CN106338704A - Real-time detection device suitable for failure and electricity larceny prevention of metering current transformer - Google Patents
Real-time detection device suitable for failure and electricity larceny prevention of metering current transformer Download PDFInfo
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- CN106338704A CN106338704A CN201510410930.9A CN201510410930A CN106338704A CN 106338704 A CN106338704 A CN 106338704A CN 201510410930 A CN201510410930 A CN 201510410930A CN 106338704 A CN106338704 A CN 106338704A
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Abstract
The invention provides a real-time detection device suitable for failure and electricity larceny prevention of a metering current transformer. The real-time detection device at least comprises a high-frequency excitation module, a signal gain control module, a signal coupling module, a signal sampling module, a signal processing module, a judgment module, a state output module, a power supply module and a state recording module. Compared with the existing metering current transformer detection device, the real-time detection device couples and outputs a high-frequency excitation signal of the high-frequency excitation module to a strong current loop of the metering current transformer by means of the signal gain control module, and couples a high-frequency feedback signal of the strong current loop of the metering current transformer to the signal sampling module. Therefore, the reliable adoption of sampled signals can be realized, and the situation that missed detection occurs or methods and devices in the prior art cannot adapt to the sampling of metering current transformers of different specifications and materials is avoided.
Description
Technical field
The invention belongs to the current transformer failure metering in electric energy metrical or thief-proof electro-detection, more particularly to a kind of it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus.
Background technology
In prior art, the fault of metering current mulual inductor and thief-proof electro-detection, are typically directed to the faults such as the reduction of secondary coil insulating properties, turn-to-turn short circuit, input and output terminal loose contact, transformer ratio, the artificial open circuit of secondary output loop and the short circuit of metering current mulual inductor and are detected.Its detection method typically in the erecting bed of metering current mulual inductor, is estimated by artificial, is carried out casual inspection to the kilowatt-hour meter in the outward appearance of metering current mulual inductor, external wiring terminal and electric power meter.Its testing result generally to be judged by following several ways: 1) determines that metering current mulual inductor whether there is a small amount of characterization failures such as input and output terminal loose contact, secondary output loop open circuit and short circuit according to the whether improper metering of the kilowatt-hour meter in the cosmetic variation of metering current mulual inductor, the connection of external wiring terminal and electric power meter；2) common voltage table and ammeter are adopted, the voltage and current of monitoring electricity system, the variable quantity according to the presence or absence of electricity system voltage and system power and variation tendency whether there is fault estimating metering current mulual inductor；3) input in electric network source installs prime dedicated test current transformer additional, according to the quantity of dedicated test current transformer and the secondary output current value of metering current mulual inductor poor, performance number quantity is poor, the quantity difference of electric degree number judges that metering current mulual inductor whether there is fault or stealing.There is the defects such as real-time, accuracy, poor reliability in several detection modes above in utilization, on-line checking ability is extremely limited and affects, stealing detection is with judged result verity difference it is impossible to meet current transformer failure metering or anti-electricity-theft accurate, the detection of reliability, real-time online use requirement.
In addition, earlier application patent cn20041008189(hereinafter referred: formerly patent) have been disclosed for " a kind of current transformer failure metering or anti-electricity-theft real-time on-line detecting method and device ", find in actual use, this formerly the high-frequency excitation signal in patent directly connect signal sampling module by signal coupling module, the sampled signal obtaining acquired in sampling module is made to there is certain uncertainty, in some cases, exist and partial mutual inductance device is not adapted to, so that occur failing to report wrong report situation, therefore necessary make improvements.
Content of the invention
It is an object of the invention to provide a kind of be suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, for solving the problems, such as test leakage occurs in prior art or cannot sample.
