469-P5-LO-A20-E 继电器的相电流互感器

What should be the phase current transformer, ground current transformer and motor full load current of the relay? For the GE 469-P5-LO-A20 relay, the phase current transformer must be selected at 50% to 100% of the full load current of the primary current transformer, but for A full load current of 347.5A, a 350:5 or 400:5 current transformer can be selected, and 400:5 is the standard for the selected size. The high resistance grounding system is sensitive to ground detection and can be used for 50:0.025 CT. Other data sheets for the phase current transformer and the ground current transformer specify that the motor full load current is set to 348A. What are the overload start and overload curve Settings for GE motor management relays? The overload starting setting should be at the maximum operating factor of 1.25 times the full load current, so that the motor operating factor is 1.15, and if the operating factor is unknown, it should be automatically set to 1.0. The motor is equipped with a resistance temperature detector (RTD), which is used by the relay to protect the overload sensor. In order that the overload curve does not compromise the protection of the relay, the overload curve should be set at the standard overload curve and have the longest processing time, which will be just below the hot and cold limits. Overload curve 7 works best for this relay.