| Sudden pressure relays often fall into one of two categories: pressure sensing or flow sensing. What follows is a description of the fundamental working principles of each:
Principle #1 – Pressure Sensing One approach involves positioning the sensing connection in the gas compartment of a pressurized transformer, with the sudden pressure detecting relay situated on top of the transformer. An "In Gas" abrupt pressure relay is what this is called.As illustrated in Figure 1, the sensing chamber is equipped with a micro-switch, bellows, and an aperture that links it to the reference chamber. As a function of temperature, the internal gas pressure of a transformer will rise and fall during normal operations. Due to the slow nature of the pressure shift, enough flow can pass through the aperture to maintain a constant pressure in both the sensing and reference chambers. | 
Comments
Post a Comment