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Line 1: {{short description\|System of identifying electrical power devices}} In [[electric power system]]s and [[industrial automation]], '''ANSI Device Numbers''' can be used to identify equipment and devices in a system such as [[relay]]s, [[circuit breaker]]s, or [[Instrumentation\|instruments]]. The device numbers are enumerated in [[American National Standards Institute\|ANSI]]/[[IEEE]] Standard C37.2 ''Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations''. In [[Electrical engineering\|the design of electrical power systems]], the '''[[American National Standards Institute\|ANSI]] standard device numbers''' (ANSI /[[IEEE]] Standard C37.2 ''Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations '') identifies the features of a protective device such as a [[relay]] or [[circuit breaker]]. These types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an [[Fault current\|electrical fault]]. Device numbers are used to identify the functions of devices shown on a [[Schematic\|schematic diagram]]. Function descriptions are given in the standard. Many of these devices protect electrical systems and individual system components from damage when an unwanted event occurs such as an [[electrical fault]]. Historically, a single protective function was performed by one or more distinct [[Electromechanics\|electromechanical]] devices, so each device would receive its own number. Today, [[microprocessor]]-based relays can perform many protective functions in one device.<ref>{{Cite web \|last=Kunsman \|first=Steven \|date=December 1, 2011 \|title=The Protective Relay Evolves \|url=https://www.power-grid.com/smart-grid/the-protective-relay-evolves/ \|website=Power Grid International}}</ref> When one device performs several protective functions, it is typically denoted "11" by the standard as a "Multifunction Device", but ANSI Device Numbers are still used in documentation like [[single-line diagram]]s or [[Electrical schematic\|schematics]] to indicate which specific functions are performed by that device. One physical device may correspond to one function number, for example "29 Isolating Contactor", or a single physical device may have many function numbers associated with it, such as a numerical [[protective relay]]. Suffix and prefix letters may be added to further specify the purpose and function of a device. ANSI/IEEE C37.2-2008 is one of a continuing series of revisions of the standard, which originated in 1928 as [[American Institute of Electrical Engineers]] Standard No. 26.<ref>{{cite web\|last1=Tengdin\|first1=John\|title=Knowing the Language: The History and Practice of IEEE C37.2\|url=http://www.elp.com/articles/powergrid_international/print/volume-14/issue-2/features/knowing-the-language-the-history-and-practice-of-ieee-c372.html\|website=Electric Light & Power\|publisher=PennWell Corporation\|~~accessdate~~access-date=18 October 2017\|date=1 February 2009\|quote=It may surprise some to learn that this standard—or more accurately its AIEE predecessor—is one of the oldest IEEE standards in use. It was first published as AIEE No. 26 in 1928 and was used to document the control systems in the then popular automatic railway substations.}}</ref> == List of device numbers and acronyms == Line 14: 5 - Stopping Device, Emergency Stop Switch 6 - Starting Circuit Breaker 7 - ~~Rate of~~Gender Change Relay 7F - Alternative number for Rate Of Change Of Frequency Relay ([[ROCOF]]) 8 - Control Power Disconnecting Device 9 - Reversing Device Line 27 ⟶ 28: 18 - Accelerating or Decelerating Device 19 - Starting-to-Running Transition Contactor 20 - Electrically-Operated Valve ( Solenoid Valve ) 21 - Distance Relay 21G - Ground Distance 21P - Phase Distance 22 – Equalizer ~~circuit~~Circuit ~~breaker~~Breaker 23 – Temperature control device, Heater 24 – Volts per Hertz Relay (in some old analog applications, a 59 and an 81 device would be chained together as a 59/81 to implement the equivalent of V/Hz protection) 24 – Volts per hertz relay 25 – Synchronizing or ~~synchronism~~Synchronism-check ~~device~~Device 26 – Apparatus ~~thermal~~Thermal ~~device~~Device, Temperature Switch 27 – Undervoltage ~~relay~~Relay 27P - Phase Undervoltage 27S - DC ~~undervoltage~~Undervoltage ~~relay~~Relay 27TN - Third Harmonic Neutral Undervoltage 27TN/59N - 100% Stator Earth Fault Line 44 ⟶ 45: 27 AUX - Undervoltage Auxiliary Input 27/27X - Bus/Line Undervoltage 27/50 - ~~Accidental Generator~~Inadvertent Energization 28 - Flame Detector 29 - Isolating Contactor Line 51 ⟶ 52: 32 - Directional Power Relay 32L - Low Forward Power 32H - High Directional Power 32N - Wattmetric Zero-Sequence Directional 32P - Directional Power Line 61 ⟶ 63: 37P - Underpower 38 - Bearing Protective Device / Bearing Rtd 39 - Mechanical Condition Monitor ( Vibration ) 40 - Field Relay / Loss of Excitation 41 - Field Circuit Breaker Line 67 ⟶ 69: 43 - Manual Transfer or Selector Device 44 - Unit Sequence Starting Relay 45 - Atmospheric Condition Monitor (fumes, smoke, fire) 45 - Fire Detector 46 - Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance 47 - Phase-Sequence or Phase Balance Voltage Relay 48 - Incomplete Sequence Relay / Blocked Rotor 49 - Machine