CN113036728B - Railway electric power transmission device - Google Patents
Railway electric power transmission device Download PDFInfo
- Publication number
- CN113036728B CN113036728B CN202110283922.8A CN202110283922A CN113036728B CN 113036728 B CN113036728 B CN 113036728B CN 202110283922 A CN202110283922 A CN 202110283922A CN 113036728 B CN113036728 B CN 113036728B
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- capacitor
- circuit
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/15—Indicating the presence of current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a railway power transmission device, which mainly solves the problems of high detection cost and inconvenient sensitivity adjustment of medium and small current signals in the conventional railway power transmission. The device comprises a feeder circuit breaker, a relay protection device, a power transmission line, a power taking coil, a protection circuit, a rectification circuit, a voltage conversion circuit and a power output circuit, wherein the feeder circuit breaker is arranged in a traction substation for railway power supply, the relay protection device and the power transmission line are connected with the feeder circuit breaker, the power taking coil takes power from the power transmission line through a traction network power supply arm, the protection circuit, the rectification circuit, the voltage conversion circuit and the power output circuit are sequentially connected with the power taking coil, and a small current signal generation detection circuit is connected with the protection circuit. Through the design, the power transmission state of the power transmission device is judged through analyzing the small current signal, the power transmission device is ensured to be in a safe working state, and the detection sensitivity of the small current signal generation detection circuit can be conveniently adjusted through the adjustment of the potentiometer. Therefore, the method is suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of railway electric power facilities, in particular to a railway electric power transmission device.
Background
The electrified railway is the first choice of railway construction in the world at present, and the construction mileage of the electrified railway in China is at the top of the world at present. With the development of national economy and the support of western regions, the development of the electrified railway in remote areas such as Qinghai, Tibet, Xinjiang, inner Mongolia and the like is more and more obvious. An important infrastructure of an electrified railway is the power transmission means.
In the electric power transmission, effective safety monitoring and protection of an electric power transmission device are an important guarantee for railway safety operation, the protection principle of the traction network of the electrified railway in China is based on the difference value of load current and short-circuit current, and impedance or overcurrent protection is adopted as traction network protection after the sensitivity is ensured.
However, in the prior art, the detection of very small current signals generated by medium-high voltage and extra-high voltage induction signals in power transmission generally has high cost, a plurality of operational amplifier chips with large amplification factors need to be used, the sensitivity adjustment needs to set an input sensitivity threshold value in a human-computer interface mode, and the small current signals are judged according to the threshold value, so that the use is inconvenient and certain hidden troubles exist.
Disclosure of Invention
The invention aims to provide a railway power transmission device, which mainly solves the problems of high detection cost and inconvenient sensitivity adjustment of small current signals in the conventional railway power transmission.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a railway power transmission device comprises a feeder circuit breaker arranged in a traction substation for railway power supply, a relay protection device and a power transmission line which are connected with the feeder circuit breaker, a power taking coil which takes power from the power transmission line through a traction network power supply arm, a protection circuit, a rectification circuit, a voltage conversion circuit and a power output circuit which are sequentially connected with the power taking coil, and a small current signal generation detection circuit connected with the protection circuit.
Furthermore, the small current signal generation detection circuit comprises a boost conversion circuit, a primary amplification circuit, a secondary amplification circuit, a potential comparison circuit and a clamping voltage stabilizing circuit which are sequentially connected with the protection circuit; the clamping voltage stabilizing circuit is connected with the protection circuit.
Further, the boost converter circuit includes a resistor R1 connected to the output terminal of the protection circuit, resistors R2 and R3 connected to the resistor R1, a resistor R4 having two ends respectively connected to the other end of the resistor R2 and the other end of the resistor R3, a diode D1 having an anode connected to the common terminal of the resistors R2 and R4 and a cathode connected to the common terminal of the resistors R3 and R4 and to ground, a diode D1 having an anode connected to the cathode of the diode D1, a diode D2 having a cathode connected to the anode of the diode D1, a capacitor C1 having one end connected to the cathode of the diode D2 and the other end connected to ground, a resistor R5 connected to the cathode of the diode D2, an operational amplifier a 5 having an inverting input terminal connected to the other end of the resistor R5, a resistor R5 having one end connected to the inverting input terminal of the operational amplifier a 5 and the other end connected to the inverting input terminal of the operational amplifier a 5 after being connected in parallel, and a resistor R5 having the other end connected to ground, A capacitor C3, a capacitor C4 having one end connected to the positive power supply terminal of the operational amplifier a1 and the other end grounded, and a capacitor C5 having one end connected to the negative power supply terminal of the operational amplifier a1 and the other end grounded; the first-stage amplifying circuit is connected with the output end of the operational amplifier A1.
