devive function numbers

8/3/2019 Devive Function Numbers

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DEVICE UNCTION UMBERS,FOR

,NII.L,.IIONEIWCE POWERDISTRIBUTION QUIPMENTm4GIHCEllNGII~IONPURPOSE OF DEVICE FUNCTION NUMBERA system of nomenclature known as device func-tion.numbering has been devised. It provides ameans of quickly grasping the main purpose of anydevice used as a part of an automatic and manualstation control, supervisory, and associated tele-metering equipment. This system, first developedin connection with automatic switchgear, is nowapplied to all types of power distribution equip-ment, It is based on the assignment of a standardnumber to each of the several fundamental func-tions performed by the component elements of acomplete equipment.These device functions may refer-to the actualfunction the device performs in an equipment orthey may refer to the electrical or other quantityto which the device is responsive. Hence, theremay be in some instances a choice of the functionnumber used for a given device. The preferablechoice, in all cases, is the one which is recog-nized to have the narrowest interpretation so thatit most specifically identifies the device in theminds of all individuals concerned with the designand operation of the equipment.The device function numbers with appropriate suf-fix letter o r letters, where necessary, are usedon electrical diagrams, in instruction books andin specifications.The items included in this publication are fromManual and Automatic Station Control, Supervi-sory, and Associated Telemetering Equipment,c37.2 - 1970. Complete copies of the standardare available from the American National Stan-dards Institute, Inc. , 1430 Broadway, New York,NY 10018

STANDARD DEVICE FUNCTION NUMBERSDevice function numbers, each with its correspond-ing function name and the general description ofeach function, are listed in this publication.When alternate names and descriptions are in-cluded under the function, only the name and de-scription which applies to each specific caseshould be used. In general, only one name foreach device such as, relay, contactor, circuitbreaker, switch, or device, is included in each

0 1975 General Electric Co.E-202 (rev. 12/74)

function designation. However, when the functionis inherently not restricted to any specific type ofdevice and where the type of device itself is thusmerely incidental, any one of these alternativenames, as applicable, may be substituted. Forexample, if for device function 6 a contactor isused for the purpose in place o f a circuit breaker,the function name should be specified as StartingContactor.Numbers from 95 to 99 should be assigned only forthose functions in specific cases where none of theassigned standard device function numbers areapplicable. Numbers which are reserved forfuture application should not be used.DEVICENUMBER FUNCTION AND DESCRIPTION

0

0

0

.O

MASTER ELEMENT is the initiatingdevice, such as a control switch, volt-age relay, float switch, etc, whichserves either directly or through suchpermissive devices as protective andtime-delay relays to place an equipmentin or out of operation.TIME- DELAY STARTING OR CLOSINGRELAY is a device that functions to givea desired amount of time delay be foreor after any point of operation in aswitching sequence or protective relaysystem, except as specifically providedby device functions 48, 62 and 79.CHECKING OR INTERLOCKING RELAYis a relay that operates in response tothe position of a number of other devices(or to a number. of predetermined con-ditions) in an equipment, to allow anoperating sequence to proceed, or tostop, or to provide a check of the posi-tion of these devices or of these condi-tions for any purpose.MASTER CONTACTOR is a device,generally controlled by device function1 or the equivalent and the requiredpermissive and protective devices, thatserves to make and break the necessarycontrol circuits to place an equipmentinto operation under the desired condi-tions and to take it out of operation underother or abnormal conditions.

