CN112968617A - Power supply circuit for alternating-current transmission line on-line monitoring device - Google Patents
Power supply circuit for alternating-current transmission line on-line monitoring device Download PDFInfo
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- CN112968617A CN112968617A CN202110146119.XA CN202110146119A CN112968617A CN 112968617 A CN112968617 A CN 112968617A CN 202110146119 A CN202110146119 A CN 202110146119A CN 112968617 A CN112968617 A CN 112968617A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
Abstract
The invention belongs to the technical field of electric power, and discloses a power supply circuit for an on-line monitoring device of an alternating-current transmission line, which comprises a resonant inductor, a resonant capacitor, a first rectifier bridge, a fully-controlled switch device, a second rectifier bridge, a filter inductor, an on-line monitoring device and two lead-out wires; the full-control type switch device is characterized in that the supply range of power can be controlled. The invention has the following main beneficial effects: the circuit has simple structure and is easy to manufacture; electricity is convenient to get and the electric power is adjustable; wide application range, convenient use and low cost.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a power supply circuit for an alternating-current transmission line on-line monitoring device.
Background
With the continuous improvement of the operation and maintenance level of the power transmission line, the application of the device for online monitoring and evaluation of the state of the power transmission line is also becoming more and more extensive. However, the power transmission line has a high voltage level, and the electric energy of the power transmission line cannot be directly used, so that the power supply problem of the online device is not effectively solved, and the prior art has the following two types:
(1) and new energy sources such as solar energy, wind energy and the like are utilized to generate electricity and obtain energy on site. In the method, a power generation device is usually arranged on the power transmission pole tower, the size is large, the power supply is easily influenced by weather, and the power generation device is usually matched with a storage battery for use; on the other hand, when the power is supplied by using the method, the online monitoring device can only be arranged on a tower, and the flexible monitoring at any position of the power transmission line cannot be realized.
(2) And (6) induction energy obtaining. The coil is arranged on the power transmission lead by utilizing the principle of electromagnetic induction, an alternating magnetic field is generated when alternating current flows through the power transmission lead, and the coil in the alternating magnetic field generates induced potential to obtain electric energy. Although the method can stably obtain the electric energy, the method can only obtain smaller power, and the power requirement of most online monitoring devices is difficult to meet.
Typical techniques in the prior art are disclosed in the following publications.
CN104184221A discloses a high tension transmission line ground wire energy taking device, it includes mutual-inductor, EMI wave filter, overvoltage crowbar, rectifier circuit block and filter circuit, the ground wire of high tension transmission line passes the mutual-inductor, the mutual-inductor obtains alternating current power, the output of mutual-inductor is connected with EMI wave filter, EMI wave filter filtering common mode interference and differential mode interference, the output of EMI wave filter is connected with overvoltage crowbar, overvoltage crowbar has lightning protection effect, and protect the energy taking device not hit by the surge, overvoltage crowbar's output is connected with rectifier circuit, rectifier circuit rectifies alternating current power supply into direct current power supply, rectifier circuit's output is connected with filter circuit, filter circuit further filters the clutter of direct current, filter circuit's output is connected with on-line supervisory equipment.
CN 207150234U discloses transmission line check out test set's electrical power generating system, and this system provides continuous reliable power, has solved the unstable problem of power supply that present solar panel brought for storage battery charging technique prisoner's weather and climate environmental change. The sound-absorbing plate is utilized to reduce the noise of the whole device, thereby reducing the environmental noise pollution caused by the operation of the device, and the anti-theft of the whole device is realized by designing the unconventional bolt technology. Compared with the prior power supply technology of the on-line monitoring equipment of the power transmission line, the whole power supply device has low installation height, and the cost and the efficiency of on-site installation and maintenance are improved.
CN 106549589A discloses overhead transmission line's electric installation of getting, includes: the electromagnetic induction monitoring device comprises an electromagnetic induction module, a first rectifying circuit, a direct current chopper and a second rectifying circuit, wherein the first rectifying circuit is connected between the electromagnetic induction module and the direct current chopper, the direct current chopper is connected between the first rectifying circuit and the second rectifying circuit, and the second rectifying circuit is connected with an external online monitoring device. The magnetic induction module is arranged in a variable magnetic field of the overhead transmission line to induce the variable magnetic field to obtain alternating-current voltage, the alternating-current voltage is rectified by the first rectifying circuit, the direct-current chopper is used for reducing the voltage, the second rectifying circuit is used for secondary rectification, and the direct-current voltage is obtained and then output to an external online monitoring device, so that electric energy is provided for the external online monitoring device, operation under the condition of sufficient electric energy is guaranteed, and safe operation is guaranteed.
