CN117388761B - Multi-core secondary cable core wire device and method based on variable frequency resonance - Google Patents
Multi-core secondary cable core wire device and method based on variable frequency resonance Download PDFInfo
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- CN117388761B CN117388761B CN202311687127.0A CN202311687127A CN117388761B CN 117388761 B CN117388761 B CN 117388761B CN 202311687127 A CN202311687127 A CN 202311687127A CN 117388761 B CN117388761 B CN 117388761B
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- 239000002184 metal Substances 0.000 claims abstract description 100
- 238000005070 sampling Methods 0.000 claims description 41
- 239000003990 capacitor Substances 0.000 claims description 32
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- 238000003780 insertion Methods 0.000 claims 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
- G01R31/60—Identification of wires in a multicore cable
Abstract
The invention belongs to the technical field of power engineering field construction, and particularly provides a multi-core secondary cable nuclear line device and method based on variable frequency resonance, wherein the device comprises an LC resonance contact pin and a host, and the LC resonance contact pin and the host are respectively connected to two ends of a secondary cable to be nuclear line to form an LC series resonance circuit; the device is simple and convenient to operate, and only needs a single person to perform nuclear line operation. After the metal contact pin is inserted into the existing terminal strip, the host computer is opened to quickly and accurately check the wire, so that the device is convenient and quick, manpower and material resources are saved, the LC resonance contact pin does not need to be connected with a power supply, can be carried in a pocket, and is convenient to insert and use.
Description
Technical Field
The invention belongs to the technical field of field construction of power engineering, and particularly relates to a multi-core secondary cable core wire device and method based on variable frequency resonance.
Background
Laying secondary cables is a common work in substation site construction, where the checking of the secondary cable cores is the most important part of them. The related functions can be realized only by correctly accessing the wire cores at the two ends of the cable into the corresponding positions of the equipment. Once the core is checked inaccurately, serious accidents such as unexpected power failure of the transformer substation can be caused. The number of cores of the secondary cable commonly used at present is generally tens of cores, and the difficulty of the checking process is high.
At present, two common secondary cable core wire methods exist in the construction process: firstly, two people use the universal meter to match the nuclear line, and secondly, a professional nuclear line instrument is adopted to carry out nuclear line.
When two people use the universal meter to match the nuclear line, two people are needed to be respectively positioned at the near end and the far end of the cable, the far end is firstly grounded with one core, the near end hand is used for the universal meter, the universal meter is used for measuring the on-off gear to sequentially measure the on-off condition of each core to the ground, and when a certain core to the ground loop is measured to be connected, the core corresponding to the far end is found. This method is the most commonly used method in actual working sites, but has a plurality of disadvantages and inconveniences at the same time. Firstly, two persons have to cooperate to perform the operation, and the two persons have to use the communication equipment to perform remote communication, which seriously wastes manpower. Secondly, the accuracy of the nuclear wire is greatly affected by the universal meter, the universal meter is not a tool specially used for carrying out nuclear wire, and the accuracy of the nuclear wire cannot be guaranteed. And the joint of the watch pen and the watch body is easy to loosen, the watch needle is easy to bend and the watch line is easy to break, and the accuracy of the nuclear line is greatly influenced in intangible. Third, if there is no good grounding point at one end of the cable, the core wire will not be completed accurately. Fourth, if the number of cores of the cable is large, the method is extremely low in efficiency and extremely time-consuming.
When the existing core line equipment is used for core line, a plurality of problems exist. Firstly, the equipment performs nuclear line by utilizing the principle that one end transmits level or the other end receives pulse, if the method is to be successfully realized, the two ends of the method are connected with precise instruments and equipment, and the equipment cost is extremely high. Second, such devices typically require a power supply on the two-terminal instrument, are poorly portable, are difficult to transfer in field operations, and are not suitable for continuous multi-site operations. Thirdly, the operation of the device is complicated, the use is inconvenient, and more manpower and material resources are wasted in the working process. Fourth, professional nuclear line equipment is generally more precise, is fragile in a relatively harsh construction environment, and is difficult for non-professionals to maintain.
