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It should be noted that, aside from the incorrect operation just described, these pressure-type relayscan only detect faults inside the transformer tank. Faults on the bushings, and connecting leads, donot create an arc in the insulating oil or gas, and must be protected by differential relays. In fact, acombination of pressure relays and differential relays provides an excellent protection system fora power transformer. In the presence of gas pressure relays, the differential relays can be madeless sensitive. Indeed, one may attempt reclosing on those faults which cause the operation of thedifferential relay, but not of the pressure relay
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