Questions and Answers
What is the primary function of a protective relay in electrical engineering?
To trip a circuit breaker when a fault is detected
What were the early protective relays in electrical engineering based on?
Electromagnetic devices with coils and moving parts
What is one advantage of microprocessor-based solid-state digital protection relays over electromechanical relays?
They provide types of protection and supervision impractical with electromechanical relays
Why do numerical relays save capital and maintenance costs over electromechanical relays?
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Why are tens of thousands of 'silent sentinel' electromechanical relays still in use worldwide?
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Study Notes
Protective Relays in Electrical Engineering
- The primary function of a protective relay is to detect and respond to abnormal system conditions, such as faults, to prevent damage to equipment and ensure system stability.
Early Protective Relays
- Early protective relays in electrical engineering were based on electromechanical principles, using mechanical and electrical components to detect and respond to faults.
Solid-State Digital Protection Relays
- One advantage of microprocessor-based solid-state digital protection relays over electromechanical relays is that they offer improved accuracy, speed, and reliability, as well as advanced features and communication capabilities.
Numerical Relays
- Numerical relays save capital and maintenance costs over electromechanical relays because they have fewer moving parts, are more compact, and require less maintenance, reducing ownership costs.
Electromechanical Relays in Use
- Despite being older technology, tens of thousands of 'silent sentinel' electromechanical relays are still in use worldwide due to their reliability and simplicity, making them a cost-effective solution for many applications.
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