CN209945426U - Low-voltage distribution line shunt monitoring device - Google Patents
Low-voltage distribution line shunt monitoring device Download PDFInfo
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- CN209945426U CN209945426U CN201921018263.XU CN201921018263U CN209945426U CN 209945426 U CN209945426 U CN 209945426U CN 201921018263 U CN201921018263 U CN 201921018263U CN 209945426 U CN209945426 U CN 209945426U
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Abstract
The utility model discloses a low pressure distribution lines is monitoring devices along separate routes and monitoring method thereof, this monitoring devices include upper cover and lower cover, the upper cover passes through the axis of rotation and is connected with the lower cover, and the upper cover can be followed this axis of rotation and opened and closed install respectively in the position groove of upper cover and lower cover and get electric coil and current measurement coil, all be provided with the elasticity copper sheet that is used for voltage detection on getting electric coil and the current measurement coil, still be provided with the main control circuit board in the lower cover, the main control circuit board includes main control MCU and gets electric management circuit and voltage detection circuit connection with the main control MCU electricity is connected, main control MCU passes through the AD port and gets electric coil and current measurement coil electricity and is connected. The utility model discloses possess simple structure, adopt non-contact collection response to get electric, electric current, voltage, temperature detection in monitoring devices of an organic whole, need not follow distribution lines access line or outer power supply, when protection monitoring personnel's safety, the installation is swift, easy operation, and is with low costs.
Description
Technical Field
The utility model relates to an electric power thing networking application technology field specifically is a low pressure distribution lines monitoring devices along separate routes.
Background
The intelligent low-voltage shunt monitoring device is mainly installed on low-voltage distribution cables of an opening and closing station, a ring main unit and a distribution transformer low-voltage chamber, is suitable for electric quantity monitoring and fault detection of a 400V line, can collect information such as running current, voltage and cable skin temperature of the low-voltage line, calculates active and reactive power of the line, can detect line fault current when the line fails, gives a fault alarm, and achieves low-voltage power grid information management and active emergency maintenance service.
At present, a low-voltage shunt monitoring device converts 380V or 220V of a distribution line into low-voltage direct-current voltage through a power supply module to supply power for a monitoring unit or supply power externally. The voltage detection needs to access the monitoring unit from the distribution line, and then the analog-digital conversion detection is carried out after the signal is reduced through resistance-capacitance voltage division or a transformer. Power supply and voltage detection all need insert the distribution lines, need the distribution lines cable to have naked dew point or binding post, greatly reduced manual operation's security increases unreliability, and it is not convenient enough to install.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low pressure distribution lines monitoring devices along separate routes and monitoring method thereof possesses simple structure, adopts non-contact's collection response to get electric current and electric current, voltage, temperature detection in the monitoring devices of an organic whole, need not follow distribution lines access line or outer power supply, and the installation is swift moreover, and operation safety, reduce cost's advantage has solved the problem that above-mentioned technical background proposed.
In order to achieve the above object, the utility model provides a following technical scheme: a low-voltage distribution line shunt monitoring device comprises an upper cover and a lower cover, wherein the upper cover consists of a left upper cover and a right upper cover, the lower cover consists of a left lower cover and a right lower cover, the upper cover is connected with the lower cover through a rotating shaft, the upper cover can be opened and closed along the rotating shaft, a semicircular potential groove is formed in each of the left upper cover, the right upper cover, the left lower cover and the right lower cover, a power taking coil is installed in the potential groove of each of the left upper cover and the left lower cover, a current measuring coil is installed in the potential groove of each of the right upper cover and the right lower cover, elastic copper sheets for voltage detection are arranged on each of the power taking coil and the current measuring coil, a main control circuit board is further arranged in the lower cover, the main control circuit board comprises a main control MCU and a power taking management circuit and a voltage detection circuit which are electrically connected with the power taking coil and the current measuring coil through an AD port, the main control MCU is an STM32L053MCU singlechip.
Preferably, a hook is arranged right in front of the upper cover, and a hasp matched with the hook is arranged on the lower cover.
Preferably, get electric coil and current measurement coil interval setting, and get and still be equipped with infrared temperature sensor between electric coil and the current measurement coil, infrared temperature sensor is connected with the main control circuit board electricity.
Preferably, the current measuring coil is an open type current transformer made of nanocrystalline materials.
