The Dell Precision 7530 can rapidly charge through its Thunderbolt 3 enabled Type-C ports using USB Power Delivery 2.0 technology. Let's see how this Dell PC gets powered using the Dell 130W USB Type-C AC Adapter that shipped with the Dell XPS 15 9575 (2-in-1) which is also the first 130W USB Power Delivery based power adapter in the market.
After the Dell Precision 7530 and Dell 130W USB Type-C AC Adapter have both been connected over Type-C, we observed USB Power Delivery charging using the GRL-USB-PD-C2 Compliance Test Solution App. At the beginning there was a very quick spike of both voltage and current which then immediately dropped down close to zero where charging almost never happened. The PC only started off pulling current later when the voltage went up to a 20 volts rail. During that time the PC was seen briefly drawing power up to 120 watts (20 volts @ 6 amps) over quick changing current. After a short while both voltage and current again dropped down to near zero to almost terminate charging for few minutes. When charging resumed, the PC was seen to briefly draw up to around 90 watts (20 volts @ 4.5 amps) from the adapter. The same cycle then kept on repeating where the PC was charging in between short intervals at mostly around 46 watts (20 volts @ 2.3 amps). With this uneven charging, unfortunately the Dell Precision 7530 can't really seem to charge properly with the Dell 130W USB Type-C AC Adapter over USB Power Delivery. See more details here by downloading the trace captured by the Granite River Labs USB Power Delivery Compliance C2 Tester.