What is the primary purpose of the "86 Lockout Relay"?

The primary purpose of the "86 Lockout Relay" is to prevent the turbine generator from starting up in the event of certain fault conditions or unsafe operational scenarios. This relay acts as a protective device that ensures the turbine does not operate under conditions that could cause damage to the equipment or create unsafe situations. By preventing startup, it safeguards both the turbine and the connected electrical systems, allowing for maintenance or the resolution of issues that would otherwise lead to a hazardous environment or system failure.

In contrast, the other options pertain to different functions not specific to the role of the lockout relay. Regulating power supply, measuring voltage levels, or activating safety alarms serve distinct purposes within an electrical system but do not encapsulate the critical protective function of the 86 Lockout Relay, which is expressly designed to inhibit operations until it's safe to proceed. This aspect is crucial in maintaining system integrity and safety within power generation and distribution contexts.