Disclosure of Invention
Aiming at the defects that two persons are required to match a nuclear line by using a universal meter in the prior art, the accuracy is poor, or the nuclear line is performed by using the existing professional nuclear line device, but the nuclear line is inconvenient to move on site and has high cost, the invention provides a multi-core secondary cable nuclear line device and a multi-core secondary cable nuclear line method based on variable frequency resonance, and aims to solve the technical problems.
In a first aspect, the invention provides a multi-core secondary cable core wire device based on variable frequency resonance, which comprises an LC resonance contact pin and a host, wherein the LC resonance contact pin and the host are respectively connected to two ends of a secondary cable to be core wire to form an LC series resonance circuit;
the LC resonance pin comprises an insulating shell, a plurality of metal pins, a first capacitor, a first inductor, a plurality of second capacitors, a plurality of second inductors and a metal link, wherein the metal pins are arranged at the top end of the insulating shell, the first capacitor, the first inductor, the plurality of second capacitors, the plurality of second inductors and the metal link are all arranged in the insulating shell, each metal pin is provided with a pin number which is respectively 1 to n, the metal pins with the pin number of 1 and the metal pins with the pin number of 2 are connected with one second capacitor through the metal link, a second inductor is connected between the metal pin with the pin number of 2 and the metal pin with the pin number of 3 through a metal link, a second capacitor and a second inductor are alternately arranged between the metal pin with the pin number of 3 and the metal pin with the pin number of n-3, a second capacitor is connected between the metal pin with the pin number of n-3 and the metal pin with the pin number of n-2 through a metal link, a first inductor is connected between the metal pin with the pin number of n-2 and the metal pin with the pin number of n-1 through a metal link, and a first capacitor is connected between the metal pin with the pin number of n-1 and the metal pin with the pin number of n-1 through a metal link;
the host comprises a logic control module, wherein the logic control module comprises n pairs of normally open contacts and normally closed contacts for controlling the change of the resonant circuit structure, and each pair of normally open contacts and normally closed contacts is correspondingly connected with one metal contact pin.
According to the technical scheme, the LC resonance pins further comprise cable jacks with the same number as the metal pins, the cable jacks are arranged at the bottom end of the metal shell, each cable jack corresponds to one metal pin, and the cable jacks are connected to corresponding metal pins through metal links.
According to the technical scheme, each cable jack is provided with a fastening screw and a fastening elastic piece, the fastening elastic pieces are arranged in the cable jack, the axial direction of the fastening screw and the axial direction of the cable jack are perpendicular, and one end of the fastening screw is connected with the side face of the fastening elastic piece.
Further improvements in this solution are that the pin numbers are marked on the metal casing above the corresponding fastening screws.
The technical scheme is further improved, and the cable connector further comprises a host cable interface, wherein the host is connected to the secondary cable to be nucleated wire through the host cable interface.
Further improvement of the technical scheme is that the host comprises:
the power supply module is used for supplying power to the whole core wire device;
the sampling module is used for collecting the output voltage of the resonant circuit;
the logic control module is used for controlling the frequency of the output power supply, carrying out core wire on the secondary cable of the core wire according to the acquired output voltage, and outputting a core wire result;
and the display module is used for displaying the nuclear line result.
The technical scheme is further improved, and the power supply module comprises a full-bridge rectifying circuit and a full-bridge inverter circuit; the full-bridge rectifier circuit provides a direct current power supply for the resonant circuit, and the full-bridge inverter circuit provides an alternating current power supply for the resonant circuit.
