MOCT MAGNETO OPTICAL CURRENT TRANSFORMER PRINCIPLE OF MOCT

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MOCT MAGNETO OPTICAL CURRENT TRANSFORMER

MOCT MAGNETO OPTICAL CURRENT TRANSFORMER

PRINCIPLE OF MOCT ØThe Magneto-Optical current transformer is based on the Faradays effect. .

PRINCIPLE OF MOCT ØThe Magneto-Optical current transformer is based on the Faradays effect. .

ØGenerally, this phenomenon can be described as follows: = V dl (1) Ø ‘

ØGenerally, this phenomenon can be described as follows: = V dl (1) Ø ‘ ’ is the Faraday rotation angle, Ø ‘V’ is the Verdet constant of magneto-optical material, Ø ‘B’ is the magnetic flux density along the optical path, Ø ‘l’ is the optical path.

Ø Eq. (1), can be rewritten according to Ampere’s law as: =n VI (2)

Ø Eq. (1), can be rewritten according to Ampere’s law as: =n VI (2) Ø ‘I ‘is the current to be measured, Ø ‘ ’ is the permeability of the material, Ø ‘n’ is the number of turns of the optical path.

Ø The typical application of the Faraday effect to an MOCT is clear from

Ø The typical application of the Faraday effect to an MOCT is clear from fig.

Ø The output optical signals from the analyzer can be described as, P 1

Ø The output optical signals from the analyzer can be described as, P 1 = (P 0 / 2) (1 + Sin 2 ) (3) P 2 =(P 0 / 2) (1 - Sin 2 ) (4) Ø P 0 is the optical power from the light source, Ø is the Faraday rotation angle, Ø P 1 and P 2 are the optical power delivered by the detectors.

DESIGN OF MOCT Ø The following fig shows the structure of MOCT.

DESIGN OF MOCT Ø The following fig shows the structure of MOCT.

Ø The two halves can be assembled around the conductor. Ø The rotation angles

Ø The two halves can be assembled around the conductor. Ø The rotation angles from the two halves of the sensor Fig(a) are added up in the signal processing unit so that the total rotation angle ( 1+ 2 ) is the same as the rotation angle from the optical path shown in Fig(b), which is two turns around the conductor.

Ø Fig shows the structure of the housing for the clamp-on MOCT.

Ø Fig shows the structure of the housing for the clamp-on MOCT.

MAGNETO OPTICAL SENSOR Ø Almost all transparent material exhibits the magnetooptical effect or Faraday

MAGNETO OPTICAL SENSOR Ø Almost all transparent material exhibits the magnetooptical effect or Faraday Effect. Ø In the MOCT, from Eq (2), the total internal rotation angle is, 1+ 2 2 VI (5) Ø Where I is the current to be measured, Ø = 4 x 10 -7 H/m, Ø V=7. 7 x 102 degrees/Tm at a wavelength of 820 nm, Ø Therefore = 1. 9 degrees/ KA.

ELECTRONIC CIRCUIT FOR MOCT

ELECTRONIC CIRCUIT FOR MOCT

ADVANTAGES OF MOCT Ø No fires and explosions. Ø No need to use metallic

ADVANTAGES OF MOCT Ø No fires and explosions. Ø No need to use metallic wires to transfer the signal. Ø Immune to electromagnetic interference. Ø Wider frequency response and larger dynamic range. Ø Low voltage outputs.

DISADVANTAGES OF MOCT Ø Temperature and stress induced linear birefringence causes error and instability.

DISADVANTAGES OF MOCT Ø Temperature and stress induced linear birefringence causes error and instability. Ø Insufficient accuracy.

APPLICATIONS Ø The MOCT is designed to operate in a transparent manner with modern

APPLICATIONS Ø The MOCT is designed to operate in a transparent manner with modern electronic meters and digital relays. Ø The MOCT system satisfies current sensoring needs for revenue metering or protective relaying.

CONCLUSION Ø Magneto optical current transducer eliminates many of the drawbacks of the conventional

CONCLUSION Ø Magneto optical current transducer eliminates many of the drawbacks of the conventional current transformers. Ø By applying Faraday’s principle this transducer provides an easier and more accurate way of current measurement. This MOCT is widely used in power systems and substations nowadays. Ø A new trend is being introduced, which known as OCP based on adaptive theory.

ANY QUERIES? ? ?

ANY QUERIES? ? ?

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