Further, the primary amplifying circuit includes a resistor R8 connected to the output terminal of the operational amplifier a1, a capacitor C6 having two ends respectively connected to the other end of the resistor R8 and the ground terminal of the capacitor C5, a capacitor C7 connected to the common terminal of the resistor R8 and the capacitor C6, a resistor R9 having one end connected to the common terminal of the capacitor C5 and the capacitor C6 and the other end connected to the other end of the capacitor C7, a resistor R10 connected to the common terminal of the resistor R9 and the capacitor C7, an operational amplifier a2 having a non-inverting input terminal connected to the other end of the resistor R10, a resistor R11 having one end connected to the inverting input terminal of the operational amplifier a2 and the other end connected to the ground, a potentiometer RP1 having one end connected to the inverting input terminal of the operational amplifier a2 and the other end connected to the output terminal of the operational amplifier a2, a positive capacitor C8 having one end connected to the source terminal of the operational amplifier a2 and the other end connected to the ground, the capacitor C9 is connected with the negative power supply end of the operational amplifier A2 at one end and grounded at the other end; the second-stage amplifying circuit is connected with the output end of the operational amplifier A2.
Further, the second-stage amplifying circuit includes a resistor R12 connected to the output terminal of the operational amplifier a2, a capacitor C10 connected to the other terminal of the resistor R12, a diode D3 having an anode connected to the other terminal of the capacitor C10, a capacitor C11 having one end connected to the cathode of the diode D3 and the other end grounded, a diode D4 having a cathode connected to the anode of the diode D3 and the cathode connected to the ground terminal of the capacitor C11, a resistor R13 connected in parallel to both ends of the capacitor C11, a resistor R14 connected to the cathode of the diode D3, an operational amplifier A3 having a non-inverting input terminal connected to the other end of the resistor R14, a transient suppression diode TVS1 having one end connected to the inverting input terminal of the operational amplifier A3 and the other end grounded, a potentiometer interface CON1 having A3 rd pin connected to the inverting input terminal of the operational amplifier A3, a resistor R15 having one end connected to the 1 st pin of the potentiometer interface CON1 and the other end grounded, a resistor R16 having one end connected to the 2 nd pin of the potentiometer interface CON1 and the other end connected to the output end of the operational amplifier A3, a capacitor C12 having one end connected to the positive power supply end of the operational amplifier A3 and the other end grounded, and a capacitor C13 having one end connected to the negative power supply end of the operational amplifier A3 and the other end grounded; the potential comparison circuit is connected with the output end of the operational amplifier A3.
Further, the potential comparison circuit comprises a resistor R17 connected with the output end of the operational amplifier A3, an operational amplifier A4 with the inverting input end connected with the other end of the resistor R17, resistors R18 and R19 connected with the non-inverting input end of the operational amplifier A4, resistors R20 and R21 connected with the other end of the resistor R19, a resistor R22 with one end connected with the other end of the resistor R18 and the other end connected with the output end of the operational amplifier A4, a capacitor C14 with one end connected with the positive power supply end of the operational amplifier A4 and the other end grounded, and a capacitor C15 with one end connected with the negative power supply end of the operational amplifier A4 and the other end grounded; the clamping voltage stabilizing circuit is connected with the output end of the operational amplifier A4; the other end of the resistor R20 is connected with 12V voltage, and the other end of the resistor R21 is grounded.
Furthermore, the clamping voltage stabilizing circuit is composed of a clamping resistor R23 and a voltage stabilizing diode D5; one end of the clamping resistor R23 is connected with the common end of the resistor R22 and the resistor R18, the cathode of the voltage stabilizing diode D5 is connected with the other end of the clamping resistor R23, and the anode of the voltage stabilizing diode D5 is grounded; the common end of the voltage stabilizing diode D5 and the clamping resistor R23 is connected with the protection circuit.
