CN112748365A - Device and method for monitoring electric leakage position of street lamp cable - Google Patents
Device and method for monitoring electric leakage position of street lamp cable Download PDFInfo
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- CN112748365A CN112748365A CN202110011407.4A CN202110011407A CN112748365A CN 112748365 A CN112748365 A CN 112748365A CN 202110011407 A CN202110011407 A CN 202110011407A CN 112748365 A CN112748365 A CN 112748365A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a device and a method for monitoring the electric leakage position of a street lamp cable.
Description
Technical Field
The invention relates to a device for monitoring fault positions of street lamp cable leakage and judgment.
Background
With the new construction, extension and reconstruction of the urban street lamp lighting system, the street lamps and related supporting facilities are increased, and the phenomenon of cable leakage is caused by the continuous occurrence of aging or artificial damage of the street lamp cable, so that the workload of daily maintenance of the street lamp cable by a street lamp management unit is gradually increased. At present, a leakage protector is installed in each loop in a street lamp power distribution cabinet, if a certain loop leaks electricity, street lamp maintenance personnel know that a cable of the loop breaks down after patrolling and finding the loop after the leakage protector acts, but can not accurately judge which specific position of the cable breaks down, and the workload of troubleshooting the cable faults is increased invisibly.
Disclosure of Invention
The invention provides a monitoring device for a street lamp cable leakage position, which can accurately judge the leakage position.
The technical scheme adopted by the invention is as follows:
the utility model provides a monitoring devices of street lamp cable electric leakage position which characterized in that: the device comprises an electric quantity acquisition chip circuit U1, a microcontroller chip U2, a communication circuit formed by U3 and U4, a cable current detection circuit P1 and a software downloading interface circuit P2;
electric quantity acquisition circuit: a connecting terminal of a cable current detection circuit P1 is respectively connected with outputs of secondary sides of cable phase A, phase B and phase C current transformers, meanwhile pins 1 and 2 of a P1 are connected with a primary side of a phase A current transformer CT1, resistors R3 and R4 which are mutually connected in series are connected between the secondary sides of the phase A current transformer CT1 in parallel, the middles of the resistors R3 and R4 are grounded, a resistor R1 series capacitor C1 is connected in parallel with two ends of a resistor R3, a resistor R2 and a capacitor C2 are connected in series and then connected in parallel with two ends of a resistor R4, a middle lead of the resistor R1 and a capacitor C1 which are connected in series is connected to a pin 3 of an electric quantity acquisition chip circuit U1, a middle lead of the resistor R2 and the capacitor C2 which are connected in series is connected to a pin 4 of the electric quantity acquisition chip circuit U2, and a circuit consisting of the phase A phase current transformers CT2, R36; a circuit consisting of a B-phase current transformer CT2, resistors R5, R6, R7, R8, capacitors C3 and C4 is connected to pins 6 and 7 of an electric quantity acquisition chip circuit U1, so that the acquisition of B-phase current is completed; a circuit consisting of the C-phase current transformer CT3, the resistors R9, R10, R11, R12, the capacitors C5 and C6 is connected to pins 9 and 10 of the electric quantity acquisition chip circuit U1, so that the acquisition of the C-phase current is completed;
the electric connection schemes of components in the acquisition circuits of the phase A, the phase B and the phase C of the cable are the same;
the model of the electric quantity acquisition chip circuit U1 is ATT 2022E.
According to the scheme, the electric leakage monitoring device is installed below each street lamp pole, and three-phase current data of the cable and load current data corresponding to the street lamp poles are detected and uploaded to a street lamp management system; and finally, the accurate position of the leakage fault is judged by analyzing and calculating the street lamp management system, and the problem of quickly positioning the cable leakage fault position is finally solved.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a monitoring device which can accurately judge the specific position of the electric leakage of a cable when the electric leakage of a street lamp cable occurs, and is convenient for a street lamp maintenance unit to timely and efficiently solve the problem of the electric leakage of the cable.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a schematic diagram of a calculation of a cable leakage position; in fig. 2, there is a street lamp control cabinet 10, where 1#2# 3.. n # is a street lamp post controlled by the street lamp control cabinet, where n # is an endmost lamp post, and 123.. n is a cable leakage position monitoring device installed below the street lamp post, respectively;
fig. 3 is a functional block diagram of the present invention.
