CN106093674B - Using the self-powered electric network fault detection device of short circuit current and method - Google Patents
Using the self-powered electric network fault detection device of short circuit current and method Download PDFInfo
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- CN106093674B CN106093674B CN201610378838.3A CN201610378838A CN106093674B CN 106093674 B CN106093674 B CN 106093674B CN 201610378838 A CN201610378838 A CN 201610378838A CN 106093674 B CN106093674 B CN 106093674B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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Abstract
The self-powered electric network fault detection device of short circuit current, including current transformer, rectification circuit, microprocessor, back discharge protection diode D1, positive discharge diode D2, DC voltage converting circuit, two-way switch and super capacitor are used the invention discloses a kind of；The cathode output end of rectification circuit is connected to by-pass switch, and the cathode output end of rectification circuit is connected to current detection circuit；The anode of positive discharge diode D2 is connect with the cathode of back discharge protection diode D1, and the anode of super capacitor is connect with two-way switch, and the cathode of positive discharge diode D2 is further connected with voltage detecting circuit；Wireless communication module is connected on microprocessor, the output of microprocessor is terminated with by-pass switch controlling and driving circuits and two-way switch controlling and driving circuits.The self-powered electric network fault detection method of short circuit current is used the invention also discloses a kind of.Circuit structure of the invention is simple, and the method and step of detection is simple, and intelligence degree is high, and functional reliability is high.
Description
Technical field
The invention belongs to electric network fault detection technique fields, and in particular to a kind of using the self-powered power grid event of short circuit current
Hinder detection device and method.
Background technique
Power system security, stabilization, reliable operation, have important economic significance to production and user power utilization, so having
Necessity carries out real-time monitoring and control to power grid, to improve the safety and reliability of its operation.When power network line appearance is short
When the failures such as road, open circuit, failure can be detected in time, and fault message is sent to control centre, notify service personnel, in time
Debugging restores operation power.Fault detection means is a kind of electric power facility, has extensive application in power grid auxiliary facility,
It detects line fault by senser element, cooperates signal processing module, realizes fault type judgement, utilizes wireless transport module
Fault message is sent to control centre, realize fault detection and is sent.Existing power circuit on-line measuring device is remote,
It is difficult to routinely method and solves the problems, such as power supply, the power supply applied to transmission line malfunction detection, generallys use the sun at present
Energy solar panel, voltage transformer take electricity, current transformer to take electricity, wind light mutual complementing, ground line induction etc. from power grid from power grid
Mode takes electricity, and the scheme for being equipped with batteries to store energy realizes detection device power supply.But solar panel work by weather, weather,
Geography etc. influences, and actual use has certain defect；Wind light mutual complementing scheme is suitble in the place of sunshine-duration length, wind-force abundance；It connects
Ground wire induction takes electricity to need to use on the transmission line of electricity that new laying or the design of electric network reconstruction have lightning-arrest overhead line；Mutual induction of voltage
Device and current transformer are directly mounted on transmission line of electricity, and application is more.
Electric network fault detection device has following methods at present: mode (1) cooperates battery to supply with solar panel
Electricity realizes fault detection with mutual inductor, realizes that short-range information is transmitted with ZigBee, fault-signal is sent under shaft tower
Box substation is sending a signal to control centre by the wireless device in case, is realizing that fault message is reported and submitted；Mode (2) uses electric current
Or voltage transformer directly takes electricity, cooperates lithium battery power supply, mutual inductor detects failure while taking energy, realizes short distance with ZigBee
From information transmission, fault message is sent to nearest transmission substation, higher level's terminal is being sent to by substation, is realizing failure letter
Breath is reported and submitted；Mode (3) Current Transformer or voltage transformer cooperation lithium battery or the energy supply of battery realization device, mutual inductor take
Failure is detected while energy, with gsm wireless module, fault message is directly remotely sent to control centre.For mode (1),
Whole device is divided into two parts, and volume is big, and solar panel is influenced by weather, geography, weather again, and power supply performance is unstable
It is fixed；The problem of equally existing mode (1) for mode (2), device is divided into two parts, and volume is big, and installation is complicated；For mode
(3), current transformer or voltage transformer cooperation battery or lithium battery realize power supply, and battery and service life of lithium battery are shorter,
And charge-discharge performance is influenced by temperature, weather, geography.
