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IEEE Device Numbers
Intro to Schematics Quiz Set IEEE Device Numbers
27
Electrical Engineering
Beginner
12/07/2017

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Cards

Term

 

11

Definition

Multifunction Device

-Device that performs three or more comparatively important functions, that could be designated by combining several device numbers.

 

Term

 

21

Definition

Distance Relay

A relay that functions when the circuit admittance, impedance, or reactance increases or decreases beyond predetermined limits.

 

Term

 

23

Definition

Temperature Control Device

A device that functions to raise or lower the temperature of a machine or other apparatus, or of any medium, when it's temperature falls below, or rises above a predetermined value.

Term

 

25

Definition

Synchronizing or Synchronism Check Device

A device that operates when two AC circuits are within the desired limits of Frequency, Phase Angle, or Voltage, to permit or to cause the paralleling of these two circuits.

Term

 

27

Definition

AC Undervoltage Relay

A relay that functions on a given value of AC Undervoltage.

Term

 

30

Definition

Annunciator Relay

a non-automatically reset device that gives a number of separate visual indications upon the functioning of protective devices, and which may be arranged to perform a lockout function.

Term

 

43

Definition

Manual Transfer or Selector Device

A manually operated device that transfers the control circuits in order to modify the plan of operation of the switching equipment or some of the devices.

Term

 

49

Definition

Machine or Transformer Thermal Relay

A relay that functions when the temperature of a machine armature or other load-carrying winding or element of a machine or the temperature of a power rectifier or power transformer (including a power rectifier transformer) exceeds a predetermined value.

 

Term

 

50

 

Definition

Instantaneous Overcurrent or Rate of Rise Relay

A relay that functions instantaneously on an excessive value of current or on an excessive rate of current rise, thus indicating a fault in the circuit being protected.

Term

 

51

Definition

AC Time Overcurrent Relay

A relay with either a definite or inverse time characteristic that functions when the current in a circuit exceeds a predetermined value.

Term

 

52

Definition

AC Circuit Breaker

A device that is used to close and interrupt an AC power circuit under normal conditions or to interrupt this circuit under fault or emergency conditions.

Term

 

59

Definition

Overvoltage Relay

A relay that functions on a given value of overvoltage.

Term

 

62

Definition

Time-Delay or Stopping Relay

A time-delay relay that serves in conjunction with the device that initiates the shutdown, stopping, or opening operation in an automatic sequence or protective relay system.

Term

 

63

Definition

Pressure Switch

A switch that operates on given values or on given rate of change in pressure.

Term

 

67

Definition

AC Directional Overcurrent Relay

A relay that functions on a desired value of an Overcurrent flowing in a predetermined direction.

Term

 

69

Definition

Permissive Control Device

Is generally a two-position manually-operated switch that, in one position permits the closing of a circuit breaker, or placing of an equipment into operation, and in the other position prevents the circuit breaker or the equipment from being operated.

Term

 

71

Definition

Level Switch

A switch which operates on given values, or on a given rate of change, or level.

Term

 

72

Definition

DC Circuit Breaker

A circuit breaker that is used to close and interrupt a DC power circuit under normal conditions or to interrupt this circuit under fault or emergency conditions.

Term

 

74

Definition

Alarm Relay

A relay other than an annunciator, as covered under device function 30, that is used to operate, or to operate in connection with, a visual or audible alarm.

Term

 

79

Definition

AC Reclosing Relay

A relay that controls the automatic reclosing and locking out of an AC circuit interrupter.

Term

 

81

Definition

Frequency Relay

A relay that functions on a predetermined value of frequency (either under, over, or on normal system frequency) or rate of change of frequency.

Term

 

86

Definition

Lockout Relay

An electrically operated hand, or electrically, reset relay or device that functions to shut down or hold an equipment out of service, or both, upon the occurrence of abnormal conditions.

Term

 

87

Definition

Differential Protective Relay

A protective relay that functions on a percentage or phase angle or other quantitative difference of two currents or of some other electrical quantities.

Term

 

89

Definition

Line Switch

A switch used as a disconnecting, load-interrupter, or isolating switch in an AC or DC power circuit, when this device is electrically operated or has electrical accessories, such as an auxiliary switch. magnetic lock, etc.

Term

 

90

Definition

Regulating Device

A device that functions to regulate a quantity, or quantities, such as voltage, current, power, speed, frequency, temperature, and load at a certain value or between certain (generally close) limits for machines, tie lines, or other apparatus.

Term

 

94

Definition

Tripping or Trip-Free Relay

A relay that functions to trip a circuit breaker, contactor, or equipment, or to permit immediate tripping by other devices; or to prevent immediate reclosure of a circuit interrupter if it should open automatically even though its closing circuit is maintained closed.

Term

 

98

Definition

Transfer Trip Equipment

Includes receivers, transmitters, and auxiliary operating and alarm relays.

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