Estimating, repairing & manintaining electrical items
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This document discusses various electrical items and their components. It begins with an overview of how to conduct market surveys and considerations for quality and cost for electrical items. It then provides detailed descriptions and diagrams of the key parts for several common electrical devices: 1) DOL starter, 2) single-phase capacitor start motor, 3) mono block water pump, 4) automatic electric iron, 5) table fan, 6) ceiling fan, and 7) ICDP switch. The document encourages guessing details like capacitor ratings and fuse materials. It concludes by thanking the audience and asking if there are any questions.
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This document discusses commutation of SCRs (silicon controlled rectifiers). Commutation is the process of turning off an SCR. There are natural and forced commutation methods. Natural commutation occurs automatically in AC when the load current drops below the holding current or the SCR becomes reverse biased. Forced commutation is required in DC applications using an extra circuit to forcefully turn off the SCR. Commutation can occur through reducing the current below the holding current level or applying a reverse voltage. There are different classes of commutation depending on the method used.
RATINGS OF SCR
This document discusses the key ratings of silicon controlled rectifiers (SCRs) that must be considered for reliable operation. It outlines voltage ratings like peak repetitive forward blocking voltage and peak working reverse voltage. It also covers current ratings like maximum average current rating and di/dt rating. Thermal ratings like the I2t rating and maximum junction temperature are provided. The document emphasizes that SCRs must operate within these specified ratings to avoid damage.
SCR COMMUTATION PART 2
This document discusses different types of commutation for turning off SCRs (thyristors). It describes Class A commutation which uses a resonant load to achieve zero voltage turn-off, Class B which uses self-commutation via the intrinsic timing of the SCR, and Class C which uses one SCR to turn off another. Class D uses an auxiliary SCR to apply reverse voltage commutation across the main SCR. Class E applies a reverse voltage pulse and Class F utilizes the negative half of an AC cycle for natural commutation without extra circuitry. In summary, the document outlines six common classes of commutation techniques for turning off SCRs either through reducing current or applying a reverse voltage.
MOUNTING OF SCR
The document discusses five different mounting techniques for silicon controlled rectifiers (SCRs) used in power electronics based on capacity level: lead mounting for low capacity, stud mounting for medium-high capacity, bolt mounting for medium-high capacity, press fit mounting for higher capacity, and press pack/disc/hockey pack mounting for very high capacity applications where multiple SCRs are sandwiched between heat sink plates for cooling.
SCR PROTECTION PART 2
SCRs require protection from over voltage, over current, and high rates of change of voltage and current. This is because SCRs are sensitive devices that can be damaged by transient overloads or abnormal operating conditions. Various protection techniques are used like snubber circuits, surge suppressors, fuses, contactors, and gate protection circuits to prevent damage to SCRs in power electronic applications and ensure reliable system operation.
More from RanjitKumar Parmar (20)
ESTIMATION & COSTING OF DOMESTIC & INDUSTRIAL WIRING
ESTIMATION & COSTING OF DOMESTIC & INDUSTRIAL WIRING
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Design and optimization of ion propulsion drone
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
Object Oriented Analysis and Design - OOAD
This ppt gives detailed description of Object Oriented Analysis and design.
一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
原版一模一样【微信：741003700 】【(osu毕业证书)美国俄勒冈州立大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
SCALING OF MOS CIRCUITS m .pptx
this ppt explains about scaling parameters of the mosfet it is basically vlsi subject
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
Null Bangalore | Pentesters Approach to AWS IAM
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
LLM Fine Tuning with QLoRA Cassandra Lunch 4, presented by Anant
Slides for the 4th Presentation on LLM Fine-Tuning with QLoRA Presented by Anant, featuring DataStax Astra
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...Paris Salesforce Developer Group
Build the Next Generation of Apps with the Einstein 1 Platform.
Rejoignez Philippe Ozil pour une session de workshops qui vous guidera à travers les détails de la plateforme Einstein 1, l'importance des données pour la création d'applications d'intelligence artificielle et les différents outils et technologies que Salesforce propose pour vous apporter tous les bénéfices de l'IA.Digital Twins Computer Networking Paper Presentation.pptx
A Digital Twin in computer networking is a virtual representation of a physical network, used to simulate, analyze, and optimize network performance and reliability. It leverages real-time data to enhance network management, predict issues, and improve decision-making processes.
Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...
