شرح فارسی کد ANSI رله های حفاظتی پستها و خطوط فوق توزیع ANSI device numbers 1 - Master Element 2 - Time-delay Starting or Closing Relay 3 - Checking or Interlocking Relay 4 - Master Contactor 5 - Stopping Device 6 - Starting Circuit Breaker 7 - Rate of Change Relay 8 - Control Power Disconnecting Device 9 - Reversing Device 10 - Unit Sequence Switch 11 - Multifunction Device 12 - Overspeed Device/Protection 13 - Synchronous-Speed Device 14 - Underspeed Device 15 - Speed or Frequency Matching Device 16 - Communication Networking Device 17 - Shunting or Discharge Switch 18 - Accelerating or Decelerating Device 19 - Motor Starter / Starting-to-Running Transition Contactor 20 - Electrically-Operated Valve 21 - Distance Relay 21G - Ground Distance 21P - Phase Distance 22 – Equalizer circuit breaker 23 – Temperature control device 24 – Volts per hertz relay 25 – Synchronizing or synchronism-check device 26 – Apparatus thermal device 27 – Undervolta ...