Yes, it is recommended that you use Suokeng Heping high-voltage solid-state soft starter, which has been operating safely and without fault at the Three Gorges Xiluodu Hydropower Station for four consecutive years.
The soft starter is a novel motor control device that integrates motor soft starting, soft parking, light load energy saving and multiple protection functions. It is called Soft Starter abroad. Its main components are three-phase parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different functions can be achieved by using different methods to control the conduction angle of the three-phase parallel thyristor so that the input voltage of the controlled motor changes according to different requirements. At present, the most famous soft starter in the world is Solcom&hapn (). Solcom&hapn (Shanghai) Electric was rated as a well-known trademark in China. Solcom&hapn (Shanghai) Electric was the first to use the term soft starter in China.
Especially the HPMV-DN series medium and high voltage solid-state soft starters are particularly famous, and hapn is a well-known trademark in China. The voltage is 1KV~15KV, the power is 160KW~15000KW, and it has obtained more than 20 patents. In 2005, it successfully developed the first domestic high-voltage solid-state soft starter device, which was successfully used in the Three Gorges Xiluodu Hydropower Station, Beijing Olympic Project, Shanghai World Expo, Guangzhou Baiyun Airport, Pan Steel, Daqing Petroleum, Shanghai Metro and other national large-scale engineering projects.
With the rapid growth of our country's economy and the rapid advancement of science and technology, intelligent control systems have been increasingly widely used, and higher requirements have also been put forward. As an important driving actuator, the motor's control method has received great attention from technicians. It not only lays a good foundation for intelligent control, but also reduces the impact on the power grid when the motor starts. Therefore, the huge industry of electric motor starting equipment is quietly emerging in China. In order to adapt to the rapidly expanding market and customer base, help more units and individuals to quickly become familiar with the localization of soft starters, and clearly understand the technology, performance, and quality of domestic soft starters, here is an introduction to representative domestic soft starter products. Home: A brief description of the HPMV medium and high voltage motor soft starter produced by China Heping Electric Co., Ltd.
Company Profile
China Heping Electric Co., Ltd. was founded in 1991. It is now a national non-regional company in the electrical industry and has a production base in Shanghai: Soken (Shanghai) Industrial Control COMPLETE EQUIPMENT LIMITED. The company has Heping Electrical Science Research Institute within the company, with a total of 800 employees and 110 technical engineers (including 35 senior engineer doctoral students). The total plant area is 22,400 square meters, with an annual output value of 420 million yuan. . The company integrates scientific research, production, trade and IT industry, with intelligent soft starters and cabinets as the leader, and low-voltage electrical appliances and other related industries as the auxiliary. Its products include high, medium and low-voltage electrical appliances and power transmission and distribution equipment. The company takes "high technology, high quality, and excellent service" as its development policy, and fully implements ISO9000 quality system and ISO1400 environmental protection system management. With remarkable performance over the years, it has provided the best and most practical products for rural power grid transformation, industrial technology transformation, project construction, etc. The company's high-tech products have received awards from the city and province, and have been included in the National Torch Plan.
Introduction to HPMV-DN high-voltage soft starter
The most commonly used in today's transmission engineering is the three-phase AC induction motor. In many cases, these motors are connected directly to the power supply system due to their starting characteristics. If started directly online, a surge current of up to 6 times the rated current of the motor will be generated. This current can overload the supply system and series-connected switchgear. If it is started directly, a high peak torque will also be generated. This impact will not only impact the drive motor, but also damage the mechanical device. For example: auxiliary power transmission section (V-belt, gear). In order to reduce the direct current, starting auxiliary devices should be used, such as starting reactors or autotransformers. However, conventional methods such as starting with reactors or autotransformers can only gradually reduce the voltage, while soft starters can smoothly increase the terminal voltage by Voltage, impact-free starting can be achieved. As a result, the power supply system as well as the motor can be optimally protected.
HPMV medium and high voltage soft starters are made of multiple thyristors connected in series and parallel, which can meet different current and voltage requirements. By controlling the firing angle of the thyristors, the output voltage can be controlled.
