CN207557400U - A kind of low voltage failure circuit investigates instrument - Google Patents

Abstract

The utility model discloses a kind of low voltage failure circuits to investigate instrument, is related to low-voltage circuit fault detection technique field.The low voltage failure circuit investigates instrument, including power circuit, signal output apparatus, Special wiring device, control management circuit, export indicating circuit, electric-leakage detection circuit and short-circuit detecting circuit, discontinuous is generated by signal output apparatus and detects signal, the detection signal is input to by Special wiring device on circuit to be measured, the leakage current and short circuit current of signal output apparatus are detected by electric-leakage detection circuit and short-circuit detecting circuit simultaneously, feed back to control management circuit, it is shown on output indicating circuit after control management circuit analysis calculates, judge the circuit to be measured with the presence or absence of electric leakage and short circuit phenomenon, line fault investigation can be identified rapidly, and restore independent trouble shooting circuit again after non-fault line power supply, improve the investigation efficiency of faulty line, shorten the power failure stand-by period of non-fault line.

Description

A low-voltage fault line troubleshooting instrument

technical field

The utility model belongs to the technical field of low-voltage line fault detection, in particular to a line fault checking and identification instrument with a rated voltage level of 220V/380V.

Background technique

Lines with a rated voltage of 220V/380V are widely used in my country's power supply system. Due to line aging, overload, irregular construction, external forces, etc., the line short circuit, leakage or line terminal short circuit, leakage, etc. cause power transmission failure. Occurs from time to time, where there is no leakage isolation switch, there is often a problem with one line that affects other users who have multiple parallel lines and cannot use electricity.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a low-voltage faulty line troubleshooting instrument, which is used to solve the problem of quickly restoring the power supply of non-faulty lines at the scene of a sudden power outage, that is, to quickly check, identify and isolate the faulty lines, and restore the non-faulty lines first. After the line is powered on, check and repair the fault separately, reducing the waiting time for non-faulty lines to power outages.

The utility model solves the above-mentioned technical problems through the following technical solutions: a low-voltage fault line troubleshooting instrument, including a power supply circuit, a signal output circuit, a special wiring device, a control management circuit, an output indication circuit, a leakage detection circuit and a short circuit detection circuit. circuit; the control management circuit is electrically connected to the signal output circuit, the output indication circuit, the leakage detection circuit and the short circuit detection circuit; the power supply circuit is electrically connected to the signal output circuit, the control management circuit and the output indication circuit respectively The signal output circuit is also electrically connected to the leakage detection circuit, the short circuit detection circuit and the special wiring device respectively; the special wiring device is electrically connected to the circuit to be tested;

The control management circuit is used to control the signal output circuit to generate a detection signal, analyze and calculate the feedback results of the leakage detection circuit and the short circuit detection circuit, determine whether there is leakage or short circuit, and then display the detection result through the output indicating circuit;

The power supply circuit is used to provide power for the signal output circuit, the control management circuit, and the output indication circuit;

The signal output circuit is used to generate an intermittent detection signal, and add the intermittent detection signal to the line to be tested through the special wiring device;

The output indicating circuit is used to display the analyzed and calculated detection data and detection results;

The leakage detection circuit is used to detect the magnitude of the leakage current of the signal output circuit, and feed back the detection result to the control management circuit;

The short-circuit detection circuit is used to detect the magnitude of the short-circuit current of the signal output circuit, and feed back the detection result to the control management circuit;

The special wiring device is used to connect with the circuit to be tested, to add the intermittent detection signal to the circuit to be tested, and to feed back the leakage current and short-circuit current in the circuit to be tested to the signal output circuit.

Further, the control management circuit uses a high-speed single-chip microcomputer control system with a model number of STC12A5C60S2.

Further, the power supply circuit is a rechargeable lithium-ion battery.

Further, the signal output circuit is a signal output circuit mainly composed of IGBTs, and generates intermittent detection signals under the control of the control management circuit.

