CN205679717U - A kind of power network line short trouble testing circuit - Google Patents
A kind of power network line short trouble testing circuit Download PDFInfo
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- CN205679717U CN205679717U CN201620519512.3U CN201620519512U CN205679717U CN 205679717 U CN205679717 U CN 205679717U CN 201620519512 U CN201620519512 U CN 201620519512U CN 205679717 U CN205679717 U CN 205679717U
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Abstract
The utility model discloses a kind of power network line short trouble testing circuit, including current transformer, rectification circuit, microprocessor, back discharge protection diode D1, forward discharge diode D2, DC voltage converting circuit, two-way switch and super capacitor；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 forward discharge diode D2 is connected with the negative electrode of back discharge protection diode D1, and the positive pole of super capacitor is connected with two-way switch, and the negative electrode of forward discharge diode D2 is further connected with voltage detecting circuit；Being connected to wireless communication module on microprocessor, the output of microprocessor is connected to by-pass switch controlling and driving circuits and two-way switch controlling and driving circuits.Circuit structure of the present utility model is simple, reasonable in design, low in energy consumption, and intelligence degree is high, and functional reliability is high, and practical, using effect is good, it is simple to promote the use of.
Description
Technical field
The utility model belongs to electric network fault detection technique field, is specifically related to a kind of power network line short trouble detection electricity
Road.
Background technology
Power system security, stable, run reliably, to producing and user power utilization has important economic implications, so having
Necessity is monitored and controlled in real time to electrical network, improves its safety and reliability running.When power network line occurs short
During the fault such as road, open circuit, fault can be detected in time, and send fault message to control centre, notify maintainer, in time
Fix a breakdown, recover operation power.Failure detector is a kind of electric power facility, has extensive application in electrical network auxiliary facility,
It detects line fault by senser element, coordinates signal processing module, it is achieved fault type judges, utilizes wireless transport module
Send fault message to control centre, it is achieved fault detect and transmission.Existing power circuit on-line measuring device is remote,
It is difficult to way routinely and solves power supply supply problem, be applied to the power supply of transmission line malfunction detection at present, generally use the sun
Can cell panel, voltage transformer power taking from electrical network, current transformer power taking from electrical network, wind light mutual complementing, earth connection sensing etc.
Mode power taking, the scheme being equipped with batteries to store energy realizes that detection device is powered.But solar panel work by weather, weather,
The impacts such as geography, actually used have certain defect；Wind light mutual complementing scheme is suitable for the place in sunshine-duration length, wind-force abundance；Connect
Ground wire sensing power taking needs to lay new or use on the transmission line of electricity being designed with lightning-arrest trolley line of electric network reconstruction；Mutual induction of voltage
Device summation current transformer is directly mounted on transmission line of electricity, applies more.
Electric network fault detection device has following several ways at present: mode (1) solar panel coordinates battery to supply
Electricity, realizes fault detect with transformer, realizes that short-range information is transmitted with ZigBee, and fault-signal is sent to shaft tower
Box substation, being sent a signal to control centre by the wireless device in case, it is achieved fault message is reported and submitted；Mode (2) uses electric current
Or the direct power taking of voltage transformer, coordinating lithium battery power supply, while transformer takes energy, detection fault, realizes short distance with ZigBee
From information transmission, fault message is sent to nearest transmission substation, by substation send to higher level's terminal, it is achieved fault believe
Breath is reported and submitted；Mode (3) Current Transformer or voltage transformer coordinate lithium battery or battery to realize device energy supply, and transformer takes
While energy, detection fault, uses gsm wireless module, directly remotely sends to control centre fault message.For mode (1),
Whole device is divided into two parts, and volume is big, and solar panel is affected by weather, geography, weather again, and power supply performance is unstable
Fixed；Problem mode (2) being equally existed to mode (1), device is divided into two parts, and volume is big, installs complexity；For mode
(3), current transformer or voltage transformer coordinate battery or lithium battery to realize power supply, and battery and service life of lithium battery are shorter,
And charge-discharge performance is affected by temperature, weather, geography.