When the motor is starting, HPMV increases the terminal voltage of the motor according to the preset starting curve to smoothly accelerate the motor, thereby reducing the electrical and mechanical impact on the power grid, the motor itself, and connected equipment when the motor starts. When the motor reaches normal speed, the bypass contactor is turned on. After the motor is started, the HPMV soft starter continues to monitor the motor and provide various fault protections. During soft stop, the terminal voltage of the motor is first smoothly reduced according to the preset shutdown curve until the motor stops. Soft stop can solve related problems such as water hammer phenomenon and mechanical impact of water pump caused by sudden shutdown.
The operation process of HPMV medium and high soft starters can be divided into four processes: completion of starting preparation, starting process, operation and shutdown process. The CPU provides comprehensive protection for all processes.
A. Start preparation is completed: During this process, control and power have been added to the starter, and its protection includes SCR short circuit, bypass clutch, and contact melting short circuit.
Other detection and protection features:
Soft starter temperature rise
Whether the fuse indicator light is on
Whether the phase sequence is correct (if selected )
Power input frequency trip range
External input fault
B. Starting process: When the soft starter gets a starting command, the following protection functions start to work ：
Starting curve
Acceleration time
Phase-to-phase balance
Circuit short circuit/detection before adding load
Phase-to-phase Leakage
Starting current accumulation
Overload detection
Thermal capacity detection
C. Operation process: When the motor is running at full voltage and speed, The motor current will drop below FLA, and the following protection functions will take effect during operation:
Operating overload curve
Lack of phase
Current too low/loss of load< /p>
Overcurrent/electronic positioning pin detection
D. Shutdown process: Once the soft starter receives a shutdown command, different protection functions should be selected according to different shutdown methods. The selections are as follows:
p>Soft stop mode: All protection features during operation will be maintained. At the end of the stop, enter the lower coasting stop protection state.
Coasting stop mode: The power is immediately disconnected from the motor and restored to "starting preparation completed", and the following protection functions take effect:
Coasting deceleration/rotation deceleration count
< p>Number of starts per hourStarting interval
Working principle
1. Structure
Complete HPMV series soft starter It is a standard motor starting controller used to protect and control medium and high voltage AC motors. The complete HPMV includes: isolation switch, fuse, main vacuum contactor, control transformer, control module, thyristor module, and high-voltage vacuum bypass contactor. The soft start part only includes: control module, thyristor module, and high-voltage vacuum bypass contactor.
A. Isolating switch: The input power part of the starter is equipped with an isolating switch that allows the motor to be started directly with load. This isolating switch has the overload capability of starting when the load is short-circuited and shutting down with the load. Its maximum design value is: 5KV isolation switch uses 2300-4160V starter, 7.2KV is used for 6000-7200V starter, and 15KV is used for 10-14KV soft starter.
When the isolating switch is closed, the door of the high-voltage component part of the control cabinet cannot be opened. The isolating switch has an interlocking device, and the cabinet door can only be opened when the isolating switch cuts off the power supply. In the same situation, the isolating switch cannot be closed when the cabinet is opened. The mechanical interlocking device on the isolating switch effectively interlocks the medium voltage power supply to ensure safe operation.
There is a visual window installed in the medium and high voltage input power supply part of the control. You can observe whether the clutch switch blade is in the separated or closed state without opening the cabinet door. When the isolating switch is in the disconnected state there is a separate blade arm mechanically connected to ground (optional for 14KV).
B. Power fuse: For standard controllers, a fuse is installed in each phase of the input power supply to limit the primary power supply current.
Typical fuses below 6900V are ANSI standard R type, while 10-15KV controllers use ANSI standard E type fuses. The selection of fuse is based on the motor's stall current and the corresponding solid-state starter's overload relay. Fuses and overload protection are designed to protect against lower and medium level faults. This prevents overload current from exceeding the relay rating, providing effective protection against higher faults that exceed the relay's protection range.
The fuse holder is equipped with a fuse indicator (wired to the insulated clutch control circuit). When the fuse of one of the three phases is open, all three-phase power will be automatically disconnected.
