CN201935981U - Fault detector for electric distribution network - Google Patents
Fault detector for electric distribution network Download PDFInfo
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- CN201935981U CN201935981U CN2011200149836U CN201120014983U CN201935981U CN 201935981 U CN201935981 U CN 201935981U CN 2011200149836 U CN2011200149836 U CN 2011200149836U CN 201120014983 U CN201120014983 U CN 201120014983U CN 201935981 U CN201935981 U CN 201935981U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The utility model discloses a fault detector for an electric distribution network, which comprises a current transformer, a signal processing circuit, a low-pass filter, a frequency detection circuit, a band-pass filter, a microprocessor and an alarm module. The fault detector for the electric distribution network can be used for intelligently detecting the faults of the electric distribution network and prompting users to maintain in time, and can be accurately positioned; the stability and the reliability in work of the electric distribution network can be ensured; and the fault detector has low power consumption and strong anti-jamming capability.
Description
Technical field
The utility model relates to field of power, relates in particular to a kind of distribution network failure detecting device.
Background technology
China's power distribution network has frequent complicated, the feature such as maintenance workload is big of various changeable, the fault of line construction complexity, environment.Distribution line breaks down for a certain section, need investigate the fault occurrence positions piecemeal, and not only working strength is big, but also can incur loss through delay the repairing time, influences power supply reliability.
At present, some problems of fault detect ubiquity of some distribution lines are in particular in:
1, indication is simple: adopt technology such as simple board turning, flash of light, need manual inspection to carry out localization of fault, investigation efficient is low.
2, failure criterion is simple: adopt the hardware simulation circuit to do criterion, can not quantize, the single curing of criterion is difficult to accurate failure judgement.
3, self-checking function is incomplete: fail the ruuning situation of distribution line watch-dog is accomplished real-time self check and warning.
The utility model content
In view of above-mentioned existing in prior technology problem, the utility model provides a kind of distribution network failure detecting device, and fault judgement and accurate positioning can in time notify the user to safeguard when breaking down, and guarantees that the power distribution network working stability is reliable.
In order to reach above-mentioned technique effect, the utility model provides a kind of distribution network failure detecting device, comprising:
Be used to gather the current signal of power distribution network, and described current signal be processed into the current transformer of little current signal;
Be used for described little current signal is processed into the signal processing circuit of the AC signal of band DC component;
Be used for detecting the low-pass filter of current information of the AC signal of described band DC component;
Be used for detecting the frequency detection circuit of frequency information of the AC signal of described band DC component;
Be used for detecting the high-frequency information bandpass filter of the AC signal of described band DC component;
Microprocessor, described microprocessor comprises and is used for judging whether the electric current of described current information changes, if have then judge that described power distribution network breaks down, send the electric current judging unit of alarm signal, be used to calculate the number of times that described frequency information is passed through in the 4th time that sets in advance, when described number of times is not the value that sets in advance, judge that described power distribution network breaks down, send the frequency judging unit of alarm signal and be used to read described high-frequency information, when the described high-frequency information that reads increases, judge that then described power distribution network breaks down, send the high fdrequency component judging unit of alarm signal;
Be used to receive described alarm signal, and the alarm module of alarming.
As the utility model distribution network failure detecting device preferred implementation, described electric current judging unit comprises:
Be used for judging whether the electric current of described current information reduces,, judge described power distribution network generation open fault, send the first electric current judging unit of alarm signal to described alarm module when described electric current reduces and duration when being the very first time that sets in advance;
Be used for increasing and duration when being second time that sets in advance when the electric current of described current information, judge that whether described electric current is greater than the current value that sets in advance, when described electric current during, described current information is sent to the second electric current judging unit of described alarm module greater than the current value that sets in advance;
Be used for when described electric current does not recover in less than the current value that sets in advance and the 3rd time of setting in advance, then judging described power distribution network generation unsuccessful reclosing fault, send the three electric current judging unit of alarm signal to described alarm module.
As the utility model distribution network failure detecting device preferred implementation, described distribution network failure detecting device also comprises:
Be used for providing the power module of supply voltage to described distribution network failure detecting device;
Be used to detect the supply voltage of described distribution network failure detecting device, and testing result be sent to the low-voltage testing circuit of described microprocessor;
Be used for providing the clock circuit of accurate clock signal to described microprocessor.
