CN108490313A - A kind of single-phase earth fault line selection experimental rig and method based on power distribution network - Google Patents
A kind of single-phase earth fault line selection experimental rig and method based on power distribution network Download PDFInfo
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- CN108490313A CN108490313A CN201810364631.XA CN201810364631A CN108490313A CN 108490313 A CN108490313 A CN 108490313A CN 201810364631 A CN201810364631 A CN 201810364631A CN 108490313 A CN108490313 A CN 108490313A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 17
- 230000003750 conditioning effect Effects 0.000 claims abstract description 11
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- 230000001360 synchronised effect Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The present invention proposes a kind of single-phase earth fault line selection experimental rig and method based on power distribution network, the input terminal of residual voltage current signal detection circuit described in the device is connected with the outlet side of each feeder line monitoring point, the input terminal of the output end connection synchronizing signal sample circuit of the residual voltage current signal detection circuit, the input terminal of the output end connection signal modulate circuit of the synchronizing signal sample circuit, the input terminal of the output end connection A/D signaling conversion circuits of the signal conditioning circuit, the input terminal of the output end connection DSP control chips of the A/D signaling conversion circuits, the input terminal of the output end connection RS485 communication modules of the DSP controls chip, the output end of the RS485 communication modules connects the computer；Compared with traditional selection method, this experimental rig is simple in structure, easy to operate, and algorithm is powerful, accuracy is high.
Description
Technical field
The invention belongs to technical field of electric power system control, and in particular to a kind of singlephase earth fault choosing based on power distribution network
Thread test device and method.
Background technology
When single-phase earthing occurring in neutral point indirect earthing power distribution network, due to the electric current very little of fault point, Er Qiesan
Line voltage between phase still maintains symmetrical, is not influenced on load power supply, and therefore, under normal circumstances, regulation regulation allows
It is further continued for operation 1-2 hours.The most common failure of medium voltage distribution network is singlephase earth fault.Although singlephase earth fault does not destroy
The symmetrical operation of system, but the voltage-to-ground of other two-phases is caused to increaseTimes, it is mutually exhausted that long-play easily causes non-faulting
Edge damages, and forms phase fault.Therefore, failure is further expanded into or multipoint earthing short circuit, operations staff at 2 points in order to prevent
It should take timely measure and be eliminated.
Current fault-line selecting method relies primarily on the stable state residual voltage and zero-sequence current after failure, such as than amplitude ratio phase
Method and 5 subharmonic methods etc..These methods are affected by factors such as system operation mode and fault state, are wanted in practical applications
Realizing accurate route selection, there are many difficulties.Although also there is several methods using transient signal, such as wavelet method, wavelet method choosing
The difficult point of line technology is the selection of wavelet basis function and wavelet decomposition scales, in addition, if ground resistance is excessive, transient current
High fdrequency component it is too small, easily falsely drop.Using when zero-sequence current route selection method when in zero-sequence current containing compared with strong DC component when
It is easy to bring route selection Problem of Failure since CT saturation causes wave distortion.When carrying out route selection using wavelet analysis,
With certain applicability, but it is easy to be influenced by factors such as wavelet basis function and decomposition scales.Utilize Prony piecewise fittings
Transient zero-sequence current signal determines that the model order of the algorithm is relatively difficult when realizing route selection, and the algorithm is quicker to noise
Sense.Therefore, studying more perfect line selection apparatus and method has more importantly application value.
Invention content
In view of the deficiencies of the prior art, the present invention proposes a kind of single-phase earth fault line selection experimental rig based on power distribution network
And method.
A kind of single-phase earth fault line selection experimental rig based on power distribution network, including detecting signal unit and monitoring unit；
The detecting signal unit, including：Residual voltage current signal detection circuit, synchronizing signal sample circuit, signal
Modulate circuit, A/D conversion circuits and DSP control chip；
The monitoring unit, including RS485 communication modules and computer；
The input terminal of the residual voltage current signal detection circuit is connected with the outlet side of each feeder line monitoring point, institute
The input terminal of the output end connection synchronizing signal sample circuit of residual voltage current signal detection circuit is stated, the synchronizing signal is adopted
The output end connection A/D signals of the input terminal of the output end connection signal modulate circuit of sample circuit, the signal conditioning circuit turn
Change the input terminal of circuit, the input terminal of the output end connection DSP control chips of the A/D signaling conversion circuits, the DSP controls
The input terminal of the output end connection RS485 communication modules of chip, the output end of the RS485 communication modules connect the calculating
Machine；
TensorFlow environment is built in the computer, for according to each feeder line monitoring point for being transmitted to computer
Residual voltage signal and zero sequence current signal obtain corresponding logical relation value using Softmax regression algorithms, and set each item
The logical relation threshold value of feeder line, by judging whether the logical relation value of each feeder line monitoring point exceeds its logical relation threshold value,
So that it is determined that the fault condition of each feeder line monitoring point.