C. SCR power device: In each phase, a pair of SCRs with the same parameters are installed in parallel in anti-phase. In order to meet the peak voltage requirements of all used grids. Connect the SCRs in series. The number of series connections is such as ①400A, 2 pairs of SCRs connected in series with voltage 3300V, the total number of SCRs is 12, ②600A, 6 pairs of SCRs connected in series with voltage 6000V, the total number of SCRs is 36
D. RC absorption network : RC absorption network provides instant voltage protection circuit to reduce dv/dt surge voltage. Prevent damage to the SCR module.
E. Trigger circuit: SCR uses a continuous pulse trigger circuit, which is isolated by optical fiber and pulse transformer.
F. Main vacuum contactor: The main vacuum contactor is used to cut off the main power supply and SCR circuit. Its voltage ratio is: 5KV for 2300-4160V, 7.2KV for 6000-7200V, 15KV For 10-15KV soft starter.
Apply to contactors under sequential control. Under normal use conditions, ensure that the number of starts can reach the designed service life under non-load conditions. The main vacuum contactor is designed at maximum starting ratio and the bypass contactor is designed at emergency starting ratio. The 10-15KV 600A starter uses a vacuum pull-out contactor with a capacity of 15KV 600A. This control has two indicator lights, three current timers, current overcurrent relay, and has a capacitive type device. The bypass contactor unit also has two indicator lights and a capacitive trip element.
2. Electronic control system
The HPMV series electronic control circuit is divided into two parts: low voltage and medium and high voltage, and are isolated into two independent parts. The low-voltage electronic part includes the control interface and interface. The CPU and main power board are installed in the low-voltage control room.
A. CPU main control board: The CPU board is equipped with a microprocessor and a communication processor. The CPU determines various operating functions and controls them according to the user's setting program and detection feedback signals. The CPU main board is equipped with There are EPROM, EEPROM and DRAM registers, as well as analog and digital interfaces.
B. Main power board: Also called the main trigger board, it includes digital input and output relays and interfaces, and is connected to the TCB board. It controls the action sequence of the bypass isolation contactor and the triggering of the SCR. , this board generates all trigger signals and receives feedback signals from optical fiber isolation, converting analog signals into digital signals for the CPU. These trigger pulses also use optical fibers to isolate medium and high-voltage environments.
C. Voltage, electronic control part: The medium and high voltage main power supply should be disconnected before the TCB, trigger driver and TEMP/CT control board work.
D. TCB (Terminal and Control Board) terminal control board is the user’s wiring board. In order to meet the UL safety standards, it is located in the medium voltage part, but it is not actually connected to the medium voltage part, but only contacts the There are connections for the control coil of the controller. This board contains the user wiring terminal strip, the output relay (all identical) input and control power wiring, and includes the time relay for the power factor adjustment relay and other external components.
E. Trigger driver board: Located on the SCR module assembly, these boards communicate with the main power board through optical fiber, and the trigger pulse signal is amplified through the pulse transformer to trigger the SCR. In each SCR module Each pair of SCRs uses a trigger driver circuit board.
F. TEMP/CT: The temperature control board and current transformer board are installed on the SCR module assembly, and the radiator temperature and current signals are sent to the main power board through optical fibers.
3. Principle
The control core of HPMV is the microprocessor CPU. This microprocessor control system starts and protects the motor. The CPU performs phase angle trigger control on the SCR to reduce the voltage applied to the motor, and then slowly controls the voltage and current applied to the motor to smoothly increase the motor torque until the motor accelerates to full speed. This starting method can reduce the starting impulse current of the motor and reduce the impact on the power grid and the motor itself. At the same time, it also reduces the mechanical impact of the mechanical load device coupled to the motor to extend the service life of the equipment and reduce faults and downtime for maintenance.
A. Acceleration mode: HPMV provides several acceleration modes. You can choose the most appropriate starting curve according to the load condition of the induction motor.
The factory setting is a voltage ramp with current limiting function, which is also the most reliable starting mode and can meet most applications. The initial torque is set to a value when the motor can just drive the load to rotate, and then the voltage gradually and smoothly rises, making the motor smoothly run at full speed within the limited ramp time and motor starting current range. Analysis of the following three starting states:
a. If the motor reaches full speed before the end of the soft starting ramp, the automatic anti-oscillation circuit will automatically add full voltage to the motor so that the ramp time will no longer start. effect. It prevents any surge current or motor torque pulsation. This situation may usually occur when the load is not applied to the motor and the motor is operating at reduced pressure and low torque during motor starting.
b. If the motor does not reach full speed before the end of the ramp time, the current limit setting will control the maximum output torque proportionally.
