1. Transformer diffential protection
2. REF HV, REF LV
3. Dir O/C HV, LV , HVN, LVN (IOC, TOC) ,
4. O/C HV and LV Grounding
5. Mechanical Trip
a.BUZ relay Main Tank
b.BUZ relay OLTC
c. HV winding Temp High
d. LV winding Temp High
e. Main Tank PRD Opt
f. OLTC PRD Opt
g. Main tank oil Temp High
h. OLTC oil Temp High
6. O/C TW ( 51 TW-HS, 51 TW-LS)
