Device Numbers Flashcards
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TIME-DELAY STARTING OR CLOSING RELAY - one which gives a desired amount of time delay between operations in an automatic sequence
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MASTER ELEMENT - initiating device to place an equipment in or out of operation
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Reserved for future applications
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MASTER CONTACTOR OR RELAY - device, generally controlled by device no. 1 to place an equipment into operation under the desired conditions and to take it out of operation under other or abnormal conditions
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STOPPING DEVICE - one whose primary function is to place and hold an equipment out of operation
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STARTING CIRCUIT BREAKER, CONTACTOR OR SWITCH - device whose principle function is to connect a machine to its source of starting voltage
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ANODE CIRCUIT BREAKER - used in the anode circuits of a power rectifier, primarily to interrupt the rectifier circuits on arc back
8
CONTROL POWER SWITCH - manually operated switch or circuit breaker used for the express purpose of connecting and disconnecting the source of control power to and from the control bus or equipment
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REVERSING DEVICE - used to reverse the shunt-field connections of a synchronous converter during the starting sequence or for other special reversing functions
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UNIT SEQUENCE SWITCH - used to change the sequence of placing units in and out of service in multiple-unit equipments
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CONTROL POWER TRANSFORMER - serves as the source of a-c control power for operating a-c devices
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OVERSPEED DEVICE - is a direct connected speed switch which functions on machine overspeed
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SYNCHRONOUS-SPEED DEVICE - is one which operates at approximately normal synchronous speed of a machine
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UNDERSPEED DEVICE - functions on machine speed below a desired value
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SPEED REGULATING DEVICE - functions to hold the speed or frequency of a machine or system at a certain value or between certain limits
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BATTERY-CHARGING CONTROL DEVICE - is the battery charger
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SERIES FIELD SHUNTING CIRCUIT BREAKER OR CONTACTOR - serves to open and close a shunt circuit around a machine series field
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ACCELERATING OR DECELERATING CIRCUIT BREAKER, CONTACTOR, OR RELAY - one which is used to close or cause the closing of circuits for bringing a machine up to speed or shutting it down
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STARTING TO RUNNING TRANSITION CONTRACTOR OR RELAY - operates to cause the transfer of a machine from the starting to the running power connections
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ELECTRICALLY OPERATED VALVE - solenoid or motor operated valve
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IMPEDANCE RELAY - functions when the circuit impedance increases or decreases to a predetermined value
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EQUALIZER CIRCUIT BREAKER OR CONTACTOR - serves to make and break the equalizer or current-balancing connections for machine field, or voltage regulators
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TEMPERATURE REGULATING DEVICE - functions to hold the temperature of a machine or other apparatus between certain limits
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BUS TIE CIRCUIT BREAKER, CONTACTOR, OR SWITCH - serves to connect buses or bus sections together
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SYNCHRONIZING OR PARALLEL DEVICE - operates when two a-c circuits are within the desire limits of voltage, frequency, and/or phase angle, to permit the paralleling of these two circuits
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APPARATUS THERMAL DEVICE - one which functions at desired operating-temperature values or limits
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A-C UNDERVOLTAGE RELAY - functions on a given value of single-phase a-c under-voltage
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RESISTOR THERMAL DEVICE - functions upon excessive load indicating, limiting, or shifting resistor temperature
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ISOLATING CIRCUIT BREAKER, CONTACTOR, OR SWTICH - is used for the purpose of disconnecting one circuit from another
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ANNUNCIATOR RELAY - is a nonautomatic reset device with visual indications upon the functioning of protective devices
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SEPARATE EXCITATION DEVICE - connects a circuit such as a synchronous converter shunt field to a source of separate excitation during the starting sequence, or for energizing the excitation and ignition circuits of a power rectifier
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D-C REVERSE POWER RELAY OR DEVICE - one which functions on a given value of d-c reverse power
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POSITION SWITCH - one which makes or breaks contact when the main device or piece of apparatus, which has no device-function number, reaches a given position
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MOTOR-OPERATED SEQUENCE SWITCH - one which fixes the operating sequence of the major devices during starting and stopping, or during other sequential-switching operations
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BRUSH-OPERATING OR SLIP-RING SHORT-CIRCUITING DEVICE - one for raising, lowering, or shifting the brushes of a machine, or for short-circuiting the slip rings.