In conclusion electric network fault detection device in the prior art, which exists, centainly uses upper deficiency, it cannot be fine
Ground is met the actual needs.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of circuit structure
Simply, design is rationally, intelligence degree is high, functional reliability is high, practical, and using effect is good, adopting convenient for popularization and use
With the self-powered electric network fault detection device of short circuit current.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: it is a kind of to use the self-powered electricity of short circuit current
Net fault detection means, it is characterised in that: including for taking the electric current of electricity from power network line when short circuit occurs in power network line
Mutual inductor and the rectification circuit being connect with the output end of current transformer and microprocessor, back discharge protection diode D1,
Positive discharge diode D2, DC voltage converting circuit, two-way switch and super capacitor；The cathode output end of the rectification circuit
It is connected to by-pass switch, the cathode output end of the rectification circuit is connected to carry out in real time for the electric current to Current Transformer Secondary side
The current detection circuit of detection, the current detection circuit are connect with by-pass switch；The back discharge protection diode D1's
The connection of the cathode output end and by-pass switch of anode and rectification circuit, the anode and two-way switch of the forward direction discharge diode D2
It is connect with the cathode of back discharge protection diode D1, the anode of the super capacitor is connect with two-way switch, described super
The cathode of capacitor is grounded, and the input terminal of the DC voltage converting circuit is connect with the cathode of positive discharge diode D2, described
The cathode of positive discharge diode D2 is further connected with the electricity being measured in real time for the input voltage to DC voltage converting circuit
Press detection circuit；Wireless communication module, the output end and voltage detecting of the current detection circuit are connected on the microprocessor
The output end of circuit is connect with the input terminal of microprocessor, and the output of the microprocessor is terminated with by-pass switch control and drives
The output end of dynamic circuit and two-way switch controlling and driving circuits, the by-pass switch and by-pass switch controlling and driving circuits connects
It connects, the two-way switch is connect with the output end of two-way switch controlling and driving circuits.
It is above-mentioned to use the self-powered electric network fault detection device of short circuit current, it is characterised in that: the rectification circuit is
The full bridge rectifier being made of diode D3, diode D4, diode D5 and diode D6, the cathode of the diode D3 with
The anode of diode D4 connects and is the first AC signal input terminal AC1 of rectification circuit, the cathode and two of the diode D6
The anode of pole pipe D5 connects and is the second AC signal input terminal AC2 of rectification circuit, the cathode of the diode D4 and two poles
The cathode of pipe D5 connects and is the anode and diode D6 of positive DC the voltage output end V+, the diode D3 of rectification circuit
Anode connection and be rectification circuit negative DC voltage output end V-；First AC signal input terminal of the rectification circuit
One end of the secondary side of AC1 and current transformer connects, and the second AC signal input terminal AC2 and electric current of the rectification circuit are mutual
The other end of the secondary side of sensor connects.
Above-mentioned uses the self-powered electric network fault detection device of short circuit current, it is characterised in that: the DC voltage turns
Changing circuit includes voltage conversion chip U1, polar capacitor C1 and polar capacitor C2, and the input terminal of the voltage conversion chip U1 draws
Foot VIN be DC voltage converting circuit input terminal and with polar capacitor C1 anode connect, the voltage conversion chip U1's
Output pin OUT is the output end VCC of DC voltage converting circuit and connect with the anode of polar capacitor C2 that the voltage turns
It changes the ground terminal pin GND of chip U1, the cathode of polar capacitor C1 and is grounded with the cathode of polar capacitor C2.
It is above-mentioned to use the self-powered electric network fault detection device of short circuit current, it is characterised in that: the two-way switch is
The grid of enhanced PMOS tube Q2, the enhanced PMOS tube Q2 are connect with the output end of two-way switch controlling and driving circuits,
The super capacitor anode connect with the drain electrode of the enhanced PMOS tube Q2, the source electrode of the enhanced PMOS tube Q2 with instead
It is connected to the cathode of discharge prevention diode D1.
Above-mentioned uses the self-powered electric network fault detection device of short circuit current, it is characterised in that: the two-way switch control
System is two-way switch control with one end that driving circuit includes triode VT2, resistance R3, resistance R4 and resistance R5, the resistance R5
System is connect with the control signal input of driving circuit and with the output end of microprocessor, the base stage and electricity of the triode VT2
Hinder the other end connection of R5, the emitter ground connection of the triode VT2, the collector of the triode VT2 and the one of resistance R4
Connection is held, the other end of the resistance R4 is the output end of two-way switch controlling and driving circuits, and by resistance R3 and reversely
The cathode of discharge prevention diode D1 connects.