1


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EVICE FUNCTION NUMBERS FOROWER DISTRIBUTION EQUIPMENT

EVICE DEVICEUMBER FUNCTION AND DESCRIPTION NUMBER FUNCTION AND DESCRIPTION05

00

0a

000010203

04

STOPPING DEVICE is a control deviceused primarily to shut down an equip-ment and hold it out of operation. [Thisdevice may be manually or electricallyactuated, but excludes the function ofelectrical lockout (see device function86) on abnormal conditions.]STARTING CIRCUIT BREAKER is adevice whose principal function is toconnect a machine to its source of start-ing voltage.ANODE CIRCUIT BREAKER is a deviceused in the anode circuits of a powerrectifier for the primary purpose ofinterrupting the rectifier circuit if anarc-back should occur.CONTROL POWER DISCONNECTINGDEVICE is a disconnecting device, suchas a knife switch, circuit breaker, orpull-out fuse block, used for the purposeof respectively connecting and discon-necting the source of control power toand from the control bus or equipment.Note: Control power is considered toinclude auxiliary power which suppliessuch apparatus as small motors andheaters.REVERSING DEVICE is a device that isused for the purpose of reversing a ma-chine field or for performing any otherreversing functions.UNIT SEQUENCE SWITCH is a switchthat is used to change the sequence inwhich units may be placed in and out ofservice in multiple-unit equipments.RESERVED FOR FUTURE APPLICA-TION .OVER-SPEED DEVICE is usually adirect- connected speed switch whichfunctions on machine overspeed.SYNCHRONOUS-SPEED DEVICE is adevice such as a centrifugal-speedswitch, a slip-frequency relay, a volt-age relay, an undercurrent relay, orany type of device that operates atapproximately the synchronous speed ofa machine.UNDER-SPEED DEVICE is a device thatfunctions when the speed of a machinefalls below a pre-determined value.

05

0607

0a

09

000102

03

SPEED OR FREQUENCY MATCHINGDEVICE is a device that functions tomatch and hold the speed or the frequencyof a machine or of a system equal to, orapproximately equal to, that of anothermachine, source, or system.RESERVED FOR FUTURE APPLICA-TION .SHUNTING OR DISCHARGE SWITCH isa switch that serves to open or to closea shunting circuit around any piece ofapparatus (except a resistor), such asa machine field, a machine armature, acapacitor, or a reactor.Note: This excludes devices that per-form such shunting operations as maybe necessary in the process of startinga machine by devices 6 or 42, or theirequivalent, and also excludes devicefunction 73 that serves for the switchingof resistors.ACCELERATING OR DECELERATINGDEVICE is a device that is used to closeor to cause the closing of circuits whichare used to increase or decrease thespeed of a machine.STARTING- TO- RUNNING TRANSITIONCONTACTOR is a device that operatesto initiate or cause the automatic trans-fer of a machine from the starting tothe running power connection.VALVE is one used in a vacuum, air,gas, oil, or similar line, when it iselectrically operated or has electricalaccessories such as auxiliary switches.DISTANCE RELAY is a relay that func-tions when the circuit admittance, im-pedance, or reactance increases or de-creases beyond predetermined limits.EQUALIZER CIRCUIT BREAKER is abreaker that serves to control or tomake and break the equalizer or thecurrent- balancing connections for a ma-chine field, or for regulating equipment,in a multiple-unit installation.TEMPERATURE CONTROL DEVICE isa device that functions to raise or lowerthe temperature of a machine or otherapparatus, or of any medium? when itstemperature falls below, or rises above,a predetermined value.

E-202


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DEVICE FUNCTION NUMBERS FORPOWER DISTRIBUTION EQUIPMENT

DEVICE DEVICENUMBER FUNCTION AND DESCRIPTION NUMBER FUNCTION AND DESCRIPTION

03Contd. Note: An example is a thermostat thatswitches on a space heater in a switch-gear assembly when the temperaturefalls to a desired value as distinguishedfrom a device that is used to provideautomatic temperature regulation be-tween close limits and would be desig-nated as device function 90T.

energizes the excitation and ignition cir-cuits of a power rectifier.02

0405

DIRECTIONAL POWER RELAY is adevice that functions on a desired valueof power flow in a given direction orupon reverse power resulting from arc-back in the anode or cathode circuits ofa power rectifier.RESERVED FOR FUTURE APPLICA-TION. 03SYNCHRONIZING OR SYNCHRONISM-CHECK DEVICE is a device that oper-ates when two a-c circuits are withinthe desired limits of frequency, phaseangle, or voltage, to permit or to causethe paralleling of these two circuits.

