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Questions and Answers
What is the primary function of a protective relay in electrical engineering?
What is the primary function of a protective relay in electrical engineering?
- To supervise microprocessor-based digital protection relays
- To trip a circuit breaker when a fault is detected (correct)
- To generate reverse power flow
- To provide indication of the location and origin of a fault
What were the early protective relays in electrical engineering based on?
What were the early protective relays in electrical engineering based on?
- Microprocessor-based digital devices
- Electromagnetic devices with coils and moving parts (correct)
- Reverse power flow devices
- Solid-state analog devices
What is one advantage of microprocessor-based solid-state digital protection relays over electromechanical relays?
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 (correct)
- They consume less power
- They are less costly to manufacture
- They have a shorter life span
Why do numerical relays save capital and maintenance costs over electromechanical relays?
Why do numerical relays save capital and maintenance costs over electromechanical relays?
Why are tens of thousands of 'silent sentinel' electromechanical relays still in use worldwide?
Why are tens of thousands of 'silent sentinel' electromechanical relays still in use worldwide?
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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Description
Test your knowledge about protective relays in electrical engineering with this quiz. Learn about the functionality and evolution of protective relays from electromagnetic devices to microprocessor-based solid-state digital protection relays.
