Dual protection for power grid and motor! Detailed explanation of multiple protection functions of NRRQV soft starter

High-voltage motor is the core power equipment in industrial production, but its starting and operation process is accompanied by a large number of electrical and mechanical risks, such as instantaneous surge, voltage anomaly, load faults, high temperature, etc., which can easily lead to motor burnout, power grid fluctuations, production line tripping. Traditional startup equipment has only a single protective function and can only reach basic current limit, so it cannot avoid the operation hazard completely. The NRRQV high-voltage solid-state soft starter is equipped with a set of intelligent protection system, which realizes the dual safety mechanism of voltage stability protection and all-round motor protection. From start to normal operation, the whole process of monitoring, intelligent warning, self-locking fault, to build a stable high voltage electrical system security line.
The protective function of factory power grid is one of the core advantages of NRRQV soft starters. Direct starting of high voltage motor will produce several times the rated pulse current, cause the voltage of the power grid to drop, cause the same circuit precision equipment fault, garbled instruments, relay protection misoperation, and affect the power supply stability of the whole plant. The device adopts thyristor stepless voltage regulation technology, which can control the starting current smoothly at 2-3 times the rated current, prevent sudden change of current and voltage, and effectively restrain the harmonic and voltage fluctuations of the power grid. At the same time, the device has the functions of overvoltage, undervoltage and phase loss protection, and can monitor the voltage status of the three-phase grid in real time. When the power grid malfunctions, such as voltage abnormalities and phase loss, lock up the startup program immediately, stop the alarm, avoid damage to the electrical equipment caused by abnormal condition of the power grid conditions, and ensure the stable operation of the distribution system.
In the field of motor protection, NRRQV has the ability of fine, all-weather fault protection, which completely solves common faults in the operation of HV motor. The device is equipped with high precision current acquisition module, supporting overload, overflow, stall protection, can accurately identify motor load overload, overload jamming, equipment stall. If blower, water pumps, crusher and other equipment are suddenly stuck by load during production, the system will immediately detect abnormal current, and immediately cut off output, to prevent the motor winding overheating combustion, shaft wear and fracture, etc. The NRQV NRRQV fast protection device minimizes equipment equipment failure losses to the lagging response of traditional protection devices.
Temperature protection and self-protection of equipment to ensure long-term stable operation of equipment. The thyristor, the core power device of a high voltage soft starter, is extremely sensitive to temperature. Long time overload operation, high temperature environment, poor heat dissipation, it is easy to cause device aging and failure, resulting in equipment failure. NRRQV is equipped with a high precision temperature sensor that can monitor the working temperature of the power module in real time, and features hyper-temperature alarm and hyper-temperature shutdown. As the temperature of the device approaches the critical point, an automatic warning is issued, and if the temperature exceeds the critical point, protective gear should be locked immediately to prevent failures such as thyristor burnout and equipment breakdown. It is also equipped with a heat dissipation duct and an intelligent heat dissipation system, suitable for continuous operation 24 hours a day, and provides a strong operational safety barrier from the inside of the equipment to avoid secondary damage to the motor and power grid due to the device's own failure.
In addition, the device is equipped with a comprehensive intelligent fault diagnosis and self-locking protection system, covering three-phase imbalance, startup timeout, external fault interlocking, and multiple other protections. In industrial production, aging of the circuit, loose connection, uneven load, etc., are easy to cause three-phase current imbalance, in the long-term operation process will increase the loss of the motor and reduce service life. NRRQV can accurately identify three-phase imbalance faults and provide timely shutdown protection. At the same time, in order to avoid repeated shock damage to the motor, the system automatically locks out the fault state due to the startup failure of starting, incomplete starting and so on. All faults can be automatically recorded in code, making it easy for operation and maintenance personnel to quickly troubleshoot and repair, greatly increasing the efficiency of fault handling.
The comprehensive dual protection system is different from the the NRRQV high-voltage solid-state soft starter ordinary start-up equipment. It not only solves the problem of high voltage motor starting shock, but also realizes the safety protection of the power grid, motor and equipment, and avoids production risks of electrical fault, mechanical damage and fluctuation of power grid fluctuations from the source. Multiple protection mechanism can effectively reduce equipment failure rate, minimize downtime losses, prolong motor service life, and provide a solid electrical safety guarantee for enterprises to safely produce and stabilize mass production in high-risk industries such as mines, chemicals, water conservancy and electricity.