Current transformer SSR series

instrumentdryDIN rail mount

Summation current transformers SSR-2 to SSR-9 are used to summarize secondary currents of several main c.t.`s in order to measure with one instrument only. The output current again constitutes a standardized quantity. That means the primary currents are not only added but also divided by the number of inputs. If using unequal main c.t.`s the ratio of the lowest primary current to the highest one should not exceed 1:10. When ordering in case of unequal main c.t.`s the ratio of each of them has to be specified absolutely. Unused primary connections have to be open circuited as opposed to the short circuiting of secondary connections. The summation current transformers SSR-2 to SSR-9 sums up the instantaneousvalues of diffrent currents in a network, providing a proportional alternatingcurrent. In order to that, several measuring transformers (main transformers)are used, one for each current, with their secondary windings connected tothe primary windings of the summation transformer. All the primary windingsof the summation current transformer must be connected to the same phase.If any of the primary windings of the SSR are not to be used, they must beleft open. The standard execution is prepared for main transformers of thesame transformation ratio. Otherwise, please indicate their ratios in yourorder.