Detailed Description
Example 1
With reference to fig. 1, the monitoring device for the electric leakage position of the street lamp cable provided by the invention comprises an electric quantity acquisition chip circuit U1, a communication circuit composed of a microcontroller chip U2, a microcontroller chip U3 and a microcontroller chip U4, a cable current detection circuit P1 and a software download interface circuit P2;
electric quantity acquisition circuit: a connecting terminal of a cable current detection circuit P1 is respectively connected with outputs of secondary sides of cable phase A, phase B and phase C current transformers, meanwhile pins 1 and 2 of a P1 are connected with a primary side of a phase A current transformer CT1, resistors R3 and R4 which are mutually connected in series are connected between the secondary sides of the phase A current transformer CT1 in parallel, the middles of the resistors R3 and R4 are grounded, a resistor R1 series capacitor C1 is connected in parallel with two ends of a resistor R3, a resistor R2 and a capacitor C2 are connected in series and then connected in parallel with two ends of a resistor R4, a middle lead of the resistor R1 and a capacitor C1 which are connected in series is connected to a pin 3 of an electric quantity acquisition chip circuit U1, a middle lead of the resistor R2 and the capacitor C2 which are connected in series is connected to a pin 4 of the electric quantity acquisition chip circuit U2, and a circuit consisting of the phase A phase current transformers CT2, R36; a circuit consisting of a B-phase current transformer CT2, resistors R5, R6, R7, R8, capacitors C3 and C4 is connected to pins 6 and 7 of an electric quantity acquisition chip circuit U1, so that the acquisition of B-phase current is completed; a circuit consisting of the C-phase current transformer CT3, the resistors R9, R10, R11, R12, the capacitors C5 and C6 is connected to pins 9 and 10 of the electric quantity acquisition chip circuit U1, so that the acquisition of the C-phase current is completed;
the electric connection schemes of components in the acquisition circuits of the phase A, the phase B and the phase C of the cable are the same; the same structure is adopted for the acquisition of the input current of the light pole, and the repeated description is not repeated here.
The model of the electric quantity acquisition chip circuit U1 is ATT 2022E.
The detection circuit is used for detecting the leakage current of the load loop and is connected with the microcontroller. The microcontroller is connected with the communication circuit and is used for communicating with the upper computer platform.
The device is arranged below each street lamp post when in use, the device detects the three-phase current data of the cable and the load current data corresponding to the street lamp posts and uploads the three-phase current data and the load current data to the street lamp management system, and the accurate position of the leakage fault is finally judged through the analysis and calculation of the street lamp management system, so that the problem of quickly positioning the leakage fault position of the cable is finally solved.
The preferred scheme is that a 1-pin series pull-up resistor R18 of an electric quantity acquisition chip circuit U1 is connected with a 3.3v power supply, and a 1-pin series capacitor C18 is grounded; the 5 pin is connected with two capacitors C19 and C20 which are connected in parallel and then grounded; the 12 pins are connected with a 3.3v power supply, and then connected with two capacitors C7 and C8 which are connected in parallel and then grounded; the pin 18 is connected with a 3.3v power supply, then connected with a capacitor C9 and then grounded; a pin 34 is connected with a 3.3v power supply, and then three capacitors C10, C11 and C12 which are connected in parallel are connected and then grounded; 35. the four pins 36, 37 and 38 are respectively connected with the four pins 14, 15, 16 and 17 of the microcontroller chip U2, and the four signals of SPI _ CS, SPI _ MOSI, SPI _ MISO and SPI _ SCK complete the transmission of the collected data; the pin 39 is connected with two capacitors C13 and C14 which are connected in parallel and then is grounded; the pin 40 is connected with the pin 29 of the microcontroller chip U2 after being connected with the pin R17 in series; a pin 41 is connected with a 3.3v power supply and is connected with C15 in series and then is grounded; 42. the pin 43 is connected with a crystal oscillator Y1 in parallel, and simultaneously, the pins C16 and C17 are respectively connected with the pins 42 and 43 and then grounded; pins 8, 11, 15, 23, 24, 32, 33 and 44 of the electric quantity acquisition chip circuit U1 are directly grounded; the model of the controller chip U2 is STM32F030C8T 6.
