What is single line diagram of substation?

The single line diagram (SLD) is the most basic of the set of diagrams that are used to document the electrical functionality of the substation. Typically, single line or one line diagrams are used to document the configuration of the electrical high voltage circuit of a substation.

What is the function of single line diagram?

As the name suggests, a one-line chart uses a single line to represent all three phases. This is the most basic type of electrical installation blueprint. A single line diagram shows the rating and capacity of electrical equipment and circuit conductors and protection devices.

How do you draw a single line diagram?

Calculation Procedure in 8 steps

1. Establish Base Voltage through the System.
2. Calculate the Generator Reactance.
3. Calculate the Transformer Reactance.
4. Calculate the Transmission-Line Reactance.
5. Calculate the Reactance of the Motors.
6. Draw the Reactance Diagram.
7. Calculate Operating Conditions of the Motors.

What is the 33 11kv substation equipment?

Power substation consists of: Switchgear: isolators, circuit breakers, earthing switches etc. Controlgear: current transformers, voltage transformers, contactors etc. Protection equipment: relays, fuses, surge arrestors etc.

What is the current in 11kV line?

Take a 11kV/415v, 500KVA distribution system. Then maximum current on HV side = 500/{sqrt(3) * 11} = 26.24 A. maximum current on LV side = 500/{sqrt(3) * 0.415} = 695.6 A.

What is the difference between 33kV and 11kV?

The 11kV lines are used in residential areas and is what feeds the local transformers, which then distributes power to the buildings in the area. 33kV lines on the other hand involve much higher voltages and are used to distribute power from one small sub-station to another.

What is single line diagram explain with example?

The Single Line Diagram (SLD) is considered as an essential tool for the electrical professional. The SLD is the blueprint for electrical system analysis. It represents a three-phase power system. It is a form of the block diagram which conveys the paths for power flow between different entities of the system.

What is the difference between one-line diagram and impedance diagram?

Explanation: Single line diagram is a representation of balanced power system on per phase basis with neutral eliminated. In impedance diagram different power system elements are represented by symbols. Explanation: In reactance diagram different power system elements are represented by their symmetrical networks.

What is a one line electrical drawing?

A single line diagram, also referred to as a one-line diagram, is usually a single page document that represents a facilities electrical distribution infrastructure. It will have one single line shown for bus (or cable) to represent all three phases.

What is a 3 line diagram?

Three-line diagrams expand on the single-line by providing a basic visual guide for actual feeder cabling, instrument transformer connections, and protective devices. These drawings show how phases are wired and specific winding configurations without regard for their physical location.

What is the difference between 11kV and 33kV?

Which circuit breaker is used in substation?

Air circuit breakers are commonly used in electrical distribution systems. Air circuit breakers which include operating mechanisms that are mainly exposed to the environment. ACB is also protecting for over load, short circuit and earth fault. Most of air circuit breakers are use in indoor type substations.