How does a circuit breaker trip? What is the cause of a tripping in a power failure

The circuit breaker tripped.

It can be divided into several kinds, the key is to look at the model of the circuit breaker short circuit tripping: This is the function that the general circuit breaker has, he is made of the current coil, when the current reaches its tripping current value, electromagnetic force.

Attracting its tripping device to trip. It belongs to electromagnetic tripping. Generally, it is 6 to 10 times of the rated current, and different tripping levels are different multiples of overload tripping:

It is available in the short circuit of motor protection. Overload is a process of heat accumulation, in which there are bimetal sheets, but to a certain extent of heat accumulation, the bimetal sheets are bent due to the different expansion coefficients of the two metals, driving the tripping mechanism to trip. There is a corresponding current trip time curve.

Undervoltage tripping, which is not generally available in short-circuits. When the voltage is low, the suction power of the solenoid coil is not enough to sustain it. And tripping.

Overvoltage tripping, when the voltage is too high electromagnet.

action, drive the tripping mechanism to trip.

The main principle is to use temperature, when a short circuit occurs, the temperature of the wire rises, something in the short circuit is heated, and the melting point is low, the fuse is broken, and it trips; Forehead.

Overvoltage or short circuit protection.

Circuit breaker tripped principle:

The circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a tripper, a shell, etc. When there is a short circuit, the magnetic field generated by the high current (generally 10 to 12 times) overcomes the reaction spring, the tripper pulls the operating mechanism to act, and the switch trips instantaneously. When overloaded, the current becomes larger, the heat generation intensifies, and the bimetal sheet deforms to a certain extent to push the mechanism to act (the larger the current, the shorter the action time).

Supplement: Circuit breaker refers to a switchgear that can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a specified time.

The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, protect the power supply line and the motor, and automatically cut off the circuit when they have serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and over/underheat relay. In addition, it is generally not necessary to change the parts after the fault current is switched off. At present, it has been widely used.

Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their use range, and the division of high and low voltage lines is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances.

For AC and DC pulsating fault currents.

Under normal circumstances, the magnetic field generated by the primary side (primary side) three-phase current of the zero-sequence current transformer in its core cancels each other, so there is no induced potential on the secondary side (secondary side), so there is no current generated in the degaussing coil of the polarized solenoid. In this case, the suction of the polarized solenoid overcomes the tension of the reaction spring, pulls the armature in the closed position, and thus engages the circuit breaker. When the powered equipment leaks, the three-phase current on the primary side of the zero-sequence current transformer is out of balance, and the induced potential will be generated on the secondary side coil.

As a result, the demagnetizing coil of the polarized solenoid generates an electric current, which produces an alternating magnetic flux. This magnetic flux weakens the polarized solenoid suction. When the signal generated on the secondary side is equal to or greater than the pre-set value, the polarized solenoid attraction is less than the tension of the reaction spring, thus releasing the armature.

The action lever connected to the armature pulls (or pushes) the tripping mechanism to act quickly, disconnecting the circuit breaker and cutting off the power supply.

The three reasons for tripping are as follows:1. Household appliances are too heavy and higher than the rated load, this kind of trip is overload protection tripping, and the electrical device can be reduced.

2. Some electrical appliances in the home are grounded and tripped due to leakage protection. When an electrical appliance is turned on and tripped, it should be checked first whether there is a suspicion of leakage, or the load of high-power electrical appliances has accumulated to a higher than the rated load.

3. Detect whether the equipment is leaking can turn off other electrical appliances, open the equipment separately, if it is opened normally, it means that the equipment does not leak, if it also trips, it means that the fault is due to this equipment.

The possible reasons are: 1. The switch does not match the load. After buying new high-power appliances such as air conditioners and water heaters at home, check whether the switch matches the rated power.

2. Electrical appliances or lines leakage and short circuit. Leakage and short circuit are one of the important causes of tripping. 3. Aging of the line.

After the line ages, the load degree of the line itself will decrease, resulting in tripping. Solution: 1. The switch does not match the load

After buying new high-power appliances such as air conditioners and water heaters at home, check whether the switch matches the rated power. If it does not match, ask a professional electrician to replace the matching switch. 2. Electrical appliances or lines leakage and short circuit.

Leakage and short circuit are one of the important causes of tripping. It is recommended that after cutting off the circuit, ask the electrician to check the safety of the circuit one by one to eliminate the potential safety hazards in time. 3. Aging of the line.

As it ages, the load on the line itself decreases. In hot and humid weather, the insulation is easy to fail, causing tripping. A professional circuit technician should be asked to check the situation.

4. Aging of switches: If the leakage switch at home has been used for a long time, the parts may be aging, and it is easy to trip for no reason. A professional should be asked to replace the switch with a new one to ensure the proper operation of the switch.

5. The trip situation will actually have an impact on every electrical appliance in the house, and at the same time, each item has the possibility of causing problems, so the first thing to solve the problem is to find the root cause of the problem, and then repair it.

