AI- What AI can do and What AI Can't

 

Artificial Intelligence (AI) is a buzzword that has been gaining significant traction over the last few years. Hailed as a revolutionary technology, it has the potential to transform almost every industry from healthcare to finance, transportation to entertainment, and agriculture, energy and document security. AI has been the subject of numerous discussions, debates, and controversies, and it will certainly look different next week than it does today, but in our current world, what can AI do, and what are its limitations?

What AI Can Do

Automation: AI can automate repetitive and tedious tasks, such as data entry, quality control, and testing, freeing up time for employees to focus on more strategic and creative tasks. Automation can improve productivity and reduce costs, particularly in industries such as manufacturing, logistics, and customer service.

Prediction: AI can analyze vast amounts of data and identify patterns, making predictions about future events with a high degree of accuracy. This capability can be applied in various fields, from weather forecasting to stock market predictions.

Personalization: AI can personalize products and services, tailoring them to individual preferences, needs, and behavior. This capability is particularly valuable in marketing, where AI can analyze customer data to make personalized recommendations and improve the customer experience.

Image and speech recognition: AI can recognize and classify images and speech, which has applications in security, healthcare, and entertainment. For example, AI can analyze medical images to detect diseases or assist in surgical procedures.

Language processing: AI can process and analyze natural language, enabling chatbots, virtual assistants, and other communication tools to respond to user queries, requests, and commands.

What AI Can’t Do

Creativity: AI can generate new ideas, but it lacks the creativity and originality of human beings. AI can mimic human creativity, but it cannot replicate it.

Emotional intelligence: AI lacks emotional intelligence and empathy, which are essential for understanding human emotions and behavior.

 This limitation means that AI cannot replace human interaction in fields such as counseling, therapy, or social work.

Judgment: AI can make decisions based on data, but it cannot make ethical or moral judgments. AI lacks the ability to consider the broader social, cultural, and ethical implications of its decisions.

Common sense: AI lacks the common sense and intuition that humans possess. AI can make mistakes, particularly when dealing with unusual situations that require human judgment and experience.

Contextual understanding: AI lacks the ability to understand the context of situations, particularly when dealing with ambiguous or complex situations. 

AI can misinterpret data, leading to incorrect decisions.

AI is a powerful technology that can automate tasks, make predictions, personalize products and services, and analyze data. However, it has limitations in areas such as creativity, emotional intelligence, judgment, common sense, and contextual understanding. AI is a tool that can augment human capabilities but cannot replace them. Understanding the capabilities and limitations of AI is crucial for businesses and individuals who want to leverage this technology to their advantage.

Babatunde Mutiu Kolawole (10 10)

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Capacitor Charging in Transmission Lines

 

In the world of Power systems, transmission lines are unsung heroes, carrying bulk energy across vast distances. But have you ever wondered why capacitors charging current plays such a critical role in their operations?

What is Capacitor Charging Current? Transmission lines inherently behaves like Capacitors due electric field between and around the conductors. When the voltage is applied, the line "Charges" just like capacitor, the charging current flows even when no Load is connected.

What are the Effect?

Voltage regulation: Unchecked charging current can lead to voltage rise at the receiving station causing insulation stress.

Power Losses: Charging current usually contribute to Energy Losses especially in the long and high - voltage lines.

System Stability: Managing these currents is key to maintaining grid  stability.

How do we manage it?

Reactive Compensation by using Shunt Reactors to offset  the capacitive effect

Optimal Line Design: Minimizing line Capacitance through Design

Operational Strategies: Effective Switching Schemes during light load Condition

The world is going Automation: Power Automation quickly detect and most times rectifies,  isolating the affected part, so that proper corrective maintenance can be carried out by the utility company!

NOTE: None of the above can be achieve if Standard of Engineer, Equipment,  Materials and Process are compromised!

Enough of National Grid Collapsing in Nigeria            

Understanding Solar Panels

 

Understanding Solar Panels 

Solar panels have become a popular and sustainable energy solution for many around the world. Whether you're considering them for residential, commercial, or industrial use, understanding how they work and their benefits is essential. Here’s a comprehensive guide to help you grasp the basics of solar panels.

How do Solar Panels work 

Solar panels, also known as photovoltaic (PV) panels, are devices that convert sunlight into electricity. They are made up of numerous solar cells, usually composed of silicon, which absorb sunlight and generate an electric current through the photovoltaic effect.

Type of Solar Panels 

Monocrystalline Solar Panels: Known for their high efficiency and sleek appearance, these panels are made from single-crystal silicon and perform well in low-light conditions.