POSITION SWITCH is a switch thatmakes or breaks contact when the maindevice or piece of apparatus which hasno device function number reaches agiven position.04

06 APPARATUS THERMAL DEVICE is adevice that functions when the tempera-ture of the shunt field or the amortisseurwinding of a machine, or that of a loadlimiting or load shifting resistor or of aliquid or other medium, exceeds a pre-determined value; or if the temperatureof the protected apparatus, such as apower rectifier, or of any medium de-creases below a predetermined value.

MASTER SEQUENCE DEVICE is a de-vice such as a motor-operated multi-contact switch, or the equivalent, or aprogramming device, such as a com-puter, that establishes or determinesthe operating sequence of the major de-vices in an equipment during startingand stopping or during other sequentialswitching operations.05

0708

UNDERVOLTAGE RELAY is a relaythat functions on a given value of under-voltage.

BRUSH-OPERATING OR SLIP-RINGSHORT-CIRCUITING DEVICE is a devicefor raising, lowering, or shifting thebrushes of a machine, or for short-cir-cuiting its slip rings, or for engaging ordisengaging the contacts of a mechanicalrectifier.

FLAME DETECTOR is a device thatmonitors the presence of the pilot ormain flame in such apparatus as a gasturbine or a steam boiler.06

09 ISOLATING CONTACTOR is a devicethat is used expressly for disconnectingone circuit from another for the purposesof emergency operation, maintenance,or test.

POLARITY OR POLARIZING VOLTAGEDEVICE is a device that operates, orpermits the operation of, another deviceon a predetermined polarity only, or ver-ifies the presence of a polarizing voltagein an equipment.07

00UNDERCURRENT OR UNDERPOWERRELAY is a relay that functions when thecurrent or power flow decreases belowa predetermined value.ANNUNCIATOR RELAY is a nonauto-matically reset device that gives a num-ber of separa te visual indications uponthe functioning of protective devices,and which may also be arranged to per-form a lockout function.

08

01 SEPARATE EXCITATION DEVICE is adevice that connects a circuit, such asthe shunt field of a synchronous conver-ter, to a source of separate excitationduring the starting sequence; or one that

BEARING PROTECTIVE DEVICE is adevice that functions on excessive bear-ing temperature, or on other abnormalmechanical conditions associated withthe bearing, such as undue wear, whichmay eventually result in excessive bear-ing temperature or failure.09 MECHANICAL CONDITION MONITORis a device that functions upon the oc-currence of an abnormal mechanical

E-202


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GVICE FUNCTION NUMBERS FOR3WER DISTRIBUTION EQUIPMENT

EVICE DEVICEUMBER FUNCTION AND DESCRIPTION NUMBER FUNCTION AND DESCRIPTION

00

0102

03

04

05

06

condition (except that associated withbearings as covered under device func-tion 38), such as excessive vibration,eccentricity, expansion, shock, tilting,or seal failure.FIELD RELAY is a relay that functionson a given or abnormally low value orfailure of machine field current, or onexcessive value of the reactive com-ponent of armature current in an a-cmachine indicating abnormally low fieldexcitation.FIELD CIRCUIT BREAKER is a devicethat functions to apply or remove thefield excitation of a machine.RUNNING CIRCUIT BREAKER is a de-vice whose principal function is to con-nect a machine to its source of runningor operating voltage. This function mayalso be used for a device, such as a con-tactor, that is used in series with a cir-cuit breaker or other fault protectingmeans, primarily for frequent openingand closing of the circuit.MANUAL TRANSFER OR SELECTORDEVICE is a manually operated devicethat transfers the control circuits inorder to modify the plan of operation ofthe switching equipment or of some ofthe devices.UNIT SEQUENCE STARTING RELAYis a relay that functions to start the nextavailable unit in a multiple-unit equip-ment upon the failure or nonavailabilityof the normally preceding unit.ATMOSPHERIC CONDITION MONITORis a device, that functions upon the OC-currence of an abnormal atmosphericcondition, such as damaging fumes, ex-plosive mixtures, smoke, or fire.REVERSE- PHASE OR PHASE- BALANCECURRENT RELAY is a relay that func-tions when the polyphase currents are ofreverse-phase sequence, or when thepolyphase currents are unbalanced orcontain negative phase- sequence com-ponents above a given amount.

