Transformer Action
Transformer action is a phenomenon by which EMF(Electro-motive force) is induced in from one coil to the other coil by electro magnetic induction. It is the basic principle of electric transformers.
What is meant by B, C, D, K and Z curves in MCBs?
MCB (Miniature circuit breaker) is a resettable device designed to protect a circuit from short circuits and overcurrents. Trip curves of MCB's (B, C, D, K and Z curves) tell…
Difference between MCB and RCBO
MCB – Miniature Circuit Breaker and RCBO – Residual Current Circuit Breaker with Overload Protection are circuit protection devices. These devices are commonly used in low voltage power distribution and can be seen in distribution boards in homes, offices, commercial buildings etc.
Buchholz Relay | Buchholz relay – Principle of operation
In large oil immersed transformers, we can find a cylindrical object installed in the pipe connecting the conservator to the main tank. This cylindrical object, that looks like a solenoid valve is called Buchholz relay. It is a type of oil activated relays. It can be found in all oil immersed transformers rated higher than 500kva. (more…)
Difference between Higher potential and lower potential
Before getting into the topic, we have to keep two points in mind.1. Conventional Current flow. (The way Current is said to flow historically)2. Actual current flow. (The way Current actually flows).
Convert Kilovolt ampere (kVA) to kilowatts (kW)
What is Kilowatt?
Kilowatt is the unit of power. It is the product of voltage, ampere and power factor. It is also called as real power.
One kilowatt(kW) is equal to thousand watts(W).
PLC, DCS, RTU, SCADA and PAC Systems
PLC – Programmable Logic Controller
Programmable logic controllers are electronic devices used to control a process. It consists of CPU; Input and output devices, power supply, communication and redundancy units. PLCs are preprogrammed based on their application and put into operation. A PLC accepts inputs from the field, process the input based on the programming done and outputs the commands to the field equipment. It can also accept commands from the plant operators through SCADA and give commands to the field equipment. The features of PLCs vary from one manufacturer to the other but the basic architecture remains the same. (more…)
What is meant by stalling of motor?
Stalling is a condition at which a motor stops rotating even when there is sufficient voltage at it’s terminals. This condition occurs when the torque required by the load is more than the maximum torque (Breakdown torque) that can be generated by the motor. At this condition, the motor drains the maximum current and the speed comes zero.
Sizing of contactor and overload relay for 3 Phase DOL starter
Data required for selection of DOL starter
- KW rating of motor
- Operating voltage
- Application
- KVA code if available
Asynchronous motor(Induction Motor) Starters | Comparison of induction motor starters
As the name indicates, starters are used to start or stop a motor. It consists of an electromechanical switch and protection devices (overload and/or short-circuit protection).