 Polycrystalline Solar Panels: Made from silicon fragments, these panels are cost-effective and have a slightly lower efficiency compared to monocrystalline panels.

Thin-Film Solar Panels: Lightweight and flexible, these panels are suitable for diverse applications but generally have lower efficiency and a shorter lifespan.

Benefit of Solar Panels 

Renewable Energy Source: Solar energy is abundant and inexhaustible, reducing reliance on fossil fuels.

Cost Savings: Over time, solar panels can significantly reduce or eliminate electricity bills.

Environmental Impact: Solar energy production generates no greenhouse gas emissions, contributing to a cleaner environment.

 Energy Independence: Solar panels provide energy security and can be especially beneficial in remote areas.

Challenges & Consideration 

Initial Cost: The upfront cost of solar panel installation can be high, although incentives and financing options are available.

Weather Dependent: Solar panels' efficiency can be affected by weather conditions and geographical location.

Space Requirements: Adequate roof or ground space is necessary for installation to capture sufficient sunlight.

 

 

Maintenance and Longevity 

Solar panels are generally low-maintenance, requiring periodic cleaning and inspections to ensure optimal performance. Most panels come with warranties lasting 25 years or more, ensuring long-term energy production.

Transmission line protection

Transmission line protection

Multi Bus Transmission Line

Multi Terminal Transmission Line

Zone Protection 

As you already know, the real purpose of transmission line protection is to detect faults or abnormal operating conditions and to initiate corrective action. The most common parameters which reflect the presence of a fault are the voltages and currents at the terminals of the protected apparatus or at the appropriate zone boundaries.

The fundamental problem in power system protection is to define the quantities that can differentiate between normal and abnormal conditions

 Relaying Features

1. Reliability

Reliability, in system protection parlance, has special definitions which differ from the usual planning or operating usage. A relay can misoperate in two ways: it can fail to operate when it is required to do so, or it can operate when it is not required or desirable for it to do so.

To cover both situations, there are two components in defining reliability:

1.    Dependability – which refers to the certainty that a relay will respond correctly for all faults for which it is designed and applied to operate.

2.    Security – which is the measure that a relay will not operate incorrectly for any fault.

Most relays and relay schemes are designed to be dependable since the system itself is robust enough to withstand an incorrect trip-out (loss of security), whereas a failure to trip (loss of dependability) may be catastrophic in terms of system performance.

2. Zones of Protection

The property of security is defined in terms of regions of a power system – called zones of protection for which a given relay or protective system is responsible. The relay will be considered secure if it responds only to faults within its zone of protection.

Figure 1 shows typical zones of protection with transmission lines, buses, and transformers, each residing in its own zone. Also shown are ‘‘closed zones’’ in which all power apparatus entering the zone is monitored, and ‘‘open’’ zones, the limit of which varies with the fault current.

Closed zones are also known as ‘‘differential,’’ ‘‘unit,’’ or ‘‘absolutely selective,’’ and open zones are ‘‘non-unit,’’ ‘‘unrestricted,’’ or ‘‘relatively selective.’’

3. Relay Speed

It is, of course, desirable to remove a fault from the power system as quickly as possible. However, the relay must make its decision based upon voltage and current waveforms, which are severely distorted due to transient phenomena that follow the occurrence of a fault.

The relay must separate the meaningful and significant information contained in these waveforms upon which a secure relaying decision must be based. These considerations demand that the relay take a certain amount of time to arrive at a decision with the necessary degree of certainty.

The relationship between the relay response time and its degree of certainty is an inverse one and is one of the most basic properties of all protection systems.

Although the operating time of relays often varies between wide limits, relays are generally classified by their speed of operation as follows:

1.    Instantaneous — These relays operate as soon as a secure decision is made. No intentional time delay is introduced to slow down the relay response.

2.    Time-delay — An intentional time delay is inserted between the relay decision time and the initiation of the trip action.

3.    High-speed — A relay that operates in less than a specified time. The specified time in present practice is 50 milliseconds (3 cycles on a 50 Hz system).

4.    Ultra high-speed — This term is not included in the Relay Standards but is commonly considered to be operation in 4 milliseconds or less.

4. Primary and Backup Protection

The main protection system for a given zone of protection is called the primary protection system. It operates in the fastest time possible and removes the least amount of equipment from service.

On Extra High Voltage (EHV) systems 345kV and above, it is common to use duplicate primary protection systems in case a component in one primary protection chain fails to operate. This duplication is therefore intended to cover the failure of the relays themselves. One may use relays from a different manufacturer, or relays based on a different principle of operation to avoid common-mode failures.

