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Let's learn some common abbreviations for transformers:
PT - Power Transformer
OLTC - On-Load Tap Changer
HV - High Voltage
LV - Low Voltage
MV - Medium Voltage
CT - Current Transformer
VT - Voltage Transformer
NTC - Neutral Temperature Rise
BIL - Basic Insulation Level
SC - Short Circuit
FL - Fluid (usually oil) Level
FLD - Fluid (oil) Density
FLDG - Fluid (oil) Degasification
TAP - Tap changer position
vector group - A notation describing the winding configuration and phase relationship between primary and secondary windings (e.g., Dyn11)
kVA - kilo-Volt-Ampere (unit of apparent power)
MVA - Mega-Volt-Ampere (unit of apparent power, larger scale than kVA)
kW - Kilowatt (unit of real power)
Hz - Hertz (unit of frequency)
°C - Degree Celsius (unit for temperature measurement)
OCR - Overcurrent Relay
Buchholz Relay - A protection device for transformers that detects gas accumulation caused by internal arcing or overheating.
GIS - Gas Insulated Switchgear (related to transformer installations in substations)
GIS - Grounding Impedance System (less common, relates to transformer earthing systems)
VCB - Vacuum Circuit Breaker (used in transformer circuit protection)
LTC - Load Tap Changer (alternative to OLTC, but often used interchangeably)
TTR - Turns Ratio Test (a test to verify transformer winding ratios)
PD - Partial Discharge (indicative of electrical discharge within insulation)
tan δ - Tangent Delta (a measure of dielectric loss in insulation materials)
IEEE - Institute of Electrical and Electronics Engineers (standard-setting body for electrical equipment including transformers)