Ann, you're talking about household circuit breakers. It should be a DZ47 ,,, 220V,,, your problem is that you can't find the reason for the trip. That's all I have to say1

The rated current of your home circuit breaker may be too small, calculate it yourself. Circuit breaker current》Line working current times.

Current calculations. Current = Power Voltage. Such as hair dryer 1000w voltage 220

Current = 1000 220 = 32-63 circuit breakers are generally used at home) 2There may be a leakage of current of a few milliamps. If you go to check the above yourself,,Your professional person to deal with it.。。。 Safety first...

Circuit breaker is a commonly used circuit protection device in the home, and in the use of engineering, circuit breakers often trip. So what are the reasons for the circuit breaker tripping? Let's take a look.

1. Short circuit is only funny: when the live wire is in contact with the neutral line, a large current will be generated, and eventually a short circuit will occur, causing the circuit breaker to trip. 2. Overload:

If the overload protection current of the circuit breaker is too large, the circuit breaker will trip. 3. Leakage: If the circuit breaker is in use, it will also cause automatic tripping.

What is the difference between a circuit breaker and an air switch.

1. The air switch mainly plays a protective role in the circuit, so it is also called an air circuit breaker.

2. The circuit breaker has good arc extinguishing ability in the circuit, and when it is in the case of large current, it can play the role of automatic tripping. In high voltage, it is often used for power outage and power transmission operation.

3. From the perspective of voltage, the level of air switching voltage is below 500V, while the circuit breaker is suitable for the level above 220V.

4. The ability to block the current is different: in addition, the current of the circuit breaker is larger than that of the empty switch.

5. The difference between the arc extinguishing medium and the method: from the perspective of their arc extinguishing methods, the arc extinguishing methods of the former have not only air circuit breakers, but also vacuum circuit breakers and multi-oil circuit breakers, etc., and the arc extinguishing medium stool and methods are more than air switches.

6. The difference between supporting equipment: from the perspective of supporting equipment, the equipment of air switch will be more complicated.

7. The circuit breaker contains more products and models, and the current is larger than that of the air switch, and the capacity is also larger. Circuit breakers are typically used in 6kV circuit systems and use a DC power supply of 110V as the power supply for control.

Summary: The above is about the reasons for the tripping of circuit breakers, I believe everyone understands it! There are many reasons why the circuit breaker trips, so when such a situation occurs, it is necessary to carefully find out the cause of the line in the home, and then take the right way to deal with it.

The reasons why a circuit breaker trips are:1. Overload protection: The current setting value of the circuit breaker is too low, and the power of the load is greater than the rated power of the circuit breaker.

2. Circuit short circuit protection: check whether the power plug is dry.

3. Leakage protection: the line is aging and leaking, resulting in the power of both the live wire and the neutral line.

4. Under-voltage protection: the voltage is unstable, and it will automatically trip when the voltage drops to the set value.

Here's how to handle a circuit breaker trip:

1. First of all, we must be clear about the air switch and the air switch with leakage protection. Turn off the main air switch, then turn off the air switch one after the other, and finally turn off the air switch with leakage protection.

2. If the leakage protection switch cannot be closed, it means that there is a problem with the leakage protection switch and it needs to be replaced with a new one. If the leakage protection switch is switched on and then trips again, there is a problem with the line.

1. Overload tripping.

This is often referred to as the air switch tripping. Especially in the coming winter, a lot of high-power electrical appliances should be used at home, taking electric heaters as an example, the maximum power of an ordinary electric heater has reached more than 2000W, when several same high-power heating equipment work together, or each socket under the same circuit breaker is connected to the heating equipment, at this time, it is easy to cause the circuit load to be too high, causing the circuit breaker to open the overload protection mode - that is, tripping.

2. Short-circuit tripping.

The display of short-circuit tripping on the circuit breaker is the same as overload tripping, both are air switch trips, but short-circuit tripping often has a prominent performance: after closing the tripping switch, it is like tripping again, which is often short-circuit tripping. In this case, it is recommended that you keep the circuit breaker disconnected first, and seek help from an electrician immediately, and remember not to try to solve it yourself.

3. Leakage tripping.

Leakage tripping is different from air tripping, and leakage tripping protects the safety of people. If the circuit breaker does not close, you need to find a professional electrician to repair it.

See if it trips or opens empty. Since the socket and the lamp are two control circuits, you can check whether the air switch in the row of control sockets is jumped. It's useless to press back, you can't close the gate, generally in the socket line, there is a short circuit, you should check the socket in the line, which has a problem Brother Nian, troubleshooting, the switch can be closed.

Each is the destruction of the air switch, you can try the nuclear high oak instead.

Conception. The main task of the traction substation is to supply power to the catenary. In addition to the equipment failure of the traction substation (opening and closing station, partition pavilion) itself (the proportion of this situation is very small), the short-circuit current that causes the "tripping" mainly comes from the catenary.

The catenary is in an uninterrupted state of operation, and the electric locomotives under the catenary are constantly performing busy transportation tasks, as well as the joint coordination of transportation and public works departments. Accidents in any area can affect the catenary and "trip" the circuit breaker.