Earth protection system for AC substation
The earth protection system, also known as grounding system, is to protect the equipment in the substation by providing low impedance path for fault current flow to the earth. In addition, this system plays a significant role in safety assurance of the personnel working within or nearby of the st...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/68747 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The earth protection system, also known as grounding system, is to protect the
equipment in the substation by providing low impedance path for fault current flow
to the earth. In addition, this system plays a significant role in safety assurance of the
personnel working within or nearby of the stations. In order to meet the power
system performance and electrical safety, the earth resistance needs to be low enough
for the required level of fault current to flow. Also, dangerous potential gradient of
fault current should not arise to any metal or conducting equipment from the ground.
As Singapore has underground power transmission and distribution system, earth
protection is vitally important. The objective of this dissertation is to analyze the
schemes of earth protection system with its different parameters, and associated
effects in the AC electrical substations in Singapore geographical areas.
In order to analyze the scheme of earth protection system, calculations on earth
conductor sizing, scheme resistance, the criteria and permissible imposed touch and
step voltage levels have been conducted. Local authorities’ standard requirements
and guidelines of typical AC substations in Singapore are also presented. Equations
and Matlab simulations on case study examples have been generated to determine the
design scheme achieve the safety level. |
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