Cookie Policy Protection Relay Code / Short Name - ScadaTH
  • 21/21N = Distance Relay Phase &  Ground
  • 21BU = Backup Distance Relay
  • 24L = Overexcitation Relay (Overfluxing Relay)
  • 25 = Synchronizing Check Relay
  • 27 = Under Voltage
  • 27XR = Loss-of-DC Alarm Relay
  • 32 = Reverse Power
  • 33Q = Transformer Oil Level
  • 40 = Loss of Excitation.
  • 46 = Negative Phase Sequence Protection
  • 48 = Locked Rotor
  • 49 = Overload
  • 49W = Transformer Winding Temp
  • 49Q = Transformer Oil Temp
  • 50ARC = Instantaneous Overcurrent relay for Arc Protection System
  • 51G = Ground Fault Relay
  • 50/50N = Instantaneous Overcurrent Phase & Ground
  • 51/51N = IDMT. Overcurrent Phase & Ground
  • 59 = Over Voltage
  • 59N = Zero Sequence Overvoltage
  • 62PD = Pole Disagreement Protection.
  • 63D = Transformer Pressure Relief Device
  • 63TC = Transformer OLTC Protection Relay
  • 67/67N = Directional Overcurrent Relay / Directional Ground Overcurrent
  • 68 = Voltage Relay Block Closing Circuit While De-Energize
  • 79 = Auto Reclose Relay
  • 80T = Transformer Buchholz
  • 81 = Under Frequency Relay
  • 86 = Lockout Function
  • 87B = Bus Differential Relay
  • 87L = Line Current Differential Relay
  • 87T = Transformer Differential Protection Relay
  • 87REF = Differential Restricted Earth Fault Relay
  • 90 = Voltage Regulating Relay
  • 95B = CT Supervision Relay for 87B
  • BF = Circuit Breaker Failure Relay
  • Q = Power Factor Controller
  • R = Shunt Reactor
  • POTT = Permissive Overreaching Transfer Trip Function.

  • GIS = Gas Insulated Switchgear.
  • AIS = Air Insulated Switchgear.
  • LCU = Local Control Unit.
  • MCB = Miniature Circuit Breaker.

  • BDCS = Breaker Discrepancy Control Switches
  • DSDCS = Disconnect Switch Discrepancy Control Switch
  • SS = synchronizing Selector Switches
  • 79CO = Recloser Cut-off Switches
  • 87T-CO = Transformer Difference Cut-off Switches
  • 86B-CO = Bus Differential Auxiliary Tripping and Lockout Relay Cut-off Switches
  • 50BF-CO = Breaker Failure Cut-Off Switches
  • PB = Push Button Switches
  • 87L-CO = Line Current Differential Cut-Off Switches
  • 86DTT-CO = Direct Transfer Trip Cut-Off Switch
  • 43SC = Control Selector Switch
  • 85-C0 = Pilot Cut-Off Switch
  • PTT-CO = Permissive Transfer Trip Cut-Off switch.

  • IED = Intelligent Electronic Device
  • DPM = Digital Power Meter
  • DIM = Distributed I/O Module (for CSCS Control)
  • DAU = Data Acquisition Unit. (Computer)
  • BCU = Bay Control Unit
  • ODF = Optical Distribution frames.
  • DCS = Distributed Control and Monitoring System.
  • SCADA = Supervisory Control and Data acquisition.
  • FRS = Fault Recording System.
  • HMI = Human – Machine Interface.
  • LUI = Local User Interface.
  • CPM = Centre Processing Module.
  • SI = System Integrator
  • SA = Substation Automation
  • SAS = Substation Automation System
  • SCMS = Substation Control and Monitoring System
  • SCPS = Substation Control and Protection System
  • PLC = Programmable Logic Control (Device Part) or Power Line Carrier (Telecom Part)
  • OPGW = Optical Power Ground Wire (Telecom Part)
  • RMU = Ring Main Unit.
  • RCC = Remote Control Cubicle / Regional Control Center (SCADA)
  • LCC = Local Control Cubicle
  • NCC = National Control Center
  • BNCC = Backup National Control Center
  • NEC = North Eastern Area Control Center (for EGAT)
  • FFT = Fast Fourier Transform (for Math) / Full Function Test (for Testing Process)
  • FAT = Factory Acceptance Test (for Testing Process)
  • FRT = Factory Routine Test (for Testing Process)
  • SAT = Site Acceptance Test (for Testing Process)
  • ETE = End-To-End Test (for Testing Process)

  • AISC = American Institute of Steel Construction
  • ASCE = American Society of Civil Engineers
  • ANSI = American National Standards Institute
  • ASME = American Society of Mechanical Engineers
  • ASTM = American Society for Testing and Materials
  • AWS = American Welding Society
  • IEEE = Institute of Electrical and Electronics Engineers
  • NEMA = National Electrical Manufacturers Association
  • NFPA = National Fire Protection Association
  • TIS = Thai Industrial Standards
  • EIT = Engineering Institute of Thailand
Scroll to Top