CN112130093A - Wire aligning detection device for realizing wire-disconnecting-free test by utilizing linear Hall sensor - Google Patents
Wire aligning detection device for realizing wire-disconnecting-free test by utilizing linear Hall sensor Download PDFInfo
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Abstract
The embodiment of the application provides a pair line detection device for realizing a disconnection-free test by using a linear Hall sensor, which is used for detecting the installation direction of a line to be detected and comprises an excitation source for inputting standard current to the pair line to be detected and a detection module for detecting the current direction of the standard current in the line to be detected and outputting a detection result; the detection module comprises a signal detection circuit, the signal detection circuit comprises a jaw iron core used for sensing a magnetic field generated by current in a line to be detected, a linear Hall sensor used for converting the sensed magnetic field into an electric signal, and the alignment detection device further comprises a power supply management module used for supplying power to the excitation source and the detection module. The pair line detection device realizes the pair line of the small resistance circuits such as the secondary circuit of the mutual inductor without detaching the line, solves the problem of difficult wire detaching in a narrow space, and can play the roles of shortening the pair line time, reducing accidents and improving the wiring correctness of the metering device.
Description
Technical Field
The invention belongs to the field of electric power overhaul, and particularly relates to a wire alignment detection device for realizing a wire disconnection-free test by using a linear Hall sensor.
Background
The secondary circuit of the power system plays important roles in measurement, monitoring, protection and control, and the importance of the wiring accuracy of the secondary circuit is self-evident. There are a lot of secondary circuit construction work in the whole power system from the consumer electrical engineering, low-voltage transformer area to the power plant, and in various high-low voltage switch cabinets and electrical equipment.
The metering mutual inductor secondary wiring correctness is the premise of ensuring the metering accuracy, in order to ensure the wiring correctness of the metering device, for the installation work of the metering device containing a newly installed and replaced mutual inductor, a meter installation and power connection worker needs to check whether the wiring from a secondary terminal of the mutual inductor to a junction box is correct or not, when checking the wiring, the wire at the end of the mutual inductor needs to be detached, and after the wire alignment is completed, the wire is connected with the terminal.
At present when the operation is checked at the wire, the operation personnel often need get into and carry out the operation in narrow and small space, often have inconvenient work of taking a connection, taking out stitches of mutual-inductor secondary terminal position, and work is wasted time and energy.
Usually, a universal meter is selected as a lead checking tool, and lead checking work comprises main links of instrument preparation, proper working position selection, wiring removal, lead checking, wiring recovery, arrangement and the like. The panelists timed the lead verification work for a company with 10 installations of high voltage metering devices.
By visiting the attaching personnel and testing on site, the panelists find that the wire verification work mainly has the following problems: the wire connecting and disconnecting time in a small space accounts for the vast majority of the wire connecting and disconnecting work; the work in a narrow space is easy to have the collision and rubbing accidents; the wiring after the wiring can only be checked by visual inspection and cannot be checked by an instrument.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a wire alignment detection device for realizing a wire disconnection-free test by using a linear Hall sensor, which is used for detecting the installation direction of a line to be detected, and comprises:
the detection device comprises an excitation source for inputting standard current to a to-be-detected paired line, and a detection module for detecting the current direction of the standard current in the to-be-detected line and outputting a detection result;
the detection module comprises a signal detection circuit, the signal detection circuit comprises a jaw iron core used for sensing a magnetic field generated by current in a line to be detected and a linear Hall sensor used for converting the sensed magnetic field into an electric signal, and the alignment detection device further comprises a power supply management module used for supplying power to an excitation source and the detection module.
