Mounting Measuring Devices of Reed Switch Protection Near Conductors of Electrical Installations

摘要

The use of reed switches as measuring devices of relay protection is noted to solve the urgent problem of their construction without using current transformers. It is emphasized that the implementation of protection on reed switches is impossible without dedicated mounting near the conductors of electrical installations. It is noted that a number of models of such mounts have already been developed, while further advancement in this direction is required as well. Three new designs of measuring devices of protection are proposed for mounting reed switches near the busbars of cubicle switchboards arranged horizontally in a row, and near the busbars of bundled conductors located at the vertices of an equilateral triangle. The first mount differs from the known designs by the presence of a plate with reed switches, a plate with a scale and a rod with a thread and a handle. The second is a C-shaped platform with a support insulator, a case with a lid and a plate with reed switches. The third - with a double ear clamp and two pivoting bows with drum ratchets with reed switches. The strength of the third mount is assessed using the Pisarenko-Lebedev criterion, and a table with the calculation results of equivalent mechanical stresses in its clamp is given.