It is above-mentioned to use the self-powered electric network fault detection device of short circuit current, it is characterised in that: the by-pass switch is
The grid of enhanced NMOS tube Q1, the enhanced NMOS tube Q1 are connect with the output end of by-pass switch controlling and driving circuits,
The drain electrode of the enhanced NMOS tube Q1 and the cathode output end of rectification circuit connect；The current detection circuit is by current sample
Resistance Rs is constituted, and one end of the current sampling resistor Rs is connect with the source electrode of the enhanced NMOS tube Q1, and the electric current is adopted
The other end of sample resistance Rs is the output end of current detection circuit, and connect with the cathode output end of rectification circuit.
Above-mentioned uses the self-powered electric network fault detection device of short circuit current, it is characterised in that: the by-pass switch control
System is that by-pass switch is controlled and driven with one end that driving circuit includes triode VT1, resistance R1 and resistance R2, the resistance R1
It the control signal input of circuit and is connect with the output end of microprocessor, the base stage of the triode VT1 is another with resistance R1's
One end connection, the collector of the triode VT1 are connect with one end of resistance R2, the other end of the resistance R2 and the forward direction
The cathode of discharge diode D2 connects, the output end of the transmitting extremely by-pass switch controlling and driving circuits of the triode VT1.
It is above-mentioned to use the self-powered electric network fault detection device of short circuit current, it is characterised in that: the microprocessor is
Mixed-signal processor, the wireless communication module are gsm wireless communication module.
Above-mentioned uses the self-powered electric network fault detection device of short circuit current, it is characterised in that: the voltage detecting electricity
Concatenated resistance R6 and resistance R7 composition is routed, one end of resistance R6 and resistance R7 after series connection are with positive discharge diode D2's
The connecting pin of cathode connection, the other end ground connection of resistance R6 and resistance R7 after series connection, the resistance R6 and resistance R7 are voltage
The output end of detection circuit.The present invention also provides a kind of method and steps, and simple, realization easily uses short circuit current self-powered
Electric network fault detection method, which is characterized in that the detailed process of this method are as follows:
The primary side of current transformer is connected on power network line；
When power network line occur short trouble and make in power network line generate transient high-current when, current transformer it is primary
Side has high current to flow through, and the electric current for being coupled to the secondary side of current transformer converts electricity to DC voltage first by rectification circuit
Road power supply, DC voltage converting circuit generate operating voltage required for microprocessor and wireless communication module, microprocessor and
Radio communication mold BOB(beginning of block) works normally；Current detection circuit is measured in real time the electric current of Current Transformer Secondary side and incites somebody to action
The input voltage that the current signal detected is converted to microprocessor is exported to microprocessor, micro- when current detection circuit output
When the input voltage of processor reaches the down trigger voltage of microprocessor, microprocessor processes are interrupted, and fault-signal is passed through
Wireless communication module is sent to control centre；Voltage detecting circuit examines the input voltage of DC voltage converting circuit in real time
It surveys and the signal that will test is exported to microprocessor, microprocessor is electric by the input of received DC voltage converting circuit
Press detected value compared with the charging starting voltage preset in the microprocessor, when the input electricity of DC voltage converting circuit
When pressure detected value is greater than the charging starting voltage preset in the microprocessor, microprocessor exports control signal to two-way opened
Controlling and driving circuits are closed, two-way switch controlling and driving circuits drive two-way switch conducting, the direct current of rectification circuit output
Stream gives super capacitor charging energy-storing after back discharge protection diode D1；When the input voltage of DC voltage converting circuit is examined
When measured value is greater than the charging stopping voltage presetting in the microprocessor, microprocessor exports control signal and gives by-pass switch control
System and driving circuit, by-pass switch controlling and driving circuits drive by-pass switch conducting, the DC current warp of rectification circuit output
It crosses by-pass switch and forms flow cycle；
When power network line occurs short trouble and makes the error protection circuit breaker trip in power network line, super capacitor is made
For backup power supply, powered by two-way switch to DC voltage converting circuit, to continue as microprocessor and radio communication mold
Block provides stable operating voltage, guarantees the normal work of microprocessor and wireless communication module, and microprocessor continues through nothing
Line communication module sends fault-signal to control centre.
Compared with the prior art, the present invention has the following advantages:
1, the circuit structure of the invention using the self-powered electric network fault detection device of short circuit current is simple, and design is closed
Reason, it is convenient to realize.
2, the use self-powered electric network fault detection device of short circuit current of the invention in power network line in use, normally transport
When row, power network line electric current is smaller, and device is generally in suspend mode operating mode, when short trouble occurs for route, device starting
Work, it is low in energy consumption.
