Start with what these systems have in common

Nitrogen-injection fire prevention systems share a basic idea. On a qualifying fault, the system acts to cool and displace oxygen so burning oil doesn’t spread. Commonly, that involves releasing some oil from the top of the tank and injecting nitrogen at the bottom. A control unit takes input from fault signals and often a fire detector. Details differ by design, so verify them with each supplier.

Why many systems wait for several signals

Conventional schemes often require more than one condition (for example, a relay trip plus a detector or pressure indication) before activating. That’s a reasonable choice, not a flaw. A false operation can drain oil and take a healthy transformer out of service. The trade-off is time: more confirmation means more delay.

What EMR Global says about its approach

EMR Global describes its NITPS as using in-tank arc sensors for early arc detection, with a stated detection time of about 50 milliseconds. Treat that as a supplier claim, and ask:

• Does 50 ms mean detection only, or detection to nitrogen injection?
• Under what fault type and test conditions was it measured?
• Is there an independent test certificate?
• How does the design avoid false trips from non-fault events?
• What does the system do if the sensor path fails?

A buyer’s comparison grid

Whichever system you choose, it should be part of a fire-protection design signed off by qualified engineers, not a standalone purchase.

For the supplier’s own comparison, see EMR Global’s page on NITPS vs NIFPS differences.