The operating time and the tripping logic of both the primary and its duplicate system are the same.

It is not always practical to duplicate every element of the protection chain. On High Voltage (HV) and EHV systems, the costs of transducers and circuit breakers are very expensive and the cost of duplicate equipment may not be justified.

On lower voltage systems, even the relays themselves may not be duplicated. In such situations, a backup set of relays will be used. Backup relays are slower than the primary relays and may remove more of the system elements than is necessary to clear the fault.

5. System Configuration

Although the fundamentals of transmission line protection apply in almost all system configurations, there are different applications that are more or less dependent upon specific situations.

5.1 Operating Voltages

As voltage ratings in Nigeria, Transmission lines will be those lines operating at 132 kV and above, subtransmission lines are 33 kV to 132 kV, and distribution lines are below 33 kV. These are not rigid definitions and are only used to generically identify a transmission system and connote the type of protection usually provided.

The higher voltage systems would normally be expected to have more complex, hence more expensive, relay systems. This is so because higher voltages have more expensive equipment associated with them and one would expect that this voltage class is more important to the security of the power system.

The higher relay costs, therefore, are more easily justified.

5.2 Line Length

The length of a line has a direct effect on the type of protection, the relays applied, and the settings. It is helpful to categorize the line length as ‘‘short,’’ ‘‘medium,’’ or ‘‘long’’ as this helps establish the general relaying applications although the definition of ‘‘short,’’ ‘‘medium,’’ and ‘‘long’’ is not precise.

A short line is one in which the ratio of the source to the line impedance (SIR) is large (>4 e.g.), the SIR of a long line is 0.5 or less and a medium line’s SIR is between 4 and 0.5.

It must be noted, however, that the per-unit impedance of a line varies more with the nominal voltage of the line than with its physical length or impedance. So a ‘‘short’’ line at one voltage level may be a ‘‘medium’’ or ‘‘long’’ line at another.

5.3 Multiterminal Lines

Occasionally, transmission lines may be tapped to provide intermediate connections to additional sources without the expense of a circuit breaker or other switching device.

Such a configuration is known as a multi terminal line and, although it is an inexpensive measure for strengthening the power system, it presents special problems for the protection engineer.

The difficulty arises from the fact that a relay receives its input from the local transducers, i.e., the current and voltage at the relay location.

SAFETY IN POWER OUTAGE

Introduction

The nature of the danger posed by the electricity depends on various factors. Unlike the standard safety precautions during the normal electricity supply, the safety precautions before, during and after a power outage may differ from one situation to the other. This may also be influenced by the duration of the outage, the cause and environmental factors such as flooding, earthquakes and others.

The nature of the danger posed by the electricity depends on various factors. Unlike the standard safety precautions during the normal electricity supply, the safety precautions before, during and after a power outage may differ from one situation to the other. This may also be influenced by the duration of the outage, the cause and environmental factors such as flooding, earthquakes and others.

Safety before the electric power interruption

Recommended usage and precautions

During the normal operation, observe all the necessary safety precautions associated with electricity. Use recommended installation procedures and accessories, use the right equipment and ensure any broken item is repaired and maintained as per the standards. Consumers should maintain their electrical equipment and installations in order to prevent dangers such as fires and electric shocks. 

Visual inspections and appropriate tests should be carried out regularly.

•             Ensure that all your equipment and installation is sound. No exposed conductors and if any call a professional electrician to repair these.

•             Avoid touching the live conductors

•             Switch off all equipment not in use from the wall socket, or better still, unplug from the wall.

•             Do not leave electrical equipment such as ironing box, heaters and other dangerous equipment unattended. This could cause a fire or burn someone else in the household.

•             Remove all tools such as grinders, drilling machines from the socket after every use.

•             If you experience unstable power most of the times, consider protecting your computers, DVD players, and TVs and other sensitive electronics with a surge protected power bar.

Prepare for the a power outage

A power outage or blackout refers to the short-term or long-term loss of electricity supply. The nature of the power outage depends on the cause and how fast this is rectified. Some outages may take days to fix, especially if the substations and transmission lines are damaged.

Since you do not know when the outage will occur apart from when there is a scheduled interruption, be prepared all the times. This ensures that you are safe in the event that an outage occurs. Some of the precautions to take include having;

• Emergency lighting, candles, rechargeable lights, etc. keep these in a place where anyone can reach them with ease during a blackout.
• Ensure that the electric gate or doors have a manual operation mode. If anticipating the outage, switch all of them to manual.
• If you have a backup generator or inverter, ensure that they are functioning and have the fuel or fully charged batteries respectively.
• Always keep a torch with good batteries within reach.
• Enough fuel in the car just in case the fuel stations are affected
• Enough firewood or gas heaters just in case you require to heat the space.
• Heat water and cook in advance. Keep the hot liquids thermal flasks and cover the food with thermal covers.
• Your phones fully charged

Safety during the electric power outage

• Check if you are the only one affected, confirm that the circuit breakers have not tripped. If there is nothing wrong with your installation, report the outage to the utility company.

