Numerical Transformer Differential Relay : IRD1T2-WG

Range

• Dropout ratio: >96%
• Returning time: 50 ms
• Hi-Set Triptime:<= 2O ms (Tolerance + 5ms)

Features

• Numerical Relay
• Very low CT burden
• Built-in provision for CT ratio and phase angle corrections without external interposing CTs
• Dual slope characteristic

Presentation

The Transformer Differential Numeric Relay type IRDITQ-WG is built around a powerful 32-bit Digital Signal Processor. It provides fast and selective tripping for two winding transformer. It quickly discriminates between faults that occur in the protected zone and those occurring outside this zone and thus provides selective and fast tripping. The faults within protected zone are short circuit between turns,
windings and cables and earth faults inside transformer housing and protected zone. IRDITZ-WG discriminates between above internal faults
and the operational conditions like inrush, over-fluxing and faults external to protected zone using numerical algorithms.

Benefits

• Stabilization against inrush
• Prevention of nuisance tripping during transient CT Saturation
• Stabilization against transient over-fluxing
• High-set tripping threshold
• Universal auxiliary supply
• Galvanic isolation between independent inputs
• Wide setting range