3, the present invention takes electricity using current transformer from power network line, and is aided with super capacitor energy-storage and is embodied as the power grid
The uninterrupted power supply of fault detection means, this mode are compared with traditional approach, have taken into account the size of electric network fault detection device
With service life, it is that conventional method is incomparable, since current transformer is cheap compared with voltage transformer, and is convenient to
It is mounted on panel switches box house or opening form is made and directly hang on distribution line, so for the failure of overhead transmission line
Detection, using current transformer take electricity super capacitor energy-storing method of supplying power to be a kind of great application prospect power supply mode.
4, the present invention takes electricity using current transformer from power network line, can be realized being isolated for high voltage and low-voltage,
After guaranteeing primary side failure, which still can securely and reliably work, and need height particularly suitable for power grid one kind
The system of voltage fault signal detection.
5, the present invention is high using power density, the service life is long, environmentally protective, and the super capacitor with wide operating temperature range
As standby energy storage device, the high reliablity of backup power supply ensure that the reliability of entire electric network fault detection device work.
6, the huge short circuit energy generated when the present invention takes full advantage of power network line short trouble, Current Transformer take
Electricity, super capacitor energy-storage realize self-powered, provide new approaches for Guangdong power system detection device power supply plan.
7, opening for two-way switch and by-pass switch of the present invention cooperates outside using the internal simulation comparator of microprocessor
The driving circuit of triode realizes that breakdown judge utilizes the implement of interruption function of microprocessor, one microprocessor of judgment and detection
It realizes, reduces the complexity of circuit structure.
8, fault-signal can be sent in real time control centre, be realized by the present invention by setting wireless communication module
The long-range automatic monitoring of electric network fault and intelligence.
9, the method and step of the invention using the self-powered electric network fault detection method of short circuit current is simple, realization side
Just.
10, the present invention can be advantageously used in electric network fault detection, can notify power network line control centre in time and pacify
Row service personnel debugs in time, restores operation power, can reduce to a certain extent because power failure bring economy is damaged
It loses.
In conclusion circuit structure of the invention is simple, rationally, the method and step of detection is simple, intelligence degree for design
Height, functional reliability is high, and practical, using effect is good, convenient for promoting the use of.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram that the present invention uses the self-powered electric network fault detection device of short circuit current.
Fig. 2 is the circuit diagram that the present invention uses the self-powered electric network fault detection device of short circuit current.
Description of symbols:
1-rectification circuit；2-current detection circuits；3-by-pass switches；
4-DC voltage converting circuits；5-two-way switch；6-super capacitors；
7-wireless communication modules；8-microprocessors；9-by-pass switches control with
Driving circuit；
10-two-way switch controlling and driving circuits；11-voltage detecting circuits；12-current transformers.
Specific embodiment
As depicted in figs. 1 and 2, the use self-powered electric network fault detection device of short circuit current of the invention, including be used for
The current transformer 12 of electricity is taken from power network line when short circuit occurs in power network line and is connected with the output end of current transformer 12
Rectification circuit 1 and microprocessor 8, back discharge protection diode D1, positive discharge diode D2, the DC voltage connect turns
Change circuit 4, two-way switch 5 and super capacitor 6；The cathode output end of the rectification circuit 1 is connected to by-pass switch 3, the rectification
The cathode output end of circuit 1 is connected to the current detection circuit being measured in real time for the electric current to 12 secondary side of current transformer
2, the current detection circuit 2 is connect with by-pass switch 3；The anode and rectification circuit 1 of the back discharge protection diode D1
Cathode output end and by-pass switch 3 connect, the anode and two-way switch 5 of the forward direction discharge diode D2 is and back discharge
The cathode of protection diode D1 connects, and the anode of the super capacitor 6 is connect with two-way switch 5, the cathode of the super capacitor 6
Ground connection, the input terminal of the DC voltage converting circuit 4 are connect with the cathode of positive discharge diode D2, the positive electric discharge two
The cathode of pole pipe D2 is further connected with the voltage detecting circuit being measured in real time for the input voltage to DC voltage converting circuit 4
11；Wireless communication module 7, the output end and voltage detecting circuit 11 of the current detection circuit 2 are connected on the microprocessor 8
Output end connect with the input terminal of microprocessor 8, the output of the microprocessor 8 be terminated with by-pass switch control and driving
Circuit 9 and two-way switch controlling and driving circuits 10, the output of the by-pass switch 3 and by-pass switch controlling and driving circuits 9
End connection, the two-way switch 5 are connect with the output end of two-way switch controlling and driving circuits 10.