The residual voltage current signal detection circuit, including first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the first operational amplifier, AC power, 5V DC power supplies；
One end of the AC power anode and first resistor, second resistance one end connection, the first resistor it is another
One end is connected with the negative input end of one end of 3rd resistor, the first operational amplifier, the other end of the 3rd resistor and first
The output end of operational amplifier is connected, positive input terminal, the alternating current of the other end of the second resistance and the first operational amplifier
The anode in source, one end of the 4th resistance, one end of the 5th resistance are connected, the other end and the 5V DC power supplies of the 4th resistance
The negative output terminal connection of anode, the first operational amplifier, the other end of the 5th resistance are connected with the cathode of 5V DC power supplies.
The method that failure line selection experiment is carried out using the single-phase earth fault line selection experimental rig based on power distribution network, including with
Lower step：
Step 1：The residual voltage letter of each feeder line monitoring point is acquired by the residual voltage current signal detection circuit
Number and zero sequence current signal, be transmitted to the synchronizing signal sample circuit；
Step 2：Residual voltage signal and zero sequence current signal be transmitted to by the synchronizing signal sample circuit described
Signal conditioning circuit；
Step 3：Residual voltage signal and zero sequence current signal are transmitted to A/D conversion electricity by the signal conditioning circuit
Road；
Step 4：Residual voltage signal and zero sequence current signal are converted into digital signal by A/D conversion circuits, and passed
DSP control chips are transported to, and chip is controlled by the residual voltage signal of detected each feeder line monitoring point and zero sequence electricity by DSP
Stream signal is sent to computer；
Step 5：By computer according to the residual voltage signal and zero sequence of each feeder line monitoring point for being transmitted to computer
Current signal obtains corresponding logical relation value using Softmax regression algorithms；
Step 6：By the logical relation threshold value of each feeder line of computer settings, judges that each feeder line monitoring point is corresponding and patrol
Collect whether relation value exceeds its corresponding logical relation threshold value, if so, judging this feeder line, there are failures, otherwise, this feedback
Line is working properly, and stores judgement result.
Beneficial effects of the present invention：
The present invention proposes a kind of single-phase earth fault line selection experimental rig and method based on power distribution network, with traditional route selection
Method is compared, this experimental rig is simple in structure, easy to operate, and algorithm is powerful, accuracy is high.It can be filled using Softmax algorithms
Divide the circuit for accurately detecting that singlephase earth fault occurs.First in this experiment to the signal deteching circuit of each electrical quantity compared with
To be simple, the electrical quantity collected is sent in DSP control chips using signal deteching circuit；It followed by operates more simple
It is single, data mining is carried out to characteristic quantity under TensorFlow environment, carrying out each circuit using Softmax regression algorithms occurs
The case where singlephase earth fault, carries out classification based training, obtains corresponding logical relation, this logical relation algorithm is sent in DSP
And singlephase earth fault may be occurred to each circuit, corresponding threshold value is set, when singlephase earth fault that circuit occurs, communicates mould
Block quickly can be shown and be reminded；It is finally accuracy height, single-phase connect is occurred to each circuit using Softmax regression algorithms
The case where earth fault, accurately classify, detects.
Description of the drawings
Fig. 1 is that the structure of the single-phase earth fault line selection experimental rig based on power distribution network in the specific embodiment of the invention is shown
It is intended to；
Fig. 2 is the circuit diagram of residual voltage current signal detection circuit in the specific embodiment of the invention；
Fig. 3 is the circuit diagram of synchronizing signal sample circuit in the specific embodiment of the invention；
Fig. 4 is the circuit diagram of signal conditioning circuit in the specific embodiment of the invention；
Fig. 5 is the interface circuit figure of A/D conversion chips AD7656 and TMS320F2812 in the specific embodiment of the invention；
Fig. 6 is the circuit diagram of RS485 communication modules in the specific embodiment of the invention；
Fig. 7 is the flow of the single-phase earth fault line selection test method based on power distribution network in the specific embodiment of the invention
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes.
