# Electrical **URL:** https://forumautomation.com/c/electrical/11.md [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) --- ## [Motor control circuits - Types](https://forumautomation.com/t/motor-control-circuits-types/3959)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [June 28, 2018, 6:08pm UTC](https://forumautomation.com/t/motor-control-circuits-types/3959 "2018-06-28T18:08:23Z")
The function of the motor control circuit is to control the AC motors. A higher voltage is required to start the motor, where a voltage lower than the starting voltage is required to operate. Changing the motor from a hi… --- ## [DC COMPOUND MOTOR AND ITS TYPES](https://forumautomation.com/t/dc-compound-motor-and-its-types/6306)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [April 27, 2019, 5:20pm UTC](https://forumautomation.com/t/dc-compound-motor-and-its-types/6306 "2019-04-27T17:20:29Z")
DC COMPOUND MOTOR A compound wound DC motor is a self-excited motor it is a combination of Dc series motor and shunt Dc motor it has both shunt and series field windings with the help of field c… --- ## [What is Fuse and advantages of fuse?](https://forumautomation.com/t/what-is-fuse-and-advantages-of-fuse/10129)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [January 14, 2022, 6:32am UTC](https://forumautomation.com/t/what-is-fuse-and-advantages-of-fuse/10129 "2022-01-14T06:32:31Z")
What is a fuse? Fuse is an electrical device that is designed as a current interrupting device that opens or breaks the circuit by fusing the element in the circuit when current exceeds a certain value. A fuse is an … --- ## [What is a Transformer? Types and Transformer protection](https://forumautomation.com/t/what-is-a-transformer-types-and-transformer-protection/682)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 4\ **Last updated:** [October 14, 2024, 2:26pm UTC](https://forumautomation.com/t/what-is-a-transformer-types-and-transformer-protection/682 "2024-10-14T14:26:33Z")
What is a Transformer device? The transformer is a device that transfers electrical energy from one circuit to another through the magnetic field without change of frequency. Types of Transformer Based on service … --- ## [What are the benefits of using a superconducting generator](https://forumautomation.com/t/what-are-the-benefits-of-using-a-superconducting-generator/6500)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 6, 2019, 6:14pm UTC](https://forumautomation.com/t/what-are-the-benefits-of-using-a-superconducting-generator/6500 "2019-06-06T18:14:29Z")
WHAT IS SUPERCONDUCTING GENERATOR In this generator superconductors are used in field windings, this generator has a supercooled rotor it is different from the conventional generator in terms of the power system, effici… --- ## [What are the essential features of a Switchgear? How a switchgear can be used for the protection of Power System?](https://forumautomation.com/t/what-are-the-essential-features-of-a-switchgear-how-a-switchgear-can-be-used-for-the-protection-of-power-system/6606)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 25, 2019, 3:48am UTC](https://forumautomation.com/t/what-are-the-essential-features-of-a-switchgear-how-a-switchgear-can-be-used-for-the-protection-of-power-system/6606 "2019-06-25T03:48:32Z")
What is a switchgear Switchgear is a device which is used for the switching controlling and for the protection of the electrical circuits and equipment, the importance of electricity in our modern civilization is very h… --- ## [Brief Idea About Ingress Protection : How to rate IP](https://forumautomation.com/t/brief-idea-about-ingress-protection-how-to-rate-ip/239)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [February 9, 2015, 6:47pm UTC](https://forumautomation.com/t/brief-idea-about-ingress-protection-how-to-rate-ip/239 "2015-02-09T18:47:34Z")