As shown in Fig. 2, the rectification circuit 1 is by diode D3, diode D4, diode D5 and two in the present embodiment
The full bridge rectifier of pole pipe D6 composition, the cathode of the diode D3 connect with the anode of diode D4 and are rectification circuit 1
The first AC signal input terminal AC1, the cathode of the diode D6 connect with the anode of diode D5 and for rectification circuit 1
Second AC signal input terminal AC2, the cathode of the diode D4 connect with the cathode of diode D5 and for rectification circuit 1 just
Pole DC voltage output end V+, the anode of the diode D3 connect with the anode of diode D6 and are the cathode of rectification circuit 1
DC voltage output end V-；The secondary side of the first AC signal input terminal AC1 and current transformer 12 of the rectification circuit 1
The other end of one end connection, the secondary side of the second AC signal input terminal AC2 and current transformer 12 of the rectification circuit 1 connects
It connects.
As shown in Fig. 2, the DC voltage converting circuit 4 includes voltage conversion chip U1, polar capacitor in the present embodiment
The input terminal pin VIN of C1 and polar capacitor C2, the voltage conversion chip U1 be DC voltage converting circuit 4 input terminal and
It is connect with the anode of polar capacitor C1, the output pin OUT of the voltage conversion chip U1 is DC voltage converting circuit 4
Output end VCC and with polar capacitor C2 anode connect, ground terminal pin GND, the polar capacitor of the voltage conversion chip U1
The cathode of C1 and the cathode of polar capacitor C2 are grounded.When it is implemented, the voltage conversion chip U1 is chip LM7805；
As shown in Fig. 2, the two-way switch 5 is enhanced PMOS tube Q2, the enhanced PMOS tube Q2 in the present embodiment
Grid connect with the output end of two-way switch controlling and driving circuits 10, the super capacitor 6 anode with it is described enhanced
The drain electrode of PMOS tube Q2 connects, and the source electrode of the enhanced PMOS tube Q2 is connect with the cathode of back discharge protection diode D1.
As shown in Fig. 2, the two-way switch controlling and driving circuits 10 include triode VT2, resistance in the present embodiment
One end of R3, resistance R4 and resistance R5, the resistance R5 are the control signal input of two-way switch controlling and driving circuits 10
And connect with the output end of microprocessor 8, the base stage of the triode VT2 is connect with the other end of resistance R5, the triode
The emitter of VT2 is grounded, and the collector of the triode VT2 is connect with one end of resistance R4, and the other end of the resistance R4 is
The output end of two-way switch controlling and driving circuits 10, and connected by the cathode of resistance R3 and back discharge protection diode D1
It connects.
As shown in Fig. 2, the by-pass switch 3 is enhanced NMOS tube Q1, the enhanced NMOS tube Q1 in the present embodiment
Grid connect with the output end of by-pass switch controlling and driving circuits 9, the drain electrode and rectified current of the enhanced NMOS tube Q1
The cathode output end on road 1 connects；The current detection circuit 2 is made of current sampling resistor Rs, the current sampling resistor Rs
One end connect with the source electrode of the enhanced NMOS tube Q1, the other end of the current sampling resistor Rs is current detection circuit
2 output end, and connect with the cathode output end of rectification circuit 1.
As shown in Fig. 2, the by-pass switch controlling and driving circuits 9 include triode VT1, resistance R1 in the present embodiment
With resistance R2, one end of the resistance R1 is the control signal input and and micro process of by-pass switch controlling and driving circuits 9
The output end of device 8 connects, and the base stage of the triode VT1 is connect with the other end of resistance R1, the collector of the triode VT1
It being connect with one end of resistance R2, the other end of the resistance R2 is connect with the cathode of the positive discharge diode D2, and described three
The output end of the transmitting extremely by-pass switch controlling and driving circuits 9 of pole pipe VT1.
As shown in Fig. 2, the microprocessor 8 is mixed-signal processor, the wireless communication module 7 in the present embodiment
For gsm wireless communication module.When it is implemented, the microprocessor 8 is MSP430 series low-power consumption mixed-signal processor, institute
State the model SIM900 of gsm wireless communication module.
As shown in Fig. 2, the voltage detecting circuit 11 is made of concatenated resistance R6 and resistance R7 in the present embodiment, string
One end of resistance R6 and resistance R7 after connection are connect with the cathode of positive discharge diode D2, the resistance R6 and resistance R7 after series connection
Other end ground connection, the connecting pin of the resistance R6 and resistance R7 are the output end of voltage detecting circuit 11.
