |
| CN107592111A (en) * | 2017-09-04 | 2018-01-16 | 中国电子科技集团公司第四十研究所 | A kind of anti-error frequency dividing of pulse-modulated signal designs circuit and method |
| CN108089082A (en) * | 2018-01-16 | 2018-05-29 | 中国南方电网有限责任公司超高压输电公司曲靖局 | High voltage direct current neutral bus arrester performance on-line monitoring system and method |
| CN109342803A (en) * | 2018-09-21 | 2019-02-15 | 广州发展集团股份有限公司 | Current detecting system, method, apparatus, computer equipment and storage medium |
| CN109564258A (en) * | 2016-08-17 | 2019-04-02 | 通用电器技术有限公司 | About or being located in improvement in the failure in power transmission pipeline |
| CN116027214A (en) * | 2023-03-30 | 2023-04-28 | 湖北蓝博新能源设备股份有限公司 | Battery detection equipment and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105717353A (en) * | 2016-02-18 | 2016-06-29 | 四川中光防雷科技股份有限公司 | Power transmission line transient current collecting device |
| CN109564258A (en) * | 2016-08-17 | 2019-04-02 | 通用电器技术有限公司 | About or being located in improvement in the failure in power transmission pipeline |
| CN107592111A (en) * | 2017-09-04 | 2018-01-16 | 中国电子科技集团公司第四十研究所 | A kind of anti-error frequency dividing of pulse-modulated signal designs circuit and method |
| CN108089082A (en) * | 2018-01-16 | 2018-05-29 | 中国南方电网有限责任公司超高压输电公司曲靖局 | High voltage direct current neutral bus arrester performance on-line monitoring system and method |
| CN108089082B (en) * | 2018-01-16 | 2023-11-24 | 中国南方电网有限责任公司超高压输电公司曲靖局 | High-voltage direct-current neutral bus arrester performance on-line monitoring system and method |
| CN109342803A (en) * | 2018-09-21 | 2019-02-15 | 广州发展集团股份有限公司 | Current detecting system, method, apparatus, computer equipment and storage medium |
| CN116027214A (en) * | 2023-03-30 | 2023-04-28 | 湖北蓝博新能源设备股份有限公司 | Battery detection equipment and system |
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