In a second aspect, the present invention provides a method for forming a core of a multi-core secondary cable based on variable frequency resonance, including:
setting pin numbers of 1 to n for a plurality of metal pins arranged on the LC resonance pins;
the LC resonance contact pin is sequentially connected with one end wire core of the secondary cable of the wire to be nucleated through the sequence of the contact pin number, and the host is connected with the other end wire core of the secondary cable of the wire to be nucleated through a host cable interface, so that a multicore secondary cable core equivalent circuit can be formed, and the multicore secondary cable core equivalent circuit comprises an LC series resonance circuit, normally open switches T1 to Tn, normally closed switches T1 to Tn, a sampling resistor R1, a direct current switch Tdc, a direct current power supply, an alternating current switch Tac and an alternating current power supply;
the method comprises the steps that a direct current switch pdc is connected to a direct current power supply for a resonance circuit, normally open switches T1 to Tn are sequentially closed, corresponding normally closed switches T1 to Tn are sequentially opened, voltage values on a sampling resistor R1 are sequentially measured and recorded respectively, a No. 1 wire core and a No. n wire core of a secondary cable to be nucleated, which are correspondingly connected with a No. 1 metal contact pin and a No. n metal contact pin, are analyzed, corresponding wire cores of the No. 1 wire core and the No. n wire core at a host end of the secondary cable to be nucleated, and power-on associated cores of other wire cores in the secondary cable to be nucleated are analyzed, and temporary classification marking is carried out;
after the direct current switch Tdc is opened, the alternating current switch Tac is connected with a sinusoidal alternating current power supply with a first preset frequency for a resonance circuit, at the moment, normally open switches T1 to Tn and normally closed switches T1 to Tn in an equivalent circuit are not connected, normally open switches T1 are closed, normally closed switches T2 to Tn-1 are sequentially connected, voltage values on a sampling resistor R1 are respectively measured and recorded, normally open switches Tn are closed, normally closed switches T2 to Tn-1 are sequentially connected, voltage values on the sampling resistor R1 are respectively measured and recorded, a 1 'wire core corresponding to a 1 wire core at a secondary cable host end of a wire to be nucleated is determined, a n' wire core corresponding to a n-2 wire core at a secondary cable host end of the wire to be nucleated is determined, a n-1 'wire core corresponding to a n-2 wire core at a secondary cable host end of the wire to be nucleated is determined, and a n-1' wire core corresponding to a n-1 wire core at a secondary cable host end of the wire to be nucleated is determined;
the resonance circuit is connected with a sinusoidal alternating current power supply with a second preset frequency, at the moment, normally open switches T1 to Tn-3 and normally closed switches T1 to Tn-3 in the equivalent circuit are not connected, the normally open switch T1 is closed, normally closed switches T2 to Tn-3 are sequentially connected, voltage values on a sampling resistor R1 are respectively measured and recorded, after the normally open switch T1 is opened, the normally open switch T3 is closed, normally closed switches T4 to Tn-3 are sequentially connected, voltage values on the sampling resistor R1 are respectively measured and recorded, a number 3 wire core to a number n-3 wire core are sequentially determined, a wire core corresponding to a secondary cable host end to be a nuclear line is determined, and a determination mark is made.
The invention has the beneficial effects that:
1. the device is simple and convenient to operate, and only needs a single person to perform nuclear line operation. After the metal contact pins are inserted into the existing terminal blocks, the host computer is opened to quickly and accurately check the wires, so that the wire checking machine is convenient and quick, and manpower and material resources are saved.
2. The nuclear line structure of the device is stable and accurate. The device performs core line by accessing a power supply module (steady-state power supply) and changing a circuit structure, voltage in the whole circuit is stably distributed in one sampling period, a pulse wave head is not required to be captured, a stable and accurate measurement result can be obtained, and the core line is more stable and reliable.
3. The device has good portability. The LC resonance contact pin can be carried without being connected with a power supply and put into a pocket, and is convenient to insert and use.
4. The device has low cost. The LC resonance contact pin is formed by connecting capacitive and inductive elements, and the elements are low in cost, simple and easy to obtain. Compared with other nuclear line devices, the LC resonance pin is passive, does not need to be connected with a power supply and a precise signal receiving module, so that the manufacturing cost is greatly reduced.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of the connection relationship of the device.
Fig. 2 is a schematic structural diagram of an LC resonant pin.
Fig. 3 is a schematic diagram of the structure of the inside of the LC resonant pin.
Fig. 4 is an equivalent circuit diagram of the device.
Fig. 5 is a schematic circuit diagram of a power module.
Fig. 6 is a schematic flow chart of the multi-core secondary cable core line method.
110 is LC resonance pin, 111 is insulating shell, 112 is metal pin, C is first electric capacity, L is first electric capacity, cn is second electric capacity, ln is second electric capacity, 113 is metal link, 114 is cable jack, 115 is fastening screw, 120 is host computer, 130 is waiting to core the line secondary cable.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The following explains key terms appearing in the present invention.
