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RT 2000
Flexible split-core Rogowski coil for the electronic measurement
of AC waveform currents, with galvanic isolation between the
primary circuit (power) and the secondary circuit (measurement).
The patented Perfect Loop Technology denitely solves the problem
of the Rogowski coil opening by introducing a specic magnetic
device. This dramatically reduces both the error due to the position
of the measured conductor within the sensor, and the error due to the
proximity of external conductors.
Electrical data
IPN Primary nominal current rms 2000 A
M Transfer ratio (± 5 %) 1) 0.064 µH
VOUT Output voltage (instantaneous) 2) VOUT = M× V
VOUT Output voltage (sinusoidal wave) 2) VOUT = 2×p×M×f×IP AC V
Example: @ 50 Hz, 2000 A VOUT = 2×p×64×10-9×50×2000 = 40.2 mV
LS Coil inductance (± 5 %) 190 µH
RS Coil resistance @ TA = 20°C typical 60 Ω
High cut-off frequency 2) (+3dB) 500 kHz
Accuracy - Dynamic performance data
εL Linearity error none
TCM Temperature coefcient of M 30 ppm/K
εP Positioning error 3) max 0.65 %
General data
TA Ambient operating temperature (90 % rH) - 10 .. + 65 °C
TS Ambient storage temperature - 25 .. + 70 °C
m Mass 90 g
IPXX Protection index IP 2X
Standards Safety IEC 61010-1: 2001 2nd edition
IEC61010-2-032: 2002
IEC61010-031:2002+Amd 1:2008
Notes: 1) LEM provides uncalibrated coils with up to 5 % manufacturing tolerance.
Calibration must be performed within the nal application.
2) Open circuit condition (no load)
3) Considering a primary conductor of at least Ø 15 mm,
perpendicular to the RT loop.
Features
● Split core type
● Ø 125 mm sensing aperture for
non-contact measurement
● 1.5 m output cable
● Isolated plastic case recognized
according to UL 94-V0.
Advantages
● Thin, lightweight and exible
● Easy installation suitable even for
the most conned spaces
● Very low positioning error.
Applications
●Power meters
Current measurement for active
Power calculation.
●Energy sub-meters
For energy efciency monitoring,
consumption analysis and costs
allocation.
●Power quality monitoring
●Condition monitoring
(e.g. Motor loads such as
conveyers, pumps or HVAC).
●Distributed measurement
systems.
Application domain
● Energy Solutions.
dI P
dt
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RT 2000
Isolation characteristics
Vb Rated isolation voltage rms 1) 300 V
with IEC 61010-1 standards and following conditions:
- Reinforced isolation
- Over voltage category CAT III
- Pollution degree PD2
- Heterogeneous eld
Vd Rms voltage for AC isolation test 2), 50 Hz, 1 min 3.5 kV
Vw Impulse withstand voltage 1.2/50 µs 6.5 kV
Min
dCp Creepage distance 6 mm
dCI Clearance distance 6 mm
CTI Comparative Tracking Index (group I) 3) 600 V
Notes: 1) Between primary conductor and ground. If isolated cable is used for the
primary circuit, the voltage category could be improved according to the
primary cable insulation category
(please refer to the cable manufacturer’s indications)
2) Between primary (completely lling the hole) and secondary
3) Plastic parts.
Safety and warning notes
In order to guarantee safe operation of the transducer and to be able to make
proper use of all features and functions, please read these instructions thoroughly!
Safe operation can only be guaranteed if the transducer is used for the purpose
it has been designed for and within the limits of the technical specications.
Ensure you get up-to-date technical information that can be found in the latest
associated datasheet under www.lem.com.
Caution! Risk of danger
Ignoring the warnings can lead to serious injury and/or cause damage!
The electric measuring transducer may only be installed and put into
operation by qualied personnel that have received an appropriate training.
The corresponding national regulations shall be observed during
installation and operation of the transducer and any electrical conductor.
The transducer shall be used in electric/electronic equipment with respect
to applicable standards and safety requirements and in accordance with all
the related systems and components manufacturers’ operating instructions.
Caution! Risk of electrical shock
When operating the transducer, certain parts of the module may carry
hazardous live voltage (e.g. primary conductor). The user shall ensure
to take all measures necessary to protect against electrical shock. The
transducer is a build-in device containing conducting parts that shall not be
accessible after installation. A protective enclosure or additional insulation
barrier may be necessary. Installation and maintenance shall be done with
the main power supply disconnected except if there are no hazardous live
parts in or in close proximity to the system and if the applicable national
regulations are fully observed.
Safe and trouble-free operation of this transducer can only be guaranteed if transport,
storage and installation are carried out correctly and operation and maintenance are
carried out with care.
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Dimensions RT 2000 (in mm.)
Ip
Mechanical characteristics
● General tolerance ± 1 mm
● Output cable length 1500 mm
WARNING!
Do not stress the coil by applying any kind of
mechanical force (ie. twisting, puncturing, excessive
pressure, tight bending, etc.) which will dramatically
degrade the device’s accuracy.
Remarks
●VOUT = VS+- VS- is positive when diP/dt ows in the direction
of the arrow (see g. 1)
● Due to low positioning error (εP), the device does not
need to be physically fastened around the primary
conductor. Should the device be secured, make sure no
mechanical stress is applied to the coil itself.
Connection
Fig. 1