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Understanding Sepam Series 10 Current Sensors for RM6/SFset Applications

Explore the use of CRa, CRb, CSa, and CSb proprietary current sensors developed for VIP range relays. Learn about sensor ratings, linear region, and restrictions when used with Sepam Series 10.

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Understanding Sepam Series 10 Current Sensors for RM6/SFset Applications

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  1. Sepam series 10 Proprietary current sensors CRa, CRb, CSa, CSB

  2. Use of RM6/SFset proprietary sensors CRa, CRb, CSa CSb • RM6 and SFset use specific current sensors initially developed to be used with VIP range relays. • CRa : 200A/1A rated for RM6 • CRb : 1250A/1A rated for RM6 • CSa : 200A/1A rated for SFset • CSb : 1250A/1A rated for SFset • As they were developed for VIP range only, these sensors were not classified in accordance to the standards : they don't have any classification like 5P20 for IEC or C20/C50. • These sensors can be used with Sepam series 10 with some restrictions

  3. Measured Current Linear region ISC Use of RM6/SFset proprietary sensors CRa, CRb, CSa CSb • CT behavior • CT has a linear region where secondary current is the exact image of primary current • Above this region, CT will saturate and become non linear • CT must only be used in the linear region

  4. Use of RM6/SFset proprietary sensors CRa, CRb, CSa CSb • Condition of use with Sepam series 10 :

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