Working principle of 4000KW high-voltage motor solid-state soft starting cabinet

4000KW high-voltage motor solid-state soft starter cabinet working principle of Aodong Electric ADGR/Y, ADGR control core is advanced microprocessor, through the CPU to the main loop thyristor phase shift trigger control to achieve. Increase motor torque smoothly by gradually increasing voltage and current at motor terminals. In this process, RC absorption unit not only absorbs spike voltage but also plays the role of static voltage equalization. Fiber-optic isolation thyristor and trigger unit emit strong trigger pulse to ensure dynamic voltage equalization of thyristor module. Torque can be detected online, output to the motor torque and feedback to the soft starter. Normal signals from phase, current and temperature are detected simultaneously. When the motor is close to rated speed, the soft starter sends out bypass closing command until the motor runs normally. This starting method can reduce the starting impulse current of the motor, reduce the impact on the power grid and the motor itself and the impact on the mechanical load. Extend the service life of the equipment.
2. Field equipment operating environment
3.1 Altitude:   ≤2000m 
3.2 Earthquake intensity:   8 degrees
3.3 Daily average relative humidity: no more than 95%(25℃), 50%(40℃) no condensation
3.4 Indoor ambient temperature: -10℃~+45℃* large daily temperature difference 15℃
3.5* Large daily temperature difference:    15℃
3.6 Extreme * high temperature:  40.7℃
3.7 Extreme * Low Temperature:  -20.2℃
3.7 Annual average temperature:   +18℃
3.8 Ground horizontal acceleration: 0.3g  vertical acceleration;0.15g
3. Site engineering conditions
4.1 Installation place: indoor installation, 10KV high voltage solid state soft starter cabinet installed in Germany high voltage distribution room, equipment protection level required to reach IP4X.
4.2 Installation mode: vertical independent installation.
4.2 Cable in and out mode: cable goes in and out from the bottom of high-voltage solid-state soft starter cabinet.
4.3 Neutral point grounding mode: neutral point ungrounded system.
4.4 Cable distance between high-voltage solid-state soft starter cabinet and motor (load):<150m.
4. On-site power supply mode and conditions
5.1 Power supply mode: directly fed out from switch cabinet of HV distribution room on 10KV network side
5.2 Rated capacity: 1250A
5.3 Rated voltage: 10kV
5.4* High voltage: 12kV
5.5 Rated frequency: 50Hz
5. Technical parameters of field high voltage motor
5.1 Drag mode: adopt one-by-one high-voltage solid-state soft starter
5.2 Motor type: Squirrel-cage asynchronous motor
5.3 Rated voltage: 10kV
5.4 Rated power: 4000KW (COSΦ =0.86)
5.5 Rated frequency: 50Hz
5.6 Motor wiring mode: Y
Technical Sales Hotline: 0710-3231-378 Manager Qiao
6. scope of supply
6.1 Provide the main technology and services of a complete set of thyristor (SCR) high-voltage solid-state one-drive soft starter cabinet necessary to meet the requirements of this technical annex. It mainly includes: control module, power module, control transformer, bypass, etc., among which thyristor elements adopt high-power series products.
6.2 Soft starter is supplied as a complete set of units. The cabinet adopts metal enclosed structure and the interior of the cabinet is divided. All main and control elements shall be installed in accordance with relevant national regulations and specifications to realize safe and reliable operation.
6.3 Vacuum circuit breaker is required for switching devices. Inside the soft starter device, the protection control system of each complete unit is self-contained, and the protection control components adopt PLC or microcomputer series. The complete set of units shall be equipped with one external communication interface, which shall meet the national standards. Reliable and accurate transmission
 High voltage soft starter cabinet in operation.jpgTechnical sales hotline: 0710-3231-378 Manager Qiao