Two types of protection : Solids and Water Protection From Solids 1 - Protection againsr a solid object greater than 50 mm such as hand 2 - protection against a solid object greater than 12.5mm such as a finger 3 - Pr… --- ## [What is single line diagram (SLD)?](https://forumautomation.com/t/what-is-single-line-diagram-sld/886)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [March 20, 2016, 7:31pm UTC](https://forumautomation.com/t/what-is-single-line-diagram-sld/886 "2016-03-20T19:31:25Z")
Single Line Diagram During the preliminary project designing of any project,the key diagram used is the single line diagram (SLD) also called the one line diagram and a number of subsidiary signal line diagrams. The se… --- ## [What is an isolator? How is it different from a circuit breaker?](https://forumautomation.com/t/what-is-an-isolator-how-is-it-different-from-a-circuit-breaker/7959)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 1\ **Last updated:** [March 2, 2020, 7:03am UTC](https://forumautomation.com/t/what-is-an-isolator-how-is-it-different-from-a-circuit-breaker/7959 "2020-03-02T07:03:33Z")
What is isolator and why isolator is used The isolator is a type of switching device, it can be operated manually or automatically which separates a part of the electrical power. Isolators can be used to open a circui… --- ## [What are the difference between Single Line Diagram (SLD ) and Three Line Diagram?](https://forumautomation.com/t/what-are-the-difference-between-single-line-diagram-sld-and-three-line-diagram/888)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [March 20, 2016, 7:49pm UTC](https://forumautomation.com/t/what-are-the-difference-between-single-line-diagram-sld-and-three-line-diagram/888 "2016-03-20T19:49:59Z")
Single Line Diagram Vs Three Line Diagram A) Single Line Diagram (SLD) 1.Single line diagrams provide a basic road-map to the interconnections of the electrical system and serve as a building block from which all types… --- ## [AC VOLTAGE CONTROL BY USING DIAC AND TRIAC](https://forumautomation.com/t/ac-voltage-control-by-using-diac-and-triac/6163)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [March 29, 2019, 4:09pm UTC](https://forumautomation.com/t/ac-voltage-control-by-using-diac-and-triac/6163 "2019-03-29T16:09:46Z")
A TRIAC is a three terminal semiconductor device which can control the flow of the current and thus its name is TRIAC it has a similar operation to two thyristors connected in reverse parallel with a common gate connecti… --- ## [Slip ring induction motor, construction, advantages and disadvantages](https://forumautomation.com/t/slip-ring-induction-motor-construction-advantages-and-disadvantages/5090)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 2, 2018, 11:56am UTC](https://forumautomation.com/t/slip-ring-induction-motor-construction-advantages-and-disadvantages/5090 "2018-11-02T11:56:24Z")
A slip ring induction motor is an asynchronous motor, since the rotor never operates at synchronous speed with the stator poles. We will understand the construction and operation of the slip ring induction motor: Constr… --- ## [What are the advantages of HVDC over HVAC transmission?](https://forumautomation.com/t/what-are-the-advantages-of-hvdc-over-hvac-transmission/6730)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [July 11, 2019, 11:28am UTC](https://forumautomation.com/t/what-are-the-advantages-of-hvdc-over-hvac-transmission/6730 "2019-07-11T11:28:41Z")
What is the aim of electric power supply To supply electrical power which is required for all the customers in an entire geographical area at all the time continuously and it must be done in low cost the geographical ar… --- ## [What is an Electrical Drive? What are the Types, Advantages, Disadvantages and Applications?](https://forumautomation.com/t/what-is-an-electrical-drive-what-are-the-types-advantages-disadvantages-and-applications/9781)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [August 23, 2021, 11:45am UTC](https://forumautomation.com/t/what-is-an-electrical-drive-what-are-the-types-advantages-disadvantages-and-applications/9781 "2021-08-23T11:45:56Z")