Optionally, the excitation source includes:
the voltage reduction chip U2 is characterized in that the 9V output end of the VIN pin power management module of the voltage reduction chip U2 is electrically connected, and the GND pin of the voltage reduction chip U2 is grounded through a resistor R8;
the SW pin of the buck chip is electrically connected with a positive output end N-CON1 serving as an excitation source through an inductor L1 and a resistor RQ in sequence, diodes D10 and D11 which are connected in parallel are arranged between the inductor L1 and the resistor RQ, one end, far away from the buck chip U2, of an inductor L1 is also electrically connected with a negative output end N-CON1 serving as an excitation source through capacitors C4 and C5 which are connected in parallel, and one end, close to the buck chip U2, of the inductor L1 is grounded through a diode D1;
the EN pin of the voltage reduction chip is also electrically connected with the detection module through a resistor R5, the COMP pin of the voltage reduction chip U2 is also grounded through a capacitor C6 and a resistor R10, meanwhile, the FB pin of the voltage reduction chip U2 is grounded through a resistor R11 on one hand, and is electrically connected with an EN-LF-Z enabling end through a resistor R9 on the other hand, the FREQ pin of the voltage reduction chip U2 is grounded through a resistor R8, and the BST pin of the voltage reduction chip U2 is electrically connected with the SW pin of the voltage reduction chip through a capacitor C3.
Optionally, the detection module includes:
from the signal detection circuit including keeping silent iron core and linear hall sensor, signal detection circuit transmits the voltage signal that linear hall sensor conversion obtained to signal amplification circuit and carries out the amplification filtering process to signal sampling processing circuit carries out the analysis with the signal transmission after handling, shows the result after will analyzing with the LED circuit.
Optionally, the signal detection circuit includes:
the detection circuit comprises a jaw iron core, linear Hall sensors U7 and U9, an integrated chip U5 and an integrated chip U8, wherein the jaw iron core is used for generating an induction magnetic field due to standard current change in a circuit to be detected, the linear Hall sensors U7 and U9 are used for generating voltage signals based on the induction magnetic field, and the integrated chip U5 corresponds to the linear Hall sensor U7 and the integrated chip U8 corresponds to the linear Hall sensor U9;
in the signal detection circuit, comprising:
one end of a magnetic ring inductor L3 and one end of a magnetic ring inductor L3 are connected with a +5V power supply end, and the other end of a magnetic ring inductor L3 is grounded through a capacitor C18 on one hand and a three-terminal voltage stabilizer through resistors R33 and CJ431 on the other hand.
Optionally, the signal detection circuit includes:
a resistor R16 is arranged between a-RG pin and a + RG pin of the integrated chip U5, a-IN pin of the integrated chip U5 is electrically connected with a REF pin of the integrated chip U5 through a resistor R17 and a resistor R20, a + IN pin of the integrated chip U5 is electrically connected with the linear Hall sensor U7 through a resistor R18, a + VS pin of the integrated chip U5 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U5 is electrically connected with a signal processing circuit through a resistor R19;
a resistor R26 is arranged between a-RG pin and a + RG pin of an integrated chip U8, a-IN pin of the integrated chip U8 is electrically connected with a REF pin of the integrated chip U8 through a resistor R27 and a resistor 30, a + IN pin of the integrated chip U8 is electrically connected with a linear Hall sensor U9 through a resistor R28, a + VS pin of the integrated chip U8 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U8 is electrically connected with a signal processing circuit through a resistor R29.
Optionally, the signal amplifying circuit includes:
a first signal amplification circuit corresponding to integrated chip U5, and a second amplification circuit corresponding to integrated chip U8.
Optionally, the first signal amplifying circuit includes:
the bidirectional operational amplifier U1A is characterized in that a forward control end of a bidirectional operational amplifier U1A is connected with a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected with a REF pin of an integrated chip U5 through a resistor R1 on the one hand, and is grounded through a resistor R2 and a capacitor C2 in sequence and is connected with a signal processing circuit through a resistor R3 on the other hand, and a forward input end of the bidirectional operational amplifier U1A is electrically connected with a linear Hall sensor U7 through a resistor R4.
Optionally, the second signal amplifying circuit includes:
the bidirectional operational amplifier U1B is characterized in that a forward control end of a bidirectional operational amplifier U1B is connected with a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected with a REF pin of an integrated chip U8 through a resistor R6 on the one hand, and is grounded through a resistor R7 and a capacitor C7 in sequence and is connected with a signal processing circuit through a resistor R12 on the other hand, and a forward input end of the bidirectional operational amplifier U1B is electrically connected with a linear Hall sensor U9 through a resistor R13.
