Explain The Principle Of Operation Of A Relay And A Circuit Breaker?

1.	Explain The Principle Of Operation Of A Relay And A Circuit Breaker?
Answer» RELAY: An electromagnetic relay works on TWO principles Electromagnetic attraction Electromagnetic induction The FORCE of attraction produced has two components-one is constant and the other is fluctuating at a frequency, twice the natural frequency. This force in terms of current is represented as- *F= K1 – K2 I2** K1=K2 * I2 Since K1 and K2 both are constants, so the current I will be constant. This is the condition when the relay is at the verge of operation and F=0. CIRCUIT BREAKER: Once a fault is detected, contacts within the circuit breaker must open to interrupt the circuit; some mechanically-stored energy (using SPRINGS or compressed air) contained within the breaker is used to separate the contacts, although some of the energy required may be obtained from the fault current itself. When a current is interrupted, an arc is generated. This arc must be contained, cooled, and extinguished in a controlled way, so that the GAP between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium in which the arc FORMS RELAY: An electromagnetic relay works on two principles The force of attraction produced has two components-one is constant and the other is fluctuating at a frequency, twice the natural frequency. This force in terms of current is represented as- *F= K1 – K2 I2** K1=K2 * I2 Since K1 and K2 both are constants, so the current I will be constant. This is the condition when the relay is at the verge of operation and F=0. CIRCUIT BREAKER: Once a fault is detected, contacts within the circuit breaker must open to interrupt the circuit; some mechanically-stored energy (using springs or compressed air) contained within the breaker is used to separate the contacts, although some of the energy required may be obtained from the fault current itself. When a current is interrupted, an arc is generated. This arc must be contained, cooled, and extinguished in a controlled way, so that the gap between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium in which the arc forms

Answer»

RELAY: An electromagnetic relay works on TWO principles

Electromagnetic attraction
Electromagnetic induction

The FORCE of attraction produced has two components-one is constant and the other is fluctuating at a frequency, twice the natural frequency. This force in terms of current is represented as-

F= K1 – K2 * I2

K1=K2 * I2

Since K1 and K2 both are constants, so the current I will be constant. This is the condition when the relay is at the verge of operation and F=0.

CIRCUIT BREAKER: Once a fault is detected, contacts within the circuit breaker must open to interrupt the circuit; some mechanically-stored energy (using SPRINGS or compressed air) contained within the breaker is used to separate the contacts, although some of the energy required may be obtained from the fault current itself. When a current is interrupted, an arc is generated. This arc must be contained, cooled, and extinguished in a controlled way, so that the GAP between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium in which the arc FORMS

RELAY: An electromagnetic relay works on two principles

The force of attraction produced has two components-one is constant and the other is fluctuating at a frequency, twice the natural frequency. This force in terms of current is represented as-

F= K1 – K2 * I2

K1=K2 * I2

Since K1 and K2 both are constants, so the current I will be constant. This is the condition when the relay is at the verge of operation and F=0.

CIRCUIT BREAKER: Once a fault is detected, contacts within the circuit breaker must open to interrupt the circuit; some mechanically-stored energy (using springs or compressed air) contained within the breaker is used to separate the contacts, although some of the energy required may be obtained from the fault current itself. When a current is interrupted, an arc is generated. This arc must be contained, cooled, and extinguished in a controlled way, so that the gap between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium in which the arc forms

Explain The Principle Of Operation Of A Relay And A Circuit Breaker?

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