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Abu Ali asked Would you kindly indicate the international code for electrical protection relays, example 27= under volta?
And got the following answer:
I have a list. May be it is useful. 1. Master Element 2.Time delay starting or closing relay 3. Checking or interlocking relay 4. Master Contactor 5. Stopping Device 6.Starting CB 7. Anode CB 8. Control Power Disconnecting Device 9. Reversing Device 10.Unit Sequence Switch 11. Res. for furure application (FA) 12.Overspeed Device 13. Synchronous speed Device 14.Underspeed Device 15. Speed or frequency matching Device 16.FA 17. Shunting or Discharge sw. 18. Acc. or Dec. Device 19.Starting-to-running Trans. contactor 20.Elect. op. valve 21.Distance Relay 22.Equalizer CB 23.Temp. Con. Device 24.FA 25.Syn. ch.Dev. 26. App.Th.Dev. 27. Undervoltage relay 29.Isolating Contactor 30. Ann. relay 31.Sep. Ex. Dev. 32.Directional Power relay 33. Pos. sw. 34.Mot.-op. seq. sw. 35. Brush-operating or slip ring short circuiting device 36. polarity device 37. Undercurrent or under power relay 38. Bearing protective device 39. FA 40. Field relay 41. Field CB 42. Running CB 43. Manual transfer or Sel. Dev. 44. Unit Seq. start. rel.45.FA 46. Rev.ph.or ph.bal. relay 47. ph. seq. vol. relay 48. Incmplete seq. relay 49. Machine or transformer thermal relay 50. Instantaneous overcurrent or rate of rise relay. From 51 to 100 I will put some other time. SooryaShrestha (Electrical) 6 Mar 01 0:38 51. AC Ovrcurrent Rel. 52. AC CB 53. Ex. or DC Gen. Relay 54. High speed DC CB 55. Pfactor Relay 56. Field App. Relay 57. Shor-cicuiting Grounding Device 58. Power Rectifier Misfire Relay 59. Overvoltage Relay 60. Vol. Balance Relay 61.Current Balance Relay 62. Time delay stopping or opening relay 63. Liquid or Gas Pressure, level or flow relay 64. Ground Protection Relay 65. Governor 66. Notching or jogging device 67. AC Directional Overcurrent Relay 68. Blocking Relay 69. Permissive control device70.Electrically operated rheostat 71. FA 72. DC CB 73. Load resistor contactor 74. Alarm relay 75. Position changing mechanism 76. DC overcurrent relay 77. Pulse transmitter 78. Phase angle meas.or Out-of-step Prot. rel. 79. AC Reclosing relay 80. FA 81. Frequency Relay 82. DC Reclosing realy 83. Automatic Selective Control or transfer relay 84. Operating mechanism 85. Carrier or Pilot wire Receive relay 86. Lock out relay 87. Differencial relay 88. Auxiliary motor or motor generator 89. Line switch 90. Regulating device 91. Voltage directional relay 92.Voltage or power directional relay 93. Field changing contactor 94. Tripping or trip-free relay 95 to 99 specific application other than included above. There is also provision for the prefix RE for remote and suffix to device number for specific use. Yours: Grumpy