Optionally, the signal processing circuit includes:
AN EN-SW pin of a processing chip U6 of the processing chip U6 is electrically connected with AN excitation source, AN AN0/CMPP/P10 pin and AN AN1/CMPN/P11 pin of the processing chip U6 are respectively electrically connected with a signal detection circuit, and AN RST pin of the processing chip U6 is electrically connected with a +5V power supply end through a resistor R21 on one hand and is grounded through a capacitor C14 on the other hand;
the P33 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R31 and a diode D3, the P34 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R32 and a diode D4, the P35 pin of the processing chip U6 is connected with the base of a triode Q1 through a resistor R24, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with the negative electrode of a buzzer, and the positive electrode of the buzzer is connected with the +5V power supply end through a resistor R22.
Optionally, the power management module includes:
a VIN pin of the voltage reduction chip U3 is electrically connected with a power switch through a resistor R14, capacitors C8 and C9 which are connected in parallel are further arranged between the resistor R14 and the voltage reduction chip U3, and one ends of the capacitors C8 and C9, which are far away from the voltage reduction chip, are grounded; the OUTPUT pin of the buck chip U3 OUTPUTs +5V voltage through an inductor L2 on one hand, and is grounded through a diode D2 on the other hand, and a capacitor C10 and a capacitor C11 which are connected in parallel are further arranged at the +5V OUTPUT end;
the FEEDBACK pin of the voltage reduction chip U3 is electrically connected with the +5V output end, the ON/OFF pin of the voltage reduction chip U3 is electrically connected with the power switch ON one hand, and is grounded through the resistor R15 ON the other hand, and the GND pin of the voltage reduction chip U3 is grounded.
The technical scheme provided by the invention has the beneficial effects that:
the pair line detection device realizes the pair line of the small resistance circuits such as the secondary circuit of the mutual inductor without detaching the line, solves the problem of difficult wire detaching in a narrow space, and can play the roles of shortening the pair line time, reducing accidents and improving the wiring correctness of the metering device.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an alignment detection apparatus for implementing a disconnection-free test by using a linear hall sensor according to the present application.
Detailed Description
To make the structure and advantages of the present invention clearer, the structure of the present invention will be further described with reference to the accompanying drawings.
Example one
The invention provides a pair line detection device for realizing a disconnection-free test by using a linear Hall sensor, which is used for detecting the installation direction of a line to be detected, and as shown in figure 1, the pair line detection device comprises:
the detection device comprises an excitation source for inputting standard current to a to-be-detected paired line, and a detection module for detecting the current direction of the standard current in the to-be-detected line and outputting a detection result;
the detection module comprises a signal detection circuit, the signal detection circuit comprises a jaw iron core used for sensing a magnetic field generated by current in a line to be detected and a linear Hall sensor used for converting the sensed magnetic field into an electric signal, and the alignment detection device further comprises a power supply management module used for supplying power to an excitation source and the detection module.
In the implementation, in the small-resistance loop alignment work, an excitation signal is injected at one end (convenient operation or open end) of the loop by using the instrument, and a lead passes through the detection element at the other end (inconvenient operation end) of the loop, so that the wire alignment without wire disassembly is realized. The detection element uses a pincerlike sensor, so that the operation is convenient, and simultaneously, the polarity can be detected.
The product is mainly used for checking the wiring of an electrical secondary small resistance loop in a power failure state, and is mainly applied to checking the secondary wires of the mutual inductor and checking whether the two wires belong to an equipotential point.
Many of the research methods in the literature propose removing both ends of the wire, adding a signal to one end, and detecting the other end. The method of adding a signal at one end provides a reference. The linear Hall sensor plays a good role in magnetoelectric conversion in the detection of a weak magnetic field. A pulse signal is added into a primary loop, and an induction signal can be measured at a secondary side by utilizing the principle of a mutual inductor. By taking the principle as a reference, a signal is added at the far end of the secondary side transformer, the signal is detected at the near transformer end, and meanwhile, although the polarity requirement does not exist for two wires led out from the equipotential point, the wire alignment function can also be realized.