Preferably, the power-taking management circuit comprises a power-taking coil input terminal P1, a bridge rectifier consisting of four diodes D1, D2, D3 and D4, a boost power management chip U1 and a comparator U3, the power-taking coil input terminal P1 is connected with the power-taking coil, one end of the power-taking coil input terminal P1, which is far away from the power-taking coil, is connected with two alternating current input ends of the bridge rectifier, a direct current output end of the bridge rectifier is respectively connected with an N-channel MOS transistor Q2 and a resistor R2, the other end of the resistor R2 is connected with a pin 1 of the P-channel MOS transistor Q1, and charging and discharging of the super capacitor C1 are controlled; a No. 1 pin of the boosting power supply management chip U1 is connected with a No. 4 pin of an N-channel MOS tube Q2 after passing through a P-channel MOS tube Q3, a triode Q4 and a resistor R7, and controls the conduction and the closing of the N-channel MOS tube Q2; the No. 1 port of the comparator U3 is connected with the No. 1 pin of the P-channel MOS tube Q1 through a resistor R8 and a resistor R9, the No. 7 pin of the comparator U3 is connected with the P-channel MOS tube Q3, and the voltage threshold of the conduction of the P-channel MOS tube Q1 and the P-channel MOS tube Q3 is set through a comparator U3.
Preferably, the voltage detection circuit comprises a parasitic capacitor access end P2, one end of the parasitic capacitor access end P2 is connected with a parasitic capacitor existing between the cable and the elastic copper sheet, the other end of the parasitic capacitor access end P2 forms a CC filter circuit and a CRR filter circuit through a capacitor C13 and a resistor R23/R21 respectively, and then the other end of the parasitic capacitor access end P2 is input to instrumentation amplifiers U7 and U6 through operational amplifiers U11 and U5 respectively for amplification, and is input to an AD port of the main control MCU through an RC low pass filter for AD conversion.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the utility model discloses a setting is got electric coil, current measurement coil, elastic copper sheet and infrared temperature sensor, should get electric coil, current measurement coil, elastic copper sheet and infrared temperature sensor and all be connected with main control MCU, reach and need not to follow distribution lines access line or external power supply, alright realize the current value, the magnitude of voltage and the cable skin table temperature of contactless intelligent monitoring cable to calculate useful power, useless power, power factor etc. judge the circuit trouble, convenient and practical, the security is good.
2. The utility model discloses a be provided with the couple in the place ahead of the upper cover, cover under and be provided with the hasp of couple looks adaptation, the hasp uses with the couple cooperation, when monitoring the cable, installs swiftly, and operation safety, and reduce cost.
3. The utility model discloses a setting is used for pressing from both sides the elasticity copper sheet of getting the cable, this elasticity copper sheet be fit for with the cable of different external diameters, and can let the effectual cable epidermis of elasticity copper sheet laminate mutually, and elasticity copper sheet laminating cable can improve the parasitic capacitance value of voltage detection to improve the precision of voltage detection, increase the interference killing feature.
4. The utility model discloses utilize parasitic capacitance rationale, carry out non-contact voltage detection through topology or the topological transform of difference, master control MCU passes through AD port detection voltage signal and calculates the cable voltage through the algorithm, realizes the most genuine contactless.
5. The utility model discloses a setting is got electric administrative circuit, and this is got electric administrative circuit and will get the alternating current that electric coil acquireed and integrate into the direct current to supply main control MCU and back stage circuit to use with voltage reduction, protection low pressure distribution lines monitoring devices along separate routes is not damaged by the high pressure.
Drawings
Fig. 1 is an exploded view of a low-voltage distribution line shunt monitoring device according to the present invention;
fig. 2 is one of the structural diagrams of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 3 is a second structural diagram of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 4 is a schematic block diagram of a main control MCU of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 5 is a circuit diagram of a power-taking management circuit of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 6 is a schematic voltage detection diagram of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 7 is a circuit diagram of a voltage detection circuit of the low-voltage distribution line shunt monitoring device of the present invention;
fig. 8 is a schematic diagram of a topology circuit for detecting the voltage of the low-voltage distribution line shunt monitoring device according to the present invention;
fig. 9 is a circuit diagram of a topology circuit of fig. 8 according to the present invention.