8. technical requirements
8.1 The high-voltage solid-state soft starter is a one-by-one mode, with 10kV input and 10kV output. The power unit of the device is modular design, which can be easily removed and replaced from the rack. All power units can be exchanged at will. Meet the requirements of long-term continuous operation, start, run and stop quickly, safe and reliable.
8.2 High voltage solid state soft starter cabinet has soft start/straight start/soft stop function.
8.3 The incoming and outgoing wires of HV soft starter are designed to enter and exit from the bottom, and the device shall meet the requirements for the incoming and outgoing of two YJV8.7/15-3*240 cables.
8.4 Installation, commissioning and maintenance of the unit cabinet can be carried out on the front and rear.
8.5 High voltage solid-state soft starting secondary control power supply is provided by site, AC 220V-50Hz capacity is 500VA.
8.6 Control mode of high-voltage soft starting device: three-place control can be realized, ① soft starting operation ② operation of control box beside machine ③DCS centralized control.
8.7 High voltage solid state soft starter cabinet bypass contactor provides two pairs of normally open and two pairs of normally closed passive contacts.
8.8 When high voltage is not switched on, high voltage solid state soft starting cabinet can be simulated and debugged by low voltage 380V/50Hz, and various protection functions of soft starting can be realized by using low voltage motor and high power bulb simulation load, which provides starting basis for formal high voltage starting.
8.9 Installation mode of high-voltage solid-state soft starter cabinet: placed separately.
8.10 The soft start device can meet the normal starting requirements of the owner's motor, with stable starting, small impact and reliable control action.
8.11 Main parameters:
1) Starting current: squirrel-cage motor, controlled within 2.0~3.5Ie according to load assessment;
2) Single start time * Large adjustment range within 30%. * Wide range 10~60S;
3) Minimize starting pressure drop. To stabilize the quality of the grid;
4) Allowable continuous starting times: 2~3 times. However, it must meet the requirements of product temperature operation and control;
6) Soft start device has self-test (including power grid detection), acceleration correction, fault alarm and other functions.
7) Soft starter has local and remote control startup and shutdown functions, and provides I/O contacts required for motor interlocking.
9. Schematic diagram of primary scheme
9.1 A complete set of drawings shall be provided to the Buyer within one week after signing the Contract. Technical Sales Hotline: 0710-3231-378  Manager Qiao

10 Technical performance
10.1 operating principle
10.1.1.ADGR's control core is an advanced microprocessor CPU, which is realized by CPU's control of the main loop thyristor phase shift angle trigger. Increase motor torque smoothly by gradually increasing voltage and current at motor terminals. In this process, RC absorption unit not only absorbs spike voltage but also plays the role of static voltage equalization. Fiber-optic isolation thyristor and trigger unit emit strong trigger pulse to ensure dynamic voltage equalization of thyristor module. Torque can be detected online, output to the motor torque and feedback to the soft starter. Normal signals from phase, current and temperature are detected simultaneously. When the motor is close to rated speed, the soft starter sends out bypass closing command until the motor runs normally. This starting method can reduce the starting impulse current of the motor, reduce the impact on the power grid and the motor itself and the impact on the mechanical load. Extend the service life of the equipment.
10.2 soft start control mode
10.2.1. Voltage ramp start: factory set to voltage ramp with current limiting function, this is also a reliable start mode. It can meet most applications, and its initial torque is set to the value when the motor can just drive the load to rotate, and then the voltage gradually rises smoothly. Smooth motor ramp up to full speed within limited ramp time and motor starting current.
10.2.2. Current-limiting start: When starting, the current increases rapidly to the limit value until the motor runs at full speed.
10.2.3. Heavy load start: mainly used for motor drag large inertia loads such as fans, ball mills, etc., can extend the switching time of 8 seconds.
10.2.4. Free parking or soft parking option: can be applied to different parking lots-such as eliminating water hammer effect of pumps. To meet special needs.
10.3 Protection control function
10.3.1. Protection function: overcurrent, under-current protection, phase loss protection, overvoltage, under-voltage protection, thyristor short circuit protection, zero sequence protection, motor start timeout protection, start over-frequency protection, phase sequence protection, three-phase current imbalance protection, motor overload protection.
10.3.2. Control function:
1)Adopt modern advanced digital signal processing and system integration technology, excellent performance, high reliability and stability.
2) There are normal operation and fault state output signals respectively.
10.3.3 Communication function:
1)With RS485 interface (communication protocol MODBUS protocol) through this function can be directly communicated with the host PC to achieve remote control and remote signal and other functions. The number is up to 36, which realizes integrated control.
10.3.4 Power components:
1) High-power series SCR products, 5 groups of series-parallel three-phase total of 30 SCR. In this way, the overvoltage value can reach more than 2 times the rated voltage redundancy, and each group of SCR components is equipped with a separate overvoltage protection unit.
10.3.5 Memory function:
1) There are five fault history memory functions.
10.3.6. Negative feedback function:
1) Dynamic fuzzy control concept is adopted, and when the starting time is long, there will be no high voltage motor jitter phenomenon.
2）. It adopts a series of anti-interference measures and has strong electromagnetic compatibility.
Technical Sales Hotline: 0710-3231-378 Manager Qiao