What is an Electrical Drive? “Electrical drives” are electrical power systems used to control motion. For motion control, it involves a complex electronic system or a combination of different systems. Block Diagram of… --- ## [What is an opto-isolator and how does it work? what are its applications](https://forumautomation.com/t/what-is-an-opto-isolator-and-how-does-it-work-what-are-its-applications/7614)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 1\ **Last updated:** [March 2, 2020, 6:54am UTC](https://forumautomation.com/t/what-is-an-opto-isolator-and-how-does-it-work-what-are-its-applications/7614 "2020-03-02T06:54:36Z")
What is an optoisolator Opto-isolator is also known as an optical isolator, or optocoupler, it is a device that transfers an electric signal or voltage from one circuit to another by using the light, while it isolates t… --- ## [What type of Motor Connection? Star or Delta](https://forumautomation.com/t/what-type-of-motor-connection-star-or-delta/12203)
**Author:** [@TSRS](https://forumautomation.com/u/TSRS)\ **Replies:** 2\ **Last updated:** [June 25, 2024, 4:08pm UTC](https://forumautomation.com/t/what-type-of-motor-connection-star-or-delta/12203 "2024-06-25T16:08:23Z")
What type of Motor Connection? Star or Delta CAN ANYONE CLARIFY --- ## [What are Control relays?](https://forumautomation.com/t/what-are-control-relays/2888)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 29, 2017, 3:47pm UTC](https://forumautomation.com/t/what-are-control-relays/2888 "2017-12-29T15:47:22Z")
Basic working principle: An electromechanical relay is an electrical switch actuated by an electromagnet coil. As for switching devices, they exhibit simple “on” and “off” behaviour with no intermediate states. Relays … --- ## [MCC panel & smart MCCs](https://forumautomation.com/t/mcc-panel-smart-mccs/3701)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 26, 2018, 3:10pm UTC](https://forumautomation.com/t/mcc-panel-smart-mccs/3701 "2018-05-26T15:10:11Z")
MCC panel: MCC stands for Motor Control Center which is a floor mounted assembly for motor control. The MCC contains all the motor control units, feeders for the motors and blowers. They are specially designed for differ… --- ## [Working of Variable Frequency Drive (VFD) or VFD for motor control](https://forumautomation.com/t/working-of-variable-frequency-drive-vfd-or-vfd-for-motor-control/2908)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 1, 2018, 7:00pm UTC](https://forumautomation.com/t/working-of-variable-frequency-drive-vfd-or-vfd-for-motor-control/2908 "2018-01-01T19:00:45Z")
What is VFD? VFDs (Variable Frequency Drive) are drivers which regulate the electric current to instruments. Instruments such as motors and fans work only at one speed if they are directly connected to the 3 phase powe… --- ## [WHAT IS GROUNDING? DIFFERENCE BETWEEN GROUNDED AND UNGROUNDED SYSTEMS](https://forumautomation.com/t/what-is-grounding-difference-between-grounded-and-ungrounded-systems/6520)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 10, 2019, 5:57pm UTC](https://forumautomation.com/t/what-is-grounding-difference-between-grounded-and-ungrounded-systems/6520 "2019-06-10T17:57:46Z")
WHAT IS GROUNDING Grounding is the method by which we can avoid ourselves from electrical hazards major part of the grounding process is earth, the earth is a good conductor, so we provide a conductive path for the fa… --- ## [What is galvanic isolation and why is it required](https://forumautomation.com/t/what-is-galvanic-isolation-and-why-is-it-required/7600)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [December 24, 2019, 1:32pm UTC](https://forumautomation.com/t/what-is-galvanic-isolation-and-why-is-it-required/7600 "2019-12-24T13:32:58Z")
What is galvanic isolation Galvanic isolation is a complete physical separation between the input and output and it could be achieved by means of transformers with physically different primary and secondary windings. T… --- ## [TYPES OF FEEDERS USED FOR ELECTRICAL DISTRIBUTION](https://forumautomation.com/t/types-of-feeders-used-for-electrical-distribution/6177)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [April 1, 2019, 5:23pm UTC](https://forumautomation.com/t/types-of-feeders-used-for-electrical-distribution/6177 "2019-04-01T17:23:28Z")
