Transformer Neutral Grounding Reactor

[nhcf]

Need help understanding the ratings of an existing neutral grounding reactor -

It is installed on the neutral of a D-YG transformer, 13.2KV L-L.

The documentation states it is rated 5.99 ohm, 15.9 mH, 100A, 7.6 KV, 60 Hz.

What does the 100A rating signify? 5.99 ohms at 7.6 KV would suggest much higher currents. Is this a 10s rating?

 

[Parchie]

Most NGRs are designed to carry rated current for 10 seconds, IMHO. 100A rating means the NGR allows 100A at 7.6 kV for 10 seconds. To prevent damaging your NGR, please check if your protection trips earlier than 10 seconds.

Hope that helps.