Substation earthing design pdf

The earthing system must be designed using latest version of the cdegs design software package. Substation and transmission lines earthing system design under substation fault. Pdf earth mat design for 233kv substation in rivers. Hence substations in general can be considered as heart of overall power system. Substation earthing system design optimisation through the. If the earthing design tool cannot connect to the sql server that holds the tool data the message below is displayed with the option to close the tool. Substation earthing design akshay patil electrical and electronics engineering, navrachana university, india abstract. All intellectual property rights including without limitation any, patents, logos, designs, circuit layouts, trademarks, moral rights and know how in the. The earthing grid for substation shall be designed in terms of is. Design of earthing system for new substation project citeseerx.

The earthing design tool will start and connect to the backend database as shown below. Important formulas for designing a substation grid earthing system. Earthing system is made of a mesh of buried bare copper cable, with additional earth rods, and shall be calculated, being recommended to use ieee std. The main purpose of this work is the development of an optimization model for the design of the grounding grid in electrical substations. Safe earthing system, ac outdoor substation, earth grid design. The goal of this paper is to be a safe earthing system for substations. This paper presents the design of earthing systems for the 233kv substation in rivers state of nigeria. Substation and transmission lines earthing system design.

Today we are going to discuss the design of substation earthing system. Pdf grounding system design in electrical substation. Design of earthing system for new substation project 66kv. A good grounding system is one that provides low resistance to earth which in turn minimizes the ground potential rise. Introduction this paper is concerned with earthing practices and designs for outdoor ac substation include distribution substations. Earth resistance substations because of space saving on the ground level due to substantial reduction. Before 1960s the design criterion of substation earthing system was low earth resistance.

Construction of 3311kv substation technical specification page 6 of 211 rev. Pdf earth protection system, also known as grounding system, is to protect the equipment in the substation by providing low impedance path. The legacy approach to secondary substation earthing design was based on one or two earth rods and combining hv and lv earths if the measured earth resistance was less than 1 ohm. User guide secondary substation earthing design tool icp. Ieee std 811983, ieee guide for measuring earth resistivity, ground impedance. The cross section of the buried cable should calculated in accordance with the value of the phasetoearth short. The problem is formulated as a mixedinteger linear.

Successful operation of entire power system depends to a considerable extent on efficient and satisfactory performance of substations. The enclosure will have a solid top, screened bottom, side covers, and top. His paper is concerned with earthing practices and design for outdoor ac substation include distribution, transmission substations for power frequency in the. Pdf design of safety critical substation earthing system based. Design of earthing grounding system in a substation grid. Ieee guide for safety in ac substation grounding ieee std 802000. These rules relied on metallic sheathed cables providing a grading effect hence controlling. Ieee std 811983, ieee guide for measuring earth resistivity, ground. Power systems analysis and design br gupta power systems earthing. Ieee guide for safety in ac substation grounding ieee std. We have already given an introduction to substation earthing system in an article published earlier.