The wiring correctness is the basis of circuit operation, and in order to ensure the wiring correctness, a common method is to perform wiring check (hereinafter referred to as wire alignment) before electrifying, and the current wire alignment products and methods are both directed at the wire itself. When 2 and above wires need to be aligned, the wires can not form a loop, namely, the two ends of the wires need to be detached from the original circuit, the secondary electric wiring is often installed in a narrow space, the operation of the wire detaching work is inconvenient, the wiring needs to be recovered after the wiring is completed, and the wiring is not checked again at the moment.
The product mainly comprises a power supply management unit, an excitation source unit and a magnetic field detection and detection unit. The power supply management mainly provides a working power supply for the instrument; the excitation source is a cross current source, and a standard excitation current is injected into the loop; the magnetic field detection element detects the magnetic field direction of the excitation current so as to judge the current direction; the detection unit is used for filtering, amplifying and judging the detection signal; the output unit is used for outputting the detection result. The power management module can provide power for the excitation loop, the detection loop and the output loop in real time; the excitation module is used for inputting a standard current to the circuit; the signal detection circuit is used for detecting the current direction of the circuit under the condition of standard current input; the signal processing module is used for filtering, amplifying and the like on the detection signal; and the result output module is used for outputting the detection result.
By realizing the disconnection-free wire alignment of small resistance loops such as a secondary loop of the mutual inductor, the problem of difficult wire connection and disconnection in a narrow space is solved, the wire alignment efficiency is improved, and the problem that the wire cannot be aligned after the recovery of the conventional wire alignment work is avoided. The wire aligning device has the advantages that the wire aligning time can be shortened, accidents are reduced, and the wiring correctness of the metering device is improved, so that the mounting efficiency and the mounting quality of the metering device are improved.
Optionally, the excitation source includes:
the voltage reduction chip U2 is characterized in that the 9V output end of the VIN pin power management module of the voltage reduction chip U2 is electrically connected, and the GND pin of the voltage reduction chip U2 is grounded through a resistor R8;
the SW pin of the buck chip U2 is electrically connected with a positive output end N-CON1 serving as an excitation source through an inductor L1 and a resistor RQ in sequence, diodes D10 and D11 which are connected in parallel are arranged between the inductor L1 and the resistor RQ, one end of the inductor L1, far away from the buck chip U2, is also electrically connected with a negative output end N-CON1 serving as an excitation source through capacitors C4 and C5 which are connected in parallel, and one end of the inductor L1, close to the buck chip U2, is also grounded through a diode D1;
the EN pin of the voltage reduction chip is also electrically connected with the detection module through a resistor R5, the COMP pin of the voltage reduction chip U2 is also grounded through a capacitor C6 and a resistor R10, meanwhile, the FB pin of the voltage reduction chip U2 is grounded through a resistor R11 on one hand, and is electrically connected with an EN-LF-Z enabling end through a resistor R9 on the other hand, the FREQ pin of the voltage reduction chip U2 is grounded through a resistor R8, and the BST pin of the voltage reduction chip U2 is electrically connected with the SW pin of the voltage reduction chip through a capacitor C3.
In implementation, the voltage reduction chip U2 is specifically an MP1584 power supply chip, and is based on a voltage reduction type typical application circuit design of an MP1584 power supply module, and a schematic diagram/PCB source file, AD and p are attached. MP1584 is packaged by 8 pins of a patch, the working voltage is 4.5-28V, the working frequency is 1.5MHz, and the output current is 3A. The switching signal PWM is added on the MOS tube Q to control the on and off of the switching tube, so that the inductor and the capacitor are charged and discharged to achieve the purpose of reducing the voltage of the power supply. The MP1584 chip is internally provided with short-circuit protection, the short-circuit current threshold is 4.87A, and the short-circuit current can be recovered instantly after overload is removed. The exciting module is used for inputting a standard current to the circuit, and when the current passes through the lead to be detected, a certain magnetic field is generated around the lead so as to be detected by the detecting module. The excitation current is required to be sufficiently large and the time sufficiently short. The model of the voltage reduction chip U2 is MP 1584.
