Zhejiang Nengrong Electric Power Equipment Co.,Ltd. was established in 2007 (formerly known as Yueqing Zhongrong Power Compensation Equipment Co., Ltd.). It is a high-tech enterprise that provides power system power quality monitoring and control, reactive power compensation, harmonic control, and power safety protection equipment as its core business. Since its establishment, we have always adhered to the concept of "energy conservation creates value, protection builds harmony" and are committed to providing high-quality products and comprehensive solutions for users in various fields to improve power quality, optimize control, save energy and reduce consumption, and protect power grid safety.
Why Choose Us
World-wide expertise
We know international markets and trends. Our expertise, experience and network cover all corners of the world.
Commitment to quality
We're committed to quality and concrete actions. That means we always deliver solutions in a professional and practical way.
Timely communication
We deliver a steady flow of updates combined with mindfully responsive answers to client questions. Our goal is to preempt the ask.
Production market
The main overseas markets for sales are Southeast Asian countries, developing countries such as Africa and South America. We currently have agents in Uzbekistan, Vietnam, and Thailand.
The NRROV series high-voltage solid-state soft starting device is truly a game-changer in the field of motor control. With this innovative equipment, starting and stopping motors has become a much more streamlined and effective process. It's a great example of how technology can be harnessed to make a real difference in the industrial sector.
Three phase soft starter Three phase 50Hz, rated voltage 0.4KV, 3KV, 6KV, 10KV, rated power 100-30000KW squirrel cage asynchronous (synchronous) motor for various loads.
The NRROV series high-voltage solid-state soft starting device is a remarkable innovation in the world of motor control. This device has revolutionized the way motors are started and stopped, making the process much smoother and more efficient. It is an excellent example of how modern technology can be utilized to improve industrial processes.
The NRROV series high-voltage solid-state soft starting device is a highly advanced and innovative device designed for efficient motor control. It is specially designed to ensure a smooth and seamless starting and stopping of squirrel cage asynchronous and synchronous motors.
The NRROV series high-voltage solid-state soft starting device (hereinafter referred to as the soft starting device) is a high-voltage motor soft starting device designed with the latest concept, mainly suitable for the control and protection of starting and stopping squirrel cage asynchronous and synchronous motors.
The NRRQV series high-voltage solid-state soft start starter device (hereinafter referred to as the soft start device) is a soft start device of the high-voltage motor designed with the latest concept, which is mainly suitable for the start-stop control and protection of the rat cage asynchronous motor and the synchronous motor.
Soft starters are an innovative solution for industries looking to optimize their motor-driven equipment. These sophisticated starters are engineered to deliver precise control over motor acceleration and deceleration, ensuring smooth and efficient operation while minimizing wear and tear on the machine.
MV soft starter have become an indispensable part of various industries across the world. The main purpose of a three-phase soft starter is to provide an efficient and reliable start to the motor by reducing the voltage applied to it while starting. The soft starter helps in minimizing the inrush current that can damage the motor and other electrical equipment.
Electric motor soft start In urban power grid substations with high fire protection requirements such as petroleum, electromagnetic interference requirements and limited installation site, when the AC asynchronous motor is started under the rated voltage, the initial starting current is too large, which often exceeds many times (generally 5-8 times) of the rated current.
A soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the powertrain and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network, extending the lifespan of the system. It can consist of mechanical or electrical devices, or a combination of both. Mechanical soft starters include clutches and several types of couplings using a fluid, magnetic forces, or steel shot to transmit torque, similar to other forms of torque limiter. Electrical soft starters can be any control system that reduces the torque by temporarily reducing the voltage or current input, or a device that temporarily alters how the motor is connected in the electric circuit.
Energy Cost Reduction (Peak Demand Charges)
When AC motors start directly at full voltage, the starting current will be up to 8 times of its rated current. When using a Soft Starter, the starting current of the motor is only 2 to 3 times that of its rated current.
Improved Power Factor
Soft Starters facilitate power factor correction as a inbuilt feature which improves the Power Factor at all load cycles (and thereby reducing the kVA). When the motor is operating at less than full load, the relative reactive component of current drawn by the motor is redundantly excessive due to magnetising and associated losses. The voltage dependent losses are thus negligible with the load proportional active current component and as a result the power factor also improves side-by-side.