Further, the protection circuit comprises a controller and a reset fuse PTC, wherein one end of the reset fuse PTC is connected with the controller, and the other end of the reset fuse PTC is connected with the power-taking coil; the resistor R1 of the boost conversion circuit is connected with the controller.
Further, the rectifier circuit includes a rectifier bridge B1 connected to the output port of the controller, a capacitor C16 having an anode connected to the 1 st end of the rectifier bridge B1 and a cathode connected to the 3 rd end of the rectifier bridge B1, and a capacitor C17 having a cathode connected to the 2 nd end of the rectifier bridge B1 and an anode connected to the 4 th end of the rectifier bridge B1.
Further, the power output circuit comprises a capacitor C18, an inductor L1, resistors R24 and R25 and a diode D6 which are connected with the voltage conversion circuit, an electronic switching tube Q1 with a gate connected with the other end of the resistor R24, an electronic switching tube Q2 with a gate connected with the other end of the resistor R25, a diode D7 connected with the other end of the inductor L1, and a capacitor C19; the source of the electronic switch tube Q1 is connected to the drain of the electronic switch tube Q2, the source of the electronic switch tube Q2 is grounded, the drain of the electronic switch tube Q1 is grounded, and one end of the cathode of the diode D7 is used as an output end.
Compared with the prior art, the invention has the following beneficial effects:
(1) the protection circuit is arranged, the small current generated by the high voltage electricity in the railway power transmission process is detected by the small current signal generation detection circuit connected with the protection circuit, and the power transmission state of the power transmission device is judged by analyzing the small current signal, so that the power transmission device is ensured to be in a safe working state.
(2) The small current signal generation detection circuit has low cost, only adopts a conventional operational amplifier, can save a large amount of cost, has quick circuit response, does not need AD acquisition and CPU operation processing, can output a level signal reflecting whether the small current signal exists or not by comparing analog signals, has no time delay and a response speed block, can detect whether the small current signal is generated or not by an external controller only by detecting the level, and can conveniently adjust the detection sensitivity of the small current signal generation detection circuit by adjusting a potentiometer.
Drawings
Fig. 1 is a schematic diagram of the overall circuit structure of the present invention.
Wherein, the names corresponding to the reference numbers are:
the power supply circuit comprises a feeder circuit breaker 1, a relay protection device 2, a power transmission line 3, a power taking coil 4, a protection circuit 5, a rectification circuit 6, a voltage conversion circuit 7, a power output circuit 8, a boost conversion circuit 9, a primary amplification circuit 10, a secondary amplification circuit 11, a potential comparison circuit 12 and a clamping voltage stabilizing circuit 13.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1, the railway power transmission device disclosed by the invention comprises a feeder circuit breaker 1 arranged in a traction substation for railway power supply, a relay protection device 2 and a power transmission line 3 connected with the feeder circuit breaker 1, a power taking coil 4 for taking power from the power transmission line through a traction network power supply arm, a protection circuit 5, a rectification circuit 6, a voltage conversion circuit 7 and a power output circuit 8 which are sequentially connected with the power taking coil 4, and a small current signal generation detection circuit connected with the protection circuit 5. When the electric locomotive is powered, the power transmission line obtains power from the traction substation and supplies power, and the output end of the traction substation is protected through the feeder circuit breaker and the relay protection device. The electric power transmitted by the power transmission line is output to an electric locomotive for use after being rectified, converted and the like through a traction network power supply arm and a power taking coil. At the power supply output end of the power transmission line, induced current generated by high voltage is detected by arranging a protection circuit and a small current signal generation detection circuit, so that the power supply condition of the power transmission device can be detected in real time, and the stability and the safety of power supply are guaranteed.
In this embodiment, the small current signal generation detection circuit includes a boost converter circuit 9, a first-stage amplifier circuit 10, a second-stage amplifier circuit 11, a potential comparison circuit 12, and a clamp voltage regulator circuit 13, which are sequentially connected to the protection circuit 5; the clamping voltage stabilizing circuit 13 is connected with the protection circuit 5. The small current signal firstly passes through the boost conversion circuit to convert the current signal into a small voltage signal. The small voltage signal is subjected to primary amplification on the signal through a primary amplification circuit, then is subjected to secondary amplification through a secondary amplification circuit, and the amplified voltage signal passes through a potential comparison circuit and a clamping voltage stabilizing circuit and finally outputs signals of 0 and 1 which accord with a controller in a protection circuit.
