1. The document discusses electrical safety topics such as protection devices, residual current devices (RCDs), maximum demand calculations, cable selection, voltage drop, fault loop impedance, and mains earthing neutral (MEN) connections.
2. It provides information on circuit breaker operation, RCD functioning, methods for calculating maximum demand and cable sizing, and guidelines for determining allowable fault loop impedance.
3. The document also outlines procedures for safely isolating circuits, and explains the purpose of MEN connections at the main switchboard to complete an electrical earthing system.
Learn what is a contactor, its components, types and working principle. A contactor is an electrical device that is used to turn on and off an electrical circuit. It is regarded as a unique sort of relay.
Learn what is a contactor, its components, types and working principle. A contactor is an electrical device that is used to turn on and off an electrical circuit. It is regarded as a unique sort of relay.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
Protection of transmission lines (distance)Rohini Haridas
This gives idea about necessity of protection of transmission line and protection based on time grading as well as on current grading. Also includes three step distance protection of transmission line
Electrical fault is the deviation of voltages and currents from nominal values or states. Under normal operating conditions, power system equipment or lines carry normal voltages and currents which results in a safer operation of the system.
To sense/detect the fault occurrence and other abnormal conditions at the protected equipment/area/section.
To operate the correct circuit breakers so as to disconnect only the faulty equipment/area/section as quickly as possible, thus minimizing the damage caused by the faults.
To operate the correct circuit breakers to isolate the faulty equipment/area/section from the healthy system in the case of abnormalities like overloads, unbalance, undervoltage, etc.
To clear the fault before the system becomes unstable.
To identify distinctly where the fault has occurred.
Electrical fuse power point presentation prasantakcs
about electrical fuse powerpoint presentation , described in very short way.., pictures and informations are taken from internet , electrical4u.com is the best website for electrical engineers.. of you have any questions about this presentation, you may comment below..
Circuit BreakersA circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.
Fire Pump Short Circuit and WIC ConsiderationsJames S Nasby
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Short Circuit and WIC Considerations for Motor Driven Fire Pump and Other Motor Controllers.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
Protection of transmission lines (distance)Rohini Haridas
This gives idea about necessity of protection of transmission line and protection based on time grading as well as on current grading. Also includes three step distance protection of transmission line
Electrical fault is the deviation of voltages and currents from nominal values or states. Under normal operating conditions, power system equipment or lines carry normal voltages and currents which results in a safer operation of the system.
To sense/detect the fault occurrence and other abnormal conditions at the protected equipment/area/section.
To operate the correct circuit breakers so as to disconnect only the faulty equipment/area/section as quickly as possible, thus minimizing the damage caused by the faults.
To operate the correct circuit breakers to isolate the faulty equipment/area/section from the healthy system in the case of abnormalities like overloads, unbalance, undervoltage, etc.
To clear the fault before the system becomes unstable.
To identify distinctly where the fault has occurred.
Electrical fuse power point presentation prasantakcs
about electrical fuse powerpoint presentation , described in very short way.., pictures and informations are taken from internet , electrical4u.com is the best website for electrical engineers.. of you have any questions about this presentation, you may comment below..
Circuit BreakersA circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.
Fire Pump Short Circuit and WIC ConsiderationsJames S Nasby
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Short Circuit and WIC Considerations for Motor Driven Fire Pump and Other Motor Controllers.
Bus ele tech_lib_short_circuit_current_calculations (1)ingcortez
LIBRO DE CALCULOS DE DATOS DE CORTO CIRCUITO ELÉCTRICO PARA CONDUCTORES DE COBRE Y ALUMINIO DEL TIPO MONOPOLARES O TRIFASICOS DENTRO DE CANALIZACIONES ELECTRICAS PLASTICAS O METALICAS EN VOLTAJES DE MEDIA Y BAJA TENSION CON FACTORES O CONSTANTES DE LOS CONDUCTORES ELECTRICOS EN METROS
try to make a basic information to design a sub-station and components of sub-station. please comment and give me solution if I had any wrong information.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
8. Residual Current Device RCD Safety Switch LOAD N A/s Supply When the circuit is in good condition. (No Earth Faults) (I active = I neutral) = No Flux = No Induced EMF Supply to the Load is Maintained I A I N
9. RCD with Earth Fault LOAD N A/s Supply When an Earth Faults occurs. (I active I neutral) = Flux in Core = Induced EMF The fault is Isolated
10. Safety Switch N A/s Supply Not Earthed A person can receive a shock with a “Safety Switch” installed Another point to consider: An RCD rated at 40Amps will not trip (like a C/B) if say 52Amps will to flow through the device.
