Due to the wrong operation or what can cause a short circuit

Summary. Dear, I'm glad to answer that not all short circuits in the circuit will cause serious problems. Short circuit is a very serious fault for the circuit, unless the equipment allows short circuit, short circuit is very harmful, if the current is very large, then directly burn the wire or power supply, cause a fire, how can it be connected to the circuit for a long time, of course, the line will generally have a protection switch to protect, but also should avoid unnecessary short circuit test.

Dear, I'm glad to answer that not all short circuits in the circuit will cause serious problems. Short circuit is a very serious fault for the circuit, unless the equipment allows short circuit, short circuit is very harmful, if the current is very large, then directly burn the wire or power supply, cause a fire to search for jujube transport, how Yan Lao may be able to connect to the circuit for a long time, of course, the line will generally have a protection switch to protect, but also should avoid unnecessary short circuit test.

Several situations of short circuit: starvation line aging, insulation damage and short circuit. The power supply is short-circuited, that is, the current does not pass through any electrical appliances, and flows directly from the positive and simple Li pole back to the negative electrode through the wire, which is easy to burn out the power supply.

Short circuit with rotten electrical appliances is also called short circuit in part of the circuit. Connection error. Meteorological conditions, such as scintillation discharges caused by lightning strikes, overhead line disconnection due to wind damage, and power pole collapse due to wire icing, etc.

Leakage means that the insulation of the wire decreases due to some reason (wind, rain, sun, moisture, pressure, scratching, friction, corrosion, etc.) in a certain place of the line, resulting in the passage of some current between the line and the line and the ground. The main hazards of leakage faults are these.

1. Personal electrocution.

When electrical equipment is energized due to insulation damage, and workers come into contact with this shell, it can lead to a personal electric shock accident. At this point, a portion of the ground current will flow through the body.

If the value is large enough to a certain extent, it will cause the staff to lose **. When the worker touches the core wire that punctures the outer sheath of the rubber cable and is exposed to the air, it is a more serious personal electric shock, at this time, most of the ground current flows through the human body, so the danger to the staff is greater.

2. Cause swamp gas and coal dust**.

Most of China's coal mines have the danger of biogas and coal dust, when the biogas and coal dust in the underground air reach the highest concentration and there is an ignition source of energy, biogas active coal dust will occur.

The vast majority of the ignition sources in the underground are electric sparks, and the electric sparks generated by leakage account for a considerable proportion, when the power grid occurs single-phase grounding or equipment occurs single-phase collision shell, electric sparks will be generated at the grounding point, if the electric spark has enough energy, it may ignite biogas and coal dust.

3. Make the electric detonator unprepared to detonate.

The leakage current will produce a potential difference in the path through it, the larger the value of the leakage current, the greater the potential difference generated, if the leads at both ends of the electric detonator are accidentally connected with the two points on the leakage circuit with a certain difference in the open change, the electric detonator may be unprepared for the accident.

4. Burn electrical equipment and cause disasters.

The long-term leakage current, especially the leakage current of the two-phase resistance grounding, will emit a large amount of heat when passing through the equipment to determine the insulation damage, further damage the insulation, and even cause flammable materials (such as non-flame retardant rubber cables) to catch fire.

5. Cause short-circuit accidents According to statistics, about 30% of single-phase grounding faults develop into short circuits. This results in a greater electrical failure. It poses a serious threat to mine safety.

The reason why the leakage fault develops into a short circuit is very simple, the long-term leakage current and electric spark make the insulation of the leakage type electric place further damaged, and finally endanger the interphase insulation and cause a short circuit.

Summary. Hello dear, happy to answer your <>

In a smart grid, short-circuit faults can occur on different lines, including overcurrent, ground faults, etc. Depending on the type of fault, the protection system will behave differently. 1.

Over-current protection: Over-current protection is the most commonly used protection method in smart grids, which is mainly used for the detection and protection of short-circuit faults. When the current in the circuit exceeds the set value of the rated current, the protection device will send a signal to trigger the tripping action of the circuit breaker or disconnector to protect the grid equipment from damage.

2.Overvoltage protection: Overvoltage protection is mainly used to protect equipment from damage when the grid voltage is too high.

When the grid voltage exceeds the set value of the rated voltage, the protection device will send a signal to trigger the tripping action of the circuit breaker or disconnector to prevent the grid voltage from affecting the equipment.

Short-circuit faults occur separately on different lines to protect those actions.

Hello dear, happy to answer your <>

In a smart grid, short-circuit faults can occur on different lines, including overcurrent, ground faults, etc. Depending on the type of fault that is not stupid, the protection system will act differently. 1.

Over-current protection: Over-current protection is the most commonly used protection method in smart grids, which is mainly used for the detection and protection of short-circuit faults. When the current in the circuit exceeds the set value of the rated current, the protection device will send out a signal tape French number to trigger the tripping action of the circuit breaker or disconnector to protect the power grid equipment from damage.

2.Overvoltage protection: Overvoltage protection is mainly used to protect equipment from damage when the grid voltage is too high.

When the grid voltage exceeds the set value of the rated voltage, the protection device will send a signal to guess the tripping action of the circuit breaker or disconnector to prevent the grid voltage from affecting the equipment.

Kiss, the following is supplemented; 3.Overload protection: Overload protection means that when the equipment is overloaded, the protection device detects and sends a signal in time to trigger the tripping action of the circuit breaker or isolation switch to avoid thermal damage to the equipment.

4.Grounding protection: Grounding protection mainly refers to the fact that when there is a grounding fault in the cable or equipment, the protection device will detect and send a signal in time to trigger the tripping action of the circuit breaker or isolation switch to protect the safe operation of the power grid and equipment.

In general, the protection system in the smart grid will choose different protection methods according to different fault types and equipment characteristics, and realize the protection and safe operation of power grid equipment through the monitoring and detection of circuits.

Among the various types of short-circuit faults, the most dangerous short-circuit fault is ().

a.Three-phase short circuit.

b.Two-phase short circuit.

c.Single-phase grounding short scatter to do hole road.

d.Two-phase grounding short-circuited Hula.

The answer is true: a