CN201812026U - A cable identifier for detecting cable operation and faults - Google Patents

Abstract

A cable identifier for detecting cable operation and faults belongs to the technical field of electrical circuit detection equipment and instruments. The technical problem to be solved is to provide a cable identifier with simple structure, portability and multiple detection functions. The technical solution is : It consists of a magnetic field sensing probe, a rectifier circuit, an operational amplifier circuit, and a light-emitting circuit. The magnetic field sensing probe, rectifier circuit, operational amplifier circuit, and light-emitting circuit are connected in sequence. The triode is connected with the light emitting diode. The utility model can help construction personnel to accurately and quickly confirm the use of the power cable, and solve the problem that the use of the cable cannot be clearly guided by simple hand touch or eye inspection methods; it can check the fault point when a single-phase or multi-phase short circuit occurs in the cable; It is possible to monitor whether the equipment is running. The utility model has the advantages of simple structure and convenient carrying, and is a good helper for electricians to carry with them.

Description

A cable identifier for detecting cable operation and faults

technical field

The utility model relates to a device for detecting the running state of a cable and whether there is a fault, and belongs to the technical field of electric circuit detection equipment and instruments.

Background technique

Cable is an important carrier for transmitting current. In actual work, identifying cables is a very important content for engineers and electricians. First of all, during the operation of electrical lines, construction personnel need to accurately and quickly confirm the purpose of the power cable; secondly, when one or more short-circuit faults occur in the cable, the fault point of the cable fault must be determined; in addition, the staff must Always monitor the normal operation of the equipment. At present, the existing equipment for detecting cables has a relatively complex structure and a large volume, which is not convenient for electricians to carry around, which affects the real-time detection of cables during construction sites and field operations. Therefore, these tasks often require staff to use Simple hand touch or eye inspection methods make it difficult to achieve satisfactory results in the accuracy and speed of cable detection.

Contents of the invention

The technical problem to be solved by this utility model is to provide a cable identifier with simple structure, portability, and multiple detection functions for detecting cable operation and faults.

The technical scheme that solves the above-mentioned technical problem is:

A cable identifier for detecting cable operation and faults, which consists of a magnetic field sensing probe, a rectifier circuit, an operational amplifier circuit, and a light emitting circuit. The magnetic field sensing probe, rectifier circuit, operational amplifier circuit, and light emitting circuit are connected in sequence, and the operational amplifier circuit Two operational amplifiers are used to connect, and a light-emitting circuit is connected with a triode and a light-emitting diode.

The above-mentioned cable identifier for detecting cable operation and faults, the rectifier circuit is composed of diodes D1, D2, resistor R2, and capacitor C1 to form a half-wave rectifier circuit, the magnetic field sensing probe is connected to the input end of the rectifier circuit, and the output end of the rectifier circuit is connected to the put the circuit.

The above-mentioned cable identifier for detecting cable operation and faults, the operational amplifier is composed of operational amplifiers IC1, IC2, resistors R3-R7, potentiometer W1, capacitor C2, and diode D2, and the non-inverting input terminal of operational amplifier IC1 is connected to the output of the rectifier circuit terminal, the reverse input terminal of the operational amplifier IC1 is connected to the output terminal of the operational amplifier IC1 through the potentiometer W1, the output terminal of the operational amplifier IC1 is connected to the non-inverting input terminal of the operational amplifier IC2 through the diode D2, and the reverse input terminal of the operational amplifier IC2 is connected to the power supply. The output terminal of the operational amplifier IC2 is connected to the light emitting circuit.

The above-mentioned cable identifier for detecting cable operation and faults, the light-emitting circuit is composed of a triode BG1 and a light-emitting diode LED1, the base of the triode BG1 is connected to the output end of the operational amplifier circuit, the light-emitting diode LED1 is connected to the collector of the triode BG1, and the triode BG1 The emitter is grounded.

The utility model can help construction personnel to accurately and quickly confirm the use of the power cable, and solve the problem that the use of the cable cannot be clearly guided by simple hand touch or eye inspection methods; it can check the fault point when a single-phase or multi-phase short circuit occurs in the cable; It is possible to monitor whether the equipment is running. The utility model has the advantages of simple structure and convenient carrying, and is a good helper for electricians to carry with them.

Description of drawings

Fig. 1 is the electrical principle block diagram of the present utility model;

Fig. 2 is the schematic circuit diagram of the utility model.

The markings in the figure are as follows: magnetic field sensing probe 1, rectification circuit 2, operational amplifier circuit 3, light emitting circuit 4.

Detailed ways

As shown in the figure, the utility model is composed of a magnetic field sensing probe 1, a rectifying circuit 2, an amplifying circuit 3, and a light emitting circuit 4.

The rectifier circuit 2 is composed of diodes D1, D2, resistor R2, and capacitor C1 to form a half-wave rectifier circuit. The rectification circuit 2 converts the AC signal induced by the sensor probe 1 into a DC signal, and sends it to the operational amplifier circuit 3 .