CN 204538827U discloses a power supply device for on-line monitoring equipment of power transmission line, which includes an open-loop current transformer, a rectifying and filtering circuit, a current energy-taking circuit, an overvoltage protection circuit, a battery charging and discharging circuit and monitoring equipment. The open-loop current transformer surrounding the power transmission line comprises an open-loop magnetic core and a mutual inductor group wound on the magnetic core, a battery charging and discharging circuit connected with a DC/DC circuit comprises a first diode, a second diode and a third diode, when the voltage of the current energy-taking circuit is in a first preset value, the battery is charged through the first diode, the monitoring equipment is powered through the second diode, when the voltage of the current energy-taking circuit is smaller than the first preset value, the first diode prevents the current from flowing backwards, and the battery supplies power to the monitoring equipment through the third diode.
CN 204068435U discloses a transmission line directly gets electric installation, belongs to high tension transmission line on-line monitoring technical field. The utility model has the open-close type energy-taking coil, which is directly clamped on the high-voltage transmission line to obtain electricity by induction, and the induced alternating voltage outputs direct current after passing through the front-end impact protection circuit and the rectification filter circuit, thereby providing enough energy for the DC/DC module; still be connected with voltage sampling circuit and protection circuit between rectifier filter circuit and DC/DC module, when can guaranteeing that the electric energy that the response was gone out exceedes needs, rear end acquisition system's safe operation, DC/DC module and group battery charging power supply management module are connected simultaneously, through group battery charging management, in case when the electric energy was not enough in the induction electricity of getting, can guarantee monitoring facilities's normal operating. The utility model discloses replace solar cell as monitoring instrument power, ensured monitoring instrument's power supply, greatly reduced the maintenance cost.
CN 202424548U discloses an energy-taking unit and a passive high-voltage online monitoring device, wherein the device comprises a current sensor, a pulse generator, an energy-taking unit, a central processing unit and a transceiving unit; the energy obtaining unit directly obtains energy from the high-voltage transmission line to supply power to the central processing unit, the central processing unit receives the analog small signal output by the current sensor and the pulse signal output by the pulse generator and calculates to obtain the current value and the voltage value of the high-voltage transmission line, and the central processing unit uploads the current value and the voltage value through the transceiving unit. The energy taking unit has the advantages of no energy taking blind area, convenient energy taking, reliable power output and the like; the passive high-voltage online monitoring device can realize real-time online monitoring of parameters such as voltage and current, can be transmitted to a main control device or a remote control unit through the transceiving unit for management, and has the advantages of wide measurement range, high precision, low cost and the like.
Therefore, the technical problem is urgently needed to be solved in the technical field.
Disclosure of Invention
In order to solve the above problems, the present invention discloses a power supply circuit for an on-line monitoring device of an ac power transmission line, which is implemented by the following technical scheme.
A power supply circuit for an on-line monitoring device of an alternating current transmission line is provided with a resonant inductor, a resonant capacitor, a first rectifier bridge, a fully-controlled switch device, a second rectifier bridge, a filter inductor, an on-line monitoring device R and two lead-out wires; it is characterized in that the first rectifier bridge is composed of a first rectifier diode of the first rectifier bridge, a second rectifier diode of the first rectifier bridge, a third rectifier diode of the first rectifier bridge and a fourth rectifier diode of the first rectifier bridge, the cathode of the first rectifier diode of the first rectifier bridge is connected with the anode of the second rectifier diode of the first rectifier bridge, the anode of the first rectifier diode of the first rectifier bridge is connected with the anode of the third rectifier diode of the first rectifier bridge, the cathode of the third rectifier diode of the first rectifier bridge is connected with the anode of the fourth rectifier diode of the first rectifier bridge, the cathode of the second rectifier diode of the first rectifier bridge is connected with the cathode of the fourth rectifier diode of the first rectifier bridge, the emitter of the fully-controlled switch device is connected with the anode of the first rectifier diode of the first rectifier bridge, the collector of the fully-controlled switch device is connected with the cathode of the fourth rectifier diode of the first rectifier bridge, the negative electrode of a first rectifier diode of the first rectifier bridge is connected with one end of a resonant capacitor and one end of a resonant inductor, the other end of the resonant inductor is connected with one end of a lead-out wire, and the other end of the resonant capacitor is connected with the negative electrode of a third rectifier diode of the first rectifier bridge; the second rectifier bridge is composed of a first rectifier diode of the second rectifier bridge, a second rectifier diode of the second rectifier bridge, a third rectifier diode of the second rectifier bridge and a fourth rectifier diode of the second rectifier bridge, the cathode of the first rectifier diode of the second rectifier bridge is connected