FIELD: electricity.
SUBSTANCE: single-system differential current protection of a reactor power winding includes two insaturable current sensors connected between two outputs of the power winding neutral point and a point of their connection to the earthing network, at that a current relay (a measuring element of the protection) is activated by the current difference of the above sensors upon separation of the main component of the first harmonic by filters, which passes through each current sensor and applies when the preset value is exceeded for a shutdown of the reactor switch without time delay.
EFFECT: increase in the response speed and sensitivity of the relay protection.
2 dwg