Improved Operating Efficiency
Soft Starters enhances motor starting duty by reducing the temperature rise in the stator windings and supply transformer which allows for an increased number of starts per hour (reduced heating of the motors). Soft Starters also allow for easy adjustment of start-up performance (current limit) to suit the specific motor and load (smooth, adjustable acceleration time without the torque/voltage/current transients). It also provides reliable performance if the load characteristics vary between starts (eg. loaded or unloaded starts).
Reduced Power Surges
For a motor with a relatively large capacity, the starting current (without a Soft Starter) will cause a sharp drop in the grid voltage and thus affecting the normal operation of other equipment in the power grid. Using a Soft Starter, the voltage fluctuation of the power grid is generally less than 10% (only slightly affects other equipment), thus reducing the burden on the electrical system, equipment, and electrical devices throughout the system.
Reduced Torque Transients
As a result of increased loads (due to sudden changes in the direction or magnitude of the torque load), reduced torque transients could significantly decrease the lifespan of a motor. Using a Soft Starter reduces the torque load significantly during start-up and limits the associated problems.
Increased life of Contactors
A common issue associated with running an AC motor without a Soft Starter is the need to regularly replace contactors. Using a Soft Starter will reduce or even eliminate the need to replace contactors. It can also reduce the noise associated with contactors during the operation of the motor.
Types of Soft Start Starter
Primary Resistor
Primary resistors are one of the original soft starters, introduced in the early 1900s. As the name suggests, resistors are involved, one for each of the three current phases. When in place, the resistors resist the current flow during motor start-up, providing a drop in voltage. Once the motor accelerates to the pre-determined point, a timer closes the sets of contacts to remove the resistors from the circuit, allowing full power to the motor.
Autotransformer
Autotransformers are one of the most effective soft-starting methods. When the starting current is drawn from the line and must be held to a minimum but maximum starting torque per line amp is necessary, autotransformers are preferred over primary resistors. Rather than relying on resistors, this motor starter utilizes taps on the transformer windings with built-in flexibility to control the power input to the motor. By activating any one of the three taps on the windings, different amounts of current are sent to the motor. Autotransformers are a great power supply that provides current to the motor while keeping voltage low.
Part Winding
With the part winding method of soft starter, the motor windings must be divided into two or more separate sets intended for parallel operation. During start-up, power is only applied to one set of windings, but as the motor reaches speed, power is applied to the other set to resume normal running. Windings that are energized this way produce a reduced starting current and torque. Part winding also minimizes voltage drop and excessive heat during start-up.
Wye-Delta
A Wye-Delta soft starter can only be used in motors that have connection points to each of the three coil windings, specially wound with six leads for both Delta and Wye connections.The Wye configuration - named such because of its "Y" shape - results in a connection of line voltage that is applied to an electrically larger winding, helping to reduce the line current. After a pre-determined amount of time, the starter electrically switches these windings over to the Delta configuration - named for its resemblance to the Greek "delta" - during which the windings are connected normally, with every winding receiving full voltage.
What Are The Various Features of a Soft Start Starter?
Voltage Reduction
Soft starters reduce the starting current of a motor, which helps protect it and other system components from damage. This also improves performance by eliminating any sudden surges or drops in voltage.
Speed Control
Soft starters can be adjusted to limit the rotational velocity of a motor. This enables you to control the speed of your machine more precisely and achieve more consistent performance.
Protection
Soft starters contain advanced protection features that help them detect overloads, unbalanced loads and other potential issues before they cause serious damage. Many soft starters also come with built-in thermal protection mechanisms to guard against overheating.
Programming
Most modern soft starters come with programming capabilities, allowing users to easily adjust settings and customize their device for optimal performance. This includes being able to set acceleration, deceleration and ramping times, as well as limiting torque profiles, among other things.