As the utility model distribution network failure detecting device preferred implementation, described signal processing circuit comprises connection terminal J2, voltage dependent resistor (VDR) P1, Transient Suppression Diode D1, stabilivolt D3, resistance R 3, resistance R 4, resistance R 5, resistance R 10, capacitor C 1, capacitor C 2, the operational amplifier U1A and first power supply, the input end of described J2 is connected with described current transformer, the output terminal of described J2 is through described P1 ground connection, the output terminal of described J2 is through described D1 ground connection, the output terminal of described J2 is through described D3 ground connection, the output terminal of described J2 is through described R3 ground connection, the output terminal of described J2 inserts the inverting input of described U1A through described C2, described R4 one end is connected with the in-phase input end of described U1A, the described R4 other end is connected with described power supply, the described R4 other end also passes through described C1 ground connection, the positive power source terminal of described U1A is connected with described first power supply, the negative power end ground connection of described U1A, the in-phase input end of described U1A is through described R5 ground connection, and the inverting input of described U1A is connected with the output terminal of described U1A through described R10.
As the utility model distribution network failure detecting device preferred implementation, described low-pass filter comprises resistance R 13, resistance R 14, resistance R 6, resistance R 11, resistance R 19, capacitor C 6, capacitor C 7 and operational amplifier U1C, described R13 one end is connected with the output terminal of described U1A, the described R13 other end is connected with described R14 one end, the described R13 other end is connected with described U1C output terminal through C7, the described R14 other end is connected with the in-phase input end of described U1C, the described R14 other end is through described C6 ground connection, the inverting input of described U1C is through described R6 ground connection, the inverting input of described U1C is connected with the output terminal of described U1C through described R11, and the output terminal of described U1C is connected with described R19.
As the utility model distribution network failure detecting device preferred implementation, described frequency detection circuit comprises capacitor C 13, resistance R 7, resistance R 8, resistance R 25, operational amplifier U1D and second source, described capacitor C 13 1 ends are connected with the output terminal of described U1A, the described C13 other end is connected with the inverting input of described U1D, the in-phase input end of described U1D is connected with described second source through described R7, the in-phase input end of described U1D is through described R8 ground connection, and the output terminal of described U1D is connected with described R25.
As the utility model distribution network failure detecting device preferred implementation, described bandpass filter comprises resistance R 15, resistance R 1, resistance R 2, resistance R 17, resistance R 18, resistance R 20, capacitor C 4, capacitor C 5, operational amplifier U1B and the 3rd power supply, described R15 one end is connected with the output terminal of described U1A, the described R15 other end is through described R17 ground connection, the described R15 other end is connected with described C4 one end, the described R15 other end is connected with the output terminal of described U1B through described C5, the described C4 other end is connected with the inverting input of described U1B, the described C4 other end is connected with the output terminal of described U1B through described R18, the in-phase input end of described U1B is through described R1 ground connection, the in-phase input end of described U1B is connected with described the 3rd power supply through described R2, and the output terminal of described U1B is connected with described R20.
As the utility model distribution network failure detecting device preferred implementation, described low-voltage testing circuit comprises resistance R 28, resistance R 9, resistance R 12, resistance R 16, resistance R 27, resistance R 29, field effect transistor Q1, field effect transistor Q2 and the 4th power supply, described R28 one end is connected with described microprocessor, the described R28 other end is connected with the grid of described Q2, the described R28 other end is through described R9 ground connection, the source ground of described Q2, the drain electrode of described Q2 is connected with described R12 one end, the described R12 other end is connected with the grid of described Q1, the grid of described Q1 is connected with described the 4th power supply through described R27, the source electrode of described Q1 is connected with described the 4th power supply, the drain electrode of described Q1 is connected with described R29 one end, the described R29 other end is through described R15 ground connection, and the described R29 other end is also as the output terminal of described low-voltage testing circuit.
As the utility model distribution network failure detecting device preferred implementation, described clock circuit comprises C10, C11 and crystal oscillator Y1, described C10 one end is connected with input end, described C10 other end ground connection, described Y1 one end is connected with input end, the described Y1 other end is through described C11 ground connection, and the described Y1 other end is also as the output terminal of described clock circuit.