Optionally, the detection module includes:
from the signal detection circuit including keeping silent iron core and linear hall sensor, signal detection circuit transmits the voltage signal that linear hall sensor conversion obtained to signal amplification circuit and carries out the amplification filtering process to signal sampling processing circuit carries out the analysis with the signal transmission after handling, shows the result after will analyzing with the LED circuit.
In an implementation, the signal detection circuit is used to detect the current direction of the circuit at a standard current input.
The signal detection circuit comprises a jaw iron core used for generating an induction magnetic field due to standard current change in a circuit to be detected, linear Hall sensors U7 and U9 based on the induction magnetic field to generate voltage signals, an integrated chip U5 corresponding to the linear Hall sensor U7 and an integrated chip U8 corresponding to the linear Hall sensor U9; the jaw iron core is a permalloy jaw, and the magnetoelectric conversion element is YS 149. The function of the jaw core is to collect the magnetic field generated by the current flowing through the core line.
The signal detection circuit comprises a magnetic loop inductor L3, one end of a magnetic loop inductor L3 is connected with a +5V power supply end, and the other end of a magnetic loop inductor L3 is grounded through a capacitor C18 on one hand and a three-terminal voltage stabilizer of resistors R33 and CJ431 on the other hand.
Optionally, the signal detection circuit includes:
a resistor R16 is arranged between a-RG pin and a + RG pin of the integrated chip U5, a-IN pin of the integrated chip U5 is electrically connected with a REF pin of the integrated chip U5 through a resistor R17 and a resistor R20, a + IN pin of the integrated chip U5 is electrically connected with the linear Hall sensor U7 through a resistor R18, a + VS pin of the integrated chip U5 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U5 is electrically connected with a signal processing circuit through a resistor R19;
a resistor R26 is arranged between a-RG pin and a + RG pin of an integrated chip U8, a-IN pin of the integrated chip U8 is electrically connected with a REF pin of the integrated chip U8 through a resistor R27 and a resistor 30, a + IN pin of the integrated chip U8 is electrically connected with a linear Hall sensor U9 through a resistor R28, a + VS pin of the integrated chip U8 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U8 is electrically connected with a signal processing circuit through a resistor R29.
In implementation, the signal processing module is used for performing processing such as filtering and amplification on the detection signal;
the signal amplifying circuit comprises a first signal amplifying circuit corresponding to the integrated chip U5 and a second signal amplifying circuit corresponding to the integrated chip U8, and the signal amplifying circuit is AD 623. The signal amplifying circuit is responsible for outputting millivolt level of the Hall sensor, and the output signal is sent to the CPU for data processing after being amplified.
Optionally, the first signal amplifying circuit includes a bidirectional operational amplifier U1A, a forward control end of the bidirectional operational amplifier U1A is connected to a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected to a REF pin of an integrated chip U5 through a resistor R1 on the one hand, and is grounded through a resistor R2 and a capacitor C2 in sequence on the other hand, and is connected to the signal processing circuit through a resistor R3 on the other hand, and a forward input end of the bidirectional operational amplifier U1A is electrically connected to the linear hall sensor U7 through a resistor R4.
The second signal amplifying circuit comprises a bidirectional operational amplifier U1B, wherein a forward control end of a bidirectional operational amplifier U1B is connected with a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected with a REF pin of an integrated chip U8 through a resistor R6 on the one hand, and is grounded through a resistor R7 and a capacitor C7 in sequence on the other hand, and is connected with a signal processing circuit through a resistor R12 at the same time, and a forward input end of the bidirectional operational amplifier U1B is electrically connected with a linear Hall sensor U9 through a resistor R13.
The specific model of the bidirectional operational amplifiers U1A and U1B is LM358DR 2G.
