Transformer Differential Relay Test Report [PDF]

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Transformer Differential Relay (87T) Test Report Model : SIPROTEC 7UT612



Make: Siemens



Serial No: Location: CT Data: Location Transformer HV Bushing Transformer LV Bushing



Primary Current in A 300 900



Secondary Current in A 5 2.89



Power Transformer Data: Power Transformer Rating Rated Primary Current in 13.33 MVA Base Rated Secondary Current in 13.33 MVA Base Rated HV Voltage Rated LV Voltage Vector Group % Impedance



10/13.33 MVA 233.2 A 699.6 A 33 kV 11 kV Dyn11 11.33%



Physical Inspection: Visual Check for External Damage Condition of Front HMI Condition of Key Pad Condition of LED



Found OK Found OK Found OK Found OK



Measurement and Status Checks: Analog Input (CT Current) Checks Binary Input/Opto-Coupler Status Binary Output/Contact/Command Relay Front HMI LED



Found OK Found OK Found OK Found OK



LED Labels: LED Serial No 1 2 3 4 5 6 7



Signal Differential Trip HV Side Differential Trip LV Side External Trip External Trip General Over Current Trip Phase Over Current Trip 3I0 Trip (Residual O/C Trip)



Functions Configured in the Relay (Base on Function Availability): Serial No 1 2 3



Function Name Differential Function (87T) HV Phase O/C Function (51) HV Phase Residual O/C (51N)



Test of HV Differential Function: Phase R Y B



Set I/In 0.30 0.30 0.30



Operated at I 1.13 A 1.13 A 1.14 A



Delay 28 ms 28 ms 29 ms



Remark OK OK OK



Delay 29 ms 29 ms 29 ms



Remark OK OK OK



Test of LV Differential Function: Phase R Y B



Set I/In 0.30 0.30 0.30



Operated at I 0.63 A 0.64 A 0.63 A



Test of Phase O/C Function (DMT): Phase R Y B



Set I 4.0 A 4.0 A 4.0 A



Set t 500 ms 500 ms 500 ms



Operated at I 3.97 A 3.97 A 3.98 A



Delay 504 ms 503 ms 504 ms



Remark OK OK OK



Test of Residual O/C Function (DMT): Phase R Y B



Set I 1.5 A 1.5 A 1.5 A



Set t 400 ms 400 ms 400 ms



Operated at I 1.52 A 1.49 A 1.51 A



Delay 402 ms 403 ms 403 ms



Remark OK OK OK



Differential Stability Check: Found stable at load condition and external faults.



Tested by



Witnessed by