The three common circuit faults include contactor fault, voltage breaker fault and thermal relay fault. Contactor fault mainly refers to the open circuit, short circuit, adhesion and other problems of the contactor contacts, which lead to the failure of normal power on or power off of the circuit. Voltage circuit breaker failure means that the voltage circuit breaker cannot cut off the circuit normally, or cannot close the circuit normally, thus causing the circuit to fail to work normally. Thermal relay fault refers to that the thermal relay cannot respond to the temperature change of the circuit normally, resulting in the circuit cannot be automatically opened or closed as required.
Contactor fault is one of the common circuit faults. BCP53 contactor is an electromagnetic switch, which is usually used to control the start and stop of motors, lights and other electrical equipment. The contacts of the contactor are often opened and closed, and wear and poor contact are easy to occur after long-term use. The open contact will cause the circuit to fail to power on, the short contact will cause the circuit to fail to power off, and the contact adhesion will cause the contactor to fail to switch normally. These faults will cause the circuit to fail to work normally, and the contactor needs to be replaced or repaired in time.
Voltage circuit breaker fault is another common circuit fault. Voltage circuit breaker is a switching device used to protect the circuit, which can automatically cut off the circuit in case of short circuit or overload. Because voltage circuit breaker often bears current impact and load change, long-term use is prone to contact wear, spring looseness or fracture and other problems, resulting in circuit failure to cut off or close normally. The failure of voltage circuit breaker will lead to the failure of normal protection of the circuit, which may lead to overload, short circuit or other potential safety hazards of the circuit.
Thermal relay fault is another common circuit fault. Thermal relay is a kind of electromagnetic switch device that can automatically open or close according to the circuit temperature change. It is usually used for overload protection of the circuit. When the circuit is overloaded, the thermal relay will automatically cut off the circuit to prevent overheating damage. Thermal relay faults mainly include problems such as being too sensitive or insensitive, unable to cut off or close normally, etc. Too sensitive will cause the thermal relay to open or close frequently, affecting the normal operation of the circuit; The insensitivity will cause the thermal relay to fail to cut off the circuit in time, which may lead to overload and damage of the circuit.
In order to avoid these circuit faults, we need to pay attention to the following points when using and installing electrical equipment:
1. Check and maintain electrical equipment regularly. Regularly check whether the contacts, rods, springs and other parts of contactors, voltage circuit breakers and thermal relays are intact. If there is any problem, replace or repair them in time.
2. Avoid overloading electrical equipment. The rated load of electrical equipment refers to the maximum load that the equipment can operate normally. If the rated load is exceeded, the equipment will overheat, burn out or even cause fire and other safety problems.
3. Avoid switching electrical equipment frequently. Frequent switching will lead to increased wear of equipment contacts, increasing the risk of poor contact and failure.
4. Avoid high or low ambient humidity. High humidity will cause the insulation material of electrical equipment to be damp, resulting in contact adhesion or leakage and other faults; Low humidity will cause dry contacts, increase contact resistance and affect the normal operation of electrical equipment.
5. Carry out circuit inspection and maintenance regularly. Regularly use multimeter and other tools to test the circuit to ensure that the working voltage and current of electrical equipment meet the requirements.
In a word, contactor fault, voltage breaker fault and thermal relay fault are common circuit faults. When using and installing electrical equipment, we need to pay attention to regular inspection and maintenance, avoid overload use, avoid frequent switching, pay attention to environmental humidity, and conduct regular circuit detection and maintenance to reduce the occurrence of circuit faults.