84. The Fault Loop 1. The impedance needs to be low enough, to allow a high enough fault current, to operate the protective device, within a given time period. (6.3.3.2.2) 2. The Earth Loop Impedance is matched to the Protective Device Tripping Characteristics. 3 Phase Supply N/L
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87. Earth System ♦ Z LOOP = Z ACTIVE + Z EARTH + Z NEUTRAL + Z TX ♦ All these will limit current and dictate the fault current that will flow. Load N/L 16A MEN Link must be left intact
98. Earth System Load 16A N/L With 80% of voltage drop here in a fault, the FSC must have 80% of the total Fault Loop Impedance. Where the length and CSA of the mains is not known, we may assume that 80% of the voltage drop under fault conditions will occur in the final sub-circuit (B5.2.1b).
104. But what if the cable/CB size is not there on that table?
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106. Say, 300mm 2 orange circ. cable supplying a 415V, 350A, 3-phase motor through underground conduit 140mtrs away… 7. Measure the actual loop impedance. MAIN SWITCHBOARD Load Z = V/I A V I 5A
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112. Remember the last question? Q: Why do we want a low resistance earth wire? To CREATE a high enough fault current to trip the protective device. To ensure that we do create a high enough fault current, fault loop impedance must be low enough.
114. A Simplified Circuit We need to look at a complete loop (circuit) 3 Phase Supply The current path includes the: Supply Transformer, Distribution System, Mains, Protection Device, Final Sub-Circuit including the Load N/L
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116. 3 Phase Supply There will always be more than 80% of the Nominal Voltage AS/NZ3000:2000 B5.2.1 b Zext Zint Zint = 0.8 Uo I a B5.2.1
122. Recent studies have shown that 95% of electricians do not fully understand the MEN system. This figure comes from the Electrical Contractors Association of Queensland who were conducting training sessions throughout Queensland during 1998. They asked electricians to draw a MEN system and explain it. Only 5% could!!! MEN System
123. MEN Connection Consumer Mains MAIN SWITCHBOARD Circuit Protective Devices Earth Link Neutral Link Main Switch
124. MEN Connection Circuit Protective Devices Consumer Mains MAIN SWITCHBOARD Neutral Link Main Switch So why do we earth the neutral at the board?
125. Load Direct Earthing System 16A Q: Will the fuse blow? FAULT R TOTAL = 23.5 I FAULT = V/R = 240/23.5 10A 0.3 0.2 23
126. Load MEN Earthing System 0.3 0.2 16A R TOTAL = 1 Q: Will the fuse blow? 0.5 I FAULT = V/R = 240/1 = 240A N/L FAULT R RETURN = 0.5//23 0.5 23