0708

09

00

0 1

02

03

04

PHASE-SEQUENCE VOLTAGE RELAYis a relay that functions upon a pre-determined value of polyphase voltagein the desired phase sequence.INCOMPLETE SEQUENCE RELAY is arelay that generally returns the equip-ment to the normal, or off, position andlocks it out if the normal starting, oper-ating, or stopping sequence is not prop-erly comp leted within a predeterminedtime. If the device is used for alarmpurposes only, it should preferably bedesignated as 48A (alarm).MACHINE OR TRANSFORMER THER-MAL RELAY is a relay that functionswhen the temperature of a machine arm-ature or other load-carrying winding orelement of a machine or the temperatureof a power rectifier or power trans-former (including a power rectifiertransformer) exceeds a predeterminedvalue.INSTANTANEOUS OVERCURRENT ORRATE-OF-RISE RELAY is a relay thatfunctions instantaneously on an excessivevalue of current or on an excessive rateof current rise, thus indicating a faultin the apparatus or circuit being pro-tected.A-C TIME OVERCURRENT RELAY isa relay with either a definite or inversetime characteristic that functions whenthe current in an a-c circuit exceeds apredetermined value.A-C CIRCUIT BREAKER is a devicethat is used to close and interrupt an a-cpower circuit under normal conditionsor to interrupt this circuit under faultor emergency conditions.EXCITER OR D-C GENERATOR RE-LAY is a relay that forces the d-c ma-chine field excitation to build up duringstarting or which functions when themachine voltage has been built up to agiven value.RESERVED FOR FUTURE APPLICA-TION.

E-202


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DEVICE DEVICENUMBER FUNCTION AND DESCRIPTION NUMBER FUNCTION AND DESCRIPTION

0506

07

08

09000102

0304

E-202

POWER FACTOR RELAY is a relay thatoperates when the power factor in an a-ccircuit rises above or falls below a pre-determined value.FIELD APPLICATION RELAY is a re-lay that automatically controls the appli-cation of the field excitation to an a-cmotor at some predetermined point inthe slip cycle.SHORT- CIRCUITING OR GROUNDINGDEVICE is a primary circuit switchingdevice that functions to short-circuit orto ground a circuit in response to auto-matic or manual means.RECTIFICATION FAILURE RELAY isa device that functions if one or moreanodes of a power rectifier fail to fire,or to detect an arc-back or on failure ofa diode to conduct or block properly.OVERVOLTAGE RELAY is a relay thatfunctions on a given value of overvoltage.VOLTAGE OR CURRENT BALANCERELAY is a relay that operates on agiven difference in voltage, or currentinput or output, of two circuits.RESERVED FOR FUTURE APPLICA-TION.TIME-DELAY STOPPING OR OPENINGRELAY is a time-delay relay that servesin conjunction with the device that ini-tiates the shutdown, stopping, or openingoperation in an automatic sequence orprotective relay system.LIQUID OR GAS PRESSURE OR VAC-UUM RELAY is a relay that operates ongiven values of liquid or gas pressure oron given rates of change of these values.GROUND PROTECTIVE RELAY is arelay that functions on failure of the in-sulation of a machine, transformer, orof other apparatus to ground, or onflashover of a d-c machine to ground.Note: This function is assigned only toa relay that detects the flow of currentfrom the frame of a machine or enclos-ing case or structure of a piece of ap-paratus to ground, :;r dct-ycts a groundon a normally ungrLlu::Citiil -yinding tjl