A kind of single-phase earth fault line selection experimental rig based on power distribution network, as shown in Figure 1, including detecting signal unit and
Monitoring unit.
The detecting signal unit, including：Residual voltage current signal detection circuit, synchronizing signal sample circuit, signal
Modulate circuit, A/D conversion circuits and DSP control chip.
The monitoring unit, including RS485 communication modules and computer.
The input terminal of the residual voltage current signal detection circuit is connected with the outlet side of each feeder line monitoring point, institute
The input terminal of the output end connection synchronizing signal sample circuit of residual voltage current signal detection circuit is stated, the synchronizing signal is adopted
The output end connection A/D signals of the input terminal of the output end connection signal modulate circuit of sample circuit, the signal conditioning circuit turn
Change the input terminal of circuit, the input terminal of the output end connection DSP control chips of the A/D signaling conversion circuits, the DSP controls
The input terminal of the output end connection RS485 communication modules of chip, the output end of the RS485 communication modules connect the calculating
Machine；
TensorFlow environment is built in the computer, for according to each feeder line monitoring point for being transmitted to computer
Residual voltage signal and zero sequence current signal obtain corresponding logical relation value using Softmax regression algorithms, and set each item
The logical relation threshold value of feeder line, by judging whether the logical relation value of each feeder line monitoring point exceeds its logical relation threshold value,
So that it is determined that the fault condition of each feeder line monitoring point.
The residual voltage current signal detection circuit, as shown in Fig. 2, including first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4, the 5th resistance R5, the first operational amplifier A1, AC power, 5V DC power supplies.
The AC power anode and first resistor R1One end, second resistance R2One end connection, the first resistor R1
The other end and 3rd resistor R3One end, the first operational amplifier A1Negative input end be connected, the 3rd resistor R3It is another
End and the first operational amplifier A1Output end be connected, the second resistance R2The other end and the first operational amplifier A1Just
Input terminal, the anode of AC power, the 4th resistance R4One end, the 5th resistance R5One end be connected, the 4th resistance R4It is another
The anode of one end and 5V DC power supplies, the first operational amplifier A1Negative output terminal connection, the 5th resistance R5The other end with
The cathode of 5V DC power supplies is connected.
The synchronizing signal sample circuit, as shown in figure 3, including second operational amplifier A2, third operational amplifier A3、
6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the first capacitance C1, the second capacitance C2And
Third capacitance C3。
The second operational amplifier A2Negative input end be connected with its output end, the second operational amplifier A2's
Positive input terminal and the 6th resistance R6One end, the first capacitance C1One end be connected, the first capacitance C1The other end ground connection,
The 6th resistance R6The other end be synchronizing signal sample circuit input terminal；The output end connection the of second operational amplifier
Seven resistance R7One end, the 7th resistance R7The other end connect the second capacitance C2One end, the 9th resistance R9One end and
Three operational amplifier As3Positive input terminal, the second capacitance C2The other end ground connection, the 9th resistance R9The other end connect third operation
Amplifier A3Output end, third operational amplifier A3Negative input end connect the 8th resistance R8One end, the 8th resistance R8
The other end ground connection；Third operational amplifier A3Output end connect the tenth resistance R10With third capacitance C3One end, the tenth electricity
Hinder R10The other end connect power supply, third capacitance C3The other end ground connection, third operational amplifier A3Output end be synchronous to believe
The output end of number sample circuit.
The signal conditioning circuit, as shown in figure 4, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13,
14 resistance R14, the 15th resistance R15, the 16th resistance R16, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the one or two
Pole pipe D1, the second diode D2, third diode D3, the four or two pole D4, the 5th diode D5, triode NPN and 555 timers.
The first diode D1Cathode and the second diode D2Cathode, the 4th capacitance C4One end, eleventh resistor
R11One end, thirteenth resistor R13One end, 4,8 pins of 555 timers, triode NPN emitter be connected, described the
One diode D1Anode with third diode D3Cathode be connected, the second diode D2Anode with the 4th diode D4
Cathode be connected, the third diode D3Anode with the 4th diode D4Anode, the 4th capacitance C4The other end, the 5th
Capacitance C5One end, the 6th capacitance C6One end, the 16th resistance R16One end, 555 timers the 1st pin be connected, it is described
Eleventh resistor R11With twelfth resistor R16, 555 timers the 7th pin be connected, 555 timer the 2nd, 6 pins it is same
When with twelfth resistor R16The other end, the 5th capacitance C5The other end be connected, the thirteenth resistor R13The other end and
14 resistance R14One end be connected, the 14th resistance R14The other end be connected with the 3rd pin of timer, described 555 is fixed
When device the 5th pin and the 6th capacitance C6The other end be connected, the collector and the 15th resistance R of the triode NPN15's
One end connects, the 15th resistance R15The other end and eleventh resistor R11The other end, the 5th diodes in parallel exists
16th resistance R16Both ends.