Transistor
The transistor is the core component of the motor soft starter and mainly plays the role of controlling the current. When the motor starts, the transistor adjusts the starting current of the motor through the control circuit, thereby reducing the impact when the motor starts; when the motor is running, the transistor can monitor the operating status of the motor so that the motor is always in normal working condition.
Inductance
Inductors are mainly used for filtering and shunting. It can limit the current through impedance, thereby reducing the starting current when the motor starts.
Capacitor
Capacitors are mainly used to store charge and balance voltage. It can protect the motor by regulating the storage and release of charge and controlling the current and time when the motor starts.
Relay
The relay is the output switching device of the motor soft starter. It can start and stop the motor by controlling the motor to turn on or off the power supply.
Control module
The control module is the core control part of the motor soft starter. It can realize intelligent control of the motor by monitoring the operating status of the motor. By analyzing the actual operation of the motor, the control module can adjust the starting current and speed of the motor in a timely manner to ensure the safety and normal operation of the motor.
Soft starters have become increasingly popular due to the wide range of advantages they offer compared to other, conventional motor starters. Motor starters refer to a variety of electrical devices used to start and stop electric motors, either directly or through a switching process such as Programmable Logic Controllers (PLC). Soft starters are implemented in systems where slow-onset torque is desired, while traditional motor starters are generally used in applications that require quick, full-torque startups.
One of the main benefits of using soft starters instead of other motor starters is the amount of current it can draw from a power source. Soft starters draw far less current than standard motor starters, helping reduce energy loss and save energy costs for businesses. For example, when running a large conveyer belt system with lots of motors it might be more efficient and cost-effective to opt for several soft starters instead of one large motor starter.
The other outstanding benefit of soft starters when compared to other motor starters is the smoothness they provide in terms of motor speed control and torque accuracy. Because these devices are not just on/off equipment but instead enable gradual starting, there is far less chance for mechanical overload or damage to the driven equipment under startup or during stopping. This can further help lower operational costs associated with electrical energy consumption, size requirements for bulkier components, and reduced maintenance needs for preventing wear and tear damage.
How to Choose Soft Start Starter
Product Structure
There are three main structures of soft starters: current type, voltage type and pulse type. Among them, the current-type soft starter uses current feedback to control the starting current of the motor, the voltage-type soft starter uses voltage feedback to control the motor's speed and torque, and the pulse-type soft starter uses pulse signals to control the starting and stopping of the motor.
How To Choose Products
When choosing a soft starter, you need to choose based on actual needs. First, you need to determine the power and current of the motor to select a suitable soft starter. Secondly, it is necessary to consider the control mode of the soft starter and select current type, voltage type or pulse type according to actual needs. In addition, factors such as the soft starter's protection function and after-sales service also need to be considered.
Product Advantages
The advantage of the soft starter is that it can effectively reduce the starting current of the motor, prevent current shock, and extend the service life of the motor. At the same time, it also has a variety of protection functions, such as overload protection, short circuit protection, undervoltage protection, etc., to ensure the safe operation of the motor. In addition, the soft starter also has intelligent control and display functions to facilitate user operation and maintenance.
Scenes To Be Used
Soft starters are suitable for various scenarios that require motor start control, such as industrial production lines, power facilities, elevators, water pumps, etc. Especially in situations where it is necessary to reduce the starting current of the motor and prevent current shock, such as elevators, high-rise buildings, etc., soft starters are more suitable.
Open Control
A start voltage is applied with time, irrespective of the current drawn or the speed of the motor. For each phase, two SCRs are connected back to back and the SCRs are conducted initially at a delay of 180 degrees during the respective half-wave cycles (for which each SCR conducts). This delay is reduced gradually with time until the applied voltage ramps up to the full supply voltage. This is also known as Time Voltage Ramp System. This method is not relevant as it doesn't control the motor acceleration.
Closed-Loop Control
Any of the motor output characteristics like the current drawn or the speed is monitored and the starting voltage is modified accordingly to get the required response. The current in each phase is monitored and if it exceeds a certain set point, the time voltage ramp is halted.