05

06

0708

09

00

01

circuit. It is not applied to a device con-nected in the secondary circuit of a cur-rent transformer, or in the secondaryneutral of current transformers, con-nected in the power circuit of a normallygrounded system.GOVERNOR is the assembly of fluid,electrical, or mechanical control equip-ment used for regulating the flow ofwater, steam, or other medium to theprime mover for such purposes as start-ing, holding speed or load, or stopping.NOTCHING OR JOGGING DEVICE is adevice that functions to allow only aspecified number of operations of a givendevice, or equipment, or a specifiednumber of successive operations withina given time of each other. It is also adevice that functions to energize a cir-cuit periodically or for fractions ofspecified time intervals, or that is usedto permit intermittent acceleration orjogging of a machine at low speeds formechanical positioning.A-C DIRECTIONAL OVERCURRENTRELAY is a relay that functions on a de-sired value of a-c over-current flowingin a predetermined direction.BLOCKING RELAY is a relay that ini-tiates a pilot signal for blocking of trip-ping on external faults in a transmissionline or in other apparatus under prede-termined conditions, or cooperates withother devices to block tripping or tobloCk reclosing on an out- of- step condi-tion or on power savings.PERMISSIVE CONTROL DEVICE is gen-erally a two- position, manually-operatedswitch that, in one position, permits theclosing of a circuit breaker, or the plac-ing of an equipment into operation. andin the other position prevents the circuitbreaker or the equipment from beingoperated.RHEOSTAT is a variable resistance de-vice used in an electric circuit, which iselectrically operated o r has other elec-trical accessories, such as auxiliary,position, or limit switches.LIQUID OR GAS-LEVEL RELAY is aretay that operates on given values of

5


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)EV-iCE FUNCTION NUMBERS FOROWER DISTRIBUTION EQUIPMENT

lEVICEUMBER FUNCTION AND DESCRIPTION

02

03

04

05

060708

0900

liquid or gas level or on given rates ofchange of these values.D-C CIRCUIT BREAKER is a circuitbreaker that is used to close and inter-rupt a d- c power circuit under normalconditions or to interrupt this circuitunder fault or emergency conditions.LOAD-RESISTOR CONTACTOR is a con-tactor that is used to shunt or insert astep of toad limiting, shifting, or indi-cating resistance in a power circuit, orto switch a space heater in circuit, or toswitch a light or regenerative load re-sistor of a power rectifier or other ma-chine in and out of circuit.ALARM RELAY is a relay other than anannunciator, as covered under devicefunction 30, that is used to operate, orto operate in connection with, a visualor audible alarm.POSITION CHANGING MECHANISM isa mechanism that is used for moving amain device from one position to anotherin an equipment; as for example, shiftinga removable circuit breaker unit to andfrom the connected, disconnected, andtest positions.D-C OVERCURRENT RELAY is a relaythat functions when the current in a d-ccircuit exceeds a given value.PULSE TRANSMITTER is used to gen-erate and transmit pulses over a tele-metering or pilot-wire circuit to the re-mote indicating or receiving device.PHASE-ANGLE MEASURING OR OUT-OF-STEP PROTECTIVE RELAY is arelay that functions at a pre-determinedphase angle between two voltages or be-tween two currents or between voltageand current.A-C RECLOSING RELAY is a reiay thatcontrols the automatic reclosing andlocking out of an a-c circuit interrupter.LIQUID OR GAS FLOW RELAY is a re-lay that operates on given values of liquidor gas flow or on given rates of changeof these values.

DEVICE UMBER FUNCTION AND DESCRIPTION

01

02

03

04

05

06

07

08

09

FREQUENCY RELAY is a relay thatfunctions on a predetermined value offrequency (either under or over or onnormal system frequency) or rate ofchange of frequency.D-C RECLOSING RELAY is a relay thatcontrols the automatic closing and re-closing of a d-c circuit interrupter, gen-erally in response to load circuit condi-tions.AUTOMATIC SELECTIVE CONTROLOR TRANSFER RELAY is a relay thatoperates to select automatically betweencertain sources or conditions in an equip-ment, or performs a transfer operationautomatically.OPERATING MECHANISM is the com-plete electrical mechanism or servo-mechanism, including the operating mo-tor, solenoids, position switches, etc,for a tap changer, induction regulator,or any similar piece of apparatus whichotherwise has no device function number.CARRIER OR PILOT- WIRE RECEIVERRELAY is a relay that is operated orrestrained by a signal used in connectionwith carrier- current or d-c pilot-wirefault directional relaying.LOCKING-OUT RELAY is an electricallyoperated hand, or electrically, reset re-lay or device that functions to shut downor hold an equipment out of service, orboth, upon the occurrence of abnormalconditions.DIFFERENTIAL PROTECTIVE RELAYis a protective relay that functions on apercentage or phase angle or other quan-titative difference of two currents or ofsome other electrical quantities.AUXILIARY MOTOR OR MOTOR GEN-ERATOR is one used for operating aux-iliary equipment, such as pumps!blowers, exciters, rotating magneticamplifiers, etc.LINE SWITCH is a switch used as a dis-connecting. load-interrup ter, or isolatingswitch in an a-c or d-c power circuit,when this device is electrically opera ted