HPMV’s feedback sensor will Automatically prevent the motor from overloading and stalling or failing to exceed the acceleration setting time.
c. The current limiting function provides an effective means and control method for the motor to draw a certain amount of current from the power grid or generator. When the starting torque of the motor reaches the torque corresponding to the limited starting current value After that, the torque and current will be automatically maintained, and the current limit value will not be affected by the set ramp time until the motor reaches full speed. When the motor reaches full-speed operation, the motor current drops to the normal full-speed operation current value. The HPMVK medium and high-voltage soft starter has a full-speed operation status output relay, which closes the bypass high-voltage vacuum contactor and causes the motor current to contact through the bypass. device, thereby preventing heat loss caused by the voltage drop caused by SCR conduction, improving work efficiency and reliability. MPMV works under full voltage. Just like other starters, after the motor is soft-started, the grid voltage is directly added to the motor. However, what is better than other starting methods is that HPMV has a full electronic protection function, and its sensitivity and sensitivity The fault protection response speed is calculated in milliseconds, which is unmatched by conventional motor starters and protectors.
B. Other starting methods of HPMV medium and high-voltage soft starters:
Current ramp: PID adjustment can be performed using current closed-loop feedback to linearly increase the output torque to the maximum value.
Constant current control: When starting, the current quickly increases to the limit value until the motor runs at full speed.
User-defined curve: The user can customize a starting curve of torque and time. When the motor starts, it can accelerate exactly according to the curve you defined.
Speed ??feedback ramp control: Use a speed signal from the motor or load as the feedback quantity to perform a closed-loop ramp soft stop on the motor. (Option)
Deceleration mode: HPMV provides soft stop function. When the stop signal is sent, a gradually decreasing voltage is added to the motor to stop the motor smoothly. This is different from electric braking. In fact, soft stop It will increase the parking time of the motor. This function is suitable for water pump shutdown control to reduce water hammer and damage and impact to the mechanical structure.
4. Trigger circuit
The thyristor trigger circuit is a key part of the stability and reliability of the system. The HPMV trigger circuit includes several unique advantages. It is resistant to noise interference and can work in harsh environments. Working environment and long service life, it is not affected by line impedance, short-circuit capacity, or rapid switching of switches during on-site installation. These characteristics include:
A. Automatically synchronized trigger pulse and The conduction angle of each phase is guaranteed to have the same triggering point to avoid false triggering. This feature is suitable for small factory-prepared generator equipment. The MVC PLUS series can be used with confidence in power supplies with large fluctuations and instability.
B. The stable and reliable trigger pulse signal can reliably conduct the thyristor within a conduction angle range of 270 degrees and is not affected by noise signals to ensure that no false triggering occurs.
C. The closed-loop trigger control method performs smooth soft starting based on output current and voltage feedback to prevent motor overheating due to phase imbalance during starting.
D. The trigger signal is isolated with a pulse transformer. A specially designed three-phase 120V low-voltage control power transformer is used to ensure that the detection, trigger board and noise and interference from the input medium-voltage power supply are isolated, using high insulation properties. The 28VAC power supply supplies the pulse trigger circuit, and a separate control power transformer is magnetically isolated for all low voltage circuits and the CPU.
E. Optical fiber isolation is used between medium voltage power supply and all low voltage systems. The signals isolated by CT are then isolated by optical fiber to achieve maximum isolation and ensure safety
Model description
(1) Rated current of starter: 60, 110, 200, 320, 400, 600, 800A
(2) Main voltage
Nominal value
2.3kV
3.3kV
4.16kV
6.0kV
6.6kV
p>
10kV
13.8kV applicable scope
2.3kV+10%-15%
3.3kV+10%-15%
4.16kV+10%-15%
6.0kV+10%-15%
6.6kV+10%-15%
10kV +10%-15%
13.8kV+10%-15%
(3) Control voltage
Nominal value
110VAC
220VAC
110VDC
220VDC
Applicable scope
100~120VAC
200~240VAC
100~120VDC
200~240VDC
(4)Option function
Can be selected at one time
Choose one or more functions
For example: 1+3
(Communication + Analog output
Analog output)
p>
Codename
1
2
3
4
5 Function Introduction
p>RS485 communication interface MODBUS protocol
RS485 communication interface PROFIBUS protocol
Analog output function
With motor differential protector
< p>For multi-motor drive controllerNote:
* Using a small low-voltage motor (3 to 10kw) instead of the original high-voltage motor can make a soft starter
Full functional testing.