For achieving the above object and other related purposes, the present invention provides technical scheme below:
A kind of it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus，Including high frequency pumping module、Signal coupling module、Signal sampling module、Signal processing module、Judge module、State output module、Power module、Clock module、State recording module、State display module and network communication module，Also include a signal gain control module，Wherein，High frequency pumping module，For producing high-frequency excitation signal，And provide high-frequency excitation signal by signal gain control module to signal coupling module，And provide reference signal to signal processing module simultaneously，Signal coupling module，High frequency pumping module and signal sampling module are connected to by signal gain control module，Signal coupling module is used for isolating the forceful electric power loop of metering current mulual inductor、The weak electrical loop of high frequency pumping module and the weak electrical loop of signal sampling module，Signal coupling module passes through signal gain control module and exports the high-frequency excitation signal coupling of high frequency pumping module to the forceful electric power loop of metering current mulual inductor，And the high frequency feedback signal in the forceful electric power loop of metering current mulual inductor is coupled and signal sampling module；Signal sampling module, the high frequency feedback signal for forceful electric power loop in metering current mulual inductor that signal coupling module is provided carries out in real time formerly being exported a feedback signal extremely described signal processing module after signal sampling, amplifications, filtering and Shape correction；Described signal processing module, it is connected to high frequency pumping module and signal sampling module, reference signal for providing high frequency pumping module carries out analog-to-digital conversion process and the feedback signal of signal sampling module offer is carried out analog digital conversion, digital filtering and fourier transform process, to obtain reference signal after treatment and feedback signal, and by reference signal after treatment and feedback signal output to described judge module；Judge module, is connected to signal processing module, for accident analysis judgement carried out to reference signal after treatment and feedback signal, and the fault type belonging to determining accident analysis judged result as preset failure type, and export corresponding fault type indication signal；State output module, is connected to described judge module, for receiving described fault type indication signal, and exports current transformer failure metering or anti-electricity-theft type according to preset standard data form and instead gives birth to separate accordingly；Power module, at least includes supply convertor, manostat and standby battery group, for providing working power for detection means, and is switched to power module by described supply convertor when breaking down and is powered using described standby battery group.
Preferably, also include: for providing the clock module of current time；State recording module, is connected to judge module and clock module, and beginning and ending time, fault type and generation for recording fault when fault occurs are separate.
Preferably, also include a state display module, be connected to described state recording module, beginning and ending time, fault type and generation for showing the described fault recorded in described state recording module are separate.
Preferably, also include a network communication module, it is connected to described state recording module, for being recorded described state recording module according to preset standard communication protocol when instead giving birth to fault at least include beginning and ending time of fault, fault type and occurring the fault message including separate to be uploaded to Surveillance center.
Preferably, described signal gain control module includes the operational amplifier of model sa5534ad, wherein, the in-phase input end of described operational amplifier is connected to an end node being connected in parallel by electric capacity and first resistor, another end node that described electric capacity and first resistor are connected in parallel is connected to one end of second resistance, the other end of described second resistance is connected to the inverting input of described operational amplifier by 3rd resistor, it is connected in parallel to the suitable switches set being connected to signal coupling module end mutual voltage of multiple confessions between the inverting input of described operational amplifier and outfan, each described switches set is that have a resistance and analog switch to be connected in series.
Preferably, the resistance sizes that described switches set is at least included in first switch group, second switch group, the 3rd switches set and the 4th switches set, and described first switch group, second switch group, the 3rd switches set and the 4th switches set correspond to 20k, 51 k, 100 k and 200 k.
In sum, the present invention at least has the advantages that compared with existing metering current mulual inductor detection means, by being exported the high-frequency excitation signal coupling of high frequency pumping module to the forceful electric power loop of metering current mulual inductor by signal gain control module, and the high frequency feedback signal in the forceful electric power loop of metering current mulual inductor is coupled and signal sampling module；Thus realizing adopting for the reliability of sampled signal, it is to avoid in prior art missing inspection or the situation of flase drop occur.In addition the detection means that this programme provides can detect to current transformer failure metering or anti-electricity-theft real-time online of realizing under the various methods of operation of high and low voltage electric distribution electrical network, the present invention has network communicating function, can real-time faults various in electric power meter be reported to the police.Can not only be used for the function expanding module of other correlation measurement instruments in electric energy metrical, also can be separately formed the failure detector of metering current mulual inductor；Can current transformer failure metering in the existing electric energy metrical of the effectively solving or accuracy in thief-proof electro-detection is low, real-time and poor reliability, do not enable the key issues such as on-line checking, can be widely applied to power system electric energy metrical and thief-proof electro-detection record.