F-202


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DEVICENUMBER FUNCTION AND DESCRIPTION

00

01

02

0304

or has electrical accessories, such asan auxiliary switch, magnetic lock, etc.REGULATING DEVICE is a device thatfunctions to regulate a quantity, or quan-tities, such as voltage, current, power,speed, frequency, temperature, andload, at a cei-tain value or between cer-tain (generally close) limits for machines,tie lines or other apparatus.VOLTAGE DIRECTIONAL RELAY is arelay that operates when the voltageacross an open circuit breaker or con-tactor exceeds a given value in a givendirection.VOLTAGE AND POWER DIRECTIONALRELAY is a relay that permits or causesthe connection of two circuits when thevoltage difference between them exceedsa given value in a predetermined direc-tion and causes these two circuits to bedisconnected from each other when thepower flowing between them exceeds agiven value in the oppos ite direction.FIELD- CHANGING CONTACTOR is acontactor that functions to increase ordecrease, in one step, the value o f fieldexcitation on a machine.TRIPPING OR TRIP-FREE RELAY is arelay that functions to trip a circuitbreaker, contactor, or equipment, or topermit immediate tripping by other de-vices; or to prevent immediate reclosureof a circuit interrupter if it should openautomatically even though its closing cir-cuit is maintained closed.

95 *96 *

98 *I

*Used only for specific applicationsin individual installations wherenone of the assigned numberedfunctions from 1 to 94 are suitable.97 *

99 * JSUPERVISORY CONTROL AND INDICATIONA similar series of numbers, prefixed by the let-ters RE (for remote) shall be used for the inter-posing relays performing functions that are con-trolled directly from the supervisory system.E-202

Typical examples of such device functions are:REl, RE5, and RE94.Note: The use of the RE prefix for thispurpose in place of the former 200 seriesof numbers now makes it possible to ob-tain increased flexibility of the devicefunction numbering system. For example,in pipeline pump stations, the numbers 1through 99 are applied to device functionsthat are associated with the over-all sta-tion operation. A similar series of num-bers, starting with 101 instead of 1, areused for those device functions that areassociated with unit 1; a similar seriesstarting with 201 for device functions thatare associated with unit 2; and so on, foreach unit in these installations.

SUFFIX LETTERSSuffix letters may be used with device function num-bers for various purposes. They permit a mani-fold multiplication of available function designationsfor the large number and variety of devices used inthe many types of equipment covered by this stan-dard. They may also serve to denote individual orspecific parts or auxiliary contacts of these devicesor certain distinguishing features, characteristics,or conditions which describe the use of the deviceor its contacts in the equipment.Letter suffixes should, however, be used only when they accomplish a useful purpose. For example,when all of the devices in an equipment are asso-ciated with only one kind of appara tus, such as afeeder or motor or generator, it is common IJrac-tice, in order to retain maximum simplicity in de-vice function identification, not to add the respec-tive suffix letter F or M or G to any of the devicefunction numbers.

In order to prevent any possible conflict or con-fusion, each suffix should preferably have only onemeaning in an individual equipment. To accomplishthis, short distinctive abbreviations, such as con-tained in American Standard Abbreviations for Useon Drawings, 232.13-1950, or any appropriatecombination of letters, may also be used as lettersuffixes, where necessary. However, each suffixshould not consist of more than three (and prefer-ably not more than two) letters, in order to keep thecomplete function designation as short and simpleas possible.

