Should substation DC battery rack metals be bonding/grounding to the substation ground grid?

One: Substation DC battery rack metals should be better without bonding/grounding to the substation ground grid, because during the fault the substation area elevate on potentials so the grounding may affect the battery functionality.

What is a floating ground in a substation?

Typically DC system in substation is ungrounded, positive and negative terminals run throughout the substation and not grounded at any point in other words can be termed as floating ground. The purpose of adapting this type of DC framework is to ensure high resistance with reference to the ground.

How to identify DC ground fault in a substation?

In practice the following strategies are employed to identify DC ground fault in a substation. In this method, a suitable resistance is connected between positive bus to ground and negative bus to ground. The ratio of voltage from positive bus to ground and negative bus to ground is taken for finding whether the DC system is grounded or not.

What is a ground grid in a substation?

One of the fundamental parts of the electrical substation is a ground grid which provides proper grounding of all apparatus in substations (including transformers, circuit breakers, capacitor banks, steel tower structures, etc.).

Why is battery design important in a substation?

The battery design is more important with reference to the outage time of the battery charger . Typically DC system in substation is ungrounded, positive and negative terminals run throughout the substation and not grounded at any point in other words can be termed as floating ground.

What happens if a second terminal fault occurs in a substation?

The second terminal fault can disturb the complete protection scheme feeding the substation equipments which may even result permanent failure of the DC systems . DC supply is typically used feeding continuous load such as trip coils, relay coils, DC contactors and NO-NC switches in a substation.