• Turn off all electrical appliances and tools, electronic equipment, computers and any other load connected to power. Turn off these from the wall sockets or unplug them if possible. This prevents equipment damages from power surges during the power restoration. In addition, this reduces the load on the power lines during the restoration exercise. You leave one light to show you when the power is back.

• If you have a backup generator or battery-based inverter, ensure that their installation and usage complies with the manufacturer’s guidelines. Engage a qualified electrician to install the systems and ensure that the power goes through approved transfer panel and switch.

• Operate the generator outdoors

• If the installation is not done to accommodate the generator, connect the loads directly to the generator using properly rated extension cords.

• If is a major problem, switch off the main switch.

• Do not open the fridge, freezer or cold rooms unless it is absolutely necessary. This will ensure that any perishables will continue to be fresh during the outage.

Safety after a power outage

• When the power resumes, you may need to observe it for a few minutes before turning on your most sensitive equipment. In some cases, the power is usually unstable immediately after it has resumed. If there are faults along the lines, the voltage may be lower than normal and some equipment such as motors may try to draw more current which can damage the windings. Therefore, wait for the power to stabilize before turning on everything.

• To be safe do not turn on all your electrical appliances, instead start with only those that you need and those that are not very sensitive. While at it, it might be a good idea to first confirm that the equipment are still operation and that they were not damaged by the interruption. Switch on the equipment one by one and remove the in operational equipment so that they can be checked by a qualified professional.

• Reset the equipment clocks and other settings that may have lost their timings or memory due to the failure. Check the timers for the sprinkler system, alarms, clocks, swimming pool pump, security lights and more.

• Check the food stored in the fridge for signs of spoilage, and throw away if spoilt.
  Ensure that the hot water system is full before powering it on.

• If there was flooding, do not enter flooded areas such as the basement until you are certain that all the power is turned off.

• Have all the flooded electrical appliances, panels, switch boxes, outlets and any connection checked and cleaned before using them.

Conclusion

Electricity plays a very big role is our lives, from powering our electronics, phones and other domestic equipment, to medical, manufacturing and public utilities.

Despite its positive contribution, there are several dangers associated with the electricity, and especially when there are faults or when people do not observe safety measures. Consumers should be aware of the dangers that arise from incorrect usage, faulty machines, outages as well as environmental factors such as floods.

Wiring Project

Electrical wiring project: which problems?

In electrical wiring project, like many others type of projects, it is common to be discouraged and find yourself deeply stressed about final results. Too much stress can lead to inappropriate and bad quality works. It is therefore important to know what to do in such situations.
We are going to talk about some of the problems causing by the stress in an installations including Machines, and after what to do to overcome those.

It is not about errors but technical problems encounter by electricians in the field. These are few of them:

External problems

It can come from client’s modifications and expectations or environmental changes.

Constant changes: 

This is the nightmare of an electrician. It can be an advance of deadline, a suspension of a work, a modification of the entire wiring. This is one of the most common sources of stress for a technician, because he does not know exactly what the client wants and start worry about the project frequently: What is next? Should I resize the cables, control panel and breakers?

No or bad adjustment of the site:
Sometimes the site it is not well prepared for the work and workers. In some countries there is not even water on the site; people are obliged to make long distance in order to get some. And even when you are aware of the problems presents in the site, you cannot predict their extension or depth.

Move to smart electrical installations during the project: 
Homeowners like that. The thing is that when you propose them some of those new technologies early in the proposal, they are not always interested but they enjoy asking that after and it can become stressful even when you are not the one who will add it.
There are many smart appliances out there which can help the customers to build a smart electrical installation but at some point they might require changes in electrical installations but such change lead to a delay in the work with a risk of continuous changes.

Internal problems
These are what the electrician do himself in the field with direct repercussions.

Bad estimation cost of materials:
This is common from newbies or senior technician. when a client give you the money asked for the project, that money it is supposed to covers the cost of material as well as the unexpected problems that may occurs during the installation so be aware of that.

