The LXB-1E current phase comparison relay is used as a selection element in phase comparison bus differential protection circuits.

Technical requirements for LXB-1E current phase comparison relay
1. The rated current IH is 1A, 5A, and the rated frequency is 50-60Hz.
When Ic and Im are greater than IH and less than 30IH, the action zone is 140o~180o, with no repeated action zone.
3. The maximum sensitivity angle is 0o ± 4o, 180o ± 4o.
Under the condition of maximum sensitivity angle, when any current changes within 30IH, the starting current shall not exceed 0.5IH.
5. Under the condition of maximum sensitivity angle, when Ic, Im, is not less than IH, the action time shall not exceed 40ms.
When Ic and Im are both IH, the total power consumption of the relay shall not exceed 1.5VA.
In a DC inductive load circuit with a voltage not exceeding 220V and a current not exceeding 0.2A (time constant of 5 × 10-3S), the contact breaking capacity is 10W; in an AC circuit, it is 20VA.
The weight of the relay is approximately 2.1kg.

LXB-1E type current phase comparison relay