Laboratory
Testing Laboratory for Electromobility and Intelligent Transport
About us
The Testing Laboratory for Electromobility and Intelligent Transport (LET) offers tests of electric drive systems (motors and power systems) used both in industry and in consumer appliances. The tests also include generators used in renewable energy systems that generate electricity from water and wind.
Non-accredited testing of rotating electrical machines and drive systems for electric vehicles and industrial machinery
The tests cover electrical machines (motors and generators) and the associated inverter systems. The tests include:
- Electric motors and generators:
- with a power output of up to 680 kW at up to 1,480 rpm, a voltage of up to 6 kV and a frequency of 50 Hz
- with a power output of up to 200 kW at up to 2,000 rpm, a voltage of up to 660 V and a frequency of 0-65 Hz
- with a power output of up to 160 kW at up to 2,800 rpm, a voltage of up to 660 V and a frequency of 0-65 Hz
- with a power output of up to 30 kW at up to 18,000 rpm, a voltage of up to 660 V and a frequency of 0-65 Hz
- Electric drives with power inverters supplied with DC voltage up to 1 kV at up to 600 A. This includes tests of the following equipment:
- industrial drives
- powertrains for motor vehicles and single-track vehicles
- drone aircraft propulsion systems
- boat drives
The LET laboratory has the follwing power sources:
- AC voltage UAC do 3×130-800 V, with power rating up to 1 MVA and frequency 50 Hz
- AC voltage UAC 3×6 kV, , up to 1 MVA and frequency 50 Hz
- DC voltage UDC do 1000 V, at up to 600 A
- DC current IDC up to 1200 A, up to 8,4 kW
Scope of tests
Scope of electrical machine testing:
- measurement of insulation resistance of windings
- measurement of winding resistance
- idling test and loss at idle
- heating test
- locked rotor test
- determination of efficiency
- determination of mechanical characteristics of drive systems
- mechanical strength test at increased speed
- torque overload test
- IP rating tests
- measurement of sound power level
- vibration intensity measurement
Laboratory equipment:
Laboratory equipment:
- synchronous generator rated at 500 kVA, 3×400 V and frequency up to 65 Hz
- synchronous generator rated at 175 kVA, 3×400 V and frequency up to 65 Hz
- induction regulators rated at 1 MVA, 3×4.2-7.8 kV and 50 Hz
- induction regulators rated at 300 KVA, 3×0-860 V and 50 Hz
- DC dynamometer/generator rated at 680 kW with a rotational speed of 1480 min-1
- AC dynamometers rated at up to 200 kW and rotational speed up to 2000 min-1
- AC dynamometers rated at up to 160 kW and rotational speed up to 2800 min-1
- dynamic dynamometer rated at 30 kW and 18000 min-1
- dynamic dynamometer rated at 1-3 kW and a rotational speed of up to 4000 min-1
- 15 kW DC dynamometer with a rotational speed of 3600 min-1 with the possibility of feeding energy back into the grid
- induction dynamometer rated at 15 kW with a rotational speed of 3000 min-1 and the possibility of feeding energy back into the grid
- DC unit rated at 470 kW, 460 V
- DC unit rated at 2×7 V and 2×600 A
- dust chamber for IP rating testing
- resistors with a resistance range of 0.02-40 Ohm and current up to 600 A
- power analysers, power supplies, oscilloscopes, measuring probes, current shunts and transformers, torque, force, rotation, temperature, pressure, fluid flow meters, etc.
