I was walking around at work today to find an AC amp Gauge on a DC breaker (1000KW, 250 VDC), Which made me scratch my head if there is any difference between the two gauges for this application?
In general, AC and DC ammeters are different creatures.Which made me scratch my head if there is any difference between the two gauges for this application?
Judging from your photos i strongly suspect you are in a switchgear room or control room of a substation that's handling AC. Reason i say that is i've simply never heard of a DC substation, and those breakers are labelled "substation tie". I'd expect AC in a substation, in the thousands of amps .those meters report.I attached pictures reflecting the above situation.
what's the reasoning behind that gauges difference in terms of their fabrication. More explicitly why DC gauge won't read the AC or at least the RMS value
Aha !and for the breakers addressed earlier they're fed from different rectifiers (250VDC, 1000KW) that are directly fed different 11.5KV.
well then they probably are ordinary DC meters that use a shunt . I'd guess they just came in with wrong lettering on the face. Be careful the wires on the back are probably at 250 VDC.the gauges are after the DC side of the rectifier.