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What is the definition of the device number 25?
What is the definition of the device number 63?
What is the definition of the device number 69?
What is the definition of the device number 71?
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What is the definition of the device number 79?
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What is the definition of the device number 27?
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What is the definition of the device number 80?
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What is the definition of the device number 30?
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What is the definition of the device number 83?
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What is the definition of the device number 33?
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What is the definition of the device number 43?
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What is the definition of the device number 86?
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What is the definition of the device number 47?
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What is the definition of the device number 49?
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What is the definition of the device number 90?
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What is the definition of the device number 50?
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What is the definition of the device number 1?
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What is the definition of the device number 51?
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What is the definition of the device number 4?
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What is the definition of the device number 94?
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What is the definition of the device number 8?
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What is the definition of the device number 23?
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What is the definition of the device number 26?
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What is the definition of the device number 21?
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Study Notes
ANSI Device Numbers
- 25: Synchronous device used in synchronizing generators with a power system.
- 63: Monitors liquid or gas pressure in various systems; crucial for operation safety.
- 69: Acts as a permissive control device allowing certain operations under specified conditions.
- 71: Functions as a liquid or gas level relay, ensuring safety and regulation of fluid levels.
- 72: Serves as a DC circuit breaker, protecting electrical circuits by interrupting excessive currents.
- 74: Alarm relay that triggers alarms in case of predetermined conditions being met.
- 79: AC Reclosing Relay that automatically restores power after a temporary fault.
- 27: Undervoltage relay that detects when voltage drops below a set threshold to prevent equipment damage.
- 80: Monitors liquid or gas flow, critical for system efficiency and diagnosis.
- 30: Annunciator relay which signals or indicates the status of a system or device.
- 83: Automatic Selective Control or Transfer Relay that manages power distribution effectively.
- 33: Position switch that detects the position of mechanical components in various applications.
- 84: Operating mechanism that facilitates the actuation of switches or other devices.
- 43: Manual transfer or selector that allows manual switching between power sources or feeds.
- 86: Locking-out relay that ensures systems do not operate until specific conditions are met.
- 87: Differential protective relay sensitive to differences in current, providing protection against faults.
- 47: Undervoltage relay designed for polyphase systems, protecting against multi-phase operation failures.
- 88: Motor generator or auxiliary motor, crucial for backup systems during outages.
- 49: Transformer thermal relay that monitors winding temperature to prevent overheating.
- 90: Regulating device managing system parameters to maintain optimal conditions.
- 50: Instantaneous overcurrent relay ensures immediate tripping during excessive current occurrence.
- 1: 101 switch master element critical for control systems and operational hierarchy.
- 51: Time overcurrent relay that activates based on current and time duration, preventing overloads.
- 52: AC circuit breaker with A and B contacts for multiple circuit management in AC systems.
- 4: Master contactor that serves as a fundamental component for controlling power applications.
- 94: Tripping or trip-free relay that allows relay operation without lockout conditions when fault occurs.
- 8: Control power disconnecting device that safely isolates power in control circuits.
- 23: Temperature control device that regulates temperature in various applications for safety.
- 26: Apparatus thermal device monitoring oil temperature in machinery to prevent overheating.
- 21: Distance relay that measures electrical distance and provides protection against short circuits.
- 81: Frequency relay that monitors system frequency to ensure stability and control.
- 65: Governor used in controlling speed or power output in mechanical systems.
- 11: Multi-function device capable of performing various functions within electrical systems.
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Test your knowledge of ANSI device numbers with this quiz. Each flashcard presents a specific device number along with its definition, helping you to better understand their function and application. Ideal for students and professionals in electrical engineering and control systems.
