Neutral Voltage Displacement TTG7114
The TTG7114 relay is designed to monitor neutral displacement voltage on AC networks (ANSI code 59N).  It is a definite-time relay which is desensitised to third harmonics.

The TTG7114 has only one phase input, making it best suited for connection to a voltage transformer on the neutral point of a network (or to three residually connected voltage transformers on the phases). 

Consider also the TTG7034 and TTG7134, which have separate voltage inputs for all three phases, allowing them to be connected to the same set of phase voltage transformers as other protection relays. 

See the homepage for Static relays for the full brochure.