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POLARITY DEVICE - one which operates or permits the operation of another device on a given polarity only
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UNDERCURRENT OR UNDERPOWER RELAY - one which functions on a given minimum of current or power flow
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BEARING THERMAL DEVICE - one which functions on excessive bearing temperatures
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FIELD REDUCING CONTACTOR - one which inserts resistance in the field circuit of a machine or otherwise reduces its field excitation
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FIELD RELAY - one which functions on a given value of machine field current
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FIELD CIRCUIT BREAKER, CONTACTOR, OR SWITCH - is a device which functions to apply, and/or remove, the machine field excitation
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RUNNING CIRCUIT BREAKER, CONTACTOR, OR SWITCH - is a device whose principal function is to connect a machine to its source of running voltage
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TRANSFER DEVICE - manually operated device which transfers the control circuits to modify the plan of operation of the switching equipment
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UNIT SEQUENCE STARTING CONTACTOR OR RELAY - functions to start the next available unit in a multiple-unit equipment on failure or nonavailabilty of normally preceding units
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D-C OVERVOLTAGE RELAY - functions on a given value of d-c circuit over-voltage
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REVERSE-PHASE, PHASE-BALANCE CURRENT, OR POWER RECTIFIER MISFIRE RELAY - functions on polyphase current of reverse-phase sequence, or on polyphase current unbalance, or on failure of one or more of the power rectifier anodes to fire
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SINGLE- OR REVERSE-PHASE VOLTAGE RELAY - functions upon a given value of polyphase voltage of the desired phase sequence
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INCOMPLETE SEQUENCE RELAY - returns the equipment to the normal, or off, position and locks it out if the normal starting, or operating, or stopping sequence is not properly completed within a predetermined time
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A-C THERMAL RELAY OR DEVICE - functions when the temperature of the a-c machine or apparatus exceeds a given value
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SHORT-CIRCUIT SELECTIVE RELAY OR DEVICE - functions instantaneously on an excessive value of current, or on an excessive rate of current rise, indicating a fault in the circuit being protected
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AC OVERCURRENT RELAY - functions when the current in an ac circuit exceeds a given value
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AC CIRCUIT BREAKER OR CONTACTOR - principle function is usually to interrupt short-circuit or fault currents.
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EXCITER OR GENERATOR RELAY - forces the building up of the dc machine field during starting and/or functions when the machine voltage has built up to a given value
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HIGH-SPEED CIRCUIT BREAKER - circuit breaker which starts to reduce the current in the main circuit in 0.01 second or less, after the occurrence of the dc overcurrent or the excessive rate of current rise
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POWER-FACTOR RELAY - operates on a given power factor in an ac circuit
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FIELD APPLICATION RELAY OR DEVICE - used to control automatically the application of ac motor field excitation at some predetermined point in the slip cycle
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Reserved for future application
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Reserved for future application
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AC OVERVOLTAGE RELAY - functions on a given value of ac overvoltage
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VOLTAGE BALANCE RELAY - operates on a difference in voltage between two circuits
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CURRENT BALANCE RELAY - Operates on difference in current input or output of two circuits
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TIME DELAY STOPPING OR OPENING RELAY - serves in conjunction with the device which initiates the shutdown, or stopping, or opening in an automatic sequence
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FLUID PRESSURE, LEVEL, OR FLOW RELAY - operates on a given value of fluid or gas pressure, or flow, or fluid level
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GROUND PROTECTIVE RELAY - functions on failure of the insulation of a machine, transformer, or other apparatus to ground, or on flashover of a dc machines to ground. This function is however, not applied for the residual or secondary neutral circuit of current transformers
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GOVERNOR - is the equipment which controls the gate or valve opening of a prime mover
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NOTCHING RELAY - Functions to allow only a specified number of operations of a given device or equipment, or a specified number of successive operations within a given time of each other
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AC POWER DIRECTIONAL OR AC POWER DIRECTIONAL OVERCURRENT RELAY - Functions on a desired value of power flow or on a desired value of overcurrent with ac power flow, in a given direction