The reference numerals and names in the figures are as follows:
1. an upper cover; 11. a left upper cover; 12. a right upper cover; 2. a lower cover; 21. a left lower cover; 22. a right lower cover; 3. a rotating shaft; 4. hooking; 5. a hasp; 6. a position groove; 7. taking a power coil; 8. a current measuring coil; 9. an elastic copper sheet; 10. a main control circuit board; 13. an infrared temperature sensor; 14. a main control MCU; 15. a power-taking management circuit; 16. a voltage detection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 5 and fig. 7, the present invention provides an embodiment: a low-voltage distribution line shunt monitoring device comprises an upper cover 1 and a lower cover 2, wherein the upper cover 1 consists of a left upper cover 11 and a right upper cover 12, the lower cover 2 consists of a left lower cover 21 and a right lower cover 22, the upper cover 1 is connected with the lower cover 2 through a rotating shaft 3, the upper cover 1 can be opened and closed along the rotating shaft 3, the left upper cover 11, the right upper cover 12, the left lower cover 21 and the right lower cover 22 are respectively provided with a semicircular potential slot 6, a power taking coil 7 is arranged in the potential slot 6 of the left upper cover 11 and the left lower cover 21, a current measuring coil 8 is arranged in the potential slot 6 of the right upper cover 12 and the right lower cover 22, the power taking coil 7 and the current measuring coil 8 are both provided with an elastic copper sheet 9 for voltage detection, the power taking coil 7 and the current measuring coil 8 are both of an open-close type, a high-permeability iron core is adopted, and when in assembly, an elastic sheet is assembled in a part of a shell without the coil, get electric coil 7 and current measurement coil 8 toward outer the top with opening and shutting, make two pairs of iron core tangent planes laminate well to make the iron core tangent plane not can not laminate well in order to avoid the assembly problem, make magnetic permeability reduce more, thereby the influence is got electric power and measurement accuracy, still be provided with main control circuit board 10 in the lower cover 2, main control circuit board 10 includes main control MCU14 and gets electric management circuit 15 and voltage detection circuit 16 with the electric connection of main control MCU14, main control MCU14 pass through the AD port with get electric coil 7 with current measurement coil 8 is connected, main control MCU14 is STM32L053MCU singlechip.
Specifically, a hook 4 is arranged right ahead the upper cover 1, a hasp 5 matched with the hook 4 is arranged on the lower cover 2, and the hasp 5 is matched with the hook 4 for use.
Specifically, get electric coil 7 and current measurement coil 8 interval setting, and get and still be equipped with infrared temperature sensor 13 between electric coil 7 and the current measurement coil 8, infrared temperature sensor 13 is connected with main control circuit board 10 electricity, and infrared temperature sensor 13 implements monitoring cable skin surface temperature to transmit the temperature value that detects for main control MCU14 and carry out the analysis, and infrared temperature sensor 13 in this embodiment is non-contact infrared temperature probe, and the measuring range of its temperature is-40 ℃ -300 ℃.
Specifically, the current measuring coil 8 is an open type current transformer made of a nanocrystalline material.
Specifically, the power-taking management circuit 15 includes a power-taking coil input terminal P1, a bridge rectifier composed of four diodes D1, D2, D3, and D4, a boost power management chip U1, and a comparator U3, the power-taking coil input terminal P1 is connected to the power-taking coil 7, one end of the power-taking coil input terminal P1 away from the power-taking coil 7 is connected to two ac input ends of the bridge rectifier, a dc output end of the bridge rectifier is connected to an N-channel MOS transistor Q2 and a resistor R2, the other end of the resistor R2 is connected to a pin No. 1 of the P-channel MOS transistor Q1, and charging and discharging of the super capacitor C1 are controlled; a No. 1 pin of the boosting power supply management chip U1 is connected with a No. 4 pin of an N-channel MOS tube Q2 after passing through a P-channel MOS tube Q3, a triode Q4 and a resistor R7, and controls the conduction and the closing of the N-channel MOS tube Q2; the No. 1 port of the comparator U3 is connected with the No. 1 pin of the P-channel MOS tube Q1 through a resistor R8 and a resistor R9, the No. 7 pin of the comparator U3 is connected with the P-channel MOS tube Q3, and the voltage threshold of the conduction of the P-channel MOS tube Q1 and the P-channel MOS tube Q3 is set through a comparator U3.
Specifically, the voltage detection circuit 16 includes a parasitic capacitor access end P2, one end of the parasitic capacitor access end P2 is connected with a parasitic capacitor existing between the cable and the elastic copper sheet 9, the other end of the parasitic capacitor access end P2 is connected with a CC and CRR filter circuit formed by a capacitor C13 and a resistor R23/R21, and then the other end of the parasitic capacitor access end P2 is input to the instrumentation amplifiers U7 and U6 through the operational amplifiers U11 and U5 for amplification, and is input to the AD port of the main control MCU14 through an RC low pass filter for AD conversion.
