NA011 Feeder Protection Relay
The NA011 is a feeder protection relay that can be utilized in radial networks for protecting feeders or power transformers.
In solidly grounded systems, the Thytronic NA011 residual overcurrent protection relay can be used on feeders of any length. However, in ungrounded systems or those with a Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on shorter feeders to prevent unwanted trippings due to the capacitive current contribution of the feeder during external ground faults.
The Thytronic NA011 feeder protection relay can be supplied with traditional CTs or low power (LPCT) current inputs. For both versions, the residual current can be directly measured (using CTs or a balanced transformer) or calculated via vector sum of the three-phase currents.
Features of the NA011 Protection Relay
The Thytronic NA011 protection relay offers a range of features to ensure optimal safety and control. These include automatic reclosure for a timely and efficient handling of interruption events, supervision of circuit breaker failure, and monitoring of maximum residual and phase overcurrents to guarantee comprehensive and reliable protection. Additionally, the relay is equipped with the Modbus RTU RS232 protocol. The use of Thyvisor software ensures quick and easy programming, setting, and management of the relay.
