HandasaTac

Engineering, Study of Elegancy ⚙ Open to Everybody

[HandasaTac @HandasaTacEng]

HandasaTac has an Arabic account under the name @HandasaTac

[HandasaTac @HandasaTacEng]

Wood is classified to Hardwood, produced from deciduous trees which lose their leaves annually, and Softwood produced from coniferous trees which remain green throughout the year. (Normally) Hardwood sustain more weights without damage so it is used to carry heavy equipment.

[HandasaTac @HandasaTacEng]

Steel Pipe Racks are used in industrial environments & power plants to support, and carry, Electrical cables & Mechanical apparatuses. They come in different shapes and normally are designed with enough spacing to allow maintenance teams to reach the cables whenever required.

[HandasaTac @HandasaTacEng]

Zero Liquid Discharge (ZLD) is a known process to re-treat all the discharged liquids of industrial processes & produce clean water in economic & environmental manner. The complexity of ZLD plants make them not feasible for all industries, especially due to the high capital cost.

[HandasaTac @HandasaTacEng]

Every Mobile Crane has a Crane Load Chart indicating maximum weight the crane can carry at different lenghts of its arm (boom) & different angles wrt ground. Crane operators must comply with the chart to avoid losing balance & causing the crane to fall down !

[HandasaTac @HandasaTacEng]

Oil cooled Electrical Transformers are filled with dry Nitrogen, or dry air, with pressure slightly higher than atmospheric pressure during shipping to prevent humid air from reaching the cellulose paper that is insulating the transformers' windings.

[HandasaTac @HandasaTacEng]

The process of properly arranging Electrical conductors within a panel & placing them inside dedicated trunks/conduits is known as "Cables Dressing".

[HandasaTac @HandasaTacEng]

Don't forget that solving AC Electric Circuits (i.e. Finding voltage & current values) using KVL & KCL knowing that the inductor reactance is 2πfl & capacitor reactance is 1/2πfC will only result in the Steady State behaviour of the circuit without the Transient behaviour.

[HandasaTac @HandasaTacEng]

4- AC-4: The red curve-> Heart failure, burns, cellular TPV، respiratory stroke, & the chance of ventricular fibrillation increases as the electric current increase.

[HandasaTac @HandasaTacEng]

The Standard IEC 60479-1 defines 4 regions for the effect of Electric current-time (Shown in the image) flowing over the human body, if it enters from the left hand & exits from both feet:
1- AC-1: Upto 0.5mA -> No Effect.
(Cont)

[HandasaTac @HandasaTacEng]

3- AC-3: The Yellow Curve-> Intense muscles contraction, breathing difficulty, possibility of temporary heart muscle failure, temporary loss of the ability to move, but no organic failure is expected.
(Cont)

[HandasaTac @HandasaTacEng]

Examples of Shunt "FACTS"
1- Static Synchronous Compensator (STATCOM)/(STATCON)
2- Static VAR Compensator (SVC), its examples:
- Thyristor-controlled reactor (TCR)
- Thyristor-switched reactor (TSR)
- Thyristor-switched capacitor (TSC)
- Mechanically-Switched capacitor (MSC)

[HandasaTac @HandasaTacEng]

The "FACTS" System is a short for Flexible Alternating Current Transmission System. It is a combination of Electronic & Linear Electrical components connected to Transmission lines in Series, or as Shunts, to improve the reliability & quality of the Electric Network. (Cont.)

[HandasaTac @HandasaTacEng]

Examples of Series "FACTS" include:
1- Static Synchronous Series Compensator (SSSC)
2- Thyristor-Controlled Series Capacitor (TCSC)
3- Thyristor-Controlled Series Ractor (TCSR)
4- Thyristor-Switched Series Capacitor (TSSC)
5- Thyristor-Switched Series Reactor (TSSR)
(Cont)

[HandasaTac @HandasaTacEng]

An important specification when selecting a non-active rectifier separately or as part of a Variable Frequency Drive (VFS) or Uninterruptible Power Supply (UPS) is its number of pulses which determines the input line harmonics & size of filtration capacitors as shown in the image

[HandasaTac @HandasaTacEng]

The skin effect occurs in AC circuits where the higher the circuit's frequency, the more the current concentrate at the perimeters of the wire making a portion of it unusable and larger wire size required compared to DC circuits. Stranded wires are used to limit this effect.

[HandasaTac @HandasaTacEng]

Level 3 Analysis of Capital Investment:
High value Investment opportunities are identified with a timeline to reach pay back period along with required Engineering details.

[HandasaTac @HandasaTacEng]

Energy Audit is an analysis of Energy flow & availability in buildings. It includes finding solutions to reduce energy input to a system without negatively affecting it's output. The audit is the first step for an organisation to explore energy saving opportunities (Cont.)

[HandasaTac @HandasaTacEng]

Level 2 Detailed Audit:
As a continuation from previous levels, Simulation (normally through softwares) is done to evaluate energy consumption & flow in the building. (Cont.)
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