Directional Calculations

IDMTL Operating Time Calculation

Calculation:

1.00

A

NI

0.14

0.02

Current Setting Is

0.10

A

VI

13.5

1

Time Multiplier Tm

0.50

EI

80

2

NI

LTI

120

1

Fault Current

I

Curve K

0.14

α

0.02

Operating Time

Created By, N.Thiruvenkadam, Easun Reyrolle Ltd., Hosur

1.49

Sec.

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Over Current Relay Operating Angle for R, Y & B phase (Leadin Va^+Vb^+Vc^ = 0 Make : characteristic Angle : RΦ operating angle : 225 To 45 YΦ operating angle : 105 To 285 345 To 165 BΦ operating angle :

Earth Fault Current Relay Operating Angle for R, Y & B phase ( Va^+Vb^+Vc^ = 3Vo Make : Characteristic Angle : RΦ operating angle : 45 To 225 285 To 105 YΦ operating angle : 165 To 345 BΦ operating angle :





)

agging)





At 45 Deg











Transformer MVA Primary Voltage Secondary Voltage HV SIDE Primary Current Secondary Current Primary Voltage Secondary Voltage LV SIDE Primary Current Secondary Current % Imedance for Normal Tap Full load current in HV side Full load current in LV side HV CT Secondary Current LV CT Secondary Current ICT for HV Side ICT for LV Side ID>> ID> IR1 IR2 Diff Slope Diff. 2nd Har. Ratio Diff. 5th Har. Ratio

100 230 110 300 1 110 110 300 1 5.02% 251.022 524.864 0.837 1.750 1.195 0.572

MVA KV V A A KV V A A

15.9 0.2 0.8 8.0 0.2 0.2 0.3

A A A A

A A A A





Transformer MVA Primary Voltage Secondary Voltage Primary Current Secondary Current HV SIDE NCT Sec. Resistance Lead Resistance Total Resistance REF Relay Ct. setting Primary Voltage Secondary Voltage Primary Current Secondary Current LV SIDE NCT Sec. Resistance Lead Resistance Total Resistance REF Relay Ct. setting % Imedance for Normal Tap Full load current in HV side Full load current in LV side HV CT Secondary Current LV CT Secondary Current

Base MVA B V lt

20 33 110 1000 1 6.7 1 0 0.1 33 110 1000 1 6.7 1 0 0.1 10.80% 349.909 349.909 0.350 0.350

20 33

MVA KV V A A Ohms Ohms Ohms A KV V A A Ohms Ohms Ohms A A A A A

20 33





FAULT LOCATION:

Full Line length Line reactance Measure Reactance

15 KM 2.623 Ω 1.68 Ω

Fault Location

9.607 KM

Error calculation Texp Tact error%

40 30.9 -22.75

FAULT LOCATION =

Meas





re Reactance * Protection Full Line length Km Line reactance Ω

Directional Calculations

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