Electrical Surge Protection

Depends on how much money you want to spend, but you might consider some power conditioner options...It depends on how severe your power problems are I guess as to how often the machinery fails and how much it costs to repair or replace, plus downtime...If the problems are severe and the failures often, then power conditioning and backup becomes necessary....

https://www.grainger.com/category/electrical/power-management-circuit-protection-and-distribution/power-meters-power-supplies-solar-transformers-and-ups/ups-and-surge-suppression/power-conditioners

It really depends on the quality of your electrical supply and local conditions.

Do you suffer black outs or low voltage events causing electrical equipment to stop or act erratically? If so a UPS may be in order.

Do you suffer lightning strike damage or have regular lightning storms? If so then lightning protection may be in order?

Do you suffer from harmonic distortion or poor power factor? If so a power conditioner may be in order?

Do you just want to protect against voltage spikes caused by electrical noise sources? If so surge protection may be in order?

What does the manufacturer recommend given your power situation to protect the equipment?

If you want to protect from all you would possibly use an independent generator fitted with surge protection to power your equipment, but this is expensive and potentially not a viable solution for your application.

The electrical specifications of the machine will indicate the insulation protection level of the equipment, and recommended supplemental protection. This sort of information is highly dependent on the actual equipment, components used and power circuit design. The best location for this protective equipment is as close as possible to the machine terminals. The protection may be included already.

Indiscriminately applying surge protection could negatively affect your equipment, so a consult with the electrical engineer of the machine manufacturer could avoid future problems.

Standard upstream protection would be distribution class surge arresters, applied at your higher distribution voltage, like 2.4kV to maybe 11kV. The voltage rating and surge capacity will be most affected by your power system design and installation. Power system grounding, electrical and physical distance from outside conductors or other typical exposure, other fast opening breakers in your power system, or other devices that can create switching transients. IEC 60099-4 has specifications for this equipment 5kA class is likely sufficient for your equipment, again, applied as close as you can get it to the equipment, like step down transformer primary connections.

This actually depends on what part of the world you are in as given your ID, I guess it is not Europe or US. One thing forgotten is that not all systems are the same. Here, people post on what they are used to as a system of supply.

And I know from the frequency you are in an IEC or equivalent standard country so what the US uses is not applicable. If it is surges from a line, 10kA is fine. If you are in a high lightning area, you may require higher ratings of 20-30kA or even 100kA.

So, what location are you in, in order to obtain meaningful info.

As an example, a transient on a 480 V line that lasts for 20 microseconds can rise to almost 3400V.