In sum, all there is the deficiency on certain use in electric network fault of the prior art detection device, it is impossible to very well
Ground meets actually used demand.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, provides a kind of electrical network
Line short fault testing circuit, its circuit structure is simple, reasonable in design, low in energy consumption, and intelligence degree is high, functional reliability
Height, practical, using effect is good, it is simple to promote the use of.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: a kind of power network line short trouble inspection
Slowdown monitoring circuit, it is characterised in that: include for power network line occur short circuit when from power network line power taking current transformer and
The rectification circuit being connected with the output of current transformer, and microprocessor, back discharge protection diode D1, forward electric discharge
Diode D2, DC voltage converting circuit, two-way switch and super capacitor；The cathode output end of described rectification circuit is connected to bypass
Switch, the cathode output end of described rectification circuit is connected to the electricity for detecting the electric current of Current Transformer Secondary side in real time
Current detection circuit, described current detection circuit is connected with by-pass switch；Described back discharge protection diode D1 anode with whole
The cathode output end of current circuit and by-pass switch connect, the anode of described forward discharge diode D2 and two-way switch all with reverse
The negative electrode of discharge prevention diode D1 connects, and the positive pole of described super capacitor is connected with two-way switch, bearing of described super capacitor
Pole is grounded, and the input of described DC voltage converting circuit is connected with the negative electrode of forward discharge diode D2, and described forward discharges
The negative electrode of diode D2 is further connected with the voltage detecting electricity for detecting the input voltage of DC voltage converting circuit in real time
Road；It is connected to wireless communication module, the output of described current detection circuit and voltage detecting circuit defeated on described microprocessor
Go out end be all connected with the input of microprocessor, the output of described microprocessor be connected to by-pass switch controlling and driving circuits with
Two-way switch controlling and driving circuits, described by-pass switch is connected with the output of by-pass switch controlling and driving circuits, described
Two-way switch is connected with the output of two-way switch controlling and driving circuits.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described rectification circuit is for by diode
Full bridge rectifier, the negative electrode of described diode D3 and the diode D4 of D3, diode D4, diode D5 and diode D6 composition
Anode connect and for the first AC signal input AC1 of rectification circuit, the negative electrode of described diode D6 is with diode D5's
Anode connects and the second AC signal input AC2 for rectification circuit, the negative electrode of described diode D4 and the moon of diode D5
Pole connects and the positive DC voltage output end V+ for rectification circuit, and the anode of described diode D3 connects with the anode of diode D6
Connect and the negative DC voltage output end V-for rectification circuit；First AC signal input AC1 of described rectification circuit and electricity
One end of the secondary side of current transformer connects, the second AC signal input AC2 of described rectification circuit and current transformer
The other end of secondary side connects.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described DC voltage converting circuit bag
Including voltage conversion chip U1, polar capacitor C1 and polar capacitor C2, the input pin VIN of described voltage conversion chip U1 is straight
Flow the input of voltage conversion circuit and be connected with the positive pole of polar capacitor C1, the output pin of described voltage conversion chip U1
OUT is the output VCC of DC voltage converting circuit and is connected with the positive pole of polar capacitor C2, described voltage conversion chip U1
Earth terminal pin GND, polar capacitor C1 negative pole and and the negative pole of polar capacitor C2 be all grounded.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described two-way switch is enhancement mode
PMOS Q2, the grid of described enhancement mode PMOS Q2 is connected with the output of two-way switch controlling and driving circuits, described super
The positive pole of level electric capacity is connected with the drain electrode of described enhancement mode PMOS Q2, the source electrode of described enhancement mode PMOS Q2 and back discharge
The negative electrode of protection diode D1 connects.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: the control of described two-way switch and driving
Circuit includes triode VT2, resistance R3, resistance R4 and resistance R5, and one end of described resistance R5 is two-way switch control and driving
The control signal input of circuit and being connected with the output of microprocessor, the base stage of described triode VT2 is another with resistance R5's
One end connects, and the grounded emitter of described triode VT2, the colelctor electrode of described triode VT2 is connected with one end of resistance R4, institute
The other end stating resistance R4 is the output of two-way switch controlling and driving circuits, and protects two by resistance R3 with back discharge
The negative electrode of pole pipe D1 connects.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described by-pass switch is enhancement mode
NMOS tube Q1, the grid of described enhancement mode NMOS tube Q1 is connected with the output of by-pass switch controlling and driving circuits, described increasing
The drain electrode of strong type NMOS tube Q1 is connected with the cathode output end of rectification circuit；Described current detection circuit is by current sampling resistor Rs
Constituting, one end of described current sampling resistor Rs is connected with the source electrode of described enhancement mode NMOS tube Q1, described current sampling resistor
The other end of Rs is the output of current detection circuit, and is connected with the cathode output end of rectification circuit.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: the control of described by-pass switch and driving
Circuit includes triode VT1, resistance R1 and resistance R2, and one end of described resistance R1 is the control of by-pass switch controlling and driving circuits
Signal input part processed and being connected with the output of microprocessor, the base stage of described triode VT1 is connected with the other end of resistance R1,
The colelctor electrode of described triode VT1 is connected with one end of resistance R2, the other end of described resistance R2 and described forward electric discharge two poles
The negative electrode of pipe D2 connects, the output of the transmitting of described triode VT1 extremely by-pass switch controlling and driving circuits.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described microprocessor is mixed signal
Processor, described wireless communication module is gsm wireless communication module.