The operational amplifier circuit 3 is composed of operational amplifiers IC1, IC2, resistors R3-R7, potentiometer W1, capacitor C2, and diode D2. The non-inverting input terminal of the operational amplifier IC1 is connected to the output terminal of the rectifier circuit 2, the reverse input terminal of the operational amplifier IC1 is connected to the output terminal of the operational amplifier IC1 through the potentiometer W1, and the output terminal of the operational amplifier IC1 is connected to the non-inverting input terminal of the operational amplifier IC2 through the diode D2 , the reverse input terminal of the operational amplifier IC2 is connected to the power supply, and the output terminal of the operational amplifier IC2 is connected to the light emitting circuit 4 . The operational amplifier circuit 3 amplifies the signal input by the rectification circuit 2 and sends it to the light emitting circuit 4 .

The light emitting circuit 4 is composed of a triode BG1 and a light emitting diode LED1. The base of the triode BG1 is connected to the output terminal of the operational amplifier circuit, the light emitting diode LED1 is connected to the collector of the triode BG1, and the emitter of the triode BG1 is grounded. The triode BG1 will obtain the required voltage signal to push the light-emitting diode LED to emit light, indicating whether the magnetic field is present or not.

The model of operational amplifier IC1, IC2 that the embodiment of the utility model shown in the figure adopts is TLC2252 op-amp block, and the model of triode BG1 is C9014.

The using method of the utility model:

1. How to identify cables:

Check the recognizer first. Press and hold the power switch K of the recognizer, and use a small magnetic screwdriver to shake it close to the marked position (sensor position) of the recognizer, and the red light of the LED is on, indicating that the recognizer is working normally and can be used. When using the recognizer, we press the small switch of the recognizer and use the part with the mark of the recognizer to approach the sheath of the cable to be detected. When the red light is on, it means that the cable under test has current passing through it, otherwise no current passes through;

Confirm the cable you are looking for. First of all, let us pass the AC current on the cable to be confirmed as the detection signal (5-10A current for non-armoured cables, about 30A for armored cables), if the load current can meet the above requirements, it is more convenient to use the load current as the signal source. Then apply current to the cables that need to be identified, and repeat the power-off (cut-off) three times. Each time the power-on (current) or power-off (cut-off) is once, the inspector is notified to detect once with the identifier on each cable and record it. Test results. In the detection results, there is only one cable whose number of signal changes detected corresponds to the number of power on and off (current) of the cable we added the signal to, then this cable is the cable we want to confirm;

Second, check the cable fault point method:

First confirm whether the cable is short-circuited to ground or phase-to-phase, and then use a voltage regulator on the side of the short-circuited phase of the cable to boost the voltage of the short-circuited phase or a phase-to-phase to form a current (unarmoured to make the current rise to more than 5A, and armored cables to rise to To 30A or less) as the signal source, use the recognizer to detect along the side where the current is applied to the cable, the signal should be detected within the short-circuit point, the red light of the recognizer is on, and no signal can be detected after a certain point, indicating that there is a signal at the fault point Suddenly there is no signal at a certain point, you can confirm it by trying twice at this point;

3. Whether the monitoring equipment is running:

We fix the cable identifier on the cable that needs to be monitored. The red light is on to indicate that the equipment is running, and the red light is off to indicate that the equipment is not in operation.

Precautions:

1. Because this cable identifier works according to the principle of electromagnetic induction, there must be current as the signal source, otherwise the cable cannot be identified. In order to prevent the interference of large current and strong magnetic field, the tested cable must be separated from other cables during use. A certain distance, the distance is determined by the current of the cables around the site. When detecting, the closer the identifier is to the cable under test, the better, and the farther away from other cables, the smaller the interference;

2. When identifying each cable, identify it at least three times according to the above method. The results of the three tests must match the number of times the cable is powered on and off to ensure accuracy.

Claims (4)

1. the cable identifier of detection streamer operation and fault, it is characterized in that: it is made up of magnetic field sensing probe [1], rectification circuit [2], discharge circuit [3], illuminating circuit [4], magnetic field sensing probe [1], rectification circuit [2], discharge circuit [3], illuminating circuit [4] connect successively, discharge circuit [3] adopts two operational amplifiers to be connected, and illuminating circuit [4] adopts triode to be connected with light emitting diode.

2. the cable identifier of detection streamer operation according to claim 1 and fault, it is characterized in that: described rectification circuit [2] is formed half-wave rectifying circuit by diode D1, D2, resistance R 2, capacitor C 1, magnetic field sensing probe [1] connects the input end of rectification circuit [2], the output termination discharge circuit [3] of rectification circuit [2].

3. the cable identifier of detection streamer operation according to claim 2 and fault, it is characterized in that: described discharge circuit [3] is by operational amplifier IC1, IC2, resistance R 3-R7, potentiometer W1, capacitor C 2, diode D2 forms, operational amplifier IC1 in-phase input end connects the output terminal of rectification circuit [2], operational amplifier IC1 reverse input end is connected on operational amplifier IC1 output terminal by potentiometer W1, the output terminal of operational amplifier IC1 connects the in-phase input end of operational amplifier IC2 by diode D2, the reverse input end of operational amplifier IC2 connects power supply, the output terminal sending and receiving optical circuit [4] of operational amplifier IC2.

4. the cable identifier of detection streamer operation according to claim 3 and fault, it is characterized in that: described illuminating circuit [4] is made up of triode BG1 and LED 1, the base stage of triode BG1 connects the output terminal of discharge circuit [3], LED 1 is connected on the collector of triode BG1, the grounded emitter of triode BG1.

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