Of the invention uses the self-powered electric network fault detection method of short circuit current, detailed process are as follows:
The primary side of current transformer 12 is connected on power network line；
When making to generate instantaneous (tens ms) high current in power network line when short trouble occurs for power network line, electric current is mutual
The primary side of sensor 12 has high current to flow through, and the electric current for being coupled to the secondary side of current transformer 12 passes through rectification circuit 1 first
It powers to DC voltage converting circuit 4, DC voltage converting circuit 4 generates required for microprocessor 8 and wireless communication module 7
Operating voltage, microprocessor 8 and wireless communication module 7 start to work normally；Current detection circuit 2 is to current transformer 12 2 times
The electric current of side is measured in real time and the current signal that will test is converted to the input voltage of microprocessor 8 and exports to micro process
Device 8, it is micro- when the input voltage for the microprocessor 8 that current detection circuit 2 exports reaches the down trigger voltage of microprocessor 8
The processing of processor 8 is interrupted, and by fault-signal, module 7 is sent to control centre by wireless communication；Voltage detecting circuit 11 is to straight
The input voltage of galvanic electricity voltage conversion circuit 4 is measured in real time and the signal that will test is exported to microprocessor 8, microprocessor
8 play the input voltage measurement value of received DC voltage converting circuit 4 with the charging being set in advance in microprocessor 8
Beginning voltage compares, and is set in advance in filling in microprocessor 8 when the input voltage measurement value of DC voltage converting circuit 4 is greater than
When electrical initiation voltage, microprocessor 8 exports control signal to two-way switch controlling and driving circuits 10, two-way switch control and drive
Dynamic circuit 10 drives two-way switch 5 to be connected, and the DC current that rectification circuit 1 exports is given after back discharge protection diode D1
6 charging energy-storing of super capacitor；Microprocessor 8 is set in advance in when the input voltage measurement value of DC voltage converting circuit 4 is greater than
In charging stop voltage when, microprocessor 8 export controls signal to by-pass switch controlling and driving circuits 9, by-pass switch control
System drives by-pass switch 3 to be connected with driving circuit 9, and the DC current that rectification circuit 1 exports circulates back by the formation of by-pass switch 2
Road；At this point, super capacitor 6 is in floating charge mode；
When power network line occurs short trouble and makes the error protection circuit breaker trip in power network line, super capacitor 6
As backup power supply, powered by two-way switch 5 to DC voltage converting circuit 4, to continue as microprocessor 8 and channel radio
Letter module 7 provides stable operating voltage, guarantees the normal work of microprocessor 8 and wireless communication module 7, microprocessor 8 after
Continuous module 7 by wireless communication sends fault-signal to control centre.
The present invention takes electricity using current transformer from power network line, and is aided with super capacitor energy-storage and is embodied as power grid event
Hinder the uninterrupted power supply of detection device, this mode compares with traditional approach, taken into account the size of electric network fault detection device with
Service life is that conventional method is incomparable, ensure that the reliability of entire electric network fault detection device work.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (8)
1. a kind of use the self-powered electric network fault detection device of short circuit current, it is characterised in that: including in power network line
Occur taking the current transformer (12) of electricity when short circuit from power network line and be connect with the output end of current transformer (12) whole
Current circuit (1) and microprocessor (8), back discharge protection diode D1, positive discharge diode D2, DC voltage conversion
Circuit (4), two-way switch (5) and super capacitor (6)；The cathode output end of the rectification circuit (1) is connected to by-pass switch (3),
The cathode output end of the rectification circuit (1), which is connected to, to be measured in real time for the electric current to current transformer (12) secondary side
Current detection circuit (2), the current detection circuit (2) connect with by-pass switch (3)；The back discharge protection diode D1
Anode connect with the cathode output end of rectification circuit (1) and by-pass switch (3), the anode of the forward direction discharge diode D2 and
Two-way switch (5) is connect with the cathode of back discharge protection diode D1, the anode and two-way switch of the super capacitor (6)
(5) it connects, the cathode ground connection of the super capacitor (6), the input terminal of the DC voltage converting circuit (4) and positive electric discharge two
The cathode of pole pipe D2 connects, and the cathode of the forward direction discharge diode D2 is further connected with for DC voltage converting circuit (4)
The voltage detecting circuit (11) that input voltage is measured in real time；Wireless communication module (7) are connected on the microprocessor (8),
The input terminal of the output end of the current detection circuit (2) and the output end of voltage detecting circuit (11) with microprocessor (8)
Connection, the output of the microprocessor (8) are terminated with by-pass switch controlling and driving circuits (9) and two-way switch control and driving
Circuit (10), the by-pass switch (3) connect with the output end of by-pass switch controlling and driving circuits (9), the two-way switch
(5) it is connect with the output end of two-way switch controlling and driving circuits (10)；
The DC voltage converting circuit (4) includes voltage conversion chip U1, polar capacitor C1 and polar capacitor C2, the voltage
The input terminal pin VIN of conversion chip U1 is the input terminal of DC voltage converting circuit (4) and connects with the anode of polar capacitor C1
It connects, the output pin OUT of the voltage conversion chip U1 is the output end VCC and and polarity of DC voltage converting circuit (4)
The anode connection of capacitor C2, the cathode and polar capacitor of the ground terminal pin GND of the voltage conversion chip U1, polar capacitor C1
The cathode of C2 is grounded；
The microprocessor (8) is mixed-signal processor, and the wireless communication module (7) is gsm wireless communication module.
2. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
Rectification circuit (1) is the full bridge rectifier being made of diode D3, diode D4, diode D5 and diode D6, described two
The cathode of pole pipe D3 connect with the anode of diode D4 and for the first AC signal input terminal AC1 of rectification circuit (1), and described two
The cathode of pole pipe D6 connect with the anode of diode D5 and for the second AC signal input terminal AC2 of rectification circuit (1), and described two
The cathode of pole pipe D4 connect with the cathode of diode D5 and for the positive DC voltage output end V+ of rectification circuit (1), and described two
The anode of pole pipe D3 connect with the anode of diode D6 and is the negative DC voltage output end V- of rectification circuit (1)；It is described whole
First AC signal input terminal AC1 of current circuit (1) is connect with one end of the secondary side of current transformer (12), the rectified current
The second AC signal input terminal AC2 on road (1) is connect with the other end of the secondary side of current transformer (12).
3. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
Two-way switch (5) is enhanced PMOS tube Q2, the grid and two-way switch controlling and driving circuits of the enhanced PMOS tube Q2
(10) output end connection, the anode of the super capacitor (6) are connect with the drain electrode of the enhanced PMOS tube Q2, the enhancing
The source electrode of type PMOS tube Q2 is connect with the cathode of back discharge protection diode D1.
4. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
Two-way switch controlling and driving circuits (10) include triode VT2, resistance R3, resistance R4 and resistance R5, and the one of the resistance R5
End is the control signal input of two-way switch controlling and driving circuits (10) and connect with the output end of microprocessor (8), institute
The base stage for stating triode VT2 is connect with the other end of resistance R5, the emitter ground connection of the triode VT2, the triode VT2
Collector connect with one end of resistance R4, the other end of the resistance R4 is the defeated of two-way switch controlling and driving circuits (10)
Outlet, and connect by resistance R3 with the cathode of back discharge protection diode D1.
5. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
By-pass switch (3) is enhanced NMOS tube Q1, the grid and by-pass switch controlling and driving circuits of the enhanced NMOS tube Q1
(9) output end connection, the drain electrode of the enhanced NMOS tube Q1 are connect with the cathode output end of rectification circuit (1)；The electricity
Current detection circuit (2) is made of current sampling resistor Rs, one end of the current sampling resistor Rs and the enhanced NMOS tube
The source electrode of Q1 connects, and the other end of the current sampling resistor Rs is the output end of current detection circuit (2), and and rectification circuit
(1) cathode output end connection.
6. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
By-pass switch controlling and driving circuits (9) include one end of triode VT1, resistance R1 and resistance R2, the resistance R1 for bypass
Switch control is connect with the control signal input of driving circuit (9) and with the output end of microprocessor (8), the triode
The base stage of VT1 is connect with the other end of resistance R1, and the collector of the triode VT1 is connect with one end of resistance R2, the electricity
The other end for hindering R2 is connect with the cathode of the positive discharge diode D2, the transmitting extremely by-pass switch of the triode VT1
The output end of controlling and driving circuits (9).
7. described in accordance with the claim 1 use the self-powered electric network fault detection device of short circuit current, it is characterised in that: described
Voltage detecting circuit (11) is made of concatenated resistance R6 and resistance R7, one end of resistance R6 and resistance R7 after series connection and forward direction
The cathode of discharge diode D2 connects, the other end ground connection of resistance R6 and resistance R7 after series connection, the resistance R6 and resistance R7
Connecting pin be voltage detecting circuit (11) output end.