TYPES OF FEEDERS USED FOR ELECTRICAL DISTRIBUTION Feeders are used for the transmission of electricity it is the power line in which electricity is transmitted in power systems. It does the transmission of po… --- ## [11 Types of electrical transducers](https://forumautomation.com/t/11-types-of-electrical-transducers/7150)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [September 19, 2019, 3:59am UTC](https://forumautomation.com/t/11-types-of-electrical-transducers/7150 "2019-09-19T03:59:26Z")
What is electrical transducer An electrical transducer is a transducer which can convert a non-electrical physical quantity into an electrical signal such as voltage, current or change in inductance resistance, capacit… --- ## [Electrical Transformers Pre‐Commissioning Checklist](https://forumautomation.com/t/electrical-transformers-pre-commissioning-checklist/3685)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 24, 2018, 2:08pm UTC](https://forumautomation.com/t/electrical-transformers-pre-commissioning-checklist/3685 "2018-05-24T14:08:27Z")
Pre-commissioning tests are performed to ensure to the healthiness of the Transformer. Pre-commissioning tests start after oil filling process is completed. Various electrical tests are performed, they are listed belo… --- ## [Installation procedure for Motor Control Center (MCC)](https://forumautomation.com/t/installation-procedure-for-motor-control-center-mcc/7639)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 2, 2020, 6:23pm UTC](https://forumautomation.com/t/installation-procedure-for-motor-control-center-mcc/7639 "2020-01-02T18:23:20Z")
Here we discuss the installation procedure for MCC panel. Using the crane/fork lift, MCC panels must be carefully removed from the vehicle and moved to the correct storage location. Items found inappropriate for the p… --- ## [What are the major causes of Electric Shock? How can we prevent Electrical hazards?](https://forumautomation.com/t/what-are-the-major-causes-of-electric-shock-how-can-we-prevent-electrical-hazards/6537)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 1\ **Last updated:** [June 12, 2019, 4:27pm UTC](https://forumautomation.com/t/what-are-the-major-causes-of-electric-shock-how-can-we-prevent-electrical-hazards/6537 "2019-06-12T16:27:27Z")
ELECTRICAL HAZARDS Electrical hazards can be categorized into three types Electrical shocks Electrical arc burns Effects of a blast which include pressure impact, particles flying from a vaporized conductor The two … --- ## [What is a switch-yard and sub-station? What is the purpose of a switch-yard and how are they different from a switch-gear](https://forumautomation.com/t/what-is-a-switch-yard-and-sub-station-what-is-the-purpose-of-a-switch-yard-and-how-are-they-different-from-a-switch-gear/6573)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 19, 2019, 6:08pm UTC](https://forumautomation.com/t/what-is-a-switch-yard-and-sub-station-what-is-the-purpose-of-a-switch-yard-and-how-are-they-different-from-a-switch-gear/6573 "2019-06-19T18:08:50Z")
What is a switchyard and sub-station Switchyard is a switching station which is the main link between the generating plant and the transmission system. It can be considered as the heart of the power plant, the generated… --- ## [Difference between Dry Contact and Wet Contact (Dry Contact vs Wet Contact)](https://forumautomation.com/t/difference-between-dry-contact-and-wet-contact-dry-contact-vs-wet-contact/9816)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 2\ **Last updated:** [September 21, 2026, 9:40am UTC](https://forumautomation.com/t/difference-between-dry-contact-and-wet-contact-dry-contact-vs-wet-contact/9816 "2026-09-21T09:40:33Z")
What is Dry Contact? Dry contacts are also called voltage-free contacts or potential-free contacts\*\*.\*\* It is defined as a contact in which that doesn’t provide power/voltage from the switch, but is provided from an ext… --- ## [What is a transformer and what are its uses? How does a transformer work](https://forumautomation.com/t/what-is-a-transformer-and-what-are-its-uses-how-does-a-transformer-work/6591)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 22, 2019, 3:53am UTC](https://forumautomation.com/t/what-is-a-transformer-and-what-are-its-uses-how-does-a-transformer-work/6591 "2019-06-22T03:53:54Z")