with the anode of the second rectifier diode of the second rectifier bridge, the anode of the first rectifier diode of the second rectifier bridge is connected with the anode of the third rectifier diode of the second rectifier bridge, the cathode of the third rectifier diode of the second rectifier bridge is connected with the anode of the fourth rectifier diode of the second rectifier bridge, the cathode of the second rectifier diode of the second rectifier bridge is connected with the cathode of the fourth rectifier diode of the second rectifier bridge, one end of the filter inductor is connected with the anode of the first rectifier diode of the second rectifier bridge, the other end of the filter inductor is connected with one end of the on-line monitoring device, the other end of the on-line monitoring device is connected with the cathode of a fourth rectifier diode of the second rectifier bridge, the cathode of a first rectifier diode of the second rectifier bridge is connected with the other end of the resonant capacitor, and the cathode of a third rectifier diode of the second rectifier bridge is connected with one end of the other lead-out wire; when the power supply circuit for the on-line monitoring device of the alternating current transmission line supplies power, the other end of one leading-out wire is connected to the three-phase alternating current transmission line or the alternating current transmission line, the connection point is a first connection point of the power supply circuit and the power transmission wire, the other end of the other leading-out wire is connected to the three-phase alternating current transmission line or the alternating current transmission line, the connection point is a second connection point of the power supply circuit and the power transmission wire, and the first connection point and the second connection point are on the same phase.
A power supply circuit for an on-line monitoring device of an alternating current transmission line is provided with a resonant inductor, a resonant capacitor, a first rectifier bridge, a fully-controlled switch device, a second rectifier bridge, a filter inductor, an on-line monitoring device and two lead-out wires; it is characterized in that the first rectifier bridge is composed of a first rectifier diode of the first rectifier bridge, a second rectifier diode of the first rectifier bridge, a third rectifier diode of the first rectifier bridge and a fourth rectifier diode of the first rectifier bridge, the cathode of the first rectifier diode of the first rectifier bridge is connected with the anode of the second rectifier diode of the first rectifier bridge, the anode of the first rectifier diode of the first rectifier bridge is connected with the anode of the third rectifier diode of the first rectifier bridge, the cathode of the third rectifier diode of the first rectifier bridge is connected with the anode of the fourth rectifier diode of the first rectifier bridge, the cathode of the second rectifier diode of the first rectifier bridge is connected with the cathode of the fourth rectifier diode of the first rectifier bridge, the emitter of the fully-controlled switch device is connected with the anode of the first rectifier diode of the first rectifier bridge, the collector of the fully-controlled switch device is connected with the cathode of the fourth rectifier diode of the first rectifier bridge, the negative electrode of a first rectifier diode of the first rectifier bridge is connected with one end of a resonant capacitor and one end of a resonant inductor, the other end of the resonant inductor is connected with one end of a lead-out wire, and the other end of the resonant capacitor is connected with the negative electrode of a third rectifier diode of the first rectifier bridge; the second rectifier bridge is composed of a first rectifier diode of the second rectifier bridge, a second rectifier diode of the second rectifier bridge, a third rectifier diode of the second rectifier bridge and a fourth rectifier diode of the second rectifier bridge, the cathode of the first rectifier diode of the second rectifier bridge is connected with the anode of the second rectifier diode of the second rectifier bridge, the anode of the first rectifier diode of the second rectifier bridge is connected with the anode of the third rectifier diode of the second rectifier bridge, the cathode of the third rectifier diode of the second rectifier bridge is connected with the anode of the fourth rectifier diode of the second rectifier bridge, the cathode of the second rectifier diode of the second rectifier bridge is connected with the cathode of the fourth rectifier diode of the second rectifier bridge, one end of the filter inductor is connected with the anode of the first rectifier diode of the second rectifier bridge, the other end of the filter inductor is connected with one end of the on-line monitoring device, the other end of the on-line monitoring device is connected with the cathode of a fourth rectifier diode of the second rectifier bridge, the cathode of a first rectifier diode of the second rectifier bridge is connected with the other end of the resonant capacitor, and the cathode of a third rectifier diode of the second rectifier bridge is connected with one end of the other lead-out wire; when the power supply circuit for the alternating current transmission line on-line monitoring device supplies power, the other end of one leading-out lead is connected to a three-phase alternating current transmission line or an alternating current transmission line, the connection point is a first connection point of the power supply circuit and a power transmission lead, the other end of the other leading-out lead is connected to the three-phase alternating current transmission line or the alternating current transmission line, the connection point is a second connection point of the power supply circuit and the power transmission lead, and the first connection point and the second connection point are on different phases of leads.
