Relay protection device and method for secondary voltage phasing and phase checking

The invention belongs to the technical field of relay protection secondary circuits, and discloses a relay protection device and method for phasing and phase checking of secondary voltage. The device is used for carrying out phasing and phase checking measurement on voltage before new equipment or transformed equipment of a power system is officially put into operation; the system specifically comprises a signal acquisition module, a central controller, a phase sequence display module, a voltage measurement module and a power supply module. The device is used for measuring the voltage difference between two phases on different sides of a system, the voltage difference is compared with a calculated phasor sequence digital table, the phase relation between the two phases on the different sides is obtained, and phasing and phase checking are carried out according to the phase relation. The device can simply and conveniently carry out phasing and phase checking of new commissioning equipment, reduces the power fa