Above-mentioned a kind of power network line short trouble testing circuit, it is characterised in that: described voltage detecting circuit is by connecting
Resistance R6 and resistance R7 composition, the negative electrode of the resistance R6 after series connection and one end of resistance R7 and forward discharge diode D2 is even
Connecing, the other end ground connection of the resistance R6 after series connection and resistance R7, the connection end of described resistance R6 and resistance R7 is voltage detecting electricity
The output on road.
The utility model compared with prior art has the advantage that
1st, circuit structure of the present utility model is simple, reasonable in design, it is achieved convenient.
2nd, the utility model is when power network line is properly functioning, and power network line electric current is less, and device is generally in dormancy work
Operation mode, when circuit is short-circuited fault, device startup work, low in energy consumption.
3rd, the utility model uses current transformer power taking from power network line, and is aided with super capacitor energy-storage and is embodied as this
The uninterrupted power supply of electric network fault detection device, this mode is compared with traditional approach, has taken into account electric network fault detection device
Size and service life, be that conventional method is incomparable, owing to current transformer is compared with voltage transformer low price, and can be square
Just it is arranged on panel switches box house or make opening form and directly hang on distribution line, so for overhead transmission line
Fault detect, the method for supplying power to of employing current transformer power taking super capacitor energy-storage is the supplier of electricity of a kind of great application prospect
Formula.
4th, the utility model uses current transformer power taking from power network line, be capable of high voltage and low-voltage every
From, it is ensured that after primary side fault, this electric network fault detection device still can safe and reliable work, be particularly suitable for electrical network one class needs
The system of high voltage fail signal detection.
5th, the utility model uses power density height, life-span length, environmental protection, and has the super of wide operating temperature range
Electric capacity is as standby energy storage device, and the reliability of back-up source is high, it is ensured that it is reliable that whole electric network fault detection device works
Property.
6th, the huge short circuit energy that the utility model produces when taking full advantage of power network line short trouble, uses Current Mutual Inductance
Device power taking, super capacitor energy-storage, it is achieved self-powered, provide new approaches for Guangdong power system detection device power supply plan.
7th, the utility model is by arranging wireless communication module, can send fault-signal in real time to control centre, real
Long-range automatic monitoring and the intellectuality of electric network fault are showed.
8th, the utility model can be advantageously used in electric network fault detection, can notify power network line control centre in time simultaneously
Arrange maintainer to fix a breakdown in time, recover operation power, the economy brought because of power failure can be reduced to a certain extent
Loss.
In sum, circuit structure of the present utility model is simple, reasonable in design, low in energy consumption, and intelligence degree is high, and work can
High by property, practical, using effect is good, it is simple to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Brief description
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Description of reference numerals:
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 switch controlling and driving circuits；
10 two-way switch controlling and driving circuits；11 voltage detecting circuits；12 current transformers.