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DC THERMAL RELAY OR DEVICE - functions when the temperature of the dc machine exceeds a given value
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PERMISSIVE CONTROL DEVICE - is generally a two position, manually operated switch which permits the closing of a circuit breaker, or the placing of an equipment into operation in one position and in the other position prevents operating the circuit breaker or the equipment
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ELECTRICALLY OPERATED RHEOSTAT - used to vary the resistance of a circuit in response to some means of electrical control
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D-C LINE EMERGENCY CIRCUIT BREAKER OR CONTACTOR - used to interrupt a d-c power circuit under emergency conditions, such as overspeed
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D-C LINE CIRCUIT BREAKER OR CONTACTOR - used to close and interrupt a d-c power circuit under normal conditions and/or to interrupt this circuit under emergency conditions
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LOAD RESISTOR CIRCUIT BREAKER OR CONTACTOR - used to shunt or insert a step of load limiting, shifting, or indicating resistance in a power circuit, or to switch a space heater in circuit
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ALARM RELAY - is one other than an annunciator which is used to operate, or to operate in connection with, a visual or audible alarm
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POSITION CHANGING MECHANISM - used for moving a removable circuit breaker unit to and from the connected, disconnected, and test positions
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D-C OVERCURRENT RELAY - functions when the current in a d-c circuit exceeds a given value
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IMPULSE TRANSMITTER - generates and transmits impulses over a telemetering or pilot-wire circuit to the remote indicating or receiving device
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PHASE-ANGLE MEASURING RELAY - functions at a predetermined phase angle between voltages or currents
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A-C RECLOSING RELAY - controls the reclosing and locking out of a a-c circuit interrupter
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D-C UNDERVOLTAGE RELAY OR DEVICE - functions on a given value of d-c undervoltage
81
FREQUENCY DEVICE - functions on a given value of frequency either under, over, or normal
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DC RECLOSING RELAY - controls the closing and reclosing of a dc circuit interrupter, generally in response to load circuit conditions
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SELECTIVE CONTROL, OR TRANSFER, CONTACTOR OR RELAY - operates to select automatically between sources or conditions in an equipment, or performs automatically a transfer operation
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OPERATING MECHANISM - the complete electrical mechanism, including the operating motor, position switches, etc, for a tap changer, induction regulator or similar apparatus
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CARRIER or PILOT-WIRE RECEIVER RELAY - operated or restrained by a blocking signal used in connection with carrier current or d-c pilot-wire fault directional relaying
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LOCKING-OUT RELAY OR DEVICE - an electrically operated hand or electrically reset relay or device which functions to shut down and hold an equipment out of service on the occurrence of abnormal conditions
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DIFFERENTIAL CURRENT RELAY - a fault-detecting relay which functions on a differential current of a given percentage or amount
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AUXILIARY MOTOR OR MOTOR GENERATOR - used for operating auxiliary equipment such as pumps, blowers, exciters, etc.
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LINE SWITCH - used as a disconnecting or isolating switch in an ac or dc power circuit
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REGULATING DEVICE - functions to regulate a quantity such as voltage, current, power, etc, at a certain value or between certain limits
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DC VOLTAGE DIRECTIONAL RELAY - operates when the dc voltage across an open circuit breaker or contactor exceeds a given value in a given direction
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DC VOLTAGE AND CURRENT DIRECTIONAL RELAY - operates in one manner when the dc voltage across an open circuit breaker or contactor exceeds a given value in a given direction, and operates in the opposite manner when the current in the circuit, after the circuit breaker or contactor is closed, exceeds a given value in the opposite direction
93
FIELD CHANGING CONTACTOR OR RELAY - functions to change the value of excitation on a machine
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TRIPPING OR TRIP-FREE RELAY OR CONTACTOR - functions to trip a circuit breaker, contractor, or equipment, or to prevent immediate reclosure of a circuit interrupter, in case it opens on overload, even though the original closing circuit is maintained
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RESERVED FOR SPECIAL APPLICATION
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RESERVED FOR SPECIAL APPLICATION
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RESERVED FOR SPECIAL APPLICATION
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RESERVED FOR SPECIAL APPLICATION
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RESERVED FOR SPECIAL APPLICATION
