What is system earthing?
The term “earthing” consists of several functions which only have “utilizing the earth” in common. Before describing the system earthing, it can be of interest to know a bit about the different types of earthing. Protective earthing is applicable mainly in electronic equipment to prevent damage or errors at the components.
How system earthing keeps you and the network safe
How system earthing keeps you and the network safe (photo credit: EEP)
Example of protective earthing is when a screened cable is earthed, or when an incoming signal conductor is connected to earth through a capacitor or a filter.
Protective earthing can be described as a way of protecting man from dangerous voltages. Example of protective earthing is, when the casing of e.g. a washing machine is connected to earth (green/yellow conductor) or when a row of switchgear cubicles are connected to an earth conductor, which connects the cover of the cubicle to earth.
Lightning protection can also be a part of system earthing. System earthing concern the kind of deliberate measures that connects a normally live system to earth. It is normally the zero point of the system that is connected to earth but other solutions can occur.
Of course, all types of systems can be earthed, and the terminology “system earthing”, can thus be used. Systems like electronic systems and battery systems, measuring transformer circuits etc., are often earthed. In the following text we will only consider system earthing of alternating current (AC) systems for power distribution and transmission, with a voltage over 150 V.
If a point in a system is earthed the whole system will be earthed as far as the galvanic connection goes. A system earthing on the contrary does not affect the parts of the network that are connected magnetically to the earthed part of the network, for example through transformers. See figure 1.
The earthing of a system is effective for all galvanic connected parts
Figure 1 – The earthing of a system is effective for all galvanic connected parts
Example of protective earthing is when a screened cable is earthed, or when an incoming signal conductor is connected to earth through a capacitor or a filter.
Protective earthing can be described as a way of protecting man from dangerous voltages. Example of protective earthing is, when the casing of e.g. a washing machine is connected to earth (green/yellow conductor) or when a row of switchgear cubicles are connected to an earth conductor, which connects the cover of the cubicle to earth.
Lightning protection can also be a part of system earthing. System earthing concern the kind of deliberate measures that connects a normally live system to earth. It is normally the zero point of the system that is connected to earth but other solutions can occur
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Hairstyles Women
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