Detailed description of the invention
As depicted in figs. 1 and 2, a kind of power network line short trouble testing circuit of the present utility model, including at electricity
When there is short circuit in netting twine road from power network line the current transformer 12 of power taking and being connected with the output of current transformer 12
Rectification circuit 1, and microprocessor the 8th, back discharge protection diode D1, forward discharge diode D2, DC voltage conversion electricity
Road the 4th, two-way switch 5 and super capacitor 6；The cathode output end of described rectification circuit 1 is connected to by-pass switch 3, described rectification circuit 1
Cathode output end be connected to the current detection circuit 2 for detecting the electric current of current transformer 12 secondary side in real time, institute
State current detection circuit 2 to be connected with by-pass switch 3；The anode of described back discharge protection diode D1 is with rectification circuit 1 just
Pole output and by-pass switch 3 connect, and the anode of described forward discharge diode D2 and two-way switch 5 are all protected with back discharge
The negative electrode of diode D1 connects, and the positive pole of described super capacitor 6 is connected with two-way switch 5, and the negative pole of described super capacitor 6 connects
Ground, the input of described DC voltage converting circuit 4 is connected with the negative electrode of forward discharge diode D2, described forward electric discharge two poles
The negative electrode of pipe D2 is further connected with the voltage detecting circuit for detecting the input voltage of DC voltage converting circuit 4 in real time
11；It is connected to wireless communication module 7, the output of described current detection circuit 2 and voltage detecting circuit 11 on described microprocessor 8
Output be all connected with the input of microprocessor 8, the output of described microprocessor 8 be connected to by-pass switch control with drive
Circuit 9 and two-way switch controlling and driving circuits 10, the output of described by-pass switch 3 and by-pass switch controlling and driving circuits 9
End connects, and described two-way switch 5 is connected with the output of two-way switch controlling and driving circuits 10.
As in figure 2 it is shown, in the present embodiment, described rectification circuit 1 is for by diode D3, diode D4, diode D5 and two
The full bridge rectifier of pole pipe D6 composition, the negative electrode of described diode D3 is connected with the anode of diode D4 and is rectification circuit 1
The first AC signal input AC1, the negative electrode of described diode D6 is connected with the anode of diode D5 and for rectification circuit 1
Second AC signal input AC2, the negative electrode of described diode D4 be connected with the negative electrode of diode D5 and for rectification circuit 1 just
Pole DC voltage output end V+, the anode of described diode D3 is connected with the anode of diode D6 and the negative pole for rectification circuit 1
DC voltage output end V-；First AC signal input AC1 of described rectification circuit 1 and the secondary side of current transformer 12
One end connects, and the second AC signal input AC2 of described rectification circuit 1 connects with the other end of the secondary side of current transformer 12
Connect.
As in figure 2 it is shown, in the present embodiment, described DC voltage converting circuit 4 includes voltage conversion chip U1, polar capacitor
C1 and polar capacitor C2, the input pin VIN of described voltage conversion chip U1 be DC voltage converting circuit 4 input and
Being connected with the positive pole of polar capacitor C1, the output pin OUT of described voltage conversion chip U1 is DC voltage converting circuit 4
Output VCC and the positive pole with polar capacitor C2 are connected, the earth terminal pin GND of described voltage conversion chip U1, polar capacitor
The negative pole of the negative pole of C1 and polar capacitor C2 is all grounded.When being embodied as, described voltage conversion chip U1 is chip LM7805；
As in figure 2 it is shown, in the present embodiment, described two-way switch 5 is enhancement mode PMOS Q2, described enhancement mode PMOS Q2
Grid be connected with the output of two-way switch controlling and driving circuits 10, the positive pole of described super capacitor 6 and described enhancement mode
The drain electrode of PMOS Q2 connects, and the source electrode of described enhancement mode PMOS Q2 is connected with the negative electrode of back discharge protection diode D1.
As in figure 2 it is shown, in the present embodiment, described two-way switch controlling and driving circuits 10 includes triode VT2, resistance
R3, resistance R4 and resistance R5, one end of described resistance R5 is the control signal input of two-way switch controlling and driving circuits 10
And be connected with the output of microprocessor 8, the base stage of described triode VT2 is connected with the other end of resistance R5, described triode
The grounded emitter of VT2, the colelctor electrode of described triode VT2 is connected with one end of resistance R4, and the other end of described resistance R4 is
The output of two-way switch controlling and driving circuits 10, and by the negative electrode of resistance R3 and back discharge protection diode D1 even
Connect.
