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BHARATI VIDYAPEETH’S COLLEGE OF
ENGINEERING
PRESENTED BY
Shashank Singhal
Optical Technology Applications—Began in 1986
with combined efforts of TVA and ABB.
Basis for MOCT--Interaction between the magnetic
field of the primary conductor and the optical activity
of glass material
Magneto optical current transformer is an
instrument transformer ,using the angle of rotation
of linearly polarized light to measure the current.
Measures current by means of Faraday’s Effect.
It fulfills the two purposes-metering and relaying.
MOCT -PRINCIPLE
 Faradays effect-the plane of polarization of linearly polarized light was
rotated under the influence of a magnetic field parallel to the
direction of light propagation when light is propagated in a piece of
glass, and the rotation angle was proportional to the intensity of the
magnetic field .
Working
 The light rays are polarized by passing them through a polariser
material.
 These polarized light rays are then passed through an optical rotator.
 The phase orientation of the light beam is rotated as it travels
through the rotator material, amount of rotation is directly
proportional to the current passing through the conductor.
 The analyzer(second polarizer) measures the amount of shift in the
light beam into corresponding amount of light intensity
 This intensity modulated light is conducted though an optical fibre
to a PIN diode which generates the corresponding electric signal
which is then amplified and filtered.
Working
Polariser And Analyzer orientations
Implementation
Variation of light intensity
 Light enters the polariser at a zero degree, shift is induced in the
polarised beam—greater the amount of shift towards the 45
degree point of the analyser, greater the intensity of light
PARTS OF MOCT
DESIGN
The optical sensor consists of two
separate clamp-on parts and linearly
polarized light is arranged to pass
through the optical glass prism to
pickup the Faraday rotation signal.
The polarization compensation
technique is applied at each corner
of the prisms, so that the light
passing through the prism remains
linearly polarized.
DESIGN
MAGNETO-OPTICAL SENSOR
 Almost all transparent material exhibits the magneto-optical
effect or Faraday Effect, but the effect of some of the material
is very temperature dependent, and they are not suitable for
the sensing material.
 MOCT made out of SF-57 materials can achieve higher
sensitivity.
 The total internal rotation angle is  1+ 2  2VI
I : current to be measured,
 = 4 x 10-7 H/m
V=7.7 x 102 degrees/Tm at a wavelength of 820nm
 Therefore  = 1.9 degrees/ KA.
 Another material used as an optical sensor is SF6 due to its
relatively high verdet co-efficient and low temperature
dependency.
 Sometime it calls SCHOTT SF6 , contains
 Sio2-27%, Pbo2-71%, K2o-1%, Na2o-0.5% and As2o3-0.3%
ELECTRONIC CIRCUIT FOR THE MOCT
APPLICATION
 The MOCT is designed to operate with modern electronic
meters and digital relays, which have been adopted for a low
energy analog signal interface.
 The design approach is to redefine the interface point as to
input the analog to digital conversion function used by each
of these measurement systems.
 Due to their effect of optical isolation, they provide increased
safety and thus can be widely employed in substations
ADVANTAGES
 No risk of fires and explosions.
 No need to use metallic wires to transfer the signal and so
simpler insulation structure than conventional current
transformer.
 High immunity to electromagnetic interference.
 Wide frequency response(10 Hz to 10 KHz)
 Low voltage outputs which are compatible with the inputs
of digital to analog converters.
 No saturation under fault current.
 No ratio change required.
DISADVANTAGES
 Temperature and stress induced linear birefringence in the
sensing material causes error and instability.
 The accuracy of MOCT is so far insufficient for the use in
power systems.
 Requires optical test Equipment.
 Unable to drive 5 Amp secondary circuits.