The meaning of each suffix used with a device func-tion number should be designated in the followingmanner on the necessary drawings or publicationsapplying to the equipment: TC, Trip Coil: V. Volt-age: X, Auxiliary Relay.7


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In the cases where the same suffix (consisting ofone letter or a combination qf letters) hae differentmeanings in the same equipment, depending uponthe device function number with which it is used,then the complete device function number with itssuffix letter or letters and its corresponding func-tion name should be listed in the legend in eachcase. as follows: 63V. Vacuum Relay: 70R. Rais-ing Relay for Device 70: 9OV, Voltage Regulator.

Note: Letter suffixes used with specificdevice function numbers for a typical ap-plication, namely pipeline pump installa-tions, are listed in Proposed Device Num-bers and Functions for Pipeline Pump Sta-tions under Automatic or Remote Control,American Institute of Electrical EngineersPublication 68. February, 1958.

AUXILIARY DEVICESThese letters denote separate auxiliary devices,such as:CCLcsDL0OPPBRUXYZ

Closing Relay or ContactorAu.xiliary Relay, Closed (energized whenmain device is in closed position)Control SwitchDown Position Switch RelayLowering RelayOpening Relay or ContactorAuxiliary Relay, Open (energized when maindevice is in open position)Push ButtonRaising RelayUp Position Switch RelayAuxiliary Relay

Note: In the control of a circuit breakerwith a so-called X-Y relay control scheme,the X relay is the device whose main con-tacts are used to energize the closing coilor the device which in some other manner,such as by the release of stored energy,causes the breaker to close. The con-tacts of the Y relay provide the anti-pumpfeature for the circuit breaker.

ACTUATING QUANTITIESThese Letters indicate the condition or electricalquantity to which the device responds, or the med-ium in which the device responds, or the mediumin which it is located, such as:A Air or Amperesc: CurrentE Elec~lrolyte

F Frequency or Flow or FaultL Level or LiquidP Power or PressurePF Power FactorQ OilS SpeedT TemperatureV Voltage or Volts or VacuumVAR Reactive PowerVB VibrationW Water or Watts

MAIN DEVICEThese le tters denote the location of the main devicein the circuit, or the type oi circuit in which thedevice is used, or the type of circuit or appara tuswith which it is associa ted, when this is necessary,such as:AACANBBKBPBTCCADDCEFGHLMNPRSTTHTLTMU

Alarm or Auxiliary PowerAlternating CurrentAnodeBattery or Blower or BusBrakeBypassBus TieCapacitor or Condenser or Compensator orCarrier CurrentCathodeDischargeDirect CurrentExciterFeeder or Field or FilamentGenerator or Ground*Heater or HousingLine or LogicMotor or MeteringNetwork or Neutral*Pump or Phase ComparisonReactor or RectifierSynchronizing or SecondaryTransformer or ThyratronTransformer (High-voltage Side)Transformer {Low- voltage Side)TelemeterIJnit

*Note: Suffix N is generally used inpreference to G for devices connectedin the secondary neutral of currenttransformers, or in the secondary of acurrent transformer whose primarywinding is located in the neutral of amachine or power transformer, exceptin the case of transmission line relaying.where the suffix G is more commonlyused for those relays that operate onground faults. 8 F.. 2(-j:!


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MAIN DEVICE PARTSThese letters denote parts of the main de.rice, di-vided into the two following categories:(1) All parts, such as the following:BKCccHCMMFMLMSSSITCV

BrakeCoil or Condenser or CapacitorClosing CoilHolding CoilOperating MotorFly- ball MotorLoad- limit MotorSpeed Adjusting or Synchronizing MotorSolenoidSeal- inTrip CoilValve

(2) All auxiliary contacts and position and limitswitches for such devices and equipment as cir-cuit breakers, contactors, valves and rheostatsand contacts of relays.a. Contact that is open when the main device is inthe standard reference position, commonly re-ferred to as the nonoperated or de-energizedposition, and that closes when the device as-sumes the opposite position.b. Contact that is closed when the main device isin the standard reference position, commonlyreferred to as the nonoperated or de-energizedposition, and that opens when the device assumesthe opposite position.