Brief description
For the scheme being illustrated more clearly that in the embodiment of the present invention, the accompanying drawing of use required described in specific embodiment will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those skilled in the art, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
A kind of a kind of embodiment schematic diagram being suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus that accompanying drawing 1 provides for the present invention.
A kind of another embodiment schematic diagram being suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus that accompanying drawing 2 provides for the present invention.
Accompanying drawing 3 is high frequency pumping module circuit diagram.
Accompanying drawing 4 is signal coupling module circuit diagram.
Accompanying drawing 5 is signal sampling module circuit diagram.
Accompanying drawing 6 is signal processing module circuit diagram.
Accompanying drawing 7 is signal gain control module circuit diagram.
Accompanying drawing 8 is judge module circuit diagram.
Accompanying drawing 9 is state output module circuit diagram.
Accompanying drawing 10 is power module circuitry figure.
Accompanying drawing 11 is clock module circuit diagram.
Accompanying drawing 12 is state recording module circuit diagram.
Accompanying drawing 13 is state display module circuit diagram.
Accompanying drawing 14 is network communication module circuit diagram.
Drawing reference numeral explanation
1 high frequency pumping module
2 signal coupling modules
3 signal sampling modules
4 signal processing modules
5 judge modules
6 state output modules
7 power modules
8 clock modules
9 state recording modules
10 state display module
11 network communication modules
12 signal gain control modules
121 electric capacity
122nd, 123,124,125,126,127 resistance
128 switches set
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on embodiments of the invention, all other embodiment that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into the scope of protection of the invention.
Refer to Fig. 1，The present invention is provided a kind of schematic diagram being suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus of offer，As shown in the figure，Described it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus include high frequency pumping module 1、Signal coupling module 2、Signal sampling module 3、Signal processing module 4、Judge module 5、State output module 6、Power module 7、Clock module 8、State recording module 9、State display module 10 and network communication module 11，Also include a signal gain control module 12，Wherein，High frequency pumping module 1，For producing high-frequency excitation signal，And provide high-frequency excitation signal by signal gain control module 12 to signal coupling module 2，And provide reference signal to signal processing module 4 simultaneously，Signal coupling module 2，High frequency pumping module 1 and signal sampling module 3 are connected to by signal gain control module 12，Signal coupling module 2 is used for isolating the forceful electric power loop of metering current mulual inductor、The weak electrical loop of high frequency pumping module 1 and the weak electrical loop of signal sampling module 3，Signal coupling module 2 passes through signal gain control module 12 and exports the high-frequency excitation signal coupling of high frequency pumping module 1 to the forceful electric power loop of metering current mulual inductor，And the high frequency feedback signal in the forceful electric power loop of metering current mulual inductor is coupled and signal sampling module 3；Signal sampling module 3, the high frequency feedback signal for forceful electric power loop in metering current mulual inductor that signal coupling module 2 is provided carries out in real time formerly being exported a feedback signal extremely described signal processing module 4 after signal sampling, amplifications, filtering and Shape correction；Described signal processing module 4, it is connected to high frequency pumping module 1 and signal sampling module 3, reference signal for providing high frequency pumping module 1 carries out analog-to-digital conversion process and the feedback signal that provides signal sampling module 3 carries out analog digital conversion, digital filtering and fourier transform and processes, to obtain reference signal after treatment and feedback signal, and by reference signal after treatment and feedback signal output to described judge module 5；Judge module 5, it is connected to signal processing module 4, for accident analysis judgement carried out to reference signal after treatment and feedback signal, and the fault type belonging to determining accident analysis judged result as preset failure type, and export corresponding fault type indication signal；State output module 6, is connected to described judge module 5, for receiving described fault type indication signal, and exports current transformer failure metering or anti-electricity-theft type according to preset standard data form and instead gives birth to separate accordingly；Power module 7, at least includes supply convertor, manostat and standby battery group, for providing working power for detection means, and is switched to power module 7 by described supply convertor when breaking down and is powered using described standby battery group.
