CN213903695U

CN213903695U - Cable fault detection positioning device

Info

Publication number: CN213903695U
Application number: CN202022686542.2U
Authority: CN
Inventors: 刁琢; 刁青海; 王戈
Original assignee: Kaifeng Odi Power Equipment Engineering Co ltd
Current assignee: Kaifeng Odi Power Equipment Engineering Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-08-06
Anticipated expiration: 2030-11-19

Abstract

The utility model discloses a cable fault detection positioning device, which comprises a detection isolation circuit and a rapid amplification processing circuit, wherein the detection isolation circuit comprises a current sensor for detecting fault points, and a voltage follower is adopted to isolate and amplify current detection signals, so that the detection process forms electrical isolation, and the safety performance of the device is effectively improved; the rapid amplification processing circuit utilizes the combination triode amplification principle to carry out rapid amplification to the detected signal, has promoted the measuring response speed of device well, send to the controller after RC filtering at last, when meetting the fault point in the measurement process, the controller can the rapid judgement out existence of trouble to control warning subassembly carries out acousto-optic warning work, then make accurate positioning to the fault point, measure the simple operation, the security is high, fault location degree of accuracy is high, has fine result of use.

Description

Cable fault detection positioning device

Technical Field

The utility model relates to a cable fault detects technical field, especially relates to a cable fault detects positioner.

Background

With the gradual increase of the demand of metal smelting industry, machinery manufacturing industry and mining industry on electricity consumption in the rapid economic development, the power cable transmission with the increasing demand of the power cable has the advantages of small occupied area, space saving, small maintenance workload and contribution to the improvement of power factors and wide application in various fields. Therefore, after the power cable fails, how to quickly and accurately judge and find the fault point provides new requirements for cable maintenance work, and the problem becomes more and more important for the power supply department. The existing cable fault detection positioning device has limitations on operation safety and convenience in the environment facing a high-voltage electric field.

So the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

To the above situation, in order to overcome the defects of the prior art, the present invention is directed to a cable fault detection positioning device.

The technical scheme for solving the problem is that the cable fault detection positioning device comprises a detection isolation circuit and a rapid amplification processing circuit, wherein the detection isolation circuit comprises a current sensor for detecting a fault point, the signal output end of the current sensor is connected with the non-inverting input end of an operational amplifier AR1 and is grounded through a resistor R1, and the inverting input end and the output end of the operational amplifier AR1 are connected with the rapid amplification processing circuit through a diode D1; the rapid amplification processing circuit comprises a combined amplification tube and a controller, wherein the input end of the combined amplification tube is connected with the output end of the detection isolation circuit, the output end of the combined amplification tube is connected with the controller, and the controller is used for controlling the work of the alarm assembly.

Preferably, the combined amplifier tube comprises transistors VT1, VT2, a base of the transistor VT1 is connected to one end of resistors R2, R4, a capacitor C1, a collector of the transistor VT2 and an output end of the detection isolation circuit through a resistor R3, the other ends of the resistor R2 and the capacitor C1 are grounded in parallel with an emitter of the transistor VT1, a base of the transistor VR2 is connected to the other end of the resistor R4 and a cathode of the zener diode DZ1, an anode of the zener diode DZ1 is grounded, an emitter of the transistor VT2 is connected to the collector of the transistor VT1, one end of the capacitor C2 and the controller are connected through a resistor R5, and the other end of the capacitor C2 is grounded.

Preferably, the alarm component comprises a buzzer and an LED warning lamp.

Through the technical scheme, the beneficial effects of the utility model are that:

1. the detection isolation circuit adopts the voltage follower to carry out isolation amplification on the current detection signal, so that electrical isolation is formed in the detection process, and the safety performance of the device is effectively improved;

