Technical parameters of the Axpert-Hivert General Medium Voltage Drive

VFD rated power	250...12500 kW / 315...16000 kVA*
Rated voltage	3.3 kV / 4.16 kV / 6.6 kV / 11 kV (-20...+15 %)*
Rated frequency	50 Hz / 60 Hz (-10...+10 %)*
Modulation technique	SVPWM
Control power	415 VAC, 1...5 kVA (depend on power rating)
Input power factor	> 0.96
Efficiency	> 0.96, for variable frequency inverter > 98 %
Output frequency range	0...80 Hz *
Frequency resolution	0.01 Hz / 0.002 Hz
Instantaneous over-current protection	150 % protect immediately (can be customized)
Overload capability	120 % for 2 minutes
Current limited protection	10...150 % (1000 ms...3 S inverse time protection)
Analog inputs	Three ways 4...20 mA / 2...10 V
Analog outputs	Four ways 4...20 mA (two ways fixed, two ways optional)
Host communications	Isolated RS-485 interface, ModBus RTU, Profibus DP (optional), Industry Ethernet Protocol (optional)
Accelerating / decelerating time	5...1600 Sec (set according to the application / load)
Inputs & outputs switch signals	14 inputs / 22 outputs
Environment temperature	-5...45 °C *
Storage/transportation temperature	-40...70 °C *
Cooling methods	Forced air cooling
Environment humidity	<95 %, no condensation *
Installing altitude	<1000 meter, when altitude is higher than 1000 meter, each 100 meter increasing needs 1 % derating of VFD
Dust	Non-conductive, no causticity, <6.5 mg/dm3 *
Protection level	IP 30 *
Cabinet colors	RAL 7032 (can be customized)

• *Please consult Amtech for the information beyond the above table
• Specification are subject to change without notice.

Axpert-Hivert Medium Voltage Drive Specifications

Features

The Axpert-Hivert General Medium Voltage Drive supplied by Amtech is equipment for use with high voltage (synchronous or asynchronous) AC motor speed adjusting and driving. It has the following functions and features:

• Self-innovated SVPWM control strategy has advantages of high control accuracy, fast response, and greater than 98 % VFD efficiency
• Modular design of power cell, convenient to maintain
• Wide input voltage scope meets the demand of power network
• Power cells connecting in series topology and wave stacking method, well developed technique and reliable devices
• AVR (automatic voltage regulator) function of output voltage prevents damage to motor isolation from over-voltage and reduces motor loss without load
• Torque boost function, raises output voltage & output torque during low frequency running
• Rotating speed (fly) start function, realizes the motor restart during rotating, meets continuous production requirement
• Transient power loss function, inverse charging to ensure normal running when the network loss power in a very short time
• Auto-start function of high voltage trip, suitable for working condition like dual power switch and voltage trip
• Synchronizing switch function (optional), realize "no disturb" motor switch between network and variable frequency, reduces the impact to equipment and network
• Power cell by-pass function (optional), automatically by-passes the fail cell without influencing the VFD operation
• English HMI easy for operation

Besides above advantages, the Axpert-Hivert General Medium Voltage Drive has the following functions and features:

• Protection of overload and over-current
• Protection of phase-loss
• Protection of overvoltage
• Overheat protection
• Current limit function
• Interlock protection of control power supply
• Two sets of control power hot standby for redundancy
• Power cell communicate with controller through optic fiber, complete electric isolation.
• System running in closed-loop, can use the expected value of field controlled parameter (such as pressure, flow, temperature etc.) set by the user to adjust the motor rotating speed automatically. For instance: constant pressure water supply system can realize the control of water supply volume by pressure
• Multiple communication methods with host computer, isolated RS-485 interface, standard MODBUS-RTU communication protocol, PROFIBUS-DP (optional), industrial Ethernet communication protocol (optional)
• Accurately fault records, can inquiry information and locate fault
• Cabinet door opening alarm function
• Compact construction, reasonable layout (can do customer-design)

The power supply input and output of Axpert-Hivert General Medium Voltage Drive meets the most stringent IEEE 519-2014 and GB/T14549-1993, no need of independent input filter, the cost for harmonic elimination is saved for customers.

Because of the high power factor of the system, the compensation device for power factor is not needed, thus the reactive input and the input capacity are reduced, and the cost for capacity increasing of power network is minimized.

High Quality Power Input

Using an isolated transformer, the input of Axpert-Hivert General Medium Voltage Drive could be isolated to grid. By phase shifting of the secondary winding and multi-pulse diode rectifier, isolated powers can be acquired and supplied for power cells (18 pulse for 3.3kV, 30/36 pulse for 6.6kV, 54 pulse for 11kV series). By using the technique of multi-pulse rectifier, the harmonic current could be eliminated greatly.