Implement the utility model distribution network failure detecting device, has following beneficial effect: by the current transformer in the distribution network failure detecting device, current detection module, frequency detection circuit and bandpass filter are gathered and are handled the current signal of power distribution network, and the information that collects is analyzed by microprocessor, whether can judge the power distribution network circuit breaks down, and point out the user by alarm module, in time notify the user to safeguard, reach the Intelligent Measurement effect, accurate positioning, guarantee that the power distribution network working stability is reliable, low in energy consumption, antijamming capability is strong.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, will do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below.Obviously, the accompanying drawing in describing below only is embodiment more of the present utility model; For those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model distribution network failure detecting device first embodiment;
Fig. 2 is the signal processing circuit synoptic diagram;
Fig. 3 is the low-pass filter circuit synoptic diagram;
Fig. 4 is the frequency detection circuit synoptic diagram;
Fig. 5 is the band pass filter circuit synoptic diagram;
Fig. 6 is the low-voltage testing circuit synoptic diagram;
Fig. 7 is the clock circuit synoptic diagram.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is carried out clear, complete description.Obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the utility model is protected.
Referring to Fig. 1, Fig. 1 is the structural representation of an embodiment of the utility model distribution network failure detecting device.This distribution network failure detecting device comprises current transformer 101, signal processing circuit 102, low-pass filter 103, frequency detection circuit 104, bandpass filter 105, microprocessor 106 and alarm module 107,
Concrete, current transformer 101 is made up of the current transformer that employing has high magnetic property, because the current ratio of the power distribution network that collects is bigger, cause directly to gather big current signal, so must big current signal be processed into little current signal by current transformer 101, make output amplitude and power distribution network proportional in line current, output frequency equates with the online power frequency of power distribution network.
Concrete, because the little current signal of current transformer 101 outputs is positive and negative AC signal that replace, distribution network failure detecting device 1 can't be gathered the negative current waveform signal, so need signal processing circuit 1021 the positive and negative AC signal that replaces (being little current signal) to be processed into the AC signal of band DC component, these signal processing circuit 102 circuit diagrams as shown in Figure 2, this signal processing circuit 102 comprises connection terminal J2, voltage dependent resistor (VDR) P1, Transient Suppression Diode D1, stabilivolt D3, resistance R 3, resistance R 4, resistance R 5, resistance R 10, capacitor C 1, capacitor C 2, the operational amplifier U1A and first power supply, the input end of described J2 is connected with described current transformer, the output terminal of described J2 is through described P1 ground connection, the output terminal of J2 is through D1 ground connection, the output terminal of J2 is through D3 ground connection, the output terminal of J2 is through R3 ground connection, the output terminal of J2 inserts the inverting input of U1A through C2, R4 one end is connected with the in-phase input end of U1A, the R4 other end is connected with power supply, the R4 other end also passes through C1 ground connection, the positive power source terminal of U1A is connected with first power supply, the negative power end ground connection of U1A, the in-phase input end of U1A is through R5 ground connection, and the inverting input of U1A is connected with the output terminal of described U1A through R10.The little current signal of current transformer 101 outputs inserts from the J2 port; after the C2 coupling, input to operational amplifier; operational amplifier is on the complete basis of holding signal; both improved input resistance; reduce the load of current transformer 101; reduced output resistance again; increase the driving force of circuit; make input and output impedance phase coupling; improve the resolution characteristic of subsequent conditioning circuit to signal; and P1 voltage dependent resistor (VDR); the D1 transient voltage suppresses diode; the D3 stabilivolt has played good protective action to the operational amplifier input end, and the AC signal of band DC component is after treatment exported from operational amplifier 1 pin output terminal.
Low-pass filter 103 is used for detecting the current information of the AC signal of being with DC component, and is sent to microprocessor 106;
Concrete, the circuit diagram of low-pass filter 1022 as shown in Figure 3, this low-pass filter comprises resistance R 13, resistance R 14, resistance R 6, resistance R 11, resistance R 19, capacitor C 6, capacitor C 7 and operational amplifier U1C, R13 one end is connected with the output terminal of U1A, the R13 other end is connected with R14 one end, the R13 other end is connected with the U1C output terminal through C7, the R14 other end is connected with the in-phase input end of U1C, the R14 other end is through C6 ground connection, the inverting input of U1C is through R6 ground connection, the inverting input of U1C is connected with the output terminal of U1C through R11, and the output terminal of U1C is connected with R19.The AC signal of band DC component inputs to the active second-order low-pass filter of being made up of amplifier from R13, filter in the power distribution network owing to the high fdrequency component that various load produced is only handled the steady-state component of low frequency, obtain the current information in the power distribution network, be sent to then in the microprocessor 106.