As in figure 2 it is shown, in the present embodiment, described by-pass switch 3 is enhancement mode NMOS tube Q1, described enhancement mode NMOS tube Q1
Grid be connected with the output of by-pass switch controlling and driving circuits 9, the drain electrode of described enhancement mode NMOS tube Q1 and rectified current
The cathode output end on road 1 connects；Described current detection circuit 2 is made up of current sampling resistor Rs, described current sampling resistor Rs
One end be connected with the source electrode of described enhancement mode NMOS tube Q1, the other end of described current sampling resistor Rs is current detection circuit
The output of 2, and be connected with the cathode output end of rectification circuit 1.
As in figure 2 it is shown, in the present embodiment, described by-pass switch controlling and driving circuits 9 includes triode VT1, resistance R1
With resistance R2, one end of described resistance R1 be by-pass switch controlling and driving circuits 9 control signal input and with micro-process
The output of device 8 connects, and the base stage of described triode VT1 is connected with the other end of resistance R1, the colelctor electrode of described triode VT1
Being connected with one end of resistance R2, the other end of described resistance R2 is connected with the negative electrode of described forward discharge diode D2, and described three
The output of the transmitting of pole pipe VT1 extremely by-pass switch controlling and driving circuits 9.
As in figure 2 it is shown, in the present embodiment, described microprocessor 8 is mixed-signal processor, described wireless communication module 7
For gsm wireless communication module.When being embodied as, described microprocessor 8 is MSP430 series low-power consumption mixed-signal processor, institute
The model stating gsm wireless communication module is SIM900.
As in figure 2 it is shown, in the present embodiment, described voltage detecting circuit 11 is made up of the resistance R6 connecting and resistance R7, string
One end of resistance R6 after connection and resistance R7 is connected with the negative electrode of forward discharge diode D2, the resistance R6 after series connection and resistance R7
Other end ground connection, the end that connects of described resistance R6 and resistance R7 is the output of voltage detecting circuit 11.
Detailed process when using the utility model to carry out the detection of power network line short trouble is:
Receive the primary side of current transformer 12 on power network line；
When making to produce in power network line instantaneous (tens ms) big electric current when power network line is short-circuited fault, electric current is mutual
The primary side of sensor 12 has big electric current to flow through, and is coupled to the electric current of secondary side of current transformer 12 by rectification circuit 1 first
Powering to DC voltage converting circuit 4, DC voltage converting circuit 4 produces required for microprocessor 8 and wireless communication module 7
Operating voltage, microprocessor 8 and wireless communication module 7 start normally to work；Current detection circuit 2 is to current transformer 12 2 times
The electric current of side detects in real time and the current signal detecting is converted to the input voltage of microprocessor 8 and exports to micro-process
Device 8, when the input voltage of the microprocessor 8 of current detection circuit 2 output reaches the down trigger voltage of microprocessor 8, micro-
Processor 8 processes and interrupts, and is sent to control centre fault-signal by wireless communication module 7；Voltage detecting circuit 11 is to directly
The input voltage of stream voltage conversion circuit 4 detects in real time and exports the signal detecting to microprocessor 8, microprocessor
The input voltage measurement value of the DC voltage converting circuit 4 that 8 are received and the charging being set in advance in microprocessor 8 rise
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 more than
During electrical initiation voltage, microprocessor 8 exports control signal to two-way switch controlling and driving circuits 10, and two-way switch controls and drives
Dynamic circuit 10 drives two-way switch 5 to turn on, and the DC current of rectification circuit 1 output is given after back discharge protection diode D1
Super capacitor 6 charging energy-storing；It is set in advance in microprocessor 8 when the input voltage measurement value of DC voltage converting circuit 4 is more than
In charging stop voltage when, microprocessor 8 exports control signal to by-pass switch controlling and driving circuits 9, by-pass switch control
System drives by-pass switch 3 to turn on drive circuit 9, and the DC current of rectification circuit 1 output forms through by-pass switch 2 and circulates back
Road；Now, super capacitor 6 is in floating charge pattern；
When power network line is short-circuited fault and makes the error protection circuit breaker trip in power network line, super capacitor 6
As back-up source, power to DC voltage converting circuit 4 by two-way switch 5, thus continue as microprocessor 8 and channel radio
Letter module 7 provides stable operating voltage, it is ensured that the normal work of microprocessor 8 and wireless communication module 7, microprocessor 8 continues
Continue and send fault-signal by wireless communication module 7 to control centre.