Further, the output indication circuit is a 4.3-inch touch screen with a model number of DOP-B03S201.

Further, the leakage current sensor of the LF series is selected for the leakage detection circuit; the high frequency current transformer with fast response time is selected for the short circuit detection circuit.

Further, the dedicated wiring device includes 4 wiring caliper, and the 4 wiring caliper are respectively connected to the A, B, C three-phase and ground wire terminals of the circuit to be tested.

Further, the power supply circuit, signal output circuit, control management circuit, leakage detection circuit and short circuit detection circuit are all installed in an engineering plastic box, and the top of the engineering plastic box is provided with a hand-held part, which is convenient to carry, and is pressure-resistant and moisture-proof .

Further, a control panel is provided on the front of the engineering plastic box, and the control panel is provided with the output indicating circuit, signal interface, indicator light, control buttons, charging port and power switch; the signal interface includes a Phase interface, B phase interface, C phase interface and grounding interface, the signal interface is connected with the output end of the signal output circuit in the engineering plastic box, and connected with the special wiring device externally; the indicator light includes output indication lamp and a power indicator light, the output indicator light is connected to the output end of the control management circuit; the power indicator light is connected in series with the power switch and connected to the output end of the power circuit; the charging port It is connected to the power supply circuit through a charging line; the control buttons include a start button and a stop button, and the start button and stop button are respectively connected to the input terminals of the control management circuit.

Further, a drawer-type accessory slot is provided on the upper part of the control panel for storing accessories such as special wiring devices and power cords.

Compared with the prior art, the low-voltage fault line troubleshooting instrument provided by the utility model includes a power supply circuit, a signal output circuit, a special wiring device, a control management circuit, an output indication circuit, a leakage detection circuit and a short circuit detection circuit. The circuit control signal output circuit generates an intermittent detection signal, which is input to the line to be tested through a special wiring device, and at the same time detects the leakage current and short-circuit current of the signal output circuit through the leakage detection circuit and the short-circuit detection circuit, and feeds back to The control and management circuit, after the analysis and calculation of the control and management circuit, is displayed on the output indicating circuit to judge whether there is leakage and short circuit in the line to be tested, and can quickly identify the fault of the line, and restore the power supply of the non-faulty line before repairing the fault separately lines, which improves the troubleshooting efficiency of faulty lines and shortens the waiting time for power failure of non-faulty lines;

The utility model adopts a rechargeable lithium-ion battery to provide power without external power supply, and is suitable for on-site operation;

The utility model installs all the circuits in the engineering plastic box, which is convenient to carry, pressure-resistant and moisture-proof, and suitable for transportation and outdoor environment requirements.

Description of drawings

In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only an embodiment of the utility model. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the internal circuit block diagram of a kind of low-voltage fault circuit investigation instrument of the present utility model;

Fig. 2 is a structural schematic diagram of a control panel of a low-voltage fault line troubleshooting instrument of the present invention;

Among them: 1-4.3 inch touch screen, 2-control panel, 3-signal interface, 4-output indicator light, 5-power indicator light, 6-stop button, 7-start button, 8-power switch, 9-charging port, 10-drawer accessory slots.

Detailed ways

The technical solutions in this implementation model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1, a kind of low-voltage fault line investigation instrument provided by the utility model includes a power supply circuit, a signal output circuit, a special wiring device, a control management circuit, an output indication circuit, a leakage detection circuit and a short circuit detection circuit; control management The circuits are respectively electrically connected to the signal output circuit, the output indicating circuit, the leakage detection circuit and the short circuit detection circuit; the power supply circuit is respectively electrically connected to the signal output circuit, the control management circuit and the output indicating circuit; The detection circuit is electrically connected to the special wiring device; the special wiring device is electrically connected to the circuit to be tested.

The control management circuit uses a high-speed single-chip microcomputer control system of the model STC12A5C60S2, which is used to control the signal output circuit to generate detection signals, and analyze and calculate the feedback results of the leakage detection circuit and short-circuit detection circuit to determine whether there is leakage or short circuit, and then display through the output indication circuit Get the test result.