Concrete, because near the high-intensity magnetic field the hi-line can produce interference, thereby cause the distortion of waveform, finally cause judging and make mistakes, so need solve this situation by a frequency detection circuit, this frequency detection circuit synoptic diagram as shown in Figure 4, this frequency detection circuit comprises capacitor C 13, resistance R 7, resistance R 8, resistance R 25, operational amplifier U1D and second source, capacitor C 13 1 ends are connected with the output terminal of U1A, the C13 other end is connected with the inverting input of U1D, the in-phase input end of U1D is connected with second source through R7, and the in-phase input end of U1D is through R8 ground connection, and the output terminal of U1D is connected with R25.The operation amplifier circuit that utilization is made up of amplifier carries out wave shaping to the AC signal of band DC component, and the sine wave shaped of its variation is become square wave, inputs to then in the microprocessor 106.
Concrete, cause can exist 5 more subharmonic and 7 order harmonic components when being short-circuited ground connection and small current neutral grounding, this provides foundation for failure judgment, therefore, utilize in the band pass filter circuit as shown in Figure 5 the component of signal of forming by amplifier within the frequency band 500Hz-1500Hz of qualification that allows pass through, and the resonant circuit that the component of signal outside this frequency band suppresses is greatly extracted it, this bandpass filter comprises resistance R 15, resistance R 1, resistance R 2, resistance R 17, resistance R 18, resistance R 20, capacitor C 4, capacitor C 5, operational amplifier U1B and the 3rd power supply, R15 one end is connected with the output terminal of U1A, the R15 other end is through R17 ground connection, the R15 other end is connected with C4 one end, the R15 other end is connected with the output terminal of U1B through C5, the C4 other end is connected with the inverting input of U1B, the C4 other end is connected with the output terminal of U1B through R18, the in-phase input end of U1B is through R1 ground connection, the in-phase input end of U1B is connected with the 3rd power supply through R2, and the output terminal of U1B is connected with R20.Its principle of work is: when the power distribution network circuit normally moves, because the power distribution network line frequency is 50Hz, can't satisfy the bandpass filter condition, bandpass filter no signal output this moment; Can have 5 more subharmonic and 7 order harmonic components when being short-circuited ground connection and small current neutral grounding, the harmonic wave size is generally 500Hz-1500Hz, just satisfies the bandpass filter output condition.This bandpass filter 105 has higher Q value, can suppress the signal in the stopband well, therefore, can be intactly, without distortion harmonic component is extracted.
Electric current judging unit 1061 is used for judging whether the electric current of current information changes, if having then judge that power distribution network breaks down, sends alarm signal to alarm module 107;
Concrete, electric current judging unit 1061 comprises:
The first electric current judging unit 10611 is used for judging whether the electric current of current information reduces, when electric current reduces and duration when being the very first time that sets in advance, judge power distribution network generation open fault, send alarm signal to alarm module 107, concrete, the very first time is 2 seconds;
The second electric current judging unit 10612, be used for increasing and duration when being second time that sets in advance when the electric current of current information, judge that whether electric current is greater than the current value that sets in advance, when electric current during greater than the current value that sets in advance, current information is sent to alarm module 107, concrete, second time was 20 milliseconds, the current value that sets in advance is 5A;
The 3rd electric current judging unit 10613, when electric current does not recover in less than the current value that sets in advance and the 3rd time of setting in advance, then judge power distribution network generation unsuccessful reclosing fault, send alarm signal to alarm module 107, concrete, the 3rd time was 50 milliseconds, if electric current recovers just often less than the current value that sets in advance and in the 3rd time that sets in advance, then can judge the success of quick-break reclosing, not need to restart phase current sudden change criterion this moment.