Selection guide
Maximum rated value of motor power (KW) Soft starter specifications and models
2.3kV 3.3kV 4.16kV 6.0kV 6.6kV 10kV 13.8 kV Main current Main voltage control voltage option
160 250 340 590 650 1110 1400 HPMV-DN 60 - x - x - x+x..
315 460 650 1200 1350 2230 2800 HPMV-DN 110 - x - x - x+x..
590 860 1200 2200 2500 3980 5000 HPMV-DN 200 - x - x - x+x..
960 1350 2000 2700 3000 4780 6000 HPMV-DN 320 - x - x - x+x..
1200 1750 2500 3600 4000 HPMV-DN 400 - x - x - x+x..
1800 2550 3750 4500 HPMV-DN 600 - x - x - x+x..
2400 3450 5000 HPMV-DN 800 - x - x - x+x..
< p>Performance parameters● Main technical indicators
Load type: three-phase asynchronous or synchronous motor
Working voltage: 2.3-13.8KV
< p>Power range: 160-6000KWHeavy-duty type operates continuously at 115% load, overload 500% 1-10 seconds, 850% 0.5-5 seconds digital microprocessor control, LCD display, starting overload and Two-level protection for operating overload, optical fiber isolation between low-voltage control unit and high-voltage part, mechanical and electronic safety interlocking device, MCC wiring strip (electromechanical control center wiring strip). Auxiliary relay: multi-channel C-type dry relay 5A 240V AC programmable relay output, various data statistics during operation.
Ambient temperature: 0-50℃
Altitude: 0-1000 meters
Relative humidity: 5-95%
● Adjustable parameters
Adjustable full load current of the motor
Dual ramp adjustment—two independent set points
Initial voltage: 10-50% of line Voltage
Current limit: 100-400% of the rated current of the motor
Acceleration time: 1-30 seconds (can be extended to 90 seconds)
Soft stop Time: 1-30 seconds (can be extended to 90 seconds)
Four types of water pump control curves
Speed ??closed-loop soft start control
Pulse conflict jump start: 0.1 -1.0 seconds (80% line voltage)
Locked number of starts per hour: 1-4 times
● Communication interface and protocol
RS485-Modbus, RS485 -Profibus
● International certification
Based on domestic CCC certification and European CE certification
Main features
1. Free of charge Maintenance
Thyristor is a non-contact electronic device. Unlike other types of products that require regular maintenance of conductive liquids and components, the mechanical life is converted into the service life of electronic components, and it does not require continuous operation for several years. Downtime for maintenance.
2. Easy to install and use
HPMV-DN is a complete motor starting control and protection system. During installation, you only need to connect the power cord and motor cord to put it into operation. Low voltage is allowed to be used for mechanical and electrical testing of the entire system before operation at high voltage. HPMV-DN has the functions of self-detection, self-learning and automatic setting of starting parameters.
3. Backup Features
The cabinet is equipped with a vacuum contactor that can directly start the motor. If the HPMV-DN control system fails, the vacuum contactor can be used to directly start the motor to ensure Continuity of production.
IV. Protection and monitoring
With self-test program
SCR short circuit protection
Electronic overload protection and alarm
Short circuit protection Overvoltage protection Undervoltage protection
Overload protection Underload protection Phase loss protection
Phase sequence protection Overheating protection Stalled rotor protection
Frequency Protective ground leakage protection Current unbalance protection
Motor temperature protection Power factor monitoring Repeated starting time limit
Installation dimensions
None
Note: 1. The dimensions noted are expressed in the form of length×width×height and length×width
2. Please see the data sample for specific styles and dimensions