A monitoring method of a low-voltage distribution line shunt monitoring device specifically comprises the following steps:
the method comprises the following steps: opening the upper cover 1, putting the cable to be measured into an elastic copper sheet 9 for clamping the cable, closing the upper cover 1, and locking the hasp 5 with the hook 4 to enable the electricity taking coil 7 and the current measuring coil 8 to start working;
step two: the electricity taking coil 7 takes electricity, the electricity taking coil 7 rectifies and filters the taken alternating current through the electricity taking management circuit 15, and stabilizes the rectified voltage to 3.6V to supply power to the main control MCU14 and a post-stage circuit;
step three: the current measuring coil 8 measures current, the current measuring coil 8 transmits measuring data to the main control MCU14, and the main control MCU14 analyzes the data and displays the data on the host in a digital form;
step four: the infrared temperature sensor 13 is attached to the outer surface of the cable and detects the skin surface temperature of the cable in real time;
step five: the voltage detection circuit 16 detects the voltage value of the cable, a parasitic capacitor exists between the cable and the elastic copper sheet 9, a parasitic capacitor access end P2 of the voltage detection circuit 16 is connected with the parasitic capacitor, and the voltage value of the cable is further obtained through a parasitic capacitance value.
Specifically, the parasitic capacitance in the step five changes with the size of the cable, the size of the elastic copper sheet 9 and the influence of the environment, and the parasitic capacitance value is calculated by using an algorithm under different application conditions according to the characteristic requirements of the parasitic capacitance, and the parasitic capacitance value is calculated by using the following method:
the first algorithm is as follows: as shown in fig. 6, in topology 1, the cable voltage Vin is to be detected, the parasitic capacitance Cp is unknown, and the AD sample Va1 is known. The transfer function is as follows:
in topology 2, the cable voltage Vin is to be detected, the parasitic capacitance Cp is unknown, and the AD sample Va2 is known. The transfer function is as follows:
And (3) algorithm II: as shown in fig. 8, another topology circuit for voltage detection is shown, in which SW1 is an analog switch or relay, and by controlling SW1 to be turned on, the capacitor C is short-circuited, and the transfer function of the circuit is as shown in formula 1:
SW1 is disconnected, a capacitor C is connected in a loop in series, and the transfer function of the circuit is as the following formula 2:
Referring to fig. 9, fig. 9 is a circuit for implementing the second algorithm, which is as follows:
parasitic capacitance between the elastic copper sheet 9 and a cable is connected into a circuit from a terminal P2, Vcontrol is a control signal of a RELAY RELAY1, when the level is high, pins 3 and 5 of the RELAY are connected, a capacitor C6 is short-circuited, when the level is low, pins 3 and 5 of the RELAY are disconnected, a capacitor C6 is connected into the circuit, the signal is amplified by an operational amplifier C11 and then is led into an AD detection port of a single chip microcomputer through an RC filter composed of R29 and C20, a reference voltage VREF is divided by resistors R31 and R30, the reference voltage VREF is amplified in phase by the operational amplifier U11 and then is input into a pin 3 of the U11, so that the driving capability is increased, and an output pin 1 of an operational amplifier U11 is kept at a positive voltage.
The first algorithm and the second algorithm are only two algorithms, different calculation formulas can be obtained through a conversion topology circuit, and the deposited capacitance values obtained by technicians in the field through the method belong to the protection scope of the utility model.
Specifically, the method further comprises the following steps: the main control MCU14 calculates useful power, useless power and power factor according to the detected current value, voltage value and temperature value, judges whether the line has faults or not, and a storage module of the main control MCU14 stores data and uploads the data to a host computer matched with the low-voltage distribution line shunt monitoring device through an RS485 port or a wireless communication module.
