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Power Systems

What is Differential Protection?

What is Differential Protection? Differential Protection Definition Differential protection is a method used to clear internal faults in the stator winding of a generator or alternator. Current Transformers Two sets of current transformers (CTs) are used, one on the line side and one on the neutral

By Encyclopedia 07/30, 2024
Power Systems

What is Overvoltage Protection ?

What is Overvoltage Protection ? Overvoltage Protection Definition Overvoltage protection is defined as measures taken to prevent electrical systems from damage due to excessive voltage levels. Causes of Overvoltage Overvoltages can be caused by lightning, switching operations, insulation failure, a

By Encyclopedia 07/30, 2024
circuit diagram

Wiring method of motor open-phase protection

Wiring method of motor open-phase protection

By Master Electrician 07/02, 2024
Power Systems

Electromagnetic Relay Working | Types of Electromagnetic Relays

Electromagnetic Relay Electromagnetic relays are those relays which are operated by electromagnetic action. Modern electrical protection relays are mainly micro processor based, but still electromagnetic relay holds its place. It will take much longer time to replace all electromagnetic relays by mi

By Electrical4u 03/26, 2024
Power Systems

Types of Electrical Protection Relays or Protective Relays

Definition of Protective Relay A relay is automatic device which senses an abnormal condition of electrical circuit and closes its contacts. These contacts in turns close and complete the circuit breaker trip coil circuit hence make the circuit breaker tripped for disconnecting the faulty portion of

By Electrical4u 03/26, 2024
Power Systems

Motor Protection Relay for High Voltage Induction Motor

Above 90% of motors used in an industry are induction motors , because they are cheap, robust and easy to maintain. For higher HP ( 250HP) motors we prefer high voltage , because it will reduce operating current and the size of the motor. Why We Require Protection of Motors? To understand this we ne

By Electrical4u 03/26, 2024
Power Systems

Differential Relay

The relays used in power system protection are of different types. Among them differential relay is very commonly used relay for protecting transformers and generators from localised faults. Differential relays are very sensitive to the faults occurred within the zone of protection but they are leas

By Electrical4u 03/26, 2024
Power Systems

Inverse Time Relay | Definite Time Lag Relay

In this type of relays, the time of operation depends upon the magnitude of actuating quantity. If the magnitude of actuating quantity is very high, the relay operation is very fast. In other words, the relay operating time that is time delay in the relay is inversely proportional to the magnitude o

By Electrical4u 03/26, 2024
Power Systems

Instantaneous Relay

In a simple way electrical relay is shown in the figure above. Here the fixed coil is fed from the circuit to be protected. When there is a current in fixed coil above the pick up value, the iron plunger is so attracted, it moves upward and makes NO contact closed. The function of this relay is very

By Electrical4u 03/26, 2024
Power Systems

Distance Relay or Impedance Relay Working Principle Types

There is one type of relay which functions depending upon the distance of fault in the line. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. These relays are known as distance relay or impedance relay . Working Pri

By The Electricity Forum 03/26, 2024
Power Systems

Thermal Relay Working Principle Construction of Thermal Overload Relay

The coefficient of expansion is one of the basic properties of any material. Two different metals always have different degree of linear expansion. A bimetallic strip always bends when it heated up, due to this inequality of linear expansion of two different metals. Working Principle of Thermal Rela

By Electrical4u 03/26, 2024
Power Systems

Over Current Relay Working Principle Types

In an over current relay or o/c relay the actuating quantity is only current . There is only one current operated element in the relay, no voltage coil etc. are required to construct this protective relay . Working Principle of Over Current Relay In an over current relay , there would be essentially

By Electrical4u 03/26, 2024

Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

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What is Differential Protection?

What is Overvoltage Protection ?

Wiring method of motor open-phase protection

Electromagnetic Relay Working | Types of Electromagnetic Relays

Types of Electrical Protection Relays or Protective Relays

Motor Protection Relay for High Voltage Induction Motor

Differential Relay

Inverse Time Relay | Definite Time Lag Relay

Instantaneous Relay

Distance Relay or Impedance Relay Working Principle Types

Thermal Relay Working Principle Construction of Thermal Overload Relay

Over Current Relay Working Principle Types

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