Specifically, the boost converter circuit includes a resistor R1 connected to the output terminal of the protection circuit, resistors R2 and R3 connected to the resistor R1, a resistor R4 having two ends connected to the other end of the resistor R2 and the other end of the resistor R3, a diode D1 having an anode connected to the common terminal of the resistors R2 and R4 and a cathode connected to the common terminal of the resistors R3 and R4 and to the ground, a diode D2 having an anode connected to the cathode of the diode D1 and a cathode connected to the anode of the diode D1, a capacitor C1 having one end connected to the cathode of the diode D2 and the other end connected to the ground, a resistor R5 connected to the cathode of the diode D2, an operational amplifier a1 having an inverting input connected to the other end of the resistor R5, a resistor R6 having one end connected to the inverting input terminal of the operational amplifier a1 and the other end connected to the output terminal of the operational amplifier a1 after parallel connection, a capacitor C2, a resistor R7 having one end connected to the inverting input terminal of the operational amplifier a parallel connection to the operational amplifier a positive input terminal of the operational 1 and the other end connected to the resistor R7 and the other end connected to the ground, A capacitor C3, a capacitor C4 having one end connected to the positive power supply terminal of the operational amplifier a1 and the other end grounded, and a capacitor C5 having one end connected to the negative power supply terminal of the operational amplifier a1 and the other end grounded; the first-stage amplifying circuit is connected with the output end of the operational amplifier A1. The circuit is used for converting a small current signal into a small voltage signal and simultaneously inverting the phase.
In this embodiment, the primary amplifying circuit includes a resistor R8 connected to the output terminal of the operational amplifier a1, a capacitor C6 having two ends respectively connected to the other end of the resistor R8 and the ground terminal of the capacitor C5, a capacitor C7 connected to the common terminal of the resistor R8 and the capacitor C6, a resistor R9 having one end connected to the common terminal of the capacitor C5 and the capacitor C6 and the other end connected to the other end of the capacitor C7, a resistor R10 connected to the common terminal of the resistor R9 and the capacitor C7, an operational amplifier a2 having a non-inverting input terminal connected to the other end of the resistor R10, a resistor R11 having one end connected to the inverting input terminal of the operational amplifier a2 and the other end connected to the ground, a potentiometer RP1 having one end connected to the inverting input terminal of the operational amplifier a2 and the other end connected to the output terminal of the operational amplifier a2, a capacitor C8 having one end connected to the source terminal of the operational amplifier a2 and the other end connected to the ground, the capacitor C9 is connected with the negative power supply end of the operational amplifier A2 at one end and grounded at the other end; the second-stage amplifying circuit is connected with the output end of the operational amplifier A2. When the potentiometer RP1 is adjusted to be large, the amplification factor of the first-stage amplification circuit also becomes large, and the output voltage also becomes large. The coarse adjustment of the signal sensitivity can be realized by adjusting the small current adjustment of the potentiometer RP 1.
In this embodiment, the second-stage amplifying circuit includes a resistor R12 connected to the output terminal of the operational amplifier a2, a capacitor C10 connected to the other terminal of the resistor R12, a diode D3 having an anode connected to the other terminal of the capacitor C10, a capacitor C11 having one terminal connected to the cathode of the diode D3 and the other terminal grounded, a diode D4 having a cathode connected to the anode of the diode D3 and the cathode connected to the ground terminal of the capacitor C11, a resistor R13 connected in parallel to both ends of the capacitor C11, a resistor R14 connected to the cathode of the diode D3, an operational amplifier A3 having a non-inverting input terminal connected to the other terminal of the resistor R14, a transient suppression diode TVS1 having one terminal connected to the inverting input terminal of the operational amplifier A3 and the other terminal grounded, a potentiometer interface CON1 having A3 rd pin connected to the inverting input terminal of the operational amplifier A3, a resistor R15 having one terminal connected to the 1 st pin of the potentiometer interface CON1 and the other terminal grounded, a resistor R16 having one end connected to the 2 nd pin of the potentiometer interface CON1 and the other end connected to the output end of the operational amplifier A3, a capacitor C12 having one end connected to the positive power supply end of the operational amplifier A3 and the other end grounded, and a capacitor C13 having one end connected to the negative power supply end of the operational amplifier A3 and the other end grounded; the potential comparison circuit is connected with the output end of the operational amplifier A3. When the resistor connected to the potentiometer interface CON1 is increased, the amplification factor of the second-stage amplification circuit is also increased, and the output voltage is also increased. And the adjustment of the potentiometer is adjusted to realize fine adjustment of the signal sensitivity.