In Fig. 1, the harmonic distortion of 6-pulse VFD total current is 25 %, and the harmonic distortion of voltage is 10 %; the total harmonic distortion of 12-pulse VFD input current is 5.9 %, and the harmonic distortion of voltage is 3.3 %; for the Axpert-Hivert General Medium Voltage Drive, the harmonic distortion of 30-pulse total current in the case of typical power impedance is 1.00 % only; the corresponding voltage distortion is 1.00 % only.

Features of Nearly Perfect Power Output

The technique of power cell series connecting (namely multiple power cell structure) applied in Axpert-Hivert Medium Voltage Drive greatly eliminates the output harmonic content; the output waveform is almost a perfect sine waveform (see Figure 2 and 3). Compared with other high voltage and high power VFDs, it has the following advantages:

• No need of extra output filtering device
• Protection of phase-loss
• Directly driving the general high voltage synchronous or asynchronous motor, and the temperature of the motor will not be increased
• No need of motor derating operation
• If you are looking for Synchronous drive then Amtech electronics provides synchronous drive.
• No dv/dt damage to insulation of motor and cable
• No torque ripple induced by harmonics, and the service life of motors and mechanism devices can be extended
• No cable length limited when voltage drop is in the allowable range

Applicable standards and norms

Standards Number	Standards Description
GB 156-2007	Standard voltages
GB/T 1980-2005	Standard frequencies
GB/T 2423.10-1995	Electric and electronic products -- Basic environmental test regulations for electricians -- Guidelines for vibration (sine)
GB/T 2681-81	Colors of insulated conductors used in electrical assembly devices
GB 4588.1-1996	Specification for single and double sided printed boards with plain holes
GB 4588.2-1996	Sectional specification: Single and double sided printed boards with plated-through holes
GB 7678-87	Semiconductor self-commutated converters
GB 10233-88	Basic test method for electric-driving control gear assemblies
GB 12668-90	General specification for speed control assembly with semiconductor adjustable frequency for AC motor
GB/T 15139-94	General technical standard for electrical equipment structure
GB/ 13422-92	Power semiconductor converters -- Electrical test methods
GB/T 14549-93	Quality of electric energy supply harmonics in public supply network
IEEE 519-1992	Practices and requirements for harmonic control in electrical power systems
GB/T 12668.4-2006	Adjustable speed electrical power drive systems, Part-4: General requirements. Rating specifications for AC power drive systems above 1000 VAC and not exceeding 35 kV
GB 3797-2005	Electric-driving control gear, Part-2: Electric-driving control gear incorporating electronic devices
GB/T 2900.18-2008	Electro-technical terminology -- Low voltage apparatus (equivalent IEC 60050-441:1984)
GB/T 3859.1-1993	Semiconductor converters. Specification of basic requirements (equivalent IEC 60146-1-1:1991)
Storage/transportation temperature	Semiconductor converters. Application guide (equivalent IEC 60146-1-2:1991)
GB/T 3859.3-1993	Semiconductor converters. Transformers and reactors (equivalent IEC 60146-1-3:1991)
GB 4208-2008	Degrees of protection provided by enclosures (IP Code) (equivalent IEC 60529:1989)
GB/T 16935.1-2008	Insulation coordination for equipment within low-voltage systems - Part-1: Principles, requirements and tests (equivalent IEC 60664-1:1992)
IEC 60038:1983	IEC Standard voltages
IEC 60050-151:2001	International electro-technical vocabulary, 151: electrical and magnetic devices.
IEC 60050-551:1999	International Electro-technical Vocabulary, 551: Power electronics.
IEC 60076	Electric power transformer
IEC 60721-3-1:1997	Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities, storage.
IEC 60721-3-2:1997	Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities.
IEC 60721-3-3:2008	Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities. Stationary use at weather protected locations.
IEC 61000-2-4:2002	Electromagnetic compatibility (EMC) Part-2: Environment Compatibility levels in industrial equipments for low-frequency conducted disturbances.
IEC 61000-4-7:2002	Electromagnetic compatibility (EMC) Part-4: Testing and measurement techniques chapter 7. General guide on harmonics and inter-harmonics measurements and instrumentation, for power supply systems and equipment connected thereto.
IEC 61800-3:2004	Adjustable speed electrical power dive systems, Part-3: product standard including specific test methods.
IEC 60757:1983	Identification of insulated and bare conductors by colors.
IEC 106:1989	Environment condition guides for specifying performance rating of equipment.
DL/T 994:2006	Power station fan and water pump Medium Voltage Drive.