Transformer Sld Diagram

3 phase 315 mva 16 5 400kv.

Transformer sld diagram. For example if the sld is used in the initial stages of designing a substation then all major equipment will be included in the diagram major equipment being transformers breakers disconnects and the buses. Such transformer has two winding i e. This is the basic of a single line diagram. In a delta connected dd group of transformers the line voltage v l is equal to the supply voltage v l v s but the current in each phase winding is given as.

Bfp ahp and chp aux transformers lightning and welding transformers etc. The purpose of single line diagram is to show sources of power electrical equipment electrical drives system details and fault levels. 1 3 i l of the line current where i l is the line current. The notation of the sld components are as follows.

In power engineering a single line diagram sld also sometimes called one line diagram is a simplified notation for representing a three phase power system. This is sld single line diagram representation of single phase two winding transformer. What is a single line diagram sld. 30 behind of the zero hour position of the hv line phasors.

As shown in the above figure the transformer is having 3 phases on hv side 1u 1v 1w and 3 phases on lv side 2u 2v 2w. Primary and secondary both used by the single phase. Examples shown on the sld are 14 400 v 120 v a ratio of 120 1 or 4200 v 120 v a ratio of 35 1. The one line diagram has its largest application in power flow studies electrical elements such as circuit breakers transformers capacitors bus bars and conductors are shown by standardized schematic symbols.

It is very versatile and comprehensive because it can depict very simple dc circuits or a very complicated three phase system. A poly phase transformer with hv winding in delta lv winding in star with neural and the lv line phasor 1 o clock i e. The station transformer derive power from ehv buses and deliver to the station buses buses 3 to 6 single line diagram of power plant. Single line diagram sld we usually depict the electrical distribution system by a graphic representation called a single line diagram sld.

As a layman view sld is nothing but consisting of various components of the electrical system like transformer dg panels consisting of ht breaker lt breaker ct pt. The amount of information included in an sld depends on the purpose for which the diagram is used. Voltage transformers are used to step higher voltages down to safe levels for inputs to relays and meters. The sld shows all pertinent information about the sequence of the circuit but does not give as much detail as a schematic diagram.

One disadvantage of delta connected three phase transformers is that each transformer must be wound for the full line voltage in our example above 100v and for.