QHNM 306  ABB  Gate Module

The CT PRO XT current transformers range is designed for distribution systems using cables up to 18 mm in diameter, and primary busbars with dimensions up to 20 x 10 mm. Order codes are available with primary rated current up to 400 A. CT PRO XT transformers are the ideal solution for distribution and sub-distribution switchboards downstream ABB modular circuit-breakers (SN201, S 200, S 280, S 800, DS 201, DS 202C, DS 941) or downstream of Tmax circuit-breakers (XT1, XT2, XT3, XT4 and T4320).

The CT MAX current transformer range founds its main application in distribution systems with 30x10 mm and 40x10 mm horizontal primary busbars and primary rated current from 300 up to 1000 A. A primary cable up to 30 mm in diameter can also be used. CT MAX transformers are the ideal solution for applications downstream ABB Tmax T5 and T6 circuit-breakers.

Split core measurement current transformers are used in distribution panels or power centers for maintenance or system expansion. They can be installed easily and they allows to save a lot of time, avoiding bar disconnection. All transformers are complete with terminal caps and fastening accessories, both on bar and on wall.

TRF M are modular current transformers with through primary for measuring instruments. Their compact size and quick DIN rail plug allow easy installation along with great measurement precision.

Certainly! Reversal of the connections to the TA’s secondary terminals or the wrong insertion of the primary cable can cause an incorrect measurement readings from the instrument. If one of the above situations occurs, the instrument measures a secondary current on its terminals that flows in the opposite direction of what actually happens. This can lead to different consequences depending on how the firmware of the measuring device has been designed. A wrong connection in unidirectional instruments (reading on 2 quadrants) may be signaled by an error message. On the other hand, it may not be signaled but cause an incorrect count of the instrument, or lead to the interruption of the measurement process. In bidirectional instruments (reading on 4 quadrants), this situation causes the imported power to be read as exported power and vice versa.

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