The further scheme is as follows: pins 1, 9, 24, 36 and 48 of the microcontroller chip U2 are connected with a 3.3v power supply and grounded through a connecting capacitor C24; 8. 23, 35, 47 are directly grounded; 5. an oscillating circuit formed by connecting a pin 6 with Y2, C21 and C22; the 7-pin connecting resistor R24 and the capacitor C23 are respectively connected to a 3.3v power supply and ground; 30. 31 are respectively connected to the 3 and 2 pins of the chip U3 to complete communication; the rear part of the 33-pin series resistor R20 is connected with a 14-pin of the wireless communication chip U4, so that the configuration of the address information of the wireless communication chip U4 is realized, and the wireless communication chip U4 is Zigbee; 7. the three pins 34 and 37 are respectively connected to the 2, 3 and 4 pins of the P2 element to realize the function of software downloading; pin 44 connecting resistor R23 to ground; the remaining pins of the microcontroller chip U2 are floating.
Preferably, pins 1 and 4 of the communication isolation chip U3 are respectively connected with a 3.3v power supply and ground; 8. the 5 pins are respectively connected with an isolated 5v power supply and the ground; 6. the 7 pins are respectively connected with the 22 pins and the 23 pins of the wireless communication chip U4 after being connected with resistors R21 and R22 in series; the model of the communication isolation chip U3 is ADUM 1201.
The communication mode is selected by connecting pins 21 and 20 of the wireless communication chip U4 with an isolated 5v power supply and ground respectively, and connecting the pin 8 in series with an LED indicator lamp and a resistor R13 and then pulling up the power supply to 5 v.
The three-phase current data of the cable and the current of the load carried by the light pole are sampled according to the acquisition circuit explained in the schematic diagram. The power acquisition chip circuit U1 finishes input acquisition, transmits to the microcontroller U2 through SPI communication in the power acquisition chip circuit U1, then sends to the communication isolation chip U3 through the serial port, and finally sends to the host computer platform storage through the wireless communication chip U4.
Example 2
How to judge the leakage position of the electric quantity acquired by the scheme is briefly described in the following with reference to fig. 2:
a method for monitoring a leakage position of a street lamp cable comprises a street lamp control cabinet 10, wherein 1#2# 3.. n # is a street lamp post of a loop of the street lamp control cabinet, n # is a tail end lamp post, and monitoring devices 123.. n are arranged below the corresponding street lamp posts respectively;
measuring currents I1, I2 and I3.. In of the response loads of the light poles by the monitoring devices 1, 2 and 3.. n and reporting the currents to an upper computer platform;
the monitoring device n measures the current values InA, InB and InC of the A phase, the B phase and the C phase of the cable at the position and reports the current values to the upper computer platform;
(the algebraic sum, not the vector sum, is described below)
I(n-1)A+I(n-1)B+I(n-1)C＝InA+InB+InC+I(n-1) (1)
InA+InB+InC＝I(n+1)A+I(n+1)B+I(n+1)C+In (2)
N in the formulas (1) and (2) is a natural number more than or equal to 2;
if n is 2, then
I1A+I1B+I1C＝I2A+I2B+I2C+I1 (3)
I2A+I2B+I2C＝I3A+I3B+I3C+I2 (4)
If the conditions (3) and (4) are met, determining that no electric leakage exists;
if the following equation is true
I2A+I2B+I2C＝I3A+I3B+I3C+I2+I0 (5)
I.e. I2A + I2B + I2C > I3A + I3B + I3C + I2 (5')
If the above-mentioned expression (5) or (5') is satisfied, it is determined that there is a leakage I0 between the 2 and 3 rods;
and so on.