In the present application, the fully-controlled switching device can control the supply range of power.
The invention has the following main beneficial effects: the circuit has simple structure and is easy to manufacture; electricity is convenient to get and the electric power is adjustable; wide application range, convenient use and low cost.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment 1.
Fig. 2 is a schematic current flow diagram of the fully-controlled switching device in fig. 1 in an off mode.
Fig. 3 is a schematic current flow diagram of the fully-controlled switching device in fig. 1 in the on mode.
Fig. 4 is a schematic circuit structure diagram of embodiment 2.
In order that those skilled in the art will more accurately and clearly understand and practice the present application, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which: the system comprises an A-A alternating current transmission line, a B-B alternating current transmission line, a C-C alternating current transmission line, an L1-resonant inductor, a C1-resonant capacitor, a D1-a first rectifying diode of a first rectifying bridge, a D2-a second rectifying diode of the first rectifying bridge, a D3-a third rectifying diode of the first rectifying bridge, a D4-a fourth rectifying diode of the first rectifying bridge, an S-full-control type switching device, a D5-a first rectifying diode of a second rectifying bridge, a D6-a second rectifying diode of the second rectifying bridge, a D7-a third rectifying diode of the second rectifying bridge, a D8-a fourth rectifying diode of the second rectifying bridge, a L2-filter inductor, an R-online monitoring device, a first connection point of an m-power supply circuit and a power transmission lead, and a second connection point of the n-power supply circuit and the power transmission lead.
Detailed Description
Examples 1
Referring to fig. 1 to 3, a power supply circuit for an on-line monitoring device of an ac power transmission line includes a resonant inductor L1, a resonant capacitor C1, a first rectifier bridge, a fully-controlled switching device S, a second rectifier bridge, a filter inductor L2, an on-line monitoring device R, and two lead-out wires; the full-controlled switching device is characterized in that the first rectifier bridge is composed of a first rectifier diode D1 of the first rectifier bridge, a second rectifier diode D2 of the first rectifier bridge, a third rectifier diode D3 of the first rectifier bridge and a fourth rectifier diode D4 of the first rectifier bridge, the cathode of the first rectifier diode D1 of the first rectifier bridge is connected with the anode of the second rectifier diode D2 of the first rectifier bridge, the anode of the first rectifier diode D1 of the first rectifier bridge is connected with the anode of the third rectifier diode D3 of the first rectifier bridge, the cathode of the third rectifier diode D3 of the first rectifier bridge is connected with the anode of the fourth rectifier diode D4 of the first rectifier bridge, the cathode of the second rectifier diode D2 of the first rectifier bridge is connected with the anode of the fourth rectifier diode D4 of the first rectifier bridge, the emitter of the full-controlled switching device S is connected with the anode of the first rectifier diode D1 of the first rectifier bridge, a collector of the fully-controlled switching device S is connected with a cathode of a fourth rectifier diode D4 of the first rectifier bridge, a cathode of a first rectifier diode D1 of the first rectifier bridge is connected with one end of a resonant capacitor C1 and one end of a resonant inductor L1, the other end of the resonant inductor L1 is connected with one end of a lead-out wire, and the other end of the resonant capacitor C1 is connected with a cathode of a third rectifier diode D3 of the first rectifier bridge; the second rectifier bridge is composed of a first rectifier diode D5 of the second rectifier bridge, a second rectifier diode D6 of the second rectifier bridge, a third rectifier diode D7 of the second rectifier bridge and a fourth rectifier diode D8 of the second rectifier bridge, the cathode of the first rectifier diode D5 of the second rectifier bridge is connected with the anode of the second rectifier diode D6 of the second rectifier bridge, the anode of the first rectifier diode D5 of the second rectifier bridge is connected with the anode of the third rectifier diode D7 of the second rectifier bridge, the cathode of the third rectifier diode D7 of the second rectifier bridge is connected with the anode of the fourth rectifier diode D8 of the second rectifier bridge, the cathode of the second rectifier diode D6 of the second rectifier bridge is connected with the cathode of the fourth rectifier diode D8 of the second rectifier bridge, one end of a filter inductor L2 is connected with the anode of the first rectifier diode D5 of the second rectifier bridge, and the other end of the filter inductor L2 of the online monitoring device is connected with the online monitoring device, the other end of the online monitoring device R is connected with the cathode of a fourth rectifier diode D8 of the second rectifier bridge, the cathode of a first rectifier diode D5 of the second rectifier bridge is connected with the other end of the resonant capacitor C1, and the cathode of a third rectifier diode D7 of the second rectifier bridge is connected with one end of another lead-out wire;
when the power supply circuit for the on-line monitoring device of the alternating-current transmission line supplies power, the other end of one leading-out wire is connected to the three-phase A alternating-current transmission line, the B alternating-current transmission line or the C alternating-current transmission line, the connection point is a first connection point m of the power supply circuit and the power transmission wire, the other end of the other leading-out wire is connected to the three-phase A alternating-current transmission line, the B alternating-current transmission line or the C alternating-current transmission line, the connection point is a second connection point n of the power supply circuit and the power transmission wire, and m and.
