ANSI Device Numbers - Wikipedia, the free encyclopedia

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ANSI Device Numbers

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In the design of electrical power systems, the ANSI Standard Device Numbers (ANSI /IEEEStandard C37.2) denote what features a protective device supports (such as a relay or circuitbreaker). These types of devices protect electrical systems and components from damage when anunwanted event occurs, such as an electrical fault. Device numbers are used to identify the functionsof devices shown on a schematic diagram. Function descriptions are given in the standard.

ANSI/IEEE C37.2-2008 is one of a continuing series of revisions of the standard, which originated in1928.

1 – Master Element2 – Time Delay Starting or Closing Relay3 – Checking or Interlocking Relay4 – Master Contactor5 – Stopping Device6 – Starting Circuit Breaker7 – Rate of Change Relay8 – Control Power Disconnecting Device9 – Reversing Device10 – Unit Sequence Switch11 – Multi-function Device12 – Overspeed Device13 – Synchronous-speed Device14 – Underspeed Device15 – Speed – or Frequency, Matching Device16 – Data Communications Device17 – Shunting or Discharge Switch18 – Accelerating or Decelerating Device19 – Starting to Running Transition Contactor20 – Electrically Operated Valve21 – Distance Relay22 – Equalizer Circuit Breaker23 – Temperature Control Device24 – Volts Per Hertz Relay

[edit]List of device numbers and acronyms

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ANSI Device Numbers - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/ANSI_Device_Numbers[1/15/2013 9:52:27 AM]

25 – Synchronizing or Synchronism-Check Device26 – Apparatus Thermal Device27 – Undervoltage Relay28 – Flame detector29 – Isolating Contactor or Switch30 – Annunciator Relay31 – Separate Excitation Device32 – Directional Power Relay33 – Position Switch34 – Master Sequence Device35 – Brush-Operating or Slip-Ring Short-Circuiting Device36 – Polarity or Polarizing Voltage Devices37 – Undercurrent or Underpower Relay38 – Bearing Protective Device39 – Mechanical Condition Monitor40 – Field (over/under excitation) Relay41 – Field Circuit Breaker42 – Running Circuit Breaker43 – Manual Transfer or Selector Device44 – Unit Sequence Starting Relay45 – Abnormal Atmospheric Condition Monitor46 – Reverse-phase or Phase-Balance Current Relay47 – Phase-Sequence or Phase-Balance Voltage Relay48 – Incomplete Sequence Relay49 – Machine or Transformer, Thermal Relay50 – Instantaneous Overcurrent Relay51 – AC Inverse Time Overcurrent Relay52 – AC Circuit Breaker53 – Exciter or DC Generator Relay54 – Turning Gear Engaging Device55 – Power Factor Relay56 – Field Application Relay57 – Short-Circuiting or Grounding Device58 – Rectification Failure Relay59 – Overvoltage Relay60 – Voltage or Current Balance Relay61 – Density Switch or Sensor62 – Time-Delay Stopping or Opening Relay63 – Pressure Switch64 – Ground Detector Relay65 – Governor66 – Notching or Jogging Device67 – AC Directional Overcurrent Relay68 – Blocking or "Out-of-Step" Relay69 – Permissive Control Device70 – Rheostat71 – Liquid Level Switch72 – DC Circuit Breaker

ANSI Device Numbers - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/ANSI_Device_Numbers[1/15/2013 9:52:27 AM]

73 – Load-Resistor Contactor74 – Alarm Relay75 – Position Changing Mechanism76 – DC Overcurrent Relay77 – Telemetering Device78 – Phase-Angle Measuring Relay79 – AC Reclosing Relay80 – Flow Switch81 – Frequency Relay82 – DC Reclosing Relay83 – Automatic Selective Control or Transfer Relay84 – Operating Mechanism85 – Communications,Carrier or Pilot-Wire Relay86 – Lockout Relay87 – Differential Protective Relay88 – Auxiliary Motor or Motor Generator89 – Line Switch90 – Regulating Device91 – Voltage Directional Relay92 – Voltage and Power Directional Relay93 – Field Changing Contactor94 – Tripping or Trip-Free Relay95 – For specific applications where other numbers are not suitable96 – For specific applications where other numbers are not suitable97 – For specific applications where other numbers are not suitable98 – For specific applications where other numbers are not suitable99 – For specific applications where other numbers are not suitableAFD – Arc Flash DetectorCLK – Clock or Timing SourceDDR – Dynamic Disturbance RecorderDFR – Digital Fault RecorderENV – Environmental DataHIZ – High Impedance Fault DetectorHMI – Human Machine InterfaceHST – HistorianLGC – Scheme LogicMET – Substation MeteringPDC – Phasor Data ConcentratorPMU – Phasor Measurement UnitPQM – Power Quality MonitorRIO – Remote Input/Output DeviceRTU – Remote Terminal Unit/Data ConcentratorSER – Sequence of Events RecorderTCM – Trip Circuit MonitorSOTF – Switch On To Fault

A suffix letter or number may be used with the device number; for example, suffix N is used if the

[edit]Suffixes and prefixes

ANSI Device Numbers - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/ANSI_Device_Numbers[1/15/2013 9:52:27 AM]

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device is connected to a Neutral wire (example: 59N in a relay is used for protection against NeutralDisplacement); and suffixes X,Y,Z are used for auxiliary devices. Similarly, the "G" suffix denotes a"ground", hence a "51G" is a time overcurrent ground relay. Suffix numbers are used to distinguishmultiple "same" devices in the same equipment such as 51-1, 51–2.[1]

Device numbers may be combined if the device provides multiple functions, such as theinstantaneous/time-delay AC over current relay denoted as 50/51.[1]

For device 16, the suffix letters further define the device: the first suffix letter is 'S' for serial or 'E' forEthernet. The subsequent letters are: 'C' security processing function (e.g. VPN, encryption), 'F'firewall or message filter, 'M' network managed function, 'R' router, 'S' switch and 'T' telephonecomponent. Thus a managed Ethernet switch would be 16ESM.

1. ^ a b Applied Protective Relaying 1979 by Westinghouse Electric Corporation, 2nd Printing, "Appendix II,Electrical Power System Device Numbers and Functions" as adopted by IEEE standard and incorporatedin American Standard C37.2-1970.

Categories: Electrical engineering

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