In this embodiment, the potential comparison circuit includes a resistor R17 connected to the output terminal of the operational amplifier A3, an operational amplifier a4 having an inverting input terminal connected to the other terminal of the resistor R17, resistors R18 and R19 connected to the non-inverting input terminal of the operational amplifier a4, resistors R20 and R21 connected to the other terminal of the resistor R19, a resistor R22 having one end connected to the other terminal of the resistor R18 and the other terminal connected to the output terminal of the operational amplifier a4, a capacitor C14 having one end connected to the positive power supply terminal of the operational amplifier a4 and the other terminal connected to ground, and a capacitor C15 having one end connected to the negative power supply terminal of the operational amplifier a4 and the other terminal connected to ground; the clamping voltage stabilizing circuit is connected with the output end of the operational amplifier A4; the other end of the resistor R20 is connected with 12V voltage, and the other end of the resistor R21 is grounded.
In this embodiment, the clamping voltage stabilizing circuit is composed of a clamping resistor R23 and a zener diode D5; one end of the clamping resistor R23 is connected with the common end of the resistor R22 and the resistor R18, the cathode of the voltage stabilizing diode D5 is connected with the other end of the clamping resistor R23, and the anode of the voltage stabilizing diode D5 is grounded; the common end of the voltage stabilizing diode D5 and the clamping resistor R23 is connected with the protection circuit.
In this embodiment, the protection circuit includes a controller and a reset fuse PTC, one end of which is connected to the controller and the other end of which is connected to the power-taking coil; the resistor R1 of the boost conversion circuit is connected with the controller; the voltage conversion circuit adopts an XL7015 buck type direct current conversion chip. The protection circuit mainly receives a threshold alarm sent by a small current signal generation detection signal, and starts a protection mechanism of the power transmission device when the induced current of the whole power transmission line exceeds the threshold.
In this embodiment, the rectifier circuit includes a rectifier bridge B1 connected to the output port of the controller, a capacitor C16 having an anode connected to the 1 st terminal of the rectifier bridge B1 and a cathode connected to the 3 rd terminal of the rectifier bridge B1, and a capacitor C17 having a cathode connected to the 2 nd terminal of the rectifier bridge B1 and an anode connected to the 4 th terminal of the rectifier bridge B1.
In this embodiment, the power output circuit includes a capacitor C18, an inductor L1, resistors R24, R25 and a diode D6 connected to the voltage conversion circuit, an electronic switching tube Q1 whose gate is connected to the other end of the resistor R24, an electronic switching tube Q2 whose gate is connected to the other end of the resistor R25, and a diode D7 and a capacitor C19 connected to the other end of the inductor L1; the source of the electronic switch tube Q1 is connected to the drain of the electronic switch tube Q2, the source of the electronic switch tube Q2 is grounded, the drain of the electronic switch tube Q1 is grounded, and one end of the cathode of the diode D7 is used as an output end. The circuit controls the on-off of the switch tube through the voltage conversion chip to ensure the stable power output of the device in the power transmission process.