The power supply circuit for the alternating current transmission line on-line monitoring device has the following working principle:
(1) the large current flowing through the power transmission conductor is set as I, and the small current flowing into the power supply circuit is set as I. The alternating current i sequentially flows through L1-C1 (or a first rectifier bridge-S) -a second rectifier bridge, is rectified into direct current through the second rectifier bridge, and is supplied to a load R for use after ripples are filtered by a filter inductor L2;
(2) if the angular frequency of the ac current of the power transmission line is ω and the impedance of the power supply circuit is Z, Z can be approximated to the impedance of the filter inductor L1 and the filter capacitor C1, that is:
according to the circuit theory common knowledge, the current i of the power supply circuit and the impedance Z of the power supply circuit are in a negative linear correlation relationship, namely the magnitude of i can be realized by adjusting Z;
(3) as shown in fig. 2, when the fully-controlled switching device S is turned off, the current flowing into the loop flows out through the resonant capacitor C1. At this time, the impedance of the loop is
The impedance of the whole power supply loop is Z;
as shown in fig. 3, when the fully-controlled switching device S is turned on, the resonant capacitor C1 is bypassed, and the current flowing into the loop is rectified by the first rectifier bridge, flows through the fully-controlled switching device S, and flows out without passing through the resonant capacitor C1. At this time, the impedance of the loop is 0, and the impedance of the whole power supply loop is determined by
Become into
。
(4) In terms of numerical design, the filter inductor L1 and the filter capacitor C1 form a resonance relationship with the current angular frequency ω of the power transmission line, that is, the following components are provided:
. According to the principle (3), when S is turned off, the impedance Z of the power supply loop is 0, and the current i can reach the maximum value; when S is on, the supply loop impedance Z increases to
The current i can then reach a minimum value. Therefore, increasing the on-time of the fully-controlled switching device S can decrease the output current of the power supply loop, and conversely, can increase the output current of the power supply loop. That is, by controlling the on-time of the fully-controlled switching device S, the power supply loop can output the current of the magnitude required by the on-line monitoring device.
M, n the impedance (resistance + capacitive reactance + inductive reactance) between two points is the ideal state, in practice there must exist very small impedance on the wire, and because the current on the transmission line is very large, even very small impedance can make m, n have certain voltage difference, namely will shunt some current in the circuit, so under the premise of high voltage, heavy current, the impedance of the wire can not be equal to 0 actually, but in this embodiment, it is especially suitable for high voltage line or high current line, high voltage line such as 10 kilovolt and above power supply line, for the mother transformer or the sub-transformer, the current of the output end is very large, this occasion is the heavy current occasion.
In this embodiment, if mn is out of phase, the current/voltage is too high, which may damage the power supply device.