10.4 Main performance indicators:
10.4Main performance indicators:

loaded species		high-voltage squirrel cage asynchronous motor
alternating voltage		10000 AC+10%-15%
isolation voltage		Line voltage 10KV/insulation voltage 42000V
overload capacity		Continuous: 120%Overload: 150%/60seconds
frequency		50HZ±0.5HZ
Main circuit composition		30-SCRS
SCRreverse peak voltage		32500V
phase sequence		ADGRallows operation in any phase sequence
transient overvoltage protection		dv/dtabsorption network
cooling method		natural cooling
bypass contactor		Vacuum contactor with direct-start device capacity
environmental conditions		Chassis temperature 0 ℃— 50 ℃ Cabinet temperature 0 ℃— 20 ℃ (-20℃— 50℃ optional heater) Altitude (below≤ 1200 m) 5%— 95%relative humidity Temperature and humidity control
approval standards		Conform to corresponding national standards
Advanced motor protection
overload reset mode		Manual (default), automatic
phase current unbalance protection		Unbalance tripping standard: 5-30% for any two phases Unbalanced trip delay: 1-20seconds
overcurrent protection		Overcurrent setting range: 100-300%FLA (valid during operation) Trip time: 1-20seconds
load phase-loss protection		Trip value: 10-90% FLA Trip time: 1-60 seconds
Overtime start protection		Trip whenstarting time exceeds 60seconds
starts per hour		Range: 1-6 stops per hour
programmable output
running indication	Start/Stop, Start/Soft Stop
acceleration parameter setting	Ramp programmable: Voltage (VR) or Current (CR) Starting voltage: 30-80%(VR) Ramp time: 1 to 100 seconds Current limit: 150-500%(CR)
deceleration parameter setting	Start deceleration voltage: 0-100% Stop voltage: 0-99% Parking time: 1-60seconds
fault display	Phase-loss, phase-to-phase imbalance trip, overload, over-temperature, over-current, loss of load, thyristor fault display
data status record
* 5 newrecords	Including the cause of the event, time, relevant data, current of each phase, time of occurrence of ground fault, etc.
Instrument detection function
motor load	percentage of full load current
current data	phase current
serial interface
communication protocol	Modbusprotocol
communication interface	RS-485
network connections	Each ADGRcan network with 36ADGR devices
function	Operation status and programming can be observed through the communication interface
operation interface
LCDdisplay	LCDdisplay
keyboard	6-key keyboard

11. Cabinet structure characteristics
11.1 Complete metal armor, assembled structure, wide combination scheme, cabinet selection of imported high quality aluminum-coated zinc sheet steel, CNC processing.
11.2 Adopt advanced multiple flanging technology, rivet nut, high strength bolt connection, with high precision, corrosion resistance, light weight, high strength, parts versatility and other characteristics,
11.3 High reliable interlocking device, fully meet” the five” requirements, each high pressure chamber has a pressure relief channel to ensure personal safety, the front door is equipped with an observation window indicator lamp, you can observe the high pressure solid soft start operation state,
11.4 Comply with GB3906, IEC298 standard, aluminum zinc steel plate parts bolted to form a shell coated aluminum zinc plate thickness of not less than 2mm, cabinet panel and rear sealing plate made of not less than 2mm cold-rolled steel plate, and requires epoxy resin powder electrostatic spraying.
11.5 Cabinet protection class: IP4X.
High voltage solid-state soft starter cabinet delivered by Aodong Electric shall fully comply with delivery test of relevant standards and specifications, and all equipment and material tests conducted in the manufacturer shall be confirmed. The Buyer's representative shall have the right to be present during certain and all tests, and the Buyer's presence during the test shall not reduce any responsibility that the Supplier shall perform. The Supplier shall provide complete test report to the Buyer. Including product factory inspection reports, certificates of conformity, factory drawings, and factory inspection reports and certificates of relevant components, the 4000KW high-voltage solid-state soft starter cabinet conducts routine factory tests in accordance with relevant industry standards and specifications to ensure that the soft starter device is free of electrical and other mechanical defects. In addition to the above tests, operation tests should be carried out to confirm the closing and tripping operations of the circuit breaker, the normal operation of the measurement system, relay protection devices and other control systems, and the working principle of the 4000KW high-voltage motor solid-state soft starter cabinet.