The utility model uses current transformer power taking from power network line, and is aided with super capacitor energy-storage and is embodied as this electricity
The uninterrupted power supply of net failure detector, this mode is compared with traditional approach, has taken into account the chi of electric network fault detection device
Very little and service life, is that conventional method is incomparable, it is ensured that the reliability of whole electric network fault detection device work.
The above, be only preferred embodiment of the present utility model, not impose any restrictions the utility model, every
Any simple modification, change and equivalent structure change above example made according to the utility model technical spirit, all still
Belong in the protection domain of technical solutions of the utility model.
Claims (9)
1. a power network line short trouble testing circuit, it is characterised in that: include for power network line occur short circuit when from
The current transformer (12) of power taking on power network line and the rectification circuit (1) being connected with the output of current transformer (12), with
And it is microprocessor (8), back discharge protection diode D1, forward discharge diode D2, DC voltage converting circuit (4), two-way
Switch (5) and super capacitor (6)；The cathode output end of described rectification circuit (1) is connected to by-pass switch (3), described rectification circuit
(1) cathode output end is connected to the current detection circuit for detecting the electric current of current transformer (12) secondary side in real time
(2), described current detection circuit (2) is connected with by-pass switch (3)；The anode of described back discharge protection diode D1 and rectification
The cathode output end of circuit (1) and by-pass switch (3) connect, the anode of described forward discharge diode D2 and two-way switch (5)
All being connected with the negative electrode of back discharge protection diode D1, the positive pole of described super capacitor (6) is connected with two-way switch (5), institute
State the minus earth of super capacitor (6), the moon of the input of described DC voltage converting circuit (4) and forward discharge diode D2
Pole connects, and the negative electrode of described forward discharge diode D2 is further connected with for entering the input voltage of DC voltage converting circuit (4)
The voltage detecting circuit (11) of row detection in real time；Being connected to wireless communication module (7) on described microprocessor (8), described electric current is examined
The output of the output of slowdown monitoring circuit (2) and voltage detecting circuit (11) is all connected with the input of microprocessor (8), described micro-
The output of processor (8) is connected to by-pass switch controlling and driving circuits (9) and two-way switch controlling and driving circuits (10), institute
The output stating by-pass switch (3) with by-pass switch controlling and driving circuits (9) is connected, described two-way switch (5) and two-way opened
The output closing controlling and driving circuits (10) connects.
2. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described rectification circuit
(1) full bridge rectifier for being made up of diode D3, diode D4, diode D5 and diode D6, described diode D3's
Negative electrode is connected with the anode of diode D4 and the first AC signal input AC1 for rectification circuit (1), described diode D6's
Negative electrode is connected with the anode of diode D5 and the second AC signal input AC2 for rectification circuit (1), described diode D4's
Negative electrode is connected with the negative electrode of diode D5 and the positive DC voltage output end V+ for rectification circuit (1), described diode D3's
Anode is connected with the anode of diode D6 and the negative DC voltage output end V-for rectification circuit (1)；Described rectification circuit (1)
One end of the secondary side with current transformer (12) for the first AC signal input AC1 be connected, the of described rectification circuit (1)
The other end of the secondary side with current transformer (12) for the two AC signal input AC2 is connected.
3. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described DC voltage
Change-over circuit (4) includes voltage conversion chip U1, polar capacitor C1 and polar capacitor C2, the input of described voltage conversion chip U1
End pin VIN is the input of DC voltage converting circuit (4) and is connected with the positive pole of polar capacitor C1, and described voltage changes core
The output pin OUT of piece U1 is the output VCC of DC voltage converting circuit (4) and is connected with the positive pole of polar capacitor C2,
The negative pole of the earth terminal pin GND of described voltage conversion chip U1, the negative pole of polar capacitor C1 and polar capacitor C2 is all grounded.
4. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described two-way switch
(5) being enhancement mode PMOS Q2, the grid of described enhancement mode PMOS Q2 is defeated with two-way switch controlling and driving circuits (10)
Going out end to connect, the positive pole of described super capacitor (6) is connected with the drain electrode of described enhancement mode PMOS Q2, described enhancement mode PMOS
The source electrode of Q2 is connected with the negative electrode of back discharge protection diode D1.
5. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described two-way switch
Controlling and driving circuits (10) includes triode VT2, resistance R3, resistance R4 and resistance R5, and one end of described resistance R5 is two-way
Switch control rule and the control signal input of drive circuit (10) and be connected with the output of microprocessor (8), described triode
The base stage of VT2 is connected with the other end of resistance R5, the grounded emitter of described triode VT2, the colelctor electrode of described triode VT2
Being connected with one end of resistance R4, the other end of described resistance R4 is the output of two-way switch controlling and driving circuits (10), and
It is connected by the negative electrode of resistance R3 and back discharge protection diode D1.
6. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described by-pass switch
(3) it is enhancement mode NMOS tube Q1, the output of the grid of described enhancement mode NMOS tube Q1 and by-pass switch controlling and driving circuits (9)
End connects, and the drain electrode of described enhancement mode NMOS tube Q1 is connected with the cathode output end of rectification circuit (1)；Described current detection circuit
(2) being made up of current sampling resistor Rs, one end of described current sampling resistor Rs connects with the source electrode of described enhancement mode NMOS tube Q1
Connecing, the other end of described current sampling resistor Rs is the output of current detection circuit (2), and the negative pole with rectification circuit (1)
Output connects.
7. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described by-pass switch
Controlling and driving circuits (9) includes triode VT1, resistance R1 and resistance R2, and one end of described resistance R1 is by-pass switch control
With the control signal input of drive circuit (9) and being connected with the output of microprocessor (8), the base stage of described triode VT1
Being connected with the other end of resistance R1, the colelctor electrode of described triode VT1 is connected with one end of resistance R2, another of described resistance R2
End is connected with the negative electrode of described forward discharge diode D2, the control of transmitting extremely by-pass switch and the driving of described triode VT1
The output of circuit (9).
8. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described microprocessor
(8) being mixed-signal processor, described wireless communication module (7) is gsm wireless communication module.
9. according to a kind of power network line short trouble testing circuit described in claim 1, it is characterised in that: described voltage detecting
Circuit (11) is made up of the resistance R6 connecting and resistance R7, the resistance R6 after series connection and one end of resistance R7 and forward electric discharge two poles
The negative electrode of pipe D2 connects, the other end ground connection of the resistance R6 after series connection and resistance R7, the connection end of described resistance R6 and resistance R7
Output for voltage detecting circuit (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620519512.3U CN205679717U (en) | 2016-05-31 | 2016-05-31 | A kind of power network line short trouble testing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620519512.3U CN205679717U (en) | 2016-05-31 | 2016-05-31 | A kind of power network line short trouble testing circuit |
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| CN205679717U true CN205679717U (en) | 2016-11-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093674A (en) * | 2016-05-31 | 2016-11-09 | 西安科技大学 | Use short circuit current self-powered electric network fault detection device and method |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN111551873A (en) * | 2020-06-15 | 2020-08-18 | 浙江中医药大学附属第三医院 | Open circuit detection method for electrical stimulation output of percutaneous/percutaneous needle |
| 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 |
-
2016
- 2016-05-31 CN CN201620519512.3U patent/CN205679717U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093674A (en) * | 2016-05-31 | 2016-11-09 | 西安科技大学 | Use short circuit current self-powered electric network fault detection device and method |
| CN106093674B (en) * | 2016-05-31 | 2019-04-05 | 西安科技大学 | Using the self-powered electric network fault detection device of short circuit current and method |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
| CN111551873A (en) * | 2020-06-15 | 2020-08-18 | 浙江中医药大学附属第三医院 | Open circuit detection method for electrical stimulation output of percutaneous/percutaneous needle |
| CN111551873B (en) * | 2020-06-15 | 2022-06-28 | 浙江中医药大学附属第三医院 | Open circuit detection method for electrical stimulation output of percutaneous/percutaneous needle |
| 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 |
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