Energy efficiency has been important since the latter part of the last century. The main object of this survey is to determine the energy efficiency knowledge among consumers. Two separate districts in Bangladesh are selected to conduct the survey on households and showrooms about the energy and seller also. The survey uses the data to find some regression equations from which it is easy to predict energy efficiency knowledge. The data is analyzed and calculated based on five important criteria. The initial target was to find some factors that help predict a person's energy efficiency knowledge. From the survey, it is found that the energy efficiency awareness among the people of our country is very low. Relationships between household energy use behaviors are estimated using a unique dataset of about 40 households and 20 showrooms in Bangladesh's Chapainawabganj and Bagerhat districts. Knowledge of energy consumption and energy efficiency technology options is found to be associated with household use of energy conservation practices. Household characteristics also influence household energy use behavior. Younger household cohorts are more likely to adopt energy-efficient technologies and energy conservation practices and place primary importance on energy saving for environmental reasons. Education also influences attitudes toward energy conservation in Bangladesh. Low-education households indicate they primarily save electricity for the environment while high-education households indicate they are motivated by environmental concerns.
Applications of artificial Intelligence in Mechanical Engineering.pdf
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
Supermarket Management System Project Report.pdf
Supermarket management is a stand-alone J2EE using Eclipse Juno program.
This project contains all the necessary required information about maintaining
the supermarket billing system.
The core idea of this project to minimize the paper work and centralize the
data. Here all the communication is taken in secure manner. That is, in this
application the information will be stored in client itself. For further security the
data base is stored in the back-end oracle and so no intruders can access it.
Recently uploaded (20)
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
LLM Fine Tuning with QLoRA Cassandra Lunch 4, presented by Anant
LLM Fine Tuning with QLoRA Cassandra Lunch 4, presented by Anant
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
1FIDIC-CONSTRUCTION-CONTRACT-2ND-ED-2017-RED-BOOK.pdf
1FIDIC-CONSTRUCTION-CONTRACT-2ND-ED-2017-RED-BOOK.pdf
5G Radio Network Througput Problem Analysis HCIA.pdf
5G Radio Network Througput Problem Analysis HCIA.pdf
Digital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptx
Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...
Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...
Applications of artificial Intelligence in Mechanical Engineering.pdf
Applications of artificial Intelligence in Mechanical Engineering.pdf
Estimating, repairing & manintaining electrical items
- 1. By: Prof. Ranjit Kumar Parmar Head, ELECTRICAL ENGINEERING DEPARTMENT GOVT POLYTECHNIC JUNAGADH Electrical Dept Govt Polyytechnic Junagadh
- 2. Market Survey.. How specification plays an important role? How to use catalogue? How to access internet for price reference? One to one meet to vendors Let us Guess price of few electrical items.. Electrical Dept Govt Polyytechnic Junagadh
- 3. Quality & Cost Branded Vs Non Branded Recall few famous brands of Electrical items Who are distributors? Maintenance Vs price inclusion After service Difference between guaranty & Warranty Electrical Dept Govt Polyytechnic Junagadh
- 4. Parts & Drawings of… 1. DOL Starter Electrical Dept Govt Polyytechnic Junagadh
- 5. Animation of DOL Starter https://www.youtube.com/watch?v=VYVkUCJPeQ4 Parts of DOL Starter Enclosure On Off push buttons Electro magnetic auxiliary contacts Thermal Relay Main contactor https://www.youtube.com/watch?v=tMIg24cHqwE Electrical Dept Govt Polyytechnic Junagadh
- 6. https://www.youtube.com/watch?v=QGrxp_Sro-4 No volt coil or hold coil Electrical Dept Govt Polyytechnic Junagadh
- 7. 2. 1 ph capacitor start motors Main body & Stator frame Stator core Rotor core Stator & rotor windings Rotor shaft Starting capacitor Bearings Centrifugal switch Terminal Box Electrical Dept Govt Polytechnic Junagadh
- 8. 3. Mono Block Pump Pump motor Pump & delivery sections Bed or base plate Bearings Supply cord Electrical Dept Govt Polyytechnic Junagadh
- 9. 4. Automatic Electric Iron Heating Element Asbestos sheet Base plate Pressure plate Temperature regulator Porcelain beads Electrical Dept Govt Polyytechnic Junagadh
- 10. 5. Table fan Main body & Enclosures Motor for fan Blades Regulator Oscillating mechanism Capacitor…Guess rating..! Guard cover Base Electrical Dept Govt Polyytechnic Junagadh
- 11. 6. Ceiling fan Motor Capacitor Guess rating..! Blades Speed regulator Canopies and other miscellaneous items Electrical Dept Govt Polyytechnic Junagadh
- 12. 7. ICDP Enclosure Fuse….Guess fuse material U Shaped copper contacts as switch Handle etc Electrical Dept Govt Polyytechnic Junagadh
- 13. THANKS.. ANY QUESTIONS? Electrical Dept Govt Polyytechnic Junagadh