What are the common circuit faults? What are the causes of circuit failures

Common circuit faults are as follows:

1. Short circuit: A short circuit will put the fuse of the lamp.

When it blows, the lamp burns out. In fact, it is made by the collision of two wires in the socket.

into the results. 2. Broken circuit: Broken circuit will cause all electrical appliances to fail to operate normally, that is, the circuit is short, and the circuit between the lamp holder, the switch and the line is broken.

Is the fuse broken or the line entering the house broken?

3. When installing the line, each route was not installed, the lower road was disordered, and all the lines were connected together.

4. Load: The total power of the electrical appliance is too large, and it has exceeded the range that the circuit can bear, and there will be a short circuit.

5. Poor contact.

That is, the contact is not real, the contact of the hanging box is poor, the fuse contact is poor, the contact at the line joint is poor, etc. This.

It will make the lights flicker on and off, and the electrical appliances will not work continuously.

Common faults in circuits.

1) Break the circuit. For example, the filament is broken, the lamp holder, switch, hanging box is broken, the fuse is blown or the inlet wire is broken, etc. Breaking the circuit will cause the electrical appliances to be unable to work with electricity.

2) Short circuit. If the live wire and the neutral wire connected to the two binding posts of the lamp holder collide, the two wires in the socket collide. The short circuit will blow the fuse and cut off the power of the entire lighting circuit, and in serious cases, it will burn the line and cause a disaster.

3) Overload. The total power of the appliances in the circuit is too large or the power of the individual appliances is too large. The resulting phenomena and consequences are the same as short circuits.

4) Poor contact.

Such as lamp holder, switch, hanging box poor contact, fuse contact, line joint poor contact, etc. This will make the lights flicker on and off, and the electrical appliances will not work continuously.

5) Connection error.

There are many causes of faults, and the situation is also very complex, some are simple faults caused by one cause, and some are complex faults caused by the interaction of multiple reasons. Therefore, it is difficult to classify the causes of failures simply. Only some cursory analysis can be made here.

1.For the failure of the stereotyped product after a period of use, the cause of the failure may be the damage of the components, the short circuit or open circuit of the connection (such as solder joint virtual welding, poor contact of connectors, potentiometers, semi-variable resistors, etc., poor contact of the surface of the contact surface, oxidation of the surface coating, etc.), or changes in the use conditions (such as grid voltage fluctuations, over-cold or over-hot working environment, etc.) affect the normal operation of electronic equipment.

2.For newly designed circuits, the cause of failure may be: the actual circuit does not match the schematic diagram of the design; The use of components should not be damaged; The designed circuit itself has some serious shortcomings and does not meet the technical requirements; A short circuit or open circuit occurs in the connection.

3.Faults caused by incorrect use of the instrument, such as abnormal or no waveform caused by incorrect use of the oscilloscope, improper handling of grounding problems and the introduction of interference, etc.

4.Failures caused by various interferences.

Most circuit faults are due to poor contact or short circuits, which are more common.

This aspect is caused by many factors such as dust, moisture, aging components, short circuit, excessive load and so on.

Circuit failures can be caused by aging and possibly moisture.

Analysis of the main causes of circuit failures:1. Open circuit, when the circuit is disconnected somewhere, no current passes through the circuit, and the electrical appliance cannot work, it is an open circuit. Includes:

The internal circuit of the electrical appliance is broken, the live wire is broken, and the neutral line is broken. The main causes of the open circuit: disconnected wires, falling off the wire ends, poor contact, burned out electrical appliances, etc.

2. Short circuit, the main reason for short circuit: the live wire and the neutral wire are directly connected with a wire, which causes the live wire and the neutral wire to be directly connected during installation, or the live wire and the neutral wire are directly connected with the electrical appliances; The insulating skin of the wire or electrical appliance is damaged due to aging, resulting in the direct connection between the live wire and the neutral wire. In the event of a short circuit, the resistance in the circuit is small, which is equivalent to the resistance of the wire, and the current in the circuit will be large.

