Longitudinal differential protection circuit
Source: InternetPublisher:公子李 Keywords: Protection circuit BSP motor TIMES Updated: 2021/12/21
The motor cover movement protection can use two-phase two-relay wiring, as shown in the figure.
Relay KA can use DL-11 type current relay or special differential relay.
The operating current k(d) of the differential protection should be set according to the rated current INM of the motor
. The setting calculation formula is
Iop (d) × INNI/k,
where d is the reliability coefficient of the protection device. For DL type relay, take 1.5~2.
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