Optionally, the signal processing circuit includes:
AN EN-SW pin of a processing chip U6 of the processing chip U6 is electrically connected with AN excitation source, AN AN0/CMPP/P10 pin and AN AN1/CMPN/P11 pin of the processing chip U6 are respectively electrically connected with a signal detection circuit, and AN RST pin of the processing chip U6 is electrically connected with a +5V power supply end through a resistor R21 on one hand and is grounded through a capacitor C14 on the other hand; the P33 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R31 and a diode D3, the P34 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R32 and a diode D4, the P35 pin of the processing chip U6 is connected with the base of a triode Q1 through a resistor R24, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with the negative electrode of a buzzer, and the positive electrode of the buzzer is connected with the +5V power supply end through a resistor R22.
In implementation, the processing chip U6 has a model G80F903A-SOP 20. The signal processing circuit is responsible for logic control of the whole instrument besides judging the result of the signal. At present, the types of single-chip microcomputers are various, namely from 51 single-chip microcomputers to ARM, and ARM is from M0 cores to M4 cores. The 51 single chip microcomputer is low in power consumption, low in price, single-cycle instruction, the highest main frequency can reach 24M, the single chip microcomputer is the single chip microcomputer with the lowest performance, the requirement on the running speed of the single chip microcomputer is not high through early-stage data processing and judgment, and the 51 single chip microcomputer completely meets the use requirement. The circuit has low requirements on peripheral interfaces of the single chip microcomputer and the precision of a master frequency clock, so that a 51 single chip microcomputer is selected.
Optionally, the power management module includes:
a VIN pin of the voltage reduction chip U3 is electrically connected with a power switch through a resistor R14, capacitors C8 and C9 which are connected in parallel are further arranged between the resistor R14 and the voltage reduction chip U3, and one ends of the capacitors C8 and C9, which are far away from the voltage reduction chip, are grounded; the OUTPUT pin of the buck chip U3 OUTPUTs +5V voltage through an inductor L2 on one hand, and is grounded through a diode D2 on the other hand, and a capacitor C10 and a capacitor C11 which are connected in parallel are further arranged at the +5V OUTPUT end;
the FEEDBACK pin of the voltage reduction chip U3 is electrically connected with the +5V output end, the ON/OFF pin of the voltage reduction chip U3 is electrically connected with the power switch ON one hand, and is grounded through the resistor R15 ON the other hand, and the GND pin of the voltage reduction chip U3 is grounded.
In practice, the battery supplies power to the meter, needs to satisfy circuit requirements and is already mounted in the hand-held device. Common batteries include 9V alkaline batteries and 7 # batteries. The power management module control chip is responsible for distributing power to the excitation module and other modules, and needs to meet the requirement of short-time heavy current output of the excitation module and provide stable voltage for other circuits. The buck chip U3 is XL 1509.
Starting from 9 and 10 months in 2019, 5 high-voltage user metering devices in a certain city are provided with wires and the work is timed, and the time statistical result is as follows:
table 1 statistics of secondary to non-dismantling wire alignment on-site test time of mutual inductor
| Serial number | Preparation of | Position selection | Wire alignment | Finishing | Total up to |
| 1 | 25 | 10 | 65 | 25 | 125 |
| 2 | 28 | 15 | 70 | 25 | 138 |
| 3 | 32 | 20 | 75 | 29 | 156 |
| 4 | 25 | 18 | 68 | 28 | 139 |
| 5 | 22 | 18 | 72 | 28 | 140 |
| Mean value of | 26.4 | 16.2 | 70 | 27 | 139.6 |
As can be seen from the table, after the instrument is used, the checking time of the secondary lead of the mutual inductor is averagely reduced to 2.3 minutes, and the expected effect of activity is achieved.
After the self-developed wire alignment instrument is used, the installation personnel of the metering device realize the wire alignment without wire disassembly, the installation time of the metering device is shortened, and the installation quality is improved; the operation in a narrow space is not needed, and the accidents of the rubbing injury are reduced.