3. Overload, when too many electrical appliances are used at the same time (multiple users use multiple high-power electrical appliances at the same time or use multiple high-power electrical proximity devices on a socket), the total power of the electricity or filial piety pin is too large, so that the current in the circuit is too large, exceeding the current allowed by the circuit, resulting in a fuse.

Blowing or burning out the energy meter.

or cause the voltage at both ends of the electrical appliance to be lower than the rated voltage.

and does not work properly.

The causes of circuit failure are: switch damage, poor contact, short circuit, open circuit, overload, control system malfunction, mechanical jamming, etc.!

,...Short circuit, loose wiring, broken wire, broken socket, switch, etc

1. Circuit breaking: that is, the line is short, the lamp holder, the opening and closing of the chatter, the hanging box is broken, the fuse is blown or the incoming line is broken, etc. It will cause the electrical appliances to be unable to work with electricity;

2. Short Zen brings defeat: that is, the electricity takes a shortcut, and the two wires in the socket collide. The short circuit will blow the fuse and cut off the power of the entire lighting circuit, and in severe cases, it will burn the line and cause a disaster;

3. Overload: that is, it cannot bear the load, and the total power of the electrical appliances in the circuit is too large or the power of a single electrical appliance is too large;

4. Poor contact: that is, the contact is not real, the contact of the hanging box is poor, the fuse is poor, the contact is poor, the contact is poor, etc. It will make the lights flicker on and off, and the electrical appliances cannot work continuously;

5. Confusion on the lower road: The lines used are connected together in a chaotic manner.

A circuit fault is a malfunction of a guide wire or electronic device that loses its normal working condition. It is usually manifested as the circuit cannot be opened, there is no output, or the output is abnormal.

1.Cause of circuit failure

Damage to circuit components, such as coil burnout, capacitor leakage, integrated circuit chip burnout, etc.

The welding brigade is not well connected, resulting in unstable circuit or poor contact.

Interference from external factors, such as light, temperature, humidity and other factors, causes damage to electronic components.

Power supply problems, such as power supply voltage too high or too low, power supply fluctuations, etc.

2.Classification of circuit faults

Open circuit fault: refers to the phenomenon that a circuit is broken in a certain part of the circuit, and the current cannot pass.

Short-circuit fault: refers to the phenomenon of short circuit between two electrodes in the circuit, and the current is too large to cause the system to not work normally.

Leakage fault: Leakage occurs in a circuit, causing the current to be too large for the device to function properly.

Overvoltage or undervoltage: A supply voltage that is too large or too small can lead to circuit failure.

3.How to troubleshoot circuit faults

Inspect the components to determine which part is damaged and replace the appropriate component.

Perform a soldering check to ensure the stability of the circuit and good contact.

Check the causes of interference from external factors, such as light, temperature, humidity, etc., and take timely measures to adjust.

Check for power supply issues, including whether the supply voltage is too large or too small, and the stability and reliability of the power supply.

4.Prevent circuit failures

Choose reliable components to improve the reliability of the device itself.

Develop a reasonable maintenance plan and regularly inspect and repair the equipment.

Pay attention to the equipment in a complete, stable and clean environment to reduce the interference of external factors on electronic components.

Use a stable power supply to avoid problems such as overvoltage or undervoltage.

Series Circuit FaultThe fault phenomenon of series circuit is generally summarized into two categories: open circuit (also made"Circuit breaking").All electrical appliances do not work, and the ammeter has no indication, only the voltmeter that collapses on both sides of the breakpoint has an indication, and the indication is close to (or equal to) the power supply voltage.

Short circuit. The part of the electrical appliances that are short-circuited does not work, and the ammeter has an indicator, the voltmeter connected to both ends of the short-circuited electrical appliances has no indicator, and the voltmeter connected to both ends of other electrical appliances has an indicator.