Through the design, the protection circuit is arranged, the small current generated by the high voltage electricity in the railway power transmission process is detected by the small current signal generation detection circuit connected with the protection circuit, the power transmission state of the power transmission device is judged through analyzing the small current signal, the power transmission device is ensured to be in a safe working state, and the detection sensitivity of the small current signal generation detection circuit can be conveniently adjusted through the adjustment of the potentiometer. Therefore, the method is suitable for popularization and application.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (4)
1. A railway power transmission device is characterized by comprising a feeder circuit breaker (1) arranged in a traction substation for railway power supply, a relay protection device (2) and a power transmission line (3) which are connected with the feeder circuit breaker (1), a power taking coil (4) which takes power from the power transmission line through a traction network power supply arm, a protection circuit (5), a rectifying circuit (6), a voltage conversion circuit (7) and a power output circuit (8) which are sequentially connected with the power taking coil (4), and a small current signal generation detection circuit connected with the protection circuit (5);
the small current signal generation detection circuit comprises a boost conversion circuit (9), a primary amplification circuit (10), a secondary amplification circuit (11), a potential comparison circuit (12) and a clamping voltage stabilizing circuit (13) which are sequentially connected with a protection circuit (5); the clamping voltage stabilizing circuit (13) is connected with the protection circuit (5);
the boost conversion circuit comprises a resistor R1 connected with the output end of the protection circuit, resistors R2 and R3 connected with a resistor R1, a resistor R4 with two ends respectively connected with the other end of a resistor R2 and the other end of a resistor R3, a diode D1 with the anode connected with the common end of the resistors R2 and R4 and the cathode connected with the common end of the resistors R3 and R4 and the ground, a diode D2 with the anode connected with the cathode of the diode D1 and the cathode connected with the anode of the diode D1, a capacitor C1 with one end connected with the cathode of the diode D2 and the other end connected with the ground, a resistor R5 connected with the cathode of the diode D2, an operational amplifier A1 with the inverting input end connected with the other end of the resistor R5, a resistor R6 with one end connected with the inverting input end of the operational amplifier A1 and the other end connected with the output end of the operational amplifier A1 and a capacitor C2, and a resistor R59 7 with the inverting input end of the operational amplifier A1 and the other end connected with the ground after being connected with the input end of the operational amplifier, A capacitor C3, a capacitor C4 having one end connected to the positive power supply terminal of the operational amplifier a1 and the other end grounded, and a capacitor C5 having one end connected to the negative power supply terminal of the operational amplifier a1 and the other end grounded; the first-stage amplifying circuit is connected with the output end of the operational amplifier A1;
the first-stage amplifying circuit comprises a resistor R8 connected with the output end of the operational amplifier A1, a capacitor C6 with two ends correspondingly connected with the other end of the resistor R8 and the grounding end of the capacitor C5 respectively, a capacitor C7 connected with the common end of the resistor R8 and the capacitor C6, a resistor R9 with one end connected with the common end of the capacitor C5 and the capacitor C6 and the other end connected with the other end of the capacitor C7, a resistor R10 connected to a common terminal of the resistor R9 and the capacitor C7, an operational amplifier A2 having a non-inverting input terminal connected to the other terminal of the resistor R10, a resistor R11 having one terminal connected to an inverting input terminal of the operational amplifier A2 and the other terminal connected to the ground, a potentiometer RP1 having one terminal connected to an inverting input terminal of the operational amplifier A2 and a sliding terminal and the other terminal connected to an output terminal of the operational amplifier A2, a capacitor C8 having one terminal connected to a positive power source terminal of the operational amplifier A2 and the other terminal connected to the ground, the capacitor C9 is connected with the negative power supply end of the operational amplifier A2 at one end and grounded at the other end; the second-stage amplifying circuit is connected with the output end of the operational amplifier A2;