What is a Transformer A transformer is a static equipment, with two or more windings linked to a common magnetic field. By using electromagnetic induction this device will transfer electrical energy from one circuit to … --- ## [Why the three phase voltage is 415V and not 660V](https://forumautomation.com/t/why-the-three-phase-voltage-is-415v-and-not-660v/9724)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Replies:** 2\ **Last updated:** [November 8, 2024, 1:15pm UTC](https://forumautomation.com/t/why-the-three-phase-voltage-is-415v-and-not-660v/9724 "2024-11-08T13:15:00Z")
Explain why the three phase voltage is not 660V --- ## [Why do we need electrical and electronic symbols and why are electrical symbols important?](https://forumautomation.com/t/why-do-we-need-electrical-and-electronic-symbols-and-why-are-electrical-symbols-important/7844)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [February 5, 2020, 6:30pm UTC](https://forumautomation.com/t/why-do-we-need-electrical-and-electronic-symbols-and-why-are-electrical-symbols-important/7844 "2020-02-05T18:30:40Z")
What is the importance of electrical symbols and why circuit symbols are used Electrical symbols are used to simplify the drafting and to understand the drawing. Electrical symbols are standardized throughout the indust… --- ## [What is electrical system and its parts](https://forumautomation.com/t/what-is-electrical-system-and-its-parts/7993)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 1\ **Last updated:** [March 10, 2020, 11:40am UTC](https://forumautomation.com/t/what-is-electrical-system-and-its-parts/7993 "2020-03-10T11:40:53Z")
What is an electrical system The electrical system is a combination of electrical components that are connected to carry out some operations. The electrical power system is a composite system of generation, transmissi… --- ## [Resistance measurement; 2, 3 or 4 wire connection – How does it work and which to use?](https://forumautomation.com/t/resistance-measurement-2-3-or-4-wire-connection-how-does-it-work-and-which-to-use/10459)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [June 6, 2022, 6:01am UTC](https://forumautomation.com/t/resistance-measurement-2-3-or-4-wire-connection-how-does-it-work-and-which-to-use/10459 "2022-06-06T06:01:08Z")
What is 2 wire RTD? A single wire connects each end of the RTD element in a two-wire RTD. It’s the simplest wire arrangement. The computed resistance will encompass all elements of the circuit, implying a higher margin … --- ## [What is difference between ELR and EFR.....?](https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [November 29, 2014, 7:23am UTC](https://forumautomation.com/t/what-is-difference-between-elr-and-efr/173 "2014-11-29T07:23:00Z")
What is the difference between ELR and EFR and how they can be selected for different applications…? --- ## [Overload protection of motors](https://forumautomation.com/t/overload-protection-of-motors/4032)
**Author:** [@areejsidhik](https://forumautomation.com/u/areejsidhik)\ **Replies:** 0\ **Last updated:** [July 6, 2018, 6:38am UTC](https://forumautomation.com/t/overload-protection-of-motors/4032 "2018-07-06T06:38:44Z")
Before you knowing about overload protection check out the post about contactors link given below what is contractors Overload protection prevents an electric motor fromdrawing too much current, overheating, and litera… --- ## [Variable Frequency Drive- Basics, Working and Selection of VFD](https://forumautomation.com/t/variable-frequency-drive-basics-working-and-selection-of-vfd/3948)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [June 27, 2018, 6:18pm UTC](https://forumautomation.com/t/variable-frequency-drive-basics-working-and-selection-of-vfd/3948 "2018-06-27T18:18:52Z")