Selected measuring devices and instruments:
- YOKOGAWA WT1806E power analyser
FEATURES:
- basic accuracy: ±0.01%
- six input channels in one unit
- two analysers can be connected together (up to 8 channels)
- measuring bandwidth: DC and 0.1 Hz – 1 MHz
- voltage measurement range: 15/30/60/100/150/300/600/1000 V
- current measuring range: 0,5/1/2/5/10/20/30/50/200 A
- measurement recording function with a step of 50 ms
- communication interfaces: GPIB, RS232, USB
- advanced calculation functions (options): FFT analysis, mathematical functions on waveforms, harmonics measurement, calculation of the total efficiency of an electric motor including inverter with external speed and torque measurement, measurement of the CF peak factor
- clear 8.4″ LCD display, with two LED displays for reading the voltage and current range on the channels
- harmonics measurement in accordance with IEC61000-3-2 and IEC61000-3-12 (optional)
- voltage fluctuation/flicker measurement according to IEC61000-3-3 and IEC61000-3-11
2. Chroma’s 61800 series network regeneration simulator
Features:
- power range 30 kW
- voltage per phase: 0 – 400 VLN
- output frequency: DC, 30 Hz – 100 Hz
- 4-quadrant operation – full power transfer from test equipment
- designed specifically for testing photovoltaic inverters, lift inverters with energy recovery, UPS and back-up power systems, EV chargers, etc.
- single-phase or three-phase output selectable
- programmable voltage and frequency ramp-up rate of the output
- programmable limits for voltage and current
- switching on and off the phase output at any angle
- simulation of power line disturbances – LIST, PULSE, STEP mode
- simulation of voltage drops, short supply interruptions, voltage changes in the supply line
- generation of harmonics and interharmonics
3. Programmable 62000H Chroma DC power supply
Features:
- power range 15 kW
- available voltage range 0 – 1000 V
- available current range 0 – 375 A
- small mechanical dimensions with high power density, e.g: 15 kW in a 3U high power supply unit
- serial and parallel connection possible with current sharing in master/slave mode (up to 150 kW)
- accurate voltage and current measurement
- setting of the rise time of the output voltage and current
- easy parameterisation of the power supply with a numerical and function keypad and a rotary knob
- voltage ramp function (time range 10 ms to 99 hours)
- programming of automatic sequences: 10 programmes/100 sequences
- OVP overcurrent protection, current limitation, OTP thermal protection
- analogue interface and communication interfaces as standard: USB / RS-232 / RS-485
- remote switching of the output off/on
- compensation of voltage drops on connecting cables (remonte sense)
- 62020H-150S, 62050H-600S, 62050H-1000S, 62150H-600S, 62150H-1000S enable simulation of solar panel output characteristics – possibility to edit I/U characteristics and test and monitor PV inverter via softpanel
4. Chroma high-powered DC electronic load 63210E
Features:
- power: 10,4 kW
- voltage range: 0 V – 80 V / 0 V – 1000 V
- current range: up to 1000 A
- flexible operating modes: CC (constant current), CR (constant resistance), CP (constant power), CV (constant voltage)
- possibility to combine loads in parallel in master/slave control mode – allows static and dynamic load tests with a power of up to 93.6 kW
- simulating dynamic load changes at frequencies of up to 20 kHz. Programming of load levels and their durations as well as rise and fall times of the waveform
- low input resistance allows high currents to flow with little voltage increase (voltage rises to only 1 V when rated current flows)
- 41 A/µs programmable current ramp-up
- possibility to control the device via an external analogue signal
- measurement: voltage/current/power/resistance
- simulation of a short circuit and measurement of the short circuit current
- full protection: OCP (overcurrent), OPP (overload), OTP (temperature), OVP (overvoltage), reverse polarity protection
- universal remote control – optional
- digital interfaces: RS-232, GPIB facilitate the integration of devices into automatic measuring systems
- short-term overloading up to 2.7 × rated power – ideal for simulating loads where the average power is low and there is only a temporary increase in power demand, e.g. plasma panel simulation, DC motor simulation, car engine simulation
- test function for the discharge time of batteries
- PC-based tool software (graphical interface) (Soft Panel)
5. Torque meters
Features:
- rated torque 5 N·m, 500 N·m, 1 kN·m
- rated speed 15000 rpm (min-1)
- high permissible dynamic load
- high permissible lateral forces and bending moments
- exceptionally high torsional rigidity
- without bearings or slip rings
- calibration signals useful for commissioning and calibration
6. Braking systems with electronic feed-back to the grid
DC dynamometer with a power electronic device to provide the ability to feed energy back into the grid and control the dynamometer. The dynamometer is used to carry out load tests on electrical machinery used in vehicles. Rated brake power 15 kW, rated speed 3600 rpm.