The A/D conversion circuits include three A/D conversion chips, and three A/D conversion chips cascade；The A/D of selection turns
It is AD7656 to change chip model, and the synchronous acquisition of six road signals may be implemented in every AD7656 chip, and three pieces AD7656 chips can
The synchronous acquisition for realizing 18 road signals realizes the function of analog to digital conversion circuit, and transformed digital signal is sent to
DSP。
In present embodiment, DSP controls the model TMS320F2812, DSP that chip uses and controls chip for described
The digital signal for each electric parameter that A/D conversion circuits are sent is acquired and calculates.
It is illustrated in figure 5 the interface circuit figure of A/D conversion chips AD7656 and TMS320F2812, the VDR of AD7656,
RST, CON [ABC], RD, CS, BUSY pin are separately connected DVDD, ADC-RST, PWM1, RE, IS, INT1_ of TMS320F2812
BIO pins, D0~D15 pins of D [0]~D [15] pin connection TMS320F2812 of AD7656, the DGND pins of AD7656
Connect the V of TMS320F2812SSPin is simultaneously grounded, and WR, STDBY pin of AD7656 is connected with+3.3V power supplys, AD7656's
H/SSEL, SER, RANGE, W/B pin are connected and are grounded.
The circuit diagram of the RS485 communication modules, as shown in fig. 6, including the 7th capacitance C7, the 8th capacitance C8,
Nine capacitance C9, the 5th diode D5, the 6th diode D6, the 17th resistance R17, communication chip SP3485E.
The 8th pin and the 7th capacitance C of the communication chip SP3485E7One end be connected, the 7th capacitance C7It is another
End is connected to the ground, the 7th pin and the 5th diode D of the communication chip SP3485E5Cathode, the 17th resistance R17One
End, the 8th capacitance C8One end be connected, the 5th diode D5Anode and the 8th capacitance C8Other end one end, be connected, institute
State the 6th pin and the 17th resistance R of communication chip SP3485E17The other end, the 6th diode D6Cathode, the 9th capacitance
C9One end be connected, the 6th diode D6The other end and the 9th capacitance C9Anode be connected.
The method that failure line selection experiment is carried out using the single-phase earth fault line selection experimental rig based on power distribution network, such as Fig. 7
It is shown, include the following steps：
Step 1：The residual voltage letter of each feeder line monitoring point is acquired by the residual voltage current signal detection circuit
Number and zero sequence current signal, be transmitted to the synchronizing signal sample circuit；
Step 2：Residual voltage signal and zero sequence current signal be transmitted to by the synchronizing signal sample circuit described
Signal conditioning circuit；
Step 3：Residual voltage signal and zero sequence current signal are transmitted to A/D conversion electricity by the signal conditioning circuit
Road；
Step 4：Residual voltage signal and zero sequence current signal are converted into digital signal by A/D conversion circuits, and passed
DSP control chips are transported to, and chip is controlled by the residual voltage signal of detected each feeder line monitoring point and zero sequence electricity by DSP
Stream signal is sent to computer；
Step 5：By computer according to the residual voltage signal and zero sequence of each feeder line monitoring point for being transmitted to computer
Current signal obtains corresponding logical relation value using Softmax regression algorithms；
Step 6：By the logical relation threshold value of each feeder line of computer settings, judges that each feeder line monitoring point is corresponding and patrol
Collect whether relation value exceeds its corresponding logical relation threshold value, if so, judging this feeder line, there are failures, otherwise, this feedback
Line is working properly, and stores judgement result.