EXAMPLES example 2
Referring to fig. 4 and fig. 1 and 2, a power supply circuit for an on-line monitoring device of an ac power transmission line includes a resonant inductor L1, a resonant capacitor C1, a first rectifier bridge, a fully-controlled switching device S, a second rectifier bridge, a filter inductor L2, an on-line monitoring device R, and two lead wires; the full-controlled switching device is characterized in that the first rectifier bridge is composed of a first rectifier diode D1 of the first rectifier bridge, a second rectifier diode D2 of the first rectifier bridge, a third rectifier diode D3 of the first rectifier bridge and a fourth rectifier diode D4 of the first rectifier bridge, the cathode of the first rectifier diode D1 of the first rectifier bridge is connected with the anode of the second rectifier diode D2 of the first rectifier bridge, the anode of the first rectifier diode D1 of the first rectifier bridge is connected with the anode of the third rectifier diode D3 of the first rectifier bridge, the cathode of the third rectifier diode D3 of the first rectifier bridge is connected with the anode of the fourth rectifier diode D4 of the first rectifier bridge, the cathode of the second rectifier diode D2 of the first rectifier bridge is connected with the anode of the fourth rectifier diode D4 of the first rectifier bridge, the emitter of the full-controlled switching device S is connected with the anode of the first rectifier diode D1 of the first rectifier bridge, a collector of the fully-controlled switching device S is connected with a cathode of a fourth rectifier diode D4 of the first rectifier bridge, a cathode of a first rectifier diode D1 of the first rectifier bridge is connected with one end of a resonant capacitor C1 and one end of a resonant inductor L1, the other end of the resonant inductor L1 is connected with one end of a lead-out wire, and the other end of the resonant capacitor C1 is connected with a cathode of a third rectifier diode D3 of the first rectifier bridge; the second rectifier bridge is composed of a first rectifier diode D5 of the second rectifier bridge, a second rectifier diode D6 of the second rectifier bridge, a third rectifier diode D7 of the second rectifier bridge and a fourth rectifier diode D8 of the second rectifier bridge, the cathode of the first rectifier diode D5 of the second rectifier bridge is connected with the anode of the second rectifier diode D6 of the second rectifier bridge, the anode of the first rectifier diode D5 of the second rectifier bridge is connected with the anode of the third rectifier diode D7 of the second rectifier bridge, the cathode of the third rectifier diode D7 of the second rectifier bridge is connected with the anode of the fourth rectifier diode D8 of the second rectifier bridge, the cathode of the second rectifier diode D6 of the second rectifier bridge is connected with the cathode of the fourth rectifier diode D8 of the second rectifier bridge, one end of a filter inductor L2 is connected with the anode of the first rectifier diode D5 of the second rectifier bridge, and the other end of the filter inductor L2 of the online monitoring device is connected with the online monitoring device, the other end of the online monitoring device R is connected with the cathode of a fourth rectifier diode D8 of the second rectifier bridge, the cathode of a first rectifier diode D5 of the second rectifier bridge is connected with the other end of the resonant capacitor C1, and the cathode of a third rectifier diode D7 of the second rectifier bridge is connected with one end of another lead-out wire;
when the power supply circuit for the on-line monitoring device of the alternating-current transmission line supplies power, the other end of one leading-out wire is connected to the three-phase A alternating-current transmission line, the B alternating-current transmission line or the C alternating-current transmission line, the connection point is a first connection point m of the power supply circuit and the power transmission wire, the other end of the other leading-out wire is connected to the three-phase A alternating-current transmission line, the B alternating-current transmission line or the C alternating-current transmission line, the connection point is a second connection point n of the power supply circuit and the power transmission wire, and m and.
In the embodiment, m and n are on conductors of different phases, and the method is suitable for low-voltage/low-current occasions, such as common household power supply lines and the like. In this case, n may also be connected to ground or neutral.
When the phase line is used, one lead-out wire of the first embodiment can extend into the insulating rod, and the head part of the lead-out wire is connected with the conductive hook, so that the insulating rod is held by hand during operation, the conductive hook can be hung on the phase line, and the same is true for the other lead-out wire; in the second embodiment, the two lead-out wires can also be used in the manner of the first embodiment, and the insulating rod can also be omitted. When the full-control type switch is used, the full-control type switch is turned off by adjustment, and is gradually turned on slowly as long as the required power supply voltage is reached; when the voltage is insufficient, the other ends of the two lead-out wires are separated by a sufficient distance.
In the present application, a fully-controlled switch device is a semiconductor device in the field of power electronics, and is a core device for most small electronic products, such as a triode, a MOSFET, etc., and is a core device for a converter station, a thyristor, an IGBT, etc., and the emitter and the collector are only used for distinguishing two access terminals, such as the triode, the emitter and the collector can be used, and the MOSFET can be called a gate and a drain; the control end of the full-control type switch device S is connected with a control part, and for the technical field, the control part for adjusting the on-off and on/off time ratio of the full-control type switch device S is very conveniently purchased in the market, and the power supply can also adopt a dry battery or a button battery and the like for supplying power.