The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an utilize linear hall sensor to realize exempting from to tear open line measuring to line detection device for to detect the installation direction of waiting to detect the circuit, its characterized in that, to line detection device includes:
the detection device comprises an excitation source for inputting standard current to a to-be-detected paired line, and a detection module for detecting the current direction of the standard current in the to-be-detected line and outputting a detection result;
the detection module comprises a signal detection circuit, the signal detection circuit comprises a jaw iron core used for sensing a magnetic field generated by current in a line to be detected and a linear Hall sensor used for converting the sensed magnetic field into an electric signal, and the alignment detection device further comprises a power supply management module used for supplying power to an excitation source and the detection module.
2. The alignment detection device for realizing the disconnection-free test by using the linear hall sensor as claimed in claim 1, wherein the excitation source comprises:
the voltage reduction chip U2 is characterized in that the 9V output end of the VIN pin power management module of the voltage reduction chip U2 is electrically connected, and the GND pin of the voltage reduction chip U2 is grounded through a resistor R8;
the SW pin of the buck chip is electrically connected with a positive output end N-CON1 serving as an excitation source through an inductor L1 and a resistor RQ in sequence, diodes D10 and D11 which are connected in parallel are arranged between the inductor L1 and the resistor RQ, one end, far away from the buck chip U2, of an inductor L1 is also electrically connected with a negative output end N-CON1 serving as an excitation source through capacitors C4 and C5 which are connected in parallel, and one end, close to the buck chip U2, of the inductor L1 is grounded through a diode D1;
the EN pin of the voltage reduction chip is also electrically connected with the detection module through a resistor R5, the COMP pin of the voltage reduction chip U2 is also grounded through a capacitor C6 and a resistor R10, meanwhile, the FB pin of the voltage reduction chip U2 is grounded through a resistor R11 on one hand, and is electrically connected with an EN-LF-Z enabling end through a resistor R9 on the other hand, the FREQ pin of the voltage reduction chip U2 is grounded through a resistor R8, and the BST pin of the voltage reduction chip U2 is electrically connected with the SW pin of the voltage reduction chip through a capacitor C3.
3. The alignment detection device for realizing the disconnection-free test by using the linear hall sensor according to claim 1, wherein the detection module comprises:
from the signal detection circuit including keeping silent iron core and linear hall sensor, signal detection circuit transmits the voltage signal that linear hall sensor conversion obtained to signal amplification circuit and carries out the amplification filtering process to signal sampling processing circuit carries out the analysis with the signal transmission after handling, shows the result after will analyzing with the LED circuit.
4. The alignment detection device for realizing the disconnection-free test by using the linear hall sensor according to claim 3, wherein the signal detection circuit comprises:
the detection circuit comprises a jaw iron core, linear Hall sensors U7 and U9, an integrated chip U5 and an integrated chip U8, wherein the jaw iron core is used for generating an induction magnetic field due to standard current change in a circuit to be detected, the linear Hall sensors U7 and U9 are used for generating voltage signals based on the induction magnetic field, and the integrated chip U5 corresponds to the linear Hall sensor U7 and the integrated chip U8 corresponds to the linear Hall sensor U9;
in the signal detection circuit, comprising:
one end of a magnetic ring inductor L3 and one end of a magnetic ring inductor L3 are connected with a +5V power supply end, and the other end of a magnetic ring inductor L3 is grounded through a capacitor C18 on one hand and a three-terminal voltage stabilizer through resistors R33 and CJ431 on the other hand.
5. The alignment detection device for realizing the disconnection-free test by using the linear hall sensor according to claim 4, wherein the signal detection circuit comprises:
a resistor R16 is arranged between a-RG pin and a + RG pin of the integrated chip U5, a-IN pin of the integrated chip U5 is electrically connected with a REF pin of the integrated chip U5 through a resistor R17 and a resistor R20, a + IN pin of the integrated chip U5 is electrically connected with the linear Hall sensor U7 through a resistor R18, a + VS pin of the integrated chip U5 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U5 is electrically connected with a signal processing circuit through a resistor R19;
a resistor R26 is arranged between a-RG pin and a + RG pin of an integrated chip U8, a-IN pin of the integrated chip U8 is electrically connected with a REF pin of the integrated chip U8 through a resistor R27 and a resistor 30, a + IN pin of the integrated chip U8 is electrically connected with a linear Hall sensor U9 through a resistor R28, a + VS pin of the integrated chip U8 is grounded through C12 and C13 respectively, and a pin OUTPUT of the integrated chip U8 is electrically connected with a signal processing circuit through a resistor R29.
