NPR550 series microcomputer protection device

The NPR550 series transformer differential protection device is suitable for relay protection systems in substations of 110kV and below, serving as the main and backup protection for transformers.

NPR550-TD3H digital transformer differential protection device: main protection for three coil transformers
NPR550-TD2H digital transformer differential protection device: main protection for two coil transformers
NPR550-TB1H digital transformer high backup protection device: high backup on the 110kV side of the main transformer
NPR550-TB2H digital transformer high backup protection device: high backup on the 35kV side of the main transformer
NPR550-TB3H digital transformer backup protection measurement and control device: backup on the medium and low voltage sides of the main transformer
NPR550-T3H digital non electricity protection and measurement device: non electricity protection, temperature measurement