LC resonance, L is inductance, C is capacitance, capacitance and inductance are connected in series, capacitor discharges, inductance begins to have a reverse recoil current, inductance charges; when the voltage of the inductor reaches the maximum, the capacitor is discharged, and then the inductor starts to discharge and the capacitor starts to charge, so that the reciprocating operation is called resonance.
As shown in fig. 1, the multi-core secondary cable core wire device based on variable frequency resonance provided by the embodiment of the invention comprises an LC resonance contact pin 110 and a host 120, wherein the LC resonance contact pin 110 and the host 120 are respectively connected to two ends of a secondary cable 130 to be core wire to form an LC series resonance circuit.
As shown in fig. 2 and 3, the LC resonant pin includes an insulating housing, a plurality of metal pins, a first capacitor, a first inductor, a plurality of second capacitors, a plurality of second inductors and a metal link, the metal pins are disposed at the top end of the insulating housing, the first capacitor, the first inductor, the plurality of second capacitors, the plurality of second inductors and the metal link are all disposed inside the insulating housing, in order to facilitate the ordered core line operation in the later stage, each metal pin is configured with a pin number of 1 to n, a second capacitor is connected between the metal pin with pin number 1 and the metal pin with pin number 2 through the metal link, a second inductor is connected between the metal pin with pin number 2 and the metal pin with pin number 3 through the metal link, the second capacitor and the second inductor are alternately disposed between the metal pin with pin number 3 and the metal pin with pin number n-3, the metal pin with pin number n-2 is connected between the metal pin with pin number 1 and the metal pin with pin number 2 through the metal link, and the metal pin with pin number n-3 is connected between the metal pin with pin number 1 and the metal link through the metal link with pin number n-2 through the metal link. The inductance values of the first inductor and the second inductor are different, and the capacitance values of the first capacitor and the second capacitor are also different.
In addition, the LC resonance pins further comprise cable jacks, the number of which is the same as that of the metal pins, the cable jacks are arranged at the bottom end of the metal shell, each cable jack corresponds to one metal pin, and the cable jacks are connected to the corresponding metal pins through metal links; each cable jack is provided with a fastening screw and a fastening elastic piece, the fastening elastic pieces are arranged in the cable jacks, the axial direction of the fastening screw and the axial direction of the cable jacks are perpendicular, one end of the fastening screw is connected with the side face of the fastening elastic piece, and the pin numbers are marked on the metal shell above the corresponding fastening screw.
When the cable is used, if the secondary cable to be nucleated is already connected to the field terminal strip, the metal contact pin is directly inserted into the cable to be nucleated terminal jack on the field terminal strip; if the secondary cable to be nucleated is not connected to the field terminal strip, the wire cores of the secondary cable to be nucleated are respectively connected to the cable jacks, and are tightly pressed by the fastening elastic sheets and the fastening screws, so that the wire cores are prevented from falling off in the process of nucleated.
In order to improve connection reliability, the device also comprises a host cable interface, and the host is connected to the secondary cable of the wire to be nucleated through the host cable interface.
After the wire cores at two ends of the secondary cable to be nucleated are respectively connected into the LC resonance contact pin and the host, the secondary cable to be nucleated, the LC resonance contact pin and the host form an equivalent circuit as shown in fig. 4, and when the wire is plugged, the LC resonance contact pin must be correspondingly inserted into the terminal row according to the sequence of the contact pin numbers on the insulating shell, and the terminal row cannot be reversed.
Specifically, the host comprises a power supply module, a sampling module, a logic control module and a display module, wherein the power supply module is used for supplying power to the whole nuclear line device, and as shown in fig. 5, the power supply module consists of an external 220V alternating current power supply, a full-bridge rectifying circuit and a full-bridge inverter circuit and is responsible for outputting a direct current power supply DC or an alternating current power supply AC to the resonant circuit; the full-bridge rectifier circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1 and a direct current switch Tdc, and the full-bridge inverter circuit comprises a thyristor Q1, a thyristor Q2, a thyristor Q3, a thyristor Q4, an inductor L1, a capacitor C2 and an alternating current switch Tac.
