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Flexible Rogowski Coils

Flexible Rogowski Coils


specifications of Rogowski Coils CTs

Input range5A100KA

Output range: 020mA  05V  010V(as per clients' request)

Accuracy class: 0.51%

frequency03MHZ

Flexible Rogowski Coil for Current Monitoring and Protected Circuit.

 

Rogowski Coils current transformers' technical details:

 

Type

Input current

Output current of Rogo Coils

Acc. class

Coil length

pls notice

               Integrator

Direct output

LS-8200A

200A

020mA  05V  010V

20mV

1.0

 

0.4m

Or 3m

 

 

 

Integrator output will require: 24V power

 

 

 

LS-8500A

500A

020mA  05V  010V

50mV

LS-81000A

1000A

020mA  05V  010V

1V

LS-82000A

2000A

020mA  05V  010V

2V

LS-83000A

3000A

020mA  05V  010V

3V

LS-84000A

4000A

020mA  05V  010V

4V

Flexible Rogowski Coils CT

Flexible Rogowski Coils current transformer are designed for easy placement
around cable bundle,  bus bars and breaker panels.

Rogowski Coils:

Rogowski coil (RC) current sensors are presented here operate on the same principle as coils that were first introduced in 1912 for magnetic field measurements.  At that time, the coils could not be used for relay protection because their output power was not sufficient to drive electro-mechanical relays.  However, with today's microprocessor-based equipment, RC current sensors are suitable for such applications.  Current transformers have traditionally been used for protection and measurement applications, in part because of their ability to produce the high power output needed by electromechanical equipment.  Microprocessor-based equipment makes high power output unnecessary.  This article presents novel solutions for differential protection of power transformers, busbars, generators, and large motors.  The initial projects included differential protection of EAF transformers, which are the first such applications in the U.S. and most likely in the world.

Rogowski Coil Principle of Operation

For comparative analysis of Rogowski coils and iron-core current transformers (CTs), equivalent circuits and vector diagrams for resistive load are shown in Figure 1.  The CT is a non-linear element that saturates whenever flux inside the CT core exceeds the saturation level, resulting in distorted and reduced secondary current that may cause relay misoperation.  However, CTs cannot saturate immediately upon the fault inception.  The time that it takes to begin the CT saturation is called time-to-saturation.  Manufacturers use different algorithms to achieve proper relay performance during the CT saturation or design relays to operate prior to the CT saturation.  Remanent flux in the CT core can also cause relay misoperation.  To reduce remanent flux, gapped-core CTs have been used.