Reference
 “optical voltage transducers using multiple electric
field sensors”. IEEE transactions on power delivery
,vol.17 april 2002
 J C Santos ,M.C Taplama Ciogle and K Hidak
 http://www.iop.org/EJ/article
 http://www.cris-inst.com/publication/bejing
 Physics for engineers by Premlet
Magneto-optic-current-transformer

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Magneto-optic-current-transformer

  • 1. BHARATI VIDYAPEETH’S COLLEGE OF ENGINEERING PRESENTED BY Shashank Singhal
  • 2. Optical Technology Applications—Began in 1986 with combined efforts of TVA and ABB. Basis for MOCT--Interaction between the magnetic field of the primary conductor and the optical activity of glass material Magneto optical current transformer is an instrument transformer ,using the angle of rotation of linearly polarized light to measure the current. Measures current by means of Faraday’s Effect. It fulfills the two purposes-metering and relaying.
  • 3. MOCT -PRINCIPLE  Faradays effect-the plane of polarization of linearly polarized light was rotated under the influence of a magnetic field parallel to the direction of light propagation when light is propagated in a piece of glass, and the rotation angle was proportional to the intensity of the magnetic field .
  • 4. Working  The light rays are polarized by passing them through a polariser material.  These polarized light rays are then passed through an optical rotator.  The phase orientation of the light beam is rotated as it travels through the rotator material, amount of rotation is directly proportional to the current passing through the conductor.  The analyzer(second polarizer) measures the amount of shift in the light beam into corresponding amount of light intensity  This intensity modulated light is conducted though an optical fibre to a PIN diode which generates the corresponding electric signal which is then amplified and filtered.
  • 6.
  • 7. Polariser And Analyzer orientations
  • 9.
  • 10. Variation of light intensity  Light enters the polariser at a zero degree, shift is induced in the polarised beam—greater the amount of shift towards the 45 degree point of the analyser, greater the intensity of light
  • 12. DESIGN The optical sensor consists of two separate clamp-on parts and linearly polarized light is arranged to pass through the optical glass prism to pickup the Faraday rotation signal. The polarization compensation technique is applied at each corner of the prisms, so that the light passing through the prism remains linearly polarized.
  • 14. MAGNETO-OPTICAL SENSOR  Almost all transparent material exhibits the magneto-optical effect or Faraday Effect, but the effect of some of the material is very temperature dependent, and they are not suitable for the sensing material.  MOCT made out of SF-57 materials can achieve higher sensitivity.  The total internal rotation angle is  1+ 2  2VI I : current to be measured,  = 4 x 10-7 H/m V=7.7 x 102 degrees/Tm at a wavelength of 820nm  Therefore  = 1.9 degrees/ KA.
  • 15.  Another material used as an optical sensor is SF6 due to its relatively high verdet co-efficient and low temperature dependency.  Sometime it calls SCHOTT SF6 , contains  Sio2-27%, Pbo2-71%, K2o-1%, Na2o-0.5% and As2o3-0.3%
  • 17. APPLICATION  The MOCT is designed to operate with modern electronic meters and digital relays, which have been adopted for a low energy analog signal interface.  The design approach is to redefine the interface point as to input the analog to digital conversion function used by each of these measurement systems.  Due to their effect of optical isolation, they provide increased safety and thus can be widely employed in substations
  • 18.
  • 19. ADVANTAGES  No risk of fires and explosions.  No need to use metallic wires to transfer the signal and so simpler insulation structure than conventional current transformer.  High immunity to electromagnetic interference.  Wide frequency response(10 Hz to 10 KHz)  Low voltage outputs which are compatible with the inputs of digital to analog converters.  No saturation under fault current.  No ratio change required.
  • 20. DISADVANTAGES  Temperature and stress induced linear birefringence in the sensing material causes error and instability.  The accuracy of MOCT is so far insufficient for the use in power systems.  Requires optical test Equipment.  Unable to drive 5 Amp secondary circuits.
  • 21. Reference  “optical voltage transducers using multiple electric field sensors”. IEEE transactions on power delivery ,vol.17 april 2002  J C Santos ,M.C Taplama Ciogle and K Hidak  http://www.iop.org/EJ/article  http://www.cris-inst.com/publication/bejing  Physics for engineers by Premlet