8. a kind of method for carrying out electric network fault detection using electric network fault detection device as described in claim 1, feature
It is, the detailed process of this method are as follows:
The primary side of current transformer (12) is connected on power network line；
When power network line occur short trouble and make in power network line generate transient high-current when, current transformer (12) it is primary
Side has high current to flow through, and the electric current for being coupled to the secondary side of current transformer (12) passes through rectification circuit (1) first to direct current
Voltage conversion circuit (4) power supply, DC voltage converting circuit (4) generate required for microprocessor (8) and wireless communication module (7)
Operating voltage, microprocessor (8) and wireless communication module (7) start to work normally；Current detection circuit (2) is to current transformer
(12) electric current of secondary side be measured in real time and the current signal that will test be converted to microprocessor (8) input voltage it is defeated
It gives out microprocessor (8), when the input voltage of the microprocessor (8) of current detection circuit (2) output reaches microprocessor (8)
When down trigger voltage, microprocessor (8) processing is interrupted, and by fault-signal, module (7) is sent in control by wireless communication
The heart；The letter that voltage detecting circuit (11) is measured in real time and will test to the input voltage of DC voltage converting circuit (4)
Number output is given microprocessor (8), and microprocessor (8) is by the input voltage measurement of received DC voltage converting circuit (4)
It is worth compared with the charging starting voltage being set in advance in microprocessor (8), when the input electricity of DC voltage converting circuit (4)
Pressure detected value be greater than be set in advance in microprocessor (8) charging starting voltage when, microprocessor (8) export control signal to
Two-way switch controlling and driving circuits (10), two-way switch controlling and driving circuits (10) drive two-way switch (5) conducting, rectification
The DC current of circuit (1) output gives super capacitor (6) charging energy-storing after back discharge protection diode D1；Work as direct current
When the input voltage measurement value of voltage conversion circuit (4) is greater than the charging stopping voltage being set in advance in microprocessor (8), micro- place
Reason device (8) exports control signal and gives by-pass switch controlling and driving circuits (9), by-pass switch controlling and driving circuits (9) driving
The DC current of by-pass switch (3) conducting, rectification circuit (1) output forms flow cycle by by-pass switch (2)；
When power network line occurs short trouble and makes the error protection circuit breaker trip in power network line, super capacitor (6) is made
For backup power supply, powered by two-way switch (5) to DC voltage converting circuit (4), to continue as microprocessor (8) and nothing
Line communication module (7) provides stable operating voltage, guarantees the normal work of microprocessor (8) and wireless communication module (7), micro-
Processor (8) continues through wireless communication module (7) and sends fault-signal to control centre.
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| CN106774298B (en) * | 2016-11-17 | 2019-09-27 | 西安科技大学 | Autonomous charging of robots system and method based on camera and laser aiming positioning |
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| CN109980913B (en) * | 2017-12-27 | 2021-11-02 | 中兴通讯股份有限公司 | Switching power supply and voltage output method |
| WO2019179613A1 (en) * | 2018-03-21 | 2019-09-26 | Abb Schweiz Ag | Health investigation in a circuit breaker |
| CN109507470B (en) * | 2018-11-06 | 2021-11-05 | 武汉领普科技有限公司 | Self-powered method and device based on polarity detection |
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| CN110133356B (en) * | 2019-05-23 | 2021-07-13 | 唐智科技湖南发展有限公司 | Self-power-generation type current detection sensor |
| CN113189388A (en) * | 2020-01-14 | 2021-07-30 | 西门子股份公司 | Current sensor unit and current detection circuit |
| CN113189389A (en) * | 2020-01-14 | 2021-07-30 | 西门子股份公司 | Current sensor unit and current detection circuit |
| CN112054585A (en) * | 2020-08-24 | 2020-12-08 | 杭州电子科技大学 | Three-section type current transformer power-taking circuit |
| CN113075607B (en) * | 2021-03-18 | 2022-04-22 | 浙江聚创智能科技有限公司 | Metering type mutual inductor self-power-taking type measuring circuit in electronic circuit breaker |
| CN113406533A (en) * | 2021-06-04 | 2021-09-17 | 青岛鼎信通讯股份有限公司 | Passive electric leakage monitoring circuit used in cooperation with acquisition terminal |
| CN113571389A (en) * | 2021-09-23 | 2021-10-29 | 武汉精熔潮电气科技有限公司 | Passive short circuit detection self-triggering device |
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