A bad estimation list of materials make you look as an inefficient and non-professional worker; you may intend to use bad/cheap materials or you own money to cover some expenses. It is important to be updated about the new prizes of products in the market.
Although there are estimations like the total length of the wires or the total length of electrical conduits, which are difficult to evaluate, new technicians should approach seniors to help them avoid such stress.

Misinterpretation of the norms and regulations: 
That is why an inspection it is strictly recommended before, during and after the work. If not, when the inspector will come to visit your site, he will ask you to process too many changes which could possibly extend your work schedule and the costs of wiring.

Bad quality of materials or equipment:
It is not always about the prize because bad materials can also be expensive. Experience easily helps to detect bad quality of materials. For example a copper wire should exclusively be in copper; The inner part of that conductor should be in copper not in aluminum and it is sometimes difficult for a newbie to know about that.

Bad cables/sizing can lead to fire, poor/old tool can stop the work. So even when you feel that your equipment still work well, try to change , upgrade to new and easy-to-use technologies.

No or less communication with the building contractor: 
It can seriously delay the work .When for example you are passing corrugated conduits through walls, If not working directly with the building contractor you may be obliged to break the bricks and cover them back on your own.

Underestimation of the project: 

It happens. Very often, actually. It is true that there are some projects which look very similar that what we have done before and we can tend to work in the new project accordingly to the previous one. No do not do that. This is very stressful when it comes to add cables or wires , or buy new tools because of bad preparation .

INSPECTION AND TESTING OF INSTALLATION 1

                                                 

Periodic inspection and testing of internal wiring installations is necessary. Internal wiring should be checked every year for safe operations.

While carrying out inspection and testing of internal wiring installations, following points should be checked:  Incoming Service Line Connection

Check and ensure the following:

1.            Service line coming in to the premises is properly terminated and brought in

2.            Check for fuse wire rating on each of the phases so as to ensure it is of correct rating

3.            Check for wire sizes to be of correct size to carry the required current

4.            Check for earthing to be properly maintained at the service line side

Main Switch Board

A main switch board exists at the point of termination of service line. Supply is provided through this board in to the premises.

1.   Ensure that the main switch board is closer to the point of supply in the premises

2. Check for fuses / circuit breakers used of adequate sizes for all phases

3. Check for correct ON/OFF working of Main Switch. A main switch plays a very important role as it helps to switch off the complete supply of the premises in case of emergency / repairs. It should always be in good working condition.

Check for any mechanical faults in switching operations that might cause it to remain continuously in ON state. This may be problematic in emergency cases when the electrician wants to switch the supply off

4.  Ensure that the Switch board assembly is well covered to protect against rain / weather conditions

5.   Inspect to see that you are clearly able to trace the neutral and earthing wires in different colour

6.            Inspect the electricity meter connections are properly fastened

Internal Wiring Circuits

Internal Wiring Circuits are to be checked for following points:

1.            Ensure that each circuit branching out of Main Switch board has a connected load of not more than 800 watts or 10 points

2.            Test for Insulation resistance of conductor and earth to be as per IEC specifications

3.            Electrical resistance from connection with Earth electrode should not be more than one ohm

4.            Ensure metallic covering of iron clad switches, distribution boards are properly earthed

5.            Test that that leakage current is less than 1/5,000 of maximum supply current.

Key Tests to be performed for Wiring Installations

1.            Insulation Resistance Test:

In this test, the insulation resistance of a wire is tested to ensure that there is no leakage current flowing through it. As per IE rules, the insulation resistance between wiring and earth should not exceed 1/5,000 of the current flowing through it.

The test is performed using “Megger” instrument. In this, main switch is put in OFF condition and all the lighting connections on the circuit are short circuited. The Megger is connected between line and the earth. Megger is then rotated to generate voltage and then the reading on the dial of Megger is noted

The insulation resistance should not be less than 50 Mega-ohm divided by no. of circuits. The insulation resistance per circuit is calculated as 50 Mohm. If the result value is more than 1 then it should be considered as 1 mega-ohm. In no case this value should be less than 0.5 mega ohm.

2.            Earth Continuity Test:

This is second most important test for safety of installation.

All metal clad switches, metal parts, covers, conduits must be solidly connected to earth. In absence of this, there could be a severe damage to the whole electrical installation, appliances connected to it. In adverse events, the leakage current flowing through it may cause severe electrical shock to the person coming in physical contact with it.

In order to test this, the main switch should be in open position. All other circuit contacts like bulbs and switches should be ON position. The Earth continuity tester is then connected between the switch / conduit and an independent earth. The tester will indicate the value of resistance. In all cases the value should not exceed more than 1 ohm. If the value appears higher than 1 ohm it indicates that the switch / conduit is not properly earthed.