The power circuit is a rechargeable lithium-ion battery, which is used to provide power for the signal output circuit, control management circuit, and output indication circuit, and is suitable for on-site operations.

The signal output circuit is a signal output circuit mainly composed of IGBTs. Under the control of the control management circuit, an intermittent detection signal is generated, and the intermittent detection signal is added to the line to be tested through a special wiring device. If the equipment in the line is affected, you can check whether there is leakage or short circuit through signal feedback.

The output indication circuit uses a 4.3-inch touch screen with a model number of DOP-B03S201, which is used to display the detected data and results after analysis and calculation.

The leakage detection circuit uses LF series leakage current sensors to detect the leakage current of the signal output circuit, and feeds back the detection results to the control management circuit; the short-circuit detection circuit uses high-frequency current transformers with fast response time to detect signal Output the short-circuit current of the circuit, and feed back the detection result to the control management circuit.

The special wiring device includes 4 wiring calipers, and the 4 wiring calipers are respectively connected to the A, B, C three-phase and ground terminals of the line to be tested, and the intermittent detection signal generated by the signal output circuit is added to the line to be tested, and at the same time Feedback the leakage current and short-circuit current in the circuit to be tested to the signal output circuit.

The power supply circuit, signal output circuit, control management circuit, leakage detection circuit and short circuit detection circuit are all installed in the engineering plastic box. The top of the engineering plastic box is equipped with a hand-held part, which is easy to carry and resistant to pressure and moisture.

As shown in Figure 2, the front of the engineering plastic box is provided with a control panel 2, and the control panel 2 is provided with a 4.3-inch touch screen 1 of DOP-B03S201, a signal interface 3, an indicator light, control buttons, a charging port 9 and a power switch 8; The signal interface 3 includes a phase A interface, a B phase interface, a C phase interface and a grounding interface; the A phase interface, the B phase interface, the C phase interface and the grounding interface are connected to the output end of the signal output circuit in the engineering plastic box, The outside of the box is respectively connected to the A, B, C three-phase and ground wire terminals of the circuit to be tested through four wiring caliper; the indicator light includes the output indicator light 4 and the power indicator light 5, the output indicator light 4 and the output terminal of the control management circuit connected to indicate whether the output is normal; the power indicator light 5 is connected in series with the power switch 8, and then connected to the output end of the power circuit, the power indicator light 5 is used to indicate whether the power supply is normal, and the power switch 8 is used to control the power on and off. Close; the charging port 9 is connected to the input terminal of the power supply circuit through the charging line in the engineering plastic box, and connected to the external power supply through the power line outside the engineering plastic box to charge the rechargeable lithium-ion battery; the control buttons include start button 7 and stop The button 6, the start button 7 and the stop button 6 are respectively connected to the input end of the control management circuit, and are used to control the start and stop of the troubleshooter.

The top of the control panel 2 is also provided with a drawer-type accessory slot 10 for storing accessories such as special wiring devices and power cords.

The working principle of the low-voltage fault line troubleshooting instrument of the utility model: under the control of the control management circuit, the signal output circuit composed of IGBT generates an intermittent detection signal, and the intermittent detection signal is added to the voltage level of 220V/ On the 380V line to be tested, at this time, the leakage current and short-circuit current of the signal output circuit are respectively detected by the leakage current sensor and the high-frequency current transformer, and the detection signal is fed back to the STC12A5C60S2 microcontroller, which is output to 4.3 after being analyzed and calculated by the STC12A5C60S2 microcontroller inch touch screen 1, displaying the detection data and whether there is leakage or short circuit.

What is disclosed above is only the specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any skilled person familiar with the technical field can easily think of changes or modifications within the technical scope disclosed by the utility model. Variations should be covered within the protection scope of the present utility model.