2. the rapid amplification processing circuit utilizes the combination triode amplification principle to carry out rapid amplification to the detected signal, has promoted the measuring response speed of device well, send to the controller after RC filtering at last, when meetting the fault point in the measurement process, the controller can the rapid judgement out existence of trouble to control warning subassembly carries out acousto-optic warning work, then make accurate positioning to the fault point, measure the simple operation, the security is high, fault location degree of accuracy is high, has fine result of use.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Cable fault detection positioner, including detecting isolation circuit and quick amplification processing circuit, detect isolation circuit and include the current sensor who is used for detecting the fault point, current sensor's signal output part connects fortune and puts the homophase input of ware AR1 to through resistance R1 ground connection, fortune puts reverse phase input, the output of ware AR1 and passes through diode D1 and connect quick amplification processing circuit. The rapid amplification processing circuit comprises a combined amplification tube and a controller, wherein the input end of the combined amplification tube is connected with the output end of the detection isolation circuit, the output end of the combined amplification tube is connected with the controller, and the controller is used for controlling the work of the alarm assembly. When the alarm device is specifically arranged, the alarm assembly comprises a buzzer and an LED warning lamp, and the power supply ends of the buzzer and the LED warning lamp are connected with the output end of the controller.

The combined amplifying tube comprises triodes VT1 and VT2, the base electrode of a triode VT1 is connected with one end of a resistor R2 and R4 and a capacitor C1 through a resistor R3, the collector electrode of the triode VT2 and the output end of the detection isolating circuit, the other ends of the resistor R2 and the capacitor C1 are grounded in parallel with the emitter electrode of the triode VT1, the base electrode of a triode VR2 is connected with the other end of the resistor R4 and the cathode of a zener diode DZ1, the anode of the zener diode DZ1 is grounded, the emitter electrode of a triode VT2 is connected with the collector electrode of the triode VT1, one end of a capacitor C2 and the controller are connected through a resistor R5, and the other end of a capacitor C2 is.

The utility model discloses when specifically using, at first carry out the pulse pressurization to the cable that awaits measuring, then carry out the current induction through current sensor to the cable and detect. In order to guarantee the safety of detection, the detection isolation circuit adopts the operational amplifier AR1 to isolate and amplify the current detection signal, thereby forming electrical isolation in the detection process and effectively improving the safety performance of the device. The fast amplification processing circuit adopts the capacitor C1 to buffer and filter the output signal of the operational amplifier AR1, and applies the combined triode amplification principle to fast amplify the detection signal, thereby well improving the response speed of the device measurement, and finally, the detection signal is sent to the controller after being filtered by the RC. When a fault point is encountered in the measuring process, the applied pulse voltage can generate a reflected wave, the reflected wave signal can be monitored by the current sensor, so that the controller can monitor the reflected wave when the fault point occurs, the existence of the fault is judged, the alarm component is controlled to perform sound-light alarm work, and then the fault point is accurately positioned. The utility model discloses measure the simple operation, the security is high, and the fault location degree of accuracy is high, has fine result of use.

The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.

Claims

1. Cable fault detection positioner, including detecting buffer circuit and quick amplifier processing circuit, its characterized in that: the detection isolation circuit comprises a current sensor for detecting a fault point, a signal output end of the current sensor is connected with a non-inverting input end of an operational amplifier AR1 and is grounded through a resistor R1, and an inverting input end and an output end of an operational amplifier AR1 are connected with the rapid amplification processing circuit through a diode D1; the rapid amplification processing circuit comprises a combined amplification tube and a controller, wherein the input end of the combined amplification tube is connected with the output end of the detection isolation circuit, the output end of the combined amplification tube is connected with the controller, and the controller is used for controlling the work of the alarm assembly.

2. The cable fault detection and location device of claim 1, wherein: the combined amplifier tube comprises triodes VT1 and VT2, the base electrode of a triode VT1 is connected with one end of a resistor R2 and R4 and a capacitor C1 through a resistor R3, the collector electrode of the triode VT2 and the output end of the detection isolation circuit, the other ends of the resistor R2 and the capacitor C1 are grounded in parallel with the emitter electrode of the triode VT1, the base electrode of a triode VR2 is connected with the other end of the resistor R4 and the cathode of a zener diode DZ1, the anode of the zener diode DZ1 is grounded, the emitter electrode of a triode VT2 is connected with the collector electrode of the triode VT1, one end of a capacitor C2 and the controller are connected through a resistor R5, and the other end of a capacitor C2 is grounded.

3. The cable fault detection and location device of claim 2, wherein: the alarm assembly comprises a buzzer and an LED warning lamp.