Concrete, the 4th time was 1.66 milliseconds, 106 pairs of square waves of microprocessor carry out negative edge to interrupt, during with 1.66 millisecond meters, by calculating 1.66 milliseconds number of times, obtain the one-period time, because the normal phase power frequency is 50 Hz, count value should be 12 in the timing window interrupting, if count value is not 12, show that then frequency is undesired, departed from 50 Hz, judge that power distribution network breaks down, alarm signal takes place to alarm module 107.
High fdrequency component judging unit 1063 is used to read high-frequency information, when the high-frequency information that reads increases, judges that then power distribution network breaks down, and sends alarm signal to alarm module 107;
Concrete, high fdrequency component judging unit 1063 ripple weekly reads 12 times, if these data that read increase 10A than the data that read last time is, and then thinking has transient state to take place, and sends alarm signal to alarm module 107.
Concrete, when alarm module 107 receives alarm signal, to alarm, fault has taken place in prompting user power distribution network.
Need to prove that distribution network failure detecting device 1 also comprises:
Low-voltage testing circuit 109 is used to detect the supply voltage of distribution network failure detecting device, and testing result is sent to microprocessor 106;
Concrete, this low-voltage testing circuit synoptic diagram as shown in Figure 6, this low-voltage testing circuit 109 comprises resistance R 28, resistance R 9, resistance R 12, resistance R 16, resistance R 27, resistance R 29, field effect transistor Q1, field effect transistor Q2 and the 4th power supply, R28 one end is connected with microprocessor 106, the R28 other end is connected with the grid of Q2, the R28 other end is through R9 ground connection, the source ground of Q2, the drain electrode of Q2 is connected with R12 one end, the R12 other end is connected with the grid of Q1, the grid of Q1 is connected with the 4th power supply through R27, the source electrode of Q1 is connected with the 4th power supply, the drain electrode of Q1 is connected with R29 one end, and the R29 other end is through R15 ground connection, and the R29 other end is also as the output terminal of low-voltage testing circuit.Utilize 12 ADC functions of microprocessor 106, cell voltage is inputed to the ADC conversion pin of microprocessor 106 with the form of electric resistance partial pressure, and microprocessor 106 utilizes the ADC conversion that the voltage signal that collects is calculated current cell voltage by the intrinsic standoff ratio of R29 and R15:
Cell voltage=detection ADC voltage/(R15/(R15+R29))
Judge with default low voltage voltage according to cell voltage again, then be battery low pressure when cell voltage is lower than predeterminated voltage; When cell voltage is higher than predeterminated voltage then is normal voltage.Q1 and Q2 form an on-off circuit, open on-off circuit when microprocessor 106 needs to gather, and gather and finish the off switch circuit, guarantee the circuit low power operation.
Concrete, this clock circuit synoptic diagram as shown in Figure 7, this clock circuit 110 comprises C10, C11 and crystal oscillator Y1, C10 one end is connected with input end, C10 other end ground connection, Y1 one end is connected with input end, and the Y1 other end is through C11 ground connection, and the Y1 other end is also as the output terminal of clock circuit.This clock circuit 110 is the standard time clock circuit of being made up of a crystal oscillator, for microprocessor 106 provides the 16M clock signal of a standard, has guaranteed the accuracy of data acquisition.
In sum, the utility model distribution network failure detecting device, by the current transformer in the distribution network failure detecting device, current detection module, frequency detection circuit and bandpass filter the current signal of power distribution network is gathered and handled, and the information that collects is analyzed by microprocessor, whether can judge the power distribution network circuit breaks down, and point out the user by alarm module, in time notify the user to safeguard, reach the Intelligent Measurement effect, accurate positioning, guarantee that the power distribution network working stability is reliable, low in energy consumption, antijamming capability is strong.
More than disclosed only be several preferred embodiments of the utility model, can not limit the interest field of the utility model certainly with this.Therefore, the equivalent variations according to the utility model claim is done still belongs to the scope that the utility model is contained.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from technical scope of the present utility model and distribution network failure detector arrangement.Like this, if of the present utility model these are revised and modification belongs within the utility model claim and equivalent technologies scope and the distribution network failure detector arrangement, then the utility model also is intended to comprise these changes and modification interior.
Claims (9)
1. a distribution network failure detecting device is characterized in that, comprising:
Be used to gather the current signal of power distribution network, and described current signal be processed into the current transformer of little current signal;
Be used for described little current signal is processed into the signal processing circuit of the AC signal of band DC component;
Be used for detecting the low-pass filter of current information of the AC signal of described band DC component;
Be used for detecting the frequency detection circuit of frequency information of the AC signal of described band DC component;
Be used for detecting the high-frequency information bandpass filter of the AC signal of described band DC component;
Microprocessor, described microprocessor comprises and is used for judging whether the electric current of described current information changes, if have then judge that described power distribution network breaks down, send the electric current judging unit of alarm signal, be used to calculate the number of times that described frequency information is passed through in the 4th time that sets in advance, when described number of times is not the value that sets in advance, judge that described power distribution network breaks down, send the frequency judging unit of alarm signal and be used to read described high-frequency information, when the described high-frequency information that reads increases, judge that then described power distribution network breaks down, send the high fdrequency component judging unit of alarm signal;
Be used to receive described alarm signal, and the alarm module of alarming.
2. distribution network failure detecting device as claimed in claim 1 is characterized in that, described electric current judging unit comprises:
Be used for judging whether the electric current of described current information reduces,, judge described power distribution network generation open fault, send the first electric current judging unit of alarm signal to described alarm module when described electric current reduces and duration when being the very first time that sets in advance;
Be used for increasing and duration when being second time that sets in advance when the electric current of described current information, judge that whether described electric current is greater than the current value that sets in advance, when described electric current during, described current information is sent to the second electric current judging unit of described alarm module greater than the current value that sets in advance;
Be used for when described electric current does not recover in less than the current value that sets in advance and the 3rd time of setting in advance, then judging described power distribution network generation unsuccessful reclosing fault, send the three electric current judging unit of alarm signal to described alarm module.
3. distribution network failure detecting device as claimed in claim 2 is characterized in that, described distribution network failure detecting device also comprises:
Be used for providing the power module of supply voltage to described distribution network failure detecting device;
Be used to detect the supply voltage of described distribution network failure detecting device, and testing result be sent to the low-voltage testing circuit of described microprocessor;
Be used for providing the clock circuit of accurate clock signal to described microprocessor.
4. as each described distribution network failure detecting device of claim 1 to 3, it is characterized in that, described signal processing circuit comprises connection terminal J2, voltage dependent resistor (VDR) P1, Transient Suppression Diode D1, stabilivolt D3, resistance R 3, resistance R 4, resistance R 5, resistance R 10, capacitor C 1, capacitor C 2, the operational amplifier U1A and first power supply, the input end of described J2 is connected with described current transformer, the output terminal of described J2 is through described P1 ground connection, the output terminal of described J2 is through described D1 ground connection, the output terminal of described J2 is through described D3 ground connection, the output terminal of described J2 is through described R3 ground connection, the output terminal of described J2 inserts the inverting input of described U1A through described C2, described R4 one end is connected with the in-phase input end of described U1A, the described R4 other end is connected with described power supply, the described R4 other end also passes through described C1 ground connection, the positive power source terminal of described U1A is connected with described first power supply, the negative power end ground connection of described U1A, the in-phase input end of described U1A is through described R5 ground connection, and the inverting input of described U1A is connected with the output terminal of described U1A through described R10.
5. distribution network failure detecting device as claimed in claim 4, it is characterized in that, described low-pass filter comprises resistance R 13, resistance R 14, resistance R 6, resistance R 11, resistance R 19, capacitor C 6, capacitor C 7 and operational amplifier U1C, described R13 one end is connected with the output terminal of described U1A, the described R13 other end is connected with described R14 one end, the described R13 other end is connected with described U1C output terminal through C7, the described R14 other end is connected with the in-phase input end of described U1C, the described R14 other end is through described C6 ground connection, the inverting input of described U1C is through described R6 ground connection, the inverting input of described U1C is connected with the output terminal of described U1C through described R11, and the output terminal of described U1C is connected with described R19.