The sampling module is used for collecting the output voltage of the resonant circuit, and consists of a sampling resistor R1 in fig. 4 and voltage measuring devices (adopting voltmeters) connected in parallel at two ends of the sampling resistor R1, and when the equivalent circuit structure changes, the effective voltage values at two ends of the sampling resistor R1 are input to the logic control module for analysis.
The logic control module is used for controlling and changing the structure of the resonant circuit and the frequency of the output power supply, carrying out core wire on the secondary cable of the core wire according to the acquired output voltage, and outputting a core wire result; specifically, the logic control module changes the on-off frequency of the thyristors Q1 to Q4 in the full-bridge inverter circuit through different control strategies, and can output alternating voltage with different frequencies. The logic control module consists of a high-performance singlechip or a control chip and mainly realizes the following functions: 1. different resonance circuits are constructed by controlling the on-off of a plurality of normally open switches T1 to Tn and a plurality of normally closed switches T1 to Tn in the circuit; 2. outputting a direct current or variable frequency alternating current power supply to the resonant circuit by controlling the on-off of the direct current switch pdc, the alternating current switch Tac and the thyristors Q1 to Q4; 3. and collecting sampling values of the sampling module and outputting a nuclear line result to the display module.
The display module is connected with the logic control module by selecting an LED display screen and outputs a core wire result of the secondary cable to be core wire.
Fig. 6 is a schematic flow chart of a method of one embodiment of the invention. The execution body of fig. 6 is a host.
As shown in fig. 6, the method includes:
step 610, setting pin numbers of 1 to n for a plurality of metal pins arranged on the LC resonance pins;
step 620, sequentially connecting the LC resonance pins with one end core of the secondary cable to be nucleated, and connecting the host with the other end core of the secondary cable to be nucleated through the host cable interface, so as to form a multicore secondary cable nucleated line equivalent circuit, wherein the multicore secondary cable nucleated line equivalent circuit comprises an LC series resonance circuit, normally open switches T1 to Tn, normally closed switches T1 to Tn, a sampling resistor R1, a dc switch Tdc, a dc power supply, an ac switch Tac and an ac power supply;
step 630, closing the direct current switch Tdc to connect the resonant circuit to the direct current power supply, sequentially closing the normally open switches T1 to Tn, sequentially opening the corresponding normally closed switches T1 to Tn, sequentially measuring and recording the voltage values on the sampling resistor R1, respectively, analyzing the number 1 wire core and the number n wire core of the secondary cable to be nucleated wire, which are correspondingly connected with the number 1 metal contact pin and the number n metal contact pin, and the corresponding wire cores of the number 1 wire core and the number n wire core at the host end of the secondary cable to be nucleated wire, analyzing the power-on associated cores of the rest wire cores in the secondary cable to be nucleated wire, and performing temporary classification marking;
step 640, after the dc switch Tdc is turned off, the ac switch Tac is turned on a sinusoidal ac power supply with a first preset frequency for the resonant circuit, at this time, the normally open switches T1 to Tn and the normally closed switches T1 to Tn in the equivalent circuit are not turned on, the normally open switch T1 is turned on sequentially, the normally closed switches T2 to Tn-1 are respectively measured and recorded, the normally open switch T1 is turned off, the normally closed switches T2 to Tn-1 are sequentially turned on, the voltage value on the sampling resistor R1 is respectively measured and recorded, the 1 'wire core corresponding to the 1 wire core at the secondary cable host end to be nucleated wire is determined, the n' wire core corresponding to the n wire core at the secondary cable host end to be nucleated wire is determined, the n-2 'wire core corresponding to the n-2 wire core at the secondary cable host end to be nucleated wire is determined, the n-1' wire core corresponding to the secondary cable host end to be nucleated wire is determined, and a determination mark is made;
step 650, a sinusoidal ac power supply with a second preset frequency is connected to the resonant circuit, at this time, the normally open switches T1 to Tn-3 and the normally closed switches T1 to Tn-3 in the equivalent circuit are not turned on, the normally open switches T1 are turned on sequentially, the normally closed switches T2 to Tn-3 are turned on sequentially, the voltage values on the sampling resistor R1 are measured and recorded respectively, after the normally open switch T1 is turned off, the normally open switches T3 are turned on sequentially, the normally closed switches T4 to Tn-3 are turned on sequentially, the voltage values on the sampling resistor R1 are measured and recorded respectively, the number 3 wire core to the number n-3 wire core are determined sequentially, and the wire core corresponding to the secondary cable host end to be nucleated wire is determined, and the determination mark is made.