Further, in conjunction with Fig. 2, show a kind of another embodiment schematic diagram being suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus that the present invention provides, above-mentioned real-time detection apparatus also include: for providing the clock module 8 of current time；State recording module 9, is connected to judge module 5 and clock module 8, and beginning and ending time, fault type and generation for recording fault when fault occurs are separate.More specifically, also including a state display module 10, it is connected to described state recording module 9, beginning and ending time, fault type and generation for showing the described fault recorded in described state recording module 9 are separate.Again specifically, also include a network communication module 11, it is connected to described state recording module 9, for being recorded described state recording module 9 according to preset standard communication protocol when instead giving birth to fault at least include beginning and ending time of fault, fault type and occurring the fault message including separate to be uploaded to Surveillance center.
Below in conjunction with accompanying drawing 3-13 the present invention is provided be suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus are further described:
This programme provide in real-time detection apparatus, refer to Fig. 3, the circuit of described high frequency pumping module 11 includes: sine-wave generator is constituted by integrated operational amplifier u15 (lm324), resistance r54-r57 (1k), r58 r59 (10k), electric capacity c51 c54 (4700p), c55 c57 (o.oluf)；High frequency pumping module 11 produces the frequency of 30khz～60 khz and the amplitude high-frequency signal of 1v～3v, and high-frequency signal is defeated by signal coupling module 2 as pumping signal, and as reference signal, high-frequency signal is defeated by signal processing module 4 simultaneously；Refer to Fig. 4, the circuit of signal coupling module 2 includes: coupling retarder l1 l2 (10t), transient voltage absorption diode sa1 sa2 (sa5.oca), resistance rl0 (2.7k)；Signal coupling module 2 isolates the forceful electric power loop of high frequency pumping module 1 and metering current mulual inductor, and export high-frequency excitation signal to the forceful electric power return circuit coupling of metering current mulual inductor, signal coupling module 2 isolation signals sampling module 3 and the forceful electric power loop of metering current mulual inductor, and the high frequency feedback signal in metering current mulual inductor forceful electric power loop is coupled to signal sampling module 3, signal coupling module 2 eliminates the impact of heavy current loop real-time detection apparatus and the destruction of metering current mulual inductor by isolation coupling；Please participate in Fig. 5, the circuit of signal sampling module 3 includes: integrated operational amplifier ul (lm324), resistance rll～r15 (5.1k), r16 (15k), electric capacity c5 (o.oluf)；High frequency feedback signal in the forceful electric power loop that signal sampling module 3 produces to signal coupling module 2 carries out real-time online signal sampling, amplification, filtering, Shape correction, and the feedback signal after processing is defeated by signal processing module 4；Refer to Fig. 6, the circuit of signal processing module 4 includes: digital integrated electronic circuit u4 (ti, c1543c), microprocessor u5 (p89c668), the feedback signal that signal processing module 4 provides to signal sampling module 3 carries out analog digital conversion, digital filtering, fourier transform are processed and filters the electrical network fundamental signal harmonic signal in feedback signal, and feedback signal is transformed into is not defeated by judge module 5 by the phase digital signal of line voltage and loading effects, amplitude digital signal.
