Аннотация
Issues of resource saving are relevant in the field of energy, for example, the development of relay protection devices without the use of metal-intensive current transformers. As a result of the study, it was determined that reed switches can be used to build relay protection devices that do not need current transformers and allow you to compare phases of two electrical quantities. The error in comparing the phases of electrical quantities did not exceed 10%. There is no dead zone in the presented device, when the phase of the first electrical quantity changes by 180 degrees. The sensitivity is increased and the field of application is expanded due to signal amplification and ensuring the polarity of switching.