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From Wikipedia, the free encyclopedia

In the design of electrical power systems, the ANSI Standard Device Numbers (ANSI /IEEE Standard C37.2) denote what features a protective devicesupports (such as a relay or circuit breaker). These types of devices protect electrical systems and components from damage when an unwanted eventoccurs, such as an electrical fault. Device numbers are used to identify the functions of devices shown on a schematic diagram. Function descriptions aregiven in the standard.

ANSI/IEEE C37.2-2008 is one of a continuing series of revisions of the standard, which originated in 1928.

List of device numbers and acronyms

1 Master Element2 Time Delay Starting or Closing Relay3 Checking or Interlocking Relay4 Master Contactor 5 Stopping6 Starting Circuit Breaker 7 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 Contactor 20 Electrically Operated Valve21 Distance Relay22 Equalizer Circuit Breaker 23 Temperature Control Device24 Volts Per Hertz Relay25 Synchronizing or Synchronism-Check Device

26 Apparatus Thermal Device27 Undervoltage Relay28 Flame detector 29 Isolating Contactor or Switch30 Annunciator Relay31 Separate Excitation32 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 Monitor 40 Field (over/under excitation) Relay

41 Field Circuit Breaker 42 Running Circuit Breaker 43 Manual Transfer or Selector Device44 Unit Sequence Starting Relay45 Abnormal Atmospheric Condition Monitor 46 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 Breaker 53 Exciter or DC Generator Relay54 Turning Gear Engaging Device55 Power Factor Relay

56 Field Application Relay57 Short-Circuiting or Grounding Device58 Rectification Failure Relay59 Overvoltage Relay

60 Voltage or Current Balance Re lay61 Density Switch or Sensor 62 Time-Delay Stopping or Opening Relay63 Pressure Switch64 Ground Detector Relay65 Governor 66 Notching or Jogging Device67 AC Directional Overcurrent Relay68 Blocking Relay69 Permissive Control Device70 Rheostat71 Liquid Level Switch72 DC Circuit Breaker 73 Load-Resistor Contactor 74 Alarm Relay75 Position Changing Mechanism76 DC Overcurrent Relay77 Telemetering Device78 Phase-Angle Measuring Relay or "Out-of-Step" 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 Generator 89 Line Switch90 Regulating Device91 Voltage Directional Relay92 Voltage and Power Directional Relay93 Field Changing Contactor 94 Tripping or Trip-Free Relay95 For specific applications where other numbers are not suitable96 Busbar Trip Lockout relay97 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 suitable150 Earth Fault Indicator

AFD Arc Flash Detector CLK Clock or Timing SourceDDR Dynamic Disturbance Recorder DFR Digital Fault Recorder ENV Environmental DataHIZ High Impedance Fault Detector HMI Human Machine InterfaceHST HistorianLGC Scheme LogicMET Substation MeteringPDC Phasor Data Concentrator PMU Phasor Measurement UnitPQM Power Quality Monitor RIO Remote Input/Output DeviceRTU Remote Terminal Unit/Data Concentrator

SER Sequence of Events Recorder TCM Trip Circuit Monitor SOTF Switch On To Fault

Suffixes and prefixes

SI Device Numbers - Wikipedia, the free encyclopedia

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