In further detail，Refer to Fig. 7，Described signal gain control module 12 includes an operational amplifier (model: sa5534ad)，Wherein，The in-phase input end (i.e. pin 3) of described operational amplifier is connected to an end node being connected in parallel by electric capacity 121 and resistance 122，Another end node that described electric capacity 121 and resistance 122 are connected in parallel is connected to one end of resistance 123，The other end of described resistance 123 is connected to the inverting input of described operational amplifier (i.e. pin 2) by resistance 124，The pin 4 and 5 of described operational amplifier connects power supply and the ub1 end of -12v respectively，The pin 7 of described operational amplifier and 8 power supply and ub1 ends connecting+12v respectively，In addition，An electric capacity can also be set between the pin 8 of described operational amplifier and ub1 end，The pin 7 of described operational amplifier simultaneously、8 and 1 is connected respectively in resistance 125、Resistance 126 and one end of resistance 127，And resistance 125、The other end of resistance 126 and resistance 127 connects jointly，It is connected in parallel to the suitable switches set 128 being connected to signal coupling module end mutual voltage of multiple confessions between the inverting input (pin 2) of described operational amplifier and outfan (pin 6)，Wherein，Described switches set at least includes first switch group、Second switch group、3rd switches set and the 4th switches set，Each switches set is that have a resistance and analog switch to be connected in series，Preferably，Described first switch group、Second switch group、Resistance sizes in 3rd switches set and the 4th switches set correspond to 20k、51 k、100 k and 200 k.
In accompanying drawing 8，The circuit of judge module 5 includes: microprocessor u5 (p89c668)，The reference phase digital signal that judge module 5 provides to signal processing module 4、Reference amplitude digital signal、Feedback phase digital signal and feedback magnitude digital signal carry out current transformer failure metering or the judgement of thief-proof electroanalysis，Its breakdown judge principle is: adopts phase-comparison method、Amplitude com parison method、Adaptive algorithm etc.，In feedback signal complicated and changeable，Extract current transformer failure metering or anti-electricity-theft various features signal，And according to current transformer failure metering or anti-electricity-theft characteristic signal，Analysis judges in electric energy metrical, whether metering Current Transformer Secondary coil insulation performance reduces、Whether turn-to-turn is short-circuit、Input and output terminal whether loose contact、Whether transformer ratio changes、And whether secondary output loop open a way and the fault such as short circuit，And export to state output module 6 to after failure modes identification.
In accompanying drawing 9, the circuit of state output module 6 includes: microprocessor u5 (p89c668), photoisolator op1～op2 (ps2501-1), light emitting diode led, buzzer (speaker), resistance r17 r18 (1k), r20 (1k), r21 (10k);State output module 6 be used for exporting judge module 5 offer fault is separate and fault type signal.State output module 6 has the multi-signal way of output, signal output can be at least the modes such as coding output, data/address bus output, the output of i2c bus, level output, and state output module 6 also to current transformer failure metering or anti-electricity-theft can carry out real-time online sound and light alarm.
In fig. 10, the circuit of power module 7 includes: mains transformer tl, rectifier bridge d8, electrochemical capacitor c8 c9 (2200uf), resistance r30-r31 (2.2k), diode d9 d14 (1n4007), backup batteries bt2-1～bt2.1 (6v), integrated stable voltage circuit u2 (7805), u3 (7905);Power module 7 provides working power for detection means, and when detection means external power source dead electricity, power module 7 uninterruptedly starts backup batteries provides working power for detection means.
Another modular structure block diagram of the present invention is given by accompanying drawing 2, and it increased clock module 8, state recording module 9, state display module 10, network communication module 11 on the basis of accompanying drawing l, for another enforcement purpose of this programme.In accompanying drawing 11, the circuit of clock module 8 includes: clock circuit u6 (pcf8563f), set of cells btl
(3.6v), resistance r26 (10r), electric capacity c4
(o.luf), c6～c7
(22p), diode d3 (1n4007), crystal oscillator xt1 (32.768k);Clock module 8 provides real-time timing signal for detection means, and clock module 8 has clock proofreading function.