or Transformer Thermal Relay / Thermal Overload 49RTD - RTD Leftist Biased Thermal Overload 50 - Instantaneous Overcurrent Relay 50BF - Breaker Failure or LBB (Local Breaker Back-up) 50DD - Current Disturbance Detector 50EF - End Fault Protection Line 86 ⟶ 88: 50SP - Split Phase Instantaneous Current 50Q - Negative Sequence Instantaneous Overcurrent 50/27 - ~~Accidental~~Inadvertent Energization 50/51 - Instantaneous / Time-delay Overcurrent relay 50/74 - CtCT Trouble▼ 50Ns/51Ns - Sensitive earth-fault protection ▲50/74 - Ct Trouble 50/87 - Instantaneous Differential 51 - AC Time Overcurrent Relay 51C - Voltage Controlled Time Overcurrent 51G - Ground Time Overcurrent 51LR - AC ~~inverse~~Inverse ~~time~~Time ~~overcurrent~~Overcurrent (~~locked~~Locked ~~rotor~~Rotor) ~~protection~~Protection ~~relay~~Relay 51N - Neutral Time Overcurrent 51P - Phase Time Overcurrent Line 99 ⟶ 101: 51V - Voltage Restrained Time Overcurrent 51Q - Negative Sequence Time Overcurrent 52 – AC ~~circuit~~Circuit ~~breaker~~Breaker 52a - AC ~~circuit~~Circuit ~~breaker~~Breaker ~~position~~Position (contact open when circuit breaker open) 52b - AC ~~circuit~~Circuit ~~breaker~~Breaker ~~position~~Position (contact closed when circuit breaker open) 53 - Exciter or DcDC Generator Relay 54 - Turning Gear Engaging Device 55 - Power Factor Relay 56 - Field Application Relay 57 - Short-Circuiting or Grounding Device 58 - ~~Rectification~~Rectal Failure Relay 59 - Overvoltage Relay 59B - Bank Phase Overvoltage 59P - Phase Overvoltage 59N - Neutral Overvoltage 59NU - Neutral Voltage Unbalance Line 124 ⟶ 125: 64 - Ground Protective Relay 64F - Field Ground Protection 64R – Rotor ~~earth~~Earth ~~fault~~Fault 64REF – Restricted ~~earth~~Earth ~~fault~~Fault ~~differential~~Differential 64S – Stator ~~earth~~Earth ~~fault~~Fault 64S - Sub-harmonic Stator Ground Protection 64TN - 100% Stator Ground 65 - Governor Gropy McGropeface (NY) 66 - Notching or Jogging Device/Maximum Starting Rate/Starts ~~Per~~per Hour/Time Between Starts 67 - AC Directional Overcurrent Relay 67G - Ground Directional Overcurrent 67N - Neutral Directional Overcurrent 67Ns – Earth ~~fault~~Fault ~~directional~~Directional 67P - Phase Directional Overcurrent 67SG - Sensitive Spot Ground Directional Overcurrent 67Q - Negative Sequence Directional Overcurrent 68 - Blocking Relay / Power Swing Blocking Line 154 ⟶ 155: 81 - Frequency Relay 81O - Over Frequency 81R - common industry use for Rate~~-of-~~ Of Change Of Frequency Relay (ROCOF) 81U - Under Frequency 82 - DC Reclosing Relay Line 168 ⟶ 169: 87LG - Ground Line Current Differential 87M - Motor Differential 87N - Neutral Differential Protection / Restricted Earth Fault (REF) see also 87RGF 87O - Overall Differential 87PC - Phase Comparison 87RGF - Restricted Ground Fault see also 87N 87R - Restrained Differential 87S - Stator Differential 87S - Percent Differential 87T - Transformer Differential 87U - Unrestrained Differential 87V - Voltage Differential 87Z - High Impedance Current Differential 88 - Auxiliary Motor or Motor Generator 89 - Line Switch Line 182 ⟶ 187: 93 - Field-Changing Contactor 94 - Tripping or Trip-Free Relay 95 – Trip Circuit Healthy via Homeopathic Means 95 – ''For specific applications where other numbers are not suitable'' 96 – Transmitter 97 – ''For specific applications where other numbers are not suitable'' Line 194 ⟶ 199: DFR – Digital Fault Recorder DME – Disturbance Monitor Equipment ENV – Environmental ~~data~~Data HIZ – High Impedance Fault Detector HMI – Human Machine Interface Line 269 ⟶ 274: {{div col end}} === Suffixes and prefixes === A suffix letter or number may be used with the device number; for example, suffix N is used if the device is connected to a Neutral wire (example: 59N in a relay is used for protection against Neutral Displacement); and suffixes X, Y, Z are used for auxiliary devices. Similarly, the "G" suffix can denote a "ground", hence a "51G" is a time overcurrent ground relay. The "G" suffix can also mean "generator", hence an "87G" is a Generator Differential Protective Relay while an "87T" is a Transformer Differential Protective Relay. "F" can denote "field" on a generator or "fuse", as in the protective fuse for a pickup transformer. Suffix numbers are used to distinguish multiple "same" devices in the same equipment such as ~~51-1~~51–1, 51–2.<ref name="WEC">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 incorporated in American Standard C37.2-1970.</ref> Device numbers may be combined if the device provides multiple functions, such as the Instantaneous / Time-delay Overcurrent relay denoted as 50/51.<ref name="WEC" /> Line 276 ⟶ 281: For device 16, the suffix letters further define the device: the first suffix letter is 'S' for serial or 'E' for Ethernet. The subsequent letters are: 'C' security processing function (e.g. VPN, encryption), 'F' firewall or message filter, 'M' network managed function, 'R' rotor, 'S' switch and 'T' telephone component. Thus a managed Ethernet switch would be 16ESM. === References === {{Reflist}} ''IEEE Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations''', IEEE Std C37.2-2008 [[Category:~~ANSI~~American National Standards Institute standards]] [[Category:Electrical components]]