What grounding condition is specified for the high and low side in a wye-wye connection?

In a wye-wye connection, the specified grounding condition for both the high and low sides is a solidly connected to earth ground. This means that both sides of the wye configuration are directly connected to the earth. This type of grounding provides a low-impedance path to ground, which is essential for fault protection and system stability.

Solid grounding helps in rapid clearing of faults by allowing large fault currents to flow through the grounding system, which aids in the operation of protective devices like circuit breakers or fuses. This is particularly important in power systems where reliability and safety are paramount.

Isolated grounding, ungrounded systems, and partially grounded systems do not provide the same level of fault protection and system reliability as solid grounding. For example, isolated and ungrounded systems can lead to voltage rise during a fault, potentially causing equipment damage. Moreover, partially grounded systems may not effectively manage fault currents in the same way that solidly grounded systems do. Thus, solidly connecting both the high and low sides to earth ground is the preferred and specified condition in wye-wye connections to ensure safety and operational integrity.