127. Q: Why do we want a low resistance earth wire? To CREATE a high enough fault current to trip the protective device.
128. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Earth Link Neutral Link NORMAL LOAD CURRENT Typical Earth stake to Earth resistance = 30 - 2k Main Switch Load Low R Consumer Mains
129. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Earth Link Neutral Link FAULT CURRENT Main Switch Load A Low Resistance earth CREATES A high fault current. Low R
130. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Consumer Mains Earth Link Neutral Link What are the values given by AS3000 on earth resistance? Main Switch Load
131. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Consumer Mains Earth Link Neutral Link 2 maximum 2 maximum Main Switch Load
132. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Consumer Mains Earth Link Neutral Link Main Switch < 0.5 (6.3.3.2.2) Load “ The resistance of the protective earthing conductors shall be low enough to permit the passage of current necessary to operate the overcurrent protective device” (6.3.3.2.2)
134. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Earth Link Neutral Link Load OPEN CIRCUIT MEN Connection
135. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Earth Link Neutral Link NORMAL LOAD CURRENT Everything operates OK!!! Load
136. THEREFORE FAULT CURRENT WILL BE VERY LOW MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Main Switch Earth Link Neutral Link FAULT CURRENT But RESISTANCE TO EARTH IS USUALLY HIGH. Load
137. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Main Switch Earth Link Neutral Link FAULT CURRENT AND PROTECTION WILL NOT TRIP. Load
138. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Main Switch Earth Link Neutral Link FAULT CURRENT NOTE THAT IF ACTIVE IS SHORTED TO EARTH, ALL EARTHS ARE LIVE!!! Load
139. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Main Switch Earth Link Neutral Link FAULT CURRENT NOTE ALSO THAT UNDER NORMAL CONDITIONS EVERYTHING ELSE WILL STILL WORK OK!!! Load
140. Open Circuit MEN Connection MAIN SWITCHBOARD Circuit Protective Devices Neutral Link Sub Mains Sub Mains Neutral Link DISTRIBUTION BOARD 3 Circuit Protective Devices Earthing Bar DISTRIBUTION BOARD 2 Circuit Protective Devices Neutral Link Earthing Bar Main Earthing Conductor Sub Mains Circuit Protective Devices Neutral Link Earthing Bar DISTRIBUTION BOARD 1 Main Switch What happens on Distribution Boards when the MSB MEN link open-circuits ? AS3000 5.6.6b(iv)
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142. MAIN SWITCHBOARD MEN Connection Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link A N LIVEN UP: -Earth stake -Water pipes -Taps -Sink -Cases of appliances Load
143. MAIN SWITCHBOARD Circuit Protective Devices Neutral Link Sub Mains Sub Mains ` Neutral Link DISTRIBUTION BOARD 3 Circuit Protective Devices Earthing Bar DISTRIBUTION BOARD 2 Circuit Protective Devices Neutral Link Earthing Bar Main Earthing Conductor Sub Mains Circuit Protective Devices Neutral Link Earthing Bar DISTRIBUTION BOARD 1 Main Switch What happens on Distribution Boards when Main Active and Main Neutral are swapped? N A
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145. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link OPEN CIRCUIT Neutral Load
146. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link LOAD CURRENT Load
147. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link LOAD CURRENT Load
148. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Lo load Resistance Hi stake - earth Resistance: 30 - 2k Load Voltages... High Voltage Low Voltage High Voltage on Earth System
149. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Lo load Resistance Hi stake - earth Resistance: 30 - 2k High Voltage Low Voltage Livens: -Taps, -Sinks -Water pipes -Metal cases of appliances Load Voltages... High Voltage on Earth System
150. Q: What causes “tingles” on taps? MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link All Loads
151. Q: What causes “tingles” on taps? VD N =4V MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link All Loads
152. Q: What causes “tingles” on taps? MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link All Loads 4V 0V
158. General Requirements Clause No. What to look for 2.9.6 No exposed live parts. E.g. no excessive removal of insulation at terminations, terminal covers in place etc. Double insulation maintained where required. E.g. no single insulation in ceiling above light fittings, no more than 100mm single insulation in wall behind accessories, insulating shrouds installed where required. 1.9 All equipment is approved/compliant with Australian Standards and in good condition. E.g. no unsafe/damaged or non-compliant equipment installed.
159. Consumer Mains Clause No. What to look for 3.4.1 Consumers Mains should be able to carry the maximum demand current of the installation with some capacity to spare. As a guide: 16mm2 (or parallel 6mm2) for overhead mains, 10mm2 for underground mains.
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166. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Light
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168. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Light Known resistance
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171. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Light
172. MAIN SWITCHBOARD Circuit Protective Devices Main Switch Consumer Mains Earth Link Neutral Link Light Switched Active
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176. MEN Connection MAIN SWITCHBOARD Circuit Protective Devices Neutral Link Sub Mains Sub Mains ` Neutral Link DISTRIBUTION BOARD 3 Circuit Protective Devices Earthing Bar DISTRIBUTION BOARD 2 Circuit Protective Devices Neutral Link Earthing Bar Sub Mains Circuit Protective Devices Neutral Link Earthing Bar DISTRIBUTION BOARD 1 Main Switch A N Thank You The End