What is VFD? VFD is variable Frequency Drive, it is a device that controls the voltage and frequency that is being supplied to a motor and therefore controls the speed of the motor and the system it is driving. Why V… --- ## [STATIC INDUCTION THYRISTOR](https://forumautomation.com/t/static-induction-thyristor/6456)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [May 27, 2019, 5:51pm UTC](https://forumautomation.com/t/static-induction-thyristor/6456 "2019-05-27T17:51:01Z")
STATIC INDUCTION THYRISTOR This is a device which is capable of conducting large current with a low forward voltage and it can turn-off very fast, it is a self-controlled on-off device. A thyristor… --- ## [Different types of Relays](https://forumautomation.com/t/different-types-of-relays/7308)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 19, 2019, 6:58pm UTC](https://forumautomation.com/t/different-types-of-relays/7308 "2019-10-19T18:58:23Z")
Relays are an electronic component that can implement switching logic.A relay is a switching device for isolating or shifting the state of an electrical circuit from one state to another. These devices are economical, ea… --- ## [Why does induction motor use heavy current at starting?](https://forumautomation.com/t/why-does-induction-motor-use-heavy-current-at-starting/10484)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [June 16, 2022, 7:53am UTC](https://forumautomation.com/t/why-does-induction-motor-use-heavy-current-at-starting/10484 "2022-06-16T07:53:32Z")
For maintenance engineers, starting an induction motor is the most difficult task. To start higher-rated motors, we’ll need to create a heavy starter, a large autotransformer, or a VFD. If the motor rating exceeds 350kw … --- ## [How to manage transformer inrush current?](https://forumautomation.com/t/how-to-manage-transformer-inrush-current/6441)
**Author:** [@Ashlin.aj](https://forumautomation.com/u/Ashlin.aj)\ **Replies:** 1\ **Last updated:** [September 19, 2024, 2:25pm UTC](https://forumautomation.com/t/how-to-manage-transformer-inrush-current/6441 "2024-09-19T14:25:52Z")
TRANSFORMER INRUSH CURRENT Transformer inrush current is due to the energization of the transformer and it is usually seen in one winding of the transformer and mostly it would be the primary windin… --- ## [Panel Protective relays - Earth leakage relays (ELR), Earth fault relays (EFR) and Phase Failure Relay (PFR)](https://forumautomation.com/t/panel-protective-relays-earth-leakage-relays-elr-earth-fault-relays-efr-and-phase-failure-relay-pfr/3738)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 31, 2018, 1:53pm UTC](https://forumautomation.com/t/panel-protective-relays-earth-leakage-relays-elr-earth-fault-relays-efr-and-phase-failure-relay-pfr/3738 "2018-05-31T13:53:08Z")
When manufacturing a panel board it is essential to have some protective methods other than breakers which provide additional protection to the panel board, equipment that is connected to the panel board and the user. F… --- ## [7 Best electrical diagram apps for android and their features](https://forumautomation.com/t/7-best-electrical-diagram-apps-for-android-and-their-features/7424)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [November 15, 2019, 1:35pm UTC](https://forumautomation.com/t/7-best-electrical-diagram-apps-for-android-and-their-features/7424 "2019-11-15T13:35:06Z")
What is electrical diagram An electrical diagram can be explained as the pictorial form of an electrical circuit, it describes various components of a wiring schematic. In this pictorial from it has wire markings, wire… --- ## [What are the major components of a VFD or VSD? How VFD/VSD works?](https://forumautomation.com/t/what-are-the-major-components-of-a-vfd-or-vsd-how-vfd-vsd-works/1279)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 2\ **Last updated:** [October 10, 2024, 4:38pm UTC](https://forumautomation.com/t/what-are-the-major-components-of-a-vfd-or-vsd-how-vfd-vsd-works/1279 "2024-10-10T16:38:47Z")
