Discussion on grounding of 10kV motors
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Is it possible to share the grounding system for the 10kV motor’s enclosure with the grounding network formed using the building foundation, or is it necessary to install a separate angle steel framework for grounding? Everyone is welcome to offer as many suggestions as possible
By the way, in your work with central air conditioning systems, you also use centrifugal compressors that utilize 10KV motors. Could you give me some advice?
The ground wire is connected to the earth; it’s fine. Given the actual circumstances, it’s better to install a ground wire by oneself
Of course. It’s essentially one continuous grounding network; isn’t your foundation also connected to the main grounding network?
The casing grounding of 10 kV motors is considered protective grounding. Inside the junction box of 10 kV motors, a separate grounding screw is provided and clearly marked with a grounding symbol. This grounding point is connected to the steel armor or shielding layer of the 10 kV cable, which then leads back to the high-voltage switchgear room. Perform lightning and static electricity grounding on-site (install grounding electrodes separately; three per group ； It also utilizes various reinforcing bars running up and down within the columns of buildings to connect to the motor housing. This grounding still falls under protective grounding. In the event that the steel armor or shielding layer gets damaged, this grounding serves as a backup protective measure; it can thus be regarded as backup protective grounding.
The general design approach nowadays is to use a common protective grounding system for the entire plant, ensuring that the overall grounding resistance is less than 1 ohm. Unless certain measuring instruments have special requirements regarding the working location, etc
I won’t create separate grounding electrodes for you anymore; instead, a grounding grid will be utilized based on the building’s foundation, with all areas of the plant connected to each other. This includes the grounding of the power distribution room (an independent grounding electrode must be present around the power distribution room that contains transformers)