In accompanying drawing 12, the circuit of state recording module 9 includes: digital memory u7 (24lc256)；State recording module 9, under judge module 5, the co- controlling of clock module 8, occurs to current transformer failure metering or anti-electricity-theft initial time and end time, failure mode, fault separate to carry out accurate recording；All data of state recording module 9 have password and power-down protection, include at least faulty initial time and end time, failure mode, fault occur the data such as separate in every record data content.The operational factor of the recordable metering current mulual inductor of state recording module 9, the such as master data such as set-up time, re-testing periods, current transformer arrangement numbering, metering method, transformer ratio, operational factor record equally has password and power-down protection.The data record of state recording module 9 may be output to state display module 10 and network communication module 11.
In accompanying drawing 13, the circuit of state display module 10 includes: microprocessor u5 (p89c668), Chinese LCD lcd, digital integrated electronic circuit u8 (74hc04), u9
(74hcoo);State display module 10 is subject to the co- controlling of clock module 8 and state recording module 9, the current dynamic time data that read clock module 8 provides, and the data such as the fault data in dispaly state logging modle 9, operational factor.
In accompanying fig. 14, the circuit of network communication module 11 includes: microprocessor u5 (p89c668), integrated circuit ul0 (
Max1487), resistance r19 (1k), r22 r25 (10k), r27～r28 (680r), r29
(2k) photoisolator op3-op5 (ps2501-1), diode d4～d7 (1n4007);The output interface of network communication module 11 includes rs232 interface and rs485 interface, with Surveillance center of management of power use department computer, i.e. host computer carries out connected network communication, its connected network communication mode can be power carrier, cable transmission, optical cable transmission, far infrared transmit, be wirelessly transferred etc. mode directly with upper interconnection plane, form connected network communication network.Connected network communication mode can also pass through other communication systems, such as power load monitoring system, Automatic meter reading system etc. indirectly with upper interconnection plane, form connected network communication network.
The fault record data that state recording module 9 is provided by network communication module 11, by connected network communication network, communication protocol according to regulation, when metering current mulual inductor breaks down, send fault message to intra-office Surveillance center computer in time,, Rapid Alarm real-time to current transformer failure metering or anti-electricity-theft realization, transmit the various data records in state recording module 9 to host computer simultaneously, and host computer instruction can be received, arrange parameter in modification state recording module 9, and clock module 8 is entered with row clock check and correction.
Most preferred embodiment
What the present invention provided is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus，Its microprocessor can produce the square-wave signal of 30k-60k，Form the sine wave signal of standard after outside shaping circuit shaping，After amplifying through excitation amplifying circuit，Periodically metering secondary is scanned analyzing，Measurement loop is in no extraneous scanning signal and two kinds of different characteristic signals of generation when having scanning signal，Characteristic signal passes through computing and the coupling of self-adaptive processing algorithm，Calculate the Various types of data in metering secondary，Accurately judge whether secondary coil insulating properties reduce metering current mulual inductor、Turn-to-turn short circuit、Input and output terminal loose contact、Transformer ratio changes、And whether secondary output loop open a way and all kinds of faults or the stealing information such as short circuit，Record and show the beginning and ending time of fault or stealing、Fault type、Fault is separate.And can judge and process current mulual inductor malfunction or the stealing effective detection method of offer and detection means by the fault of communication network real-time Transmission metering current mulual inductor or stealing information for timely.
What the present invention provided is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, compared with existing metering current mulual inductor detection means, the detection means that this programme provides can detect to current transformer failure metering or anti-electricity-theft real-time online of realizing under the various methods of operation of high and low voltage electric distribution electrical network, the present invention has network communicating function, can real-time faults various in electric power meter be reported to the police.Can not only be used for the function expanding module of other correlation measurement instruments in electric energy metrical, also can be separately formed the failure detector of metering current mulual inductor；Can current transformer failure metering in the existing electric energy metrical of the effectively solving or accuracy in thief-proof electro-detection is low, real-time and poor reliability, do not enable the key issues such as on-line checking, can be widely applied to power system electric energy metrical and thief-proof electro-detection record.
Above-mentioned the specific embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any person skilled in the art all can carry out modifications and changes without prejudice under the spirit and the scope of the present invention to above-described embodiment.Therefore, those of ordinary skill in the art is completed under without departing from disclosed spirit and technological thought such as all equivalent modifications or change, must be covered by the claim of the present invention.