In the application, the first rectifier bridge can be a full bridge or can be assembled by discrete components; the second rectifier bridge can also be a full bridge or can be assembled by discrete components; the flow resistance/pressure resistance value can be purchased according to the requirement; the resonant inductor L1, the resonant capacitor C1 and the filter inductor L2 in the application are all available in the market, and the values can be selected and purchased according to the needs; an on-line monitoring device in this application refers to an apparatus having a power input; in the application, the power components are not numerically nominal, and can be obtained through limited tests according to needs under the conception of the invention and the creation of the application.
The application has the following main advantages:
(1) the circuit has a large adjustable range of output power, and can meet the power requirements of various online monitoring devices of the power transmission line;
(2) the circuit obtains electric energy by depending on the working current on the transmission conductor, so that the circuit can be suitable for the on-line monitoring of any middle position of the transmission line, and the limitation that the traditional on-line monitoring device of the transmission line can only be arranged on a transmission tower is thoroughly eliminated;
(3) the control device of the circuit only needs to use one full-control type switch device, so that the control method is simple and easy to realize.
The invention has the following main beneficial effects: the circuit has simple structure and is easy to manufacture; electricity is convenient to get and the electric power is adjustable; wide application range, convenient use and low cost.
The above-mentioned embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (2)
1. A power supply circuit for an alternating current transmission line on-line monitoring device is provided with a resonant inductor (L1), a resonant capacitor (C1), a first rectifier bridge, a full-control type switch device (S), a second rectifier bridge, a filter inductor (L2), an on-line monitoring device (R) and two lead-out wires; the rectifier is characterized in that the first rectifier bridge is composed of a first rectifier diode (D1), a second rectifier diode (D2), a third rectifier diode (D3) and a fourth rectifier diode (D4), the cathode of the first rectifier diode (D1) is connected with the anode of the second rectifier diode (D2), the anode of the first rectifier diode (D1) is connected with the anode of the third rectifier diode (D3), the cathode of the third rectifier diode (D3) is connected with the anode of the fourth rectifier diode (D4), the cathode of the second rectifier diode (D2) is connected with the cathode of the fourth rectifier diode (D4), and the emitter of the fully-controlled switch (S) is connected with the anode of the first rectifier diode (D1) A collector of the full-control type switching device (S) is connected with a cathode of a fourth rectifying diode (D4) of the first rectifying bridge, a cathode of the first rectifying diode (D1) of the first rectifying bridge is connected with one end of a resonant capacitor (C1) and one end of a resonant inductor (L1), the other end of the resonant inductor (L1) is connected with one end of a lead-out wire, and the other end of the resonant capacitor (C1) is connected with a cathode of a third rectifying diode (D3) of the first rectifying bridge; the second rectifier bridge is composed of a first rectifier diode (D5) of the second rectifier bridge, a second rectifier diode (D6) of the second rectifier bridge, a third rectifier diode (D7) of the second rectifier bridge and a fourth rectifier diode (D8) of the second rectifier bridge, the cathode of the first rectifier diode (D5) of the second rectifier bridge is connected with the anode of the second rectifier diode (D6) of the second rectifier bridge, the anode of the first rectifier diode (D5) of the second rectifier bridge is connected with the anode of the third rectifier diode (D7) of the second rectifier bridge, the cathode of the third rectifier diode (D7) of the second rectifier bridge is connected with the anode of the fourth rectifier diode (D8) of the second rectifier bridge, the cathode of the second rectifier diode (D6) of the second rectifier bridge is connected with the cathode of the fourth rectifier diode (D8) of the second rectifier bridge, one end of an inductor (L2) is connected with the anode of the first rectifier diode (D5) of the second rectifier bridge, the other end of the filter inductor (L2) is connected with one end of an online monitoring device (R), the other end of the online monitoring device (R) is connected with the cathode of a fourth rectifier diode (D8) of the second rectifier bridge, the cathode of a first rectifier diode (D5) of the second rectifier bridge is connected with the other end of the resonant capacitor (C1), and the cathode of a third rectifier diode (D7) of the second rectifier bridge is connected with one end of the other lead-out wire; when the power supply circuit for the alternating current transmission line on-line monitoring device supplies power, the other end of one lead-out wire is connected to an A alternating current transmission line in three phases or a B alternating current transmission line in three phases or a C alternating current transmission line in three phases, the connection point is a first connection point (m) of the power supply circuit and the power transmission wire, the other end of the other lead-out wire is connected to the A alternating current transmission line in three phases or the B alternating current transmission line in three phases or the C alternating current transmission line in three phases, the connection point is a second connection point (n) of the power supply circuit and the power transmission wire, and the first connection point (m) and the second connection point (n) are on the same phase wire.