In conclusion, the low-voltage distribution line branch detection monitoring device manufactured by the technical scheme has the advantages of being simple in structure, capable of achieving non-contact induction electricity taking and current, voltage and temperature detection, free of line access or external power supply from the distribution line, good in safety, fast in installation, safe to operate, low in cost and worthy of popularization and application.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a low pressure distribution lines monitoring devices along separate routes, includes upper cover (1) and lower cover (2), its characterized in that: the upper cover (1) is composed of a left upper cover (11) and a right upper cover (12), the lower cover (2) is composed of a left lower cover (21) and a right lower cover (22), the upper cover (1) is connected with the lower cover (2) through a rotating shaft (3), the upper cover (1) can be opened and closed along the rotating shaft (3), a semicircular position groove (6) is formed in the left upper cover (11), the right upper cover (12), the left lower cover (21) and the right lower cover (22), an electricity taking coil (7) is installed in the position groove (6) of the left upper cover (11) and the left lower cover (21), an electric current measuring coil (8) is installed in the position groove (6) of the right upper cover (12) and the right lower cover (22), an elastic copper sheet (9) for voltage detection is arranged on the electricity taking coil (7) and the electric current measuring coil (8), and a master control circuit board (10) is further arranged in the lower cover (2), the master control circuit board (10) includes master control MCU (14) and gets electric management circuit (15) and voltage detection circuit (16) with master control MCU (14) electricity is connected, master control MCU (14) through the AD port with it connects to get electric coil (7) and current measurement coil (8), master control MCU (14) is STM32L053MCU singlechip.
2. The low voltage distribution line shunt monitoring device of claim 1, wherein: a hook (4) is arranged right ahead the upper cover (1), and a hasp (5) matched with the hook (4) is arranged on the lower cover (2).
3. The low voltage distribution line shunt monitoring device of claim 1, wherein: get electric coil (7) and current measurement coil (8) interval setting, and get and still be equipped with infrared temperature sensor (13) between electric coil (7) and current measurement coil (8), infrared temperature sensor (13) are connected with main control circuit board (10) electricity.
4. The low voltage distribution line shunt monitoring device of claim 1, wherein: the current measuring coil (8) is an open type current transformer made of nanocrystalline materials.
5. The low voltage distribution line shunt monitoring device of claim 1, wherein: the power-taking management circuit (15) comprises a power-taking coil input terminal P1, a bridge rectifier consisting of four diodes D1, D2, D3 and D4, a boosting power management chip U1 and a comparator U3, wherein the power-taking coil input terminal P1 is connected with a power-taking coil (7), one end of the power-taking coil input terminal P1, which is far away from the power-taking coil (7), is connected with two alternating current input ends of the bridge rectifier, a direct current output end of the bridge rectifier is respectively connected with an N-channel MOS transistor Q2 and a resistor R2, the other end of the resistor R2 is connected with a No. 1 pin of the P-channel MOS transistor Q1, and charging and discharging of a super capacitor C1 are controlled; a No. 1 pin of the boosting power supply management chip U1 is connected with a No. 4 pin of an N-channel MOS tube Q2 after passing through a P-channel MOS tube Q3, a triode Q4 and a resistor R7, and controls the conduction and the closing of the N-channel MOS tube Q2; the No. 1 port of the comparator U3 is connected with the No. 1 pin of the P-channel MOS tube Q1 through a resistor R8 and a resistor R9, the No. 7 pin of the comparator U3 is connected with the P-channel MOS tube Q3, and the voltage threshold of the conduction of the P-channel MOS tube Q1 and the P-channel MOS tube Q3 is set through a comparator U3.
6. The low voltage distribution line shunt monitoring device of claim 1, wherein: the voltage detection circuit (16) comprises a parasitic capacitor access end P2, one end of the parasitic capacitor access end P2 is connected with a parasitic capacitor existing between the cable and the elastic copper sheet (9), the other end of the parasitic capacitor access end P2 is connected with a CC and CRR filter circuit formed by a capacitor C13 and a resistor R23/R21 respectively, and then the other end of the parasitic capacitor access end P2 is input to an instrumentation amplifier U7 and a U6 through an operational amplifier U11 and a U5 respectively for amplification, and is input to an AD port of the main control MCU (14) through an RC low pass filter for AD conversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921018263.XU CN209945426U (en) | 2019-07-02 | 2019-07-02 | Low-voltage distribution line shunt monitoring device |
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| CN201921018263.XU CN209945426U (en) | 2019-07-02 | 2019-07-02 | Low-voltage distribution line shunt monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274630A (en) * | 2019-07-02 | 2019-09-24 | 凯铭诺(深圳)科技有限公司 | A kind of low-voltage distributing line branch monitoring device and its monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274630A (en) * | 2019-07-02 | 2019-09-24 | 凯铭诺(深圳)科技有限公司 | A kind of low-voltage distributing line branch monitoring device and its monitoring method |
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