6. The device for detecting the alignment of the wire disconnection-free test by using the linear hall sensor as claimed in claim 5, wherein the signal amplifying circuit comprises:
a first signal amplification circuit corresponding to integrated chip U5, and a second amplification circuit corresponding to integrated chip U8.
7. The device for detecting the alignment of the wire disconnection-free test by using the linear hall sensor as claimed in claim 6, wherein the first signal amplifying circuit comprises:
the bidirectional operational amplifier U1A is characterized in that a forward control end of a bidirectional operational amplifier U1A is connected with a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected with a REF pin of an integrated chip U5 through a resistor R1 on the one hand, and is grounded through a resistor R2 and a capacitor C2 in sequence and is connected with a signal processing circuit through a resistor R3 on the other hand, and a forward input end of the bidirectional operational amplifier U1A is electrically connected with a linear Hall sensor U7 through a resistor R4.
8. The device for detecting the alignment of the wire test using the linear hall sensor according to claim 6, wherein the second signal amplifying circuit comprises:
the bidirectional operational amplifier U1B is characterized in that a forward control end of a bidirectional operational amplifier U1B is connected with a +5V power supply end on one hand, and is grounded through a capacitor C1 on the other hand, a reverse control end of the bidirectional operational amplifier U1A is grounded, a reverse input end of the bidirectional operational amplifier U1A is connected with a REF pin of an integrated chip U8 through a resistor R6 on the one hand, and is grounded through a resistor R7 and a capacitor C7 in sequence and is connected with a signal processing circuit through a resistor R12 on the other hand, and a forward input end of the bidirectional operational amplifier U1B is electrically connected with a linear Hall sensor U9 through a resistor R13.
9. The alignment detection device for realizing the disconnection-free test by using the linear hall sensor according to claim 3, wherein the signal processing circuit comprises:
AN EN-SW pin of a processing chip U6 of the processing chip U6 is electrically connected with AN excitation source, AN AN0/CMPP/P10 pin and AN AN1/CMPN/P11 pin of the processing chip U6 are respectively electrically connected with a signal detection circuit, and AN RST pin of the processing chip U6 is electrically connected with a +5V power supply end through a resistor R21 on one hand and is grounded through a capacitor C14 on the other hand;
the P33 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R31 and a diode D3, the P34 pin of the processing chip U6 is sequentially connected with a +5V power supply end through a resistor R32 and a diode D4, the P35 pin of the processing chip U6 is connected with the base of a triode Q1 through a resistor R24, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with the negative electrode of a buzzer, and the positive electrode of the buzzer is connected with the +5V power supply end through a resistor R22.
10. The device for detecting the alignment of the test wire by using the linear hall sensor as claimed in claim 1, wherein the power management module comprises:
a VIN pin of the voltage reduction chip U3 is electrically connected with a power switch through a resistor R14, capacitors C8 and C9 which are connected in parallel are further arranged between the resistor R14 and the voltage reduction chip U3, and one ends of the capacitors C8 and C9, which are far away from the voltage reduction chip, are grounded; the OUTPUT pin of the buck chip U3 OUTPUTs +5V voltage through an inductor L2 on one hand, and is grounded through a diode D2 on the other hand, and a capacitor C10 and a capacitor C11 which are connected in parallel are further arranged at the +5V OUTPUT end;
the FEEDBACK pin of the voltage reduction chip U3 is electrically connected with the +5V output end, the ON/OFF pin of the voltage reduction chip U3 is electrically connected with the power switch ON one hand, and is grounded through the resistor R15 ON the other hand, and the GND pin of the voltage reduction chip U3 is grounded.
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| CN112130093B (en) | 2023-11-28 |
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