Note: The simple designation a or 73 isused in all cases where there is no need toadjust the contacts to change position at anyparticular point in the travel of the main de-vice or where the part of the travel where thecontacts change position is of no significancein the control or operating scheme. Hencethe a and b designations usually are suf-ficient for circuit breaker auxiliary switches.

AUXILIARY SWITCHES FOR CIRCUIT BREAKEROPERATING MECHANISMSFor the mechanically trip-free mechanism of acircuit breaker:aa Contact that is open when the operating mecha-nism of the main device is in the nonoperatedposition and that closes when the operating me-chanism assumes the opposite position.

bb Contact that is closed when the operating me-chanism of the main device is in the nonoperatedposition and that opens when the operating me-chanism assumes the opposite position.The part o f the stroke at which the auxiliary switchchanges position should, if necessary, be specifiedin the description. LC is used to designate thelatch-checking switch of such a mechanism, whichis closed when the mechanism linkage is relatchedafter an opening operation of the circuit breaker.

LIMIT SWITCHESLS designates a limit switch. This is a positionswitch that is actuated by a main device, such as arheostat or valve, at or near its extreme end oftravel. Its usual function is to open the circuit ofthe operating motor at the end of travel of the maindevice, but it may also serve to give an indicationthat the main device has reached an extreme posi-tion of travel.

TORQUE LIMIT SWITCHESThis is a switch that is used to open an operatingmotor circuit at a desired torque limit at the ex-treme end of travel of a main device, such as avalve. It should be designated as follows:twtw

Torque limit switch, opened by torque-respon-sive mechanism, to stop valve closing.Torque limit switch, opened by torque-respon-sive mechanism, to stop valve opening.

OTHER SWITCHESIf several similar auxiliary, position, and limitswitches are present on the same main device,they should be designated with supplementary nu-merical suffixes as 1, 2, 3, etc., when necessary.

OTHER CHARACTERISTICS OR CONDITIONSThe following letters cover all other distinguishingfeatures or characteristics or conditions, notspecifically described previously, which serve- todescribe the use of the device or its contacts in theequipment, such as:A Accelerating or AutomaticB Blocking or BackupC Close or ColdD Decelerating or Detonate or Down or Disengaged

E-202 (rev. 12 7-i) 9


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VICE FUNCTION NUMBERS FORWER DISTRIBUTION EQUIPMENT

Emergency or EngagedFailure or ForwardHot or HighHand ResetHigh SpeedLeft or Local or Low or Lower or LeadingManualOpenF OFFONPolarizingRight or Raise or Reclosing or Receivingor Remote or ReverseSending or SwingTest or Trip or Trailing2 Time-delay Closing3 Time-delay OpeningUP

FIX NUMBERSvo or more devices with the same function num-and suffix letter (if used) are present, in the

same equipment, they may be distinguished bynumbered suffixes, as for example, 4X-1, 4X-2,and 4X-3 when necessary.

DEVICES PERFORMING MORE THANONE FUNCTION ---If one device performs two relatively importantfunctions in an equipment so that it is desirable toidentify both of these functions, a double functionnumber and name, such.as 50/51 Instantaneous andTime Overcurrent Relay, may be used.REPRESENTATION OF DEVICE CONTACTSON ELECTRICAL DIAGRAMS- --

The typical elementary diagram in Figure 1 illus-trates the recommended method of representingthe contacts of typical devices on an elementarydiagram.416OV- JPHASE-3 WIRE-BOHZ BUS PHASE SEOUENCE I 2 3

ft-~52~091N~ cmcurT -+.g TRIPPING CIACUIT~~~.3 2 40.w~~I$~

FT-,-&f$

21:; a$S,*I : SLI *DC SAL1 0-s Ia&SOC2 %1 l&i

: Is. Js-Y*2.1, EL4 2 .)2xI- ; Itl; 4e!+

NOTE: ALTERNATE SYMBOLS ASSHOWN IN AMERICAN NATIONALSTANDARD Y32.2.1967 MAY BEUSEQFOA EXAMPLE,CIRCLESMAY BE USED FOR OPERATING

Figure 1. Typical Elementary Diagram.12/74) GENERAL@ELECTRtC E- 202

devive function numbers

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