In order to facilitate understanding of the present invention, the principle of the method for nuclear-wiring a multi-core secondary cable based on variable frequency resonance according to the present invention is used, and in combination with the process of nuclear-wiring a multi-core secondary cable based on variable frequency resonance in the embodiment and the equivalent circuit in fig. 4, the method for nuclear-wiring a multi-core secondary cable based on variable frequency resonance provided by the present invention is further described.
Specifically, the resonance contact pin is firstly connected with the secondary cable core of the wire to be nucleated according to the sequence of the contact pin number 1 … … n, and the same core corresponding to the host end is recorded as 1'… … n'. The core position and circuit structure on the resonant pin side are known, while the cable core access position on the host side is unknown. 1'… … n' only illustrates the correspondence of a core on the host side with the resonant pin side and does not represent the actual access location on the host side, in fact it may be accessed into any core socket on the host side.
And normally open switches T1 to Tn in the equivalent circuit are connected to a first end of a sampling resistor R1, a second end of the sampling resistor R1 is connected to a first end of a direct current switch pdc and a first end of an alternating current switch Tac, a second end of the direct current switch pdc is connected to a first end of a direct current power supply, a second end of the alternating current switch Tac is connected to a first end of an alternating current power supply, and a second end of the direct current power supply and a second end of the alternating current power supply are connected to normally closed switches T1 to Tn.
After the connection of the cables at the two ends is completed, the external power supply of the power supply module can be connected to start the core wire work. The epipolar line process is divided into three phases:
a first stage. The dc switch Tdc is closed and the ac switch Tac is opened. And a direct current power supply is connected into the resonant circuit. The normally open switches T1 … … Tn of the logic control module are sequentially and singly closed, and the normally closed switches T1 … … Tn are correspondingly and sequentially opened at the same time, for example, when T1 is closed, T1 is opened at the same time, and the rest contacts do not act. The voltage value on the sampling resistor R1 is measured in turn.
Due to the characteristic of the capacitor of blocking the direct current, when the T1 is switched on, the T1 is switched off, or the Tn is switched on and the Tn is switched off, no current exists in the loop, and the measuring module measures that no voltage exists on the sampling resistor R1. In other cases, when a group of the groups of the circuits are in action, the action circuit and the adjacent circuit can form a current conduction circuit, so that the sampling resistor R1 is provided with a voltage. If T2 is closed and T2 is open, a loop can be formed: power supply positive electrode, R, T2, 2', 2, L, 3', T3 and power supply negative electrode. That is, when the 2'… … n-1' core is connected to the power supply, another core is always charged simultaneously by the host, and the core which is charged simultaneously is called an associated core of the energized core. Such as 2 'and 3', 4 'and 5', n-2 'and n-1' in fig. 4, etc. are associated cores. The associated core must be connected across the inductive element.
And a second stage. The initial state in the circuit is T1 … … Tn, T1 … … Tn are all disconnected, and the circuit is all non-conductive. And then the pdc is opened, the Tac is closed, and the sinusoidal alternating current with the first preset frequency is accessed into the resonant circuit. First, T1 is closed, and at T2 … … tn-1, the voltage across the sampling resistor R1 is recorded. And then T1 is opened, after Tn is closed, T2 … … Tn-1 is closed again in sequence, and the voltage on the sampling resistor R1 is recorded. As known from the resonance principle, when Tn is closed and Tn-2 is closed, the loop is in series resonance, and the voltage on the sampling resistor R1 is about the effective value of the power supply voltage, and is the maximum value of voltage sampling. When T1 is switched on or TN is switched on and then the other loops except TN-2 are switched on, the voltage on the sampling resistor R1 is smaller than the voltage value when resonance occurs. So when the maximum sampling voltage occurs, it can be determined that the n 'wire core of the input power corresponds to the n wire core, and the n-2' wire core turned on by closing tn-2 corresponds to the n-2 wire core at the other end of the LC series resonant circuit. Once the n 'number of wire cores are determined, the corresponding relationship between the other 1' number of wire cores which are not provided with sampling voltage by direct current and the 1 number of wire cores can also be determined. Meanwhile, the associated n-1 'wire core of the n-2' wire core can also be determined to correspond to the n-1 wire core between the n-2 wire core and the n-2 wire core.