According to the scheme, the upper computer platform analyzes and judges the received leakage current data. And if the algebraic sum of the three-phase currents detected by the detection device 1 is larger than the algebraic sum of the currents of the 1# light pole and the three-phase currents of the cable detected by the device 2, the cable between the device 1(1# light pole) and the device 2(2# light pole) is considered to have a leakage fault. And if the algebraic sum of the three-phase currents of the cable detected by the device 2 is larger than the algebraic sum of the currents of the 2# light pole and the three-phase currents of the cable detected by the device 3, the cable between the device 2 (the 2# light pole) and the device 3 (the 3# light pole) is considered to have a leakage fault.
The technical problem of accurately judging the leakage position of the street lamp cable is solved according to the process.
Claims (6)
1. The utility model provides a monitoring devices of street lamp cable electric leakage position which characterized in that: the device comprises an electric quantity acquisition chip circuit U1, a microcontroller chip U2, a communication circuit formed by U3 and U4, a cable current detection circuit P1 and a software downloading interface circuit P2;
electric quantity acquisition circuit: a connecting terminal of a cable current detection circuit P1 is respectively connected with outputs of secondary sides of cable phase A, phase B and phase C current transformers, meanwhile pins 1 and 2 of a P1 are connected with a primary side of a phase A current transformer CT1, resistors R3 and R4 which are mutually connected in series are connected between the secondary sides of the phase A current transformer CT1 in parallel, the middles of the resistors R3 and R4 are grounded, a resistor R1 series capacitor C1 is connected in parallel with two ends of a resistor R3, a resistor R2 and a capacitor C2 are connected in series and then connected in parallel with two ends of a resistor R4, a middle lead of the resistor R1 and a capacitor C1 which are connected in series is connected to a pin 3 of an electric quantity acquisition chip circuit U1, a middle lead of the resistor R2 and the capacitor C2 which are connected in series is connected to a pin 4 of the electric quantity acquisition chip circuit U2, and a circuit consisting of the phase A phase current transformers CT2, R36; a circuit consisting of a B-phase current transformer CT2, resistors R5, R6, R7, R8, capacitors C3 and C4 is connected to pins 6 and 7 of an electric quantity acquisition chip circuit U1, so that the acquisition of B-phase current is completed; a circuit consisting of the C-phase current transformer CT3, the resistors R9, R10, R11, R12, the capacitors C5 and C6 is connected to pins 9 and 10 of the electric quantity acquisition chip circuit U1, so that the acquisition of the C-phase current is completed;
the electric connection schemes of components in the acquisition circuits of the phase A, the phase B and the phase C of the cable are the same;
the model of the electric quantity acquisition chip circuit U1 is ATT 2022E.
2. The device for monitoring the leakage position of the street lamp cable according to claim 1, wherein: a 1-pin series pull-up resistor R18 of the electric quantity acquisition chip circuit U1 is connected with a 3.3v power supply, and a 1-pin series capacitor C18 is grounded; the 5 pin is connected with two capacitors C19 and C20 which are connected in parallel and then grounded; the 12 pins are connected with a 3.3v power supply, and then connected with two capacitors C7 and C8 which are connected in parallel and then grounded; the pin 18 is connected with a 3.3v power supply, then connected with a capacitor C9 and then grounded; a pin 34 is connected with a 3.3v power supply, and then three capacitors C10, C11 and C12 which are connected in parallel are connected and then grounded; 35. the four pins 36, 37 and 38 are respectively connected with the four pins 14, 15, 16 and 17 of the microcontroller chip U2, and the four signals of SPI _ CS, SPI _ MOSI, SPI _ MISO and SPI _ SCK complete the transmission of the collected data; the pin 39 is connected with two capacitors C13 and C14 which are connected in parallel and then is grounded; the pin 40 is connected with the pin 29 of the microcontroller chip U2 after being connected with the pin R17 in series; a pin 41 is connected with a 3.3v power supply and is connected with C15 in series and then is grounded; 42. the pin 43 is connected with a crystal oscillator Y1 in parallel, and simultaneously, the pins C16 and C17 are respectively connected with the pins 42 and 43 and then grounded; pins 8, 11, 15, 23, 24, 32, 33 and 44 of the electric quantity acquisition chip circuit U1 are directly grounded; the model of the controller chip U2 is STM32F030C8T 6.
