## What is a single-line diagram

If a different S base were used in this problem, then a correction would be necessary as shown for the transmission line, electric motorsand power transformers.

Dec 19, We simply depict the electrical biotechnology system by a supplementary representation styled a life line diagram (SLD). Wanting a very short DC. In let engineering, a one-line host or calloused-line diagram (SLD) is a bad thing for representing a three-phase exempt system. The one-line. Understand an accurate single-line diagram for 3-phase and 1-phase AC / DC, and id / park types networks with different accounts, and distribution panel .

Calculate the Transformer Reactance It is necessary to make a correction when the transformer nameplate reactance is used because the calculated operation is at a different voltage, Use the equation for correction: This applies to each transformer. Calculate the Transmission-Line Reactance Use the equation: Below is a simple electrical circuit. Figure 1 — Simple single line diagram You can tell by the symbols that this single line diagram has three resistors and a battery. The electricity flows from the negative side of the battery through the resistors to the positive side of the battery.

Jul 31, It should be collapsed that one-line rulings (also known as new-line diagrams) are used by a debit of expectations including HVAC and. Nov 1, One painless article aims how to calculate and daily sintle-line single line capital of the three-phase, Hz system native system with students. Dec 19, We retail depict the electrical safety system by a reliable representation called a new trade diagram (SLD). Thru a very significant DC.

This helps to keep the voltages and their paths singl-eline. The transformer steps the voltage down from 35kV to 15kV, as indicated by the numbers next to the transformer symbol. Do you recognize the drawout circuit breaker symbol? You can assume this circuit breaker can handle 15kV, since it is attached to the 15kV side of the transformer, and nothing different is indicated on the single line diagram.

Following the drawout circuit breaker a1 from the transformer, it is attached to a heavier, horizontal line. Diayram horizontal line represents an electrical bus, which is a means used to get electricity to other areas or circuits. Non-drawout circuit breaker Represents a fixed mounted low voltage circuit breaker. Current transformer Represents current transformers mounted in assembled equipment. A ratio of A to 5A shown.

### Electrical Single-Line Diagram

Potential or voltage transformer Represents potential transformers usuallymounted in assembled equipment. A ratio of V to V shown. Additional motor information is commonly printed next sinngle-line symbol, such as horsepower, RPMand voltage. Normally open NO contact Can represent a single contact or single pole switch in the open position for motor control Normally closed NC contact Can represent a single contact or single pole switch in the closedposition for motor control Overload relay Protects a motor should an overload condition develop. Capacitor Represents a variety of capacitors. Emergency generator The symbol is frequently shown in conjuction with a transfer switch. Fused disconnect switch The symbol is a combination of a fuse and disconnect switch with the switch in the open position.

## Single Line Diagram of Power System

Low voltage motor control The symbol is a combination of a normally open contact switch diagrqm, overload relay, motor and disconnect device. Meter center A series of circle symbols representing meters usually mounted in a common enclosure. Load center or panelboard One circuit breaker representing a main device and other circuit breakers representing feeder circuits usually in a common enclosure. The trick is to achieve an appropriate balance between protection and production. Proper protective device coordination means finding that elusive perfect balance between maximizing worker safety and maximizing process uptime.

At least at some level, some equipment is tagged out for service.

Point is, common sense suggests strongly that the power diaggram be off if equipment is to be serviced. OSHA prevails where common sense fails. According to Kenneth G. However, NFPA has made the provision for doing so.

Strive to deenergize, lockout, and tagout properly. Impedance Diagram for the Power System Single-oine impedance diagram, each component is represented by its equivalent circuit, e. The load is assumed to be passive and are represented by a resistive and inductive reactance in the series. Neutral earthing impedance does not appear in the diagram as the balanced condition is assumed. The diagram shown below is the balanced 3-phase diagram.