The soft starter monitors the motor's electrical power level. The power monitor device is connected to the controller of the motor, which sends precisely timed pulses of current (called excitation) to the motor.The motor responds by taking in more power to accelerate and maintain speed. The greater current draw also reduces its internal resistance and causes an electromotive force greater than that which is applied by the controller, causing it to turn off. This action makes it more difficult for a subsequent overload condition to result in transients damaging sensitive electronics and components of the motor.
The soft-start activates when a setpoint voltage is within a few volts above or below the setpoint voltage set by the overload protection relay or circuit breaker. The soft starter provides a slow, gradual acceleration of the motor. This prevents the motor from over-exciting and causing damage to itself and to the system.
A soft starter uses peak-detecting current circuits to determine when an overload condition is occurring. If a motor starts suddenly, there may be enough power flowing through it so that some electrical equipment connected to the motor may not be able to handle it (electrical equipment can be damaged by power surges or spikes). If an overload situation occurs while the motor is starting quickly, there may not be enough voltage available to trigger the overload protection mechanism in time.
Temperature check: Check the temperature of the soft starter regularly to ensure that its operating temperature is within the normal range to avoid failure caused by overheating.
Power supply voltage check: Check whether the power supply voltage of the soft starter is stable to ensure its normal operation.
Status indicator light check: Check whether the status indicator light of the soft starter is working normally so that faults can be discovered in time.
Cable connection inspection: Check whether the cable connection of the soft starter is firm to avoid failure caused by looseness.
Control signal check: Check whether the control signal of the soft starter is normal and ensure that it can respond correctly to external instructions.
Cooling fan cleaning: Regularly clean the cooling fan inside the soft starter to ensure good heat dissipation.
Maintenance record update: Timely record the maintenance status of the soft starter, including maintenance date, maintenance content, etc., to facilitate subsequent maintenance and troubleshooting.
Fault alarm inspection: Check whether the fault alarm function of the soft starter is normal so that faults can be discovered and dealt with in a timely manner.
Insulation resistance test: Conduct insulation resistance test of the soft starter regularly to ensure that its insulation performance meets the requirements.
Regular maintenance: Regularly conduct comprehensive cleaning and maintenance of the soft starter, including removing dust, lubricating bearings, etc., to maintain its good working condition.
Zhejiang Nengrong Electric Power Equipment Co.,Ltd. was established in 2007 (formerly known as Yueqing Zhongrong Power Compensation Equipment Co., Ltd.). It is a high-tech enterprise that provides power system power quality monitoring and control, reactive power compensation, harmonic control, and power safety protection equipment as its core business. Since its establishment, we have always adhered to the concept of "energy conservation creates value, protection builds harmony" and are committed to providing high-quality products and comprehensive solutions for users in various fields to improve power quality, optimize control, save energy and reduce consumption, and protect power grid safety.
Factory pictures
certificate
FAQ
Q: What type of motor requires a soft starter?
Q: What are the advantages and disadvantages of using a soft starter?
Q: Is a soft start bad for air conditioner?
Q: When should you use a soft starter?
Q: Are soft starts good for AC?
Q: Why do soft starters fail?
Q: What are the 2 types of soft starters?
Q: What are the benefits of soft starters?
Q: Which is better VFD or soft starter?
Q: How do I choose a soft starter?
Q: Why every homeowner should consider installing an AC soft start?
Q: Does a soft starter reduce power consumption?
Q: Is a soft starter an inverter?
Q: What size soft starter do I need?
Q: What is the soft starter theory?
Q: Which is better soft starter or star delta starter?
Q: How many amps does a soft starter draw?
With a SoftstartRV installed, the AC Amp draw should normally be between 10 to 13 Amps (running) and 24 Amps Starting. It's understandable that generators can be big and heavy. Smaller generators typically have limitations and conditions.
Q: How soft starter improves performance?
Q: Are hard start kits bad for compressors?
Q: What is the voltage of a soft starter?
Hot Tags: 6kv/10kv/11kvSoft Start Starter, China 6kv/10kv/11kvSoft Start Starter manufacturers, suppliers, factory, power factor correction for inverters, power factor correction for copiers, power factor correction capacitor cabinet, power factor correction for network cards, power factor correction for inductors, power factor correction for solar power