the second-stage amplifying circuit comprises a resistor R12 connected with the output end of the operational amplifier A2, a capacitor C10 connected with the other end of the resistor R12, a diode D3 with the anode connected with the other end of the capacitor C10, a capacitor C11 with one end connected with the cathode of the diode D3 and the other end grounded, a diode D4 with the cathode connected with the anode of the diode D3 and the cathode connected with the ground end of the capacitor C11, a resistor R13 connected in parallel with two ends of the capacitor C11, a resistor R14 connected with the cathode of the diode D3, an operational amplifier A3 with the normal-phase input end connected with the other end of the resistor R14, a transient suppression diode TVS1 with one end connected with the inverting input end of the operational amplifier A3 and the other end grounded, a potentiometer interface CON1 with the 3 rd pin connected with the inverting input end of the operational amplifier A3, a resistor R1 with one end connected with the 1 st pin of the potentiometer interface CON 4 and the other end grounded, a resistor R1 with the other end connected with the second pin of the potentiometer interface CON1, and the other end connected with the output end of the operational amplifier A1 of the potentiometer interface CON1 A capacitor C12 having one end connected to the positive power supply terminal of the operational amplifier A3 and the other end grounded, and a capacitor C13 having one end connected to the negative power supply terminal of the operational amplifier A3 and the other end grounded; the potential comparison circuit is connected with the output end of the operational amplifier A3;
the potential comparison circuit comprises a resistor R17 connected with the output end of an operational amplifier A3, an operational amplifier A4 with the inverting input end connected with the other end of a resistor R17, resistors R18 and R19 connected with the non-inverting input end of the operational amplifier A4, resistors R20 and R21 connected with the other end of the resistor R19, a resistor R22 with one end connected with the other end of the resistor R18 and the other end connected with the output end of the operational amplifier A4, a capacitor C14 with one end connected with the positive power supply end of the operational amplifier A4 and the other end grounded, and a capacitor C15 with one end connected with the negative power supply end of the operational amplifier A4 and the other end grounded; the clamping voltage stabilizing circuit is connected with the output end of the operational amplifier A4; the other end of the resistor R20 is connected with 12V voltage, and the other end of the resistor R21 is grounded;
the clamping voltage stabilizing circuit is composed of a clamping resistor R23 and a voltage stabilizing diode D5; one end of the clamping resistor R23 is connected with the common end of the resistor R22 and the resistor R18, the cathode of the voltage stabilizing diode D5 is connected with the other end of the clamping resistor R23, and the anode of the voltage stabilizing diode D5 is grounded; the common end of the voltage stabilizing diode D5 and the clamping resistor R23 is connected with the protection circuit.
2. A railway power transmission apparatus according to claim 1, wherein the protection circuit comprises a controller, and a reset fuse PTC connected to the controller at one end and to the power-taking coil at the other end; the resistor R1 of the boost conversion circuit is connected with the controller.
3. The railway power transmission device of claim 2, wherein the rectifier circuit comprises a rectifier bridge B1 connected to the output port of the controller, a capacitor C16 having a positive terminal connected to the 1 st terminal of the rectifier bridge B1 and a negative terminal connected to the 3 rd terminal of the rectifier bridge B1, and a capacitor C17 having a negative terminal connected to the 2 nd terminal of the rectifier bridge B1 and a positive terminal connected to the 4 th terminal of the rectifier bridge B1.
4. The railway power transmission device of claim 3, wherein the power output circuit comprises a capacitor C18, an inductor L1, resistors R24, R25 and a diode D6 which are connected with the voltage conversion circuit, an electronic switching tube Q1 with a grid connected with the other end of the resistor R24, an electronic switching tube Q2 with a grid connected with the other end of the resistor R25, a diode D7 and a capacitor C19 which are connected with the other end of the inductor L1; the source of the electronic switch tube Q1 is connected to the drain of the electronic switch tube Q2, the source of the electronic switch tube Q2 is grounded, the drain of the electronic switch tube Q1 is grounded, and one end of the cathode of the diode D7 is used as an output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283922.8A CN113036728B (en) | 2021-03-17 | 2021-03-17 | Railway electric power transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283922.8A CN113036728B (en) | 2021-03-17 | 2021-03-17 | Railway electric power transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113036728A CN113036728A (en) | 2021-06-25 |
| CN113036728B true CN113036728B (en) | 2022-07-12 |
Family