Claims (3)
1. a kind of single-phase earth fault line selection experimental rig based on power distribution network, which is characterized in that including detecting signal unit and
Monitoring unit；
The detecting signal unit, including：Residual voltage current signal detection circuit, synchronizing signal sample circuit, signal condition
Circuit, A/D conversion circuits and DSP control chip；
The monitoring unit, including RS485 communication modules and computer；
The input terminal of the residual voltage current signal detection circuit is connected with the outlet side of each feeder line monitoring point, and described zero
The input terminal of the output end connection synchronizing signal sample circuit of sequence voltage current signal detection circuit, the synchronizing signal sampling electricity
The input terminal of the output end connection signal modulate circuit on road, the output end connection A/D signals conversion electricity of the signal conditioning circuit
The input terminal on road, the input terminal of the output end connection DSP control chips of the A/D signaling conversion circuits, the DSP control chip
Output end connection RS485 communication modules input terminal, the output ends of the RS485 communication modules connects the computer；
TensorFlow environment is built in the computer, for the zero sequence according to each feeder line monitoring point for being transmitted to computer
Voltage signal and zero sequence current signal obtain corresponding logical relation value using Softmax regression algorithms, and set each feeder line
Logical relation threshold value, by judge each feeder line monitoring point logical relation value whether exceed its logical relation threshold value, to
Determine the fault condition of each feeder line monitoring point.
2. the single-phase earth fault line selection experimental rig according to claim 1 based on power distribution network, which is characterized in that described
Residual voltage current signal detection circuit, including first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
One operational amplifier, AC power, 5V DC power supplies；
One end connection of one end of the AC power anode and first resistor, second resistance, the other end of the first resistor
It is connected with the negative input end of one end of 3rd resistor, the first operational amplifier, the other end of the 3rd resistor and the first operation
The output end of amplifier is connected, the positive input terminal of the other end of the second resistance and the first operational amplifier, AC power
Anode, one end of the 4th resistance, one end of the 5th resistance are connected, and the other end and 5V DC power supplies of the 4th resistance are just
The negative output terminal connection of pole, the first operational amplifier, the other end of the 5th resistance are connected with the cathode of 5V DC power supplies.
3. carrying out failure line selection experiment using the single-phase earth fault line selection experimental rig described in claim 1 based on power distribution network
Method, which is characterized in that include the following steps：
Step 1：By the residual voltage current signal detection circuit acquire each feeder line monitoring point residual voltage signal and
Zero sequence current signal is transmitted to the synchronizing signal sample circuit；
Step 2：Residual voltage signal and zero sequence current signal are transmitted to the signal by the synchronizing signal sample circuit
Modulate circuit；
Step 3：Residual voltage signal and zero sequence current signal are transmitted to A/D conversion circuits by the signal conditioning circuit；
Step 4：Residual voltage signal and zero sequence current signal are converted into digital signal by A/D conversion circuits, and are transmitted to
DSP controls chip, and controls chip by DSP and believe the residual voltage signal of detected each feeder line monitoring point and zero-sequence current
Number it is sent to computer；
Step 5：By computer according to the residual voltage signal and zero-sequence current of each feeder line monitoring point for being transmitted to computer
Signal obtains corresponding logical relation value using Softmax regression algorithms；
Step 6：By the logical relation threshold value of each feeder line of computer settings, judge that the corresponding logic in each feeder line monitoring point is closed
Whether set occurrence exceeds its corresponding logical relation threshold value, if so, judging this feeder line, there are failures, otherwise, this feeder line work
Make normally, and stores judgement result.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406534A (en) * | 2021-06-15 | 2021-09-17 | 云南拓洲科技有限公司 | Power distribution network airborne line fault simulation experiment system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022216A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Small earthing current electric network single phase fault wire selecting method and apparatus |
| WO2014089899A1 (en) * | 2012-12-10 | 2014-06-19 | 国家电网公司 | Distribution network phase-to-earth fault location method and location device based on transient signal wavelet transformation |
| CN106291234A (en) * | 2016-07-29 | 2017-01-04 | 武汉大学 | A kind of transmission line of electricity internal fault external fault based on convolutional neural networks judges and fault phase-selecting method |
-
2018
- 2018-04-23 CN CN201810364631.XA patent/CN108490313A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022216A (en) * | 2007-02-07 | 2007-08-22 | 燕山大学 | Small earthing current electric network single phase fault wire selecting method and apparatus |
| WO2014089899A1 (en) * | 2012-12-10 | 2014-06-19 | 国家电网公司 | Distribution network phase-to-earth fault location method and location device based on transient signal wavelet transformation |
| CN106291234A (en) * | 2016-07-29 | 2017-01-04 | 武汉大学 | A kind of transmission line of electricity internal fault external fault based on convolutional neural networks judges and fault phase-selecting method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406534A (en) * | 2021-06-15 | 2021-09-17 | 云南拓洲科技有限公司 | Power distribution network airborne line fault simulation experiment system |
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Application publication date: 20180904 |