At this stage, the correspondence of the 4 cores may be determined. And then the power-on check is not conducted any more, and the logic control module directly outputs the core wire result to the display module.
And a third stage. In the equivalent circuit, the initial states T1 … … Tn-3 and T1 … … Tn-3 are not switched on, the input power supply frequency is changed to a second preset frequency, then T1 is switched on, T2 … … Tn-3 is sequentially switched on, the voltage on the sampling resistor R1 is measured, the maximum sampling voltage on the R1 is found to be about the power supply voltage when T3 is switched on, and therefore the 3' wire core corresponds to the 3 number wire core. The associated core of the 3 'wire core is the 2' wire core corresponding to the 2 wire core between the 1 wire core and the 3 wire core. And then closing the T1 opening T3, and sequentially closing the T4 … … tn-3, and sequentially checking the wire cores with undetermined positions in the same way. Until the checking of all the wire cores is finally completed.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The multi-core secondary cable nuclear line device based on variable frequency resonance is characterized by comprising an LC resonance contact pin and a host, wherein the LC resonance contact pin and the host are respectively connected to two ends of a secondary cable to be nuclear line to form an LC series resonance circuit;
the LC resonance pin comprises an insulating shell, a plurality of metal pins, a first capacitor, a first inductor, a plurality of second capacitors, a plurality of second inductors and a metal link, wherein the metal pins are arranged at the top end of the insulating shell, the first capacitor, the first inductor, the plurality of second capacitors, the plurality of second inductors and the metal link are all arranged in the insulating shell, each metal pin is provided with a pin number which is respectively 1 to n, the metal pins with the pin number of 1 and the metal pins with the pin number of 2 are connected with one second capacitor through the metal link, a second inductor is connected between the metal pin with the pin number of 2 and the metal pin with the pin number of 3 through a metal link, a second capacitor and a second inductor are alternately arranged between the metal pin with the pin number of 3 and the metal pin with the pin number of n-3, a second capacitor is connected between the metal pin with the pin number of n-3 and the metal pin with the pin number of n-2 through a metal link, a first inductor is connected between the metal pin with the pin number of n-2 and the metal pin with the pin number of n-1 through a metal link, and a first capacitor is connected between the metal pin with the pin number of n-1 and the metal pin with the pin number of n-1 through a metal link;
the host comprises a logic control module, wherein the logic control module comprises n pairs of normally open contacts and normally closed contacts for controlling the change of the resonant circuit structure, and each pair of normally open contacts and normally closed contacts is correspondingly connected with one metal contact pin;
the inductance values of the first inductor and the second inductor are different, and the capacitance values of the first capacitor and the second capacitor are also different.
2. The variable frequency resonance-based multi-core secondary cable core line device according to claim 1, wherein the LC resonance pins further comprise cable insertion holes of the same number as the metal pins, the cable insertion holes are provided at the bottom end of the metal housing, each cable insertion hole corresponds to one metal pin, and the cable insertion holes are connected to the corresponding metal pins through metal links.
3. The variable frequency resonance-based multi-core secondary cable core device according to claim 2, wherein each cable jack is provided with a fastening screw and a fastening spring piece, the fastening spring pieces are arranged in the cable jack, the axial direction of the fastening screw and the axial direction of the cable jack are perpendicular, and one end of the fastening screw is connected with the side face of the fastening spring piece.
4. A variable frequency resonance based multi-core secondary cable core line device according to claim 3, wherein pin numbering is indicated on the metal housing above the corresponding fastening screw.
