This paper investigates protection coordination for a 100% grid-forming offshore wind farm connected to a diode rectifier unit (DRU) HVDC link supplying a large load plant. The fault response of the grid-forming wind-turbine converters and the associated offshore protection requirements are analysed. A layered protection scheme combining overcurrent, directional overcurrent, and line-current differential functions is proposed to detect and selectively isolate short-circuit faults in the offshore collector network. Electromagnetic-transient simulations in PSCAD demonstrate converter fault-current limitation, string-level fault isolation using directional overcurrent protection, and cable-section-level isolation using line-current differential protection. A hydrogen electroiysis plant is used as the case study; however, the proposed protection principles are independent of the specific end-use load and are applicable to other converter-interfaced large loads, including data centers