ID=76471223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110283922.8A Active CN113036728B (en) | 2021-03-17 | 2021-03-17 | Railway electric power transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036728B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203592908U (en) * | 2013-11-18 | 2014-05-14 | 中铁第一勘察设计院集团有限公司 | Direct current-alternating current traction power supply system |
| CN104184111A (en) * | 2014-09-02 | 2014-12-03 | 四川汇源光通信有限公司 | Overvoltage protection circuit for high-voltage transmission line ground wire power getting |
| CN205022384U (en) * | 2014-10-09 | 2016-02-10 | 庞巴迪运输有限公司 | Response power transfer system |
| CN105720833A (en) * | 2016-03-24 | 2016-06-29 | 西安爱科赛博电气股份有限公司 | Railway traction power-obtaining power supply for through line |
| CN109256764A (en) * | 2018-11-23 | 2019-01-22 | 西南交通大学 | A kind of vehicle-mounted grid-side converter suitable for middle pressure direct-current traction power supply |
| CN109428331A (en) * | 2017-08-24 | 2019-03-05 | 株洲中车时代电气股份有限公司 | A kind of traction substation comprehensive energy device and its control method |
| CN111697598A (en) * | 2020-05-19 | 2020-09-22 | 国网湖南省电力有限公司 | Mode switching system and mode switching method for electrified railway |
| CN112398103A (en) * | 2020-11-25 | 2021-02-23 | 南京南瑞继保电气有限公司 | Protection method and device of direct current traction power supply system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222984B (en) * | 2011-06-09 | 2012-08-22 | 山东鲁亿通智能电气股份有限公司 | On-line monitoring inductive electricity-taking device for intelligent switchgear |
| US9368961B2 (en) * | 2013-01-08 | 2016-06-14 | Power Integrations, Inc. | Overvoltage protection circuit |
-
2021
- 2021-03-17 CN CN202110283922.8A patent/CN113036728B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203592908U (en) * | 2013-11-18 | 2014-05-14 | 中铁第一勘察设计院集团有限公司 | Direct current-alternating current traction power supply system |
| CN104184111A (en) * | 2014-09-02 | 2014-12-03 | 四川汇源光通信有限公司 | Overvoltage protection circuit for high-voltage transmission line ground wire power getting |
| CN205022384U (en) * | 2014-10-09 | 2016-02-10 | 庞巴迪运输有限公司 | Response power transfer system |
| CN105720833A (en) * | 2016-03-24 | 2016-06-29 | 西安爱科赛博电气股份有限公司 | Railway traction power-obtaining power supply for through line |
| CN109428331A (en) * | 2017-08-24 | 2019-03-05 | 株洲中车时代电气股份有限公司 | A kind of traction substation comprehensive energy device and its control method |
| CN109256764A (en) * | 2018-11-23 | 2019-01-22 | 西南交通大学 | A kind of vehicle-mounted grid-side converter suitable for middle pressure direct-current traction power supply |
| CN111697598A (en) * | 2020-05-19 | 2020-09-22 | 国网湖南省电力有限公司 | Mode switching system and mode switching method for electrified railway |
| CN112398103A (en) * | 2020-11-25 | 2021-02-23 | 南京南瑞继保电气有限公司 | Protection method and device of direct current traction power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113036728A (en) | 2021-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207354054U (en) | The electric power system of online power equipment monitoring system | |
| CN101021719A (en) | Electrical measurement-based control switch and switch control socket | |
| CN101051743B (en) | Over-temperature protection circuit for transformer in reverse exciting topological power | |
| CN113036728B (en) | Railway electric power transmission device | |
| CN201307764Y (en) | Power supply circuit with overvoltage protection function | |
| CN2453568Y (en) | Electric power supply plug for preventing it from being leakage, over-voltage, over-load, short circuit and lightninhg-stroke | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN201562951U (en) | Fault arc protection device | |
| CN214314521U (en) | Device capable of effectively reducing misoperation of leakage protector | |
| CN204992525U (en) | Undervoltage protection circuit of delaying of switch electrical apparatus | |
| CN209250217U (en) | Voltage of power overload protection arrangement | |
| CN211505803U (en) | Low-voltage load fault detection device | |
| CN221351649U (en) | Intelligent fault early warning system | |
| CN205958636U (en) | Put small -size circuit voltage acquisition device of cabinet in distributed generator circuit | |
| CN105958589B (en) | Emergency power supply charger | |
| CN205484518U (en) | Arc voltage signal detection circuit of block terminal | |
| CN215646154U (en) | Plug-in box with built-in isolating switch | |
| CN209471166U (en) | A kind of the self-energizing circuit and its current sampling circuit of current transformer | |
| CN204992520U (en) | Resume power supply protection device | |
| CN220775369U (en) | Alternating current instantaneous sampling and overcurrent short-circuit protection circuit | |
| CN221426843U (en) | Ring main unit fault pre-diagnosis monitoring circuit | |
| CN218124397U (en) | Solid state controller in circuit breaker | |
| CN221227126U (en) | Phase-to-earth fault monitoring and protecting equipment | |
| CN212780968U (en) | Generator excitation current acquisition module | |
| CN219574233U (en) | Non-invasive load data acquisition system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |