CN103472356A - Cable type fault detector - Google Patents
Cable type fault detector Download PDFInfo
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- CN103472356A CN103472356A CN2013104726427A CN201310472642A CN103472356A CN 103472356 A CN103472356 A CN 103472356A CN 2013104726427 A CN2013104726427 A CN 2013104726427A CN 201310472642 A CN201310472642 A CN 201310472642A CN 103472356 A CN103472356 A CN 103472356A
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Abstract
The invention discloses a cable type fault detector. The cable type fault detector comprises a short-circuit fault indicator and a zero-sequence current mutual inductor. The short-circuit fault indicator comprises a power-taking current mutual inductor, a measuring current mutual inductor, a CT (Captive Test) power supply circuit, a phase current measuring circuit, a wireless communication module, an MCU (Microprogrammed Control Unit) and a zero-sequence current measuring circuit, wherein the power-taking current mutual inductor is connected with the power supply end of the MCU by virtue of the CT power supply circuit; the measuring current mutual inductor is connected with an I/O (Input/Output) port of the MCU by virtue of the phase current measuring circuit, and used for transmitting a detected phase current transmitting signal to the MCU; the zero-sequence current mutual inductor is connected with the A/D (Analog to Digital) sampling port of the MCU by virtue of the zero-sequence current measuring circuit, and used for transmitting a detected current transmitting signal to the MCU; the serial interface of the wireless communication module is connected with the I/O port of the MCU by virtue of an SPI (Single Program Initiation) bus. The cable type fault detector disclosed by the invention adopts a structural form with a plurality of current mutual inductors to carry out short-circuit and grounding fault detection, thereby effectively improving the current measuring precision and lowering the equipment start-up current.
Description
Technical field
The present invention relates to a kind of fault locator, particularly a kind of cable-type fault locator.
Background technology
In electrical power distribution automatization system, it is a very important function that localization of fault detects.Along with socioeconomic development, cable-type distribution line load and radius of electricity supply constantly increase, and branched line is on the increase, and the structure of circuit becomes increasingly complex, and cause line failure rate to raise, and fault is made an inventory and to investigate difficulty large.How line failure rate being dropped to minimumly, and will minimize troubleshooting time, is one of important content of Electric Power Service in High.
Traditional cable type distribution line failure detects at present, display device for short circuit generally adopts single mutual inductor structure, zero sequence current mutual inductor does not access display device for short circuit, measure and adopt disposable lithium cell as primary power, the general plastic optical fiber that adopts of communication, as medium, is presented at failure message on panel display.This fault detector can adapt to the certain applications demand, but still has more problem.
1. adopt the fault detector of single current transformer structure, induction power supply and measuring circuit share a mutual inductor, and larger on the measuring accuracy impact, fault accuracy of judgement degree is not high, and the load current measuring error is large.
2. zero sequence current mutual inductor does not access display device for short circuit, measures and adopts disposable lithium cell as primary power, and electric quantity of lithium battery is limited, and service life of equipment is short.
3. the communication mode of fault detector by plastic optical fiber be fault information reporting, plastic optical fiber field wiring difficulty, and reliability is low, is difficult to apply in batches.
Summary of the invention
The cable-type fault locator that the purpose of this invention is to provide the little and long service life of a kind of measuring error.
This cable-type fault locator provided by the invention, comprise display device for short circuit, zero sequence current mutual inductor and lithium battery, display device for short circuit comprises the power taking current transformer, measures current transformer, CT feed circuit, current phasor measurement circuit, wireless communication module, MCU and zero sequence current measurement circuit; The power taking current transformer is connected with the power end of MCU by the CT feed circuit; Measure current transformer and be connected with the I/O port of MCU by the current phasor measurement circuit, become for the phase current by detection the number of delivering letters and reach MCU; Zero sequence current mutual inductor is connected with the A/D sample port of MCU by the zero sequence current measurement circuit, becomes for the electric current by detection the number of delivering letters and reaches MCU; Lithium battery is connected with the power end of MCU by the CT feed circuit; The serial line interface of wireless communication module is connected with the I/O port of MCU by spi bus, for communication terminal, carrying out information interaction.
Described display device for short circuit is arranged on power distribution network A phase, B phase, C phase circuit.Described zero sequence current mutual inductor is arranged on the meet of A phase, B phase, C phase circuit.
Described CT feed circuit comprise rectifying protective circuit, direct current 5V power circuit, power supply CT connector and battery connector; Described power taking current transformer is connected with the input end of rectifying protective circuit by power supply CT connector, and the output terminal of this rectifying protective circuit is connected with the input end of direct current 5V power circuit; Described lithium battery is connected with the input end of this direct current 5V power circuit via the electrical source exchange diode by the battery connector again; The output terminal of this direct current 5V power circuit is connected with the power end of described MCU.
Described phase current testing circuit comprises signal conditioning circuit 1, A/D sample circuit 1 and measures the CT connector; Described measurement current transformer is connected with the input end of signal conditioning circuit 1 by measuring the CT connector, and the output terminal of this signal conditioning circuit 1 is connected with the input end of A/D sample circuit 1, and the output terminal of A/D sample circuit 1 is connected with the IO port of described MCU.
Described zero sequence current measurement circuit comprises signal conditioning circuit 2, A/D sample circuit 2 and zero sequence CT connector; Described zero sequence current mutual inductor is connected with the input end of signal conditioning circuit 2 by described connector, and the output terminal of this signal conditioning circuit 2 is connected with the input end of A/D sample circuit 2, and the output terminal of this A/D sample circuit 2 is connected with the AD sample port of described MCU.
Described wireless communication module communicates by GPRS or optical-fibre channel and main website via communication terminal, for failure message is sent to main website, completes localization of fault and alarm.
Described direct current 5V power circuit comprises the three-terminal voltage-stabilizing module.Described A/D sample circuit comprises the difference type A/D converter.
The present invention has adopted the version of multiple current mutual inductor, carries out short circuit and Earth Fault Detection in the cable-type distribution line, has effectively improved the current measurement precision, has reduced the device start electric current.
Compared with prior art, the beneficial effect that the present invention brings is as follows.
1. the built-in double-current mutual inductor of the present invention, the fault measuring error is little, and the fault judging nicety rate is high.
2. the present invention can external zero sequence current mutual inductor, thereby has extended service life of equipment, has non-maintaining function.
3. the present invention adopts the micro power radio communication mode, has on-the-spot the installation simply, the reliability high.
The accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is CT power supply circuit of the present invention.
Fig. 3 is current phasor measurement circuit diagram of the present invention.
Fig. 4 is zero sequence current measurement circuit diagram of the present invention.
Fig. 5 is MCU circuit diagram of the present invention.
Embodiment
The medium-voltage distribution circuit generally adopts the phase three-wire three structure, and the present invention, by A, B, C three-phase current and zero-sequence current being adopted and analyzing, calculates short circuit and ground signalling.
The present invention includes display device for short circuit and zero sequence current mutual inductor; Display device for short circuit is arranged on power distribution network A phase, B phase, C phase circuit.Zero sequence current mutual inductor is arranged on the meet of A phase, B phase, C phase circuit.
Inner integrated two current transformers of display device for short circuit, a current transformer (power taking current transformer) is for the invention provides induction power supply; Another current transformer (measurement current transformer) becomes for the invention provides phase current the number of delivering letters, and for short trouble, calculates with load current and measures.
Power taking current transformer output induction current, after carrying out rectification and protect induction current, for system provides the 5V direct supply.The present invention also adopts lithium battery power supply in support.Measure the current transformer output current and become the number of delivering letters, after the filtering protection, by the A/D change-over circuit, be converted into digital signal, MCU carries out computing and analysis to digital signal, calculates load current and short trouble information.Display device for short circuit also can be measured the change number of delivering letters from outside zero sequence current mutual inductor, for earth fault, calculates.
The present invention is specially adapted to current measurement precision, short circuit or Earth Fault Detection accuracy rate are required high, and the little cable-type fault detect site of deployment of device start current requirements.
As shown in Figure 1, the present invention includes display device for short circuit and zero sequence current mutual inductor.Display device for short circuit comprises the power taking current transformer, measures current transformer, CT feed circuit, current phasor measurement circuit, wireless communication module, MCU and zero sequence current measurement circuit.
The CT feed circuit comprise rectifying protective circuit, direct current 5V power circuit, power supply CT connector and battery connector.The phase current testing circuit comprises signal conditioning circuit 1, A/D sample circuit 1 and measures the CT connector.The zero sequence current measurement circuit comprises signal conditioning circuit 2, A/D sample circuit 2 and zero sequence CT connector.Direct current 5V power circuit comprises the three-terminal voltage-stabilizing module.A/D sample circuit 1 comprises A/D converter.
The power taking current transformer is connected with the input end of rectifying protective circuit by power supply CT connector, the output terminal of this rectifying protective circuit is connected with the input end of direct current 5V power circuit, and lithium battery is connected with the input end of this direct current 5V power circuit by the battery connector; The output terminal of this direct current 5V power circuit is connected with the power end of MCU, for to MCU, providing power supply.Measuring current transformer is connected with the input end of signal conditioning circuit 1 by measuring the CT connector, the output terminal of this signal conditioning circuit 1 is connected with the input end of A/D sample circuit 1, the output terminal of A/D sample circuit 1 is connected with the IO port of MCU, becomes for the phase current by detection the number of delivering letters and reaches MCU.Zero sequence current mutual inductor is connected with the input end of signal conditioning circuit 2 by described connector, and the output terminal of this signal conditioning circuit 2 is connected with the A/D sample port of MCU, becomes for the electric current by detection the number of delivering letters and reaches MCU.The serial line interface of wireless communication module is connected with the I/O port of MCU by spi bus, for main website, carrying out information interaction.
The CT feed circuit comprise rectifying protective circuit, direct current 5V power circuit, power supply CT connector XS1 and battery connector XS2.Rectifying protective circuit comprises filter capacitor C1, bridge rectifier circuit, first order overvoltage crowbar, second level overvoltage crowbar and storage capacitor C2.Direct current 5V power circuit comprises low-power dissipation power supply chip V5.Bridge rectifier circuit comprises diode V1, diode V3, diode V6 and diode V9.First order overvoltage crowbar comprises resistance R 1 and voltage stabilizing diode V7.Second level overvoltage crowbar comprises resistance R 2 and voltage stabilizing diode V8.
As shown in Figure 2 and Figure 5, the two ends that 1 pin of power supply CT connector XS1 and 2 pin meet respectively filter capacitor C1, one of filter capacitor C1 is terminated at the anode tap of diode V1, the other end of this electric capacity is connected to the cathode terminal of diode V9, the cathode terminal of diode V1 is connected with the anode tap of low forward voltage drop diode V2 by resistance R 1, and the cathode terminal of low forward voltage drop diode V2 is connected with 3 pin of power supply chip V5.Voltage stabilizing diode V7 is connected between 2 ends and ground of resistance R 1; Voltage stabilizing diode V8 is connected between 2 ends and ground of resistance R 2.The positive terminal of storage capacitor C2 is connected with 2 ends of resistance R 2, the negative pole end ground connection of this electric capacity.2 pin of battery connector XS2 are connected with 3 pin of power supply chip V5 by low forward voltage drop diode V4; 1 pin ground connection of this connector.2 pin of power supply chip V5 are connected with 16 pin of MCU, for transmitting power supply signal VMCU; This 2 pin is also by polar capacitor C3 ground connection.1 pin ground connection of this power supply chip; Its 3 pin is connected with terminals VIN, this 3 pin and MCU also by polar capacitor C4 ground connection.This low forward voltage drop diode V4 is the electrical source exchange diode.
The power supply signal that system power supply of the present invention adopts the power taking current transformer to obtain is as primary power, and lithium battery power supply is the structure of power supply in support.Power taking current transformer output induction current; by power supply CT connector XS1 access CT feed circuit; carry out the filtering processing via filter capacitor C1; again by after the bridge rectifier circuit rectification; enter successively first order overvoltage crowbar and second level overvoltage crowbar carries out the two-stage overvoltage protection; then after carrying out large capacitance energy storage, storage capacitor C2 obtains the CT power supply, for system provides the 5V power supply.This CT power supply obtained is connected with power supply chip V5 by low forward voltage drop diode V2, and while lithium battery power supply in support merges rear access power supply chip V5 by low forward voltage drop diode V4 and CT power supply.CT power supply and lithium battery can, without meeting switching, provide the stable working power of 3.3V by power supply chip V5 for system.
Commutator tube in bridge rectifier circuit is selected low forward commutator tube, can improve power supplying efficiency.It is the voltage stabilizing diode that 2W, burning voltage are 5V that voltage stabilizing diode V8 selects power.When a line current is less than the 2000A left and right, the output of power taking current transformer is less than 400mA; Second level overvoltage crowbar clamps the voltage at 5V by voltage stabilizing diode V8, and by 15 Europe resistance current limlitings.It is the voltage stabilizing diode that 2.5W, burning voltage are 11V that voltage stabilizing diode V7 selects power.When a line current surpasses 2000A, the output of power taking current transformer surpasses 400mA, and the voltage of voltage stabilizing diode V7 surpasses 11V, and voltage stabilizing diode V7 clamps the voltage at 11V.The present invention, by the two-stage overvoltage protection, can improve the ability of power supply Chinese People's Anti-Japanese Military and Political College rush of current.
The phase current testing circuit comprises signal conditioning circuit 1, A/D sample circuit 1 and measures the CT connector.Signal conditioning circuit comprises filter capacitor C6, static lightning strike protection pipe V10 and static lightning strike protection pipe V11.A/D sample circuit 1 comprises I/V translation circuit 1 and A/D converter U1.I/V translation circuit 1 comprises resistance R 4, resistance R 5, resistance R 6 and resistance R 7.
As shown in Figure 3 and Figure 5; measure 1 pin of CE connector and the two ends that 2 pin are connected to respectively filter capacitor C6; in parallel with this capacitor C 6 after static lightning strike protection pipe V10 and static lightning strike protection pipe V11 docking; 3 pin of this static lightning strike protection pipe V10 are connected with 2 pin of A/D converter U1 by resistance R 3, and the I/V translation circuit is connected between 1 pin of 1 pin of resistance R 3 and resistance R 8.2 pin of resistance R 3 are by capacitor C 5 ground connection.2 pin of resistance R 8 are by capacitor C 8 ground connection; This 2 pin also is connected with 3 pin of A/D converter U1.Capacitor C 7 is connected between 2 pin of 2 pin of resistance R 3 and resistance R 8.1 pin of A/D converter U1 is connected with 16 pin of MCU, and its 9 pin is connected with 7 pin of MCU, for the phase current that transmits the digital quantity that has converted voltage signal to, becomes the number of delivering letters to MCU; Its 10 pin is connected with 6 pin of MCU, for transmitting the clock signal of this A/D converter; After being connected with 8 pin, its 7 pin is connected with 8 pin of MCU, for receiving the chip chip selection signal from MCU; Its 4 pin, 6 pin and the equal ground connection of 11 pin.
Measure the current transformer output current and become the number of delivering letters; by measuring CT connector access phase current testing circuit; through filter capacitor C6 filtering; after being protected by static lightning strike protection pipe V10 and static lightning strike protection pipe V1 again; complete the I/V conversion by resistance R 4, resistance R 5, resistance R 6 and resistance R 7; the differential voltage signal obtained thus reaches MCU after being converted to digital signal by difference type A/D converter U1; by MCU, this digital signal is carried out to computing and analysis again, calculate load current and short trouble information.