3. The device for monitoring the leakage position of the street lamp cable according to claim 1 or 2, wherein: pins 1, 9, 24, 36 and 48 of the microcontroller chip U2 are connected with a 3.3v power supply and grounded through a connecting capacitor C24; 8. 23, 35, 47 are directly grounded; 5. an oscillating circuit formed by connecting a pin 6 with Y2, C21 and C22; the 7-pin connecting resistor R24 and the capacitor C23 are respectively connected to a 3.3v power supply and ground; 30. 31 are respectively connected to the 3 and 2 pins of the chip U3 to complete communication; the rear part of the 33-pin series resistor R20 is connected with a 14-pin of the wireless communication chip U4, so that the configuration of the address information of the wireless communication chip U4 is realized, and the wireless communication chip U4 is Zigbee; 7. the three pins 34 and 37 are respectively connected to the 2, 3 and 4 pins of the P2 element to realize the function of software downloading; pin 44 connecting resistor R23 to ground; the remaining pins of the microcontroller chip U2 are floating.
4. The device for monitoring the leakage position of the street lamp cable according to claim 3, wherein: pins 1 and 4 of the communication isolation chip U3 are respectively connected with a 3.3v power supply and ground; 8. the 5 pins are respectively connected with an isolated 5v power supply and the ground; 6. the 7 pins are respectively connected with the 22 pins and the 23 pins of the wireless communication chip U4 after being connected with resistors R21 and R22 in series; the model of the communication isolation chip U3 is ADUM 1201.
5. The device for monitoring the leakage position of the street lamp cable according to claim 4, wherein: the pins 21 and 20 of the wireless communication chip U4 are respectively connected with an isolated 5v power supply and the ground, and the pin 8 is connected with an LED indicator lamp and a resistor R19 in series and then pulled up to the 5v power supply.
6. A method for monitoring a leakage position of a street lamp cable comprises a street lamp control cabinet 10, wherein 1#2# 3.. n # is a street lamp pole controlled by the street lamp control cabinet, n # is a tail-end lamp pole, and monitoring devices 123.. n are arranged below the corresponding street lamp poles respectively;
the monitoring devices 1, 2 and 3.. n measure currents I1, I2 and I3.. In of corresponding loads of the light pole and report the currents to an upper computer platform;
the monitoring device n measures the current values InA, InB and InC of the A phase, the B phase and the C phase of the cable at the position and reports the current values to the upper computer platform;
I(n-1)A+I(n-1)B+I(n-1)C＝InA+InB+InC+I(n-1) (1)
InA+InB+InC＝I(n+1)A+I(n+1)B+I(n+1)C+In (2)
n in the formulas (1) and (2) is a natural number more than or equal to 2;
if n is 2, then
I1A+I1B+I1C＝I2A+I2B+I2C+I1 (3)
I2A+I2B+I2C＝I3A+I3B+I3C+I2 (4)
If the conditions (3) and (4) are met, determining that no electric leakage exists;
if the following equation is true
I2A+I2B+I2C＝I3A+I3B+I3C+I2+I0 (5)
I.e. I2A + I2B + I2C > I3A + I3B + I3C + I2 (5')
If the above-mentioned expression (5) or (5') is satisfied, it is determined that there is a leakage I0 between the 2 and 3 rods;
and so on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110011407.4A CN112748365A (en) | 2021-01-06 | 2021-01-06 | Device and method for monitoring electric leakage position of street lamp cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110011407.4A CN112748365A (en) | 2021-01-06 | 2021-01-06 | Device and method for monitoring electric leakage position of street lamp cable |
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| CN112748365A true CN112748365A (en) | 2021-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114173455A (en) * | 2021-12-03 | 2022-03-11 | 深圳市力合微电子股份有限公司 | Intelligent street lamp illumination monitoring terminal system |
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- 2021-01-06 CN CN202110011407.4A patent/CN112748365A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114173455A (en) * | 2021-12-03 | 2022-03-11 | 深圳市力合微电子股份有限公司 | Intelligent street lamp illumination monitoring terminal system |
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