VFD - A variable frequency drive or Variable speed drive VSD is an electronic power unit which provides infinitely adjustable control of the speed of 3 phase AC motors by converting fixed mains voltage and frequency in… --- ## [TYPES OF CIRCUIT BREAKER](https://forumautomation.com/t/types-of-circuit-breaker/6395)
**Author:** [@Ashlin.aj](https://forumautomation.com/u/Ashlin.aj)\ **Replies:** 0\ **Last updated:** [May 16, 2019, 2:30am UTC](https://forumautomation.com/t/types-of-circuit-breaker/6395 "2019-05-16T02:30:36Z")
TYPES OF CIRCUIT BREAKER In an electrical system if any fault occurs in the system then that part must be isolated from the remaining part of the system which is healthy and this can be done by the… --- ## [What is Induction type relay?](https://forumautomation.com/t/what-is-induction-type-relay/1007)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [April 24, 2016, 9:28pm UTC](https://forumautomation.com/t/what-is-induction-type-relay/1007 "2016-04-24T21:28:08Z")
Induction type relays are most widely used for protective-relaying purposes involving ac quantities. They are not usable with DC quantities,owing to the principle of operation An induction type relay is split-phase ind… --- ## [DIRECTIONAL COMPARISON BLOCKING SCHEME](https://forumautomation.com/t/directional-comparison-blocking-scheme/6410)
**Author:** [@Ashlin.aj](https://forumautomation.com/u/Ashlin.aj)\ **Replies:** 0\ **Last updated:** [May 18, 2019, 5:49pm UTC](https://forumautomation.com/t/directional-comparison-blocking-scheme/6410 "2019-05-18T17:49:11Z")
DIRECTIONAL COMPARISON BLOCKING SCHEME This is a high-speed protection scheme designed to provide quick tripping for faults anywhere on the protected line, this is the most common pilot relaying scheme which … --- ## [What are electrical materials and what are the electrical materials which is used for electrical installations](https://forumautomation.com/t/what-are-electrical-materials-and-what-are-the-electrical-materials-which-is-used-for-electrical-installations/7386)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [November 5, 2019, 12:55pm UTC](https://forumautomation.com/t/what-are-electrical-materials-and-what-are-the-electrical-materials-which-is-used-for-electrical-installations/7386 "2019-11-05T12:55:13Z")
What are electrical material Electrical materials are used for the electrical installations, in case of house wiring or building wiring electrical materials are used. We can’t do the electrical installations without u… --- ## [What are the different types of Fuses?](https://forumautomation.com/t/what-are-the-different-types-of-fuses/6556)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [June 14, 2019, 6:44pm UTC](https://forumautomation.com/t/what-are-the-different-types-of-fuses/6556 "2019-06-14T18:44:27Z")
FUSES A fuse can be used to protect the electrical circuit against the short circuit failure, it has a thin wire in it, which will burn when excessive current flows and the current rating will be marked in the fuse T… --- ## [What is smart grid technology](https://forumautomation.com/t/what-is-smart-grid-technology/3990)
**Author:** [@areejsidhik](https://forumautomation.com/u/areejsidhik)\ **Replies:** 0\ **Last updated:** [July 2, 2018, 3:06am UTC](https://forumautomation.com/t/what-is-smart-grid-technology/3990 "2018-07-02T03:06:01Z")
Introdcution Before smart grid technology there is electric grid lets see what is an electric grid and Why Modernization of Electric Grid is required? The electric grid delivers electricity from points of generation t… --- ## [What is the difference between IS and Non-IS cables?](https://forumautomation.com/t/what-is-the-difference-between-is-and-non-is-cables/5686)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 9, 2019, 2:51pm UTC](https://forumautomation.com/t/what-is-the-difference-between-is-and-non-is-cables/5686 "2019-01-09T14:51:03Z")
IS cables means intrinsically safe and non IS means non intrinsically safe. IS cables are used in intrinsic safety circuits. Before we look into the IS and Non IS cables we have to know about intrinsically safe circuits. … [Next page](https://forumautomation.com/c/electrical/11.md?page=1&per_page=50)