Claims (10)

1. A low-voltage fault line investigation instrument, is characterized in that: comprise power supply circuit, signal output circuit, dedicated wiring device, control management circuit, output indication circuit, electric leakage detection circuit and short circuit detection circuit; Described control management circuit is connected with all The signal output circuit, the output indication circuit, the leakage detection circuit and the short circuit detection circuit are electrically connected; the power supply circuit is electrically connected with the signal output circuit, the control management circuit and the output indication circuit respectively; the signal output circuit is also connected with the leakage The detection circuit, the short circuit detection circuit and the special wiring device are electrically connected; the special wiring device is electrically connected to the circuit to be tested; The control management circuit is used to control the signal output circuit to generate a detection signal, analyze and calculate the feedback results of the leakage detection circuit and the short circuit detection circuit, determine whether there is leakage or short circuit, and then display the detection result through the output indicating circuit; The power supply circuit is used to provide power for the signal output circuit, the control management circuit, and the output indication circuit; The signal output circuit is used to generate an intermittent detection signal, and add the intermittent detection signal to the line to be tested through the special wiring device; The output indicating circuit is used to display the analyzed and calculated detection data and detection results; The leakage detection circuit is used to detect the magnitude of the leakage current of the signal output circuit, and feed back the detection result to the control management circuit; The short-circuit detection circuit is used to detect the magnitude of the short-circuit current of the signal output circuit, and feed back the detection result to the control management circuit; The special wiring device is used to connect with the circuit to be tested, to add the intermittent detection signal to the circuit to be tested, and to feed back the leakage current and short-circuit current in the circuit to be tested to the signal output circuit. 2. The low-voltage fault line troubleshooting instrument according to claim 1, characterized in that: the control management circuit is a high-speed single-chip microcomputer control system whose model is STC12A5C60S2. 3. The low-voltage fault line troubleshooting instrument according to claim 1, wherein the power supply circuit is a rechargeable lithium-ion battery. 4. The low-voltage fault line troubleshooting instrument according to claim 1, wherein the signal output circuit is a signal output circuit mainly composed of IGBTs, and generates intermittent detection signals under the control of the control management circuit. 5. The low-voltage fault line troubleshooting instrument according to claim 1, characterized in that: the output indicating circuit is a 4.3-inch touch screen model DOP-B03S201. 6. The low-voltage fault line troubleshooting instrument according to claim 1, characterized in that: the leakage current sensor of the LF series is selected for the leakage detection circuit; and a high-frequency current transformer with a fast response time is selected for the short-circuit detection circuit. 7. The low-voltage fault line investigation instrument as claimed in claim 1, characterized in that: said dedicated wiring device comprises 4 wiring calipers, and said 4 wiring calipers are respectively connected to A, B, C three-phase and Ground terminal connection. 8. The low-voltage fault line investigation instrument as claimed in claim 1, characterized in that: said power supply circuit, signal output circuit, control management circuit, leakage detection circuit and short circuit detection circuit are all installed in engineering plastic boxes, and said engineering The top of the plastic box is provided with a handle. 9. The low-voltage fault line troubleshooting instrument according to claim 8, characterized in that: the front of the engineering plastic box is provided with a control panel, and the control panel is provided with the output indicating circuit, signal interface, and indicator light , control buttons, charging port and power switch; the signal interface includes a phase A interface, a B phase interface, a C phase interface and a grounding interface, and the signal interface is connected to the output end of the signal output circuit in the engineering plastic box, Externally connected with the special wiring device; the indicator light includes an output indicator light and a power indicator light, and the output indicator light is connected to the output terminal of the control management circuit; the power indicator light is connected in series with the power switch , and connected to the output end of the power circuit; the charging port is connected to the power circuit through a charging line; the control buttons include a start button and a stop button, and the start button and the stop button are respectively connected to the control management The input terminal of the circuit is connected. 10. The low-voltage fault line troubleshooting instrument according to claim 9, characterized in that: a drawer-type accessory slot is provided on the upper part of the control panel for storing special wiring devices and power cords.