The zero sequence current measurement circuit comprises signal conditioning circuit 2, A/D sample circuit 2 and zero sequence CT connector.Signal conditioning circuit 2 comprises filter capacitor C10, full-wave rectifying circuit and holding circuit.A/D sample circuit 2 comprises I/V translation circuit 2.Full-wave rectifying circuit comprises diode V12, diode V13, diode V14 and diode V16.Holding circuit comprises resistance R 9 and voltage stabilizing diode V15.I/V translation circuit 2 comprises resistance R 10 and resistance R 11.
As shown in Figure 4 and Figure 5,1 pin of zero sequence CT connector and 2 pin are connected to respectively the two ends of filter capacitor C10, and the end of filter capacitor C10 is connected with the cathode terminal of diode V13, and its other end is connected with the cathode terminal of diode V16.The anode tap of the anode tap of diode V12 and diode V14 all is connected with 1 pin of resistance R 9.2 pin of resistance R 9 are by voltage stabilizing diode V15 ground connection.Capacitor C 9 is connected between 2 pin and ground of resistance R 9.Resistance R 11 is connected between 2 pin and ground of resistance R 9.2 pin of resistance R 9 are connected with 18 pin of MCU by resistance R 10, the electric current change number of the delivering letters AD1 to MCU detected for transmitting zero sequence current mutual inductor.After capacitor C 11 and resistance R 12 parallel connections, be connected between 2 pin and ground of resistance R 10.
The zero sequence current mutual inductor output current becomes the number of delivering letters, by zero sequence CT connector access zero sequence current measurement circuit, after filter capacitor C10 filtering, carry out rectification by full-wave rectifying circuit, carry out signal protection by holding circuit again, then by the I/V translation circuit, signal is transformed to the unipolarity voltage signal; This unipolarity voltage signal reaches the A/D sampling pin of MCU, and MCU carries out this signal after A/D converts digital signal to, to complete earth fault and calculate.
The built-in micropower wireless communication module of the present invention, can be by short circuit and earth fault information, and load current uploads to main website by wireless communication mode.The built-in micropower wireless communication module of the present invention; The built-in GPRS module of communication terminal and micro power radio module.During on-the-spot the installation, do not need to install the communication link wiring between the present invention and communication terminal, but carry out point-to-point communication by its built-in wireless communication module, dielectric strength and safe, reliable communications, easy for installation.After the present invention detects short circuit or earth fault, by the micropower radio channel, failure message is sent to communication terminal, communication terminal is sent to main website by GPRS network or optical-fibre channel by failure message again, completes localization of fault and alarm.
When electric system normally moves, zero-sequence current is less, can't provide reliable source of power for sample circuit, and display device for short circuit of the present invention adopts double-current mutual inductor structure, and has independently power taking current transformer, can effectively address this problem.
Electric power system of the present invention has adopted the diode and the LDO that supplies power consumption for forward voltage drop, power supply power consumption can be reduced to 2uA, add the about 500uA of other circuit of system left and right working current, when primary side current is greater than 3A, power supply CT can be system provides stabilized power source, when primary side current is less than 3A, by lithium battery power supply.
The present invention, for detection of cable-type short circuit fault of power distribution network and earth fault, has than high measurement accuracy and the little characteristics of starting current.
Claims (9)
1. a cable-type fault locator, comprise display device for short circuit, zero sequence current mutual inductor and lithium battery, it is characterized in that, display device for short circuit comprises the power taking current transformer, measures current transformer, CT feed circuit, current phasor measurement circuit, wireless communication module, MCU and zero sequence current measurement circuit; The power taking current transformer is connected with the power end of MCU by the CT feed circuit; Measure current transformer and be connected with the I/O port of MCU by the current phasor measurement circuit, become for the phase current by detection the number of delivering letters and reach MCU; Zero sequence current mutual inductor is connected with the A/D sample port of MCU by the zero sequence current measurement circuit, becomes for the electric current by detection the number of delivering letters and reaches MCU; Lithium battery is connected with the power end of MCU by the CT feed circuit; The serial line interface of wireless communication module is connected with the I/O port of MCU by spi bus, for communication terminal, carrying out information interaction.
2. cable-type fault locator according to claim 1, is characterized in that, described display device for short circuit is arranged on power distribution network A phase, B phase, C phase circuit.
3. cable-type fault locator according to claim 1, is characterized in that, described zero sequence current mutual inductor is arranged on the meet of A phase, B phase, C phase circuit.
4. cable-type fault locator according to claim 1, is characterized in that, described CT feed circuit comprise rectifying protective circuit, direct current 5V power circuit, power supply CT connector and battery connector; Described power taking current transformer is connected with the input end of rectifying protective circuit by power supply CT connector, and the output terminal of this rectifying protective circuit is connected with the input end of direct current 5V power circuit; Described lithium battery is connected with the input end of this direct current 5V power circuit via the electrical source exchange diode by the battery connector again; The output terminal of this direct current 5V power circuit is connected with the power end of described MCU.
5. cable-type fault locator according to claim 1, is characterized in that, described phase current testing circuit comprises signal conditioning circuit 1, A/D sample circuit 1 and measures the CT connector; Described measurement current transformer is connected with the input end of signal conditioning circuit 1 by measuring the CT connector, and the output terminal of this signal conditioning circuit 1 is connected with the input end of A/D sample circuit 1, and the output terminal of A/D sample circuit 1 is connected with the IO port of described MCU.
6. cable-type fault locator according to claim 1, is characterized in that, described zero sequence current measurement circuit comprises signal conditioning circuit 2, A/D sample circuit 2 and zero sequence CT connector; Described zero sequence current mutual inductor is connected with the input end of signal conditioning circuit 2 by described connector, and the output terminal of this signal conditioning circuit 2 is connected with the input end of A/D sample circuit 2, and the output terminal of this A/D sample circuit 2 is connected with the AD sample port of described MCU.
7. cable-type fault locator according to claim 1, is characterized in that, described wireless communication module communicates by GPRS or optical-fibre channel and main website via communication terminal, for failure message is sent to main website, completes localization of fault and alarm.
8. cable-type fault locator according to claim 4, is characterized in that, described direct current 5V power circuit comprises the three-terminal voltage-stabilizing module.
9. cable-type fault locator according to claim 5, is characterized in that, described A/D sample circuit comprises the difference type A/D converter.
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| CN2013104726427A CN103472356A (en) | 2013-10-12 | 2013-10-12 | Cable type fault detector |
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| CN2013104726427A CN103472356A (en) | 2013-10-12 | 2013-10-12 | Cable type fault detector |
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Cited By (6)
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| CN104515932A (en) * | 2014-12-03 | 2015-04-15 | 许继电气股份有限公司 | Rapid line current fault detection method and rapid line current fault detection device |
| CN105116296A (en) * | 2015-10-12 | 2015-12-02 | 国家电网公司 | Special fault indicator for high-voltage power transmission network cable line |
| CN105527544A (en) * | 2016-02-17 | 2016-04-27 | 上海紫通信息科技有限公司 | Distribution line fault positioning device |
| CN109270395A (en) * | 2018-11-09 | 2019-01-25 | 中电装备山东电子有限公司 | A kind of fault detector electric current abrupt climatic change system and fault detector |
| CN112485600A (en) * | 2020-12-09 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | Distribution line fault path detection primary and secondary fusion sensor and sensor network |
| CN112748364A (en) * | 2020-12-24 | 2021-05-04 | 海南电网有限责任公司琼海供电局 | Hand-held type transmission line insulation detection device |
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| CN112748364A (en) * | 2020-12-24 | 2021-05-04 | 海南电网有限责任公司琼海供电局 | Hand-held type transmission line insulation detection device |
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Application publication date: 20131225 |