6. distribution network failure detecting device as claimed in claim 4, it is characterized in that, described frequency detection circuit comprises capacitor C 13, resistance R 7, resistance R 8, resistance R 25, operational amplifier U1D and second source, described capacitor C 13 1 ends are connected with the output terminal of described U1A, the described C13 other end is connected with the inverting input of described U1D, the in-phase input end of described U1D is connected with described second source through described R7, the in-phase input end of described U1D is through described R8 ground connection, and the output terminal of described U1D is connected with described R25.
7. distribution network failure detecting device as claimed in claim 4, it is characterized in that, described bandpass filter comprises resistance R 15, resistance R 1, resistance R 2, resistance R 17, resistance R 18, resistance R 20, capacitor C 4, capacitor C 5, operational amplifier U1B and the 3rd power supply, described R15 one end is connected with the output terminal of described U1A, the described R15 other end is through described R17 ground connection, the described R15 other end is connected with described C4 one end, the described R15 other end is connected with the output terminal of described U1B through described C5, the described C4 other end is connected with the inverting input of described U1B, the described C4 other end is connected with the output terminal of described U1B through described R18, the in-phase input end of described U1B is through described R1 ground connection, the in-phase input end of described U1B is connected with described the 3rd power supply through described R2, and the output terminal of described U1B is connected with described R20.
8. distribution network failure detecting device as claimed in claim 3, it is characterized in that, described low-voltage testing circuit comprises resistance R 28, resistance R 9, resistance R 12, resistance R 16, resistance R 27, resistance R 29, field effect transistor Q1, field effect transistor Q2 and the 4th power supply, described R28 one end is connected with described microprocessor, the described R28 other end is connected with the grid of described Q2, the described R28 other end is through described R9 ground connection, the source ground of described Q2, the drain electrode of described Q2 is connected with described R12 one end, the described R12 other end is connected with the grid of described Q1, the grid of described Q1 is connected with described the 4th power supply through described R27, the source electrode of described Q1 is connected with described the 4th power supply, the drain electrode of described Q1 is connected with described R29 one end, and the described R29 other end is through described R15 ground connection, and the described R29 other end is also as the output terminal of described low-voltage testing circuit.
9. distribution network failure detecting device as claimed in claim 3, it is characterized in that, described clock circuit comprises C10, C11 and crystal oscillator Y1, described C10 one end is connected with input end, described C10 other end ground connection, described Y1 one end is connected with input end, and the described Y1 other end is through described C11 ground connection, and the described Y1 other end is also as the output terminal of described clock circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200149836U CN201935981U (en) | 2011-01-18 | 2011-01-18 | Fault detector for electric distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200149836U CN201935981U (en) | 2011-01-18 | 2011-01-18 | Fault detector for electric distribution network |
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| Publication Number | Publication Date |
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| CN201935981U true CN201935981U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200149836U Expired - Lifetime CN201935981U (en) | 2011-01-18 | 2011-01-18 | Fault detector for electric distribution network |
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| Country | Link |
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| CN (1) | CN201935981U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967778A (en) * | 2012-11-09 | 2013-03-13 | 北京天源科创风电技术有限责任公司 | Device and method for detecting power grid |
| CN109375053A (en) * | 2018-09-10 | 2019-02-22 | 湖南万护科技发展有限公司 | A kind of smart grid detection system |
| CN109617235A (en) * | 2018-12-14 | 2019-04-12 | 上海君世电气科技有限公司 | A kind of Little Current Ground Connection System of frequency-tracking and dynamic arrangements |
-
2011
- 2011-01-18 CN CN2011200149836U patent/CN201935981U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967778A (en) * | 2012-11-09 | 2013-03-13 | 北京天源科创风电技术有限责任公司 | Device and method for detecting power grid |
| CN102967778B (en) * | 2012-11-09 | 2016-05-11 | 北京天源科创风电技术有限责任公司 | A kind of electrical network checkout gear and detection method thereof |
| CN109375053A (en) * | 2018-09-10 | 2019-02-22 | 湖南万护科技发展有限公司 | A kind of smart grid detection system |
| CN109617235A (en) * | 2018-12-14 | 2019-04-12 | 上海君世电气科技有限公司 | A kind of Little Current Ground Connection System of frequency-tracking and dynamic arrangements |
| CN109617235B (en) * | 2018-12-14 | 2020-12-25 | 上海君世电气科技有限公司 | Low-current grounding line selection system with frequency tracking and dynamic arrangement |
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