2. A power supply circuit for an alternating current transmission line on-line monitoring device is provided with a resonant inductor (L1), a resonant capacitor (C1), a first rectifier bridge, a full-control type switch device (S), a second rectifier bridge, a filter inductor (L2), an on-line monitoring device (R) and two lead-out wires; the rectifier is characterized in that the first rectifier bridge is composed of a first rectifier diode (D1), a second rectifier diode (D2), a third rectifier diode (D3) and a fourth rectifier diode (D4), the cathode of the first rectifier diode (D1) is connected with the anode of the second rectifier diode (D2), the anode of the first rectifier diode (D1) is connected with the anode of the third rectifier diode (D3), the cathode of the third rectifier diode (D3) is connected with the anode of the fourth rectifier diode (D4), the cathode of the second rectifier diode (D2) is connected with the cathode of the fourth rectifier diode (D4), and the emitter of the fully-controlled switch (S) is connected with the anode of the first rectifier diode (D1) A collector of the full-control type switching device (S) is connected with a cathode of a fourth rectifying diode (D4) of the first rectifying bridge, a cathode of the first rectifying diode (D1) of the first rectifying bridge is connected with one end of a resonant capacitor (C1) and one end of a resonant inductor (L1), the other end of the resonant inductor (L1) is connected with one end of a lead-out wire, and the other end of the resonant capacitor (C1) is connected with a cathode of a third rectifying diode (D3) of the first rectifying bridge; the second rectifier bridge is composed of a first rectifier diode (D5) of the second rectifier bridge, a second rectifier diode (D6) of the second rectifier bridge, a third rectifier diode (D7) of the second rectifier bridge and a fourth rectifier diode (D8) of the second rectifier bridge, the cathode of the first rectifier diode (D5) of the second rectifier bridge is connected with the anode of the second rectifier diode (D6) of the second rectifier bridge, the anode of the first rectifier diode (D5) of the second rectifier bridge is connected with the anode of the third rectifier diode (D7) of the second rectifier bridge, the cathode of the third rectifier diode (D7) of the second rectifier bridge is connected with the anode of the fourth rectifier diode (D8) of the second rectifier bridge, the cathode of the second rectifier diode (D6) of the second rectifier bridge is connected with the cathode of the fourth rectifier diode (D8) of the second rectifier bridge, one end of an inductor (L2) is connected with the anode of the first rectifier diode (D5) of the second rectifier bridge, the other end of the filter inductor (L2) is connected with one end of an online monitoring device (R), the other end of the online monitoring device (R) is connected with the cathode of a fourth rectifier diode (D8) of the second rectifier bridge, the cathode of a first rectifier diode (D5) of the second rectifier bridge is connected with the other end of the resonant capacitor (C1), and the cathode of a third rectifier diode (D7) of the second rectifier bridge is connected with one end of the other lead-out wire; when the power supply circuit for the alternating current transmission line on-line monitoring device supplies power, the other end of one lead-out wire is connected to an A alternating current transmission line in three phases or a B alternating current transmission line in three phases or a C alternating current transmission line in three phases, the connection point is a first connection point (m) of the power supply circuit and the power transmission wire, the other end of the other lead-out wire is connected to the A alternating current transmission line in three phases or the B alternating current transmission line in three phases or the C alternating current transmission line in three phases, the connection point is a second connection point (n) of the power supply circuit and the power transmission wire, and the first connection point (m) and the second connection point (n) are on different phases of wires.
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| CN109120019A (en) * | 2018-10-15 | 2019-01-01 | 云南电网有限责任公司临沧供电局 | A kind of power transmission line monitoring device electricity getting device |
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| CN101227105A (en) * | 2007-11-26 | 2008-07-23 | 清华大学 | Inductance coupling interval power supply device |
| WO2012021072A1 (en) * | 2010-08-13 | 2012-02-16 | Auckland Uniservices Limited | Inductive power transfer control |
| CN205945545U (en) * | 2016-07-14 | 2017-02-08 | 上海巴玛克电气技术有限公司 | Soft switch low voltage and high current DC power supply of resonant mode |
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