Issue
Documentation request for CSH120 and CSH200 zero sequence current transformers

Product Line
Sepam Protection Relays

Environment
CT installation for protection relays

Cause
The specifically designed CSH120 and CSH200 zero sequence current transformers (CTs) measure direct residual current (Ir). The only difference between them is the diameter. Due to their LOW_VOLTAGE insulation, they are used only on fully insulated cables.

Resolution
See attachment
CSH120 and CSH200 Zero Sequence Current Transformers (CTs) Installation Sheet, Instruction Bulletin (ANSI), 63230-216-241A1, May 2007