Solutions for the petroleum and petrochemical industry
With the continuous increase of crude oil water content in most oil fields in our country, there are generally problems of low efficiency and high energy consumption in oilfield pumping units. To solve this problem, many oil fields have adopted motor variable frequency speed regulation technology, which replaces mechanical stroke adjustment by adjusting the motor speed of the pumping unit, achieving good energy-saving effects.
Advantages of Odeli frequency converter
1. Real "soft start" has been achieved, avoiding excessive mechanical impact on the electric motor, gearbox, and pumping unit, greatly extending the service life of the equipment, reducing downtime, and improving production efficiency.
2. Powerful protection function and strong ability to adapt to voltage fluctuations in the power grid. The frequency converter generally has comprehensive protection functions, including overvoltage, overcurrent, short circuit, overload, phase loss protection, etc. It can prevent damage to the motor caused by sudden changes in the power grid and effectively protect the frequency converter and motor in case of grid side power supply failure.
3. The use of variable frequency speed regulation devices can improve the level of automation and provide a fundamental solution for achieving digital construction in oil fields. A high level of automation can improve production efficiency, reduce work intensity, and standardize equipment control management.
4. The energy-saving effect is obvious. The Odeli variable frequency pumping unit control system realizes real-time speed control of the motor and controls the output power of the motor. And it has achieved energy feedback to the power grid during the power generation process of the pumping unit motor, greatly reducing energy consumption.
Application of Soft Starters in Petrochemical Industry
In the petrochemical industry, the starting performance of electric motors has a significant impact on daily production. Because during full voltage starting, the motor needs to absorb 6-7 times the rated current of the motor from the power grid due to the need for starting torque. For high-power motors, their strong starting current not only means wasting a lot of energy, but also causes significant line voltage reduction, even causing a decrease in grid voltage, affecting the normal operation of other equipment, and also having a significant impact on the power transformer. In addition, when parking, if the power is directly cut off, the propulsion system will suddenly lose torque. Relying on the friction torque of the system to overcome the inertia of the system for free parking will bring many problems to the traction system.
The motor soft starter effectively changes the starting characteristics of the motor and protects the traction system by adopting techniques such as voltage reduction, compensation, or frequency conversion, thereby achieving smooth starting of the motor and mechanical load, reducing the impact of starting current on the power grid, protecting the power grid and mechanical system, saving energy, and reducing the speed impact of large inertia on the equipment caused by starting inertia, thereby extending the service life of the equipment.
The difference between soft start and normal start is that when starting the motor, the starting current of the motor can be reduced by lowering the voltage. The soft starter has a certain specified time, during which the starting voltage is continuously and steadily increased by a voltage regulating device until it reaches the rated voltage.
Application of Intelligent Motor Protectors in the Petrochemical Industry
In modern petroleum industry, electric motors, as a type of driving machinery, have become the foundation of all power machinery. Science and technology are constantly advancing and process control is constantly improving, especially in the requirements of automated production. It is urgent to develop and improve electric motor control and protection equipment to achieve functions such as remote control, telemetry, remote adjustment, fault diagnosis, and centralized control for production processes and large machinery.
At the same time, the petrochemical industry has the characteristics of high flux and continuous operation at full load, which requires extremely high reliability and stability of motor equipment. Once an accident occurs, the cause of the fault must be immediately identified and eliminated to ensure timely resumption of production. For the past, thermal relays have been used as overload protection and control components for motors, but due to the quality and process limitations of the components, they can no longer meet the increasingly developing automation requirements of the petroleum industry. The new intelligent motor protectors can meet the protection and control requirements of motors. As motor protection components, motor protectors effectively ensure the safe operation of motors, replace thermal relays, and use advanced communication technology to achieve motor control automation and achieve significant economic benefits.
The functions of motor protectors
(1) Overload protection function
When an electric motor operates for a long time beyond its rated current under overload conditions, it may overheat, reduce insulation and burn out. The protector calculates the motor's thermal capacity based on its heating characteristics, simulates the motor's heating characteristics, and protects the motor. When the protector detects that the motor is overloaded, it should send an alarm or trip signal within the set time for alarm or trip (delay).
(2) Three phase imbalance protection function
The operation of a phase failure/imbalance fault poses great harm to the motor. When the motor experiences a phase failure or severe three-phase current imbalance, and the imbalance rate reaches the protection set value, the protector will protect it according to the set requirements, issue a stop or alarm, and ensure the safe operation of the motor.
(3) Fault diagnosis and recording function
During the operation of electric motors in petrochemical production sites, a motor protector is required to detect the motor, determine its normal, overload, short circuit, phase loss, overvoltage, undervoltage, overheating, and other working conditions, and take corresponding measures. When a certain fault occurs in the motor, the protector cuts off the power supply of the motor and is in a protective state, saving the fault type, time, and motor operating parameters. The motor protector identifies, remembers, and indicates the fault through the recognition and memory circuit for easy maintenance. Only after the fault is eliminated, the protector is reset, and the fault indicator light disappears to ensure that the motor can be restarted.
With the continuous development of contemporary control technology, electric motors have become an important part of control systems, and motor protectors are also developing towards diversification. Therefore, we need to fully consider the actual needs of motor protection, accurately and timely judge motor faults, reasonably choose protection functions and methods, achieve good protection of motors, improve equipment operation reliability, reduce unplanned parking, and reduce accident losses. Motor protectors are important components of power generation, power supply, and consumption systems. The widespread use of motor protectors can not only improve the accuracy and scientificity of process control, reduce failure rates, but also play a positive role in improving the automation level of electrical control systems and developing the national economy.