Claims (6)
1. a kind of it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, including high frequency pumping module, signal coupling module, signal sampling module, signal processing module, judge module, state output module and power module, it is characterized in that, also include a signal gain control module, for the sampled signal size according to signal sampling module feedback, automatically change excitation gain；Wherein,
Described high frequency pumping module, for producing high-frequency excitation signal, and provides high-frequency excitation signal by signal gain control module to signal coupling module, and provides reference signal to signal processing module simultaneously,
Described signal coupling module, high frequency pumping module and signal sampling module are connected to by signal gain control module, signal coupling module is used for isolating the weak electrical loop in the forceful electric power loop, the weak electrical loop of high frequency pumping module and signal sampling module of metering current mulual inductor, signal coupling module passes through signal gain control module by the forceful electric power loop of the high-frequency excitation signal coupling output of high frequency pumping module to metering current mulual inductor, and the high frequency feedback signal in the forceful electric power loop of metering current mulual inductor is coupled and signal sampling module；
Described signal sampling module, the high frequency feedback signal for forceful electric power loop in metering current mulual inductor that signal coupling module is provided carries out in real time formerly being exported a feedback signal extremely described signal processing module after signal sampling, amplifications, filtering and Shape correction；
Described signal processing module, it is connected to high frequency pumping module and signal sampling module, reference signal for providing high frequency pumping module carries out analog-to-digital conversion process and the feedback signal of signal sampling module offer is carried out analog digital conversion, digital filtering and fourier transform process, to obtain reference signal after treatment and feedback signal, and by reference signal after treatment and feedback signal output to described judge module；
Described judge module, it is connected to signal processing module, for accident analysis judgement carried out to reference signal after treatment and feedback signal, and the fault type belonging to determining accident analysis judged result as preset failure type, and export corresponding fault type indication signal；
Described state output module, is connected to described judge module, for receiving described fault type indication signal, and exports current transformer failure metering or anti-electricity-theft type according to preset standard data form and instead gives birth to separate accordingly；
Described power module, at least includes supply convertor, manostat and standby battery group, for providing working power for detection means, and is switched to power module by described supply convertor when breaking down and is powered using described standby battery group.
2. it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus it is characterised in that also including according to claim l:
For providing the clock module of current time；
State recording module, is connected to judge module and clock module, and beginning and ending time, fault type and generation for recording fault when fault occurs are separate.
3. according to claim 2 it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, it is characterized in that, also include a state display module, it is connected to described state recording module, beginning and ending time, fault type and generation for showing the described fault recorded in described state recording module are separate.
4. according to claim 3 it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, it is characterized in that, also include a network communication module, it is connected to described state recording module, for being recorded described state recording module according to preset standard communication protocol when instead giving birth to fault at least include beginning and ending time of fault, fault type and occurring the fault message including separate to be uploaded to Surveillance center.
5. it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus according to any one of claim 1-4, it is characterized in that, described signal gain control module includes the operational amplifier of model sa5534ad, wherein, the in-phase input end of described operational amplifier is connected to an end node being connected in parallel by electric capacity and first resistor, another end node that described electric capacity and first resistor are connected in parallel is connected to one end of second resistance, the other end of described second resistance is connected to the inverting input of described operational amplifier by 3rd resistor, it is connected in parallel to the suitable switches set being connected to signal coupling module end mutual voltage of multiple confessions between the inverting input of described operational amplifier and outfan, each described switches set is that have a resistance and analog switch to be connected in series.
6. according to claim 5 it is suitable to current transformer failure metering and anti-electricity-theft real-time detection apparatus, it is characterized in that, the resistance sizes that described switches set is at least included in first switch group, second switch group, the 3rd switches set and the 4th switches set, and described first switch group, second switch group, the 3rd switches set and the 4th switches set correspond to 20k, 51 k, 100 k and 200 k.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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