5. The variable frequency resonance-based multi-core secondary cable core line device of claim 1, further comprising a host cable interface through which the host is connected to the secondary cable to be core line.
6. The variable frequency resonance-based multi-core secondary cable core line device of claim 1, wherein the host comprises:
the power supply module is used for supplying power to the whole core wire device;
the sampling module is used for collecting the output voltage of the resonant circuit;
the logic control module is used for controlling the frequency of the output power supply, carrying out core wire on the secondary cable of the core wire according to the acquired output voltage, and outputting a core wire result;
and the display module is used for displaying the nuclear line result.
7. The variable frequency resonance-based multi-core secondary cable core line device of claim 6, wherein the power module comprises a full-bridge rectifying circuit and a full-bridge inverter circuit; the full-bridge rectifier circuit provides a direct current power supply for the resonant circuit, and the full-bridge inverter circuit provides an alternating current power supply for the resonant circuit.
8. A method of a variable frequency resonance based multicore secondary cable core device according to any of the claims 1-7, comprising:
setting pin numbers of 1 to n for a plurality of metal pins arranged on the LC resonance pins;
the LC resonance contact pin is sequentially connected with one end wire core of the secondary cable of the wire to be nucleated through the sequence of the contact pin number, and the host is connected with the other end wire core of the secondary cable of the wire to be nucleated through a host cable interface, so that a multicore secondary cable core equivalent circuit can be formed, and the multicore secondary cable core equivalent circuit comprises an LC series resonance circuit, normally open switches T1 to Tn, normally closed switches T1 to Tn, a sampling resistor R1, a direct current switch Tdc, a direct current power supply, an alternating current switch Tac and an alternating current power supply;
the method comprises the steps that a direct current switch pdc is connected to a direct current power supply for a resonance circuit, normally open switches T1 to Tn are sequentially closed, corresponding normally closed switches T1 to Tn are sequentially opened, voltage values on a sampling resistor R1 are sequentially measured and recorded respectively, a No. 1 wire core and a No. n wire core of a secondary cable to be nucleated, which are correspondingly connected with a No. 1 metal contact pin and a No. n metal contact pin, are analyzed, corresponding wire cores of the No. 1 wire core and the No. n wire core at a host end of the secondary cable to be nucleated, and power-on associated cores of other wire cores in the secondary cable to be nucleated are analyzed, and temporary classification marking is carried out;
after the direct current switch Tdc is opened, the alternating current switch Tac is connected with a sinusoidal alternating current power supply with a first preset frequency for a resonance circuit, at the moment, normally open switches T1 to Tn and normally closed switches T1 to Tn in an equivalent circuit are not connected, normally open switches T1 are closed, normally closed switches T2 to Tn-1 are sequentially connected, voltage values on a sampling resistor R1 are respectively measured and recorded, normally open switches Tn are closed, normally closed switches T2 to Tn-1 are sequentially connected, voltage values on the sampling resistor R1 are respectively measured and recorded, a 1 'wire core corresponding to a 1 wire core at a secondary cable host end of a wire to be nucleated is determined, a n' wire core corresponding to a n-2 wire core at a secondary cable host end of the wire to be nucleated is determined, a n-1 'wire core corresponding to a n-2 wire core at a secondary cable host end of the wire to be nucleated is determined, and a n-1' wire core corresponding to a n-1 wire core at a secondary cable host end of the wire to be nucleated is determined;
the resonance circuit is connected with a sinusoidal alternating current power supply with a second preset frequency, at the moment, normally open switches T1 to Tn-3 and normally closed switches T1 to Tn-3 in the equivalent circuit are not connected, the normally open switch T1 is closed, normally closed switches T2 to Tn-3 are sequentially connected, voltage values on a sampling resistor R1 are respectively measured and recorded, after the normally open switch T1 is opened, the normally open switch T3 is closed, normally closed switches T4 to Tn-3 are sequentially connected, voltage values on the sampling resistor R1 are respectively measured and recorded, a number 3 wire core to a number n-3 wire core are sequentially determined, a wire core corresponding to a secondary cable host end to be a nuclear line is determined, and a determination mark is made.
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